commit 58b379d6e3abe37dbe37be1b5e73a60ccd9c8473
Author: Антон Трошин <i@atroshin.ru>
Date:   Thu Jul 23 02:41:15 2026 +0300

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a8966d7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+dist/
+node_modules/
+static/data/
+.opencode/
+*.log
+.DS_Store
+Thumbs.db
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..54edda0
--- /dev/null
+++ b/index.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover" />
+  <meta name="theme-color" content="#1a1a2e" />
+  <meta name="description" content="Ponomar — Orthodox Church calendar and liturgical information" />
+  <link rel="icon" href="/icons/icon-192.png" />
+  <link rel="apple-touch-icon" href="/icons/icon-192.png" />
+  <link rel="manifest" href="/manifest.json" />
+  <link rel="preload" href="/fonts/Ponomar-Regular.woff" as="font" type="font/woff" crossorigin />
+  <title>Ponomar</title>
+</head>
+<body>
+  <div id="app"></div>
+  <script type="module" src="/src/main.ts"></script>
+</body>
+</html>
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..1068c7d
--- /dev/null
+++ b/package-lock.json
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..4f6a573
--- /dev/null
+++ b/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "ponomar-pwa",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "npm run convert && vite dev",
+    "build": "npm run convert && vite build",
+    "preview": "vite preview",
+    "convert": "tsx scripts/convert-all.ts",
+    "check": "svelte-kit sync 2>/dev/null; tsc --noEmit"
+  },
+  "devDependencies": {
+    "@tailwindcss/vite": "^4.3.3",
+    "fast-xml-parser": "^5.10.1",
+    "tailwindcss": "^4.3.3",
+    "tsx": "^4.23.1",
+    "typescript": "^6.0.3",
+    "vite": "^8.0.16"
+  }
+}
diff --git a/scripts/convert-all.ts b/scripts/convert-all.ts
new file mode 100644
index 0000000..84fe9f8
--- /dev/null
+++ b/scripts/convert-all.ts
@@ -0,0 +1,59 @@
+/**
+ * Master conversion script — converts all XML data to JSON at build time.
+ * Run with: tsx scripts/convert-all.ts
+ */
+
+import { convertCalendar } from './convert-calendar.ts';
+import { convertLives } from './convert-lives.ts';
+import { convertServices } from './convert-services.ts';
+import { convertBibleMeta } from './convert-bible-meta.ts';
+import { convertFasting } from './convert-fasting.ts';
+import { convertCommands } from './convert-commands.ts';
+import { convertServiceRules } from './convert-service-rules.ts';
+import { mkdirSync, existsSync, cpSync } from 'fs';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const SRC = join(__dirname, '..', '..', 'ponomar', 'Ponomar');
+const OUT = join(__dirname, '..', 'static', 'data');
+
+function ensureDir(dir: string) {
+  if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
+}
+
+async function main() {
+  const start = Date.now();
+  console.log('Converting Ponomar XML data to JSON...\n');
+
+  ensureDir(OUT);
+
+  // Copy font
+  const fontSrc = join(SRC, 'Ponomar-Regular.woff');
+  const fontDst = join(__dirname, '..', 'static', 'fonts', 'Ponomar-Regular.woff');
+  ensureDir(dirname(fontDst));
+  if (existsSync(fontSrc)) {
+    cpSync(fontSrc, fontDst);
+    console.log('Copied Ponomar font.');
+  }
+
+  // Convert all data in parallel
+  await Promise.all([
+    convertCalendar(SRC, OUT),
+    convertLives(SRC, OUT),
+    convertServices(SRC, OUT),
+    convertBibleMeta(SRC, OUT),
+    convertFasting(SRC, OUT),
+    convertCommands(SRC, OUT),
+    convertServiceRules(SRC, OUT),
+  ]);
+
+  const elapsed = ((Date.now() - start) / 1000).toFixed(1);
+  console.log(`\nAll conversions complete in ${elapsed}s.`);
+  console.log(`Output: ${OUT}`);
+}
+
+main().catch((err) => {
+  console.error('Conversion failed:', err);
+  process.exit(1);
+});
diff --git a/scripts/convert-bible-meta.ts b/scripts/convert-bible-meta.ts
new file mode 100644
index 0000000..695c416
--- /dev/null
+++ b/scripts/convert-bible-meta.ts
@@ -0,0 +1,146 @@
+/**
+ * Convert bible.xml to JSON metadata for all translations.
+ * Bible text .text files are copied as-is.
+ */
+
+import { readFileSync, writeFileSync, existsSync, mkdirSync, readdirSync, cpSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+});
+
+interface BibleBookMeta {
+  id: string;
+  name: string;
+  short: string;
+  chapters: number;
+  intro?: string;
+}
+
+interface BibleVersionMeta {
+  id: string;
+  name: string;
+  language: string;
+  books: BibleBookMeta[];
+}
+
+export async function convertBibleMeta(SRC: string, OUT: string) {
+  console.log('Converting Bible metadata...');
+
+  const bibleXml = join(SRC, 'languages', 'xml', 'bible.xml');
+  if (!existsSync(bibleXml)) {
+    console.log('  bible.xml not found, skipping');
+    return;
+  }
+
+  const data = parser.parse(readFileSync(bibleXml, 'utf-8'));
+  const versions: BibleVersionMeta[] = [];
+
+  // Root element is <BMLFILE>, <BIBLE> elements are children
+  const bml = data['BMLFILE'] || data;
+  const bibleNodes = bml['BIBLE'];
+  if (!bibleNodes) {
+    console.log('  No BIBLE elements found');
+    return;
+  }
+
+  const bibleArr = Array.isArray(bibleNodes) ? bibleNodes : [bibleNodes];
+
+  for (const bible of bibleArr) {
+    // fast-xml-parser with attributeNamePrefix '@_' puts attributes as flat keys
+    const id = bible['@_Id'] || bible['@_ID'] || '';
+    const name = bible['@_Name'] || '';
+
+    // Handle special case: Russian Bibles are under cu/ru/ in XML but should be ru/
+    const isRussianBible = id.startsWith('cu/ru/bible/');
+    const effectiveId = isRussianBible ? id.replace('cu/ru/', 'ru/') : id;
+    const effectiveLang = isRussianBible ? 'ru' : effectiveId.split('/')[0];
+
+    const version: BibleVersionMeta = {
+      id: effectiveId,
+      name,
+      language: effectiveLang,
+      books: [],
+    };
+
+    // Parse INFO attributes for display formatting
+    if (bible['INFO']) {
+      const infoObj = bible['INFO'] as Record<string, unknown>;
+      const formatting: Record<string, unknown> = {};
+      for (const [k, v] of Object.entries(infoObj)) {
+        if (k.startsWith('@_')) {
+          formatting[k.slice(2)] = v;
+        }
+      }
+      if (Object.keys(formatting).length > 0) {
+        (version as Record<string, unknown>).formatting = formatting;
+      }
+    }
+
+    // Parse books
+    if (bible['BOOK']) {
+      const bookArr = Array.isArray(bible['BOOK']) ? bible['BOOK'] : [bible['BOOK']];
+      for (const book of bookArr) {
+        const bookId = book['@_Id'] || book['@_ID'] || '';
+        const bookName = book['@_Name'] || '';
+        const bookShort = book['@_Short'] || book['@_Abbr'] || '';
+        const bookChapters = parseInt(book['@_Chapters'] || '0', 10);
+        const bookIntro = book['@_Intro'] || undefined;
+        const bookMeta: BibleBookMeta = {
+          id: bookId,
+          name: bookName,
+          short: bookShort,
+          chapters: bookChapters,
+        };
+        if (bookIntro) bookMeta.intro = bookIntro;
+        version.books.push(bookMeta);
+      }
+    }
+
+    versions.push(version);
+  }
+
+  // Write versions metadata
+  const outDir = join(OUT, 'bible');
+  mkdirSync(outDir, { recursive: true });
+  writeFileSync(join(outDir, 'versions.json'), JSON.stringify(versions, null, 2));
+  console.log(`  ${versions.length} Bible versions`);
+
+// Copy .text files for each version
+  for (const ver of versions) {
+    // Use the version's id directly (already normalized)
+    const idParts = ver.id.split('/');
+    const lang = idParts[0];
+    const subPath = idParts.slice(1).join('/'); // "bible/kjv"
+    const textSrc = join(SRC, 'languages', lang, subPath);
+
+    if (!existsSync(textSrc)) continue;
+
+    const textFiles = readdirSync(textSrc).filter(f => f.endsWith('.text'));
+    if (textFiles.length === 0) continue;
+
+    // Fix: Russian Bibles are under cu/ru/ in source but should go to ru/ in output
+    let outLang: string;
+    let outSubPath: string;
+    if (ver.id.startsWith('cu/ru/')) {
+      outLang = 'ru';
+      outSubPath = idParts.slice(2).join('/'); // Skip "cu/ru" → "bible/synod"
+    } else {
+      outLang = lang;
+      outSubPath = subPath;
+    }
+    const textDst = join(OUT, outLang, outSubPath);
+    mkdirSync(textDst, { recursive: true });
+
+    for (const f of textFiles) {
+      cpSync(join(textSrc, f), join(textDst, f));
+    }
+    console.log(`  ${ver.id}: ${textFiles.length} .text files copied to ${outLang}/`);
+  }
+}
diff --git a/scripts/convert-calendar.ts b/scripts/convert-calendar.ts
new file mode 100644
index 0000000..a713248
--- /dev/null
+++ b/scripts/convert-calendar.ts
@@ -0,0 +1,215 @@
+/**
+ * Convert calendar XML data (triodion, pentecostarion, menaion, commemorations) to JSON.
+ */
+
+import { readFileSync, writeFileSync, readdirSync, existsSync, mkdirSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+});
+
+function parseFile(path: string): Record<string, unknown> | null {
+  if (!existsSync(path)) return null;
+  const xml = readFileSync(path, 'utf-8');
+  try {
+    return parser.parse(xml);
+  } catch {
+    return null;
+  }
+}
+
+function extractDayData(data: Record<string, unknown> | null): unknown[] {
+  if (!data) return [];
+  const result: unknown[] = [];
+
+  // Handle <DAY><SAINT .../></DAY> structure (menaion per-language files)
+  if (data['DAY']) {
+    const day = data['DAY'];
+    if (typeof day === 'object' && day !== null) {
+      const saints = day['SAINT'];
+      if (saints) {
+        const saintArr = Array.isArray(saints) ? saints : [saints];
+        for (const saint of saintArr) {
+          if (typeof saint === 'object' && saint !== null) {
+            // fast-xml-parser puts attributes at top level with @_ prefix
+            const sId = saint['@_SId'] || saint['@_SID'] || '';
+            const cId = saint['@_CId'] || saint['@_CID'] || '';
+            if (cId) {
+              result.push({ SId: sId, CId: cId });
+            }
+          }
+        }
+      }
+    }
+  }
+
+  // Handle <LANGUAGE>...</LANGUAGE> structure (triodion/pentecostarion shared files)
+  if (data['LANGUAGE']) {
+    const lang = data['LANGUAGE'];
+    if (typeof lang === 'object' && lang !== null) {
+      for (const [key, value] of Object.entries(lang as Record<string, unknown>)) {
+        if (key === '@_attributes') continue;
+        if (typeof value === 'object' && value !== null) {
+          const attrs = (value as Record<string, unknown>)['@_attributes'] as Record<string, string> | undefined;
+          if (attrs && Object.keys(attrs).length > 0) {
+            result.push(attrs);
+          }
+        }
+      }
+    }
+  }
+
+  return result;
+}
+
+function convertCommemorationFile(data: Record<string, unknown>): Record<string, unknown> | null {
+  if (!data) return null;
+  const comm = data['COMMEMORATION'];
+  if (!comm || typeof comm !== 'object') return null;
+  const result: Record<string, unknown> = {};
+
+  function extractAttrs(obj: Record<string, unknown>): Record<string, unknown> {
+    const attrs: Record<string, unknown> = {};
+    for (const [k, v] of Object.entries(obj)) {
+      if (k.startsWith('@_')) {
+        attrs[k.slice(2)] = v; // strip @_ prefix
+      }
+    }
+    return attrs;
+  }
+
+  function processElement(obj: Record<string, unknown>): Record<string, unknown> {
+    const attrs = extractAttrs(obj);
+    const text = obj['#text'];
+    const out = { ...attrs };
+    if (typeof text === 'string' && text.trim()) {
+      out.text = text.trim();
+    }
+    return out;
+  }
+
+  for (const [key, value] of Object.entries(comm as Record<string, unknown>)) {
+    if (key.startsWith('@_')) continue; // skip root attributes
+    if (typeof value !== 'object' || value === null) continue;
+
+    if (Array.isArray(value)) {
+      result[key] = value.map(item => 
+        typeof item === 'object' && item !== null ? processElement(item as Record<string, unknown>) : item
+      );
+    } else if (typeof value === 'object') {
+      result[key] = processElement(value as Record<string, unknown>);
+    }
+  }
+
+  return Object.keys(result).length > 0 ? result : null;
+}
+
+export async function convertCalendar(SRC: string, OUT: string) {
+  console.log('Converting calendar data...');
+
+  // --- Triodion (shared, language-agnostic) ---
+  const triodionDir = join(SRC, 'languages', 'xml', 'triodion');
+  if (existsSync(triodionDir)) {
+    const outDir = join(OUT, 'shared', 'triodion');
+    mkdirSync(outDir, { recursive: true });
+    const files = readdirSync(triodionDir).filter(f => f.endsWith('.xml')).sort();
+    for (const file of files) {
+      const data = parseFile(join(triodionDir, file));
+      const dayData = extractDayData(data);
+      writeFileSync(join(outDir, file.replace('.xml', '.json')), JSON.stringify(dayData));
+    }
+    console.log(`  triodion: ${files.length} files`);
+  }
+
+  // --- Pentecostarion (shared, language-agnostic) ---
+  const pentecostarionDir = join(SRC, 'languages', 'xml', 'pentecostarion');
+  if (existsSync(pentecostarionDir)) {
+    const outDir = join(OUT, 'shared', 'pentecostarion');
+    mkdirSync(outDir, { recursive: true });
+    const files = readdirSync(pentecostarionDir).filter(f => f.endsWith('.xml')).sort();
+    for (const file of files) {
+      const data = parseFile(join(pentecostarionDir, file));
+      const dayData = extractDayData(data);
+      writeFileSync(join(outDir, file.replace('.xml', '.json')), JSON.stringify(dayData));
+    }
+    console.log(`  pentecostarion: ${files.length} files`);
+  }
+
+  // --- Commemorations (shared, indexed by CId) ---
+  const commBase = join(SRC, 'languages', 'xml', 'Commemorations');
+  if (existsSync(commBase)) {
+    const outDir = join(OUT, 'shared', 'commemorations');
+    mkdirSync(outDir, { recursive: true });
+    let count = 0;
+    const subdirs = readdirSync(commBase);
+    for (const sub of subdirs) {
+      const subDir = join(commBase, sub);
+      if (!existsSync(subDir)) continue;
+      const files = readdirSync(subDir).filter(f => f.endsWith('.xml'));
+      for (const file of files) {
+        const data = parseFile(join(subDir, file));
+        const commData = convertCommemorationFile(data);
+        if (commData) {
+          const cid = file.replace('.xml', '');
+          writeFileSync(join(outDir, `${cid}.json`), JSON.stringify(commData));
+          count++;
+        }
+      }
+    }
+    console.log(`  commemorations: ${count} files`);
+  }
+
+  // --- Menaion (per-language monthly day files) ---
+  const MENAION_SOURCES = [
+    { id: 'en', prefix: 'en' },
+    { id: 'cu', prefix: 'cu' },
+    { id: 'el', prefix: 'el' },
+    { id: 'fr', prefix: 'fr' },
+    { id: 'zh', prefix: 'zh' },
+  ];
+
+  for (const { id, prefix } of MENAION_SOURCES) {
+    const xmlDir = join(SRC, 'languages', prefix, 'xml');
+    if (!existsSync(xmlDir)) continue;
+
+    const outDir = join(OUT, id, 'menaion');
+    mkdirSync(outDir, { recursive: true });
+
+    let count = 0;
+    const months = readdirSync(xmlDir).filter(f => /^\d{2}$/.test(f));
+    for (const month of months) {
+      const monthDir = join(xmlDir, month);
+      if (!existsSync(monthDir)) continue;
+      const days = readdirSync(monthDir).filter(f => f.endsWith('.xml'));
+      for (const day of days) {
+        const data = parseFile(join(monthDir, day));
+        const dayData = extractDayData(data);
+        if (dayData) {
+          const mm = month;
+          const dd = day.replace('.xml', '');
+          writeFileSync(join(outDir, `${mm}-${dd}.json`), JSON.stringify(dayData));
+          count++;
+        }
+      }
+    }
+    console.log(`  ${id}: ${count} menaion day files`);
+
+    // Build menaion bundle (all days in one file for fast loading)
+    if (count > 0) {
+      const bundle: Record<string, unknown> = {};
+      const files = readdirSync(outDir).filter(f => f.endsWith('.json'));
+      for (const f of files) {
+        try {
+          bundle[f.replace('.json', '')] = JSON.parse(readFileSync(join(outDir, f), 'utf-8'));
+        } catch {}
+      }
+      writeFileSync(join(outDir, '..', 'menaion-bundle.json'), JSON.stringify(bundle));
+    }
+  }
+}
diff --git a/scripts/convert-commands.ts b/scripts/convert-commands.ts
new file mode 100644
index 0000000..f9e871c
--- /dev/null
+++ b/scripts/convert-commands.ts
@@ -0,0 +1,59 @@
+/**
+ * Convert command XML files to JSON.
+ * Handles both per-language (en/xml/Commands/, cu/xml/Commands/)
+ * and shared (xml/Commands/).
+ */
+
+import { readFileSync, writeFileSync, existsSync, mkdirSync, readdirSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+});
+
+function convertCmdDir(srcDir: string, outDir: string): number {
+  if (!existsSync(srcDir)) return 0;
+  mkdirSync(outDir, { recursive: true });
+  const files = readdirSync(srcDir).filter(f => f.endsWith('.xml'));
+  for (const file of files) {
+    const data = parser.parse(readFileSync(join(srcDir, file), 'utf-8'));
+    const outName = file.replace('.xml', '.json');
+    writeFileSync(join(outDir, outName), JSON.stringify(data, null, 2));
+  }
+  return files.length;
+}
+
+export async function convertCommands(SRC: string, OUT: string) {
+  console.log('Converting command files...');
+
+  // Shared commands (Fasting.xml, ServiceRules.xml, DivineLiturgy.xml, ScriptureTransfers.xml)
+  const sharedCmdDir = join(SRC, 'languages', 'xml', 'Commands');
+  const sharedOut = join(OUT, 'shared', 'commands');
+  const sharedCount = convertCmdDir(sharedCmdDir, sharedOut);
+  console.log(`  shared: ${sharedCount} command files`);
+
+  // Per-language commands (Times.xml, Podobni.xml, LanguagePacks.xml, etc.)
+  const CMD_SOURCES = [
+    { id: 'en', prefix: 'en' },
+    { id: 'cu', prefix: 'cu' },
+    { id: 'ru', prefix: 'cu/ru' },
+    { id: 'el', prefix: 'el' },
+    { id: 'el/mono', prefix: 'el/mono' },
+    { id: 'fr', prefix: 'fr' },
+    { id: 'zh/Hans', prefix: 'zh/Hans' },
+    { id: 'zh/Hant', prefix: 'zh/Hant' },
+    { id: 'zh', prefix: 'zh' },
+  ];
+
+  for (const { id, prefix } of CMD_SOURCES) {
+    const cmdDir = join(SRC, 'languages', prefix, 'xml', 'Commands');
+    const outDir = join(OUT, id, 'commands');
+    const count = convertCmdDir(cmdDir, outDir);
+    if (count > 0) console.log(`  ${id}: ${count} command files`);
+  }
+}
diff --git a/scripts/convert-fasting.ts b/scripts/convert-fasting.ts
new file mode 100644
index 0000000..fe8aa62
--- /dev/null
+++ b/scripts/convert-fasting.ts
@@ -0,0 +1,61 @@
+/**
+ * Convert Fasting.xml to JSON.
+ * Fasting.xml is shared at languages/xml/Commands/Fasting.xml
+ */
+
+import { readFileSync, writeFileSync, existsSync, mkdirSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+});
+
+export async function convertFasting(SRC: string, OUT: string) {
+  console.log('Converting Fasting.xml...');
+
+  const filePath = join(SRC, 'languages', 'xml', 'Commands', 'Fasting.xml');
+  if (!existsSync(filePath)) {
+    console.log('  Fasting.xml not found, skipping');
+    return;
+  }
+
+  const data = parser.parse(readFileSync(filePath, 'utf-8'));
+  const periods: { cmd: string; rules: { case: string; cmd: string }[] }[] = [];
+
+  if (data['FASTING']) {
+    const fasting = data['FASTING'];
+    const periodArr = Array.isArray(fasting['PERIOD']) ? fasting['PERIOD'] : [fasting['PERIOD']];
+
+    for (const period of periodArr) {
+      if (!period) continue;
+      const periodCmd = period['@_Cmd'] || '';
+      const rules: { case: string; cmd: string }[] = [];
+
+      if (period['RULE']) {
+        const ruleArr = Array.isArray(period['RULE']) ? period['RULE'] : [period['RULE']];
+        for (const rule of ruleArr) {
+          if (!rule) continue;
+          rules.push({
+            case: rule['@_Case'] || '1111111',
+            cmd: rule['@_Cmd'] || '',
+          });
+        }
+      }
+
+      periods.push({
+        cmd: periodCmd,
+        rules,
+      });
+    }
+  }
+
+  const outDir = join(OUT, 'shared');
+  mkdirSync(outDir, { recursive: true });
+  writeFileSync(join(outDir, 'fasting.json'), JSON.stringify(periods, null, 2));
+  console.log(`  ${periods.length} fasting periods`);
+}
diff --git a/scripts/convert-lives.ts b/scripts/convert-lives.ts
new file mode 100644
index 0000000..f081687
--- /dev/null
+++ b/scripts/convert-lives.ts
@@ -0,0 +1,261 @@
+/**
+ * Convert saint lives XML to JSON.
+ * Lives are per-language: languages/{lang}/xml/lives/
+ */
+
+import { readFileSync, writeFileSync, readdirSync, existsSync, mkdirSync, rmSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+});
+
+function parseFile(path: string): Record<string, unknown> | null {
+  if (!existsSync(path)) return null;
+  const xml = readFileSync(path, 'utf-8');
+  try {
+    return parser.parse(xml);
+  } catch {
+    return null;
+  }
+}
+
+function extractAttrs(obj: Record<string, unknown>): Record<string, unknown> {
+  const attrs: Record<string, unknown> = {};
+  for (const [k, v] of Object.entries(obj)) {
+    if (k.startsWith('@_')) {
+      attrs[k.slice(2)] = v;
+    }
+  }
+  return attrs;
+}
+
+function simplifySaintData(data: Record<string, unknown>): Record<string, unknown> | null {
+  if (!data) return null;
+  const result: Record<string, unknown> = {};
+
+  for (const [key, value] of Object.entries(data)) {
+    if (key === '@_attributes') continue;
+    if (typeof value !== 'object' || value === null) continue;
+
+    const attrs = (value as Record<string, unknown>)['@_attributes'] as Record<string, string> | undefined;
+    const k = key.toUpperCase();
+
+    if (k === 'GRAMMAR') {
+      const grammar: Record<string, string> = {};
+      for (const [gKey, gValue] of Object.entries(value as Record<string, unknown>)) {
+        if (gKey === '@_attributes') continue;
+        if (typeof gValue === 'string') grammar[gKey] = gValue;
+        else if (typeof gValue === 'object' && gValue !== null) {
+          const inner = (gValue as Record<string, unknown>)['#text'];
+          if (typeof inner === 'string') grammar[gKey] = inner;
+        }
+      }
+      result.grammar = grammar;
+    } else if (k === 'NAME') {
+      const nameObj: Record<string, string> = {};
+      const nameItems = Array.isArray(value) ? value : [value];
+      for (const nameItem of nameItems) {
+        if (typeof nameItem === 'object' && nameItem !== null) {
+          for (const [nKey, nValue] of Object.entries(nameItem as Record<string, unknown>)) {
+            if (nKey === '@_attributes') continue;
+            if (typeof nValue === 'string') nameObj[nKey] = nValue;
+          }
+        }
+      }
+      result.name = nameObj;
+    } else if (k === 'LIFE') {
+      const text = (value as Record<string, unknown>)['#text'];
+      const lifeAttrs = extractAttrs(value as Record<string, unknown>);
+      result.life = {
+        id: lifeAttrs.ID as string || '',
+        copyright: lifeAttrs.Copyright as string || '',
+        text: typeof text === 'string' ? text : '',
+      };
+    } else if (k === 'RANK') {
+      const rankAttrs = extractAttrs(value as Record<string, unknown>);
+      result.rank = parseInt(rankAttrs.ID as string || '0', 10);
+    } else if (k === 'SERVICE') {
+      const services: Record<string, Record<string, Record<string, unknown>>> = {};
+      const scriptures: { type?: string; reading?: string; pericope?: string; cmd?: string }[] = [];
+
+      // Extract rank from SERVICE Type attribute (handles both single and array)
+      const svcItems = Array.isArray(value) ? value : [value];
+      for (const svcItem of svcItems) {
+        const svcType = (svcItem as Record<string, unknown>)['@_Type'];
+        if (svcType) {
+          const t = parseInt(svcType as string, 10);
+          if (!isNaN(t) && t > (result.rank || 0)) {
+            result.rank = t;
+          }
+        }
+      }
+      
+      function extractScriptures(obj: Record<string, unknown>): void {
+        for (const [sk, sv] of Object.entries(obj)) {
+          if (sk === 'SCRIPTURE' && sv) {
+            const svArr = Array.isArray(sv) ? sv : [sv];
+            for (const item of svArr) {
+              if (typeof item === 'object' && item !== null) {
+                const attrs = extractAttrs(item as Record<string, unknown>);
+                if (Object.keys(attrs).length > 0) {
+                  scriptures.push(attrs);
+                }
+              }
+            }
+          } else if (typeof sv === 'object' && sv !== null) {
+            extractScriptures(sv as Record<string, unknown>);
+          }
+        }
+      }
+
+      // Recursively extract nested service elements into {group/{element/Type}: {attrs+text}}
+      function extractServiceGroup(obj: Record<string, unknown>): Record<string, Record<string, unknown>> {
+        const group: Record<string, Record<string, unknown>> = {};
+        for (const [gk, gv] of Object.entries(obj)) {
+          if (gk === '@_attributes' || gk === '#text') continue;
+          if (typeof gv !== 'object' || gv === null) continue;
+          const gArr = Array.isArray(gv) ? gv : [gv];
+          for (const item of gArr) {
+            if (typeof item !== 'object' || item === null) continue;
+            const attrs = extractAttrs(item as Record<string, unknown>);
+            const text = (item as Record<string, unknown>)['#text'];
+            const type = attrs.Type as string || '0';
+            const key = `${gk}/${type}`;
+            group[key] = { text: typeof text === 'string' ? text : '', ...attrs };
+          }
+        }
+        return group;
+      }
+
+      for (const [sKey, sValue] of Object.entries(value as Record<string, unknown>)) {
+        if (sKey === '@_attributes') continue;
+        if (typeof sValue === 'object' && sValue !== null) {
+          const sObj = sValue as Record<string, unknown>;
+          const sAttrs = sObj['@_attributes'] as Record<string, string> | undefined;
+          const sText = sObj['#text'];
+
+          // Check if this element has nested children (e.g., ROYALHOURS contains IDIOMEL, VERSE, etc.)
+          const childKeys = Object.keys(sObj).filter(k => k !== '@_attributes' && k !== '#text');
+          if (childKeys.length > 0) {
+            // Has nested elements — extract recursively
+            services[sKey] = extractServiceGroup(sObj);
+          } else {
+            // Leaf element — store directly
+            services[sKey] = { text: typeof sText === 'string' ? sText : '', ...(sAttrs || {}) };
+          }
+          
+          // Extract scriptures from this service (recursively)
+          extractScriptures(sValue as Record<string, unknown>);
+        }
+      }
+      if (Object.keys(services).length > 0) result.services = services;
+      if (scriptures.length > 0) result.scripture = scriptures;
+    } else if (k === 'ICON') {
+      const iconAttrs = extractAttrs(value as Record<string, unknown>);
+      result.icon = iconAttrs.ID as string || '';
+    } else if (k === 'SCRIPTURE') {
+      const scriptures: Record<string, unknown>[] = [];
+      const scriptureArr = Array.isArray(value) ? value : [value];
+      for (const s of scriptureArr) {
+        if (typeof s === 'object' && s !== null) {
+          const attrs = extractAttrs(s as Record<string, unknown>);
+          if (Object.keys(attrs).length > 0) {
+            scriptures.push(attrs);
+          }
+        }
+      }
+      if (scriptures.length > 0) {
+        result.scripture = scriptures;
+      }
+    }
+  }
+
+  return Object.keys(result).length > 0 ? result : null;
+}
+
+export async function convertLives(SRC: string, OUT: string) {
+  console.log('Converting saint lives...');
+
+  const LANG_CONFIGS = [
+    { id: 'en', prefix: 'en' },
+    { id: 'cu', prefix: 'cu' },
+    { id: 'ru', prefix: 'cu/ru' },
+    { id: 'el', prefix: 'el' },
+    { id: 'el/mono', prefix: 'el/mono' },
+    { id: 'fr', prefix: 'fr' },
+    { id: 'zh/Hans', prefix: 'zh/Hans' },
+    { id: 'zh/Hant', prefix: 'zh/Hant' },
+    { id: 'shared', prefix: '' },
+  ];
+
+  for (const { id, prefix } of LANG_CONFIGS) {
+    const livesDir = join(SRC, 'languages', prefix, 'xml', 'lives');
+    if (!existsSync(livesDir)) continue;
+
+    const outDir = join(OUT, id, 'lives');
+    mkdirSync(outDir, { recursive: true });
+    // Clean old individual files from previous conversions
+    for (const oldFile of readdirSync(outDir).filter(f => f.endsWith('.json'))) {
+      rmSync(join(outDir, oldFile), { force: true });
+    }
+
+    let count = 0;
+    const files = readdirSync(livesDir).filter(f => f.endsWith('.xml'));
+    const bundles: Record<string, Record<string, Record<string, unknown>>> = {};
+
+    for (const file of files) {
+      const data = parseFile(join(livesDir, file));
+      if (!data) continue;
+
+      let saintData: Record<string, unknown> | null = null;
+      for (const [key, value] of Object.entries(data)) {
+        if (typeof value === 'object' && value !== null && key !== '@_attributes') {
+          saintData = simplifySaintData(value as Record<string, unknown>);
+          break;
+        }
+      }
+
+      if (saintData) {
+        const cid = file.replace('.xml', '');
+        const mm = cid.match(/^(0[1-9]|1[0-2])\d+/)?.[1];
+        const bundleName = mm ? `${mm}.json` : 'misc.json';
+        if (!bundles[bundleName]) bundles[bundleName] = {};
+        bundles[bundleName][cid] = saintData;
+        count++;
+      }
+    }
+
+    // Write bundles
+    for (const [bundleName, bundle] of Object.entries(bundles)) {
+      writeFileSync(join(outDir, bundleName), JSON.stringify(bundle));
+    }
+
+    console.log(`  ${id}: ${count} saint lives in ${Object.keys(bundles).length} bundles`);
+  }
+
+  // Build shared lives index (CId → scripture for fast lookup)
+  const sharedOut = join(OUT, 'shared', 'lives');
+  const index: Record<string, unknown[]> = {};
+  if (existsSync(sharedOut)) {
+    const files = readdirSync(sharedOut).filter(f => f.endsWith('.json'));
+    for (const f of files) {
+      if (f === 'lives-index.json') continue;
+      try {
+        const bundle = JSON.parse(readFileSync(join(sharedOut, f), 'utf-8'));
+        for (const [cid, data] of Object.entries(bundle as Record<string, Record<string, unknown>>)) {
+          if (data.scripture) {
+            index[cid] = data.scripture;
+          }
+        }
+      } catch {}
+    }
+  }
+  writeFileSync(join(sharedOut, '..', 'lives-index.json'), JSON.stringify(index));
+  console.log(`  lives-index: ${Object.keys(index).length} entries`);
+}
diff --git a/scripts/convert-service-rules.ts b/scripts/convert-service-rules.ts
new file mode 100644
index 0000000..6d92461
--- /dev/null
+++ b/scripts/convert-service-rules.ts
@@ -0,0 +1,71 @@
+/**
+ * Convert ServiceRules.xml to JSON.
+ * ServiceRules.xml is shared at languages/xml/Commands/ServiceRules.xml
+ */
+
+import { readFileSync, writeFileSync, existsSync, mkdirSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+});
+
+export async function convertServiceRules(SRC: string, OUT: string) {
+  console.log('Converting ServiceRules.xml...');
+
+  const filePath = join(SRC, 'languages', 'xml', 'Commands', 'ServiceRules.xml');
+  if (!existsSync(filePath)) {
+    console.log('  ServiceRules.xml not found, skipping');
+    return;
+  }
+
+  const data = parser.parse(readFileSync(filePath, 'utf-8'));
+  const periods: { cmd: string; rules: Record<string, string>[] }[] = [];
+
+  const root = data['DATA'] || data['SERVICES'];
+  if (root) {
+    const periodArr = Array.isArray(root['PERIOD']) ? root['PERIOD'] : [root['PERIOD']];
+
+    for (const period of periodArr) {
+      if (!period) continue;
+      const periodCmd = root['@_Cmd'] || period['@_Cmd'] || '';
+      const rules: Record<string, string>[] = [];
+
+      for (const [key, value] of Object.entries(period)) {
+        if (key.startsWith('@_')) continue;
+        if (typeof value === 'object' && value !== null) {
+          const ruleArr = Array.isArray(value) ? value : [value];
+          for (const rule of ruleArr) {
+            if (typeof rule === 'object' && rule !== null) {
+              // Collect all @_-prefixed attributes (flat format)
+              const attrs: Record<string, string> = {};
+              for (const [rKey, rValue] of Object.entries(rule as Record<string, unknown>)) {
+                if (rKey.startsWith('@_') && typeof rValue === 'string') {
+                  attrs[rKey.slice(2)] = rValue;
+                }
+              }
+              if (Object.keys(attrs).length > 0) {
+                rules.push({ type: key, ...attrs });
+              }
+            }
+          }
+        }
+      }
+
+      periods.push({
+        cmd: periodCmd,
+        rules,
+      });
+    }
+  }
+
+  const outDir = join(OUT, 'shared');
+  mkdirSync(outDir, { recursive: true });
+  writeFileSync(join(outDir, 'service-rules.json'), JSON.stringify(periods, null, 2));
+  console.log(`  ${periods.length} service rule periods`);
+}
diff --git a/scripts/convert-services.ts b/scripts/convert-services.ts
new file mode 100644
index 0000000..1326fa1
--- /dev/null
+++ b/scripts/convert-services.ts
@@ -0,0 +1,199 @@
+/**
+ * Convert service template XML to JSON.
+ * Recursively converts all subdirectories under Services/.
+ * Unwraps COMMONPRAYER root wrappers, flattens children, lowercases attributes.
+ */
+
+import { readFileSync, writeFileSync, readdirSync, existsSync, mkdirSync } from 'fs';
+import { join } from 'path';
+import { XMLParser } from 'fast-xml-parser';
+
+const parser = new XMLParser({
+  ignoreAttributes: false,
+  attributeNamePrefix: '@_',
+  allowBooleanAttributes: true,
+  parseTagValue: false,
+  trimValues: true,
+  preserveOrder: true,
+});
+
+function parseFile(path: string): unknown[] | null {
+  if (!existsSync(path)) return null;
+  const xml = readFileSync(path, 'utf-8');
+  try {
+    return parser.parse(xml) as unknown[];
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Lowercase all @_-prefixed attribute keys and strip the prefix.
+ * e.g. { '@_Value': 'Wisdom.', '@_Who': 'Deacon' } → { value: 'Wisdom.', who: 'Deacon' }
+ */
+function lowerAttrs(obj: Record<string, unknown>): Record<string, unknown> {
+  const result: Record<string, unknown> = {};
+  for (const [key, value] of Object.entries(obj)) {
+    if (key.startsWith('@_')) {
+      result[key.slice(2).toLowerCase()] = value;
+    } else {
+      result[key] = value;
+    }
+  }
+  return result;
+}
+
+/**
+ * Convert a parsed XML node (preserveOrder format) into a flat array of service nodes.
+ * Input is an array of ordered entries, each: { tagName: children[], ":@": { attrs } }
+ */
+function convertNodes(data: unknown[]): unknown[] {
+  const result: unknown[] = [];
+
+  for (const entry of data as Record<string, unknown>[]) {
+    // Get the tag name (first key that isn't ':@')
+    const tagName = Object.keys(entry).find(k => k !== ':@');
+    if (!tagName) continue;
+
+    const attrs = (entry[':@'] ?? {}) as Record<string, unknown>;
+    const children = (entry[tagName] ?? []) as unknown[];
+
+    // Unwrap wrapper elements (COMMONPRAYER, SERVICES, SERVICE)
+    if (tagName === 'COMMONPRAYER' || tagName === 'SERVICE' || tagName === 'SERVICES') {
+      result.push(...convertNodes(children));
+      continue;
+    }
+
+    // Convert element with its attributes
+    const node = convertNodeItem(tagName, attrs, children);
+    if (node) result.push(node);
+  }
+
+  return result;
+}
+
+/**
+ * Convert a single XML element into a service node object.
+ */
+function convertNodeItem(
+  tagName: string,
+  attrs: Record<string, unknown>,
+  children: unknown[]
+): Record<string, unknown> | null {
+  const lowercased = lowerAttrs(attrs);
+
+  // Convert boolean attribute values: "1"→true, "0"→false
+  const boolKeys = ['redfirst', 'newline', 'header', 'null', 'withmen'];
+  for (const k of boolKeys) {
+    if (lowercased[k] === '1') lowercased[k] = true;
+    else if (lowercased[k] === '0') lowercased[k] = false;
+  }
+  // Convert numeric attribute values: "3"→3
+  const numKeys = ['times'];
+  for (const k of numKeys) {
+    if (typeof lowercased[k] === 'string' && /^\d+$/.test(lowercased[k])) {
+      lowercased[k] = parseInt(lowercased[k], 10);
+    }
+  }
+  const node: Record<string, unknown> = { type: tagName };
+
+  // Copy all attributes as lowercase keys
+  for (const [key, value] of Object.entries(lowercased)) {
+    if (key === 'type') continue;
+    node[key] = value;
+  }
+
+  // Process child elements recursively
+  if (children.length > 0) {
+    // Check for #text content
+    const textNode = children.find(c => (c as Record<string, unknown>)['#text']);
+    if (textNode) {
+      node.text = (textNode as Record<string, unknown>)['#text'] as string;
+    } else {
+      const childNodes = convertNodes(children);
+      if (childNodes.length > 0) {
+        node._children = childNodes;
+      }
+    }
+  }
+
+  return node;
+}
+
+function convertDirRecursive(srcDir: string, outDir: string): number {
+  let count = 0;
+  mkdirSync(outDir, { recursive: true });
+
+  const entries = readdirSync(srcDir);
+  for (const entry of entries) {
+    if (entry.startsWith('.')) continue;
+    const srcPath = join(srcDir, entry);
+
+    if (!existsSync(srcPath)) continue;
+
+    if (entry.endsWith('.xml')) {
+      const data = parseFile(srcPath);
+      if (!data) continue;
+
+      // Convert and flatten
+      const nodes = flattenNodes(convertNodes(data));
+      const outName = entry.replace('.xml', '.json');
+      writeFileSync(join(outDir, outName), JSON.stringify(nodes));
+      count++;
+    } else {
+      // Subdirectory (e.g. "Tone 1", "KONTAKION", "TROPARION")
+      const subOut = join(outDir, entry);
+      count += convertDirRecursive(srcPath, subOut);
+    }
+  }
+
+  return count;
+}
+
+/**
+ * Flatten nodes that have _children into a single flat array.
+ */
+function flattenNodes(nodes: unknown[]): unknown[] {
+  const result: unknown[] = [];
+  for (const node of nodes) {
+    if (typeof node !== 'object' || node === null) {
+      result.push(node);
+      continue;
+    }
+    const n = node as Record<string, unknown>;
+    if (n._children && Array.isArray(n._children)) {
+      // This node has children — push the node itself (without _children) then flatten children
+      const { _children, ...rest } = n;
+      result.push(rest);
+      result.push(...flattenNodes(_children));
+    } else {
+      result.push(n);
+    }
+  }
+  return result;
+}
+
+export async function convertServices(SRC: string, OUT: string) {
+  console.log('Converting service templates...');
+
+  const SERVICE_SOURCES = [
+    { id: 'en', prefix: 'en' },
+    { id: 'cu', prefix: 'cu' },
+    { id: 'ru', prefix: 'cu/ru' },
+    { id: 'el', prefix: 'el' },
+    { id: 'fr', prefix: 'fr' },
+    { id: 'zh/Hans', prefix: 'zh/Hans' },
+    { id: 'zh/Hant', prefix: 'zh/Hant' },
+    { id: 'zh', prefix: 'zh' },
+    { id: 'shared', prefix: '' },
+  ];
+
+  for (const { id, prefix } of SERVICE_SOURCES) {
+    const servicesDir = join(SRC, 'languages', prefix, 'xml', 'Services');
+    if (!existsSync(servicesDir)) continue;
+
+    const outDir = join(OUT, id, 'services');
+    const count = convertDirRecursive(servicesDir, outDir);
+    console.log(`  ${id}: ${count} service files`);
+  }
+}
diff --git a/scripts/generate-icons.js b/scripts/generate-icons.js
new file mode 100644
index 0000000..5708b2c
--- /dev/null
+++ b/scripts/generate-icons.js
@@ -0,0 +1,84 @@
+import { writeFileSync, mkdirSync } from 'fs';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+import zlib from 'zlib';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const iconsDir = join(__dirname, '..', 'static', 'icons');
+mkdirSync(iconsDir, { recursive: true });
+
+function crc32(buf) {
+  let crc = 0xffffffff;
+  for (let i = 0; i < buf.length; i++) {
+    crc ^= buf[i];
+    for (let j = 0; j < 8; j++) {
+      crc = (crc >>> 1) ^ (crc & 1 ? 0xedb88320 : 0);
+    }
+  }
+  return (crc ^ 0xffffffff) >>> 0;
+}
+
+function createChunk(type, data) {
+  const typeBytes = Buffer.from(type, 'ascii');
+  const len = Buffer.alloc(4);
+  len.writeUInt32BE(data.length);
+  const body = Buffer.concat([typeBytes, data]);
+  const crc = Buffer.alloc(4);
+  crc.writeUInt32BE(crc32(body));
+  return Buffer.concat([len, body, crc]);
+}
+
+function generatePNG(size) {
+  const bg = [0x1a, 0x1a, 0x2e];
+  const gold = [0xc5, 0xa5, 0x5a];
+
+  const pixels = [];
+  for (let y = 0; y < size; y++) {
+    pixels.push(0);
+    for (let x = 0; x < size; x++) {
+      if (isCross(x, y, size)) {
+        pixels.push(...gold);
+      } else {
+        pixels.push(...bg);
+      }
+    }
+  }
+
+  const raw = Buffer.from(pixels);
+  const compressed = zlib.deflateSync(raw);
+
+  const ihdr = Buffer.alloc(13);
+  ihdr.writeUInt32BE(size, 0);
+  ihdr.writeUInt32BE(size, 4);
+  ihdr[8] = 8;
+  ihdr[9] = 2;
+  ihdr[10] = 0;
+  ihdr[11] = 0;
+  ihdr[12] = 0;
+
+  const signature = Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]);
+
+  return Buffer.concat([
+    signature,
+    createChunk('IHDR', ihdr),
+    createChunk('IDAT', compressed),
+    createChunk('IEND', Buffer.alloc(0)),
+  ]);
+}
+
+function isCross(x, y, size) {
+  const cx = Math.floor(size / 2);
+  const cy = Math.floor(size / 2);
+  const arm = Math.max(2, Math.floor(size * 0.06));
+  const halfLen = Math.floor(size * 0.32);
+  const topLen = Math.floor(size * 0.38);
+
+  const inVert = Math.abs(x - cx) <= arm && y >= cy - topLen && y <= cy + halfLen;
+  const inHoriz = Math.abs(y - cy) <= arm && x >= cx - halfLen && x <= cx + halfLen;
+
+  return inVert || inHoriz;
+}
+
+writeFileSync(join(iconsDir, 'icon-192.png'), generatePNG(192));
+writeFileSync(join(iconsDir, 'icon-512.png'), generatePNG(512));
+console.log('Icons generated.');
diff --git a/scripts/generate-icons.py b/scripts/generate-icons.py
new file mode 100644
index 0000000..9a66c70
--- /dev/null
+++ b/scripts/generate-icons.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+"""Generate PWA icons from OrthodoxCross.svg using rsvg-convert + Pillow."""
+
+import os
+import subprocess
+import tempfile
+from PIL import Image
+
+SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
+PROJECT_DIR = os.path.join(SCRIPT_DIR, '..')
+SVG_PATH = os.path.join(PROJECT_DIR, 'static', 'OrthodoxCross.svg')
+ICONS_DIR = os.path.join(PROJECT_DIR, 'static', 'icons')
+os.makedirs(ICONS_DIR, exist_ok=True)
+
+GOLD = (0xC5, 0xA5, 0x5A)
+NAVY = (0x1A, 0x1A, 0x2E)
+RENDER_SIZE = 2048
+
+def generate_icon(size):
+    with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as tmp:
+        tmp_path = tmp.name
+    try:
+        subprocess.run([
+            'rsvg-convert',
+            '-w', str(RENDER_SIZE),
+            '-h', str(RENDER_SIZE),
+            SVG_PATH,
+            '-o', tmp_path,
+        ], check=True)
+        img = Image.open(tmp_path).convert('RGBA')
+        result = Image.new('RGBA', (size, size), NAVY + (255,))
+        cross = img.resize((size, size), Image.LANCZOS)
+        gold_layer = Image.new('RGBA', (size, size), GOLD + (255,))
+        result.paste(gold_layer, mask=cross.split()[3])
+        return result
+    finally:
+        os.unlink(tmp_path)
+
+for size in [192, 512]:
+    icon = generate_icon(size)
+    out = os.path.join(ICONS_DIR, f'icon-{size}.png')
+    icon.save(out, 'PNG')
+    print(f'Saved {out} ({size}x{size})')
+
+print('Icons generated.')
diff --git a/src/core/bible-reader.ts b/src/core/bible-reader.ts
new file mode 100644
index 0000000..279ae44
--- /dev/null
+++ b/src/core/bible-reader.ts
@@ -0,0 +1,203 @@
+/**
+ * Bible Reader — parses .text files and manages Bible navigation.
+ * Port of key Bible.java functionality.
+ *
+ * Bible.java is part of the Ponomar program.
+ * Copyright 2007, 2008 Aleksandr Andreev.
+ * GPL v3 — see LICENSE.
+ */
+
+// Bible types used for version metadata
+
+export interface BiblePassage {
+  bookId: string;
+  chapter: number;
+  verses: { num: number; text: string }[];
+}
+
+export interface ParsedReading {
+  chapters: number[];
+  verses: number[];
+}
+
+/**
+ * Parse a passage string like "2:11-3:2, 5, 13-14" into structured data.
+ */
+export function parsePassage(passage: string): ParsedReading {
+  const chapters: number[] = [];
+  const verses: number[] = [];
+
+  if (!passage.includes(':')) {
+    // Just a chapter, e.g. "1"
+    const ch = parseInt(passage, 10);
+    chapters.push(ch);
+    verses.push(1);
+    return { chapters, verses };
+  }
+
+  // Composite passage: "2:11-3:2, 5, 13-14"
+  const parts = passage.split(',');
+
+  for (const part of parts) {
+    const trimmed = part.trim();
+    if (!trimmed.includes('-')) {
+      // Single verse or chapter:verse
+      if (trimmed.includes(':')) {
+        const [ch, v] = trimmed.split(':');
+        chapters.push(parseInt(ch, 10));
+        verses.push(parseInt(v, 10));
+      } else {
+        const v = parseInt(trimmed, 10);
+        chapters.push(0); // current chapter
+        verses.push(v);
+      }
+    } else {
+      // Range: "2:11-3:2" or "13-14"
+      const [start, end] = trimmed.split('-');
+      if (start.includes(':')) {
+        const [ch, v] = start.split(':');
+        chapters.push(parseInt(ch, 10));
+        verses.push(parseInt(v, 10));
+      } else {
+        chapters.push(0);
+        verses.push(parseInt(start, 10));
+      }
+      if (end.includes(':')) {
+        const [ch, v] = end.split(':');
+        chapters.push(parseInt(ch, 10));
+        verses.push(parseInt(v, 10));
+      } else {
+        chapters.push(0);
+        verses.push(parseInt(end, 10));
+      }
+    }
+  }
+
+  return { chapters, verses };
+}
+
+/**
+ * Parse a .text file's content into structured verses.
+ * Format: "#N" = chapter marker, "N|" = verse marker followed by text.
+ */
+export function parseTextFile(content: string): Map<number, Map<number, string>> {
+  const chapters = new Map<number, Map<number, string>>();
+  let currentChapter = 0;
+  let currentVerses = new Map<number, string>();
+
+  const lines = content.split('\n');
+
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (!trimmed) continue;
+
+    if (trimmed.startsWith('#')) {
+      // Chapter marker
+      if (currentChapter > 0) {
+        chapters.set(currentChapter, currentVerses);
+      }
+      currentChapter = parseInt(trimmed.substring(1), 10);
+      currentVerses = new Map();
+    } else if (trimmed.includes('|')) {
+      // Verse marker
+      const pipeIdx = trimmed.indexOf('|');
+      const verseNum = parseInt(trimmed.substring(0, pipeIdx), 10);
+      const verseText = trimmed.substring(pipeIdx + 1).trim();
+      currentVerses.set(verseNum, verseText);
+    }
+  }
+
+  // Don't forget the last chapter
+  if (currentChapter > 0) {
+    chapters.set(currentChapter, currentVerses);
+  }
+
+  return chapters;
+}
+
+/**
+ * Extract a passage from parsed chapter data.
+ */
+export function extractPassage(
+  chapters: Map<number, Map<number, string>>,
+  reading: ParsedReading
+): { chapter: number; verse: number; text: string }[] {
+  const result: { chapter: number; verse: number; text: string }[] = [];
+
+  for (let i = 0; i < reading.chapters.length; i += 2) {
+    const startCh = reading.chapters[i];
+    const startV = reading.verses[i];
+    const endCh = reading.chapters[i + 1] ?? startCh;
+    const endV = reading.verses[i + 1] ?? -1;
+
+    for (const [chNum, verses] of chapters) {
+      if (chNum < startCh) continue;
+      if (chNum > endCh) break;
+
+      for (const [vNum, text] of verses) {
+        if (chNum === startCh && vNum < startV) continue;
+        if (chNum === endCh && endV > 0 && vNum > endV) continue;
+        result.push({ chapter: chNum, verse: vNum, text });
+      }
+    }
+  }
+
+  return result;
+}
+
+/**
+ * Format a passage for display.
+ */
+export function formatPassageHTML(
+  passages: { chapter: number; verse: number; text: string }[],
+  options?: { showVerseNumbers?: boolean; verseNewLine?: boolean }
+): string {
+  const showVerseNum = options?.showVerseNumbers ?? true;
+  const verseNewLine = options?.verseNewLine ?? false;
+
+  let html = '';
+  let lastChapter = 0;
+
+  for (const p of passages) {
+    if (p.chapter !== lastChapter) {
+      if (lastChapter > 0 && !verseNewLine) html += '</p>';
+      if (!verseNewLine) html += '<p>';
+      lastChapter = p.chapter;
+    }
+
+    let text = p.text;
+    text = text.replace(/\*\*(.*?)\*\*/g, '<span class="text-red italic text-sm">$1</span>');
+    text = text.replace(/\*\*/g, '');
+
+    if (verseNewLine && p.verse > 0) {
+      const num = showVerseNum ? `<sup class="text-red text-xs">${p.verse}</sup> ` : '';
+      html += `<span class="block mt-1">${num}${text.charAt(0).toUpperCase() + text.slice(1)}</span>`;
+    } else {
+      if (showVerseNum && p.verse > 0) {
+        html += `<sup class="text-red text-xs">${p.verse}</sup> `;
+      }
+      html += text + ' ';
+    }
+  }
+
+  if (!verseNewLine && lastChapter > 0) html += '</p>';
+
+  return html;
+}
+
+/**
+ * Create a hyperlink for a Bible reading reference.
+ */
+export function createReadingLink(
+  bookId: string,
+  passage: string,
+  abbrevFormat: string,
+  abbreviations: Record<string, string>
+): string {
+  const abbrev = abbreviations[bookId] ?? bookId;
+  const display = abbrevFormat
+    .replace('^NAME', abbrev)
+    .replace('^CNN', passage);
+
+  return `<a href="bible://${bookId}/${passage}" class="text-blue-underline">${display}</a>`;
+}
diff --git a/src/core/day-computer.ts b/src/core/day-computer.ts
new file mode 100644
index 0000000..69a27ef
--- /dev/null
+++ b/src/core/day-computer.ts
@@ -0,0 +1,147 @@
+/**
+ * Day Computer — computes all liturgical variables for a given Julian date.
+ * Replaces the core of Main.write() in the Java version.
+ */
+
+import { JDate } from './jdate';
+import { Paschalion } from './paschalion';
+import type { EvalContext, DayInfo } from './types';
+
+export interface ComputedDay {
+  jdate: JDate;
+  gregorian: Date;
+  evalContext: EvalContext;
+  dayInfo: DayInfo;
+}
+
+/**
+ * Compute all liturgical variables for a given Julian date.
+ * Returns both the EvalContext (for expression evaluator) and structured DayInfo.
+ */
+export function computeDay(date: JDate): ComputedDay {
+  const year = date.getYear();
+  const dow = date.getDayOfWeek();
+  const doy = date.getDoy();
+  const month = date.getMonth();
+  const day = date.getDay();
+
+  const gregorian = date.toGregorian();
+
+  // Paschal distances
+  const pascha = Paschalion.getPascha(year);
+  const nday = date.difference(pascha);
+  const ndayP = date.difference(Paschalion.getPascha(year - 1));
+  const ndayF = date.difference(Paschalion.getPascha(year + 1));
+
+  const pentecost = Paschalion.getPentecost(year);
+  const lentStart = Paschalion.getLentStart(year);
+
+  // Determine file indices for triodion/pentecostarion
+  let triodionFile: number | null = null;
+  let pentecostarionFile: number | null = null;
+
+  if (nday >= -70 && nday < 0) {
+    // Great Lent period — triodion
+    triodionFile = Math.abs(nday);
+  } else if (nday < -70) {
+    // Before Lent — pentecostarion from last year
+    const lastPascha = Paschalion.getPascha(year - 1);
+    pentecostarionFile = date.difference(lastPascha) + 1;
+  } else {
+    // After Pascha — pentecostarion
+    pentecostarionFile = nday + 1;
+  }
+
+  // Determine liturgical state
+  const isLent = nday >= -48 && nday < 0;
+  const isBrightWeek = nday >= 0 && nday <= 6;
+  const isApostlesFast = nday >= 57 && nday <= Paschalion.getApostlesFastLength(year);
+  const isDormitionFast = month === 8 && day >= 1 && day <= 14;
+  const isNativityFast = (month === 11 && day >= 15) || (month === 12 && day <= 24);
+
+  // Tone computation — 8-week cycle after Pentecost
+  // Matches Java pentecostarion XML: tone = (⌊(nday - 7) / 7⌋ % 8) + 1
+  // Exceptions: Ascension (nday 39-40) and Pentecost week (nday 48-55) have no tone
+  let tone = -1;
+  if (nday >= 7) {
+    if ((nday >= 39 && nday <= 40) || (nday >= 48 && nday <= 55)) {
+      tone = -1; // Ascension or Pentecost week — no octoechos tone
+    } else {
+      tone = (Math.floor((nday - 7) / 7) % 8) + 1;
+    }
+  }
+
+  // Rank computation
+  let dRank = 0;
+  // Major feasts get higher rank
+  if (month === 9 && day === 14) dRank = 6; // Exaltation
+  else if (month === 8 && day === 29) dRank = 6; // Beheading
+  else if (nday === 0) dRank = 8; // Pascha
+  else if (nday === 49) dRank = 8; // Pentecost
+  else if (nday === 39) dRank = 8; // Ascension
+  else if (nday === -7) dRank = 8; // Palm Sunday
+  else if (month === 12 && day === 25) dRank = 6; // Nativity
+  else if (month === 1 && day === 6) dRank = 6; // Theophany
+  else if (month === 8 && day === 15) dRank = 6; // Dormition
+  else if (month === 3 && day === 25) dRank = 6; // Annunciation
+  else if (nday >= -48 && nday < 0) dRank = 3; // Lent
+  else if (isBrightWeek || nday >= 49 && nday <= 56) dRank = 5; // Bright/Pentecost week
+
+  // Paschal flag
+  const PFlag = nday >= 0 ? 1 : 0;
+  const PFlag1 = 1; // Default service inclusion
+  const PFlag2 = isBrightWeek || (nday >= -7 && nday < 0) ? 2 : (isLent && dow !== 0 ? 1 : 0);
+
+  // Priest status (1 = priest required, 0 = reader)
+  const PS = (dRank >= 3 || dow === 0) ? 1 : 0;
+
+  const dayInfo: DayInfo = {
+    dow,
+    doy,
+    month,
+    day,
+    year,
+    nday,
+    ndayP,
+    ndayF,
+    Easter: pascha.jdn,
+    Pentecost: pentecost.jdn,
+    LentStart: lentStart.jdn,
+    Tone: tone,
+    dRank,
+    PFlag,
+    PFlag1,
+    PFlag2,
+    PS,
+    isLent,
+    isBrightWeek,
+    isApostlesFast,
+    isDormitionFast,
+    isNativityFast,
+    triodionFile,
+    pentecostarionFile,
+  };
+
+  // Build EvalContext from DayInfo (all values as numbers for the expression evaluator)
+  const evalContext: EvalContext = {
+    dow,
+    doy,
+    nday,
+    ndayP,
+    ndayF,
+    Year: year,
+    dRank,
+    PFlag,
+    PFlag1,
+    PFlag2,
+    PS,
+    Tone: tone,
+    Easter: pascha.jdn,
+    Pentecost: pentecost.jdn,
+    LentStart: lentStart.jdn,
+    LS: 1, // Default language
+    GS: 1, // Default gospel selector
+  };
+
+  return { jdate: date, gregorian, evalContext, dayInfo };
+}
diff --git a/src/core/evaluator.ts b/src/core/evaluator.ts
new file mode 100644
index 0000000..82042ef
--- /dev/null
+++ b/src/core/evaluator.ts
@@ -0,0 +1,294 @@
+/**
+ * Expression evaluator — recursive descent parser.
+ * Faithful port of Ponomar/StringOp.java to TypeScript.
+ * Supports: ||, &&, ==, !=, <, >, <=, >=, +, -, *, /, %, unary !, unary -, true/false, variables.
+ *
+ * StringOp.java is part of the Ponomar program.
+ * Copyright 2007 Aleksandr Andreev and Yuri Shardt.
+ * See LICENSE for redistribution terms.
+ */
+
+import type { EvalContext } from './types';
+
+function bool2double(expr: boolean): number {
+  return expr ? 1.0 : 0.0;
+}
+
+/**
+ * Evaluate a boolean expression using dayInfo variable context.
+ * Returns true if the expression evaluates to a non-zero number.
+ */
+export function evalBool(expression: string, ctx: EvalContext): boolean {
+  return evalNum(expression, ctx) !== 0;
+}
+
+/**
+ * Evaluate a numeric expression.
+ * Fully obeys correct order of operations (recursive descent).
+ */
+export function evalNum(expression: string, ctx: EvalContext): number {
+  const parser = new ExprParser(expression.trim(), ctx);
+  return parser.parseOr();
+}
+
+class ExprParser {
+  private pos = 0;
+  private readonly src: string;
+  private readonly ctx: EvalContext;
+
+  constructor(expression: string, ctx: EvalContext) {
+    // Strip all spaces for tokenization (matches Java behavior)
+    this.src = expression.replace(/\s/g, '');
+    this.ctx = ctx;
+  }
+
+  private peek(): string {
+    return this.pos < this.src.length ? this.src[this.pos] : '';
+  }
+
+  private advance(): string {
+    const ch = this.src[this.pos];
+    this.pos++;
+    return ch;
+  }
+
+  private peekTwo(): string {
+    return this.src.substring(this.pos, this.pos + 2);
+  }
+
+  /**
+   * Read a token: number, variable name, or keyword (true/false).
+   */
+  private readToken(): string {
+    // Number
+    if (/[0-9.]/.test(this.peek())) {
+      let num = '';
+      while (this.pos < this.src.length && /[0-9.eE+\-]/.test(this.peek())) {
+        num += this.advance();
+      }
+      return num;
+    }
+    // Variable or keyword
+    if (/[a-zA-Z_]/.test(this.peek())) {
+      let name = '';
+      while (this.pos < this.src.length && /[a-zA-Z_0-9]/.test(this.peek())) {
+        name += this.advance();
+      }
+      return name;
+    }
+    return '';
+  }
+
+  /**
+   * OR operator: lowest precedence.
+   * expr || expr
+   */
+  parseOr(): number {
+    let left = this.parseAnd();
+    while (this.pos < this.src.length && this.peekTwo() === '||') {
+      this.pos += 2;
+      const right = this.parseAnd();
+      left = bool2double(evalBool(String(left !== 0), this.ctx) || evalBool(String(right !== 0), this.ctx));
+    }
+    return left;
+  }
+
+  /**
+   * AND operator.
+   */
+  parseAnd(): number {
+    let left = this.parseEquality();
+    while (this.pos < this.src.length && this.peekTwo() === '&&') {
+      this.pos += 2;
+      const right = this.parseEquality();
+      left = bool2double(evalBool(String(left !== 0), this.ctx) && evalBool(String(right !== 0), this.ctx));
+    }
+    return left;
+  }
+
+  /**
+   * Equality: == and !=
+   */
+  parseEquality(): number {
+    let left = this.parseComparison();
+    while (this.pos < this.src.length) {
+      if (this.peekTwo() === '==') {
+        this.pos += 2;
+        const right = this.parseComparison();
+        left = bool2double(left === right);
+      } else if (this.peekTwo() === '!=') {
+        this.pos += 2;
+        const right = this.parseComparison();
+        left = bool2double(left !== right);
+      } else {
+        break;
+      }
+    }
+    return left;
+  }
+
+  /**
+   * Comparison: <, >, <=, >=
+   */
+  parseComparison(): number {
+    let left = this.parseAddSub();
+    while (this.pos < this.src.length) {
+      const ch = this.peek();
+      if (ch === '<' || ch === '>') {
+        const next = this.pos + 1 < this.src.length ? this.src[this.pos + 1] : '';
+        if (next === '=') {
+          // <= or >=
+          if (ch === '<') {
+            this.pos += 2;
+            const right = this.parseAddSub();
+            left = bool2double(left <= right);
+          } else {
+            this.pos += 2;
+            const right = this.parseAddSub();
+            left = bool2double(left >= right);
+          }
+        } else {
+          // < or >
+          if (ch === '<') {
+            this.pos += 1;
+            const right = this.parseAddSub();
+            left = bool2double(left < right);
+          } else {
+            this.pos += 1;
+            const right = this.parseAddSub();
+            left = bool2double(left > right);
+          }
+        }
+      } else {
+        break;
+      }
+    }
+    return left;
+  }
+
+  /**
+   * Addition and subtraction.
+   * Must distinguish binary + from unary +/-.
+   */
+  parseAddSub(): number {
+    let left = this.parseMulDiv();
+
+    while (this.pos < this.src.length) {
+      const ch = this.peek();
+      if (ch === '+') {
+        this.pos += 1;
+        const right = this.parseMulDiv();
+        left = left + right;
+      } else if (ch === '-') {
+        // Check if this is a binary minus (preceded by a value) or unary
+        // If preceded by operator or start, it's unary — handled by parseMulDiv → parseUnary
+        // Here we need to check if this is a binary minus
+        // A minus is binary if preceded by: number, ), variable, true, false
+        if (this.pos > 0) {
+          const prevCh = this.src[this.pos - 1];
+          if (/[0-9)TrueFals]/.test(prevCh) || prevCh === 'e' || prevCh === 'E') {
+            this.pos += 1;
+            const right = this.parseMulDiv();
+            left = left - right;
+          } else {
+            break;
+          }
+        } else {
+          break;
+        }
+      } else {
+        break;
+      }
+    }
+    return left;
+  }
+
+  /**
+   * Multiplication, division, modulus.
+   */
+  parseMulDiv(): number {
+    let left = this.parseUnary();
+
+    while (this.pos < this.src.length) {
+      const ch = this.peek();
+      if (ch === '*') {
+        this.pos += 1;
+        const right = this.parseUnary();
+        left = left * right;
+      } else if (ch === '/') {
+        this.pos += 1;
+        const right = this.parseUnary();
+        left = left / right;
+      } else if (ch === '%') {
+        this.pos += 1;
+        const right = this.parseUnary();
+        left = left % right;
+      } else {
+        break;
+      }
+    }
+    return left;
+  }
+
+  /**
+   * Unary operators: !, -
+   */
+  parseUnary(): number {
+    // Handle repeated unary operators (e.g., "!!", "---")
+    while (this.pos < this.src.length) {
+      const ch = this.peek();
+      if (ch === '!') {
+        this.pos += 1;
+        const val = this.parseUnary();
+        return bool2double(val === 0);
+      } else if (ch === '-') {
+        this.pos += 1;
+        const val = this.parseUnary();
+        return -val;
+      } else if (ch === '+') {
+        this.pos += 1;
+        continue;
+      } else {
+        break;
+      }
+    }
+    return this.parsePrimary();
+  }
+
+  /**
+   * Primary: number, variable, parenthesized expression, true/false.
+   */
+  parsePrimary(): number {
+    // Parenthesized expression
+    if (this.peek() === '(') {
+      this.pos++; // skip (
+      const val = this.parseOr();
+      if (this.peek() === ')') {
+        this.pos++; // skip )
+      }
+      return val;
+    }
+
+    const token = this.readToken();
+
+    if (token === 'true' || token === 'True') {
+      return 1.0;
+    }
+    if (token === 'false' || token === 'False') {
+      return 0.0;
+    }
+
+    // Try as number
+    const num = Number(token);
+    if (!isNaN(num)) {
+      return num;
+    }
+
+    // Variable lookup
+    if (token in this.ctx) {
+      return Number(this.ctx[token]);
+    }
+
+    throw new Error(`Unknown variable: ${token}`);
+  }
+}
diff --git a/src/core/fasting.ts b/src/core/fasting.ts
new file mode 100644
index 0000000..8465c25
--- /dev/null
+++ b/src/core/fasting.ts
@@ -0,0 +1,156 @@
+/**
+ * Fasting rules engine.
+ * Evaluates Fasting.xml rules against dayInfo to determine fasting level for a given day.
+ *
+ * Fasting.java is part of the Ponomar program.
+ * Copyright 2009 Yuri Shardt.
+ * GPL v3 — see LICENSE.
+ */
+
+import { evalBool } from './evaluator';
+import type { EvalContext } from './types';
+
+/** 7-bit fasting case string. Each bit: 1=permitted, 0=forbidden. */
+export type FastingCase = string;
+
+export interface FastingPeriod {
+  cmd: string;
+  rules: FastingRule[];
+}
+
+export interface FastingRule {
+  case: FastingCase;
+  cmd: string;
+}
+
+export interface FastingResult {
+  case: FastingCase;
+  level: number; // 0-6
+  description: string;
+  allowed: string[];
+  forbidden: string[];
+}
+
+const FOOD_NAMES_LOCALIZED: Record<string, string[]> = {
+  en: ['meat', 'dairy products', 'fish', 'caviar', 'oil', 'wine', 'dry food'],
+  ru: ['мясо', 'молочные продукты', 'рыба', 'рыбная икра', 'растительное масло', 'вино', 'сухоядение'],
+  cu: ['мѧ́со', 'мла҆чные продꙋ́кты', 'ры́ба', 'ры́бнаѧ и҆́кра', 'є҆ле́й', 'ві́но̀', 'сухоѧденїе'],
+  fr: ['le viande', 'les produits lactières', 'le poisson', 'le caviar', "l'huile", 'le vin', 'des nourritures secs'],
+  el: ['meat', 'dairy products', 'fish', 'caviar', 'oil', 'wine', 'dry food'],
+  zh: ['肉类和动物制品', '乳制品', '鱼', '鱼子', '油', '酒', '干食'],
+  'zh-Hant': ['肉類和動物製品', '乳製品', '魚', '魚子', '油', '酒', '幹食'],
+};
+
+/**
+ * Parse fasting XML data. The XML is pre-converted to JSON at build time.
+ */
+export function parseFastingData(data: FastingPeriod[]): FastingPeriod[] {
+  return data;
+}
+
+/**
+ * Evaluate fasting rules for a given day.
+ * Returns the fasting case (7-bit string) based on matching rules.
+ */
+export function evaluateFasting(
+  periods: FastingPeriod[],
+  ctx: EvalContext,
+  lang: string = 'en'
+): FastingResult {
+  let currentCase: FastingCase = '1111111'; // Default: no fast
+
+  // Process periods in order; later periods can override earlier ones
+  for (const period of periods) {
+    // Check if this period applies to today
+    if (period.cmd && !evalBool(period.cmd, ctx)) {
+      continue;
+    }
+
+    // Evaluate rules within this period
+    for (const rule of period.rules) {
+      if (rule.cmd && !evalBool(rule.cmd, ctx)) {
+        continue;
+      }
+      // This rule matches — apply it
+      currentCase = rule.case;
+    }
+  }
+
+  return formatFastingResult(currentCase, lang);
+}
+
+/**
+ * Format a fasting case into a human-readable result.
+ */
+function formatFastingResult(fastCase: FastingCase, lang: string = 'en'): FastingResult {
+  const names = FOOD_NAMES_LOCALIZED[lang] || FOOD_NAMES_LOCALIZED.en;
+  const allowed: string[] = [];
+  const forbidden: string[] = [];
+
+  // Case format: meat,cheese,fish,caviar,oil,wine,dryFood
+  // Index 0 = meat, 6 = dry food (leftmost = highest food, rightmost = lowest)
+  for (let i = 0; i < 7; i++) {
+    const permitted = fastCase[i] === '1';
+    if (permitted) {
+      allowed.push(names[i]);
+    } else {
+      forbidden.push(names[i]);
+    }
+  }
+
+  // Determine fasting level
+  let level = 0;
+  switch (fastCase) {
+    case '1111111': level = 0; break; // No fast
+    case '0111111': level = 1; break; // Meat excluded
+    case '0011111': level = 2; break; // Fish permitted
+    case '0001111': level = 3; break; // Caviar permitted
+    case '0000111': level = 4; break; // Wine and oil
+    case '0000011': level = 5; break; // Without oil
+    case '0000001': level = 6; break; // Dry food only (xerophagy)
+    case '0000000': level = 7; break; // Complete fast
+    default: level = 0;
+  }
+
+  // Generate description
+  const description = generateDescription(fastCase, allowed, forbidden, lang);
+
+  return {
+    case: fastCase,
+    level,
+    description,
+    allowed,
+    forbidden,
+  };
+}
+
+function generateDescription(
+  fastCase: FastingCase,
+  allowed: string[],
+  forbidden: string[],
+  lang: string
+): string {
+  if (fastCase === '1111111') {
+    return lang === 'ru' ? 'Поста нет' : lang === 'cu' ? 'Поста нѣтъ' : 'No fast';
+  }
+  if (fastCase === '0000000') {
+    return lang === 'ru' ? 'Полное воздержание от пищи' : lang === 'cu' ? 'Полное воздержаніе отъ пищи' : 'Complete fast (no food)';
+  }
+
+  const labels: Record<string, { permitted: string; forbidden: string; is: string; are: string }> = {
+    en: { permitted: 'Permitted', forbidden: 'Forbidden', is: 'is', are: 'are' },
+    ru: { permitted: 'Разрешено', forbidden: 'Запрещено', is: '', are: '' },
+    cu: { permitted: 'Позволено', forbidden: 'Запрещено', is: '', are: '' },
+  };
+  const L = labels[lang] || labels.en;
+
+  if (allowed.length === 0) {
+    return `${L.forbidden}: ${forbidden.join(', ')}`;
+  }
+  if (forbidden.length === 0) {
+    return `${L.permitted}: ${allowed.join(', ')}`;
+  }
+  const verb = allowed.length === 1 ? L.is : L.are;
+  const verbF = forbidden.length === 1 ? L.is : L.are;
+  return `${L.permitted} ${verb} ${allowed.join(', ')}. ${L.forbidden} ${verbF} ${forbidden.join(', ')}`;
+}
diff --git a/src/core/i18n.ts b/src/core/i18n.ts
new file mode 100644
index 0000000..b88bffe
--- /dev/null
+++ b/src/core/i18n.ts
@@ -0,0 +1,751 @@
+/**
+ * Internationalization (i18n) module for Ponomar PWA.
+ * Provides translations for UI strings in English, Russian, and Church Slavonic.
+ */
+
+export type LanguageCode = 'en' | 'ru' | 'cu';
+
+export interface Translations {
+  // General
+  appName: string;
+  loading: string;
+  error: string;
+  notAvailable: string;
+
+  // Navigation
+  nav: {
+    calendar: string;
+    service: string;
+    bible: string;
+    settings: string;
+  };
+
+  // Calendar
+  calendar: {
+    months: string[];
+    monthsGenitive: string[];
+    dayNames: string[];
+    dayNamesFull: string[];
+    rankLabels: Record<number, string>;
+    rankIcons: Record<number, string>;
+    pascha: string;
+    pentecost: string;
+    cleanMonday: string;
+    greatLent: string;
+    brightWeek: string;
+    weekAfterPentecost: string;
+    weekOrdSuffix: string;
+    apostlesFast: string;
+    dormitionFast: string;
+    nativityFast: string;
+    commemorations: string;
+    fastingRule: string;
+    readings: string;
+    noCommemorations: string;
+    noReadings: string;
+    readingTypes: Record<string, string>;
+    defaultBibleVersion: string;
+    dayReading: string[];
+    readSep: string;
+    colon: string;
+    dayOfYear: string;
+    ofYear: string;
+    tone: string;
+    gregorianDate: string;
+    churchDate: string;
+    annoMundi: string;
+    yearOfWorld: string;
+    fromYear: string;
+    fromAdam: string;
+  };
+
+  // Services
+  services: {
+    title: string;
+    selectService: string;
+    serviceProducedNoOutput: string;
+    errorLoading: string;
+    nodesAssembled: string;
+    greatLent: string;
+    brightWeek: string;
+    apostlesFast: string;
+    dormitionFast: string;
+    nativityFast: string;
+    tone: string;
+    roleLabel: string;
+    rolePriest: string;
+    roleReader: string;
+    roleAuto: string;
+    serviceNames: {
+      primes: string;
+      third: string;
+      sixth: string;
+      ninth: string;
+      vespers: string;
+      liturgy: string;
+      royalhours: string;
+      compline: string;
+    };
+    serviceDescriptions: {
+      primes: string;
+      third: string;
+      sixth: string;
+      ninth: string;
+      vespers: string;
+      liturgy: string;
+      royalhours: string;
+      compline: string;
+    };
+  };
+
+  // Bible
+  bible: {
+    selectBook: string;
+    selectChapter: string;
+    read: string;
+    loading: string;
+    noTextFound: string;
+    notAvailableOffline: string;
+    ensureDataConverted: string;
+  };
+
+  // Settings
+  settings: {
+    title: string;
+    language: string;
+    fontSettings: string;
+    usePonomarFont: string;
+    usePonomarFontDesc: string;
+    fontPreview: string;
+    fontPreviewNoteActive: string;
+    fontPreviewNoteInactive: string;
+    fontSize: string;
+    systemFont: string;
+    bibleSettings: string;
+    defaultTranslation: string;
+    showVerseNumbers: string;
+    verseNewLine: string;
+    bibleComments: {
+      fullBible: string;
+      ntOnly: string;
+      otOnly: string;
+      otProphets: string;
+    };
+    calendarType: string;
+    julian: string;
+    gregorian: string;
+    about: string;
+    aboutText: string;
+    aboutLicense: string;
+    installPwa: string;
+  };
+
+  // Common
+  common: {
+    priest: string;
+    reader: string;
+    deacon: string;
+    choir: string;
+    all: string;
+  };
+}
+
+const translations: Record<LanguageCode, Translations> = {
+  en: {
+    appName: '☦ Ponomar',
+    loading: 'Loading...',
+    error: 'Error',
+    notAvailable: 'Not available',
+
+    nav: {
+      calendar: '📅 Calendar',
+      service: '📖 Service',
+      bible: '☦ Bible',
+      settings: '⚙ Settings',
+    },
+
+    calendar: {
+      months: [
+        'January', 'February', 'March', 'April', 'May', 'June',
+        'July', 'August', 'September', 'October', 'November', 'December'
+      ],
+      monthsGenitive: [
+        'January', 'February', 'March', 'April', 'May', 'June',
+        'July', 'August', 'September', 'October', 'November', 'December'
+      ],
+      dayNames: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
+      dayNamesFull: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
+      rankLabels: {
+        1: 'Troparion',
+        2: 'Antiphon',
+        3: 'Hexahymn',
+        4: 'Doxology',
+        5: 'Polyeleos',
+        6: 'Great Saint',
+        7: 'Great Feast of the Theotokos',
+        8: 'Great Feast of the Lord',
+      },
+      rankIcons: {
+        2: '🕃',
+        3: '🕃',
+        4: '🕂',
+        5: '🕁',
+        6: '🕀',
+      },
+      pascha: 'Pascha: ',
+      pentecost: 'Pentecost: ',
+      cleanMonday: 'Clean Monday: ',
+      greatLent: ' · Great Lent',
+      brightWeek: ' · Bright Week',
+      weekAfterPentecost: 'week after Pentecost',
+      weekOrdSuffix: 'th',
+      apostlesFast: " · Apostles' Fast",
+      dormitionFast: ' · Dormition Fast',
+      nativityFast: ' · Nativity Fast',
+      commemorations: 'Commemorations',
+      fastingRule: 'Fasting Rule',
+      readings: 'Readings',
+      noCommemorations: 'No commemorations for this day',
+      noReadings: 'No readings assigned',
+      readingTypes: {
+        apostol: 'Apostol',
+        gospel: 'Gospel',
+        matins: 'Matins',
+        vespers: 'Vespers',
+        primes: '1st Hour',
+        terce: '3rd Hour',
+        sext: '6th Hour',
+        none: '9th Hour',
+        liturgy: 'Liturgy',
+        '0': 'Vespers',
+        '1': 'Reading',
+        '2': 'Reading',
+        '3': 'Reading',
+        '4': '4th Reading',
+        '5': '5th Reading',
+        '6': '6th Reading',
+        '7': '7th Reading',
+        '8': '8th Reading',
+        '9': '9th Reading',
+        '10': '10th Reading',
+        '11': '11th Reading',
+        '12': '12th Reading',
+        '13': '13th Reading',
+        '14': '14th Reading',
+        '15': '15th Reading',
+        A: 'Reading',
+      },
+      defaultBibleVersion: 'en/bible/kjv',
+      dayReading: ['for Sunday', 'for Monday', 'for Tuesday', 'for Wednesday', 'for Thursday', 'for Friday', 'for Saturday'],
+      readSep: '; ',
+      colon: ': ',
+      dayOfYear: ' · Day ',
+      ofYear: ' of year',
+      tone: 'Tone ',
+      gregorianDate: 'Civil (Gregorian) Date',
+      churchDate: 'Church (Julian) Date',
+      annoMundi: 'Year of the World',
+      yearOfWorld: 'year of the world',
+      fromYear: 'from Christ',
+      fromAdam: 'from Adam',
+    },
+
+    services: {
+      title: 'Services',
+      selectService: 'Select a service to view its content.',
+      serviceProducedNoOutput: 'Service produced no output.',
+      errorLoading: 'Error loading service.',
+      nodesAssembled: 'nodes assembled.',
+      greatLent: ' · Great Lent',
+      brightWeek: ' · Bright Week',
+      apostlesFast: " · Apostles' Fast",
+      dormitionFast: ' · Dormition Fast',
+      nativityFast: ' · Nativity Fast',
+      tone: ' · Tone ',
+      roleLabel: 'Role:',
+      rolePriest: 'Priest',
+      roleReader: 'Reader',
+      roleAuto: 'Auto',
+      serviceNames: {
+        primes: 'First Hour',
+        third: 'Third Hour',
+        sixth: 'Sixth Hour',
+        ninth: 'Ninth Hour',
+        vespers: 'Vespers',
+        liturgy: 'Divine Liturgy',
+        royalhours: 'Royal Hours',
+        compline: 'Compline',
+      },
+      serviceDescriptions: {
+        primes: 'Prime (First Hour)',
+        third: 'Third Hour',
+        sixth: 'Sixth Hour',
+        ninth: 'Ninth Hour',
+        vespers: 'Evening service (Vespers)',
+        liturgy: 'Principal service (Divine Liturgy)',
+        royalhours: 'Royal Hours',
+        compline: 'Night office (Compline)',
+      },
+    },
+
+    bible: {
+      selectBook: 'Select a book',
+      selectChapter: 'Select a chapter',
+      read: 'Read',
+      loading: 'Loading...',
+      noTextFound: 'No text found for this passage.',
+      notAvailableOffline: 'Text not available for offline viewing.',
+      ensureDataConverted: 'Bible text files are lazy-loaded on demand. Please ensure the data has been converted and is available.',
+    },
+
+    settings: {
+      title: 'Settings',
+      language: 'Interface Language',
+      fontSettings: 'Church Slavonic Font',
+      usePonomarFont: 'Use Ponomar font for Church Slavonic texts',
+      usePonomarFontDesc: 'Use Ponomar font for Church Slavonic texts',
+      fontPreview: 'Preview:',
+      fontPreviewNoteActive: 'Ponomar font active — liturgical rank icons will render correctly',
+      fontPreviewNoteInactive: 'System font active — rank icons will use Ponomar font regardless',
+      fontSize: 'Liturgical Text Size: ',
+      systemFont: 'System Default',
+      bibleSettings: 'Bible',
+      defaultTranslation: 'Default Translation',
+      showVerseNumbers: 'Show verse numbers',
+      verseNewLine: 'Each verse on a new line',
+      bibleComments: {
+        fullBible: 'Full Bible',
+        ntOnly: 'NT only',
+        otOnly: 'OT only',
+        otProphets: 'OT Prophets',
+      },
+      calendarType: 'Default Calendar',
+      julian: 'Julian',
+      gregorian: 'Gregorian',
+      about: 'About Ponomar',
+      aboutText: 'Ponomar is an Orthodox Church calendar application providing liturgical information, service texts, and Bible readings in multiple languages.',
+      aboutLicense: 'Based on the Ponomar Java desktop application by Aleksandr Andreev and Yuri Shardt. Licensed under GPL v3.',
+      installPwa: 'Install Ponomar',
+    },
+
+    common: {
+      priest: 'Priest',
+      reader: 'Reader',
+      deacon: 'Deacon',
+      choir: 'Choir',
+      all: 'All',
+    },
+  },
+
+  ru: {
+    appName: '☦ Понома́рь',
+    loading: 'Загрузка...',
+    error: 'Ошибка',
+    notAvailable: 'Недоступно',
+
+    nav: {
+      calendar: '📅 Календарь',
+      service: '📖 Устав',
+      bible: '☦ Библия',
+      settings: '⚙ Настройки',
+    },
+
+    calendar: {
+      months: [
+        'Январь', 'Февраль', 'Март', 'Апрель', 'Май', 'Июнь',
+        'Июль', 'Август', 'Сентябрь', 'Октябрь', 'Ноябрь', 'Декабрь'
+      ],
+      monthsGenitive: [
+        'января', 'февраля', 'марта', 'апреля', 'мая', 'июня',
+        'июля', 'августа', 'сентября', 'октября', 'ноября', 'декабря'
+      ],
+      dayNames: ['Вс', 'Пн', 'Вт', 'Ср', 'Чт', 'Пт', 'Сб'],
+      dayNamesFull: ['Воскресенье', 'Понедельник', 'Вторник', 'Среда', 'Четверг', 'Пятница', 'Суббота'],
+      rankLabels: {
+        1: 'Тропарь',
+        2: 'Антифон',
+        3: 'Шестипеснец',
+        4: 'Славословие',
+        5: 'Полиелей',
+        6: 'Великий святой',
+        7: 'Великий праздник Богородичный',
+        8: 'Великий праздник Господень',
+      },
+      rankIcons: {
+        2: '🕃',
+        3: '🕃',
+        4: '🕂',
+        5: '🕁',
+        6: '🕀',
+      },
+      pascha: 'Пасха: ',
+      pentecost: 'Пятидесятница: ',
+      cleanMonday: 'Чистый понедельник: ',
+      greatLent: ' · Великий пост',
+      brightWeek: ' · Светлая седмица',
+      weekAfterPentecost: 'седмица по Пятидесятнице',
+      weekOrdSuffix: 'я',
+      apostlesFast: ' · Петров пост',
+      dormitionFast: ' · Успенский пост',
+      nativityFast: ' · Рождественский пост',
+      commemorations: 'Память святых',
+      fastingRule: 'Правило поста',
+      readings: 'Чтения',
+      noCommemorations: 'Нет памятей на этот день',
+      noReadings: 'Чтения не назначены',
+      readingTypes: {
+        apostol: 'Апостол',
+        gospel: 'Евангелие',
+        matins: 'Утреня',
+        vespers: 'Вечерня',
+        primes: '1-й час',
+        terce: '3-й час',
+        sext: '6-й час',
+        none: '9-й час',
+        liturgy: 'Литургия',
+        '0': 'Вечерня',
+        '1': 'Вечерня',
+        '2': 'Вечерня',
+        '3': 'Вечерня',
+        '4': '4-е чтение',
+        '5': '5-е чтение',
+        '6': '6-е чтение',
+        '7': '7-е чтение',
+        '8': '8-е чтение',
+        '9': '9-е чтение',
+        '10': '10-е чтение',
+        '11': '11-е чтение',
+        '12': '12-е чтение',
+        '13': '13-е чтение',
+        '14': '14-е чтение',
+        '15': '15-е чтение',
+        A: 'Чтение',
+      },
+      defaultBibleVersion: 'ru/bible/synod',
+      dayReading: ['для воскресенья', 'для понедельника', 'для вторника', 'для среды', 'для четверга', 'для пятницы', 'для субботы'],
+      readSep: '; ',
+      colon: ': ',
+      dayOfYear: ' · День ',
+      ofYear: ' года',
+      tone: 'Глас ',
+      gregorianDate: 'По гражданскому стилю',
+      churchDate: 'По церковному стилю',
+      annoMundi: 'Лета от сотворения мира',
+      yearOfWorld: 'год от сотворения мира',
+      fromYear: 'от РХ',
+      fromAdam: 'от Адама',
+    },
+
+    services: {
+      title: 'Богослужения',
+      selectService: 'Выберите богослужение для просмотра.',
+      serviceProducedNoOutput: 'Богослужение не дало текста.',
+      errorLoading: 'Ошибка загрузки богослужения.',
+      nodesAssembled: 'узлов собрано.',
+      greatLent: ' · Великий пост',
+      brightWeek: ' · Светлая седмица',
+      apostlesFast: ' · Петров пост',
+      dormitionFast: ' · Успенский пост',
+      nativityFast: ' · Рождественский пост',
+      tone: ' · Глас ',
+      roleLabel: 'Чин:',
+      rolePriest: 'Священник',
+      roleReader: 'Чтец',
+      roleAuto: 'Авто',
+      serviceNames: {
+        primes: 'Первый час',
+        third: 'Третий час',
+        sixth: 'Шестой час',
+        ninth: 'Девятый час',
+        vespers: 'Вечерня',
+        liturgy: 'Божественная Литургия',
+        royalhours: 'Царские часы',
+        compline: 'Повечерие',
+      },
+      serviceDescriptions: {
+        primes: 'Час первый',
+        third: 'Час третий',
+        sixth: 'Час шестой',
+        ninth: 'Час девятый',
+        vespers: 'Вечернее богослужение (Вечерня)',
+        liturgy: 'Главное богослужение (Божественная Литургия)',
+        royalhours: 'Царские часы',
+        compline: 'Ночное богослужение (Повечерие)',
+      },
+    },
+
+    bible: {
+      selectBook: 'Выберите книгу',
+      selectChapter: 'Выберите главу',
+      read: 'Читать',
+      loading: 'Загрузка...',
+      noTextFound: 'Текст не найден для этого отрывка.',
+      notAvailableOffline: 'Текст недоступен для просмотра в автономном режиме.',
+      ensureDataConverted: 'Файлы библейского текста загружаются по требованию. Убедитесь, что данные сконвертированы и доступны.',
+    },
+
+    settings: {
+      title: 'Настройки',
+      language: 'Язык интерфейса',
+      fontSettings: 'Шрифт церковнославянского',
+      usePonomarFont: 'Использовать шрифт Понома́рь для церковнославянских текстов',
+      usePonomarFontDesc: 'Использовать шрифт Понома́рь для церковнославянских текстов',
+      fontPreview: 'Предпросмотр:',
+      fontPreviewNoteActive: 'Шрифт Понома́рь активен — иконы чинов будут отображаться правильно',
+      fontPreviewNoteInactive: 'Системный шрифт активен — иконы чинов будут использовать Понома́рь в любом случае',
+      fontSize: 'Размер литургического текста: ',
+      systemFont: 'Системный шрифт',
+      bibleSettings: 'Библия',
+      defaultTranslation: 'Перевод по умолчанию',
+      showVerseNumbers: 'Показывать номера стихов',
+      verseNewLine: 'Каждый стих с новой строки',
+      bibleComments: {
+        fullBible: 'Полная Библия',
+        ntOnly: 'Новый Завет',
+        otOnly: 'Ветхий Завет',
+        otProphets: 'Пророки',
+      },
+      calendarType: 'Календарь по умолчанию',
+      julian: 'Юлианский',
+      gregorian: 'Григорианский',
+      about: 'О Понома́ре',
+      aboutText: 'Понома́рь — приложение православного календаря, предоставляющее литургическую информацию, тексты служб и библейские чтения на нескольких языках.',
+      aboutLicense: 'Основано на Java-приложении Понома́рь от Александра Андреева и Юрия Шардт. Лицензия GPL v3.',
+      installPwa: 'Установить Пономарь',
+    },
+
+    common: {
+      priest: 'Свящ.',
+      reader: 'Чтец',
+      deacon: 'Диакон',
+      choir: 'Хор',
+      all: 'Все',
+    },
+  },
+
+  cu: {
+    appName: '☦ Понома́рь',
+    loading: 'Загрузка...',
+    error: 'Ошибка',
+    notAvailable: 'Недоступно',
+
+    nav: {
+      calendar: '📅 Календарь',
+      service: '📖 Уставъ',
+      bible: '☦ Библия',
+      settings: '⚙ Настройки',
+    },
+
+    calendar: {
+      months: [
+        'Январь', 'Февраль', 'Мартъ', 'Апрель', 'Май', 'Июнь',
+        'Июль', 'Августъ', 'Сентябрь', 'Октябрь', 'Ноябрь', 'Декабрь'
+      ],
+      monthsGenitive: [
+        'января', 'февраля', 'марта', 'апрѣля', 'мая', 'іюня',
+        'іюля', 'августа', 'септемврія', 'октоврія', 'ноемврія', 'декаврія'
+      ],
+      dayNames: ['Нед', 'Пон', 'Вто', 'Сре', 'Чет', 'Пят', 'Суб'],
+      dayNamesFull: ['Неделя', 'Понедельникъ', 'Вторникъ', 'Среда', 'Четвергъ', 'Пятница', 'Суббота'],
+      rankLabels: {
+        1: 'Тропарь',
+        2: 'Антифонъ',
+        3: 'Шестопѣснецъ',
+        4: 'Славословіе',
+        5: 'Полиелей',
+        6: 'Великій святой',
+        7: 'Великій праздникъ Богородичный',
+        8: 'Великій праздникъ Господень',
+      },
+      rankIcons: {
+        2: '🕃',
+        3: '🕃',
+        4: '🕂',
+        5: '🕁',
+        6: '🕀',
+      },
+      pascha: 'Пасха: ',
+      pentecost: 'Пятидесятница: ',
+      cleanMonday: 'Чистый понедельникъ: ',
+      greatLent: ' · Великій постъ',
+      brightWeek: ' · Светлая седмица',
+      weekAfterPentecost: 'седмица по Пѧтидесѧтницѣ',
+      weekOrdSuffix: 'ѧ',
+      apostlesFast: ' · Петровъ постъ',
+      dormitionFast: ' · Успенскій постъ',
+      nativityFast: ' · Рождественскій постъ',
+      commemorations: 'Память святыхъ',
+      fastingRule: 'Правило поста',
+      readings: 'Чтения',
+      noCommemorations: 'Нетъ памятей на сей день',
+      noReadings: 'Чтения не назначаются',
+      readingTypes: {
+        apostol: 'А҆пⷭ҇лъ',
+        gospel: 'Є҆ѵⷢ҇лїе',
+        matins: 'Оу҆́тренѧ',
+        vespers: 'Вече́рнѧ',
+        primes: 'Ча́съ пе́рвый',
+        terce: 'Ча́съ тре́тїй',
+        sext: 'Ча́съ шесты́й',
+        none: 'Ча́съ девѧ́тый',
+        liturgy: 'Лїтꙋргі́ѧ',
+        '0': 'Вече́рнѧ',
+        '1': 'Вече́рнѧ',
+        '2': 'Вече́рнѧ',
+        '3': 'Вече́рнѧ',
+        '4': '4-е чте́ніе',
+        '5': '5-е чте́ніе',
+        '6': '6-е чте́ніе',
+        '7': '7-е чте́ніе',
+        '8': '8-е чте́ніе',
+        '9': '9-е чте́ніе',
+        '10': '10-е чте́ніе',
+        '11': '11-е чте́ніе',
+        '12': '12-е чте́ніе',
+        '13': '13-е чте́ніе',
+        '14': '14-е чте́ніе',
+        '15': '15-е чте́ніе',
+        A: 'Чте́ніе',
+      },
+      defaultBibleVersion: 'cu/bible/elis',
+      dayReading: ['длѧ̀ недѣ́ли', 'длѧ̀ понедѣ́льника', 'длѧ̀ вто́рника', 'длѧ̀ сре́ды', 'длѧ̀ четвертка̀', 'длѧ̀ пѧткѝ', 'длѧ̀ сꙋббѡ́ты'],
+      readSep: ': ',
+      colon: ': ',
+      dayOfYear: ' · День ',
+      ofYear: ' года',
+      tone: 'Гласъ ',
+      gregorianDate: 'По гражданскому стилю',
+      churchDate: 'По церковному стилю',
+      annoMundi: 'Лѣта отъ сотворенiя мiра',
+      yearOfWorld: 'лѣта отъ сотворенiя мiра',
+      fromYear: 'от РХ',
+      fromAdam: 'от Адама',
+    },
+
+    services: {
+      title: 'Богослуженiя',
+      selectService: 'Изберете богослуженiе для просмотра.',
+      serviceProducedNoOutput: 'Богослуженiе не дало текста.',
+      errorLoading: 'Ошибка загрузки богослуженiя.',
+      nodesAssembled: 'узлов собрано.',
+      greatLent: ' · Великій постъ',
+      brightWeek: ' · Светлая седмица',
+      apostlesFast: ' · Петровъ постъ',
+      dormitionFast: ' · Успенскій постъ',
+      nativityFast: ' · Рождественскій постъ',
+      tone: ' · Гласъ ',
+      roleLabel: 'Чинъ:',
+      rolePriest: 'Священникъ',
+      roleReader: 'Чтецъ',
+      roleAuto: 'Авто',
+      serviceNames: {
+        primes: 'Первый часъ',
+        third: 'Третий часъ',
+        sixth: 'Шестой часъ',
+        ninth: 'Девятый часъ',
+        vespers: 'Вечерня',
+        liturgy: 'Божественная Литургия',
+        royalhours: 'Царскія часъ',
+        compline: 'Повечерiе',
+      },
+      serviceDescriptions: {
+        primes: 'Часъ первый',
+        third: 'Часъ третий',
+        sixth: 'Часъ шестой',
+        ninth: 'Часъ девятый',
+        vespers: 'Вечернее богослуженiе (Вечерня)',
+        liturgy: 'Главное богослуженiе (Божественнаꙗ Литургiꙗ)',
+        royalhours: 'Царскія часъ',
+        compline: 'Ночное богослуженiе (Повечерiе)',
+      },
+    },
+
+    bible: {
+      selectBook: 'Изберете книгу',
+      selectChapter: 'Изберете главу',
+      read: 'Читати',
+      loading: 'Загрузка...',
+      noTextFound: 'Текстъ не найденъ для сего отрывка.',
+      notAvailableOffline: 'Текстъ недоступенъ для просмотра въ автономномъ режиме.',
+      ensureDataConverted: 'Файлы библейскаго текста загружаются по требованiю. Убедитесь, что данные сконвертированы и доступны.',
+    },
+
+    settings: {
+      title: 'Настройки',
+      language: 'Языкъ интерфейса',
+      fontSettings: 'Шрифтъ церковнославянскаго',
+      usePonomarFont: 'Использовать шрифтъ Понома́рь для церковнославянскихъ текстовъ',
+      usePonomarFontDesc: 'Использовать шрифтъ Понома́рь для церковнославянскихъ текстовъ',
+      fontPreview: 'Предпросмотръ:',
+      fontPreviewNoteActive: 'Шрифтъ Понома́рь активенъ — иконы чинѣвъ будутъ отображатися правильно',
+      fontPreviewNoteInactive: 'Системный шрифтъ активенъ — иконы чинѣвъ будутъ использовать Понома́рь въ любомъ случаи',
+      fontSize: 'Размеръ литургическаго текста: ',
+      systemFont: 'Системный шрифтъ',
+      bibleSettings: 'Библия',
+      defaultTranslation: 'Переводъ по умолчанiю',
+      showVerseNumbers: 'Показывать номера стиховъ',
+      verseNewLine: 'Каждый стихъ съ новыя строки',
+      bibleComments: {
+        fullBible: 'Полная Библія',
+        ntOnly: 'Новый Завѣтъ',
+        otOnly: 'Ветхій Завѣтъ',
+        otProphets: 'Пророцы',
+      },
+      calendarType: 'Календарь по умолчанию',
+      julian: 'Юліанскій',
+      gregorian: 'Григоріанскій',
+      about: 'О Понома́ри',
+      aboutText: 'Понома́рь — приложенiе православнаго календаря, предоставляющее литургическiю информацию, тексты службъ и библейскія чтения на нескольких языкахъ.',
+      aboutLicense: 'Основано на Java-приложенiи Понома́рь отъ Александра Андреева и Юрия Шардт. Лицензия GPL v3.',
+      installPwa: 'Оустановити Понома́рь',
+    },
+
+    common: {
+      priest: 'Свящ.',
+      reader: 'Чтецъ',
+      deacon: 'Диаконъ',
+      choir: 'Хоръ',
+      all: 'Все',
+    },
+  },
+};
+
+/**
+ * Get translations for a specific language.
+ * Falls back to English if language not found.
+ */
+export function getTranslations(lang: LanguageCode): Translations {
+  return translations[lang] || translations.en;
+}
+
+/**
+ * Get a specific translation key with fallback.
+ */
+export function t(lang: LanguageCode, key: string, ...args: string[]): string {
+  const tr = getTranslations(lang);
+  const keys = key.split('.');
+  let value: unknown = tr;
+
+  for (const k of keys) {
+    if (value && typeof value === 'object' && k in value) {
+      value = (value as Record<string, unknown>)[k];
+    } else {
+      // Fallback to English
+      value = translations.en;
+      for (const k2 of keys) {
+        if (value && typeof value === 'object' && k2 in value) {
+          value = (value as Record<string, unknown>)[k2];
+        } else {
+          return key; // Return key if not found
+        }
+      }
+      break;
+    }
+  }
+
+  if (typeof value === 'string') {
+    return args.length > 0 ? value.replace(/{(\d+)}/g, (_, i) => args[i] ?? '') : value;
+  }
+
+  return key;
+}
\ No newline at end of file
diff --git a/src/core/jdate.ts b/src/core/jdate.ts
new file mode 100644
index 0000000..aa95076
--- /dev/null
+++ b/src/core/jdate.ts
@@ -0,0 +1,183 @@
+/**
+ * JDate — Julian calendar date engine.
+ * Faithful port of Ponomar/JDate.java to TypeScript.
+ * All dates are Julian calendar. Internally stored as Julian Day Number (JDN).
+ *
+ * JDate.java is part of the Ponomar program.
+ * Copyright 2006, 2007 Aleksandr Andreev.
+ * GPL v3 — see LICENSE.
+ */
+
+const DAYS_IN_MONTH = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+const DAYS_IN_MONTH_LEAP = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+
+/**
+ * 1-based modulo. If result is 0, returns divisor.
+ * Matches Java JDate.mod() exactly.
+ */
+function mod1(divisor: number, modulo: number): number {
+  let temp = divisor % modulo;
+  if (temp === 0) temp = modulo;
+  return temp;
+}
+
+export class JDate {
+  readonly jdn: number;
+
+  /** Create from Julian month/day/year. */
+  constructor(monthOrJdn: number, day?: number, year?: number) {
+    if (day === undefined && year === undefined) {
+      // Constructor from JDN
+      this.jdn = monthOrJdn;
+      return;
+    }
+
+    const month = monthOrJdn;
+    if (month < 1 || month > 12) throw new Error(`Invalid month: ${month}`);
+    if (day! < 0) throw new Error(`Invalid day: ${day}`);
+
+    const leap = year! % 4 === 0;
+    const maxDays = leap ? DAYS_IN_MONTH_LEAP[month - 1] : DAYS_IN_MONTH[month - 1];
+    if (day! > maxDays) throw new Error(`Invalid day ${day} for month ${month} (year ${year})`);
+
+    // Fliegel-Van Flandern formula (Julian calendar)
+    const a = Math.floor((14 - month) / 12);
+    const y = year! + 4800 - a;
+    const m = month + 12 * a - 3;
+    this.jdn = day! + Math.floor((153 * m + 2) / 5) + 365 * y + Math.floor(y / 4) - 32083;
+  }
+
+  /** Create from JavaScript Date (Gregorian). Converts to Julian calendar. */
+  static fromGregorian(date: Date): JDate {
+    return JDate.fromGregorianParts(date.getFullYear(), date.getMonth() + 1, date.getDate());
+  }
+
+  /** Create from Gregorian year/month/day. */
+  static fromGregorianParts(gYear: number, gMonth: number, gDay: number): JDate {
+    const a = Math.floor((14 - gMonth) / 12);
+    const y = gYear + 4800 - a;
+    const m = gMonth + 12 * a - 3;
+    const jd = gDay + Math.floor((153 * m + 2) / 5) + 365 * y + Math.floor(y / 4) - Math.floor(y / 100) + Math.floor(y / 400) - 32045;
+    return new JDate(jd);
+  }
+
+  /** Create from today's date. */
+  static today(): JDate {
+    return JDate.fromGregorian(new Date());
+  }
+
+  /** Get year (Julian calendar). */
+  getYear(): number {
+    const jbar = this.jdn + 32083;
+    const n1 = Math.floor(jbar / 1461) * 4;
+    const n2 = Math.floor((jbar % 1461) / 365);
+    const da = jbar % 1461;
+    const adj = (da % 365) > 306 ? 1 : 0;
+    return Math.floor(n1 + n2) - 4800 + adj;
+  }
+
+  /** Get month (1=Jan ... 12=Dec, Julian calendar). */
+  getMonth(): number {
+    const jbar = this.jdn + 32083;
+    const da = jbar % 1461;
+    let m = mod1(da, 365);
+    let j = 2;
+    while (m > DAYS_IN_MONTH_LEAP[j]) {
+      m -= DAYS_IN_MONTH_LEAP[j];
+      j++;
+      if (j === 12) j = 0;
+    }
+    return j + 1;
+  }
+
+  /** Get day of month (Julian calendar). */
+  getDay(): number {
+    const jbar = this.jdn + 32083;
+    const da = mod1(jbar, 1461);
+    if (da === 1461) return 29; // Feb 29
+    let m = mod1(da, 365);
+    let k = 2;
+    while (m > DAYS_IN_MONTH[k]) {
+      m -= DAYS_IN_MONTH[k];
+      k++;
+      if (k === 12) k = 0;
+    }
+    return m;
+  }
+
+  /** Day of week: 0=Sunday, 1=Monday, ..., 6=Saturday. */
+  getDayOfWeek(): number {
+    let temp = (this.jdn % 7) + 1;
+    if (temp === 7) temp = 0;
+    return temp;
+  }
+
+  /** Day of year: 0=Jan 1, ..., 364/365=Dec 31. */
+  getDoy(): number {
+    const jbar = this.jdn + 32083;
+    const da = jbar % 1461;
+    return da === 1461 ? 366 : mod1(da + 59, 365) - 1;
+  }
+
+  /** Convert to JavaScript Date (Gregorian calendar). */
+  toGregorian(): Date {
+    let j1: number;
+    if (this.jdn >= 2299160.5) {
+      const tmp = Math.floor(((this.jdn - 1867216.0) - 0.25) / 36524.25);
+      j1 = this.jdn + 1 + tmp - Math.floor(0.25 * tmp);
+    } else {
+      j1 = this.jdn;
+    }
+    const j2 = j1 + 1524.0;
+    const j3 = Math.floor(6680.0 + ((j2 - 2439870.0) - 122.1) / 365.25);
+    const j4 = Math.floor(j3 * 365.25);
+    const j5 = Math.floor((j2 - j4) / 30.6001);
+    let d = Math.floor(j2 - j4 - Math.floor(j5 * 30.6001));
+    let m = Math.floor(j5 - 1.0);
+    if (m > 12) m -= 12;
+    let y = Math.floor(j3 - 4715.0);
+    if (m > 2) --y;
+    if (y <= 0) --y;
+    return new Date(y, m - 1, d);
+  }
+
+  /** Days to add to get to another date. Positive if this > other. */
+  difference(other: JDate): number {
+    return this.jdn - other.jdn;
+  }
+
+  /** Add n days, returning a new JDate. */
+  addDays(n: number): JDate {
+    return new JDate(this.jdn + n);
+  }
+
+  /** Subtract n days, returning a new JDate. */
+  subtractDays(n: number): JDate {
+    return new JDate(this.jdn - n);
+  }
+
+  /** Days in month for this date's month/year. */
+  static maxDaysInMonth(month: number, year: number): number {
+    return (year % 4 === 0) ? DAYS_IN_MONTH_LEAP[month - 1] : DAYS_IN_MONTH[month - 1];
+  }
+
+  equals(other: JDate): boolean {
+    return this.jdn === other.jdn;
+  }
+
+  compareTo(other: JDate): number {
+    return this.jdn - other.jdn;
+  }
+
+  toString(): string {
+    const y = this.getYear();
+    const m = this.getMonth();
+    const d = this.getDay();
+    return `${m < 10 ? '0' + m : m}/${d < 10 ? '0' + d : d}/${y}`;
+  }
+
+  /** Clone — returns a new JDate with the same JDN. */
+  clone(): JDate {
+    return new JDate(this.jdn);
+  }
+}
diff --git a/src/core/paschalion.ts b/src/core/paschalion.ts
new file mode 100644
index 0000000..656ebf0
--- /dev/null
+++ b/src/core/paschalion.ts
@@ -0,0 +1,257 @@
+/**
+ * Paschalion — Orthodox Church paschal and feast day computations.
+ * Faithful port of Ponomar/Paschalion.java to TypeScript.
+ *
+ * Paschalion.java is part of the Ponomar program.
+ * Copyright 2006, 2007 Aleksandr Andreev.
+ * GPL v3 — see LICENSE.
+ */
+
+import { JDate } from './jdate';
+
+const LUNAR_MONTH = 29.52916667;
+
+/** Age of the moon on March 1 for each year in the 19-year Metonic cycle (hours since midnight). */
+const FOUNDATION = [
+  14.042016807, 25.462184874, 6.084033613, 17.966386555, 28.336134454,
+  9.210084034, 20.504201681, 1.420168067, 12.294117647, 23.168067227,
+  4.546218487, 15.042016807, 26.294117647, 7.630252101, 18.546218487,
+  29.420168067, 11.756302521, 26.210084034, 3.042016807,
+];
+
+/** 1-based modulo. If result is 0, returns divisor. */
+function mod1(divisor: number, modulo: number): number {
+  let temp = divisor % modulo;
+  if (temp === 0) temp = modulo;
+  return temp;
+}
+
+/** Modulo for decimal numbers. */
+function modF(divisor: number, modulo: number): number {
+  return divisor - Math.floor(divisor / modulo) * modulo;
+}
+
+export const Paschalion = {
+  /**
+   * Get the date of Julian Pascha (Easter) for a given year.
+   * Uses Gaussian Easter formulae.
+   */
+  getPascha(year: number): JDate {
+    if (year < 33) throw new Error('Invalid year');
+    const a = year % 4;
+    const b = year % 7;
+    const c = year % 19;
+    const d = (19 * c + 15) % 30;
+    const e = (2 * a + 4 * b - d + 34) % 7;
+    const month = Math.floor((d + e + 114) / 31); // 3=March, 4=April
+    const day = ((d + e + 114) % 31) + 1;
+    return new JDate(month, day, year);
+  },
+
+  /** Pentecost: Pascha + 49 days. */
+  getPentecost(year: number): JDate {
+    return this.getPascha(year).addDays(49);
+  },
+
+  /** Clean Monday (Great Lent starts): Pascha - 48 days. */
+  getLentStart(year: number): JDate {
+    return this.getPascha(year).subtractDays(48);
+  },
+
+  /** Apostles' Fast starts: Pascha + 57 days (Monday after All Saints). */
+  getApostlesFastStart(year: number): JDate {
+    return this.getPascha(year).addDays(57);
+  },
+
+  /** Length of Apostles' Fast in days. Ends June 28 (Julian). */
+  getApostlesFastLength(year: number): number {
+    const start = this.getApostlesFastStart(year);
+    const end = new JDate(6, 28, year);
+    return end.difference(start);
+  },
+
+  /** Key of Boundaries (Ключ границ) — letter of the Paschal boundary. 1-30. */
+  getKeyOfBoundaries(year: number): number {
+    const date = this.getPascha(year);
+    const m = date.getMonth();
+    let g = date.getDay();
+    if (m === 3) {
+      g -= 21;
+    } else {
+      g += 10;
+    }
+    return g;
+  },
+
+  /** Indiction cycle. */
+  getIndiction(year: number): number {
+    if (year < 33) throw new Error('Invalid year');
+    return mod1(year - 312, 15);
+  },
+
+  /** Solar cycle. */
+  getSolarCycle(year: number): number {
+    if (year < 33) throw new Error('Invalid year');
+    return mod1(year + 5508, 28);
+  },
+
+  /** Lunar cycle (1-19). */
+  getLunarCycle(year: number): number {
+    if (year < 33) throw new Error('Invalid year');
+    let temp = (year + 1) % 19 - 3;
+    if (temp <= 0) temp += 19;
+    return temp;
+  },
+
+  /** Lunar phase for a date: 0=new moon, 0.5=full moon. */
+  getLunarPhase(date: JDate): number {
+    const year = date.getYear();
+    const cycle = this.getLunarCycle(year);
+    let diff = date.difference(new JDate(3, 1, year));
+    if (diff < 0) {
+      diff = date.difference(new JDate(3, 1, year - 1));
+    }
+    let remainder = modF(diff, LUNAR_MONTH);
+    remainder += FOUNDATION[cycle - 1];
+    while (remainder >= LUNAR_MONTH) {
+      remainder -= LUNAR_MONTH;
+    }
+    return remainder / LUNAR_MONTH;
+  },
+
+  /**
+   * Annual fasting array: 0=no fast, 1=fast day, 2=cheesefare.
+   * One entry per day of the year (index 0=Jan 1).
+   */
+  getFasts(year: number): number[] {
+    if (year < 33) throw new Error('Invalid year');
+
+    const pascha = this.getPascha(year);
+    const numDays = (year % 4 === 0) ? 366 : 365;
+
+    // Mandatory fast days (JDN → reason string)
+    const mustFast = new Set<number>();
+    mustFast.add(new JDate(1, 5, year).jdn);
+    mustFast.add(new JDate(8, 29, year).jdn);
+    mustFast.add(new JDate(9, 14, year).jdn);
+
+    // Mandatory fast-free days
+    const cantFast = new Set<number>();
+    cantFast.add(new JDate(1, 6, year).jdn);
+
+    // Period boundaries
+    const SVIATKI_START = new JDate(12, 25, year);
+    const SVIATKI_END = new JDate(1, 4, year);
+    const PUB_PHAR_START = pascha.subtractDays(70);
+    const PUB_PHAR_END = pascha.subtractDays(63);
+    const CHEESE_START = pascha.subtractDays(55);
+    const CHEESE_END = pascha.subtractDays(49);
+    const LENT_START = pascha.subtractDays(48);
+    const LENT_END = pascha.subtractDays(1);
+    const BRIGHT_START = pascha;
+    const BRIGHT_END = pascha.addDays(6);
+    const PENT_START = pascha.addDays(49);
+    const PENT_END = pascha.addDays(56);
+    const APOSTLES_START = pascha.addDays(57);
+    const APOSTLES_END = new JDate(6, 28, year);
+    const DORM_START = new JDate(8, 1, year);
+    const DORM_END = new JDate(8, 14, year);
+    const ADVENT_START = new JDate(11, 15, year);
+    const ADVENT_END = new JDate(12, 24, year);
+
+    const retval = new Array<number>(numDays);
+    let dummy = new JDate(1, 1, year);
+
+    for (let i = 0; i < numDays; i++) {
+      let fast = 0;
+      const jdn = dummy.jdn;
+
+      if (mustFast.has(jdn)) {
+        fast = 1;
+      } else if (cantFast.has(jdn)) {
+        fast = 0;
+      } else if (dummy.compareTo(SVIATKI_START) >= 0 || dummy.compareTo(SVIATKI_END) <= 0) {
+        fast = 0;
+      } else if (dummy.compareTo(PUB_PHAR_START) >= 0 && dummy.compareTo(PUB_PHAR_END) <= 0) {
+        fast = 0;
+      } else if (dummy.compareTo(CHEESE_START) >= 0 && dummy.compareTo(CHEESE_END) <= 0) {
+        fast = 2;
+      } else if (dummy.compareTo(LENT_START) >= 0 && dummy.compareTo(LENT_END) <= 0) {
+        fast = 1;
+      } else if (dummy.compareTo(BRIGHT_START) >= 0 && dummy.compareTo(BRIGHT_END) <= 0) {
+        fast = 0;
+      } else if (dummy.compareTo(PENT_START) >= 0 && dummy.compareTo(PENT_END) <= 0) {
+        fast = 0;
+      } else if (dummy.compareTo(APOSTLES_START) >= 0 && dummy.compareTo(APOSTLES_END) <= 0) {
+        fast = 1;
+      } else if (dummy.compareTo(DORM_START) >= 0 && dummy.compareTo(DORM_END) <= 0) {
+        fast = 1;
+      } else if (dummy.compareTo(ADVENT_START) >= 0 && dummy.compareTo(ADVENT_END) <= 0) {
+        fast = 1;
+      } else {
+        const dow = dummy.getDayOfWeek();
+        if (dow === 3 || dow === 5) fast = 1;
+      }
+
+      retval[i] = fast;
+      dummy = dummy.addDays(1);
+    }
+
+    return retval;
+  },
+
+  /**
+   * Major feasts for the year.
+   * Returns Map< JDN, feastName >.
+   */
+  getFeasts(year: number): Map<number, string> {
+    if (year < 33) throw new Error('Invalid year');
+
+    const feastNames = [
+      'New Year', 'Theophany', 'Nativity of the Forerunner',
+      'Peter and Paul', 'Transfiguration', 'Dormition',
+      'Beheading of the Forerunner', 'Nativity of the Theotokos',
+      'Exaltation of the Cross', 'Protection of the Theotokos',
+      'Entrance of the Theotokos', 'Nativity of Christ',
+      'Pascha and Annunciation', 'Pascha', 'Annunciation',
+      'Pentecost', 'Ascension', 'Palm Sunday', 'Meeting of the Lord',
+    ];
+
+    const feasts = new Map<number, string>();
+
+    // Fixed feasts
+    feasts.set(new JDate(1, 1, year).jdn, feastNames[0]);
+    feasts.set(new JDate(1, 6, year).jdn, feastNames[1]);
+    feasts.set(new JDate(6, 24, year).jdn, feastNames[2]);
+    feasts.set(new JDate(6, 29, year).jdn, feastNames[3]);
+    feasts.set(new JDate(8, 6, year).jdn, feastNames[4]);
+    feasts.set(new JDate(8, 15, year).jdn, feastNames[5]);
+    feasts.set(new JDate(8, 29, year).jdn, feastNames[6]);
+    feasts.set(new JDate(9, 8, year).jdn, feastNames[7]);
+    feasts.set(new JDate(9, 14, year).jdn, feastNames[8]);
+    feasts.set(new JDate(10, 1, year).jdn, feastNames[9]);
+    feasts.set(new JDate(11, 21, year).jdn, feastNames[10]);
+    feasts.set(new JDate(12, 25, year).jdn, feastNames[11]);
+
+    // Moveable feasts
+    const pascha = this.getPascha(year);
+    if (pascha.equals(new JDate(3, 25, year))) {
+      feasts.set(pascha.jdn, feastNames[12]);
+    } else {
+      feasts.set(pascha.jdn, feastNames[13]);
+      feasts.set(new JDate(3, 25, year).jdn, feastNames[14]);
+    }
+    feasts.set(pascha.addDays(49).jdn, feastNames[15]);
+    feasts.set(pascha.addDays(39).jdn, feastNames[16]);
+    feasts.set(pascha.subtractDays(7).jdn, feastNames[17]);
+
+    // Meeting of the Lord — Feb 2, but transferred to Forgiveness Sunday if it falls on Clean Monday
+    let meeting = new JDate(2, 2, year);
+    if (pascha.difference(meeting) === 48) {
+      meeting = meeting.subtractDays(1);
+    }
+    feasts.set(meeting.jdn, feastNames[18]);
+
+    return feasts;
+  },
+};
diff --git a/src/core/service-assembler.ts b/src/core/service-assembler.ts
new file mode 100644
index 0000000..3d35c14
--- /dev/null
+++ b/src/core/service-assembler.ts
@@ -0,0 +1,597 @@
+/**
+ * Service Assembler — recursive template processor for liturgical services.
+ * Processes service XML templates (pre-converted to JSON) and renders HTML.
+ *
+ * Service.java is part of the Ponomar program.
+ * Copyright 2008, 2009, 2011 Yuri Shardt.
+ * See LICENSE for redistribution terms.
+ */
+
+import { evalBool } from './evaluator';
+import type { EvalContext, ServiceNode } from './types';
+
+export interface CommonTranslations {
+  priest: string;
+  reader: string;
+  deacon: string;
+  choir: string;
+}
+
+export interface ServiceContext {
+  evalCtx: EvalContext;
+  lang: string;
+  fetchText: (path: string) => Promise<string | null>;
+  fetchServiceNodes: (path: string) => Promise<ServiceNode[] | null>;
+  fetchBibleText: (book: string, passage: string, showVerseNumbers?: boolean, verseNewLine?: boolean) => Promise<string>;
+  fetchLives: (id: string) => Promise<Record<string, Record<string, Record<string, unknown>>> | null>;
+  fetchCommandText: (name: string) => Promise<string>;
+  resolveTimes: (times: number) => Promise<string>;
+  t?: { common: CommonTranslations };
+}
+
+function localizeWho(who: string, ctx: ServiceContext): string {
+  const t = ctx.t?.common;
+  if (!t) return who;
+  const map: Record<string, string | undefined> = {
+    P: t.priest,
+    Priest: t.priest,
+    R: t.reader,
+    Reader: t.reader,
+    SR: t.reader,
+    D: t.deacon,
+    Deacon: t.deacon,
+    C: t.choir,
+    Choir: t.choir,
+  };
+  return map[who] ?? who;
+}
+
+// Localized reading intro names (getreading case)
+// Values from Java bible.xml Intro field
+const READING_NAMES: Record<string, Record<string, string>> = {
+  en: {
+    Isa: 'A reading from the Prophecy of Isaiah',
+    Mica: 'A reading from the Prophecy of Micah',
+    Zech: 'A reading from the Prophecy of Zechariah',
+    Jerem: 'A reading from the Prophecy of Jeremiah',
+    Baruch: 'A reading from the Prophecy of Jeremiah',
+    Mal: 'A reading from the Prophecy of Malachi',
+    Zeph: 'A reading from the Prophecy of Zephaniah',
+    Mt: 'A reading from the Holy Gospel according to Matthew',
+    Mk: 'A reading from the Holy Gospel according to Mark',
+    Lk: 'A reading from the Holy Gospel according to Luke',
+    Jn: 'A reading from the Holy Gospel according to John',
+    Acts: 'A reading from the Acts of the Apostles',
+    Rom: 'A reading from the Epistle of Paul to the Romans',
+    Gal: 'A reading from the Epistle of Paul to the Galatians',
+    Tit: 'A reading from the Epistle to Titus',
+    Heb: 'A reading from the Epistle to the Hebrews',
+  },
+  cu: {
+    Isa: 'Прⷪ҇ро́чества и҆са́їина чте́нїе',
+    Mica: 'Прⷪ҇ро́чества мїхе́ина чте́нїе',
+    Zech: 'Прⷪ҇ро́чества заха́рїина чте́нїе',
+    Jerem: 'Прⷪ҇ро́чества і҆еремі́ина чте́нїе',
+    Baruch: 'Прⷪ҇ро́чества і҆еремі́ина чте́нїе',
+    Mal: 'Прⷪ҇ро́чества малахі́ина чте́нїе',
+    Zeph: 'Прⷪ҇ро́чества софо́нїева чте́нїе',
+    Mt: 'Ѿ матѳе́а ст҃а́гѡ є҆ѵⷢ҇лїа чте́нїе',
+    Mk: 'Ѿ ма́рка ст҃а́гѡ є҆ѵⷢ҇лїа чте́нїе',
+    Lk: 'Ѿ лꙋкѝ ст҃а́гѡ є҆ѵⷢ҇лїа чте́нїе',
+    Jn: 'Ѿ і҆ѡа́нна ст҃а́гѡ є҆ѵⷢ҇лїа чте́нїе',
+    Acts: 'Дѣѧ̑нїй ст҃ы́хъ а҆пⷭ҇лъ чте́нїе',
+    Rom: 'Къ ри́млѧнѡмъ посла́нїѧ ст҃гѡ а҆пⷭ҇ла па́ѵла чте́нїе',
+    Gal: 'Къ гала́тѡмъ посла́нїѧ ст҃гѡ а҆пⷭ҇ла па́ѵла чте́нїе',
+    Tit: 'Къ ті́тꙋ посла́нїѧ ст҃гѡ а҆пⷭ҇ла па́ѵла чте́нїе',
+    Heb: 'Ко є҆вре́ємъ посла́нїѧ ст҃гѡ а҆пⷭ҇ла па́ѵла чте́нїе',
+  },
+  fr: {
+    Isa: 'Une lection d\'Ésaïe',
+    Mica: 'Une lection de la prophétie de Michée',
+    Zech: 'Une lection de la prophétie de Zacharie',
+    Jerem: 'Une lection de la prophétie de Jérémie',
+    Baruch: 'Une lection de la prophétie de Jérémie',
+    Mal: 'Une lection de la prophétie de Malachie',
+    Zeph: 'Une lection de la prophétie de Sophonie',
+    Mt: 'Une lection du Saint Évangile selon Saint Matthieu',
+    Mk: 'Une lection du Saint Évangile selon Saint Marc',
+    Lk: 'Une lection du Saint Évangile selon Saint Luc',
+    Jn: 'Une lection du Saint Évangile selon Saint Jean',
+    Acts: 'Une lection des Actes des Apôtres',
+    Rom: 'Une lection de l\'Épître de Paul aux Romains',
+    Gal: 'Une lection de l\'Épître de Paul aux Galates',
+    Tit: 'Une lection de l\'Épître de Paul au Tite',
+    Heb: 'Une lection de l\'Épître de Paul aux Hébreux',
+  },
+  el: {
+    Isa: 'Προφητείας Ἡσαΐου τὸ Ἀνάγνωσμα',
+    Mica: 'Προφητείας Μιχαίου τὸ Ἀνάγνωσμα',
+    Zech: 'Προφητείας Ζαχαρίου τὸ Ἀνάγνωσμα',
+    Jerem: 'Προφητείας Ἱερεμίου τὸ Ἀνάγνωσμα',
+    Baruch: 'Προφητείας Ἱερεμίου τὸ Ἀνάγνωσμα',
+    Mal: 'Προφητείας Μαλαχίου τὸ ἀνάγνωσμα',
+    Zeph: 'Προφητείας Σοφονίου τὸ Ἀνάγνωσμα',
+    Mt: 'Εὐαγγέλιον ἐκ τοῦ κατὰ Ματθαῖον',
+    Mk: 'Εὐαγγέλιον ἐκ τοῦ κατὰ Μᾶρκον',
+    Lk: 'Εὐαγγέλιον ἐκ τοῦ κατὰ Λουκᾶν',
+    Jn: 'Εὐαγγέλιον ἐκ τοῦ κατὰ Ἰωάννην',
+    Acts: 'Πράξεων τῶν Ἀποστολων',
+    Rom: 'Πρὸς Ῥωμαίους Ἐπιστολῆς Παύλου τὸ Ἀνάγνωσμα',
+    Gal: 'Πρὸς Γαλάτας ἐπιστολῆς Παύλου τὸ Ἀνάγνωσμα',
+    Tit: 'Πρὸς Τίτον ἐπιστολῆς Παύλου τὸ Ἀνάγνωσμα',
+    Heb: 'Πρὸς Ἑβραίους Ἐπιστολῆς Παύλου τὸ Ἀνάγνωσμα',
+  },
+};
+
+// Localized book names for passage headers
+const HEADER_NAMES: Record<string, Record<string, string>> = {
+  en: {
+    Psalm: 'Psalm', Isa: 'Isaiah', Jr: 'Jeremiah', Jerem: 'Jeremiah',
+    Ez: 'Ezekiel', Dn: 'Daniel', Mic: 'Micah', Mica: 'Micah',
+    Na: 'Nahum', Hab: 'Habakkuk', Zeph: 'Zephaniah', Hag: 'Haggai',
+    Zech: 'Zechariah', Mal: 'Malachi', Mt: 'Matthew', Mk: 'Mark',
+    Lk: 'Luke', Jn: 'John', Rom: 'Romans', Heb: 'Hebrews',
+    Gal: 'Galatians', Acts: 'Acts', Baruch: 'Baruch',
+  },
+  cu: {
+    Psalm: 'Ѱалти́рь', Isa: 'И҆са́їи', Jr: 'І҆еремі́и', Jerem: 'І҆еремі́и',
+    Ez: 'І҆езекі́ль', Dn: 'Дані́илъ', Mic: 'Мїхе́й', Mica: 'Мїхе́й',
+    Na: 'Наꙋ́мъ', Hab: 'Аввакꙋ́мъ', Zeph: 'Софо́нїа', Hag: 'Аггѣ́й',
+    Zech: 'Заха́рїа', Mal: 'Малахі́а', Mt: 'Ѿ Матѳе́а', Mk: 'Ѿ Ма́рка',
+    Lk: 'Ѿ лꙋкѝ', Jn: 'Ѿ і҆ѡа́нна', Rom: 'Къ ри́млѧнѡмъ', Heb: 'Ко є҆вре́ємъ',
+    Gal: 'Къ гала́тѡмъ', Acts: 'Дѣѧ̑нїѧ ст҃ы́хъ а҆пⷭ҇лъ', Baruch: 'Варꙋ́хъ',
+  },
+  fr: {
+    Psalm: 'Psaumes', Isa: 'Isaïe / Ésaïe', Jr: 'Jérémie', Jerem: 'Jérémie',
+    Ez: 'Ézéchiel', Dn: 'Daniel', Mic: 'Michée', Mica: 'Michée',
+    Na: 'Nahum', Hab: 'Habacuc', Zeph: 'Sophonie', Hag: 'Aggée',
+    Zech: 'Zacharie', Mal: 'Malachie', Mt: 'Matthieu', Mk: 'Marc',
+    Lk: 'Luc', Jn: 'Jean', Rom: 'Romains', Heb: 'Hébreux',
+    Gal: 'Galates', Acts: 'Actes des Apôtres', Baruch: 'Baruch',
+  },
+  el: {
+    Psalm: 'Ψαλμοί', Isa: 'Ἡσαΐας', Jr: 'Ἱερεμίας', Jerem: 'Ἱερεμίας',
+    Ez: 'Ἰεζεκιήλ', Dn: 'Δανιήλ', Mic: 'Μιχαίας', Mica: 'Μιχαίας',
+    Na: 'Ναούμ', Hab: 'Ἀμβακούμ', Zeph: 'Σοφονίας', Hag: 'Ἀγγαῖος',
+    Zech: 'Ζαχαρίας', Mal: 'Μαλαχίας', Mt: 'Εὐαγγέλιον κατὰ Ματθαῖον', Mk: 'Εὐαγγέλιον κατὰ Μᾶρκον',
+    Lk: 'Εὐαγγέλιον κατὰ Λουκᾶν', Jn: 'Εὐαγγέλιον κατὰ Ἰωάννην',
+    Rom: 'Πρὸς Ῥωμαίους', Heb: 'Πρὸς Ἑβραίους',
+    Gal: 'Πρὸς Γαλάτας', Acts: 'Πράξεων τῶν Ἀποστολων', Baruch: 'Βαρούχ',
+  },
+};
+
+function getReadingName(bookId: string, lang: string): string {
+  const lookupLang = lang === 'ru' ? 'cu' : lang;
+  const map = READING_NAMES[lookupLang] ?? READING_NAMES.en;
+  return map[bookId] ?? bookId;
+}
+
+function getHeaderName(bookId: string, lang: string): string {
+  const lookupLang = lang === 'ru' ? 'cu' : lang;
+  const map = HEADER_NAMES[lookupLang] ?? HEADER_NAMES.en;
+  return map[bookId] ?? bookId;
+}
+
+interface ImplementOptions {
+  header?: string;
+  who: string;
+  command?: string;
+  commandB?: string;
+  commandText?: string;
+  commandBText?: string;
+  timesText?: string;
+  redFirst?: boolean;
+  newLine?: boolean;
+  headerLevel?: number;
+}
+
+function str(v: unknown): string | undefined {
+  return typeof v === 'string' ? v : undefined;
+}
+function bool(v: unknown): boolean | undefined {
+  if (typeof v === 'boolean') return v;
+  if (v === '1' || v === 'true') return true;
+  if (v === '0' || v === 'false') return false;
+  return undefined;
+}
+function num(v: unknown): number | undefined {
+  if (typeof v === 'number') return v;
+  if (typeof v === 'string' && /^\d+$/.test(v)) return parseInt(v, 10);
+  return undefined;
+}
+
+/**
+ * Assemble a service from pre-parsed JSON template nodes.
+ * Returns HTML string.
+ */
+export async function assembleService(
+  nodes: ServiceNode[],
+  ctx: ServiceContext,
+  depth: number = 0
+): Promise<{ html: string; whoLast: string }> {
+  if (depth > 10) return { html: '<!-- Max recursion depth reached -->', whoLast: '\x00' };
+
+  let html = '';
+  let whoLast = '\x00';
+
+  // Buffer for grouping same-who lines into a single flex container
+  let groupWho: string | null = null;
+  let groupTexts: string[] = [];
+
+  function flushGroup() {
+    if (!groupWho || groupTexts.length === 0) return;
+    const linesHtml = groupTexts.map((t, i) => {
+      const redPart = extractFirstLetter(t);
+      const line = redPart
+        ? `<b><span class="text-red">${redPart}</span></b>${t.substring(redPart.length)}`
+        : t;
+      return (i > 0 ? '<br>' : '') + line;
+    }).join('');
+    html += `<div class="flex items-baseline gap-1"><b class="text-red shrink-0">${groupWho}:</b><span>${linesHtml}</span></div>\n`;
+    whoLast = groupWho;
+    groupWho = null;
+    groupTexts = [];
+  }
+
+  for (const raw of nodes) {
+    const n = raw as Record<string, unknown>;
+    const type = n.type as string;
+
+    // Evaluate Cmd attribute if present
+    const cmd = str(n.cmd);
+    if (cmd) {
+      if (!evalBool(cmd, ctx.evalCtx)) continue;
+    }
+
+    switch (type) {
+      case 'TITLE': {
+        flushGroup();
+        const value = str(n.value);
+        const source = str(n.source);
+        const comment = str(n.comment);
+        if (value) {
+          const titleText = await ctx.fetchText(`Services/Text/${value}.xml`);
+          if (titleText) html += `<h1 class="mt-4">${titleText}</h1>\n`;
+        }
+        if (source) {
+          const sourceText = await ctx.fetchText(`Services/Text/${source}.xml`);
+          if (sourceText) html += `<p class="text-red italic text-sm">${sourceText}</p>`;
+        }
+        if (comment) {
+          const commentText = await ctx.fetchText(`Services/Text/${comment}.xml`);
+          if (commentText) html += `<p class="italic text-sm">${commentText}</p>`;
+        }
+        break;
+      }
+
+      case 'SUBTITLE': {
+        flushGroup();
+        const value = str(n.value);
+        const comment = str(n.comment);
+        if (value) {
+          const subText = await ctx.fetchText(`Services/Text/${value}.xml`);
+          if (subText) html += `<h2 class="mt-4">${subText}</h2>\n`;
+        }
+        if (comment) {
+          const commentText = await ctx.fetchText(`Services/Text/${comment}.xml`);
+          if (commentText) html += `<p class="italic text-sm">${commentText}</p>`;
+        }
+        break;
+      }
+
+      case 'GET': {
+        flushGroup();
+        const file = str(n.file);
+        if (!file) break;
+        const subNodes = await ctx.fetchServiceNodes(`Services/${file}.xml`);
+        if (subNodes) {
+          const subResult = await assembleService(subNodes, ctx, depth + 1);
+          if (n.null && !subResult.html.trim()) {
+            // Null check: skip if empty
+          } else {
+            html += subResult.html;
+            whoLast = subResult.whoLast;
+          }
+        }
+        break;
+      }
+
+      case 'CREATE': {
+        const what = str(n.what) ?? '';
+        const whoRaw = str(n.who);
+        const who = whoRaw !== undefined ? localizeWho(whoRaw, ctx) : '';
+        let text = '';
+        let header = '';
+        if (what) {
+          text = await ctx.fetchText(`Services/CommonPrayers/${what}.xml`) ?? '';
+          // Fallback: if fetchText returns empty, try to use the 'what' field as a key
+          if (!text.trim()) {
+            text = what; // fallback to the key itself
+          }
+          header = await ctx.fetchText(`Services/CommonPrayers/${what}.xml.header`) ?? '';
+        }
+        const commandName = str(n.command);
+        const commandBName = str(n.commandB);
+        const timesVal = num(n.times);
+        const [commandText, commandBText, timesText] = await Promise.all([
+          commandName ? ctx.fetchCommandText(commandName) : Promise.resolve(''),
+          commandBName ? ctx.fetchCommandText(commandBName) : Promise.resolve(''),
+          timesVal ? ctx.resolveTimes(timesVal) : Promise.resolve(''),
+        ]);
+        const opts = {
+          who,
+          commandText: commandText || undefined,
+          commandBText: commandBText || undefined,
+          timesText: timesText || undefined,
+          redFirst: bool(n.redFirst),
+          newLine: bool(n.newLine),
+          headerLevel: n.header ? 1 : 0,
+        };
+        const fmt = formatServiceContent(text, opts);
+        const headerHtml = opts.headerLevel && header
+          ? `<h2 class="text-center text-red font-bold mt-4">${header}</h2>`
+          : '';
+        if (who) {
+          if (who !== groupWho || headerHtml) flushGroup();
+          if (headerHtml) html += headerHtml + '\n';
+          groupWho = who;
+          groupTexts.push(fmt);
+        } else {
+          flushGroup();
+          const br = opts.newLine ? '<br>' : '';
+          html += `${headerHtml}${br}<p>${fmt}</p>`;
+        }
+        if (whoRaw !== undefined) whoLast = who;
+        break;
+      }
+
+      case 'TEXT': {
+        const whoRaw = str(n.who);
+        const who = whoRaw !== undefined ? localizeWho(whoRaw, ctx) : '';
+        // Support both 'what' (programmatic nodes) and 'value' (converted JSON)
+        const textContent = str(n.what) ?? str(n.value) ?? '';
+        const opts = {
+          who,
+          redFirst: bool(n.redFirst),
+          newLine: bool(n.newLine),
+          headerLevel: n.header ? 1 : 0,
+        };
+        const fmt = formatServiceContent(textContent, opts);
+        if (who) {
+          if (who !== groupWho) flushGroup();
+          groupWho = who;
+          groupTexts.push(fmt);
+        } else {
+          flushGroup();
+          html += `<p>${fmt}</p>`;
+        }
+        if (whoRaw !== undefined) whoLast = who;
+        break;
+      }
+
+      case 'GETID': {
+        const whoRaw = str(n.who);
+        const who = whoRaw !== undefined ? localizeWho(whoRaw, ctx) : '';
+        let text = '';
+        let header = '';
+        const id = str(n.id);
+        const what = str(n.what);
+        const nodeType = str(n.type) ?? 'M';
+        if (id && what) {
+          const lifeId = nodeType === 'T' ? `98${id}` : id;
+          const lives = await ctx.fetchLives(lifeId);
+          if (lives) {
+            const lastSlash = what.lastIndexOf('/');
+            const nodePath = what.substring(0, lastSlash);
+            const typeKey = what.substring(lastSlash + 1);
+            const group = lives[nodePath];
+            if (group) {
+              const entry = group[typeKey];
+              if (entry) {
+                text = String(entry.text ?? '');
+                header = String(entry.Header ?? '');
+              }
+            }
+          }
+        }
+        const commandName = str(n.command);
+        const commandBName = str(n.commandB);
+        const timesVal = num(n.times);
+        const [commandText, commandBText, timesText] = await Promise.all([
+          commandName ? ctx.fetchCommandText(commandName) : Promise.resolve(''),
+          commandBName ? ctx.fetchCommandText(commandBName) : Promise.resolve(''),
+          timesVal ? ctx.resolveTimes(timesVal) : Promise.resolve(''),
+        ]);
+        const opts = {
+          who,
+          commandText: commandText || undefined,
+          commandBText: commandBText || undefined,
+          timesText: timesText || undefined,
+          redFirst: bool(n.redFirst),
+          newLine: bool(n.newLine),
+          headerLevel: n.header ? 1 : 0,
+        };
+        const fmt = formatServiceContent(text, opts);
+        const headerHtml = opts.headerLevel && header
+          ? `<h2 class="text-center text-red font-bold mt-4">${header}</h2>`
+          : '';
+        if (who) {
+          if (who !== groupWho || headerHtml) flushGroup();
+          groupWho = who;
+          if (headerHtml) html += headerHtml + '\n';
+          groupTexts.push(fmt);
+        } else {
+          flushGroup();
+          const br = opts.newLine ? '<br>' : '';
+          html += `${headerHtml}${br}<p>${fmt}</p>`;
+        }
+        if (whoRaw !== undefined) whoLast = who;
+        break;
+      }
+
+      case 'BIBLE': {
+        const whoRaw = str(n.who);
+        const who = whoRaw !== undefined ? localizeWho(whoRaw, ctx) : '';
+        const verseNewLine = !who;
+
+        // getreading: display a reading intro header (e.g. "Prophet Isaiah")
+        const getreading = str(n.getreading);
+        if (getreading && !str(n.verses)) {
+          flushGroup();
+          const bookName = getReadingName(getreading, ctx.lang);
+          const readingHeader = `<p class="italic">${bookName}</p>`;
+          html += readingHeader;
+          if (whoRaw !== undefined) whoLast = who;
+          break;
+        }
+        const verses = str(n.verses) ?? '';
+        const lastUnderscore = verses.lastIndexOf('_');
+        const book = lastUnderscore > 0 ? verses.substring(0, lastUnderscore) : verses;
+        const passage = lastUnderscore > 0 ? verses.substring(lastUnderscore + 1) : '';
+
+        // Generate header from book+passage when header=true and no twostars
+        let header = '';
+        if (n.header && !str(n.twostars)) {
+          const bookName = getHeaderName(book, ctx.lang);
+          header = passage ? `${bookName} ${passage}` : bookName;
+        }
+
+        let text = await ctx.fetchBibleText(book, passage, false, verseNewLine);
+
+        // Handle twostars: extract **-delimited instructions as header
+        const twostars = str(n.twostars);
+        if (twostars === '1' || twostars === '2') {
+          const starIdx = text.indexOf('**');
+          if (starIdx !== -1) {
+            const lastStar = text.lastIndexOf('**');
+            if (starIdx !== lastStar) {
+              const instruction = text.substring(starIdx + 2, lastStar);
+              if (twostars === '1') {
+                header = instruction;
+              } else if (twostars === '2') {
+                // Extract quoted text between ** markers
+                const quoteStart = instruction.indexOf('"');
+                if (quoteStart !== -1) {
+                  const quoteEnd = instruction.indexOf('"', quoteStart + 1);
+                  if (quoteEnd !== -1) {
+                    header = instruction.substring(quoteStart + 1, quoteEnd).replace(/\.\.\./g, '');
+                  }
+                }
+              }
+              // Strip ** markers from text
+              text = text.substring(0, starIdx) + text.substring(lastStar + 2);
+            }
+          }
+        }
+        // Strip all remaining ** markers
+        text = text.replace(/\*\*/g, '');
+
+        const commandName = str(n.command);
+        const commandBName = str(n.commandB);
+        const timesVal = num(n.times);
+        const [commandText, commandBText, timesText] = await Promise.all([
+          commandName ? ctx.fetchCommandText(commandName) : Promise.resolve(''),
+          commandBName ? ctx.fetchCommandText(commandBName) : Promise.resolve(''),
+          timesVal ? ctx.resolveTimes(timesVal) : Promise.resolve(''),
+        ]);
+        const opts = {
+          who,
+          commandText: commandText || undefined,
+          commandBText: commandBText || undefined,
+          timesText: timesText || undefined,
+          redFirst: verseNewLine ? false : bool(n.redFirst),
+          newLine: bool(n.newLine),
+          headerLevel: n.header ? 1 : 0,
+        };
+        const fmt = formatServiceContent(text, opts);
+        const headerHtml = opts.headerLevel && header
+          ? `<h2 class="text-center text-red font-bold mt-4">${header}</h2>`
+          : '';
+        if (who) {
+          if (who !== groupWho || headerHtml) flushGroup();
+          groupWho = who;
+          if (headerHtml) html += headerHtml + '\n';
+          groupTexts.push(fmt);
+        } else {
+          flushGroup();
+          if (verseNewLine) {
+            const verses = fmt.split('<br>').filter(Boolean);
+            const linesHtml = verses.map(v => {
+              const redPart = extractFirstLetter(v);
+              return redPart ? `<b><span class="text-red">${redPart}</span></b>${v.substring(redPart.length)}` : v;
+            }).join('<br>');
+            if (headerHtml) html += headerHtml + '\n';
+            html += `<p>${linesHtml}</p>`;
+          } else {
+            const br = opts.newLine ? '<br>' : '';
+            html += `${headerHtml}${br}<p>${fmt}</p>`;
+          }
+        }
+        if (whoRaw !== undefined) whoLast = who;
+        break;
+      }
+
+      case 'TIMES': {
+        flushGroup();
+        break;
+      }
+
+      default: {
+        flushGroup();
+        // Skip wrapper nodes that aren't real service elements
+        if (type === 'SERVICES' || type === 'TONE') break;
+        const children = n.children;
+        if (Array.isArray(children) && children.length > 0) {
+          const subHtml = await assembleService(children, ctx, depth + 1);
+          html += subHtml;
+        }
+        break;
+      }
+    }
+  }
+
+  flushGroup();
+  return { html, whoLast };
+}
+
+/**
+ * Format service text content: redFirst, command rubrics, commandB, times.
+ * Returns formatted HTML string (no wrapping in <p>).
+ */
+function formatServiceContent(text: string, opts: ImplementOptions): string {
+  let result = text;
+
+  if (opts.redFirst && result.length > 0) {
+    const redPart = extractFirstLetter(result);
+    if (redPart) {
+      result = `<b><span class="text-red">${redPart}</span></b>${result.substring(redPart.length)}`;
+    }
+  }
+
+  if (opts.commandText) {
+    if (opts.timesText) {
+      result += ` <span class="rubric">(${opts.timesText} ${opts.commandText})</span>`;
+    } else {
+      result += ` <span class="rubric">(${opts.commandText})</span>`;
+    }
+  } else if (opts.timesText) {
+    result += ` <span class="rubric">(${opts.timesText})</span>`;
+  }
+
+  if (opts.commandBText) {
+    result = `<span class="rubric">${opts.commandBText}</span> ${result}`;
+  }
+
+  return result;
+}
+
+function extractFirstLetter(text: string): string {
+  const combiningMarks = /[\u0300-\u036f\u037a\u0384-\u0385\u0483-\u0489\u1fbd-\u1ffe\u2de0-\u2dff\ua66f-\ua67d]/;
+  let result = text[0] || '';
+  let i = 1;
+  while (i < text.length && combiningMarks.test(text[i])) {
+    result += text[i];
+    i++;
+  }
+  return result;
+}
diff --git a/src/core/service-rules.ts b/src/core/service-rules.ts
new file mode 100644
index 0000000..e4172df
--- /dev/null
+++ b/src/core/service-rules.ts
@@ -0,0 +1,53 @@
+/**
+ * Service Rules — determines which service template to use for a given day.
+ * Port of Ponomar/ServiceInfo.java.
+ */
+
+import { evalBool } from './evaluator';
+import type { EvalContext } from './types';
+
+export interface ServiceRuleEntry {
+  type: string;
+  troparion?: string;
+  pickT?: number;
+  kontakion?: string;
+  pickK?: number;
+  lentenk?: number;
+  [key: string]: string | number | undefined;
+}
+
+export interface ServiceRulesData {
+  periods: {
+    cmd: string;
+    rules: {
+      type: string;
+      attrs: Record<string, string>;
+    }[];
+  }[];
+}
+
+/**
+ * Evaluate service rules for a given day.
+ * Returns the matching service configuration.
+ */
+export function evaluateServiceRules(
+  data: ServiceRulesData,
+  serviceType: string, // e.g., "VESPERS", "LITURGY", "MATINS"
+  ctx: EvalContext
+): ServiceRuleEntry | null {
+  let result: ServiceRuleEntry | null = null;
+
+  for (const period of data.periods) {
+    if (period.cmd && !evalBool(period.cmd, ctx)) {
+      continue;
+    }
+
+    for (const rule of period.rules) {
+      if (rule.type === serviceType) {
+        result = { type: rule.type, ...rule.attrs };
+      }
+    }
+  }
+
+  return result;
+}
diff --git a/src/core/types.ts b/src/core/types.ts
new file mode 100644
index 0000000..afc550e
--- /dev/null
+++ b/src/core/types.ts
@@ -0,0 +1,188 @@
+/**
+ * Shared type definitions for the Ponomar liturgical engine.
+ */
+
+/** All liturgical variables computed for a given day. */
+export interface DayInfo {
+  // Date components
+  dow: number;        // Day of week (0=Sun, 1=Mon, ..., 6=Sat)
+  doy: number;        // Day of year (0=Jan 1)
+  month: number;      // Julian calendar month (1-12)
+  day: number;        // Day of month
+  year: number;       // Julian calendar year
+
+  // Paschal cycle
+  nday: number;       // Days from this year's Pascha (- before, 0 = Pascha, + after)
+  ndayP: number;      // Days from last year's Pascha
+  ndayF: number;      // Days to next year's Pascha (negative before, 0 at next Pascha)
+  Easter: number;     // JDN of this year's Pascha
+  Pentecost: number;  // JDN of this year's Pentecost
+  LentStart: number;  // JDN of Clean Monday
+
+  // Liturgical state
+  Tone: number;       // Current Octoechos tone (1-8, -1 = none)
+  dRank: number;      // Liturgical rank (0-8, higher = more important)
+  PFlag: number;      // Paschal flag
+  PFlag1: number;     // Service inclusion flag
+  PFlag2: number;     // Service type (0=Normal, 1=Lenten, 2=Holy Week/Bright Week)
+  PS: number;         // Priest status (0=Reader, 1=Priest)
+
+  // Seasonal flags
+  isLent: boolean;
+  isBrightWeek: boolean;
+  isApostlesFast: boolean;
+  isDormitionFast: boolean;
+  isNativityFast: boolean;
+
+  // Data file references
+  triodionFile: number | null;    // Index in triodion (1-70)
+  pentecostarionFile: number | null; // Index in pentecostarion (1-315)
+}
+
+/** Expression evaluator variable store. */
+export type EvalContext = Record<string, number>;
+
+/** A saint/feast commemoration entry from monthly day XML. */
+export interface Commemoration {
+  sIds: string[];     // Saint IDs (comma-separated in source)
+  cId: string;        // Commemoration ID (points to lives/{cId}.xml)
+  src?: string;       // Source: G=Greek, R=Russian, U=Unsourced
+  tone?: string;      // Tone expression (evaluated at runtime)
+  cmd?: string;       // Conditional expression
+}
+
+/** A day's worth of commemoration data. */
+export interface DayData {
+  commemorations: Commemoration[];
+}
+
+/** Saint life data (from lives/{cId}.xml). */
+export interface SaintData {
+  name?: {
+    nominative: string;
+    short?: string;
+    genitive?: string;
+  };
+  grammar?: Record<string, string>;
+  rank?: number;
+  life?: {
+    text: string;
+    id?: string;
+    copyright?: string;
+  };
+  services?: Record<string, ServiceData>;
+  troparion?: { tone: number; text: string }[];
+  kontakion?: { tone: number; text: string }[];
+  scriptures?: { type: string; reading: string }[];
+  icon?: string;
+}
+
+/** Service data within a saint's life file. */
+export interface ServiceData {
+  [path: string]: Record<string, { text: string; [key: string]: string }>;
+}
+
+/** Fasting rule for a day. */
+export interface FastingInfo {
+  level: FastingLevel;
+  description: string;
+  meatFree: boolean;
+  fishPermitted: boolean;
+  caviarPermitted: boolean;
+  oilPermitted: boolean;
+  winePermitted: boolean;
+  strictFast: boolean;
+  noFood: boolean;
+}
+
+export enum FastingLevel {
+  NoFast = 0,
+  WineAndOil = 1,
+  Xerophagy = 2,
+  StrictWithOil = 3,
+  Strict = 4,
+  CompleteFast = 5,
+}
+
+/** Service template node — dynamic JSON from converted XML. */
+export interface ServiceNode {
+  type: string;
+  [key: string]: unknown;
+}
+
+/** Service rules for a given liturgical period. */
+export interface ServiceRule {
+  cmd: string;
+  services: Record<string, ServiceTypeConfig>;
+}
+
+export interface ServiceTypeConfig {
+  type: string;
+  troparion?: string;
+  pickT?: number;
+  kontakion?: string;
+  pickK?: number;
+  lentenk?: number;
+}
+
+/** Bible translation metadata. */
+export interface BibleVersion {
+  id: string;
+  name: string;
+  language: string;
+  books: BibleBook[];
+  info: BibleInfo;
+}
+
+export interface BibleBook {
+  id: string;
+  name: string;
+  chapters: number;
+  short: string;
+  intro?: string;
+}
+
+export interface BibleInfo {
+  verseNumFormat: string;
+  verseNoNumFormat: string;
+  verseLink: string;
+  abbrevFormat: string;
+  chapterN: string;
+  headerFormat: string;
+  chapterNI: string;
+  verseNo: string[];
+  chapterNo: string[];
+  cvSep: string;
+  duration: string;
+  selectionSeparator: string;
+  bcSep: string;
+  fontFace: string;
+  fontSize: number;
+  parts: string;
+  orient: string;
+}
+
+/** Language info. */
+export type LanguageCode = 'en' | 'ru' | 'cu';
+
+export interface LanguageInfo {
+  code: LanguageCode;
+  name: string;
+  nameLocal: string;
+  dir: 'ltr' | 'rtl';
+  fontFace: string;
+  liturgicalFont: string;
+  liturgicalSize: number;
+}
+
+/** Fasting rule from Fasting.xml. */
+export interface FastingRule {
+  case: string;   // 7-bit binary string
+  cmd: string;    // boolean expression
+}
+
+/** Fasting period from Fasting.xml. */
+export interface FastingPeriod {
+  cmd: string;
+  rules: FastingRule[];
+}
diff --git a/src/main.ts b/src/main.ts
new file mode 100644
index 0000000..0820842
--- /dev/null
+++ b/src/main.ts
@@ -0,0 +1,5 @@
+import './styles/main.css';
+import { App } from './ui/app';
+
+const app = new App(document.getElementById('app')!);
+app.init();
diff --git a/src/styles/main.css b/src/styles/main.css
new file mode 100644
index 0000000..cc2b826
--- /dev/null
+++ b/src/styles/main.css
@@ -0,0 +1,149 @@
+@import "tailwindcss";
+
+@theme {
+  --color-parchment: #f5f0e8;
+  --color-parchment-dark: #e8dfd0;
+  --color-navy: #1a1a2e;
+  --color-navy-light: #2a2a4e;
+  --color-gold: #c5a55a;
+  --color-gold-light: #d4b96e;
+  --color-red: #8b0000;
+  --color-red-light: #a52a2a;
+  --color-purple: #4a0e4e;
+  --color-green: #2d5a27;
+  --color-blue: #1a3a6e;
+}
+
+@font-face {
+  font-family: 'Ponomar';
+  src: url('/fonts/Ponomar-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Fedorovsk';
+  src: url('/fonts/Fedorovsk-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Indiction';
+  src: url('/fonts/Indiction-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Menaion';
+  src: url('/fonts/Menaion-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Monomakh';
+  src: url('/fonts/Monomakh-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Triodion';
+  src: url('/fonts/Triodion-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Vilnius';
+  src: url('/fonts/Vilnius-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+@font-face {
+  font-family: 'Voskresensky';
+  src: url('/fonts/Voskresensky-Regular.woff') format('woff');
+  font-weight: normal;
+  font-style: normal;
+  font-display: swap;
+}
+
+html, body {
+  margin: 0;
+  padding: 0;
+  background-color: var(--color-parchment);
+  color: var(--color-navy);
+  font-family: 'Noto Sans', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  -webkit-font-smoothing: antialiased;
+  overscroll-behavior: none;
+}
+
+.font-slavonic {
+  font-family: 'Ponomar', 'Noto Serif', Georgia, serif;
+}
+.font-ponomar { font-family: 'Ponomar', 'Noto Serif', Georgia, serif; }
+.font-fedrovsk { font-family: 'Fedorovsk', 'Noto Serif', Georgia, serif; }
+.font-indiction { font-family: 'Indiction', 'Noto Serif', Georgia, serif; }
+.font-menaion { font-family: 'Menaion', 'Noto Serif', Georgia, serif; }
+.font-monomakh { font-family: 'Monomakh', 'Noto Serif', Georgia, serif; }
+.font-triodion { font-family: 'Triodion', 'Noto Serif', Georgia, serif; }
+.font-vilnius { font-family: 'Vilnius', 'Noto Serif', Georgia, serif; }
+.font-voskresensky { font-family: 'Voskresensky', 'Noto Serif', Georgia, serif; }
+
+.font-system-slavonic {
+  font-family: 'Noto Serif', Georgia, serif;
+}
+
+.rank-icon {
+  font-family: 'Ponomar', serif;
+  font-size: 130%;
+}
+
+.liturgical-text {
+  font-size: var(--liturgical-font-size, 18px);
+  line-height: 1.6;
+}
+.liturgical-text > :first-child {
+  margin-top: 0;
+}
+
+.speaker-label {
+  color: var(--color-red);
+  font-weight: 700;
+}
+
+.rubric {
+  color: var(--color-red);
+  font-style: italic;
+}
+
+.drop-cap::first-letter {
+  color: var(--color-red);
+  font-weight: 700;
+  font-size: 1.5em;
+  float: left;
+  line-height: 1;
+  margin-right: 0.1em;
+}
+
+/* Scrollbar styling */
+::-webkit-scrollbar {
+  width: 6px;
+}
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+::-webkit-scrollbar-thumb {
+  background: var(--color-gold);
+  border-radius: 3px;
+}
+
+/* PWA safe area insets */
+@supports (padding: env(safe-area-inset-bottom)) {
+  .nav-bar {
+    padding-bottom: calc(0.5rem + env(safe-area-inset-bottom));
+  }
+}
diff --git a/src/ui/app.ts b/src/ui/app.ts
new file mode 100644
index 0000000..dff0742
--- /dev/null
+++ b/src/ui/app.ts
@@ -0,0 +1,142 @@
+/**
+ * Main application shell — SPA router and layout.
+ */
+
+import { CalendarView } from './calendar-view';
+import { BibleView } from './bible-view';
+import { SettingsView } from './settings-view';
+import { JDate } from '../core/jdate';
+import { loadSettings, type Settings } from './settings-view';
+import { getTranslations, type LanguageCode } from '../core/i18n';
+
+type View = 'calendar' | 'bible' | 'settings';
+
+export class App {
+  private container: HTMLElement;
+  private currentView: View = 'calendar';
+  private currentDate: JDate;
+  private settings: Settings;
+
+  constructor(container: HTMLElement) {
+    this.container = container;
+    this.currentDate = JDate.today();
+    this.settings = loadSettings();
+    document.documentElement.style.setProperty('--liturgical-font-size', this.settings.fontSize + 'px');
+  }
+
+  init() {
+    this.container.innerHTML = '';
+    this.render();
+    this.handleRoute();
+    window.addEventListener('hashchange', () => this.handleRoute());
+
+    // Register service worker for PWA install
+    if ('serviceWorker' in navigator) {
+      navigator.serviceWorker.register('/sw.js').catch(() => {});
+    }
+    window.addEventListener('beforeinstallprompt', (e) => {
+      e.preventDefault();
+      (window as any).__deferredPrompt = e;
+    });
+  }
+
+  private handleRoute() {
+    const hash = window.location.hash.slice(1) || 'calendar';
+    const parts = hash.split('/');
+    this.currentView = parts[0] as View || 'calendar';
+    this.renderView();
+  }
+
+  private resolveBibleVersion(shortId: string, lang: string): string {
+    // Map short version IDs like "kjv" to full paths like "en/bible/kjv"
+    const langMap: Record<string, string> = {
+      en: 'en/bible/kjv',
+      ru: 'ru/bible/synod',
+      cu: 'cu/bible/elis',
+    };
+    if (shortId === 'kjv' || shortId === 'brenton' || shortId === 'nonkjv') return `en/bible/${shortId}`;
+    if (shortId === 'synod' || shortId === 'kassian' || shortId === 'yungerov') return `ru/bible/${shortId}`;
+    if (shortId === 'elis') return 'cu/bible/elis';
+    if (shortId === 'ls') return 'fr/bible/ls';
+    if (shortId === 'spt') return 'el/bible/spt';
+    if (shortId === 'vulgate') return 'la/bible/vulgate';
+    if (shortId === 'cuv') return 'zh/Hans/bible/cuv';
+    if (shortId === 'cuv-hant') return 'zh/Hant/bible/cuv';
+    if (shortId === 'svd') return 'ar/bible/svd';
+    return langMap[lang] || 'en/bible/kjv';
+  }
+
+  private render() {
+    const t = getTranslations(this.settings.language as LanguageCode);
+    this.container.innerHTML = `
+      <div class="app-container min-h-screen flex flex-col">
+        <header class="bg-navy text-parchment p-3 flex items-center justify-between shadow-md">
+          <h1 class="text-sm font-bold tracking-wide">${t.appName}</h1>
+          <nav class="flex gap-4 text-sm">
+            <a href="#calendar" class="nav-link hover:text-gold transition-colors" data-view="calendar">${t.nav.calendar}</a>
+            <a href="#bible" class="nav-link hover:text-gold transition-colors" data-view="bible">${t.nav.bible}</a>
+            <a href="#settings" class="nav-link hover:text-gold transition-colors" data-view="settings">${t.nav.settings}</a>
+          </nav>
+        </header>
+        <main id="view-container" class="flex-1 overflow-auto"></main>
+      </div>
+    `;
+  }
+
+  private renderView() {
+    const viewContainer = document.getElementById('view-container')!;
+    viewContainer.innerHTML = '';
+
+    // Update active nav
+    document.querySelectorAll('.nav-link').forEach(el => {
+      const v = el.getAttribute('data-view');
+      el.classList.toggle('text-gold', v === this.currentView);
+      el.classList.toggle('font-bold', v === this.currentView);
+    });
+
+    // Re-read settings fresh on each navigation
+    this.settings = loadSettings();
+    const lang = this.settings.language as LanguageCode;
+    const calendarType = this.settings.calendarType || 'julian';
+
+    switch (this.currentView) {
+      case 'calendar':
+        new CalendarView(viewContainer, this.currentDate, (date) => {
+          this.currentDate = date;
+        }, lang, calendarType).render();
+        break;
+      case 'bible': {
+        // Parse route params: #bible/{lang~short}/{book}/{passage}
+        const hash = window.location.hash.slice(1);
+        const bp = hash.split('/');
+        const versionSpec = bp[1] || '';
+        const bibleBook = bp[2] || '';
+        const biblePassage = bp[3] || '';
+        let bibleVersion: string;
+        if (!versionSpec) {
+          bibleVersion = this.resolveBibleVersion(this.settings.defaultBibleVersion, lang);
+        } else if (versionSpec.includes('~')) {
+          // Format: lang~short e.g. "en~kjv" → "en/bible/kjv"
+          const [vl, vs] = versionSpec.split('~');
+          bibleVersion = `${vl}/bible/${vs}`;
+        } else if (versionSpec.includes('/')) {
+          bibleVersion = versionSpec; // legacy full path
+        } else {
+          bibleVersion = this.resolveBibleVersion(versionSpec, lang);
+        }
+        new BibleView(viewContainer, lang, bibleVersion, bibleBook, biblePassage).render();
+        break;
+      }
+      case 'settings':
+        new SettingsView(viewContainer, () => {
+          this.render();
+          this.renderView();
+        }).render();
+        break;
+    }
+  }
+
+  go(view: View) {
+    window.location.hash = view;
+  }
+}
diff --git a/src/ui/bible-view.ts b/src/ui/bible-view.ts
new file mode 100644
index 0000000..e027467
--- /dev/null
+++ b/src/ui/bible-view.ts
@@ -0,0 +1,285 @@
+/**
+ * Bible view — reader with all translation variants.
+ */
+
+import {
+  parsePassage,
+  parseTextFile,
+  extractPassage,
+  formatPassageHTML,
+} from '../core/bible-reader';
+import { getTranslations, type LanguageCode } from '../core/i18n';
+
+const SETTINGS_KEY = 'ponomar-settings';
+const BIBLE_STATE_KEY = 'ponomar-bible-state';
+
+function loadBibleState(version: string): { book: string; passage: string } | null {
+  try {
+    const stored = localStorage.getItem(BIBLE_STATE_KEY);
+    if (stored) {
+      const parsed = JSON.parse(stored);
+      const pos = parsed.positions?.[version];
+      if (pos?.book && pos?.passage) return pos;
+    }
+  } catch { /* ignore */ }
+  return null;
+}
+
+function saveBibleState(version: string, book: string, passage: string) {
+  try {
+    const stored = localStorage.getItem(BIBLE_STATE_KEY);
+    const state: { positions: Record<string, { book: string; passage: string }> } = stored ? JSON.parse(stored) : { positions: {} };
+    state.positions[version] = { book, passage };
+    localStorage.setItem(BIBLE_STATE_KEY, JSON.stringify(state));
+  } catch { /* ignore */ }
+}
+
+function loadSettings(): { cuFont: string; showVerseNumbers: boolean; verseNewLine: boolean } {
+  try {
+    const stored = localStorage.getItem(SETTINGS_KEY);
+    const defaults = { cuFont: 'Ponomar', showVerseNumbers: true, verseNewLine: false };
+    if (stored) {
+      const parsed = JSON.parse(stored);
+      if (parsed.usePonomarFont !== undefined) {
+        parsed.cuFont = parsed.usePonomarFont ? 'Ponomar' : '';
+        delete parsed.usePonomarFont;
+      }
+      return { ...defaults, ...parsed };
+    }
+  } catch { /* ignore */ }
+  return { cuFont: 'Ponomar', showVerseNumbers: true, verseNewLine: false };
+}
+
+const FONT_CSS_MAP: Record<string, string> = {
+  Ponomar: 'font-ponomar',
+  Fedorovsk: 'font-fedrovsk',
+  Indiction: 'font-indiction',
+  Menaion: 'font-menaion',
+  Monomakh: 'font-monomakh',
+  Triodion: 'font-triodion',
+  Vilnius: 'font-vilnius',
+  Voskresensky: 'font-voskresensky',
+};
+
+function fontClass(fontName: string): string {
+  return FONT_CSS_MAP[fontName] || (fontName ? '' : 'font-system-slavonic');
+}
+
+interface BibleVersion {
+  id: string;
+  name: string;
+  language: string;
+  books: { id: string; name: string; short: string; chapters: number }[];
+}
+
+export class BibleView {
+  private container: HTMLElement;
+  private currentVersion: string;
+  private currentBook: string;
+  private currentPassage: string;
+  private versions: BibleVersion[] = [];
+  private loadedText: Map<string, string> = new Map();
+  private t: ReturnType<typeof getTranslations>;
+
+  constructor(container: HTMLElement, language: LanguageCode = 'en', version = '', book = '', passage = '') {
+    this.container = container;
+    this.t = getTranslations(language);
+    this.currentVersion = version || 'en/bible/kjv';
+
+    if (!book && !passage) {
+      const saved = loadBibleState(this.currentVersion);
+      if (saved) { book = saved.book; passage = saved.passage; }
+    }
+
+    this.currentBook = book || 'Gen';
+    this.currentPassage = passage || '1';
+    this.loadVersions();
+  }
+
+  private async loadVersions() {
+    try {
+      const resp = await fetch('/data/bible/versions.json');
+      this.versions = await resp.json();
+    } catch {
+      this.versions = [
+        { id: 'en/bible/kjv', name: 'English (KJV)', language: 'en', books: [] },
+        { id: 'ru/bible/synod', name: 'Русский (Синодальный)', language: 'ru', books: [] },
+        { id: 'cu/bible/elis', name: 'Церковнославянская', language: 'cu', books: [] },
+      ];
+    }
+  }
+
+  async render() {
+    await this.loadVersions();
+
+    this.container.innerHTML = `
+      <div class="flex flex-col h-full">
+        <div class="bg-navy text-parchment p-3 flex items-center gap-4 flex-wrap">
+          <select id="version-select" class="bg-navy-light text-parchment border border-gold/30 rounded px-2 py-1 text-sm">
+            ${this.versions.map(v =>
+              `<option value="${v.id}" ${v.id === this.currentVersion ? 'selected' : ''}>${v.name}</option>`
+            ).join('')}
+          </select>
+          <select id="book-select" class="bg-navy-light text-parchment border border-gold/30 rounded px-2 py-1 text-sm">
+            ${this.getBooksForVersion().map(b =>
+              `<option value="${b.id}" ${b.id === this.currentBook ? 'selected' : ''}>${b.name}</option>`
+            ).join('')}
+          </select>
+          <div class="flex items-center gap-1">
+            <button id="prev-chapter" class="bg-navy-light text-parchment border border-gold/30 rounded px-2 py-1 text-sm hover:bg-gold/20 disabled:opacity-40">◀</button>
+            <select id="chapter-select" class="bg-navy-light text-parchment border border-gold/30 rounded px-2 py-1 text-sm">
+            </select>
+            <button id="next-chapter" class="bg-navy-light text-parchment border border-gold/30 rounded px-2 py-1 text-sm hover:bg-gold/20 disabled:opacity-40">▶</button>
+          </div>
+        </div>
+
+        <div id="bible-text" class="flex-1 overflow-auto p-2 max-w-3xl mx-auto liturgical-text">
+          <p class="text-navy-light italic">${this.t.bible.selectBook}</p>
+        </div>
+      </div>
+    `;
+
+    this.updateChapterSelect();
+    this.loadReading();
+
+    document.getElementById('version-select')?.addEventListener('change', (e) => {
+      this.currentVersion = (e.target as HTMLSelectElement).value;
+      const books = this.getBooksForVersion();
+      const sameBook = books.find(b => b.id === this.currentBook);
+      if (sameBook) {
+        const ch = parseInt(this.currentPassage, 10);
+        if (ch > sameBook.chapters) this.currentPassage = '1';
+      } else {
+        this.currentBook = books[0]?.id || 'Gen';
+        this.currentPassage = '1';
+      }
+      this.updateBookSelect();
+      this.loadReading();
+    });
+
+    document.getElementById('book-select')?.addEventListener('change', (e) => {
+      this.currentBook = (e.target as HTMLSelectElement).value;
+      this.currentPassage = '1';
+      this.updateChapterSelect();
+      this.loadReading();
+    });
+
+    document.getElementById('chapter-select')?.addEventListener('change', (e) => {
+      this.currentPassage = (e.target as HTMLSelectElement).value;
+      this.loadReading();
+    });
+
+    document.getElementById('prev-chapter')?.addEventListener('click', () => {
+      const ch = parseInt(this.currentPassage, 10);
+      if (ch > 1) {
+        this.currentPassage = String(ch - 1);
+        this.updateChapterSelect();
+        this.loadReading();
+      } else {
+        const books = this.getBooksForVersion();
+        const idx = books.findIndex(b => b.id === this.currentBook);
+        if (idx > 0) {
+          const prevBook = books[idx - 1];
+          this.currentBook = prevBook.id;
+          this.currentPassage = String(prevBook.chapters);
+          this.updateBookSelect();
+          this.loadReading();
+        }
+      }
+    });
+
+    document.getElementById('next-chapter')?.addEventListener('click', () => {
+      const ch = parseInt(this.currentPassage, 10);
+      const books = this.getBooksForVersion();
+      const book = books.find(b => b.id === this.currentBook);
+      const maxCh = book?.chapters ?? 50;
+      if (ch < maxCh) {
+        this.currentPassage = String(ch + 1);
+        this.updateChapterSelect();
+        this.loadReading();
+      } else {
+        const idx = books.findIndex(b => b.id === this.currentBook);
+        if (idx < books.length - 1) {
+          const nextBook = books[idx + 1];
+          this.currentBook = nextBook.id;
+          this.currentPassage = '1';
+          this.updateBookSelect();
+          this.loadReading();
+        }
+      }
+    });
+  }
+
+  private getBooksForVersion(): { id: string; name: string; chapters: number }[] {
+    const version = this.versions.find(v => v.id === this.currentVersion);
+    return version?.books ?? [];
+  }
+
+  private updateBookSelect() {
+    const select = document.getElementById('book-select') as HTMLSelectElement;
+    if (!select) return;
+    const books = this.getBooksForVersion();
+    select.innerHTML = books.map(b =>
+      `<option value="${b.id}" ${b.id === this.currentBook ? 'selected' : ''}>${b.name}</option>`
+    ).join('');
+    this.updateChapterSelect();
+  }
+
+  private updateChapterSelect() {
+    const select = document.getElementById('chapter-select') as HTMLSelectElement;
+    if (!select) return;
+    const books = this.getBooksForVersion();
+    const book = books.find(b => b.id === this.currentBook);
+    const chapters = book?.chapters ?? 50;
+    select.innerHTML = Array.from({ length: chapters }, (_, i) =>
+      `<option value="${i + 1}" ${i + 1 === parseInt(this.currentPassage, 10) ? 'selected' : ''}>${i + 1}</option>`
+    ).join('');
+    // Sync passage to selected chapter
+    this.currentPassage = select.value;
+  }
+
+  private async loadReading() {
+    const textEl = document.getElementById('bible-text');
+    if (!textEl) return;
+
+    textEl.innerHTML = `<p class="text-navy-light italic">${this.t.loading}</p>`;
+
+    try {
+      const cacheKey = `${this.currentVersion}/${this.currentBook}`;
+      let text = this.loadedText.get(cacheKey);
+
+      if (!text) {
+        // Version IDs are full paths like "en/bible/kjv"
+        const resp = await fetch(`/data/${this.currentVersion}/${this.currentBook}.text`);
+        if (!resp.ok) throw new Error('Not found');
+        text = await resp.text();
+        this.loadedText.set(cacheKey, text);
+      }
+
+      const chapters = parseTextFile(text!);
+      const reading = parsePassage(this.currentPassage);
+      const passages = extractPassage(chapters, reading);
+      const settings = loadSettings();
+      const html = formatPassageHTML(passages, { showVerseNumbers: settings.showVerseNumbers, verseNewLine: settings.verseNewLine });
+
+      // Apply Ponomar font for Church Slavonic texts
+      const version = this.versions.find(v => v.id === this.currentVersion);
+      const isChurchSlavonic = version?.language === 'cu';
+      const fnClass = isChurchSlavonic ? fontClass(settings.cuFont) : '';
+
+      textEl.className = `flex-1 overflow-auto p-2 max-w-3xl mx-auto liturgical-text ${fnClass}`;
+      textEl.innerHTML = html || `<p class="text-navy-light">${this.t.bible.noTextFound}</p>`;
+    } catch {
+      textEl.innerHTML = `
+        <div class="text-center py-12">
+          <p class="text-navy-light mb-4">${this.t.bible.notAvailableOffline}</p>
+          <p class="text-sm text-navy-light">
+            ${this.t.bible.ensureDataConverted}
+          </p>
+        </div>
+      `;
+    }
+
+    saveBibleState(this.currentVersion, this.currentBook, this.currentPassage);
+  }
+}
\ No newline at end of file
diff --git a/src/ui/calendar-view.ts b/src/ui/calendar-view.ts
new file mode 100644
index 0000000..cdde05e
--- /dev/null
+++ b/src/ui/calendar-view.ts
@@ -0,0 +1,918 @@
+/**
+ * Calendar view — month grid + day detail panel with actual data loading.
+ */
+
+import { JDate } from '../core/jdate';
+import { Paschalion } from '../core/paschalion';
+import { computeDay } from '../core/day-computer';
+import { evaluateFasting } from '../core/fasting';
+import type { FastingPeriod } from '../core/fasting';
+import { getTranslations, type LanguageCode } from '../core/i18n';
+import { fontClass } from './settings-view';
+import { ServiceView } from './service-view';
+
+let cachedFastingPeriods: FastingPeriod[] | null = null;
+const lifeCache = new Map<string, LifeData | null>();
+const menaionBundles = new Map<string, Record<string, unknown>>();
+let sharedScriptureIndex: Record<string, unknown[]> | null = null;
+let bookAbbrevMap: Record<string, string> | null = null;
+let bookCVSep = ':';
+let bookAbbrevLang = '';
+
+function resolveDefaultBibleVersion(): string {
+  try {
+    const stored = localStorage.getItem('ponomar-settings');
+    if (stored) {
+      const s = JSON.parse(stored);
+      return s.defaultBibleVersion || 'kjv';
+    }
+  } catch {}
+  return 'kjv';
+}
+
+function shortToLang(shortId: string): string {
+  if (shortId === 'kjv' || shortId === 'brenton' || shortId === 'nonkjv') return 'en';
+  if (shortId === 'synod' || shortId === 'kassian' || shortId === 'yungerov') return 'ru';
+  if (shortId === 'elis') return 'cu';
+  if (shortId === 'ls') return 'fr';
+  if (shortId === 'spt') return 'el';
+  if (shortId === 'vulgate') return 'la';
+  if (shortId === 'cuv' || shortId === 'cuv-hant') return 'zh';
+  if (shortId === 'svd') return 'ar';
+  return 'en';
+}
+
+async function loadBookAbbrevs(lang: string): Promise<void> {
+  if (bookAbbrevLang === lang && bookAbbrevMap) return;
+  bookAbbrevLang = lang;
+  bookAbbrevMap = null;
+  try {
+    const resp = await fetch('/data/bible/versions.json');
+    if (!resp.ok) return;
+    const ct = resp.headers.get('content-type');
+    if (ct && ct.includes('text/html')) return;
+    const versions = await resp.json() as any[];
+    const ver = versions.find((v: any) => v.id.startsWith(lang + '/')) || versions[0];
+    if (ver) {
+      const map: Record<string, string> = {};
+      if (ver.books) {
+        for (const book of ver.books) {
+          map[book.id] = book.short || book.id;
+        }
+      }
+      bookAbbrevMap = map;
+      if (ver.formatting?.CVSep) {
+        bookCVSep = ver.formatting.CVSep;
+      }
+    }
+  } catch {}
+}
+
+function formatReadingRef(reading: string, _lang: string): string {
+  const idx = reading.indexOf('_');
+  if (idx === -1) return reading.replace(/_/g, ' ');
+  const bookId = reading.substring(0, idx);
+  const passage = reading.substring(idx + 1);
+  const lookupId = bookId.replace(/ /g, '_');
+  const abbrev = bookAbbrevMap?.[lookupId] || bookId;
+  const formatted = passage.replace(/:/g, bookCVSep === ',' ? ',' : bookCVSep === '：' ? '：' : ':');
+  const display = `${abbrev} ${formatted}`;
+  const chMatch = passage.match(/^(\d+)/);
+  const chapter = chMatch ? chMatch[1] : '1';
+  const defaultShort = resolveDefaultBibleVersion();
+  const langPrefix = shortToLang(defaultShort);
+  return `<a href="#bible/${langPrefix}~${defaultShort}/${bookId.replace(/ /g, '_')}/${chapter}" class="text-blue-600 underline hover:text-blue-800">${display}</a>`;
+}
+
+async function loadSharedScriptureIndex(): Promise<Record<string, unknown[]> | null> {
+  if (sharedScriptureIndex) return sharedScriptureIndex;
+  try {
+    const resp = await fetch('/data/shared/lives-index.json');
+    if (!resp.ok) return null;
+    const ct = resp.headers.get('content-type');
+    if (ct && ct.includes('text/html')) return null;
+    sharedScriptureIndex = await resp.json();
+    return sharedScriptureIndex;
+  } catch {
+    return null;
+  }
+}
+
+async function loadMenaionBundle(lang: string): Promise<Record<string, unknown> | null> {
+  const key = lang === 'cu' ? 'cu' : lang;
+  if (menaionBundles.has(key)) return menaionBundles.get(key)!;
+  try {
+    const resp = await fetch(`/data/${key}/menaion-bundle.json`);
+    if (!resp.ok) return null;
+    const ct = resp.headers.get('content-type');
+    if (ct && ct.includes('text/html')) return null;
+    const bundle = await resp.json() as Record<string, unknown>;
+    menaionBundles.set(key, bundle);
+    return bundle;
+  } catch {
+    return null;
+  }
+}
+
+async function loadFastingPeriods(): Promise<FastingPeriod[]> {
+  if (cachedFastingPeriods) return cachedFastingPeriods;
+  try {
+    const resp = await fetch('/data/shared/fasting.json');
+    if (!resp.ok) return [];
+    cachedFastingPeriods = await resp.json();
+    return cachedFastingPeriods!;
+  } catch {
+    return [];
+  }
+}
+
+interface LifeData {
+  name?: {
+    nominative?: string;
+    short?: string;
+    '@_Nominative'?: string;
+    '@_Short'?: string;
+  };
+  life?: {
+    text: string;
+  };
+  scripture?: {
+    type?: string;
+    Type?: string;
+    reading?: string;
+    Reading?: string;
+    pericope?: string;
+    Pericope?: string;
+    cmd?: string;
+  }[];
+  services?: Record<string, unknown>;
+  [key: string]: unknown;
+}
+
+interface CommemorationData {
+  NAME?: { Long?: string; ShortN?: string; ShortF?: string } | { text: string };
+  LIFE?: { text: string };
+  CHURCH?: { Rank?: string };
+  SCRIPTURE?: { Type?: string; Reading?: string; Pericope?: string; Cmd?: string } | { Type?: string; Reading?: string; Pericope?: string; Cmd?: string }[];
+  SERVICE?: Record<string, unknown>;
+  TROPARION?: { Tone?: string; text?: string } | { Tone?: string; text?: string }[];
+  [key: string]: unknown;
+}
+
+interface ReadingItem {
+  ref: string;
+  purpose: string;
+}
+
+interface ReadingsGroup {
+  service: string;
+  items: ReadingItem[];
+}
+
+/** Order of services for display (Vespers → Hours → Matins → Liturgy sub-types) */
+const SERVICE_ORDER = ['Вечерня', '1-й час', '3-й час', '6-й час', '9-й час', 'Утреня', 'Апостол', 'Евангелие'];
+
+/** Map Type/service name to display service label */
+function readingsTypeToService(type: string, t: ReturnType<typeof getTranslations>): string {
+  switch (type) {
+    case 'apostol': return t.calendar.readingTypes.apostol;
+    case 'gospel': return t.calendar.readingTypes.gospel;
+    case 'matins': return t.calendar.readingTypes.matins;
+    case 'vespers': return t.calendar.readingTypes.vespers;
+    case 'primes': return t.calendar.readingTypes.primes;
+    case 'terce': return t.calendar.readingTypes.terce;
+    case 'sext': return t.calendar.readingTypes.sext;
+    case 'none': return t.calendar.readingTypes.none;
+    case 'liturgy': return t.calendar.readingTypes.liturgy;
+    case 'A': return t.calendar.readings;
+    default:
+      if (/^[0-9]+$/.test(type)) {
+        const n = parseInt(type, 10);
+        if (n <= 3 || n === 0) return t.calendar.readingTypes.vespers;
+        return t.calendar.readingTypes.matins;
+      }
+      return t.calendar.readingTypes[type] || t.calendar.readings;
+  }
+}
+
+function svcNameToService(svcName: string, scType: string, t: ReturnType<typeof getTranslations>): string {
+  const upper = svcName.toUpperCase();
+  if (upper === 'LITURGY') {
+    return readingsTypeToService(scType, t);
+  }
+  return readingsTypeToService(upper.toLowerCase(), t);
+}
+
+function findOrCreateGroup(groups: ReadingsGroup[], service: string): ReadingsGroup {
+  let group = groups.find(g => g.service === service);
+  if (!group) {
+    group = { service, items: [] };
+    groups.push(group);
+  }
+  return group;
+}
+
+/** Map of menaion CId to shared commemoration ID (for feast days with special commemorations) */
+const CID_TO_SHARED_COMM: Record<string, string> = {
+  '010101': '134',   // Circumcision
+  '010601': '35',    // Theophany
+  '011901': '373',   // Theophany (Julian)
+  '020201': '373',   // Meeting of the Lord
+  '032501': '543',   // Annunciation
+  '080601': '543',   // Transfiguration
+  '081501': '373',   // Dormition
+  '091401': 'F0',    // Elevation of Cross
+  '092101': 'F6',    // Nativity of Theotokos
+  '010701': '373',   // Synaxis of John the Baptist
+  '070701': '373',   // Nativity of John the Baptist
+  '082901': '373',   // Beheading of John the Baptist
+};
+
+async function loadLife(lang: LanguageCode, cid: string): Promise<LifeData | null> {
+  const cacheKey = `${lang}/${cid}`;
+  if (lifeCache.has(cacheKey)) return lifeCache.get(cacheKey)!;
+  try {
+    const bundleName = /^(0[1-9]|1[0-2])\d+/.test(cid) ? cid.substring(0, 2) : 'misc';
+    async function tryFetch(prefix: string): Promise<Response | null> {
+      const resp = await fetch(`/data/${prefix}/lives/${bundleName}.json`);
+      if (!resp.ok) return null;
+      const ct = resp.headers.get('content-type');
+      if (ct && ct.includes('text/html')) return null;
+      return resp;
+    }
+    let resp = await tryFetch(lang);
+    if (!resp && lang !== 'cu') {
+      resp = await tryFetch('cu');
+    }
+    if (!resp) {
+      lifeCache.set(cacheKey, null);
+      return null;
+    }
+    const bundle = await resp.json() as Record<string, unknown>;
+    const life = (bundle[cid] || null) as LifeData | null;
+    if (!life) {
+      lifeCache.set(cacheKey, null);
+      return null;
+    }
+
+    // Merge rank from cu life if language-specific life lacks it
+    if (!life.rank && lang !== 'cu') {
+      try {
+        const cuResp = await fetch(`/data/cu/lives/${bundleName}.json`);
+        if (cuResp.ok) {
+          const ct = cuResp.headers.get('content-type');
+          if (!ct || !ct.includes('text/html')) {
+            const cuBundle = await cuResp.json() as Record<string, unknown>;
+            const cuLife = cuBundle[cid] as LifeData | undefined;
+            if (cuLife?.rank) life.rank = cuLife.rank;
+          }
+        }
+      } catch {}
+    }
+
+    // Merge scripture from shared lives index (one HTTP request for all)
+    const index = await loadSharedScriptureIndex();
+    if (index && index[cid]) {
+      const raw = index[cid];
+      const sharedArr = (Array.isArray(raw) ? raw : [raw]) as LifeData['scripture'];
+      if (sharedArr && sharedArr.length > 0) {
+        if (life.scripture) {
+          const existing = Array.isArray(life.scripture) ? life.scripture : [life.scripture];
+          life.scripture = [...existing, ...sharedArr] as LifeData['scripture'];
+        } else {
+          life.scripture = sharedArr;
+        }
+      }
+    }
+
+    lifeCache.set(cacheKey, life);
+    return life;
+  } catch {
+    lifeCache.set(cacheKey, null);
+    return null;
+  }
+}
+
+async function loadCommemoration(sharedId: string): Promise<CommemorationData | null> {
+  try {
+    const resp = await fetch(`/data/shared/commemorations/${sharedId}.json`);
+    if (!resp.ok) return null;
+    const ct = resp.headers.get('content-type');
+    if (ct && ct.includes('text/html')) return null;
+    return await resp.json();
+  } catch {
+    return null;
+  }
+}
+
+function getPeriodName(life: LifeData | undefined): string {
+  if (!life?.name) return '';
+  return life.name['@_Nominative'] || life.name.nominative || life.name['@_Short'] || life.name.short || '';
+}
+
+function getShortFeastName(life: LifeData | undefined, shared: CommemorationData | null | undefined): string {
+  if (life?.name?.['@_Short']) return life.name['@_Short'];
+  if (life?.name?.short) return life.name.short;
+  return getCommsName(shared);
+}
+
+function getCommsName(shared: CommemorationData | null | undefined): string {
+  if (!shared?.NAME) return '';
+  if (typeof shared.NAME === 'object' && 'Long' in shared.NAME) {
+    return shared.NAME.Long || shared.NAME.ShortN || '';
+  }
+  if (typeof shared.NAME === 'object' && 'text' in shared.NAME) {
+    return (shared.NAME as { text: string }).text || '';
+  }
+  return '';
+}
+
+async function loadMenaion(lang: LanguageCode, month: number, day: number): Promise<unknown[]> {
+  const mm = String(month).padStart(2, '0');
+  const dd = String(day).padStart(2, '0');
+  const dateKey = `${mm}-${dd}`;
+  try {
+    // Try lang-specific bundle first
+    let bundle = await loadMenaionBundle(lang);
+    if (!bundle && lang !== 'cu') {
+      bundle = await loadMenaionBundle('cu');
+    }
+    if (bundle && bundle[dateKey]) {
+      const arr = bundle[dateKey];
+      return Array.isArray(arr) ? arr : [];
+    }
+    return [];
+  } catch {
+    return [];
+  }
+}
+
+async function loadTriodionFile(index: number): Promise<unknown[]> {
+  try {
+    const resp = await fetch(`/data/shared/triodion/${String(index).padStart(2, '0')}.json`);
+    if (!resp.ok) return [];
+    return await resp.json();
+  } catch {
+    return [];
+  }
+}
+
+async function loadPentecostarionFile(index: number): Promise<unknown[]> {
+  try {
+    const resp = await fetch(`/data/shared/pentecostarion/${String(index).padStart(2, '0')}.json`);
+    if (!resp.ok) return [];
+    return await resp.json();
+  } catch {
+    return [];
+  }
+}
+
+export class CalendarView {
+  private container: HTMLElement;
+  private currentDate: JDate;
+  private onDateChange: (date: JDate) => void;
+  private skipCids: Set<string> = new Set();
+  private language: LanguageCode;
+  private t: ReturnType<typeof getTranslations>;
+  private calendarType: 'julian' | 'gregorian';
+
+  constructor(container: HTMLElement, date: JDate, onDateChange: (d: JDate) => void, language: LanguageCode = 'en', calendarType: 'julian' | 'gregorian' = 'julian') {
+    this.container = container;
+    this.currentDate = date;
+    this.onDateChange = onDateChange;
+    this.language = language;
+    this.t = getTranslations(language);
+    this.calendarType = calendarType;
+  }
+
+  private getFontClass(): string {
+    try {
+      const stored = localStorage.getItem('ponomar-settings');
+      if (stored) {
+        const settings = JSON.parse(stored);
+        let cuFont = settings.cuFont || '';
+        // Migrate old usePonomarFont
+        if (settings.usePonomarFont !== undefined) {
+          cuFont = settings.usePonomarFont ? 'Ponomar' : '';
+        }
+        const useFont = cuFont !== '' || settings.usePonomarFont !== false;
+        return (this.language === 'cu') && useFont ? fontClass(cuFont) : '';
+      }
+    } catch {}
+    return this.language === 'cu' ? 'font-ponomar' : '';
+  }
+
+  /** Lightweight dRank computation for calendar grid highlighting */
+  private getDayRank(date: JDate, julianYear: number): number {
+    const month = date.getMonth();
+    const day = date.getDay();
+    const pascha = Paschalion.getPascha(julianYear);
+    const nday = date.difference(pascha);
+    const isBrightWeek = nday >= 0 && nday <= 6;
+
+    if (month === 9 && day === 14) return 6;
+    if (month === 8 && day === 29) return 6;
+    if (nday === 0) return 8;
+    if (nday === 49) return 8;
+    if (nday === 39) return 8;
+    if (nday === -7) return 8;
+    if (month === 12 && day === 25) return 6;
+    if (month === 1 && day === 6) return 6;
+    if (month === 8 && day === 15) return 6;
+    if (month === 3 && day === 25) return 6;
+    if (nday >= -48 && nday < 0) return 3;
+    if (isBrightWeek || (nday >= 49 && nday <= 56)) return 5;
+    return 0;
+  }
+
+  render() {
+    const useGregorian = this.calendarType === 'gregorian';
+    const fnClass = this.getFontClass();
+
+    function daysInGregorianMonth(m: number, y: number): number {
+      const dim = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+      if (m === 2 && ((y % 4 === 0 && y % 100 !== 0) || y % 400 === 0)) return 29;
+      return dim[m - 1];
+    }
+
+    const julianYear = this.currentDate.getYear();
+    const julianMonth = this.currentDate.getMonth();
+    const julianDay = this.currentDate.getDay();
+
+    // Grid display params: Julian or Gregorian based on setting
+    let month: number, year: number, day: number;
+    if (useGregorian) {
+      const g = this.currentDate.toGregorian();
+      year = g.getFullYear();
+      month = g.getMonth() + 1;
+      day = g.getDate();
+    } else {
+      year = julianYear;
+      month = julianMonth;
+      day = julianDay;
+    }
+
+    let firstDow: number;
+    let daysInMonth: number;
+    if (useGregorian) {
+      const firstJulian = JDate.fromGregorianParts(year, month, 1);
+      firstDow = firstJulian.getDayOfWeek();
+      daysInMonth = daysInGregorianMonth(month, year);
+    } else {
+      const firstOfMonth = new JDate(month, 1, year);
+      firstDow = firstOfMonth.getDayOfWeek();
+      daysInMonth = JDate.maxDaysInMonth(month, year);
+    }
+
+    const fasts = Paschalion.getFasts(julianYear);
+
+    let gridHtml = '';
+    let col = 0;
+
+    gridHtml += this.t.calendar.dayNames.map(d =>
+      `<div class="text-center text-xs font-bold text-navy-light py-1">${d}</div>`
+    ).join('');
+
+    for (let i = 0; i < firstDow; i++) {
+      gridHtml += '<div></div>';
+      col++;
+    }
+
+    for (let d = 1; d <= daysInMonth; d++) {
+      let fast = 0;
+      let isSelected = false;
+      let isToday = false;
+      let dayRank = 0;
+      if (useGregorian) {
+        const jDate = JDate.fromGregorianParts(year, month, d);
+        const dayDoy = jDate.getDoy();
+        fast = fasts[dayDoy] ?? 0;
+        isSelected = d === day;
+        dayRank = this.getDayRank(jDate, julianYear);
+        const todayGreg = JDate.today().toGregorian();
+        isToday = todayGreg.getFullYear() === year && todayGreg.getMonth() + 1 === month && todayGreg.getDate() === d;
+      } else {
+        const date = new JDate(month, d, year);
+        const dayDoy = date.getDoy();
+        fast = fasts[dayDoy] ?? 0;
+        isSelected = d === day;
+        dayRank = this.getDayRank(date, julianYear);
+        isToday = date.equals(JDate.today());
+      }
+
+      let classes = 'day-cell p-1 text-center text-sm cursor-pointer rounded transition-colors ';
+      if (isSelected) classes += 'bg-navy text-parchment font-bold ';
+      else if (isToday) classes += 'bg-gold/20 font-bold ';
+      else if (dayRank >= 6) classes += 'bg-red-100 text-red-800 font-bold ';
+      else if (fast === 1) classes += 'bg-purple-50 ';
+      else if (fast === 2) classes += 'bg-blue-50 ';
+
+      gridHtml += `<div class="${classes}" data-day="${d}">${d}</div>`;
+
+      col++;
+    }
+
+    const computed = computeDay(this.currentDate);
+
+
+
+    // Get Gregorian date for display
+    const gregorianDate = this.currentDate.toGregorian();
+    const gregorianDayName = this.t.calendar.dayNamesFull[gregorianDate.getDay()];
+    const gregorianStr = `${gregorianDayName}, ${gregorianDate.getDate()} ${this.t.calendar.monthsGenitive[gregorianDate.getMonth()]} ${gregorianDate.getFullYear()} г.`;
+    // Julian date (church calendar)
+    const julianDayName = this.t.calendar.dayNamesFull[this.currentDate.getDayOfWeek()];
+    // Anno Mundi year (Old Slavonic year = year + 5508)
+    const annoMundi = julianYear + 5508;
+    const julianStr = `${julianDayName}, ${this.currentDate.getDay()} ${this.t.calendar.monthsGenitive[this.currentDate.getMonth() - 1]}, год ${julianYear} ${this.t.calendar.fromYear}, ${annoMundi} ${this.t.calendar.fromAdam}`;
+
+    this.container.innerHTML = `
+      <div class="flex flex-col lg:flex-row h-full">
+        <div class="lg:w-80 bg-parchment-dark border-r border-gold/20 p-4 flex-shrink-0">
+          <div class="flex items-center justify-between mb-4">
+            <button id="prev-month" class="p-2 hover:bg-navy/10 rounded">◀</button>
+            <span class="font-bold text-navy">${this.t.calendar.months[month - 1]} ${year}</span>
+            <button id="next-month" class="p-2 hover:bg-navy/10 rounded">▶</button>
+          </div>
+
+          <div class="grid grid-cols-7 gap-0.5 text-xs">
+            ${gridHtml}
+          </div>
+
+          </div>
+
+        </div>
+
+        <div class="flex-1 p-6 overflow-auto">
+          <div class="max-w-2xl">
+            <h2 class="text-base font-bold text-navy mb-1">
+              ${julianStr}
+            </h2>
+            <div class="text-sm text-navy-light mb-2">
+              ${this.t.calendar.gregorianDate[0].toLowerCase() + this.t.calendar.gregorianDate.slice(1)}: ${gregorianStr}
+            </div>
+
+            <div id="day-title" class="mb-4"></div>
+
+            <div id="commemorations-panel" class="mb-4 p-4 bg-white/50 border border-gold/20 rounded-lg ${fnClass}">
+              <h3 class="font-bold text-navy mb-2">${this.t.calendar.commemorations}</h3>
+              <p class="text-sm text-navy-light italic">${this.t.loading}</p>
+            </div>
+
+            <div id="fasting-panel" class="mb-4 p-4 bg-white/50 border border-gold/20 rounded-lg ${fnClass}">
+              <h3 class="font-bold text-navy mb-2">${this.t.calendar.fastingRule}</h3>
+              <p class="text-sm italic text-navy-light">${this.t.loading}</p>
+            </div>
+
+            <div id="readings-panel" class="mb-4 p-4 bg-white/50 border border-gold/20 rounded-lg ${fnClass}">
+              <h3 class="font-bold text-navy mb-2">${this.t.calendar.readings}</h3>
+              <p class="text-sm text-navy-light italic">${this.t.loading}</p>
+            </div>
+
+            <div id="services-panel" class="mb-4 border-t border-gold/20 pt-6"></div>
+          </div>
+        </div>
+      </div>
+    `;
+
+    // Load data asynchronously
+    this.loadData(computed);
+
+    // Event listeners
+    document.getElementById('prev-month')?.addEventListener('click', () => {
+      const prevMonth = month <= 1 ? 12 : month - 1;
+      const prevYear = month <= 1 ? year - 1 : year;
+      if (useGregorian) {
+        const prevDay = Math.min(day, daysInGregorianMonth(prevMonth, prevYear));
+        this.currentDate = JDate.fromGregorianParts(prevYear, prevMonth, prevDay);
+      } else {
+        const prevDay = Math.min(day, JDate.maxDaysInMonth(prevMonth, prevYear));
+        this.currentDate = new JDate(prevMonth, prevDay, prevYear);
+      }
+      this.onDateChange(this.currentDate);
+      this.render();
+    });
+
+    document.getElementById('next-month')?.addEventListener('click', () => {
+      const nextMonth = month >= 12 ? 1 : month + 1;
+      const nextYear = month >= 12 ? year + 1 : year;
+      if (useGregorian) {
+        const nextDay = Math.min(day, daysInGregorianMonth(nextMonth, nextYear));
+        this.currentDate = JDate.fromGregorianParts(nextYear, nextMonth, nextDay);
+      } else {
+        const nextDay = Math.min(day, JDate.maxDaysInMonth(nextMonth, nextYear));
+        this.currentDate = new JDate(nextMonth, nextDay, nextYear);
+      }
+      this.onDateChange(this.currentDate);
+      this.render();
+    });
+
+    this.container.querySelectorAll('.day-cell').forEach(el => {
+      el.addEventListener('click', () => {
+        const d = parseInt(el.getAttribute('data-day')!, 10);
+        if (useGregorian) {
+          this.currentDate = JDate.fromGregorianParts(year, month, d);
+        } else {
+          this.currentDate = new JDate(month, d, year);
+        }
+        this.onDateChange(this.currentDate);
+        this.render();
+      });
+    });
+  }
+
+  private async loadData(computed: { dayInfo: import('../core/types').DayInfo; evalContext: import('../core/types').EvalContext }) {
+    const { dayInfo, evalContext } = computed;
+    this.skipCids = new Set();
+
+    // Load fasting
+    const fastingPeriods = await loadFastingPeriods();
+    const fastingResult = evaluateFasting(fastingPeriods, evalContext, this.language);
+    const fastingPanel = document.getElementById('fasting-panel');
+    if (fastingPanel) {
+      fastingPanel.innerHTML = `
+        <h3 class="font-bold text-navy mb-2">${this.t.calendar.fastingRule}</h3>
+        <p class="text-sm">${fastingResult.description || this.t.notAvailable}</p>
+      `;
+    }
+
+    // Load commemorations from menaion (language-specific)
+    const menaion = await loadMenaion(this.language, dayInfo.month, dayInfo.day);
+
+    // Load triodion/pentecostarion entries (shared, language-agnostic)
+    let calendarEntries: unknown[] = [];
+    if (dayInfo.triodionFile !== null) {
+      calendarEntries = await loadTriodionFile(dayInfo.triodionFile);
+    } else if (dayInfo.pentecostarionFile !== null) {
+      calendarEntries = await loadPentecostarionFile(dayInfo.pentecostarionFile);
+    }
+
+    // Collect CIds from all entries
+    const cids: string[] = [];
+    const allEntries = [...calendarEntries, ...menaion];
+    for (const entry of allEntries) {
+      if (typeof entry === 'object' && entry !== null) {
+        const e = entry as Record<string, unknown>;
+        if (e.CId) cids.push(String(e.CId));
+      }
+    }
+
+    // Load commemorations from BOTH sources:
+    // 1. Lives (language-specific, for names & life text)
+    // 2. Shared commemorations (for readings, rank, troparion/kontakion)
+    // Use CID_TO_SHARED_COMM mapping for known feast days
+    const livesData: Map<string, LifeData> = new Map();
+    const sharedComms: Map<string, CommemorationData> = new Map();
+    
+    for (const cid of cids.slice(0, 30)) {
+      const [life, shared] = await Promise.all([
+        loadLife(this.language, cid),
+        loadCommemoration(CID_TO_SHARED_COMM[cid] || cid),
+      ]);
+      if (life) livesData.set(cid, life);
+      if (shared) sharedComms.set(cid, shared);
+    }
+
+    // Build day title: period description + tone + great feast
+    const titleEl = document.getElementById('day-title');
+    if (titleEl) {
+      let periodName = '';
+      let periodCid = '';
+      let feastCid = '';
+      let feastName = '';
+      let feastRank = 0;
+
+      // Pass 1: Find period name from primary calendar entry (SId ''/'0' + CId 9[0-38]xxxx)
+      for (const entry of calendarEntries) {
+        const e = entry as Record<string, unknown>;
+        const cid = String(e.CId || '');
+        const sid = String(e.SId ?? '');
+        if (!cid || !/^9[0-38]\d{2}$/.test(cid)) continue;
+        if (sid !== '' && sid !== '0') continue;
+        const name = getPeriodName(livesData.get(cid)) || getCommsName(sharedComms.get(cid));
+        if (!name) continue;
+        periodName = name;
+        periodCid = cid;
+        break;
+      }
+
+      // Pass 2: Find great feast (rank >= 6) from all entries
+      for (const entry of allEntries) {
+        const e = entry as Record<string, unknown>;
+        const cid = String(e.CId || '');
+        if (!cid || this.skipCids.has(cid)) continue;
+        const life = livesData.get(cid);
+        const shared = sharedComms.get(cid);
+        const name = getShortFeastName(life, shared);
+        if (!name) continue;
+        const rank = parseInt(shared?.CHURCH?.Rank || '0', 10) || (life?.rank as number) || 0;
+        if (rank >= 6 && rank > feastRank) {
+          feastRank = rank;
+          feastName = name;
+          feastCid = cid;
+        }
+      }
+
+      // Skip period CId from commemorations if not a feast
+      if (periodCid && !feastCid) this.skipCids.add(periodCid);
+
+      if (!periodName) periodName = this.t.calendar.rankLabels[dayInfo.dRank] ?? '';
+
+      if (periodName) {
+        const tone = dayInfo.Tone;
+        const toneSuffix = tone > 0 ? `; ${this.t.calendar.tone}${tone}` : '';
+        const feastSuffix = feastName && feastCid !== periodCid ? `; ${feastName}` : '';
+        const titleColor = feastName ? 'text-red-700' : 'text-navy';
+        titleEl.innerHTML = `<span class="text-base font-semibold ${titleColor} italic">${periodName}${toneSuffix}${feastSuffix}</span>`;
+      }
+
+      if (feastCid) this.skipCids.add(feastCid);
+    }
+
+    // Load commemorations for each CId
+    const commPanel = document.getElementById('commemorations-panel');
+    if (commPanel) {
+      if (cids.length === 0) {
+        commPanel.innerHTML = `
+          <h3 class="font-bold text-navy mb-2">${this.t.calendar.commemorations}</h3>
+          <p class="text-sm text-navy-light italic">${this.t.calendar.noCommemorations}</p>
+        `;
+      } else {
+        const commHtmlParts: string[] = [];
+        for (const cid of cids.slice(0, 15)) {
+          if (this.skipCids.has(cid)) continue;
+          // Prefer shared commemoration for name (feast days), fallback to lives (saints)
+          const shared = sharedComms.get(cid);
+          const life = livesData.get(cid);
+          
+          const lifeText = life?.life?.text || (shared?.LIFE as any)?.text || '';
+
+          let name = '';
+          if (life?.name) {
+            name = life.name['@_Nominative'] || life.name.nominative || life.name['@_Short'] || life.name.short || '';
+          }
+          if (!name && shared?.NAME) {
+            if (typeof shared.NAME === 'object' && 'Long' in shared.NAME) {
+              name = shared.NAME.Long || shared.NAME.ShortN || '';
+            } else if (typeof shared.NAME === 'object' && 'text' in shared.NAME) {
+              name = (shared.NAME as { text: string }).text || '';
+            }
+          }
+          if (name) {
+            // Determine rank: shared commemoration rank > day rank
+            const rank = parseInt(shared?.CHURCH?.Rank || '0', 10) || (life?.rank as number) || dayInfo.dRank || 0;
+            const icon = this.t.calendar.rankIcons[rank] || '';
+            const iconHtml = icon ? `<span class="font-slavonic text-lg mr-1">${icon}</span>` : '';
+            const lifeHtml = lifeText
+              ? `<div class="life-text hidden mt-2 p-3 bg-white border border-gold/20 rounded text-sm leading-relaxed max-h-60 overflow-y-auto">${lifeText}</div>`
+              : '';
+            commHtmlParts.push(
+              `<div class="comm-item">
+                <div class="text-sm font-medium ${lifeText ? 'text-blue-600 underline cursor-pointer hover:text-blue-800' : 'text-navy'}">${iconHtml}${name}</div>
+                ${lifeHtml}
+              </div>`
+            );
+          }
+        }
+        if (commHtmlParts.length > 0) {
+          commPanel.innerHTML = `
+            <h3 class="font-bold text-navy mb-2">${this.t.calendar.commemorations}</h3>
+            <div class="space-y-1">${commHtmlParts.join('')}</div>
+          `;
+          commPanel.addEventListener('click', (e) => {
+            const target = e.target as HTMLElement;
+            const item = target.closest('.comm-item');
+            if (item) {
+              const lifeDiv = item.querySelector('.life-text') as HTMLElement;
+              if (lifeDiv) lifeDiv.classList.toggle('hidden');
+            }
+          });
+        } else {
+          commPanel.innerHTML = `
+            <h3 class="font-bold text-navy mb-2">${this.t.calendar.commemorations}</h3>
+            <p class="text-sm text-navy-light italic">${this.t.calendar.noCommemorations}</p>
+          `;
+        }
+      }
+    }
+
+    // Collect readings grouped by service
+    const readingsGroups: ReadingsGroup[] = [];
+    const addReading = (service: string, reading: string, purpose: string) => {
+      const group = findOrCreateGroup(readingsGroups, service);
+      const ref = formatReadingRef(reading, this.language);
+      if (!group.items.some(i => i.ref === ref)) {
+        group.items.push({ ref, purpose });
+      }
+    };
+    const isPeriodCid = (cid: string): boolean => /^9[0-38]\d{2}$/.test(cid);
+    const readingContext = (shortName: string, cid?: string): string => {
+      if (!shortName) return '';
+      if (cid && isPeriodCid(cid)) return '';
+      return ` (${shortName})`;
+    };
+    loadBookAbbrevs(this.language);
+    for (const [cid, shared] of sharedComms) {
+      if (shared?.SCRIPTURE) {
+        const shortN = typeof shared.NAME === 'object' && 'ShortN' in shared.NAME ? (shared.NAME.ShortN || '') : '';
+        const tag = readingContext(shortN, cid);
+        const scripts = Array.isArray(shared.SCRIPTURE) ? shared.SCRIPTURE : [shared.SCRIPTURE];
+        for (const s of scripts) {
+          if (s && typeof s === 'object') {
+            const sr = s as Record<string, string>;
+            if (sr.Reading) {
+              const svc = readingsTypeToService(sr.Type || '', this.t);
+              addReading(svc, sr.Reading, tag);
+            }
+          }
+        }
+      }
+    }
+    // Also load readings from saint lives (from services structure)
+    for (const [cid, life] of livesData) {
+      const shortName = life?.name?.['@_Short'] || life?.name?.short || '';
+      const tag = readingContext(shortName, cid);
+
+      if (life?.services) {
+        const svcMap = life.services as Record<string, Record<string, Record<string, string>>>;
+        for (const [svcName, scriptures] of Object.entries(svcMap)) {
+          for (const [, sc] of Object.entries(scriptures)) {
+            const reading = sc.Reading || sc.reading;
+            if (!reading) continue;
+            const scType = sc.Type || sc.type || '';
+            const svc = svcNameToService(svcName, scType, this.t);
+            addReading(svc, reading, tag);
+          }
+        }
+      } else if (life?.scripture) {
+        for (const s of life.scripture) {
+          const sc = s as Record<string, string>;
+          const reading = sc.Reading || sc.reading;
+          if (reading) {
+            const svc = readingsTypeToService(sc.Type || sc.type || '', this.t);
+            addReading(svc, reading, tag);
+          }
+        }
+      }
+    }
+    // Also check calendar entries for Scripture
+    for (const entry of allEntries) {
+      if (typeof entry === 'object' && entry !== null) {
+        const e = entry as Record<string, unknown>;
+        if (e.Scripture && typeof e.Scripture === 'object') {
+          const s = e.Scripture as Record<string, string>;
+          if (s.Reading) {
+            const svc = readingsTypeToService(s.Type || '', this.t);
+            addReading(svc, s.Reading, '');
+          }
+        }
+      }
+    }
+
+    const readingsPanel = document.getElementById('readings-panel');
+    if (readingsPanel) {
+      if (readingsGroups.length === 0) {
+        readingsPanel.innerHTML = `
+          <h3 class="font-bold text-navy mb-2">${this.t.calendar.readings}</h3>
+          <p class="text-sm text-navy-light italic">${this.t.calendar.noReadings}</p>
+        `;
+      } else {
+        const sorted = [...readingsGroups].sort((a, b) => {
+          const ai = SERVICE_ORDER.indexOf(a.service);
+          const bi = SERVICE_ORDER.indexOf(b.service);
+          return (ai === -1 ? 999 : ai) - (bi === -1 ? 999 : bi);
+        });
+        const groupsHtml = sorted.map(g => {
+          // Group consecutive items with same purpose; tag only on last of each group
+          let refs = '';
+          for (let i = 0; i < g.items.length; i++) {
+            const item = g.items[i];
+            const next = g.items[i + 1];
+            if (i > 0) refs += this.t.calendar.readSep;
+            refs += item.ref;
+            if (!next || next.purpose !== item.purpose) {
+              refs += item.purpose;
+            }
+          }
+          return `<div class="text-sm text-navy"><strong>${g.service}</strong>${this.t.calendar.colon}${refs}</div>`;
+        }).join('');
+        readingsPanel.innerHTML = `
+          <h3 class="font-bold text-navy mb-2">${this.t.calendar.readings}</h3>
+          <div class="space-y-1">${groupsHtml}</div>
+        `;
+      }
+    }
+
+    // Load services
+    const svcPanel = document.getElementById('services-panel');
+    if (svcPanel) {
+      svcPanel.innerHTML = '';
+      try {
+        const svcView = new ServiceView(svcPanel, this.currentDate, this.language);
+        await svcView.render(false);
+      } catch {
+        svcPanel.innerHTML = `<p class="text-sm text-navy-light italic">${this.t.loading}</p>`;
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/ui/service-view.ts b/src/ui/service-view.ts
new file mode 100644
index 0000000..821afa7
--- /dev/null
+++ b/src/ui/service-view.ts
@@ -0,0 +1,712 @@
+/**
+ * Service view — displays assembled liturgical services.
+ * Loads XML templates (converted to JSON) and assembles them with
+ * dynamic Var nodes from Octoecheos tone data.
+ */
+
+import { JDate } from '../core/jdate';
+import { computeDay } from '../core/day-computer';
+import { assembleService, type ServiceContext } from '../core/service-assembler';
+import { evalBool } from '../core/evaluator';
+import type { EvalContext, ServiceNode } from '../core/types';
+import { getTranslations, type LanguageCode } from '../core/i18n';
+import { loadSettings, fontClass } from './settings-view';
+
+interface ServiceDef {
+  id: string;
+  name: string;
+  serviceType: string;
+  template: string;
+  description: string;
+  titleNode: ServiceNode;
+}
+
+function title(value: string, header?: string, source?: string, comment?: string): ServiceNode {
+  return { type: 'TITLE', value, header: header ?? value, source, comment };
+}
+
+const WEEKDAY_NAMES = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
+
+export class ServiceView {
+  private container: HTMLElement;
+  private currentDate: JDate;
+  private evalContext: EvalContext;
+  private language: LanguageCode;
+  private t: ReturnType<typeof getTranslations>;
+  private jsonCache = new Map<string, Record<string, unknown>[]>();
+  private nodeCache = new Map<string, ServiceNode[]>();
+  private notFound = new Set<string>();
+  private bibleCache = new Map<string, string>();
+  private livesCache = new Map<string, Record<string, Record<string, Record<string, unknown>>>>();
+  private commandCache = new Map<string, string>();
+  private timesCache = new Map<string, { cmd: string; value: string }[]>();
+  private activeService: string | null = null;
+
+  constructor(container: HTMLElement, date: JDate, language: LanguageCode = 'en') {
+    this.container = container;
+    this.currentDate = date;
+    this.evalContext = computeDay(date).evalContext;
+    this.language = language;
+    this.t = getTranslations(language);
+  }
+
+  private getFontClass(): string {
+    const settings = loadSettings();
+    return (this.language === 'cu' || this.language === 'ru') && settings.cuFont !== undefined ? fontClass(settings.cuFont) : '';
+  }
+
+  private get serviceLang(): string {
+    return this.language === 'ru' ? 'cu' : this.language;
+  }
+
+  async render(standalone = true) {
+    const computed = computeDay(this.currentDate);
+    const { dayInfo } = computed;
+
+    const availableServices = this.getAvailableServices(dayInfo);
+    const fontClass = this.getFontClass();
+
+    const contentClass = `bg-white/50 border border-gold/20 rounded-lg p-6 ${this.activeService ? 'min-h-[300px]' : ''} ${fontClass}`;
+
+    const tabHtml = `
+      <h3 class="font-bold text-navy mb-3">${this.t.services.title}</h3>
+      <div class="flex flex-wrap gap-1 mb-6 border-b border-gold/20">
+        ${availableServices.map(s => `
+          <button
+            class="service-tab px-4 py-2 text-sm border-b-2 transition-colors whitespace-nowrap
+              ${this.activeService === s.id
+                ? 'border-gold text-navy font-bold'
+                : 'border-transparent text-navy-light hover:text-navy hover:border-gold/50'}"
+            data-service="${s.id}"
+          >${s.name}</button>
+        `).join('')}
+      </div>
+
+      <div id="service-content" class="${contentClass}">
+        <p class="text-navy-light italic">${this.t.services.selectService}</p>
+      </div>
+    `;
+
+    this.container.innerHTML = standalone
+      ? `<div class="p-6 max-w-4xl mx-auto">
+          <h2 class="text-2xl font-bold text-navy mb-2">${this.t.services.title}</h2>
+          <p class="text-navy-light mb-4">
+            ${this.currentDate.toString()}
+            ${dayInfo.isLent ? this.t.services.greatLent : ''}
+            ${dayInfo.isBrightWeek ? this.t.services.brightWeek : ''}
+            ${dayInfo.isApostlesFast ? this.t.services.apostlesFast : ''}
+            ${dayInfo.isDormitionFast ? this.t.services.dormitionFast : ''}
+            ${dayInfo.isNativityFast ? this.t.services.nativityFast : ''}
+            ${dayInfo.Tone > 0 ? `${this.t.services.tone}${dayInfo.Tone}` : ''}
+          </p>
+          ${tabHtml}
+        </div>`
+      : tabHtml;
+
+    this.container.querySelectorAll('.service-tab').forEach(btn => {
+      btn.addEventListener('click', () => {
+        const serviceId = btn.getAttribute('data-service')!;
+        const service = availableServices.find(s => s.id === serviceId);
+        if (service) {
+          this.activeService = serviceId;
+          this.container.querySelectorAll('.service-tab').forEach(t => {
+            const id = t.getAttribute('data-service');
+            if (id === serviceId) {
+              t.className = 'service-tab px-4 py-2 text-sm border-b-2 transition-colors whitespace-nowrap border-gold text-navy font-bold';
+            } else {
+              t.className = 'service-tab px-4 py-2 text-sm border-b-2 transition-colors whitespace-nowrap border-transparent text-navy-light hover:text-navy';
+            }
+          });
+          this.loadService(service);
+        }
+      });
+    });
+  }
+
+  private getAvailableServices(dayInfo: import('../core/types').DayInfo): ServiceDef[] {
+    const services: ServiceDef[] = [];
+
+    services.push({
+      id: 'primes', name: this.t.services.serviceNames.primes, serviceType: 'PRIMES',
+      template: 'Prime',
+      description: this.t.services.serviceDescriptions.primes,
+      titleNode: title('Primes1', this.t.services.serviceNames.primes, 'PrimeSource'),
+    });
+
+    services.push({
+      id: 'third', name: this.t.services.serviceNames.third, serviceType: 'TERCE',
+      template: 'ThirdHour',
+      description: this.t.services.serviceDescriptions.third,
+      titleNode: title('Third1', this.t.services.serviceNames.third),
+    });
+
+    services.push({
+      id: 'sixth', name: this.t.services.serviceNames.sixth, serviceType: 'SEXTE',
+      template: 'SixthHour',
+      description: this.t.services.serviceDescriptions.sixth,
+      titleNode: title('Sixth1', this.t.services.serviceNames.sixth),
+    });
+
+    services.push({
+      id: 'ninth', name: this.t.services.serviceNames.ninth, serviceType: 'NONE',
+      template: 'NinthHour',
+      description: this.t.services.serviceDescriptions.ninth,
+      titleNode: title('Ninth1', this.t.services.serviceNames.ninth),
+    });
+
+    if (dayInfo.dRank >= 6) {
+      services.push({
+        id: 'royalhours', name: this.t.services.serviceNames.royalhours, serviceType: 'ROYALHOURS',
+        template: 'RoyalHours',
+        description: this.t.services.serviceDescriptions.royalhours,
+        titleNode: title('RoyalHours1', this.t.services.serviceNames.royalhours),
+      });
+    }
+
+    return services;
+  }
+
+  private async loadToneData(serviceType: string): Promise<{ troparion1?: string; kontakion1?: string } | null> {
+    const computed = computeDay(this.currentDate);
+    const { dayInfo } = computed;
+    const tone = dayInfo.Tone;
+    const dow = dayInfo.dow;
+    const mm = String(dayInfo.month).padStart(2, '0');
+    const dd = String(dayInfo.day).padStart(2, '0');
+    const dateKey = `${mm}-${dd}`;
+
+    let result: { troparion1?: string; kontakion1?: string } | null = null;
+
+    if (tone > 0 && tone <= 8) {
+      const toneNum = tone === 8 ? 0 : tone;
+      const weekday = WEEKDAY_NAMES[dow];
+
+      try {
+        const tryFetch = async (lang: string) => {
+          const url = `/data/${lang}/services/Octoecheos/Tone ${toneNum}/${weekday}.json`;
+          const resp = await fetch(url);
+          if (!resp.ok) return null;
+          const nodes: ServiceNode[] = await resp.json();
+          for (const node of nodes) {
+            if (node.type === serviceType && node.cmd) {
+              if (evalBool(node.cmd as string, this.evalContext)) {
+                return {
+                  troparion1: node.troparion1 as string | undefined,
+                  kontakion1: node.kontakion1 as string | undefined,
+                };
+              }
+            }
+          }
+          return null;
+        };
+
+        result = await tryFetch(this.serviceLang);
+        if (!result && this.serviceLang !== 'cu') result = await tryFetch('cu');
+        if (!result) result = await tryFetch('shared');
+      } catch { /* fall through to menologion */ }
+    }
+
+    // Menologion fallback when Octoecheos has no valid entry
+    if (!result) {
+      try {
+        const tryLoad = async (url: string): Promise<{ cid: string }[] | null> => {
+          try {
+            const resp = await fetch(url);
+            if (!resp.ok) return null;
+            const all = await resp.json();
+            if (Array.isArray(all)) return all.map((e: Record<string, unknown>) => ({ cid: String(e.CId ?? '') }));
+            const entries = all[dateKey] as Record<string, unknown>[] | undefined;
+            if (Array.isArray(entries)) return entries.map((e: Record<string, unknown>) => ({ cid: String(e.CId ?? '') }));
+            return null;
+          } catch { return null; }
+        };
+
+        const allEntries: { cid: string }[] = [];
+
+        const menaionEntries = await tryLoad(`/data/${this.serviceLang}/menaion-bundle.json`);
+        if (menaionEntries) allEntries.push(...menaionEntries);
+
+        if (dayInfo.triodionFile !== null) {
+          const triodion = await tryLoad(`/data/shared/triodion/${dayInfo.triodionFile}.json`);
+          if (triodion) allEntries.push(...triodion);
+        }
+        if (dayInfo.pentecostarionFile !== null) {
+          const pent = await tryLoad(`/data/shared/pentecostarion/${dayInfo.pentecostarionFile}.json`);
+          if (pent) allEntries.push(...pent);
+        }
+
+        const TONE_NUM = ['', 'а҃', 'в҃', 'г҃', 'д҃', 'є҃', 'ѕ҃', 'з҃', 'и҃'];
+        for (const entry of allEntries) {
+          if (!entry.cid) continue;
+          try {
+            const shmResp = await fetch(`/data/shared/commemorations/${entry.cid}.json`);
+            if (!shmResp.ok) continue;
+            const shm = await shmResp.json();
+            const troparion = shm.TROPARION as { Tone?: string; text?: string } | undefined;
+            const kontakion = shm.KONTAKION as { Tone?: string; text?: string } | undefined;
+            if (troparion?.text || kontakion?.text) {
+              const key = `MEN_${entry.cid}`;
+
+              if (troparion?.text) {
+                const tn = TONE_NUM[parseInt(troparion.Tone ?? '1', 10)] ?? troparion.Tone ?? '1';
+                this.jsonCache.set(`/data/${this.serviceLang}/services/CommonPrayers/TROPARION/${key}.json`, [
+                  { type: 'HEADER', value: `Тропа́рь, гла́съ ${tn}` },
+                  { type: 'TEXT', value: troparion.text },
+                ]);
+              }
+
+              if (kontakion?.text) {
+                const tn = TONE_NUM[parseInt(kontakion.Tone ?? '1', 10)] ?? kontakion.Tone ?? '1';
+                this.jsonCache.set(`/data/${this.serviceLang}/services/CommonPrayers/KONTAKION/${key}.json`, [
+                  { type: 'HEADER', value: `Конда́къ, гла́съ ${tn}` },
+                  { type: 'TEXT', value: kontakion.text },
+                ]);
+              }
+
+              result = { troparion1: key, kontakion1: key };
+              break;
+            }
+          } catch { continue; }
+        }
+      } catch { /* fall through to tertiary fallback */ }
+    }
+
+    // Tertiary fallback: known feasts not yet in shared commemorations
+    if (!result) {
+      const MENAION_TROP: Record<string, { troparion1: string; kontakion1: string }> = {
+        '03-23': { troparion1: 'PROPHET', kontakion1: 'PROPHET' },
+        '03-22': { troparion1: 'PROPHET', kontakion1: 'PROPHET' },
+      };
+      const m = MENAION_TROP[dateKey];
+      if (m) result = m;
+    }
+
+    return result;
+  }
+
+  private generateVarNodes(toneData: { troparion1?: string; kontakion1?: string } | null, serviceType: string): Map<string, ServiceNode[]> {
+    const varNodes = new Map<string, ServiceNode[]>();
+
+    const prefix: Record<string, string> = { PRIMES: '', TERCE: '3', SEXTE: '6', NONE: '9' };
+    const p = prefix[serviceType] ?? '';
+
+    if (toneData?.troparion1) {
+      const key1 = `PTrop${p}1`;
+      varNodes.set(key1, [{
+        type: 'CREATE',
+        what: `TROPARION/${toneData.troparion1}`,
+        who: '',
+        header: true,
+        redfirst: true,
+        newline: true,
+      }]);
+    }
+
+    if (toneData?.kontakion1) {
+      const key = p ? `PKont${p}` : 'PKont1';
+      varNodes.set(key, [{
+        type: 'CREATE',
+        what: `KONTAKION/${toneData.kontakion1}`,
+        who: '',
+        header: true,
+        redfirst: true,
+        newline: true,
+      }]);
+    }
+
+    return varNodes;
+  }
+
+  private async loadService(service: ServiceDef) {
+    const contentEl = document.getElementById('service-content');
+    if (!contentEl) return;
+
+    contentEl.innerHTML = `<p class="text-navy-light italic">${this.t.loading}</p>`;
+
+    try {
+      const templateNodes = await this.fetchServiceNodes(`Services/${service.template}.json`);
+      if (!templateNodes) {
+        contentEl.innerHTML = `<p class="text-navy-light">Service template not found</p>`;
+        return;
+      }
+
+      const toneData = await this.loadToneData(service.serviceType);
+      const varNodes = this.generateVarNodes(toneData, service.serviceType);
+
+      const nodes: ServiceNode[] = [...templateNodes];
+
+      const computed = computeDay(this.currentDate);
+      const isMenologionTone = toneData?.troparion1?.startsWith('PROPHET') || toneData?.troparion1?.startsWith('MEN_');
+      const dayPFlag2 = computed.dayInfo.PFlag2;
+      const evalCtx: EvalContext = {
+        ...this.evalContext,
+        PFlag1: 0,
+        PFlag2: isMenologionTone && dayPFlag2 !== 0 ? 0 : dayPFlag2,
+        PFlag3: 0,
+        PS: 1,
+      };
+
+      const ctx: ServiceContext = {
+        evalCtx,
+        lang: this.serviceLang,
+        t: this.t,
+        fetchBibleText: (book, passage, showVerseNumbers, verseNewLine) => this.fetchBibleText(book, passage, showVerseNumbers, verseNewLine),
+        fetchLives: (id) => this.fetchLives(id),
+        fetchCommandText: (name) => this.fetchCommandText(name),
+        resolveTimes: (times) => this.resolveTimes(times),
+        fetchText: this.createFetchText(),
+        fetchServiceNodes: async (path: string): Promise<ServiceNode[] | null> => {
+          const varMatch = path.match(/Services\/Var\/(\w+)\.xml$/);
+          if (varMatch) {
+            return varNodes.get(varMatch[1]) || null;
+          }
+          return this.fetchServiceNodes(path);
+        },
+      };
+
+      const { html } = await assembleService(nodes, ctx);
+
+      if (html.trim()) {
+        const fontClass = this.getFontClass();
+        contentEl.className = `prose prose-sm max-w-none liturgical-text ${fontClass}`;
+        contentEl.innerHTML = html;
+      } else {
+        contentEl.className = 'prose prose-sm max-w-none liturgical-text';
+        contentEl.innerHTML = `
+          <div class="text-center py-8">
+            <p class="text-navy-light mb-2">${this.t.services.serviceProducedNoOutput}</p>
+            <p class="text-xs text-navy-light">${nodes.length} ${this.t.services.nodesAssembled}</p>
+          </div>
+        `;
+      }
+    } catch (err) {
+      contentEl.innerHTML = `
+        <div class="text-center py-8">
+          <p class="text-navy-light mb-2">${this.t.services.errorLoading}</p>
+          <p class="text-xs text-navy-light">${err instanceof Error ? err.message : this.t.error}</p>
+        </div>
+      `;
+    }
+  }
+
+  private bibleVersion(lang: string): string {
+    const map: Record<string, string> = {
+      en: 'kjv',
+      cu: 'elis',
+      fr: 'ls',
+      el: 'spt',
+      la: 'vulgate',
+      zh: 'cuv',
+      ar: 'svd',
+    };
+    return map[lang] || 'kjv';
+  }
+
+  private async fetchBibleText(book: string, passage: string, showVerseNumbers = true, verseNewLine = false): Promise<string> {
+    const cacheKey = `${this.language}/${book}/${passage}/${showVerseNumbers ? 'vn' : 'nn'}/${verseNewLine ? 'vb' : 'nvb'}`;
+    const cached = this.bibleCache.get(cacheKey);
+    if (cached) return cached;
+
+    const version = this.bibleVersion(this.serviceLang);
+    const tryFetch = async (lang: string): Promise<string | null> => {
+      const url = `/data/${lang}/bible/${version}/${book}.text`;
+      if (this.notFound.has(url)) return null;
+      const resp = await fetch(url);
+      if (!resp.ok) { this.notFound.add(url); return null; }
+      const ct = resp.headers.get('content-type');
+      if (ct && ct.includes('text/html')) { this.notFound.add(url); return null; }
+      return resp.text();
+    };
+
+    let text = await tryFetch(this.serviceLang);
+    if (!text && this.serviceLang !== 'cu') text = await tryFetch('cu');
+    if (!text) text = await tryFetch('shared');
+    if (!text) return '';
+
+    const lines = text.split('\n');
+    // Parse comma-separated passage parts, each potentially: Chapter[:VerseStart[-VerseEnd]]
+    const parts = passage.split(',');
+    const ranges: { chapter: number; vStart: number; vEnd: number }[] = [];
+
+    for (const part of parts) {
+      const trimmed = part.trim();
+      if (!trimmed) continue;
+
+      let chapter: number;
+      let verseSpec: string;
+
+      if (trimmed.includes(':')) {
+        const colonIdx = trimmed.indexOf(':');
+        chapter = parseInt(trimmed.substring(0, colonIdx), 10);
+        verseSpec = trimmed.substring(colonIdx + 1);
+      } else {
+        // Bare number = chapter number (e.g. "50" = Psalm 50, read all verses)
+        chapter = parseInt(trimmed, 10);
+        verseSpec = '1-';
+      }
+
+      let vStart: number;
+      let vEnd: number;
+
+      if (verseSpec.includes('-')) {
+        const dashIdx = verseSpec.indexOf('-');
+        vStart = parseInt(verseSpec.substring(0, dashIdx), 10);
+        const after = verseSpec.substring(dashIdx + 1);
+        // Check if after contains chapter:verse (cross-chapter range)
+        if (after.includes(':')) {
+          const afterColon = after.indexOf(':');
+          const nextChapter = parseInt(after.substring(0, afterColon), 10);
+          vEnd = parseInt(after.substring(afterColon + 1), 10);
+          ranges.push({ chapter, vStart, vEnd: -1 }); // all remaining verses in current chapter
+          chapter = nextChapter;
+          vStart = 1;
+          vEnd = vEnd;
+        } else {
+          vEnd = after ? parseInt(after, 10) : -1; // empty end = all remaining verses
+        }
+      } else {
+        vStart = parseInt(verseSpec, 10);
+        vEnd = vStart;
+      }
+
+      ranges.push({ chapter, vStart, vEnd });
+    }
+
+    // Scan file and collect matching verses
+    let result = '';
+    let curChapter = 0;
+
+    for (const line of lines) {
+      const trimmed = line.trim();
+      if (!trimmed) continue;
+
+      const chapterMatch = trimmed.match(/^#(\d+)/);
+      if (chapterMatch) {
+        curChapter = parseInt(chapterMatch[1], 10);
+        continue;
+      }
+
+      const verseMatch = trimmed.match(/^(\d+)\|(.*)/);
+      if (verseMatch) {
+        const curVerse = parseInt(verseMatch[1], 10);
+        const verseText = verseNewLine ? verseMatch[2].replace(/^ /, '') : verseMatch[2];
+
+        for (const range of ranges) {
+          if (range.chapter !== curChapter) continue;
+          if (curVerse < range.vStart) continue;
+          if (range.vEnd !== -1 && curVerse > range.vEnd) continue;
+          if (result) result += verseNewLine ? '<br>' : ' ';
+          result += showVerseNumbers ? `<sup>${curVerse}</sup>${verseText}` : verseText;
+          break;
+        }
+      } else if (trimmed.startsWith('*')) {
+        if (result) result += ' ';
+        result += trimmed;
+      }
+    }
+
+    this.bibleCache.set(cacheKey, result);
+    return result;
+  }
+
+  private async fetchLives(id: string): Promise<Record<string, Record<string, Record<string, unknown>>> | null> {
+    const cacheKey = `${this.language}/${id}`;
+    const cached = this.livesCache.get(cacheKey);
+    if (cached) return cached;
+
+    const bundleName = /^(0[1-9]|1[0-2])\d+/.test(id) ? id.substring(0, 2) : 'misc';
+    const tryFetch = async (lang: string): Promise<Record<string, Record<string, Record<string, unknown>>> | null> => {
+      const url = `/data/${lang}/lives/${bundleName}.json`;
+      if (this.notFound.has(url)) return null;
+      const resp = await fetch(url);
+      if (!resp.ok) { this.notFound.add(url); return null; }
+      const ct = resp.headers.get('content-type');
+      if (ct && ct.includes('text/html')) { this.notFound.add(url); return null; }
+      const bundle = await resp.json() as Record<string, Record<string, unknown>>;
+      const entry = bundle[id] as { services?: Record<string, Record<string, Record<string, unknown>>> } | undefined;
+      return entry?.services || null;
+    };
+
+    let result = await tryFetch(this.serviceLang);
+    if (!result && this.serviceLang !== 'cu') result = await tryFetch('cu');
+    if (!result) result = await tryFetch('shared');
+    if (result) this.livesCache.set(cacheKey, result);
+    return result;
+  }
+
+  private async fetchCommandText(name: string): Promise<string> {
+    const cacheKey = `${this.language}/Command/${name}`;
+    const cached = this.commandCache.get(cacheKey);
+    if (cached) return cached;
+
+    const tryFetch = async (lang: string): Promise<string | null> => {
+      const url = `/data/${lang}/services/Command/${name}.json`;
+      if (this.notFound.has(url)) return null;
+      const resp = await fetch(url);
+      if (!resp.ok) { this.notFound.add(url); return null; }
+      const ct = resp.headers.get('content-type');
+      if (ct && ct.includes('text/html')) { this.notFound.add(url); return null; }
+      const json = await resp.json() as Record<string, unknown>[];
+      return json
+        .filter(n => n.type === 'TEXT')
+        .map(n => String(n.value ?? ''))
+        .filter(Boolean)
+        .join(' ') || null;
+    };
+
+    let result = await tryFetch(this.serviceLang);
+    if (!result && this.serviceLang !== 'cu') result = await tryFetch('cu');
+    if (!result) result = await tryFetch('shared');
+    if (result) this.commandCache.set(cacheKey, result);
+    return result || '';
+  }
+
+  private async resolveTimes(times: number): Promise<string> {
+    const cacheKey = this.language;
+    let rules = this.timesCache.get(cacheKey);
+    if (!rules) {
+      const tryFetch = async (lang: string): Promise<{ cmd: string; value: string }[] | null> => {
+        const url = `/data/${lang}/commands/Times.json`;
+        if (this.notFound.has(url)) return null;
+        const resp = await fetch(url);
+        if (!resp.ok) { this.notFound.add(url); return null; }
+        const ct = resp.headers.get('content-type');
+        if (ct && ct.includes('text/html')) { this.notFound.add(url); return null; }
+        const json = await resp.json() as { DATA: { TIMES: { '@_Value': string; '@_Cmd': string }[] } };
+        const arr = json?.DATA?.TIMES;
+        if (!Array.isArray(arr)) return null;
+        return arr.map(r => ({ value: r['@_Value'], cmd: r['@_Cmd'] }));
+      };
+      let loaded = await tryFetch(this.serviceLang);
+      if (!loaded && this.serviceLang !== 'cu') loaded = await tryFetch('cu');
+      if (!loaded) loaded = await tryFetch('shared');
+      if (loaded) {
+        this.timesCache.set(cacheKey, loaded);
+        rules = loaded;
+      }
+    }
+
+    if (!rules) return `${times}×`;
+
+    for (const rule of rules) {
+      if (rule.cmd) {
+        if (evalBool(rule.cmd, { Times: times } as EvalContext)) {
+          return rule.value.replace('^#', String(times));
+        }
+      } else {
+        return rule.value.replace('^#', String(times));
+      }
+    }
+    return `${times}×`;
+  }
+
+  private createFetchText() {
+    return async (path: string): Promise<string | null> => {
+      const wantsHeader = path.endsWith('.header');
+      const basePath = wantsHeader ? path.slice(0, -'.header'.length) : path;
+
+      const resolvePath = (lang: string): string | null => {
+        let fetchPath = basePath;
+        if (fetchPath.startsWith('Services/')) {
+          fetchPath = fetchPath.replace('Services/', '').replace('.xml', '.json');
+        }
+        return `/data/${lang}/services/${fetchPath}`;
+      };
+
+      const fetchJson = async (url: string): Promise<Record<string, unknown>[] | null> => {
+        if (this.notFound.has(url)) return null;
+        const cached = this.jsonCache.get(url);
+        if (cached) return cached;
+        try {
+          const resp = await fetch(url);
+          if (!resp.ok) { this.notFound.add(url); return null; }
+          const ct = resp.headers.get('content-type');
+          if (ct && ct.includes('text/html')) { this.notFound.add(url); return null; }
+          const json = JSON.parse(await resp.text());
+          if (Array.isArray(json)) {
+            this.jsonCache.set(url, json);
+            return json;
+          }
+          this.notFound.add(url);
+          return null;
+        } catch {
+          this.notFound.add(url);
+          return null;
+        }
+      };
+
+      const filterNodes = (json: Record<string, unknown>[], header: boolean): string | null => {
+        if (header) {
+          return json
+            .filter(n => n.type === 'HEADER')
+            .map(n => String(n.value ?? ''))
+            .filter(Boolean)
+            .join(' ') || null;
+        }
+        return json
+          .filter(n => n.type === 'TEXT')
+          .map(n => String(n.value ?? '').replace(/\n/g, ' '))
+          .filter(Boolean)
+          .join('<br>') || null;
+      };
+
+      try {
+        let url = resolvePath(this.serviceLang);
+        let json = url ? await fetchJson(url) : null;
+        if (!json && this.serviceLang !== 'cu') {
+          url = resolvePath('cu');
+          json = url ? await fetchJson(url) : null;
+        }
+        if (!json) {
+          url = resolvePath('shared');
+          json = url ? await fetchJson(url) : null;
+        }
+        return json ? filterNodes(json, wantsHeader) : null;
+      } catch (err) {
+        console.error('Service fetchText error:', err);
+        return null;
+      }
+    };
+  }
+
+  private async fetchServiceNodes(path: string): Promise<ServiceNode[] | null> {
+    const resolvePath = (lang: string): string | null => {
+      let fetchPath = path;
+      if (fetchPath.startsWith('Services/')) {
+        fetchPath = fetchPath.replace('Services/', '').replace('.xml', '.json');
+      }
+      return `/data/${lang}/services/${fetchPath}`;
+    };
+    const tryFetch = async (url: string): Promise<ServiceNode[] | null> => {
+      if (this.notFound.has(url)) return null;
+      const cached = this.nodeCache.get(url);
+      if (cached) return cached;
+      try {
+        const resp = await fetch(url);
+        if (!resp.ok) { this.notFound.add(url); return null; }
+        const ct = resp.headers.get('content-type') || '';
+        if (ct.includes('text/html')) { this.notFound.add(url); return null; }
+        const nodes = await resp.json();
+        this.nodeCache.set(url, nodes);
+        return nodes;
+      } catch { this.notFound.add(url); return null; }
+    };
+    let url = resolvePath(this.serviceLang);
+    if (url) {
+      const result = await tryFetch(url);
+      if (result) return result;
+    }
+    if (this.serviceLang !== 'cu') {
+      const fbUrl = resolvePath('cu');
+      if (fbUrl) {
+        const result = await tryFetch(fbUrl);
+        if (result) return result;
+      }
+    }
+    const sharedUrl = resolvePath('shared');
+    if (sharedUrl) {
+      return await tryFetch(sharedUrl);
+    }
+    return null;
+  }
+}
diff --git a/src/ui/settings-view.ts b/src/ui/settings-view.ts
new file mode 100644
index 0000000..0f5e4d0
--- /dev/null
+++ b/src/ui/settings-view.ts
@@ -0,0 +1,307 @@
+/**
+ * Settings view — language, font, and display preferences.
+ */
+
+import { getTranslations, type LanguageCode } from '../core/i18n';
+
+const LANGUAGES = [
+  { code: 'en', name: 'English', local: 'English' },
+  { code: 'ru', name: 'Russian', local: 'Русский' },
+  { code: 'cu', name: 'Church Slavonic', local: 'Церковнославянский' },
+];
+
+const CU_FONTS = [
+  { id: '', name: 'System Default' },
+  { id: 'Ponomar', name: 'Ponomar' },
+  { id: 'Fedorovsk', name: 'Fedorovsk' },
+  { id: 'Menaion', name: 'Menaion' },
+  { id: 'Monomakh', name: 'Monomakh' },
+  { id: 'Triodion', name: 'Triodion' },
+  { id: 'Vilnius', name: 'Vilnius' },
+  { id: 'Voskresensky', name: 'Voskresensky' },
+];
+
+const SETTINGS_KEY = 'ponomar-settings';
+
+interface Settings {
+  language: string;
+  cuFont: string;
+  fontSize: number;
+  defaultBibleVersion: string;
+  showVerseNumbers: boolean;
+  verseNewLine: boolean;
+  calendarType: 'julian' | 'gregorian';
+  serviceRole: 'priest' | 'reader' | 'auto';
+}
+
+const DEFAULT_SETTINGS: Settings = {
+  language: 'en',
+  cuFont: 'Ponomar',
+  fontSize: 16,
+  defaultBibleVersion: 'kjv',
+  showVerseNumbers: true,
+  verseNewLine: false,
+  calendarType: 'julian',
+  serviceRole: 'priest',
+};
+
+function detectBrowserLanguage(): LanguageCode {
+  const lang = navigator.language || (navigator as any).userLanguage || '';
+  if (lang.startsWith('ru')) return 'ru';
+  if (lang.startsWith('cu')) return 'cu';
+  return 'en';
+}
+
+function loadSettings(): Settings {
+  try {
+    const stored = localStorage.getItem(SETTINGS_KEY);
+    if (stored) {
+      const parsed = JSON.parse(stored);
+      // Migrate old usePonomarFont to cuFont
+      if (parsed.usePonomarFont !== undefined) {
+        parsed.cuFont = parsed.usePonomarFont ? 'Ponomar' : '';
+        delete parsed.usePonomarFont;
+      }
+      return { ...DEFAULT_SETTINGS, ...parsed };
+    }
+  } catch { /* ignore */ }
+  return { ...DEFAULT_SETTINGS, language: detectBrowserLanguage() };
+}
+
+function saveSettings(settings: Settings) {
+  localStorage.setItem(SETTINGS_KEY, JSON.stringify(settings));
+}
+
+function fontClass(fontName: string): string {
+  if (!fontName) return 'font-system-slavonic';
+  const lower = fontName.toLowerCase();
+  const map: Record<string, string> = {
+    ponomar: 'font-ponomar',
+    fedorovsk: 'font-fedrovsk',
+    indiction: 'font-indiction',
+    menaion: 'font-menaion',
+    monomakh: 'font-monomakh',
+    triodion: 'font-triodion',
+    vilnius: 'font-vilnius',
+    voskresensky: 'font-voskresensky',
+  };
+  return map[lower] || 'font-slavonic';
+}
+
+export { loadSettings, saveSettings, fontClass };
+export type { Settings };
+
+export class SettingsView {
+  private container: HTMLElement;
+  private settings: Settings;
+  private onLanguageChange?: () => void;
+
+  constructor(container: HTMLElement, onLanguageChange?: () => void) {
+    this.container = container;
+    this.settings = loadSettings();
+    this.onLanguageChange = onLanguageChange;
+  }
+
+  render() {
+    const t = getTranslations(this.settings.language as LanguageCode);
+
+    this.container.innerHTML = `
+      <div class="p-6 max-w-2xl mx-auto">
+        <h2 class="text-2xl font-bold text-navy mb-6">${t.settings.title}</h2>
+
+        <!-- Language -->
+        <div class="mb-6">
+          <label class="block text-sm font-bold text-navy mb-2">${t.settings.language}</label>
+          <select id="language" class="w-full border border-gold/30 rounded p-2 bg-white text-navy">
+            ${LANGUAGES.map(l => `
+              <option value="${l.code}" ${l.code === this.settings.language ? 'selected' : ''}>
+                ${l.name} (${l.local})
+              </option>
+            `).join('')}
+          </select>
+        </div>
+
+        <!-- Font Settings -->
+        <div class="mb-6">
+          <h3 class="text-lg font-bold text-navy mb-3">${t.settings.fontSettings}</h3>
+
+          <div class="mb-3">
+            <select id="cu-font" class="w-full border border-gold/30 rounded p-2 bg-white text-navy">
+              ${CU_FONTS.map(f => `
+                <option value="${f.id}" ${f.id === this.settings.cuFont ? 'selected' : ''}>
+                   ${f.id === '' ? t.settings.systemFont : f.name}
+                </option>
+              `).join('')}
+            </select>
+          </div>
+
+          <div class="p-3 bg-parchment-dark rounded border border-gold/20">
+            <p class="text-sm text-navy mb-2">${t.settings.fontPreview}</p>
+            <div id="font-preview" class="text-lg">
+              Сохрани́ мѧ, гдⷭ҇и, ꙗ҆́кѡ на тѧ̀ ᲂу҆пова́хъ
+            </div>
+          </div>
+        </div>
+
+        <!-- Font Size -->
+        <div class="mb-6">
+          <label class="block text-sm font-bold text-navy mb-2">
+            ${t.settings.fontSize} <span id="font-size-value">${this.settings.fontSize}px</span>
+          </label>
+          <input type="range" id="font-size" min="12" max="32" value="${this.settings.fontSize}"
+            class="w-full accent-gold">
+        </div>
+
+        <!-- Calendar Type -->
+        <div class="mb-6">
+          <h3 class="text-lg font-bold text-navy mb-3">${t.settings.calendarType}</h3>
+          <div class="flex gap-4">
+            <label class="flex items-center gap-2 cursor-pointer">
+              <input type="radio" name="calendar-type" value="julian" ${this.settings.calendarType === 'julian' ? 'checked' : ''}
+                class="accent-gold">
+              <span class="text-sm text-navy">${t.settings.julian}</span>
+            </label>
+            <label class="flex items-center gap-2 cursor-pointer">
+              <input type="radio" name="calendar-type" value="gregorian" ${this.settings.calendarType === 'gregorian' ? 'checked' : ''}
+                class="accent-gold">
+              <span class="text-sm text-navy">${t.settings.gregorian}</span>
+            </label>
+          </div>
+        </div>
+
+        <!-- Bible Settings -->
+        <div class="mb-6">
+          <h3 class="text-lg font-bold text-navy mb-3">${t.settings.bibleSettings}</h3>
+
+          <div class="mb-3">
+            <label class="block text-sm font-bold text-navy mb-1">${t.settings.defaultTranslation}</label>
+            <select id="default-bible" class="w-full border border-gold/30 rounded p-2 bg-white text-navy">
+              <optgroup label="English">
+                <option value="kjv" ${this.settings.defaultBibleVersion === 'kjv' ? 'selected' : ''}>KJV (${t.settings.bibleComments.fullBible})</option>
+                <option value="brenton" ${this.settings.defaultBibleVersion === 'brenton' ? 'selected' : ''}>Brenton LXX (${t.settings.bibleComments.otOnly})</option>
+                <option value="nonkjv" ${this.settings.defaultBibleVersion === 'nonkjv' ? 'selected' : ''}>Modern (${t.settings.bibleComments.ntOnly})</option>
+              </optgroup>
+              <optgroup label="Русский">
+                <option value="synod" ${this.settings.defaultBibleVersion === 'synod' ? 'selected' : ''}>Синодальный (${t.settings.bibleComments.fullBible})</option>
+                <option value="kassian" ${this.settings.defaultBibleVersion === 'kassian' ? 'selected' : ''}>Еп. Кассиана (${t.settings.bibleComments.ntOnly})</option>
+                <option value="yungerov" ${this.settings.defaultBibleVersion === 'yungerov' ? 'selected' : ''}>Юнгеров (${t.settings.bibleComments.otProphets})</option>
+              </optgroup>
+              <optgroup label="Церковнославянский">
+                <option value="elis" ${this.settings.defaultBibleVersion === 'elis' ? 'selected' : ''}>Елисаветинская (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+              <optgroup label="Ἑλληνικά">
+                <option value="spt" ${this.settings.defaultBibleVersion === 'spt' ? 'selected' : ''}>Ἡ Ἁγία Γραφή (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+              <optgroup label="Français">
+                <option value="ls" ${this.settings.defaultBibleVersion === 'ls' ? 'selected' : ''}>Louis Segond (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+              <optgroup label="Latina">
+                <option value="vulgate" ${this.settings.defaultBibleVersion === 'vulgate' ? 'selected' : ''}>Vulgata (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+              <optgroup label="简体中文">
+                <option value="cuv" ${this.settings.defaultBibleVersion === 'cuv' ? 'selected' : ''}>简体圣经 (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+              <optgroup label="正體中文">
+                <option value="cuv-hant" ${this.settings.defaultBibleVersion === 'cuv-hant' ? 'selected' : ''}>正體聖經 (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+              <optgroup label="العربية">
+                <option value="svd" ${this.settings.defaultBibleVersion === 'svd' ? 'selected' : ''}>Smith - van Dyck (${t.settings.bibleComments.fullBible})</option>
+              </optgroup>
+            </select>
+          </div>
+
+          <div class="flex items-center gap-3">
+            <input type="checkbox" id="show-verses" ${this.settings.showVerseNumbers ? 'checked' : ''}
+              class="w-4 h-4 accent-gold">
+            <label for="show-verses" class="text-sm text-navy">${t.settings.showVerseNumbers}</label>
+          </div>
+
+          <div class="flex items-center gap-3">
+            <input type="checkbox" id="verse-newline" ${this.settings.verseNewLine ? 'checked' : ''}
+              class="w-4 h-4 accent-gold">
+            <label for="verse-newline" class="text-sm text-navy">${t.settings.verseNewLine}</label>
+          </div>
+        </div>
+
+        <!-- Install PWA -->
+        <div class="mb-6">
+          <button id="install-pwa" class="w-full bg-navy text-parchment rounded p-3 font-bold hover:bg-navy-light transition-colors ${!('serviceWorker' in navigator) || window.matchMedia('(display-mode: standalone)').matches ? 'hidden' : ''}">
+            ${t.settings.installPwa}
+          </button>
+        </div>
+
+        <!-- About -->
+        <div class="mt-8 pt-6 border-t border-gold/20">
+          <h3 class="text-lg font-bold text-navy mb-2">${t.settings.about}</h3>
+          <p class="text-sm text-navy-light">
+            ${t.settings.aboutText}
+          </p>
+          <p class="text-xs text-navy-light mt-2">
+            <a href="https://github.com/typiconman/ponomar" target="_blank" rel="noopener" class="underline hover:text-gold">
+              ${t.settings.aboutLicense}
+            </a>
+          </p>
+        </div>
+      </div>
+    `;
+
+    // Event listeners
+    document.getElementById('language')?.addEventListener('change', (e) => {
+      this.settings.language = (e.target as HTMLSelectElement).value;
+      saveSettings(this.settings);
+      this.onLanguageChange?.();
+    });
+
+    document.getElementById('cu-font')?.addEventListener('change', (e) => {
+      this.settings.cuFont = (e.target as HTMLSelectElement).value;
+      saveSettings(this.settings);
+      this.updateFontPreview();
+    });
+
+    document.getElementById('font-size')?.addEventListener('input', (e) => {
+      this.settings.fontSize = parseInt((e.target as HTMLInputElement).value, 10);
+      document.getElementById('font-size-value')!.textContent = `${this.settings.fontSize}px`;
+      document.documentElement.style.setProperty('--liturgical-font-size', this.settings.fontSize + 'px');
+      saveSettings(this.settings);
+    });
+
+    document.getElementById('default-bible')?.addEventListener('change', (e) => {
+      this.settings.defaultBibleVersion = (e.target as HTMLSelectElement).value;
+      saveSettings(this.settings);
+    });
+
+    document.getElementById('show-verses')?.addEventListener('change', (e) => {
+      this.settings.showVerseNumbers = (e.target as HTMLInputElement).checked;
+      saveSettings(this.settings);
+    });
+
+    document.getElementById('verse-newline')?.addEventListener('change', (e) => {
+      this.settings.verseNewLine = (e.target as HTMLInputElement).checked;
+      saveSettings(this.settings);
+    });
+
+    document.querySelectorAll('input[name="calendar-type"]').forEach(el => {
+      el.addEventListener('change', (e) => {
+        this.settings.calendarType = (e.target as HTMLInputElement).value as 'julian' | 'gregorian';
+        saveSettings(this.settings);
+      });
+    });
+    document.getElementById('install-pwa')?.addEventListener('click', async () => {
+      const prompt = (window as any).__deferredPrompt;
+      if (prompt) {
+        prompt.prompt();
+        await prompt.userChoice;
+        (window as any).__deferredPrompt = null;
+        document.getElementById('install-pwa')?.remove();
+      }
+    });
+    this.updateFontPreview();
+  }
+
+  private updateFontPreview() {
+    const preview = document.getElementById('font-preview');
+    if (preview) {
+      preview.className = `${fontClass(this.settings.cuFont)} text-lg`;
+    }
+  }
+}
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
new file mode 100644
index 0000000..11f02fe
--- /dev/null
+++ b/src/vite-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />
diff --git a/static/OrthodoxCross.svg b/static/OrthodoxCross.svg
new file mode 100644
index 0000000..087c9c9
--- /dev/null
+++ b/static/OrthodoxCross.svg
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   version="1.1"
+   id="svg1"
+   width="960"
+   height="1428"
+   viewBox="0 0 960 1428"
+   sodipodi:docname="OrthodoxCross.svg"
+   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="0.52941176"
+     inkscape:cx="479.77778"
+     inkscape:cy="714"
+     inkscape:window-width="1707"
+     inkscape:window-height="1007"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="g1" />
+  <defs
+     id="defs1" />
+  <g
+     id="g1">
+    <path
+       style="fill:#000000"
+       d="m 425.98129,1221.1944 -0.0187,-142.25 -56.42083,-47 -56.42084,-46.99996 -0.0605,-59.75 c -0.0332,-32.8625 0.16941,-59.75 0.45036,-59.75 0.28095,0 25.17153,20.6213 55.3124,45.825 30.14087,25.2038 55.336,46.1554 55.98918,46.5591 C 425.72796,958.39434 426,902.54294 426,714.00346 V 469.44444 H 237.5 48.999996 v -54 -54 H 237.5 426 v -54 -54 H 369.5 313 v -52 -52 h 56.5 56.5 v -45.5 -45.499996 h 54 54 v 45.499996 45.5 h 56.5 56.5 v 52 52 H 590.5 534 v 54 54 h 188.5 188.49996 v 54 54 H 722.5 534 v 289.92889 289.92887 l 56.5,47.2216 56.5,47.2217 v 59.9335 59.9335 l -3.75,-3.0186 c -2.0625,-1.6603 -27.375,-22.7863 -56.25,-46.9467 l -52.5,-43.9281 -0.25495,96.8627 -0.25495,96.8626 H 479.99505 426 Z"
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+</svg>
diff --git a/static/fonts/Fedorovsk-Regular.woff b/static/fonts/Fedorovsk-Regular.woff
new file mode 100644
index 0000000..28d1336
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diff --git a/static/fonts/Indiction-Regular.woff b/static/fonts/Indiction-Regular.woff
new file mode 100644
index 0000000..e2a4143
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diff --git a/static/fonts/Menaion-Regular.woff b/static/fonts/Menaion-Regular.woff
new file mode 100644
index 0000000..4365f75
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diff --git a/static/fonts/Monomakh-Regular.woff b/static/fonts/Monomakh-Regular.woff
new file mode 100644
index 0000000..c79c2da
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diff --git a/static/fonts/Ponomar-Regular.woff b/static/fonts/Ponomar-Regular.woff
new file mode 100644
index 0000000..f4f1289
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diff --git a/static/fonts/Triodion-Regular.woff b/static/fonts/Triodion-Regular.woff
new file mode 100644
index 0000000..c68b85b
Binary files /dev/null and b/static/fonts/Triodion-Regular.woff differ
diff --git a/static/fonts/Vilnius-Regular.woff b/static/fonts/Vilnius-Regular.woff
new file mode 100644
index 0000000..a411144
Binary files /dev/null and b/static/fonts/Vilnius-Regular.woff differ
diff --git a/static/fonts/Voskresensky-Regular.woff b/static/fonts/Voskresensky-Regular.woff
new file mode 100644
index 0000000..fd3547c
Binary files /dev/null and b/static/fonts/Voskresensky-Regular.woff differ
diff --git a/static/icons/icon-192.png b/static/icons/icon-192.png
new file mode 100644
index 0000000..ee84491
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diff --git a/static/icons/icon-512.png b/static/icons/icon-512.png
new file mode 100644
index 0000000..7b46ecd
Binary files /dev/null and b/static/icons/icon-512.png differ
diff --git a/static/manifest.json b/static/manifest.json
new file mode 100644
index 0000000..43c297b
--- /dev/null
+++ b/static/manifest.json
@@ -0,0 +1,22 @@
+{
+  "name": "Ponomar — Orthodox Calendar",
+  "short_name": "Ponomar",
+  "description": "Orthodox Church calendar and liturgical information",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#f5f0e8",
+  "theme_color": "#1a1a2e",
+  "orientation": "portrait",
+  "icons": [
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ]
+}
diff --git a/static/sw.js b/static/sw.js
new file mode 100644
index 0000000..ec214b9
--- /dev/null
+++ b/static/sw.js
@@ -0,0 +1,16 @@
+const CACHE = 'ponomar-v1';
+
+self.addEventListener('install', (e) => {
+  e.waitUntil(caches.open(CACHE).then(c => c.addAll(['/index.html'])));
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (e) => {
+  e.waitUntil(clients.claim());
+});
+
+self.addEventListener('fetch', (e) => {
+  e.respondWith(
+    caches.match(e.request).then(r => r || fetch(e.request))
+  );
+});
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..021c290
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "isolatedModules": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "types": []
+  },
+  "include": ["src/**/*.ts", "src/**/*.css"],
+  "exclude": ["node_modules", "dist", "scripts"]
+}
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..b43d6fc
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,16 @@
+import { defineConfig } from 'vite';
+import tailwindcss from '@tailwindcss/vite';
+import { resolve } from 'path';
+
+export default defineConfig({
+  plugins: [tailwindcss()],
+  server: {
+    port: 5173,
+    strictPort: false
+  },
+  build: {
+    outDir: 'dist',
+    sourcemap: true
+  },
+  publicDir: 'static'
+});