diff --git a/frontend/index.html b/frontend/index.html
index f8bf728..cb41589 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -18,6 +18,8 @@
     --bg: #0f172a;
     --bg-panel: #1e293b;
     --bg-input: #334155;
+    --selected-bg: #1e3a8a;   /* a blue tint, so a selected row stands out
+                                 from the GET RESPONSE pair rows */
     --border: #475569;
     --text: #e2e8f0;
     --text-muted: #94a3b8;
@@ -51,6 +53,7 @@
     --bg: #fafafa;
     --bg-panel: #e5e7eb;
     --bg-input: #ffffff;
+    --selected-bg: #dbeafe;
     --border: #d1d5db;
     --text: #1f2937;
     --text-muted: #6b7280;
@@ -147,8 +150,7 @@ body { font: 14px/1.5 system-ui, sans-serif; background: var(--bg); color: var(-
 .apdu-entry { display: flex; gap: 12px; padding: 3px 12px; border-bottom: 1px solid var(--bg-panel); cursor: pointer; align-items: baseline; }
 .apdu-entry.apdu-pair { background: var(--pair-row); }
 .apdu-entry:hover { background: var(--bg-panel); }
-.apdu-entry.selected { background: var(--bg-input); }
-[data-theme="light"] .apdu-entry.selected { background: #dbeafe; }
+.apdu-entry.selected { background: var(--selected-bg); }
 .apdu-time { color: var(--text-muted); font-family: monospace; white-space: nowrap; min-width: 80px; }
 .apdu-type { color: var(--text); font-weight: 600; min-width: 150px; }
 .apdu-type.atr { color: var(--green); }
diff --git a/frontend/sw.js b/frontend/sw.js
index fb65e99..cab5863 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v89';
+const CACHE = 'simtrace-analyser-v90';
 
 const PRECACHE = [
     'index.html',
diff --git a/frontend/tests/style.test.js b/frontend/tests/style.test.js
index 033d214..a153f1c 100644
--- a/frontend/tests/style.test.js
+++ b/frontend/tests/style.test.js
@@ -27,6 +27,16 @@ test('the P3 row labels Lc and Le', () => {
 	assert.match(src, /t\('Lc \(command data length\)'\)/);
 });
 
+test('the APDU selection is a blue tint in both themes', () => {
+	assert.match(src, /\.apdu-entry\.selected \{ background: var\(--selected-bg\); \}/);
+	assert.doesNotMatch(src, /\[data-theme="light"\] \.apdu-entry\.selected/);
+	// Dark: a blue (not the neutral --bg-input grey that blended with the
+	// GET RESPONSE pair rows); light: the established blue-100.
+	assert.match(src, /--selected-bg: #1e3a8a;/);
+	assert.match(src, /--selected-bg: #dbeafe;/);
+	assert.doesNotMatch(src, /--selected-bg: var\(--bg-input\)/);
+});
+
 // ── trace topbar layout ────────────────────────────────────────────────
 
 test('the view selector sits over the side panel at the panel width', () => {