diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4b47ad..e45e35e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
## [Unreleased]
### Changed
+- **Voice Design stylesheet split.** Voice-design form, sample-grid, and preview-match rules now live in
+ `static/css/voice-design.css`.
- **Background-job stylesheet split.** Job history and retry-panel rules now live in `static/css/background-jobs.css`.
- **Resource diagnostics stylesheet split.** Performance-panel styles now live in `static/css/resource-diagnostics.css`
and are loaded with the same release cache-busting version as the core stylesheet.
diff --git a/TODO.md b/TODO.md
index 110b81c..54d2f6d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -138,6 +138,7 @@ architecture change: the larger Audiobook/Rehearser/style split.
- [x] Extract Audiobook cast serialization and page-stamping helpers into `audiobook-cast.js`.
- [x] Split the Performance/resource diagnostic styles into `static/css/resource-diagnostics.css`.
- [x] Split background-job history and retry-panel styles into `static/css/background-jobs.css`.
+- [x] Split Voice Design form and sample-grid styles into `static/css/voice-design.css`.
- [ ] Split `style.css` by feature.
- [ ] Do not migrate to TypeScript or rewrite the frontend until behavior is covered by tests.
diff --git a/VERSION b/VERSION
index 4408ed4..68eebc0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.24.35
+1.24.36
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 6d6bf2b..577a6c9 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -38,6 +38,7 @@ Done incrementally as global-scope ordered files (no ES-module change needed)
- ✅ `audiobook-cast.js` — cast Markdown export and legacy page-stamping migration helpers; live casting remains in `audiobook.js`.
- ✅ `static/css/resource-diagnostics.css` — isolated Performance/resource diagnostic panel styles.
- ✅ `static/css/background-jobs.css` — isolated background-job history and retry-panel styles.
+- ✅ `static/css/voice-design.css` — isolated Voice Design form, samples, and preview-match styles.
- ✅ `rehearser-train.js` — transcript normalization, LCS comparison, and word-level training feedback; microphone/state wiring remains in `rehearser.js`.
- ✅ `rehearser-library.js` — SQLite persistence helpers and IndexedDB migration; import/export and auto-save remain
in `rehearser.js` until their UI/event-handler dependencies are isolated.
diff --git a/static/css/voice-design.css b/static/css/voice-design.css
new file mode 100644
index 0000000..beb4781
--- /dev/null
+++ b/static/css/voice-design.css
@@ -0,0 +1,41 @@
+/* ── Voice Design feature ─────────────────────────────────────────────────── */
+.design-hints { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 12px; color: var(--subtext); }
+.design-hints th, .design-hints td { text-align: left; vertical-align: top; padding: 7px 9px; border-bottom: 1px solid var(--border); }
+.design-hints th { color: var(--text); font-size: 14px; text-transform: uppercase; letter-spacing: .06em; }
+.design-samples-details summary { cursor: pointer; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; color: var(--subtext); user-select: none; list-style: none; }
+.design-samples-details summary::-webkit-details-marker { display: none; }
+.design-samples-details summary::before { content: '\25B6'; color: var(--accent); font-size: 14px; }
+.design-samples-details[open] summary::before { content: '\25BC'; }
+.design-samples-details summary span:first-child { font-size: 12px; font-weight: 700; color: var(--subtext); text-transform: uppercase; letter-spacing: .09em; }
+.design-samples-details .design-sample-header { margin-top: 12px; }
+.preset-row { display: flex; gap: 8px; align-items: flex-end; flex-wrap: wrap; margin-top: 10px; }
+.preset-row input, .preset-row select { background: var(--panel); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius); padding: 8px 12px; font-size: 14px; }
+.design-sample-grid { display: grid; grid-template-columns: minmax(150px,1fr) 52px 86px minmax(220px,1.4fr) minmax(220px,1.4fr) 176px; gap: 8px; align-items: center; }
+.design-sample-header { padding: 8px 10px 10px; border-bottom: 1px solid var(--border); }
+.design-sample-header div { white-space: nowrap; overflow: hidden; font-size: 14px; font-weight: 700; color: var(--subtext); text-transform: uppercase; letter-spacing: .07em; }
+.qwen-sample { border: 1px solid var(--border); border-radius: 6px; background: var(--panel); padding: 8px 10px; transition: border-color .15s; }
+.qwen-sample:hover { border-color: var(--accent); }
+.qwen-sample strong { color: var(--accent); font-size: 13px; }
+.qwen-sample .sample-sex, .qwen-sample .sample-language { color: var(--subtext); font-size: 12px; font-family: monospace; }
+.qwen-sample .sample-desc, .qwen-sample .sample-text { color: var(--subtext); font-size: 12px; line-height: 1.35; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.qwen-sample audio { display: none; grid-column: 1 / -1; margin-top: 6px; }
+.qwen-sample-actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; justify-content: flex-end; }
+.lang-select { background: var(--panel); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius); padding: 8px 12px; font-size: 14px; }
+.d-naming-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
+.d-naming-row .field { flex: 0 0 auto; }
+.d-naming-row .field.flex1 { flex: 1 1 140px; }
+#d-voice-id { font-family: monospace; font-weight: 600; font-size: 15px; color: var(--accent); width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 12px; }
+#d-transcript { min-height: 70px; width: 100%; background: var(--panel); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius); padding: 10px 14px; font-size: 14px; font-family: inherit; resize: vertical; }
+#d-lang, #d-gender, #d-name { background: var(--bg); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius); padding: 8px 12px; font-size: 14px; }
+#design-save-result { display: flex; flex-direction: column; gap: 8px; }
+#tts-voice-select { background: var(--panel); border: 1px solid var(--border); color: var(--text); border-radius: var(--radius); padding: 8px 12px; font-size: 14px; min-width: 200px; }
+.preview-match-panel { margin-top: 12px; border: 1px solid var(--border); border-radius: 6px; background: rgba(37,99,235,.04); padding: 12px; display: grid; grid-template-columns: minmax(220px,.75fr) minmax(260px,1fr); gap: 12px; }
+.preview-match-panel[hidden] { display: none; }
+.preview-match-meta { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
+.preview-match-title { font-weight: 700; color: var(--text); }
+.preview-match-detail { color: var(--subtext); font-size: 12px; line-height: 1.45; }
+.preview-match-warning { color: var(--yellow); font-size: 12px; line-height: 1.45; }
+.preview-match-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
+.preview-match-panel audio { width: 100%; min-width: 0; }
+.preview-match-transcript { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 10px; color: var(--subtext); font-family: monospace; font-size: 12px; line-height: 1.4; max-height: 88px; overflow: auto; white-space: pre-wrap; }
+@media (max-width: 900px) { .preview-match-panel { grid-template-columns: 1fr; } }
diff --git a/static/index.html b/static/index.html
index b11af2a..3aad0d1 100644
--- a/static/index.html
+++ b/static/index.html
@@ -10,7 +10,7 @@
-
+
@@ -27,9 +27,10 @@
-
-
-
+
+
+
+
@@ -394,7 +395,7 @@ window.toggleNavTree = function(treeId, chevronId) {
-
+