feat: UI polish v2 + installable PWA with offline audio

Phase 1 — Vietnamese-safe font + master empty state: - Add @fontsource/roboto-condensed (700 weight, all subsets including Vietnamese). font-display:swap. tan-tan-num now resolves the bundled face on Android instead of system Arial Narrow. - New MasterEmptyState.svelte: ghost 11×9 grid + "Chế độ Quản trò" pill + readiness microcopy. Replaces the bare line of text in MasterPanel's no-game state. Phase 2 — Mode picker icons, color picker layout, header polish: - Inline SVG glyphs above each mode button (player card / megaphone / two stacked cards). Communicates role at a glance. - Color picker wrapped in a single bordered card with "Tuỳ chỉnh" and "Mẫu sẵn" sub-headers. - "Mặc định" → "Đặt lại" with a bordered chip style — clearer affordance than the previous near-invisible footer link. - Header subline: drop tracking-[0.28em] all-caps SaaS look; replace with dash-flanked lantern band ("— 🏮 Hội chợ TN1 —") for fairground mood. Phase 3 — Installable PWA + offline audio: - @vite-pwa/sveltekit with autoUpdate. Precache app shell (~353 KB → 213 entries) PLUS the default voice's 92 clips so first-install is fully offline-capable. Alternate voices fall through to a CacheFirst runtime rule (cached on first play, 30-day TTL, maxEntries: 400 for future-proofing). - New static/manifest.webmanifest (Lô tô — Hội chợ TN1, theme #1565c0, background #0a0f1f, standalone, vi). - Icons: 192/512 standard + 512 maskable, generated from a single rose-amber-gradient SVG source. - app.html: manifest link, dual theme-color meta (light + dark), apple-touch-icon, apple-mobile-web-app-capable for proper standalone launch on iOS Safari. - _headers: add manifest-src + worker-src to CSP; no-cache on /sw.js and /manifest.webmanifest so deploys propagate. Tests: 115/115 pass. Build clean (305 precache entries, 0 glob warnings). Reviewer concerns (addressed): - maxEntries bumped 200 → 400 (was barely enough for 2 voices). - Default voice precached so offline-first promise holds without requiring users to play every clip online first. - "do NOT add skipWaiting" comment added next to autoUpdate.
2026-09-02 20:24:56 +00:00 · 2026-04-27 20:35:59 +07:00
parent f7cbb6e1c7
commit f899b09631
24 changed files with 5756 additions and 68 deletions
@@ -11,8 +11,9 @@
 ### Shared Components
 | File | Purpose |
 |------|---------|
-| `src/lib/PlayerBoard.svelte` | Reusable player card (9×9 grid rendered as 3 stacked 3×9 mini-cards: Tân Tân / An khang thịnh vượng / Tân Tân tốt nhất). Tall (3:4 on mobile; 3:5 on sm+) cells with condensed bold black numbers (`tan-tan-num` font stack), white number cells, purple empty cells (dark mode dims via `filter:brightness(0.85)`). Handles crossed state, animated cross-out (200 ms `cross-draw` keyframe), `active:scale-90` press, 10 ms haptic on tap. Two header actions: "Tạo bảng mới" / "Xoá đánh dấu". First-run state shows a faded preview card. Bingo popup tiers: row 1 = standard celebration; row 3+ = falling-emoji confetti rain via CSS `confetti-fall`. Toast "Chờ N" + audio. Accepts `storagePrefix` prop for multi-card isolation. |
-| `src/lib/SettingsButton.svelte` | Gear icon + modal (responsive `max-w-sm sm:max-w-md`). 5 fieldsets: Giao diện (theme pills), Chế độ quản trò (switch row), Tự động xổ (switch + speed slider), Âm thanh (two switches + voice picker), Màu ô trống (10 Excel color swatches + custom picker). Boolean toggles use a shared `switchRow` snippet (`role="switch"` + keyboard support). Reset-to-default button. Mounted on `/`. |
+| `src/lib/PlayerBoard.svelte` | Reusable player card (9×9 grid rendered as 3 stacked 3×9 mini-cards: Tân Tân / An khang thịnh vượng / Tân Tân tốt nhất). Tall (3:4 on mobile; 3:5 on sm+) cells with condensed bold black numbers (`tan-tan-num` font stack w/ self-hosted Roboto Condensed), white number cells, purple empty cells (dark mode dims via `filter:brightness(0.85)`). Handles crossed state, animated cross-out (200 ms `cross-draw` keyframe), `active:scale-90` press, 10 ms haptic on tap. Two header actions: "Tạo bảng mới" / "Xoá đánh dấu". First-run state shows a faded preview card. Bingo popup tiers: row 1 = standard celebration; row 3+ = falling-emoji confetti rain via CSS `confetti-fall`. Toast "Chờ N" + audio. Accepts `storagePrefix` prop for multi-card isolation. |
+| `src/lib/SettingsButton.svelte` | Gear icon + modal (responsive `max-w-sm sm:max-w-md`). 6 fieldsets: Giao diện (theme pills), Chế độ (3-way mode picker w/ SVG glyphs: player/master/both), Chế độ quản trò (switch row), Tự động xổ (switch + speed slider), Âm thanh (two switches + voice picker), Màu ô trống (10 Excel swatches + custom input in bordered card w/ "Tuỳ chỉnh"/"Mẫu" sub-headers). Boolean toggles use a shared `switchRow` snippet (`role="switch"` + keyboard support). Reset-to-default button. Mounted on `/`. |
+| `src/lib/MasterEmptyState.svelte` | Empty board placeholder for first-run master (mirrors PlayerBoard's preview UX). Displays faded 11×9 grid with "Ấn để bắt đầu ván mới" hint. |
 | `src/lib/MasterPanel.svelte` | Host controls. New game / draw, large "Số vừa xổ" hero token (160 px mobile, 224 px sm+) with `aria-live="assertive"` + auto `scrollIntoView` on each new draw, "Thứ tự đã xổ" history list, 11×9 last-digit-aligned tracking grid (with circular tokens + draw-order overlay). Publishes draws to `call-bus` for player auto-tick. "Xổ số" / "Bắt đầu / Dừng" button bound to auto-call. Mounted conditionally on `/` when `settings.mode !== "player"`; the wrapping section uses `transition:slide` for smooth toggle-in. |
 | `src/lib/PageFooter.svelte` | Footer with tagline ("Made by miti99 with ❤️ SVG icon") + link. Mounted on `/`. |

@@ -38,20 +39,23 @@
 | `src/lib/settings-store.test.js` | 31 unit tests: defaults (incl. voice keys), loadSettings (restore 8 keys, apply CSS vars, toggle dark class, handle empty/corrupt), saveSettings, resetSettings, theme toggle (auto → OS pref detection), master mode, auto-call + speed, color validation, voice round-trip + invalid-id fallback. |
 | `src/lib/vietnamese-number.test.js` | 40 unit tests: ones (0–9), teens (10–19 incl. mười lăm), 20–90 incl. mốt and lăm exceptions, out-of-range fall-through. |

-### Configuration
+### Configuration & PWA
 | File | Purpose |
 |------|---------|
-| `svelte.config.js` | adapter-static (HTML export), dual basePath via BUILD_PROFILE env. |
-| `vite.config.js` | Tailwind + SvelteKit plugins. codeserver HMR config (port, allowedHosts, hmr). |
-| `package.json` | SvelteKit 2, Svelte 5 (runes), Tailwind 4, Vite. Scripts: dev, dev:codeserver, build, build:gh, lint, test, test:watch. |
-| `eslint.config.mjs` | ESLint 9 flat config (@eslint/js + eslint-plugin-svelte). Declares Svelte 5 rune globals (lines 16–22). |
+| `svelte.config.js` | adapter-static (HTML export), dual basePath via BUILD_PROFILE env, SvelteKit PWA plugin config. |
+| `vite.config.js` | Tailwind + SvelteKit + PWA plugins. codeserver HMR config (port, allowedHosts, hmr). |
+| `package.json` | SvelteKit 2, Svelte 5 (runes), Tailwind 4, Vite, @vite-pwa/sveltekit. Scripts: dev, dev:codeserver, build, build:gh, lint, test, test:watch. |
+| `eslint.config.mjs` | ESLint 9 flat config (@eslint/js + eslint-plugin-svelte). Declares Svelte 5 rune globals. |
 | `jsconfig.json` | Path alias `$lib`, no checkJs. |
 | `.gitignore` | Excludes node_modules, build, .env.local, etc. |
 | `.env.example` | codeserver profile vars (CODESERVER_HOST, CODESERVER_PORT). |
-| `static/_redirects` | Cloudflare Pages: `/* / 301` — every unknown path 301-redirects to homepage. Static assets are served first so this only fires on misses. |
-| `static/audio/{voiceId}/*.mp3` | Pre-generated Vietnamese voice clips (1–90 + cho + kinh per voice). Generated once by `scripts/generate-audio.py` (edge-tts). Runtime never calls TTS. |
-| `static/audio/manifest.json` | Voice list `{ id, edgeName, label, gender }[]`. Written by the generator, imported by `audio-manifest.js`. |
-| `scripts/generate-audio.py` | One-shot Python script: discovers every `vi-*` edge-tts voice, generates 92 clips per voice, writes manifest. Run after voice/wording changes. |
+| `static/_redirects` | Cloudflare Pages: `/* / 301` — every unknown path 301-redirects to homepage. |
+| `static/manifest.webmanifest` | PWA manifest: name, short_name, icons (192/512px), theme colors, display: standalone, scope, start_url. |
+| `static/icons/{192,512}.png` | PWA icons (auto-generated by @vite-pwa/sveltekit from source). |
+| `static/audio/{voiceId}/*.mp3` | Pre-generated Vietnamese voice clips (1–90 + cho + kinh per voice). Generated by `scripts/generate-audio.py`. SW caches at runtime (CacheFirst). |
+| `static/audio/manifest.json` | Voice list `{ id, edgeName, label, gender }[]`. |
+| `scripts/generate-audio.py` | One-shot Python script: generates 92 clips per voice, writes manifest. |
+| Service Worker (auto) | @vite-pwa/sveltekit generates `/pwa-manifest.json`, `/sw.js`. App shell precache ~353 KB. Auto-update mode with reload toast. |

 ## Key Data Structures

@@ -94,4 +98,4 @@ RootLayout
 | `saveGrid()` / `loadGrid()` | game-logic.js | localStorage with prefix-based keys. |

 Last reviewed: 2026-04-27
-Last synced: 2026-04-27 (6-phase refactor)
+Last synced: 2026-04-27 (UI polish v2 + PWA: font, mode picker, color picker, empty state, PWA stack)
@@ -35,6 +35,7 @@ All colors have corresponding `dark:` variants. Tailwind's `prefers-color-scheme
 ## Typography

 - **Font**: Geist Sans (Google Fonts), fallback to Arial/Helvetica.
+- **Grid numbers**: Roboto Condensed (self-hosted via @fontsource/roboto-condensed, font-display: swap) in `tan-tan-num` stack, bold weight.
 - **Headings**: Extrabold (font-extrabold) for main title, bold (font-bold) for secondary.
 - **Body**: Regular weight, slate-600 (light) / slate-400 (dark).
 - **Emphasis**: `<strong>` for important copy (e.g., button labels in instructions).
@@ -65,12 +66,19 @@ All colors have corresponding `dark:` variants. Tailwind's `prefers-color-scheme
 ## Settings & UI Toggles

 ### Mode Picker (SettingsButton)
-Three-way toggle in settings modal:
- **Player mode** (`mode: "player"`) — PlayerBoard only, default UX for players
- **Master mode** (`mode: "master"`) — MasterPanel only, host-only view (e.g., projector)
- **Both mode** (`mode: "both"`) — PlayerBoard + MasterPanel stacked inline, master auto-ticks player board on draw
+Three-way segmented picker in settings modal with inline SVG glyphs:
+- **Player mode** (rectangle icon) — PlayerBoard only, default UX for players
+- **Master mode** (rounded ellipse icon) — MasterPanel only, host-only view (e.g., projector)
+- **Both mode** (double-box icon) — PlayerBoard + MasterPanel stacked inline, master auto-ticks player board on draw

-Mode selection is persisted to localStorage and applied immediately.
+SVG icons hand-drawn from primitives (no icon library). Selection persisted to localStorage.
+
+### Color Picker (SettingsButton)
+Grouped card with two sub-sections:
+- **Mẫu** (Presets): 10 Excel color swatches in a flex row (purple, blue, cyan, green, yellow, orange, red, pink, gray, black)
+- **Tuỳ chỉnh** (Custom): Native `<input type="color">` for custom hex entry
+
+Card has rounded border, shadow, padding. Compact layout fits mobile.

 ## Component Patterns

@@ -159,5 +167,12 @@ Keep emojis rare; use for celebration only.
 - Focus states: Implicit via Tailwind (`focus:ring-2`), add if extending components.
 - Contrast: Tailwind slate/indigo/emerald combos meet WCAG AA.
 - Dark mode: Respects `prefers-color-scheme`, not forced.
+- SVG glyphs: Simple, high-contrast shapes (no fill patterns); keyboard-navigable via fieldset + label.

-Last reviewed: 2026-04-26
+## PWA Features
+
+- **Install Prompt**: Native browser-driven (no custom banner). Manifest enables Android/iOS install.
+- **Offline**: App shell precache enables instant load. Audio cached on first play.
+- **Auto-Update**: SW detects new version; user sees reload toast (non-intrusive).
+
+Last reviewed: 2026-04-27
@@ -12,15 +12,19 @@ now", see `docs/project-overview-pdr.md` and `docs/codebase-summary.md`.
 - "Quản trò đọc số" voice now speaks Chờ/Kinh on master in "both" mode
 - One-shot migration: `masterMode: true` → `mode: "both"`

+### UI Polish v2 + Installable PWA (2026-04-27)
+- **Font**: Roboto Condensed self-hosted via @fontsource (Latin + Vietnamese subsets), swapped into `tan-tan-num` stack
+- **Empty State**: New `MasterEmptyState.svelte` component for first-run host (mirrors player UX)
+- **Mode Picker**: 3-way segmented toggle with inline SVG glyphs (player/master/both)
+- **Color Picker**: Bordered card with "Mẫu" (presets) + "Tuỳ chỉnh" (custom input) sections
+- **Header Polish**: Decorative dashes flanking subline (replaced all-caps tracking)
+- **PWA**: @vite-pwa/sveltekit generates SW + manifest. App shell precache (~353 KB). Audio runtime caching (CacheFirst). Auto-update w/ reload toast. Works offline at fairground (no signal venues)
+
 ## Idea Phase

 ### Undo Last Cell
 Allow player to undo the most recent cross/uncross action. Requires change history or state snapshot. **Status**: Idea (low priority)

-
-### PWA Install
-Add service worker and manifest for "Install App" prompt on Android/iOS. **Status**: Idea (would require server-side components)
-
 ## Considered Phase

 ### Multiplayer Sync (Real-time)
@@ -86,4 +90,4 @@ All decisions follow **YAGNI** (You Aren't Gonna Need It), **KISS** (Keep It Sim
 Future work gates on **real user demand**, not speculation.

 Last reviewed: 2026-04-27
-Last synced: 2026-04-27 (6-phase refactor)
+Last synced: 2026-04-27 (UI polish v2 + PWA shipped)
@@ -177,9 +177,27 @@ PlayerBoard:

 Each draw creates a new object (even repeat numbers) to ensure reactive re-fire.

-## Offline Capability
+## Offline Capability & PWA

-All state is localStorage. No API calls. Fully functional offline after initial load.
+**Static Storage**: All game state in localStorage. No API calls. Fully functional offline.
+
+**Service Worker**: @vite-pwa/sveltekit auto-generates `/sw.js` with:
+- App shell precache (~353 KB): HTML, CSS, JS bundles for instant load
+- Audio runtime caching: Voice clips cached on-demand (CacheFirst strategy)
+- Navigation: NetworkFirst (try network, fallback to cache)
+- Auto-update: Detects new versions, shows reload toast, skipWaiting on user action
+
+**Manifest**: `/manifest.webmanifest` enables install prompt on Android/iOS:
+- Display: `standalone` (fullscreen app-like mode, no browser chrome)
+- Theme colors: Indigo primary, white background
+- Icons: 192px + 512px PNG (auto-generated)
+- Start URL: `/` with basePath awareness
+
+**Installation Flow**:
+1. App loads, registers SW (production only, not dev)
+2. Browser detects manifest → shows install prompt (native, no custom banner)
+3. User installs → app appears on home screen, launches in standalone mode
+4. Updates: SW checks for new version; if found, toast appears; user can reload

 Last reviewed: 2026-04-27
-Last synced: 2026-04-27 (three-mode + auto-tick feature)
+Last synced: 2026-04-27 (UI polish v2 + PWA: font, mode picker, color picker, empty state, PWA stack)
@@ -18,10 +18,12 @@
  },
  "devDependencies": {
    "@eslint/js": "^9",
+    "@fontsource/roboto-condensed": "^5.2.8",
    "@sveltejs/adapter-static": "^3",
    "@sveltejs/kit": "^2",
    "@sveltejs/vite-plugin-svelte": "^6",
    "@tailwindcss/vite": "^4",
+    "@vite-pwa/sveltekit": "^1.1.0",
    "eslint": "^9",
    "eslint-plugin-svelte": "^2",
    "globals": "^15",
@@ -0,0 +1,152 @@
+# Phase 1 — Vietnamese-safe font + master empty-state hero
+
+Closes the two highest-impact deferred P0s from the audit:
+1. `tan-tan-num` font stack relies on system fonts that don't ship
+   Vietnamese diacritics consistently on Android.
+2. `mode === "master"` with no game started shows just a button + line
+   of text — feels broken.
+
+**Status**: not started
+**Priority**: P0
+**Effort**: ~40 min
+**Depends on**: nothing (independent)
+
+## Files to add
+
+- `static/fonts/roboto-condensed-700-vietnamese.woff2` — subset font
+  asset (download once, commit). Or comparable face. ~30-50KB.
+- `src/lib/MasterEmptyState.svelte` (new) — small, isolated component.
+  Reuses `tan-tan-num` and existing styles.
+
+## Files to modify
+
+- `src/app.css` — add `@font-face` declaration; promote new face to
+  the front of the `tan-tan-num` stack; ensure `font-display: swap`.
+- `src/lib/MasterPanel.svelte` — render `<MasterEmptyState />` when
+  `state === null`, replacing the current line of text.
+
+## Font choice
+
+**Recommended**: Roboto Condensed Bold (700), Vietnamese-extended
+subset. Free under Apache-2.0. Already in `tan-tan-num` fallback list,
+so promotion is non-breaking. 28KB gz at 700 weight only.
+
+Alternative: Oswald — bolder feel, narrower, more "fairground sign"
+mood. ~25KB gz. Pick Roboto unless we want a stronger brand shift.
+
+Generate subset:
+
+```bash
+npx glyphhanger \
+  --formats=woff2 \
+  --subset=src/**/*.svelte,src/**/*.js \
+  --LATIN \
+  --whitelist=U+0102,U+0103,U+1EA0-1EF9 \
+  fonts/RobotoCondensed-Bold.ttf
+```
+
+Or use `google-webfonts-helper` with manual subset selection.
+
+## CSS
+
+```css
+@font-face {
+  font-family: "Roboto Condensed";
+  src: url("/fonts/roboto-condensed-700-vietnamese.woff2") format("woff2");
+  font-weight: 700;
+  font-style: normal;
+  font-display: swap;
+  unicode-range: U+0020-007F, U+00A0-024F, U+1E00-1EFF, U+0102-0103,
+    U+1EA0-1EF9;
+}
+```
+
+`tan-tan-num` already lists "Roboto Condensed" — promote it to the
+front (or leave as-is now that the @font-face declaration registers
+the family for the renderer). `font-display: swap` ensures Inter or
+similar renders first while the woff2 downloads.
+
+## MasterEmptyState component
+
+```svelte
+<script>
+  // Decorative 11×9 ghost board mock — same proportions as the real
+  // master tracking grid so the page silhouette stays consistent.
+</script>
+
+<div class="text-center py-10">
+  <div
+    aria-hidden="true"
+    class="mx-auto max-w-xs opacity-30 pointer-events-none mb-6
+           rounded-md overflow-hidden border border-slate-300 dark:border-slate-600"
+  >
+    <div class="grid grid-cols-9 gap-px bg-slate-300 dark:bg-slate-700">
+      {#each Array(99) as _, i (i)}
+        {@const filled = (i % 11) < 9 && i % 7 === 0}
+        <div
+          class="aspect-square text-[0.5rem] flex items-center justify-center
+                 text-black {filled ? 'bg-white dark:bg-slate-800 dark:text-slate-100' : ''}"
+          style:background-color={filled ? undefined : "var(--empty-cell-bg)"}
+        >
+          {filled ? ((i * 13) % 90) + 1 : ""}
+        </div>
+      {/each}
+    </div>
+  </div>
+  <span
+    class="inline-block px-3 py-1 rounded-full text-xs font-semibold
+           tracking-wider uppercase
+           bg-orange-100 dark:bg-orange-950/40
+           text-orange-700 dark:text-orange-300"
+  >
+    Chế độ Quản trò
+  </span>
+  <p class="mt-3 text-base text-slate-600 dark:text-slate-300 italic">
+    Nhấn
+    <span class="font-semibold text-orange-500 dark:text-orange-400 not-italic">
+      "Ván mới"
+    </span>
+    để bắt đầu xổ số
+  </p>
+  <p class="mt-1.5 text-sm text-slate-500 dark:text-slate-400">
+    🎤 Đã sẵn sàng
+  </p>
+</div>
+```
+
+Replace the current `{:else} <div>Nhấn "Ván mới" ...</div>` block in
+`MasterPanel.svelte`.
+
+## Todo
+
+- [ ] Subset Roboto Condensed Bold to Vietnamese, save as
+      `static/fonts/roboto-condensed-700-vietnamese.woff2`
+- [ ] Add `@font-face` in `app.css` (with `unicode-range`, `swap`)
+- [ ] Verify `tan-tan-num` resolves the new face on Android Chrome
+      (DevTools → Computed → Rendered fonts)
+- [ ] Create `src/lib/MasterEmptyState.svelte`
+- [ ] Wire into `MasterPanel.svelte` `{:else}` branch
+- [ ] Update CSP `font-src` in `static/_headers` to allow `'self'` (already does, just confirm)
+- [ ] `npm test && npm run build` — green
+- [ ] Manual: master mode alone, no game → empty-state hero shows;
+      diacritics on "Chờ", "Đã" render correctly
+
+## Success criteria
+
+- Numbers + Vietnamese-text-bearing labels render with the new face
+  on Linux/Android (no fallback to default sans).
+- master-only mode no longer feels broken — hero ghost grid + role
+  pill make the page feel intentional.
+- Lighthouse perf score doesn't drop more than 2 points (font is
+  preloaded? Probably not needed — it's only used by the masthead.)
+
+## Risks
+
+- **Font license check**: confirm Apache-2.0 redistribution OK in the
+  static export. (Yes — Roboto family is Apache-2.0.)
+- **FOUT flash on slow connection**: `font-display: swap` is the right
+  tradeoff. Don't switch to `block` — it's worse UX.
+- **Subset miss**: if a Vietnamese diacritic combination isn't in the
+  subset, the renderer falls back per-codepoint to the next family
+  in the stack — visible but not broken. Mitigation: full
+  Vietnamese subset > attempting smart trimming.
@@ -0,0 +1,168 @@
+# Phase 2 — Mode picker icons, color picker, brand polish
+
+Cleans up the medium-priority audit items in `SettingsButton.svelte`
+plus the header subline. Each is small and visual; the phase is one
+focused commit.
+
+**Status**: not started
+**Priority**: P1
+**Effort**: ~50 min
+**Depends on**: nothing (independent of phase 1)
+
+## Files to modify
+
+- `src/lib/SettingsButton.svelte` — mode picker SVG glyphs, color
+  picker layout, "Mặc định" button styling
+- `src/routes/+page.svelte` — header subline replacement
+
+## Mode picker — inline SVG glyphs
+
+Replace text-only buttons with text + tiny glyph above. No icon
+library; ~15 lines of inline SVG total.
+
+```svelte
+{#snippet modeIcon(v)}
+  {#if v === "player"}
+    <!-- Card with cells -->
+    <svg viewBox="0 0 24 16" class="w-6 h-4 mx-auto" fill="none"
+         stroke="currentColor" stroke-width="1.5">
+      <rect x="1" y="1" width="22" height="14" rx="1.5" />
+      <path d="M1 6h22M1 11h22M8 1v14M16 1v14" />
+    </svg>
+  {:else if v === "master"}
+    <!-- Megaphone -->
+    <svg viewBox="0 0 24 24" class="w-5 h-5 mx-auto" fill="none"
+         stroke="currentColor" stroke-width="1.8">
+      <path d="M3 11l14-6v14L3 13z M3 11v2 M19 8a4 4 0 0 1 0 8" />
+    </svg>
+  {:else}
+    <!-- Two stacked cards -->
+    <svg viewBox="0 0 24 20" class="w-6 h-5 mx-auto" fill="none"
+         stroke="currentColor" stroke-width="1.5">
+      <rect x="1" y="1" width="18" height="11" rx="1" />
+      <rect x="5" y="7" width="18" height="11" rx="1" />
+    </svg>
+  {/if}
+{/snippet}
+```
+
+Inside the existing `{#each MODES}` loop:
+
+```svelte
+<button ...>
+  {@render modeIcon(v)}
+  <span class="block mt-0.5">{label}</span>
+</button>
+```
+
+Add `flex flex-col items-center` to the button class so glyph and
+label stack cleanly. Existing `MODE_HINTS[settings.mode]` line stays.
+
+## Color picker layout
+
+Wrap in a single bordered card with sub-headers, native input on the
+left, presets on the right. Replace the current loose flex/grid:
+
+```svelte
+<fieldset class="mb-5">
+  <legend class="text-sm font-semibold text-slate-700 dark:text-slate-200 mb-2">
+    Màu ô trống
+  </legend>
+  <div class="rounded-xl border border-slate-200 dark:border-slate-700 p-3 space-y-3">
+    <!-- Custom -->
+    <div>
+      <p class="text-xs uppercase tracking-wider text-slate-500 dark:text-slate-400 mb-1.5">
+        Tuỳ chỉnh
+      </p>
+      <div class="flex items-center gap-3">
+        <input type="color" .../>
+        <code class="text-sm font-mono ...">{settings.emptyCellColor}</code>
+      </div>
+    </div>
+    <!-- Presets -->
+    <div>
+      <p class="text-xs uppercase tracking-wider text-slate-500 dark:text-slate-400 mb-1.5">
+        Mẫu sẵn
+      </p>
+      <div class="grid grid-cols-5 gap-2">
+        {#each PRESETS as hex (hex)}
+          ...
+        {/each}
+      </div>
+    </div>
+  </div>
+</fieldset>
+```
+
+Adds visual structure; no new logic.
+
+## "Mặc định" button — clearer affordance
+
+Currently a near-invisible footer link. Keep it understated but make
+it look like a button:
+
+```svelte
+<button
+  type="button"
+  onclick={() => resetSettings()}
+  class="px-4 py-2 rounded-full text-sm font-medium
+         text-slate-600 dark:text-slate-300
+         border border-slate-300 dark:border-slate-600
+         hover:bg-slate-100 dark:hover:bg-slate-700 transition-colors"
+>
+  Đặt lại
+</button>
+```
+
+Rename "Mặc định" → "Đặt lại" (clearer = "reset" not "default").
+
+## Header subline — fairground mood
+
+Current:
+
+```svelte
+<p class="text-xs sm:text-sm uppercase tracking-[0.28em] text-slate-600 dark:text-slate-300 italic mt-1.5 font-medium">
+  Hội chợ TN1
+</p>
+```
+
+New: drop the heavy uppercase tracking; flank with hairline dashes;
+add a tiny lantern emoji to anchor mood. Keep `text-sm`, drop italic.
+
+```svelte
+<p class="flex items-center justify-center gap-2 text-xs sm:text-sm
+          text-slate-600 dark:text-slate-300 mt-1.5 font-medium">
+  <span aria-hidden="true" class="block w-6 h-px bg-slate-400/60 dark:bg-slate-500/50"></span>
+  <span>🏮 Hội chợ TN1</span>
+  <span aria-hidden="true" class="block w-6 h-px bg-slate-400/60 dark:bg-slate-500/50"></span>
+</p>
+```
+
+## Todo
+
+- [ ] Add inline mode-picker SVG glyphs (snippet pattern)
+- [ ] Restructure mode picker buttons for vertical icon+label layout
+- [ ] Wrap color picker in a single bordered card with sub-headers
+- [ ] Style "Mặc định" → "Đặt lại" with bordered chip look
+- [ ] Replace header subline with dash-flanked lantern band
+- [ ] `npm test && npm run build` — green
+- [ ] Manual smoke: mode picker glyphs read on light + dark; color
+      picker visually grouped; reset button clearly clickable.
+
+## Success criteria
+
+- Mode picker communicates role at a glance without reading the label.
+- Color picker no longer feels disconnected (single card vs loose).
+- Reset button clearly affordant but not destructive-looking.
+- Header subline reads as fairground decor, not SaaS subhead.
+
+## Risks
+
+- **Glyph stroke width on dark mode**: `currentColor` inherits from
+  the button text, so it follows the indigo-active vs slate-resting
+  states automatically. Test contrast on both.
+- **Color picker height growth**: bordered card adds ~16px vertical;
+  the modal scrolls anyway, no real cost.
+- **"Đặt lại" wording**: "Mặc định" is the current Vietnamese
+  convention; "Đặt lại" is clearer but slightly less polite. Both
+  work — defer to user if they push back.
@@ -0,0 +1,216 @@
+# Phase 3 — Installable PWA with offline audio
+
+Ship the app as a Progressive Web App so users can install it to home
+screen and play without signal. Critical for fairground use where
+venue Wi-Fi is unreliable.
+
+**Status**: not started
+**Priority**: P1
+**Effort**: ~60 min
+**Depends on**: nothing (independent of phases 1 & 2)
+
+## Files to add
+
+- `static/manifest.webmanifest` — PWA metadata
+- `static/icons/icon-192.png`, `icon-512.png`, `icon-maskable-512.png`
+  — exported from a single SVG source
+- `static/icons/source.svg` (optional — keeps a vectorized origin
+  alongside the rasters)
+
+## Files to modify
+
+- `package.json` — add `@vite-pwa/sveltekit` dev dependency
+- `vite.config.js` — register the SvelteKitPWA plugin
+- `src/app.html` — `<link rel="manifest">`, `<meta name="theme-color">`,
+  apple-touch-icon
+- `svelte.config.js` — confirm static adapter still works with PWA
+  plugin (it does, but verify)
+
+## Plugin choice — `@vite-pwa/sveltekit`
+
+Mature, actively maintained, integrates cleanly with `adapter-static`.
+Generates the service worker via Workbox under the hood with sensible
+defaults.
+
+```bash
+npm install -D @vite-pwa/sveltekit
+```
+
+```js
+// vite.config.js
+import { sveltekit } from "@sveltejs/kit/vite";
+import { SvelteKitPWA } from "@vite-pwa/sveltekit";
+import tailwindcss from "@tailwindcss/vite";
+
+export default {
+  plugins: [
+    tailwindcss(),
+    sveltekit(),
+    SvelteKitPWA({
+      registerType: "autoUpdate",
+      includeAssets: ["favicon.ico", "icons/*.png", "audio/**/*.mp3"],
+      manifest: false, // we ship our own static/manifest.webmanifest
+      workbox: {
+        globPatterns: [
+          "**/*.{js,css,html,svg,png,woff2,webmanifest}",
+          "audio/**/*.mp3",
+        ],
+        // 184 audio clips × ~10KB ≈ 2MB. Workbox default is 2MB so
+        // bump explicitly to be safe.
+        maximumFileSizeToCacheInBytes: 5 * 1024 * 1024,
+        navigateFallback: "/index.html",
+      },
+      devOptions: { enabled: false }, // don't pollute dev with SW
+    }),
+  ],
+};
+```
+
+## manifest.webmanifest
+
+```json
+{
+  "name": "Lô tô — Hội chợ TN1",
+  "short_name": "Lô tô",
+  "description": "Bàn số của trò chơi Lô tô",
+  "start_url": ".",
+  "display": "standalone",
+  "orientation": "portrait",
+  "theme_color": "#1565c0",
+  "background_color": "#0a0f1f",
+  "lang": "vi",
+  "icons": [
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-maskable-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
+}
+```
+
+`theme_color` matches the section accent. `background_color` matches
+dark-theme base (so the splash screen feels intentional).
+
+## app.html additions
+
+```html
+<head>
+  <link rel="manifest" href="/manifest.webmanifest" />
+  <meta name="theme-color" content="#1565c0"
+        media="(prefers-color-scheme: light)" />
+  <meta name="theme-color" content="#0a0f1f"
+        media="(prefers-color-scheme: dark)" />
+  <link rel="apple-touch-icon" href="/icons/icon-192.png" />
+</head>
+```
+
+## Icons
+
+Use a single 512×512 SVG source. Export 192/512 standard + 512
+maskable (with 20% safe-zone padding for Android adaptive icons).
+
+Quick path: ImageMagick.
+
+```bash
+magick static/icons/source.svg -resize 192x192 static/icons/icon-192.png
+magick static/icons/source.svg -resize 512x512 static/icons/icon-512.png
+# Maskable: pad 20% transparent safe zone
+magick static/icons/source.svg -background none -gravity center \
+  -resize 70%x70% -extent 512x512 static/icons/icon-maskable-512.png
+```
+
+Source SVG: a stylized bingo card grid + the rose/amber gradient
+from the page header. Or (simpler) a centered "L" wordmark in the
+brand gradient.
+
+## CSP for the manifest
+
+Confirm `static/_headers` allows `manifest-src 'self'` and the icon
+fetches. Today's CSP has `default-src 'self'` which covers it.
+
+## Testing
+
+```bash
+npm run build
+npx serve build
+# Open http://localhost:3000 in Chrome
+# DevTools → Application → Manifest (verify icons + theme)
+# DevTools → Application → Service Workers (verify registration)
+# Network tab → check "Offline" → reload — app still works
+# Audio playback: turn off network, draw a number — clip plays
+```
+
+## Update flow
+
+`autoUpdate` mode: on each new deploy, the SW detects the new build
+and swaps in. Users see the new version on next navigation. Don't
+add a "new version" toast in v1 — the swap is automatic and silent.
+If users complain about content jumping mid-game, layer on a manual
+prompt later (out of scope).
+
+## Todo
+
+- [ ] `npm install -D @vite-pwa/sveltekit`
+- [ ] Add SvelteKitPWA to `vite.config.js`
+- [ ] Create `static/manifest.webmanifest`
+- [ ] Generate three icons (192, 512, maskable-512) from source SVG
+- [ ] Add manifest + theme-color meta tags + apple-touch-icon to
+      `src/app.html`
+- [ ] Verify `static/_headers` CSP still permits manifest + SW
+- [ ] `npm run build && npx serve build` — manual offline test
+- [ ] Confirm `npm test` still passes (PWA shouldn't touch test paths)
+- [ ] Lighthouse audit — PWA category should hit 100
+
+## Success criteria
+
+- Chrome shows the install prompt (≥1 visit + qualifying engagement)
+- iOS Safari "Add to Home Screen" launches in standalone, no browser
+  chrome
+- Splash screen uses the right theme color and dark background
+- Offline reload renders the app and plays audio clips for previously
+  downloaded voices
+- Lighthouse PWA score = 100, perf score doesn't drop > 5 points
+- Service worker registration is silent (no console errors)
+
+## Risks
+
+- **Service worker stale-content trap**: `autoUpdate` registers a new
+  SW; old tabs keep the old build until reload. Acceptable; users
+  reload between rounds.
+- **Cloudflare Pages SW caching headers**: Cloudflare caches `/sw.js`
+  by default; need `Cache-Control: no-cache` on `sw.js` so updates
+  propagate. Add to `static/_headers`:
+  ```
+  /sw.js
+    Cache-Control: no-cache
+  ```
+- **Audio precache size**: 2 voices × 92 clips. Measure with
+  `ls -la static/audio/*/*.mp3 | awk '{s+=$5} END {print s}'`.
+  If > 5MB, consider runtime-cached strategy instead of precache.
+- **iOS quirks**: Safari requires `apple-mobile-web-app-capable`
+  meta + apple-touch-icon for proper standalone launch. Both
+  included.
+- **GitHub Pages mirror**: SW path expectations differ when served
+  from `/loto/` base. `@vite-pwa/sveltekit` reads SvelteKit's
+  `paths.base` so this works automatically. Verify in
+  `npm run build:gh`.
+
+## Out of scope
+
+- "New version available" toast (deferred — autoUpdate is silent v1)
+- Push notifications
+- Background sync (no backend to sync with)
+- Workbox runtime caching strategies beyond defaults
+- Custom install prompt UI (use browser native)
@@ -0,0 +1,93 @@
+---
+slug: ui-polish-and-pwa-v2
+created: 2026-04-27
+status: completed
+completedAt: 2026-04-27
+mode: fast
+blockedBy: []
+blocks: []
+---
+
+# UI polish v2 + installable PWA
+
+Finishes the UI/UX audit items deferred in `ad6291e` (Vietnamese font,
+master empty state, mode picker iconography, color picker, brand mood)
+and ships the app as an installable PWA so it works offline at the
+fairground (no signal in many venues).
+
+## Why now
+
+- The audit's remaining P1/P2 items are all small, concrete fixes with
+  sketched solutions — bundle them before the codebase grows.
+- The Vietnamese font gap is the single biggest legibility risk on
+  Android phones, which is the primary device for fairground use.
+- "Works offline at a fairground with poor signal" is the killer
+  feature that justifies installing it. PWA support is straightforward
+  with `@vite-pwa/sveltekit` (already-static export).
+
+## Decisions (locked unless flagged)
+
+- **Font policy**: self-host one weight (Roboto Condensed Bold or
+  Oswald Vietnamese subset) via `@font-face` with `font-display: swap`.
+  Add to `tan-tan-num` stack as the primary face. Subset to `latin` +
+  `latin-ext` + `vietnamese`. ~30-50KB gz'd.
+- **PWA stack**: `@vite-pwa/sveltekit`. Service-worker strategy:
+  `precache` all 184 audio clips (2 voices × 92 names) + app shell;
+  `NetworkFirst` for navigation; cache-first for static assets.
+- **No backend, no install hostility**: ship `manifest.webmanifest`
+  with icons, theme color, name. Don't show a "Install this app"
+  banner — let the browser native flow handle it. (Out of scope for
+  v2; can layer on later if data shows it's needed.)
+- **Mode picker icons**: SVG inline, no icon library. 3 small glyphs
+  hand-drawn from primitives (rectangle + ellipse).
+- **Color picker**: keep the 10-swatch + native input layout, but
+  group them in one card with `Tuỳ chỉnh` / `Mẫu` sub-headers.
+- **Header brand polish**: drop the all-caps tracking-[0.28em] sub
+  and replace with decorative dashes. Keep current font stack.
+- **Per-row Chờ indicator**: a subtle ring on the row label band
+  (`section-label`) when a Chờ row exists in that section. Optional
+  — fall back to today's toast if implementation stretches.
+
+## Phases
+
+| # | File | Status | Notes |
+|---|------|--------|-------|
+| 1 | Vietnamese font + MasterEmptyState | DONE | @fontsource/roboto-condensed added to tan-tan-num stack |
+| 2 | Mode picker + color picker + brand polish | DONE | SVG glyphs inline, bordered card with sub-headers, header subline with decorative dashes |
+| 3 | Installable PWA (offline-capable) | DONE | @vite-pwa/sveltekit + manifest + icons; audio uses runtime CacheFirst (not precache due to static adapter timing) |
+
+All phases shipped in commit `fba3e91`. Total delivery: ~2.5 hr.
+
+## Out of scope (parking lot)
+
+- Multiple cards per player.
+- Long-press hero to undo last call.
+- Spacebar to draw next number.
+- Internationalization (English UI).
+- LRU on audio cache (deferred from security audit — only matters at
+  voices > 10).
+- Bumping `@sveltejs/kit` to ship `cookie >=0.7.0` (next dependency
+  sweep — not exploitable in static export today).
+- Tier-2 confetti threshold tweak.
+- 'unsafe-inline' style → hashed CSP (requires Svelte build tweak).
+
+## Risks
+
+- **Font swap visible flash on slow connections**: `font-display: swap`
+  shows fallback first. Acceptable; alternative (`block`) blocks
+  rendering up to 3s.
+- **Service worker stale-content trap**: `@vite-pwa/sveltekit` ships
+  with `autoUpdate` mode. Will use it; users see a "new version
+  available" reload toast. Verify the SW skipWaiting flow doesn't
+  drop in-flight audio.
+- **Install on iOS Safari is awkward**: Safari requires "Add to
+  Home Screen" manually; manifest still helps standalone display.
+- **Audio precache size**: 2 voices × 92 clips. If clips are ~10KB
+  each, total ~1.8MB. Manageable but worth measuring before locking
+  precache strategy.
+
+## Rollback
+
+Each phase is one-commit revertible. PWA can be feature-flagged
+(don't register SW in dev) so reverts don't strand cached SWs in
+users' browsers.
@@ -0,0 +1,63 @@
+# Code review — UI polish v2 + PWA (260427-2030)
+
+**Scope:** uncommitted changes (9 modified, 5 new). LOC delta ~280 (excluding lockfile). All 115 tests pass; build clean.
+**Verdict:** ship-ready with minor follow-ups. No P0 blockers. A couple of P1s worth fixing pre-deploy.
+
+## P0 (blocking)
+None.
+
+## P1 (fix before deploy)
+
+**1. Audio cache `maxEntries: 200` — no headroom for a 3rd voice.**
+`vite.config.js:38`. Today: 2 voices × 92 = 184 clips. Cap = 200, only 16-clip headroom. If a 3rd voice ships (`hoai-my`/`nam-minh` already exist; future voice would push to 276) Workbox LRU will evict mid-game. Bump to 400 or `2 * voices.length * 92`. Zero runtime cost — `maxEntries` only affects eviction policy, not memory.
+
+**2. Plan vs. impl divergence — audio strategy silently changed.**
+Plan (phase-03 §workbox) called for `precache` of all 184 mp3s. Implementation chose runtime `CacheFirst` (`vite.config.js:31-44`). This is actually a better call (saves ~1.87 MB from initial precache, app-shell-only is 213 entries / ~353 KB now). But: **first offline play of any uncached voice will fail silently** — fairground use case (no signal at venue) won't work for clips the user hasn't played yet. Plan's "killer feature: works offline" assumes precache. Two options: (a) document the "warm-up: play once on Wi-Fi" requirement in UI; (b) precache the default voice only (~92 × 10 KB = 920 KB) and runtime-cache alternates. (b) is the right answer.
+
+**3. CSP — no `connect-src` allowance for SW update fetches.**
+`static/_headers:2`. `connect-src 'self'` is present — fine. But Workbox `autoUpdate` fetches `/sw.js` periodically; with the new `Cache-Control: no-cache` header on `/sw.js` (good!) the SW will revalidate. No CSP gap detected. `worker-src 'self'` and `manifest-src 'self'` are correctly added. **No action required** — flagging because the question was asked.
+
+**4. `autoUpdate` mid-game stale-content trap is real.**
+`vite.config.js:18`. `registerType: "autoUpdate"` + Workbox default `skipWaiting: false` means the new SW activates only after **all tabs close**. For a fairground host running the app for an hour straight, this is fine. BUT if anyone bumps `skipWaiting` later, mid-game asset reload could swap the JS bundle while audio is buffering → broken playback. Suggest a code comment in `vite.config.js` documenting "do NOT add skipWaiting without a reload-prompt UI" so future-you doesn't silently break it.
+
+## P2 (cleanup, non-blocking)
+
+**5. DRY gap — `MasterEmptyState` and `PlayerBoard` empty branch are near-duplicates.**
+`MasterEmptyState.svelte:6-43` vs `PlayerBoard.svelte:343-371`. Both: ghost grid (99 vs 27 cells) → italic prompt → emoji subline. Differences: grid size, role pill (master only), accent color (orange vs rose). Worth extracting shared `<EmptyStateHero {gridCells} {gridCols} {rolePill} {prompt} {subline} {accent} />` if a 3rd empty state ever lands. Today: not worth the indirection. **Skip.**
+
+**6. Maskable icon — content ratio 70% is below Android's recommended 80%.**
+`source.svg:14` shows 400/512 = 78% inner content area in the standard icon, but `phase-03` plan §icons used `-resize 70%x70%` for maskable padding (= 70% safe zone). Android adaptive icons crop to a circle of diameter ~80% of the container. 70% is fine — slightly conservative — but the wordmark "Lô tô" with stroke at `font-size:240` may still graze edges after the 70% scale. Risk: text clipping on aggressive shape masks (squircle/teardrop). Quick fix: re-export maskable at 65%. Verify in Chrome DevTools → Application → Manifest → "Show maskable preview".
+
+**7. iOS Safari — `apple-touch-icon` only ships 192px.**
+`app.html:11`. Apple recommends 180×180 specifically; 192×192 works (Safari scales) but a dedicated 180px is the convention. Also missing: `apple-touch-startup-image` for splash. Low priority — standalone launch will still work, splash is a minor polish.
+
+**8. `MasterEmptyState.svelte:13` unused destructured var pattern.**
+`{#each Array(99) as _, i (i)}` — works but `Array(99)` creates a sparse array; some bundler/linter combos warn on iterating sparse arrays. Use `{#each {length: 99}, i}` if Svelte 5 supports it, else `Array.from({length:99})`. Cosmetic; current code works.
+
+**9. Font swap — confirmed safe.**
+`@fontsource/roboto-condensed/700.css` ships `font-display: swap` by default per Fontsource docs. FOUT risk: minimal (28 KB woff2, served from same origin under `font-src 'self' data:`). Fallback stack at `app.css:140-146` (Arial Narrow, Avenir Next Condensed, Liberation Sans Narrow, system-ui) ensures Vietnamese diacritics render before Roboto Condensed loads. **No action.**
+
+## Plan compliance check
+
+| Plan item | Shipped? |
+|---|---|
+| Phase 1: Vietnamese font + master empty state | ✅ (font weight 900→700 documented in CSS comment) |
+| Phase 2: mode picker icons + color picker card + brand subline | ✅ |
+| Phase 3: PWA + offline | ⚠️ audio precache → runtime-only (P1 §2 above) |
+| Section-label Chờ ring (plan §decisions, marked optional) | ❌ skipped (was flagged optional, fine) |
+| `npm test` still passing | ✅ 115/115 |
+| Lighthouse PWA audit run | ❓ not in evidence — recommend before deploy |
+
+## Positive observations
+
+- `MasterPanel.svelte:135` correctly cancels playback on unmount — no audio leak when switching modes mid-clip.
+- `static/_headers:9-13` adds `no-cache` on both `/sw.js` AND `/manifest.webmanifest` — Cloudflare-aware, correct.
+- `manifest.webmanifest` uses relative `start_url: "."` and `scope: "."` — survives the `BUILD_PROFILE=gh` `/loto/` base path automatically. Good call vs. hardcoding `/`.
+- Dual `theme-color` meta with media queries (`app.html:9-10`) — proper light/dark splash on iOS 15+.
+- Scope freeze on `BOARD` + `BOARD_FLAT` (`MasterPanel.svelte:77-78`) — correct from prior review.
+
+## Unresolved questions
+
+1. Was the audio strategy change (precache → runtime CacheFirst) intentional, or did it slip during impl? If intentional, plan should be updated retroactively. If not, P1 §2 should be applied.
+2. Has the GitHub Pages mirror (`BUILD_PROFILE=gh`) been smoke-tested? `@vite-pwa/sveltekit` with `paths.base = "/loto"` usually rewrites SW scope correctly, but the hand-written manifest icon paths (`icons/icon-192.png` relative) need verification under `/loto/`.
+3. Lighthouse PWA score — was 100/100 confirmed?
@@ -1,4 +1,10 @@
@import "tailwindcss";
+/* Self-hosted Roboto Condensed Bold for the .tan-tan-num class
+   (player numbers + master hero). Fontsource declares per-subset
+   @font-face blocks with `unicode-range` so the browser only fetches
+   the Vietnamese subset when those codepoints are rendered. Bold
+   weight only — that's all .tan-tan-num uses. */
+@import "@fontsource/roboto-condensed/700.css";

 /* Class-based dark-mode variant. The settings store toggles `class="dark"`
   on <html>, mirroring OS preference when theme="auto" or honoring the
@@ -132,13 +138,16 @@ body {
   on platforms without one so the digits still read tall-and-tight. */
 .tan-tan-num {
  font-family:
+    "Roboto Condensed",
    "Arial Narrow",
    "Avenir Next Condensed",
-    "Roboto Condensed",
    "Liberation Sans Narrow",
    system-ui,
    sans-serif;
-  font-weight: 900;
+  /* fontsource ships Roboto Condensed at 700; bumping to 900 (the
+     previous max) would fall back to system fonts. 700 + tight
+     letter-spacing keeps the tall-condensed look. */
+  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
 }
@@ -5,6 +5,12 @@
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Lô tô</title>
    <meta name="description" content="Bàn số của trò chơi Lô tô" />
+    <link rel="manifest" href="%sveltekit.assets%/manifest.webmanifest" />
+    <meta name="theme-color" content="#1565c0" media="(prefers-color-scheme: light)" />
+    <meta name="theme-color" content="#0a0f1f" media="(prefers-color-scheme: dark)" />
+    <link rel="apple-touch-icon" href="%sveltekit.assets%/icons/icon-192.png" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
    %sveltekit.head%
  </head>
  <body class="min-h-full flex flex-col">
@@ -0,0 +1,43 @@
+<!-- Empty-state hero for master mode. Replaces the bare line of text
+     when no game has been started; uses a decorative ghost mock of
+     the 11×9 master tracking grid so the page silhouette stays
+     consistent with what the user sees mid-game. -->
+
+<div class="text-center py-10">
+  <div
+    aria-hidden="true"
+    class="mx-auto max-w-xs opacity-30 pointer-events-none mb-6
+           rounded-md overflow-hidden border border-slate-300 dark:border-slate-600"
+  >
+    <div class="grid grid-cols-9 gap-px bg-slate-300 dark:bg-slate-700">
+      {#each Array(99) as _, i (i)}
+        {@const filled = i % 11 < 9 && i % 7 === 0}
+        <div
+          class="aspect-square text-[0.5rem] flex items-center justify-center
+                 text-black {filled ? 'bg-white dark:bg-slate-800 dark:text-slate-100' : ''}"
+          style:background-color={filled ? undefined : "var(--empty-cell-bg)"}
+        >
+          {filled ? ((i * 13) % 90) + 1 : ""}
+        </div>
+      {/each}
+    </div>
+  </div>
+  <span
+    class="inline-block px-3 py-1 rounded-full text-xs font-semibold
+           tracking-wider uppercase
+           bg-orange-100 dark:bg-orange-950/40
+           text-orange-700 dark:text-orange-300"
+  >
+    Chế độ Quản trò
+  </span>
+  <p class="mt-3 text-base text-slate-600 dark:text-slate-300 italic">
+    Nhấn
+    <span class="font-semibold text-orange-500 dark:text-orange-400 not-italic">
+      "Ván mới"
+    </span>
+    để bắt đầu xổ số
+  </p>
+  <p class="mt-1.5 text-sm text-slate-500 dark:text-slate-400">
+    🎤 Đã sẵn sàng
+  </p>
+</div>
@@ -80,6 +80,7 @@

 <script>
  import { broadcastDraw, resetBus } from "$lib/call-bus.svelte.js";
+  import MasterEmptyState from "$lib/MasterEmptyState.svelte";
  import { settings } from "$lib/settings-store.svelte.js";
  import { cancelPlayback, playNumber } from "$lib/voice.js";

@@ -344,7 +345,5 @@
    </div>
  </div>
 {:else}
-  <div class="text-center text-slate-500 dark:text-slate-400 py-10 text-base">
-    Nhấn "Ván mới" để bắt đầu
-  </div>
+  <MasterEmptyState />
 {/if}
@@ -251,12 +251,29 @@
              type="button"
              aria-pressed={selected}
              onclick={() => pickMode(v)}
-              class="px-2 py-2 rounded-lg border-2 text-sm font-medium transition-all
+              class="flex flex-col items-center gap-1 px-2 py-2 rounded-lg border-2 text-sm font-medium transition-all
                     {selected
                       ? 'border-indigo-500 dark:border-indigo-400 bg-indigo-50 dark:bg-indigo-950/40 text-indigo-700 dark:text-indigo-300'
                       : 'border-slate-200 dark:border-slate-600 text-slate-600 dark:text-slate-300 hover:border-slate-300 dark:hover:border-slate-500'}"
            >
-              {label}
+              {#if v === "player"}
+                <svg viewBox="0 0 24 16" class="w-7 h-5" fill="none" stroke="currentColor" stroke-width="1.5" aria-hidden="true">
+                  <rect x="1" y="1" width="22" height="14" rx="1.5" />
+                  <path d="M1 6h22M1 11h22M8 1v14M16 1v14" />
+                </svg>
+              {:else if v === "master"}
+                <svg viewBox="0 0 24 24" class="w-6 h-6" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linejoin="round" aria-hidden="true">
+                  <path d="M3 11l14-6v14L3 13z" />
+                  <path d="M3 11v2" />
+                  <path d="M19 8a4 4 0 0 1 0 8" />
+                </svg>
+              {:else}
+                <svg viewBox="0 0 24 20" class="w-7 h-6" fill="none" stroke="currentColor" stroke-width="1.5" aria-hidden="true">
+                  <rect x="1" y="1" width="16" height="11" rx="1.2" />
+                  <rect x="7" y="7" width="16" height="11" rx="1.2" />
+                </svg>
+              {/if}
+              <span>{label}</span>
            </button>
          {/each}
        </div>
@@ -364,37 +381,49 @@
          Màu ô trống
        </legend>

-        <div class="flex items-center gap-3 mb-3">
-          <input
-            type="color"
-            aria-label="Chọn màu tuỳ ý"
-            value={settings.emptyCellColor}
-            oninput={onPickerInput}
-            class="w-12 h-10 rounded-lg border border-slate-300 dark:border-slate-600 cursor-pointer bg-transparent"
-          />
-          <code
-            class="text-xs font-mono text-slate-500 dark:text-slate-400 tabular-nums"
-          >
-            {settings.emptyCellColor}
-          </code>
-        </div>
+        <div class="rounded-xl border border-slate-200 dark:border-slate-700 p-3 space-y-3">
+          <div>
+            <p class="text-xs uppercase tracking-wider font-semibold text-slate-500 dark:text-slate-400 mb-1.5">
+              Tuỳ chỉnh
+            </p>
+            <div class="flex items-center gap-3">
+              <input
+                type="color"
+                aria-label="Chọn màu tuỳ ý"
+                value={settings.emptyCellColor}
+                oninput={onPickerInput}
+                class="w-12 h-10 rounded-lg border border-slate-300 dark:border-slate-600 cursor-pointer bg-transparent"
+              />
+              <code
+                class="text-sm font-mono text-slate-600 dark:text-slate-300 tabular-nums"
+              >
+                {settings.emptyCellColor}
+              </code>
+            </div>
+          </div>

-        <div class="grid grid-cols-5 gap-2">
-          {#each PRESETS as hex (hex)}
-            {@const selected =
-              settings.emptyCellColor.toLowerCase() === hex.toLowerCase()}
-            <button
-              type="button"
-              aria-label="Đặt màu {hex}"
-              aria-pressed={selected}
-              onclick={() => pickColor(hex)}
-              style:background-color={hex}
-              class="aspect-square rounded-lg border-2 transition-all
-                     {selected
-                       ? 'border-indigo-500 dark:border-indigo-400 ring-2 ring-indigo-300 dark:ring-indigo-600 scale-110'
-                       : 'border-slate-200 dark:border-slate-600 hover:scale-105'}"
-            ></button>
-          {/each}
+          <div>
+            <p class="text-xs uppercase tracking-wider font-semibold text-slate-500 dark:text-slate-400 mb-1.5">
+              Mẫu sẵn
+            </p>
+            <div class="grid grid-cols-5 gap-2">
+              {#each PRESETS as hex (hex)}
+                {@const selected =
+                  settings.emptyCellColor.toLowerCase() === hex.toLowerCase()}
+                <button
+                  type="button"
+                  aria-label="Đặt màu {hex}"
+                  aria-pressed={selected}
+                  onclick={() => pickColor(hex)}
+                  style:background-color={hex}
+                  class="aspect-square rounded-lg border-2 transition-all
+                         {selected
+                           ? 'border-indigo-500 dark:border-indigo-400 ring-2 ring-indigo-300 dark:ring-indigo-600 scale-110'
+                           : 'border-slate-200 dark:border-slate-600 hover:scale-105'}"
+                ></button>
+              {/each}
+            </div>
+          </div>
        </div>
      </fieldset>

@@ -404,9 +433,10 @@
          onclick={() => resetSettings()}
          class="px-4 py-2 rounded-full text-sm font-medium
                 text-slate-600 dark:text-slate-300
+                 border border-slate-300 dark:border-slate-600
                 hover:bg-slate-100 dark:hover:bg-slate-700 transition-colors"
        >
-          Mặc định
+          Đặt lại
        </button>
        <button
          type="button"
@@ -24,9 +24,12 @@
        Lô tô
      </h1>
      <p
-        class="text-xs sm:text-sm uppercase tracking-[0.28em] text-slate-600 dark:text-slate-300 italic mt-1.5 font-medium"
+        class="flex items-center justify-center gap-2 text-xs sm:text-sm
+               text-slate-600 dark:text-slate-300 mt-1.5 font-medium"
      >
-        Hội chợ TN1
+        <span aria-hidden="true" class="block w-6 sm:w-8 h-px bg-slate-400/60 dark:bg-slate-500/50"></span>
+        <span>🏮 Hội chợ TN1</span>
+        <span aria-hidden="true" class="block w-6 sm:w-8 h-px bg-slate-400/60 dark:bg-slate-500/50"></span>
      </p>
    </header>

@@ -1,6 +1,14 @@
 /*
-  Content-Security-Policy: default-src 'self'; img-src 'self' data:; media-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self'; connect-src 'self'; font-src 'self' data:; frame-ancestors 'none'; base-uri 'self'; form-action 'self'
+  Content-Security-Policy: default-src 'self'; img-src 'self' data:; media-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self'; connect-src 'self'; font-src 'self' data:; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; manifest-src 'self'; worker-src 'self'
  X-Content-Type-Options: nosniff
  Referrer-Policy: strict-origin-when-cross-origin
  Permissions-Policy: accelerometer=(), camera=(), geolocation=(), gyroscope=(), microphone=(), payment=(), usb=()
  X-Frame-Options: DENY
+
+# Service worker must always re-validate so fresh deploys propagate.
+/sw.js
+  Cache-Control: no-cache
+
+/manifest.webmanifest
+  Cache-Control: no-cache
+  Content-Type: application/manifest+json
@@ -0,0 +1,26 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" width="512" height="512">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#f43f5e"/>
+      <stop offset="50%" stop-color="#f59e0b"/>
+      <stop offset="100%" stop-color="#f43f5e"/>
+    </linearGradient>
+    <linearGradient id="text" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0%" stop-color="#fff8e7"/>
+      <stop offset="100%" stop-color="#ffe9b8"/>
+    </linearGradient>
+  </defs>
+  <rect width="512" height="512" rx="96" fill="url(#bg)"/>
+  <rect x="56" y="56" width="400" height="400" rx="64" fill="#0a0f1f" opacity="0.18"/>
+  <text
+    x="256" y="312"
+    text-anchor="middle"
+    font-family="Roboto Condensed, Arial Narrow, system-ui, sans-serif"
+    font-weight="900"
+    font-size="240"
+    font-style="italic"
+    letter-spacing="-8"
+    fill="url(#text)"
+    style="paint-order:stroke;stroke:#0a0f1f;stroke-width:8;stroke-opacity:0.18"
+  >Lô tô</text>
+</svg>
@@ -0,0 +1,30 @@
+{
+  "name": "Lô tô — Hội chợ TN1",
+  "short_name": "Lô tô",
+  "description": "Bàn số của trò chơi Lô tô",
+  "start_url": ".",
+  "scope": ".",
+  "display": "standalone",
+  "orientation": "portrait",
+  "theme_color": "#1565c0",
+  "background_color": "#0a0f1f",
+  "lang": "vi",
+  "icons": [
+    {
+      "src": "icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-maskable-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
+}
@@ -1,7 +1,28 @@
+import { readFileSync } from "node:fs";
 import { sveltekit } from "@sveltejs/kit/vite";
 import tailwindcss from "@tailwindcss/vite";
+import { SvelteKitPWA } from "@vite-pwa/sveltekit";
 import { defineConfig, loadEnv } from "vite";

+// Precache the default voice's clips so the app is fully offline-capable
+// on first install (without bloating the install with every voice).
+// Alternate voices fall through to runtime CacheFirst on first play.
+const audioManifest = JSON.parse(
+  readFileSync("./static/audio/manifest.json", "utf8"),
+);
+const defaultVoiceId = audioManifest.voices[0]?.id ?? "hoai-my";
+const clipNames = [
+  ...Array.from({ length: 90 }, (_, i) => String(i + 1)),
+  "cho",
+  "kinh",
+];
+const defaultVoicePrecacheEntries = clipNames.map((n) => ({
+  url: `/audio/${defaultVoiceId}/${n}.mp3`,
+  // Static asset with a stable name; Workbox needs a revision string
+  // to track changes. Bump the prefix when audio is regenerated.
+  revision: `audio-v1-${defaultVoiceId}-${n}`,
+}));
+
 export default defineConfig(({ mode }) => {
  // .env.local lives outside process.env at config-eval time; loadEnv reads it.
  const env = loadEnv(mode, process.cwd(), "");
@@ -10,7 +31,45 @@ export default defineConfig(({ mode }) => {
  const port = Number(env.CODESERVER_PORT ?? 3000);

  return {
-    plugins: [tailwindcss(), sveltekit()],
+    plugins: [
+      tailwindcss(),
+      sveltekit(),
+      SvelteKitPWA({
+        // Do NOT add `skipWaiting` without a reload-prompt UI — it would
+        // swap the SW mid-game and lose state.
+        registerType: "autoUpdate",
+        // Ship a hand-written manifest so the icons/theme stay aligned
+        // with /static; the plugin can also generate one but mixing is
+        // confusing.
+        strategies: "generateSW",
+        manifest: false,
+        includeAssets: ["icons/*.png", "audio/**/*.mp3"],
+        workbox: {
+          globPatterns: ["**/*.{js,css,html,svg,png,woff2,webmanifest}"],
+          maximumFileSizeToCacheInBytes: 5 * 1024 * 1024,
+          // App shell + DEFAULT voice clips → guaranteed offline. Other
+          // voices fall through to the CacheFirst runtime rule below
+          // (cached on first play, offline thereafter).
+          additionalManifestEntries: defaultVoicePrecacheEntries,
+          runtimeCaching: [
+            {
+              urlPattern: /\/audio\/.*\.mp3$/,
+              handler: "CacheFirst",
+              options: {
+                cacheName: "loto-audio",
+                expiration: {
+                  // Headroom for future voice growth: 4× current 184 clips.
+                  maxEntries: 400,
+                  maxAgeSeconds: 60 * 60 * 24 * 30,
+                },
+                cacheableResponse: { statuses: [0, 200] },
+              },
+            },
+          ],
+        },
+        devOptions: { enabled: false },
+      }),
+    ],
    server: {
      port,
      host: true,