chore: v0.5.2 — bump version + CHANGELOG entry

Hotfix for v0.5.1's BAGeL/PopTron slug mistake. Same deferred-from-
Web-Store pattern as v0.5.1 — bundle ships only after v0.5.0 clears.

CHANGELOG.md

@@ -7,12 +7,151 @@ Format: [Keep a Changelog 1.1.0](https://keepachangelog.com/en/1.1.0/) — versi
 
 ## [Unreleased]
 
-### Planned — Tier 2 polish (next)
+### Planned — Future polish
-- Light mode support (`prefers-color-scheme` + flipped palette across popup / NewTab / Options)
 - `.m3u` parser alongside `.pls` to widen future-adapter compatibility
 - Station artwork lazy-load + fallback to family helmet
 - Better error UI for failed streams ("Stream unavailable, try another")
 - `.crx` packaging instructions in README for sideload users
+- Second source adapter stub to exercise the multi-source UI
+
+---
+
+## [0.5.2] — 2026-06-10 — Quick Stations fix: replace retired BAGeL with PopTron
+
+Hotfix for v0.5.1's Quick Stations row. David flagged: *"the stations still look a bit off"* — turned out only 13 chips were rendering instead of the intended 14. Investigation showed **BAGeL Radio has been retired from SomaFM's current `channels.json` catalogue** — the render loop's "drop missing slugs silently" behaviour (working as designed) made the chip just disappear.
+
+### Changed
+
+- `src/newtab/newtab.js` `QUICK_IDS` array: `'bagel'` → `'poptron'`. PopTron (alternative / alt-rock) fills the same indie/alt-rock genre slot BAGeL covered, and is currently a live SomaFM channel.
+
+### Result
+
+14 chips visible again. Layout reads cleaner — 6+6+2 instead of 6+6+1 (ThistleRadio no longer alone on its own row).
+
+### No other change
+
+- No CSS, no permissions, no dependencies, no behaviour change
+- Single one-line edit in `QUICK_IDS`
+- Still held from Chrome Web Store upload until v0.5.0 clears re-review
+
+### Lesson — SomaFM channel catalogue is mutable
+
+Channels can be retired at any time. The render loop's "drop missing slugs silently" pattern protects against this, but the developer-side responsibility is to verify slugs against the live `channels.json` before adding to QUICK_IDS:
+
+```bash
+curl -s https://somafm.com/channels.json | python3 -c "import json,sys; print([c['id'] for c in json.load(sys.stdin)['channels']])"
+```
+
+---
+
+## [0.5.1] — 2026-06-10 — Quick Stations expansion (8 → 14)
+
+Third update of the day. **Tagged on Gitea but held from Chrome Web Store upload until v0.5.0 clears re-review** — we want the v0.5.0 features (light mode + theme toggle + back-link + first-run UX hint) landing in users' browsers before this stations expansion piles on top.
+
+### Added — 6 more channels in the NewTab Quick Stations chip row
+
+Was reading sparse with only 8 chips. The row had space for more. Added six channels for broader genre coverage + two on-brand picks:
+
+| Slug | Channel | Why |
+|---|---|---|
+| `defcon` | DEF CON Radio | Electronic / hacker culture — David's personal favourite, on-brand for a cybersecurity-adjacent extension |
+| `beatblender` | Beat Blender | Electronic / breakbeat — popular channel |
+| `bootliquor` | Boot Liquor | Americana / outlaw country — adds country/twang coverage |
+| `u80s` | Underground 80s | 80s indie / synthwave — adds decade coverage |
+| `bagel` | BAGeL Radio | Indie / alt-rock — guitar-driven indie |
+| `thistle` | ThistleRadio | Celtic / folk — 🇮🇪 Dublin-built nod |
+
+Total chip count: 8 → 14. No new files, no new permissions, no new dependencies, no code change other than the `QUICK_IDS` array in `src/newtab/newtab.js`.
+
+The render loop already drops any slug missing from SomaFM's `channels.json` catalogue, so if a channel is retired upstream the chip just disappears silently — no error, no broken state.
+
+### Files touched
+
+- `src/newtab/newtab.js` — `QUICK_IDS` array updated from 8 to 14 entries, with per-slug genre comments. +19 / -8 lines.
+
+Total: 1 file, +19/-8 lines.
+
+### Not changed
+
+- No new permissions
+- No new dependencies
+- No CSS / HTML changes
+- No data migration
+
+### Shipping note
+
+`v0.5.1` is tagged on Gitea on 2026-06-10 but **deliberately held from the Chrome Web Store** until `v0.5.0` clears re-review (currently pending). David's reasoning: *"we will ship to web store after the last one gets accepted, that one is important so a user knows what to do"* — the v0.5.0 first-run hint + light mode features are higher-value for new users; this stations expansion is a smaller polish that should land after.
+
+---
+
+## [0.5.0] — 2026-06-10 — Light mode + theme toggle + Options back-link
+
+Second post-launch update, ~36 hours after v0.4.0 cleared the Chrome Web Store. Three bundled improvements, all UX polish:
+
+### Added — Light mode support across all three surfaces
+
+**Phase 1 — Auto-follow OS theme.** Each stylesheet (popup, NewTab, Options) gets a `@media (prefers-color-scheme: light)` block that flips the `:root` CSS variables to a light palette while preserving brand identity. Every existing rule using `var(--*)` tokens carries over unchanged.
+
+Light palette:
+- `--bg` `#f6f4ed` cream-leaning off-white
+- `--bg-soft` `#ece5d2` slightly darker for header bars
+- `--bg-row` `#ddd6c0` hover backgrounds
+- `--bg-row-hi` `#c8c0a8` active rows
+- `--fg` `#2a2f28` dark forest-green-leaning text
+- `--accent` `#2a7d3e` darker brand green (preserves "RangerHQ green" identity)
+- `--cream` `#b8861a` darker amber (readable on light)
+- `--danger` `#b53a2b` darker red (readable on light)
+
+NewTab helmet watermark opacity bumped 0.025 → 0.04 in light mode (helmet contrasts differently on light bg). Wired via a new `--watermark-opacity` CSS variable.
+
+State pills, primary play button, toasts, and danger button hover all get text-colour overrides for both modes so they stay readable when their background becomes solid accent / cream / danger.
+
+### Added — Manual Auto / Dark / Light theme toggle (Phase 2)
+
+**Three-radio group in a new "Appearance" card on the Options page.** Stored in `chrome.storage.local` under `tuner.theme`. Defaults to "auto" (follow OS).
+
+- **Auto** — follows OS via `@media (prefers-color-scheme: light)` (covers ~95% of users)
+- **Dark** — forces dark palette regardless of OS
+- **Light** — forces light palette regardless of OS
+
+This exists because there are three independent theme layers (OS, browser-chrome, page CSS) that can disagree. `@media (prefers-color-scheme: ...)` reads the OS layer only, NOT the browser-chrome theme. So users with mismatched layers (e.g. macOS light + Chrome dark theme installed) can override the auto-follow.
+
+Implementation: `data-theme` attribute on `<html>` ( "light" / "dark" / removed for auto). `html[data-theme="..."]` CSS selectors beat both the default `:root` and the `@media :root` on specificity.
+
+New file: `src/lib/theme.js` — shared `getTheme/setTheme/applyTheme/initTheme` helpers used by all three entry-point scripts.
+
+The choice syncs across surfaces via `chrome.storage.onChanged`: pick Light in Options → popup + NewTab flip instantly without reload. Theme applies BEFORE first paint (each init() calls `initTheme()` first) so there's no dark flash on light-mode-preferring browsers.
+
+### Added — Options page → Tuner back-link
+
+The Options page header (helmet + "RangerHQ Tuner — Options") is now a single clickable anchor pointing at `newtab.html`. Subtle `←` glyph to the left of the helmet; hover shifts the arrow left and tints it accent green. Same-tab navigation — user came IN via Options, goes OUT into the player UI in the same tab. No accumulating Tuner tabs.
+
+Fixes UX gap David flagged on 2026-06-09 night: *"when i click the settings button i go to settings but we have no back link to radio."*
+
+### Files touched
+
+- `src/lib/theme.js` (NEW, ~55 lines)
+- `src/popup/popup.css` (+50 lines — light + dark override blocks)
+- `src/popup/popup.js` (+8 lines — initTheme call + storage.onChanged hook)
+- `src/newtab/newtab.css` (+50 lines — light + dark override blocks)
+- `src/newtab/newtab.js` (+8 lines — same wiring)
+- `src/options/options.html` (+24 lines — Appearance card)
+- `src/options/options.css` (+90 lines — light + dark blocks + radio styling)
+- `src/options/options.js` (+32 lines — radio handlers + cross-surface sync)
+
+Total: 8 files, ~340 lines added.
+
+### Not changed
+
+- No new permissions
+- No new host_permissions
+- No new external libraries
+- No data migration required
+- Existing user state (current station / volume / history / favourites) survives intact
+
+### Reviewer expectations
+
+Same-account update with no permission change. Same-day review expected (~hours to 24h), similar to v0.4.0's 24h-ish re-review window per [[reference_chrome_web_store_rules]].
 
 ---
 

manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "RangerHQ Tuner",
-  "version": "0.4.0",
+  "version": "0.5.2",
   "description": "Lightweight SomaFM radio player. Logs what plays. One-click search to Spotify, YouTube, Apple Music, Bandcamp. No telemetry.",
   "author": "David Keane",
   "homepage_url": "https://davidtkeane.com/rangerhq-tuner",

src/lib/theme.js

@@ -0,0 +1,55 @@
+// RangerHQ Tuner — Theme helpers (v0.5.0)
+//
+// Three modes:
+//   auto   — follow OS via @media (prefers-color-scheme: light)
+//   dark   — force dark regardless of OS
+//   light  — force light regardless of OS
+//
+// Stored in chrome.storage.local under `tuner.theme`. Default: auto.
+//
+// Application strategy: set/remove `data-theme` attribute on <html>.
+//   - "auto" → attribute removed → @media in each stylesheet decides
+//   - "dark" → data-theme="dark" → CSS forces dark vars
+//   - "light" → data-theme="light" → CSS forces light vars
+//
+// Used from popup.js, newtab.js, and options.js on init + on cross-surface
+// sync.
+
+export const THEME_KEY = 'tuner.theme';
+export const THEME_AUTO  = 'auto';
+export const THEME_DARK  = 'dark';
+export const THEME_LIGHT = 'light';
+export const THEME_DEFAULT = THEME_AUTO;
+export const VALID_THEMES = [THEME_AUTO, THEME_DARK, THEME_LIGHT];
+
+/** Read the stored theme preference, falling back to "auto". */
+export async function getTheme() {
+  if (typeof chrome === 'undefined' || !chrome.storage?.local) return THEME_DEFAULT;
+  const o = await chrome.storage.local.get(THEME_KEY);
+  const v = o[THEME_KEY];
+  return VALID_THEMES.includes(v) ? v : THEME_DEFAULT;
+}
+
+/** Persist a theme preference. Any cross-surface listeners will pick it up. */
+export async function setTheme(theme) {
+  if (!VALID_THEMES.includes(theme)) theme = THEME_DEFAULT;
+  if (typeof chrome === 'undefined' || !chrome.storage?.local) return theme;
+  await chrome.storage.local.set({ [THEME_KEY]: theme });
+  return theme;
+}
+
+/** Apply a theme to the current document. Pass "auto" to clear the override. */
+export function applyTheme(theme) {
+  const t = VALID_THEMES.includes(theme) ? theme : THEME_DEFAULT;
+  const html = document.documentElement;
+  if (t === THEME_AUTO) {
+    html.removeAttribute('data-theme');
+  } else {
+    html.setAttribute('data-theme', t);
+  }
+}
+
+/** Convenience: read the stored theme and apply it. */
+export async function initTheme() {
+  applyTheme(await getTheme());
+}

src/newtab/newtab.css

@@ -17,8 +17,58 @@
   --danger:     #c9685b;
   --radius:     8px;
   --maxw:       760px;
+  --watermark-opacity: 0.025;
 }
 
+/* ──────────────────────────────────────────────────────────────────────
+   Light mode (v0.5.0) — auto-follows OS theme. Same approach as popup:
+   override :root vars so every existing rule using var(--*) keeps
+   working unchanged. Watermark opacity bumped slightly since the
+   helmet contrasts more against light bg.
+   ────────────────────────────────────────────────────────────────────── */
+/* OS-follow light mode */
+@media (prefers-color-scheme: light) {
+  :root {
+    --bg:         #f6f4ed;
+    --bg-soft:    #ece5d2;
+    --bg-row:     #ddd6c0;
+    --bg-row-hi:  #c8c0a8;
+    --fg:         #2a2f28;
+    --fg-muted:   #6a7064;
+    --accent:     #2a7d3e;
+    --accent-dim: #6dbf7a;
+    --cream:      #b8861a;
+    --danger:     #b53a2b;
+    --watermark-opacity: 0.04;
+  }
+  .nt-state-pill[data-state="playing"]   { color: #fff; }
+  .nt-state-pill[data-state="buffering"] { color: #fff; }
+  .nt-state-pill[data-state="error"]     { color: #fff; }
+  .nt-btn--primary[aria-pressed="true"]  { color: #fff; }
+}
+
+/* Manual override — force LIGHT */
+html[data-theme="light"] {
+  --bg: #f6f4ed; --bg-soft: #ece5d2; --bg-row: #ddd6c0; --bg-row-hi: #c8c0a8;
+  --fg: #2a2f28; --fg-muted: #6a7064; --accent: #2a7d3e; --accent-dim: #6dbf7a;
+  --cream: #b8861a; --danger: #b53a2b; --watermark-opacity: 0.04;
+}
+html[data-theme="light"] .nt-state-pill[data-state="playing"]   { color: #fff; }
+html[data-theme="light"] .nt-state-pill[data-state="buffering"] { color: #fff; }
+html[data-theme="light"] .nt-state-pill[data-state="error"]     { color: #fff; }
+html[data-theme="light"] .nt-btn--primary[aria-pressed="true"]  { color: #fff; }
+
+/* Manual override — force DARK */
+html[data-theme="dark"] {
+  --bg: #0f1411; --bg-soft: #1a221c; --bg-row: #1f2823; --bg-row-hi: #2a3530;
+  --fg: #e8e4d4; --fg-muted: #97a094; --accent: #6dbf7a; --accent-dim: #2a7d3e;
+  --cream: #f4e9b7; --danger: #c9685b; --watermark-opacity: 0.025;
+}
+html[data-theme="dark"] .nt-state-pill[data-state="playing"]   { color: var(--bg); }
+html[data-theme="dark"] .nt-state-pill[data-state="buffering"] { color: var(--bg); }
+html[data-theme="dark"] .nt-state-pill[data-state="error"]     { color: var(--cream); }
+html[data-theme="dark"] .nt-btn--primary[aria-pressed="true"]  { color: var(--bg); }
+
 * { box-sizing: border-box; }
 
 html, body {
@@ -40,7 +90,7 @@ body::before {
   background-repeat: no-repeat;
   background-position: center;
   background-size: min(60vh, 600px);
-  opacity: 0.025;
+  opacity: var(--watermark-opacity);
   pointer-events: none;
   z-index: 0;
 }

src/newtab/newtab.js

@@ -13,6 +13,7 @@ import {
   searchUrls, formatRelativeTime,
   entrySignature,
 } from '../lib/history.js';
+import { THEME_KEY, THEME_DEFAULT, initTheme, applyTheme } from '../lib/theme.js';
 
 const els = {
   // Clock
@@ -56,15 +57,26 @@ const CATALOGUE_TTL_MS = 6 * 60 * 60 * 1000;
 
 // Quick-pick stations. These are the SomaFM ids most people start with.
 // If the catalogue is missing any (rare), they're just dropped silently.
+//
+// Layout: 14 stations across roughly chill / ambient / indie / lounge /
+// space / electronic / americana / 80s / alt-rock / celtic — broader
+// genre coverage than the v0.4.0 list, plus DEF CON Radio (the on-brand
+// cybersecurity pick) and ThistleRadio (the Dublin-built Irish nod).
 const QUICK_IDS = [
-  'groovesalad',
+  'groovesalad',     // chill / electronic
-  'dronezone',
+  'dronezone',       // ambient
-  'indiepop',
+  'indiepop',        // indie pop rocks
-  'secretagent',
+  'secretagent',     // lounge / spy
-  'spacestation',
+  'spacestation',    // ambient / space
-  'lush',
+  'lush',            // vocal / chill
-  'deepspaceone',
+  'deepspaceone',    // ambient
-  'fluid',
+  'fluid',           // electronic
+  'defcon',          // electronic / hacker culture (DEF CON Radio)
+  'beatblender',     // electronic / breakbeat
+  'bootliquor',      // americana / outlaw country
+  'u80s',            // 80s indie / synthwave (Underground 80s)
+  'poptron',         // alternative / alt-rock (PopTron) — replaces BAGeL Radio (retired by SomaFM)
+  'thistle',         // celtic / folk (ThistleRadio)
 ];
 
 let stations = [];
@@ -80,7 +92,11 @@ init().catch(err => {
 });
 
 async function init() {
-  // Clock first — visible even before stations load.
+  // Theme first — apply stored preference before anything paints to avoid
+  // a brief dark flash if the user has picked light.
+  await initTheme();
+
+  // Clock — visible even before stations load.
   tickClock();
   clockTimer = setInterval(tickClock, 1000); // 1 Hz — live seconds
 
@@ -181,6 +197,10 @@ async function init() {
   chrome.storage.onChanged.addListener(async (changes, area) => {
     if (area !== 'local') return;
 
+    if (changes[THEME_KEY]) {
+      applyTheme(changes[THEME_KEY].newValue || THEME_DEFAULT);
+    }
+
     if (changes[STORAGE_KEYS.currentId] && stations.length) {
       const newId = changes[STORAGE_KEYS.currentId].newValue;
       currentStation = stations.find(s => s.id === newId) || null;

src/options/options.css

@@ -16,6 +16,91 @@
   --radius:     6px;
 }
 
+/* ──────────────────────────────────────────────────────────────────────
+   Light mode (v0.5.0) — auto-follows OS theme. Same approach as popup
+   + newtab: flip the :root vars only. Existing rules using var(--*)
+   carry over unchanged. Toast text + danger-button hover adjusted for
+   light-bg readability.
+   ────────────────────────────────────────────────────────────────────── */
+/* OS-follow light mode */
+@media (prefers-color-scheme: light) {
+  :root {
+    --bg:         #f6f4ed;
+    --bg-soft:    #ece5d2;
+    --bg-row:     #ddd6c0;
+    --bg-row-hi:  #c8c0a8;
+    --fg:         #2a2f28;
+    --fg-muted:   #6a7064;
+    --accent:     #2a7d3e;
+    --accent-dim: #6dbf7a;
+    --cream:      #b8861a;
+    --danger:     #b53a2b;
+  }
+  .opt-toast                    { color: #fff; }
+  .opt-toast[data-tone="error"] { color: #fff; }
+  .opt-btn--danger:hover        { color: #fff; }
+}
+
+/* Manual override — force LIGHT */
+html[data-theme="light"] {
+  --bg: #f6f4ed; --bg-soft: #ece5d2; --bg-row: #ddd6c0; --bg-row-hi: #c8c0a8;
+  --fg: #2a2f28; --fg-muted: #6a7064; --accent: #2a7d3e; --accent-dim: #6dbf7a;
+  --cream: #b8861a; --danger: #b53a2b;
+}
+html[data-theme="light"] .opt-toast                    { color: #fff; }
+html[data-theme="light"] .opt-toast[data-tone="error"] { color: #fff; }
+html[data-theme="light"] .opt-btn--danger:hover        { color: #fff; }
+
+/* Manual override — force DARK */
+html[data-theme="dark"] {
+  --bg: #0f1411; --bg-soft: #1a221c; --bg-row: #1f2823; --bg-row-hi: #2a3530;
+  --fg: #e8e4d4; --fg-muted: #97a094; --accent: #6dbf7a; --accent-dim: #2a7d3e;
+  --cream: #f4e9b7; --danger: #c9685b;
+}
+html[data-theme="dark"] .opt-toast                    { color: var(--bg); }
+html[data-theme="dark"] .opt-toast[data-tone="error"] { color: var(--cream); }
+html[data-theme="dark"] .opt-btn--danger:hover        { color: var(--cream); }
+
+/* Theme toggle UI (v0.5.0 Phase 2) */
+.opt-theme-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-top: 8px;
+}
+
+.opt-theme-row label {
+  flex: 1;
+  min-width: 90px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 6px;
+  font-size: 12px;
+  font-weight: 500;
+  margin: 0;
+  padding: 8px 12px;
+  border: 1px solid var(--bg-row-hi);
+  border-radius: var(--radius);
+  background: var(--bg-row);
+  cursor: pointer;
+  transition: border-color 120ms ease-out;
+}
+
+.opt-theme-row label:hover {
+  border-color: var(--accent);
+}
+
+.opt-theme-row input[type="radio"] {
+  margin: 0;
+  accent-color: var(--accent);
+}
+
+.opt-theme-row label:has(input:checked) {
+  border-color: var(--accent);
+  background: var(--bg-row-hi);
+}
+
 * { box-sizing: border-box; }
 
 html, body {
@@ -40,7 +125,29 @@ html, body {
 .opt-brand {
   display: flex;
   align-items: center;
-  gap: 12px;
+  gap: 10px;
+  text-decoration: none;
+  color: inherit;
+  padding: 4px 8px;
+  margin: -4px -8px;
+  border-radius: var(--radius);
+}
+
+.opt-brand:hover {
+  background: var(--bg-row);
+}
+
+.opt-brand:hover .opt-back {
+  color: var(--accent);
+  transform: translateX(-2px);
+}
+
+.opt-back {
+  font-size: 18px;
+  color: var(--fg-muted);
+  line-height: 1;
+  font-weight: 400;
+  transition: color 120ms ease-out, transform 120ms ease-out;
 }
 
 .opt-helmet {

src/options/options.html

@@ -9,10 +9,11 @@
 <body>
 
   <header class="opt-header">
-    <div class="opt-brand">
+    <a href="../newtab/newtab.html" class="opt-brand" title="Back to RangerHQ Tuner">
+      <span class="opt-back" aria-hidden="true">←</span>
       <img src="../assets/img/ranger.png" alt="" class="opt-helmet">
       <h1>RangerHQ Tuner — Options</h1>
-    </div>
+    </a>
     <span class="opt-version" id="opt-version">v—</span>
   </header>
 
@@ -59,6 +60,30 @@
       </div>
     </section>
 
+    <section class="opt-card">
+      <h2>Appearance</h2>
+      <div class="opt-row">
+        <label>
+          Theme
+          <span class="opt-help">Auto follows your OS setting. Dark / Light overrides it.</span>
+        </label>
+        <div class="opt-theme-row" role="radiogroup" aria-label="Theme">
+          <label>
+            <input type="radio" name="opt-theme" value="auto" id="opt-theme-auto">
+            <span>Auto</span>
+          </label>
+          <label>
+            <input type="radio" name="opt-theme" value="dark" id="opt-theme-dark">
+            <span>Dark</span>
+          </label>
+          <label>
+            <input type="radio" name="opt-theme" value="light" id="opt-theme-light">
+            <span>Light</span>
+          </label>
+        </div>
+      </div>
+    </section>
+
     <section class="opt-card">
       <h2>Playback</h2>
       <div class="opt-row opt-row--inline">

src/options/options.js

@@ -9,6 +9,10 @@ import {
   getHistoryCap, setHistoryCap,
   clearHistory, clearFavourites, clearAll,
 } from '../lib/history.js';
+import {
+  THEME_KEY, THEME_DEFAULT, VALID_THEMES,
+  getTheme, setTheme, applyTheme,
+} from '../lib/theme.js';
 
 const STORAGE_KEYS = {
   stations:    'tuner.stationsCache',
@@ -39,6 +43,11 @@ init().catch(err => {
 
 async function init() {
   els.version.textContent = `v${chrome.runtime.getManifest().version}`;
+
+  // Theme — apply stored preference + wire the radio group + listen for
+  // cross-surface changes (popup/newtab pick a theme → Options reflects).
+  await initThemeUI();
+
   await refreshStats();
   await refreshPlayback();
 
@@ -86,6 +95,12 @@ async function init() {
   // Refresh stats live if storage changes from another surface
   chrome.storage.onChanged.addListener((changes, area) => {
     if (area !== 'local') return;
+    if (changes[THEME_KEY]) {
+      const v = changes[THEME_KEY].newValue || THEME_DEFAULT;
+      applyTheme(v);
+      const radio = document.querySelector(`input[name="opt-theme"][value="${v}"]`);
+      if (radio) radio.checked = true;
+    }
     if (Object.keys(changes).some(k => k.startsWith('tuner.'))) {
       refreshStats();
       refreshPlayback();
@@ -93,6 +108,23 @@ async function init() {
   });
 }
 
+/** Apply the stored theme, check the matching radio, wire change handlers. */
+async function initThemeUI() {
+  const current = await getTheme();
+  applyTheme(current);
+  const checked = document.querySelector(`input[name="opt-theme"][value="${current}"]`);
+  if (checked) checked.checked = true;
+  for (const r of document.querySelectorAll('input[name="opt-theme"]')) {
+    r.addEventListener('change', async (e) => {
+      const v = e.target.value;
+      if (!VALID_THEMES.includes(v)) return;
+      await setTheme(v);
+      applyTheme(v);
+      toast(`Theme: ${v}`);
+    });
+  }
+}
+
 async function refreshStats() {
   const [history, favs, all] = await Promise.all([
     getHistory(),

src/popup/popup.css

@@ -14,8 +14,62 @@
   --cream:      #f4e9b7;
   --danger:     #c9685b;
   --radius:     6px;
+
+  /* First-run hint pulse colour (RGB tuple — alpha applied in keyframes). */
+  --pulse-rgb:  109, 191, 122;
 }
 
+/* ──────────────────────────────────────────────────────────────────────
+   Light mode (v0.5.0) — auto-follows OS theme via prefers-color-scheme.
+   Flips backgrounds + foregrounds to a cream-leaning palette while
+   preserving the brand green as the accent. Every existing rule that
+   uses the var(--*) tokens keeps working unchanged.
+   ────────────────────────────────────────────────────────────────────── */
+/* Shared light palette block — used as a mixin by the @media (OS-follow)
+   rule below AND by the html[data-theme="light"] manual override. */
+@media (prefers-color-scheme: light) {
+  :root {
+    --bg:         #f6f4ed;    /* cream-leaning off-white */
+    --bg-soft:    #ece5d2;    /* slightly darker for header bars */
+    --bg-row:     #ddd6c0;    /* hover background */
+    --bg-row-hi:  #c8c0a8;    /* active row background */
+    --fg:         #2a2f28;    /* dark forest-green-leaning text */
+    --fg-muted:   #6a7064;    /* muted secondary text */
+    --accent:     #2a7d3e;    /* darker brand green for primary contrast */
+    --accent-dim: #6dbf7a;    /* lighter brand green for fills */
+    --cream:      #b8861a;    /* darker amber — readable on light bg */
+    --danger:     #b53a2b;    /* darker red — readable on light bg */
+  }
+  .tuner-state[data-state="playing"]   { color: #fff; }
+  .tuner-state[data-state="buffering"] { color: #fff; }
+  .tuner-state[data-state="error"]     { color: #fff; }
+  .btn-primary[aria-pressed="true"]    { color: #fff; }
+}
+
+/* Manual override — force LIGHT palette regardless of OS. The attribute
+   selector beats both :root and the @media rule's :root on specificity. */
+html[data-theme="light"] {
+  --bg: #f6f4ed; --bg-soft: #ece5d2; --bg-row: #ddd6c0; --bg-row-hi: #c8c0a8;
+  --fg: #2a2f28; --fg-muted: #6a7064; --accent: #2a7d3e; --accent-dim: #6dbf7a;
+  --cream: #b8861a; --danger: #b53a2b;
+}
+html[data-theme="light"] .tuner-state[data-state="playing"]   { color: #fff; }
+html[data-theme="light"] .tuner-state[data-state="buffering"] { color: #fff; }
+html[data-theme="light"] .tuner-state[data-state="error"]     { color: #fff; }
+html[data-theme="light"] .btn-primary[aria-pressed="true"]    { color: #fff; }
+
+/* Manual override — force DARK palette regardless of OS. Overrides the
+   @media block when OS is light but user explicitly wants dark. */
+html[data-theme="dark"] {
+  --bg: #0f1411; --bg-soft: #1a221c; --bg-row: #1f2823; --bg-row-hi: #2a3530;
+  --fg: #e8e4d4; --fg-muted: #97a094; --accent: #6dbf7a; --accent-dim: #2a7d3e;
+  --cream: #f4e9b7; --danger: #c9685b;
+}
+html[data-theme="dark"] .tuner-state[data-state="playing"]   { color: var(--bg); }
+html[data-theme="dark"] .tuner-state[data-state="buffering"] { color: var(--bg); }
+html[data-theme="dark"] .tuner-state[data-state="error"]     { color: var(--cream); }
+html[data-theme="dark"] .btn-primary[aria-pressed="true"]    { color: var(--bg); }
+
 * { box-sizing: border-box; }
 
 html, body {

src/popup/popup.js

@@ -4,6 +4,7 @@
 
 import { TARGETS, TYPES } from '../lib/messages.js';
 import { listAllStations, getSource } from '../sources/index.js';
+import { THEME_KEY, THEME_DEFAULT, initTheme, applyTheme } from '../lib/theme.js';
 
 const els = {
   statePill:  document.getElementById('state-pill'),
@@ -42,6 +43,10 @@ init().catch(err => {
 });
 
 async function init() {
+  // 0. Apply theme preference (v0.5.0) before anything paints, to avoid
+  // a brief dark flash if the user has picked light.
+  await initTheme();
+
   // 1. Hydrate UI from cached state so the popup renders fast.
   const stored = await chrome.storage.local.get(Object.values(STORAGE_KEYS));
   if (typeof stored[STORAGE_KEYS.volume] === 'number') {
@@ -118,6 +123,10 @@ async function init() {
   chrome.storage.onChanged.addListener((changes, area) => {
     if (area !== 'local') return;
 
+    if (changes[THEME_KEY]) {
+      applyTheme(changes[THEME_KEY].newValue || THEME_DEFAULT);
+    }
+
     if (changes[STORAGE_KEYS.currentId] && stations.length) {
       const newId = changes[STORAGE_KEYS.currentId].newValue;
       currentStation = stations.find(s => s.id === newId) || null;