diff --git a/docs/theme.md b/docs/theme.md
new file mode 100644
index 0000000..4126c77
--- /dev/null
+++ b/docs/theme.md
@@ -0,0 +1,44 @@
+# Light and dark
+
+diora has two colour schemes, **dark** (the old look) and **light**, chosen by the reader:
+"Dunkel", "Hell" or "Automatisch" (as the operating system says). This file is the contract
+between diora-web (app.css, home.js, templates), diora-android (native.css, native-*.js,
+podcast-ui.css, feeds.js) and diora-desktop (desktop.css).
+
+## Switching
+
+* `<html data-theme="dark|light">` is the scheme in effect. Set as early as possible
+  (an inline script in base.html's `<head>`, before any CSS paints) so nothing flashes.
+* The choice is `localStorage.diora_theme` = `"dark"` (default) | `"light"` | `"auto"`.
+* `window.__dioraTheme()` → the choice; `window.__dioraSetTheme(choice)` sets and applies it;
+  `window.__dioraThemeChanged` (event `diora-theme` on `window`, `detail` = the scheme in
+  effect) lets native code follow (Android status/navigation bars, Electron's window colour).
+* "auto" follows `prefers-color-scheme` live.
+* E-ink mode (`html.nui-eink`) keeps its own black-on-white rules and ignores this.
+* The reader has its own themes; its default is now "Wie die App" (`readerSettings.theme = 'app'`):
+  dark → reader dark, light → reader bright. Sepia, Dunkel and Hell stay choosable.
+* A wallpaper (the radio page's background image) keeps its own contrast handling
+  (`body.bright-bg`, the ◑ button); without a wallpaper the scheme decides.
+
+## Colours: only through these variables
+
+| variable | dark | light | for |
+|---|---|---|---|
+| `--bg` | `#000` | `#f6f5f1` | the page |
+| `--fg` | `#fff` | `#17171a` | text |
+| `--muted` | `#9a9a9a` | `#66666b` | secondary text, icons |
+| `--card` | `#0b0b0b` | `#ffffff` | cards, rows that stand out |
+| `--panel` | `#111` | `#ffffff` | sheets, menus, docks, bars |
+| `--hover` | `#141414` | `#ecebe6` | hover / pressed |
+| `--raised` | `#1a1a1a` | `#e4e2dc` | inputs, tracks of sliders, chips |
+| `--border` | `#2a2a2a` | `#d9d6ce` | lines |
+| `--border-strong` | `#444` | `#b4b0a6` | lines that must show (inputs, focus off) |
+| `--accent` | `#e63946` | `#d0263a` | the red: brand, active, progress |
+| `--on-accent` | `#fff` | `#fff` | text on the red |
+| `--scrim` | `rgba(0,0,0,.6)` | `rgba(20,20,20,.35)` | behind sheets |
+| `--shadow` | `none` | `0 1px 3px rgba(0,0,0,.08)` | cards in light (no lines needed in dark) |
+
+Old names stay as aliases: `--nui-muted: var(--muted)`, `--nui-panel: var(--panel)`,
+`--text: var(--fg)`, `--text-muted: var(--muted)`, `--bg-card: var(--card)`.
+Images, album art, covers and Ambient's own picture keep their colours. Status colours
+(`--green`, `--yellow`, `--red`) may stay as they are.
diff --git a/static/css/app.css b/static/css/app.css
index 36e4a4b..5689138 100644
--- a/static/css/app.css
+++ b/static/css/app.css
@@ -47,13 +47,13 @@
 html, body {
   height: 100%;
   overflow: hidden;
-  scrollbar-color: #333 #000;
+  scrollbar-color: var(--raised) var(--bg);
 }
 
 ::-webkit-scrollbar { width: 8px; height: 8px; }
-::-webkit-scrollbar-track { background: #000; }
-::-webkit-scrollbar-thumb { background: #333; border-radius: 4px; }
-::-webkit-scrollbar-thumb:hover { background: #555; }
+::-webkit-scrollbar-track { background: var(--bg); }
+::-webkit-scrollbar-thumb { background: var(--raised); border-radius: 4px; }
+::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }
 
 :root {
   --bg: #000;
@@ -77,6 +77,42 @@ html, body {
   --outline: #000;
   --text: var(--fg);
   --text-muted: var(--fg);
+
+  /* The colour scheme (docs/theme.md): dark here, light below. Use only these. */
+  --muted: #9a9a9a;
+  --card: #0b0b0b;
+  --panel: #111;
+  --hover: #141414;
+  --raised: #1a1a1a;
+  --border-strong: #444;
+  --on-accent: #fff;
+  --scrim: rgba(0, 0, 0, 0.6);
+  --shadow: none;
+  --surface: var(--panel);
+  color-scheme: dark;
+}
+
+html[data-theme="light"] {
+  --bg: #f6f5f1;
+  --fg: #17171a;
+  --fg-muted: #17171a;
+  --muted: #66666b;
+  --card: #fff;
+  --panel: #fff;
+  --hover: #ecebe6;
+  --raised: #e4e2dc;
+  --border: #d9d6ce;
+  --border-strong: #b4b0a6;
+  --accent: #d0263a;
+  --accent-hover: #b51f31;
+  --on-accent: #fff;
+  --scrim: rgba(20, 20, 20, 0.35);
+  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
+  --bg-card: var(--card);
+  --bg-alt: var(--hover);
+  /* Outlined text is for wallpapers (body.bright-bg / a dark picture); on plain light, none. */
+  --outline: transparent;
+  color-scheme: light;
 }
 
 /* inverted: black on white */
@@ -395,7 +431,7 @@ a:hover {
   width: 100%;
   height: 70vh;
   border: 0;
-  background: #000;
+  background: var(--bg);
 }
 
 .sub-tabs {
@@ -477,7 +513,7 @@ a:hover {
 
 .data-table tbody tr:nth-child(odd)  { background: transparent; }
 .data-table tbody tr:nth-child(even) { background: transparent; }
-.data-table tbody tr:hover { background: rgba(255, 255, 255, 0.05); }
+.data-table tbody tr:hover { background: var(--hover); }
 
 .empty-msg {
   color: var(--text-muted);
@@ -508,14 +544,14 @@ a:hover {
   white-space: nowrap;
 }
 .btn:hover {
-  background: rgba(255, 255, 255, 0.07);
-  border-color: #444;
+  background: var(--hover);
+  border-color: var(--border-strong);
 }
 
 .btn-play {
   background: var(--accent);
   border-color: var(--accent);
-  color: #fff;
+  color: var(--on-accent);
   font-size: 0.9rem;
   padding: 0.4rem 1rem;
 }
@@ -524,14 +560,14 @@ a:hover {
   border-color: var(--accent-hover);
 }
 .btn-play.playing {
-  background: #333;
-  border-color: #555;
+  background: var(--raised);
+  border-color: var(--border-strong);
   color: var(--text);
 }
 
 .btn-save {
   color: var(--yellow);
-  border-color: #444;
+  border-color: var(--border-strong);
 }
 .btn-save:hover {
   background: #2a2a00;
@@ -546,7 +582,7 @@ a:hover {
 .btn-primary {
   background: var(--accent);
   border-color: var(--accent);
-  color: #fff;
+  color: var(--on-accent);
 }
 .btn-primary:hover {
   background: var(--accent-hover);
@@ -562,6 +598,9 @@ a:hover {
   border-color: #a00;
   color: #fff;
 }
+html[data-theme="light"] .btn-danger { background: #fdecee; border-color: #e7a3aa; color: #a3172a; }
+html[data-theme="light"] .btn-danger:hover { background: #a3172a; border-color: #a3172a; color: #fff; }
+html[data-theme="light"] .btn-save:hover { background: #fbf3d3; }
 
 .btn-lastfm {
   background: #d51007;
@@ -688,6 +727,7 @@ a:hover {
   border-radius: var(--radius);
   padding: 0.5rem 0.75rem;
 }
+html[data-theme="light"] .form-errors { background: #fdecee; border-color: #e7a3aa; }
 
 .field-help {
   color: var(--text-muted);
@@ -929,7 +969,7 @@ a:hover {
 
 .recommendations-section {
   padding: 12px 16px 4px;
-  border-bottom: 1px solid #222;
+  border-bottom: 1px solid var(--border);
 }
 .recommendations-context {
   font-size: 0.75rem;
@@ -1009,7 +1049,7 @@ a:hover {
   display: flex;
   align-items: center;
   gap: 10px;
-  border-bottom: 1px solid #1a1a1a;
+  border-bottom: 1px solid var(--border);
 }
 
 /* =========================================================
@@ -1108,13 +1148,13 @@ body.dnd-mode .timer-display {
   flex-wrap: wrap;
   gap: 6px;
   padding: 8px 16px;
-  border-bottom: 1px solid #1a1a1a;
+  border-bottom: 1px solid var(--border);
 }
 
 .mood-chip {
   background: transparent;
-  border: 1px solid #333;
-  color: #ccc;
+  border: 1px solid var(--border);
+  color: var(--fg);
   border-radius: 999px;
   padding: 3px 12px;
   font-size: 0.78rem;
@@ -1123,8 +1163,8 @@ body.dnd-mode .timer-display {
 }
 
 .mood-chip:hover {
-  background: rgba(255, 255, 255, 0.05);
-  border-color: #555;
+  background: var(--hover);
+  border-color: var(--border-strong);
 }
 
 .focus-today {
@@ -1274,7 +1314,7 @@ body.dnd-mode .timer-display {
 .sidebar-overlay {
   position: fixed;
   inset: 0;
-  background: rgba(0, 0, 0, 0.45);
+  background: var(--scrim);
   z-index: 299;
 }
 
@@ -1334,7 +1374,7 @@ body.dnd-mode .timer-display {
 .modal-overlay {
   position: fixed;
   inset: 0;
-  background: rgba(0, 0, 0, 0.55);
+  background: var(--scrim);
   z-index: 500;
 }
 
@@ -1417,7 +1457,7 @@ body.dnd-mode .timer-display {
 .book-drop-zone:hover,
 .book-drop-zone.drag-over {
   border-color: var(--accent);
-  background: rgba(255,255,255,0.04);
+  background: var(--hover);
 }
 .book-drop-zone label {
   color: var(--accent);
@@ -1791,13 +1831,13 @@ body.reader-immersive.reader-show-bottom .reader-overlay  { bottom: var(--bar-h)
   display: flex;
   align-items: center;
   justify-content: center;
-  background: rgba(20, 20, 20, 0.85);
+  background: var(--scrim);
   z-index: 200;
 }
 .pdf-loading-spinner {
   width: 36px;
   height: 36px;
-  border: 3px solid #333;
+  border: 3px solid var(--raised);
   border-top-color: var(--accent, #e63946);
   border-radius: 50%;
   animation: pdf-spin 0.7s linear infinite;
@@ -1814,7 +1854,7 @@ body.reader-immersive.reader-show-bottom .reader-overlay  { bottom: var(--bar-h)
 /* Highlight popover */
 .highlight-popover { position:fixed; z-index:500; display:flex; gap:6px; background:var(--bg-card,#1a1a1a); border:1px solid var(--border); border-radius:var(--radius); padding:6px 8px; box-shadow:0 4px 16px rgba(0,0,0,.5); }
 .hl-color-btn { width:24px; height:24px; border-radius:50%; border:2px solid transparent; cursor:pointer; font-weight:700; font-size:12px; color:#000; line-height:1; }
-.hl-color-btn:hover { border-color:#fff; }
+.hl-color-btn:hover { border-color:var(--fg); }
 .hl-note-btn { background:none; border:1px solid var(--border); color:var(--fg); padding:2px 6px; border-radius:var(--radius); cursor:pointer; }
 
 /* Footnote popover */
@@ -1908,7 +1948,7 @@ body.reader-immersive.reader-show-bottom .reader-overlay  { bottom: var(--bar-h)
    here. */
 .note-bottom-sheet { position:fixed; inset:0; z-index:650; }
 .note-bottom-sheet-backdrop {
-  position:absolute; inset:0; background:rgba(0,0,0,.5);
+  position:absolute; inset:0; background:var(--scrim);
   opacity:0; transition:opacity .2s ease; pointer-events:none;
 }
 .note-bottom-sheet.open .note-bottom-sheet-backdrop { opacity:1; pointer-events:auto; }
@@ -1951,7 +1991,9 @@ mark.tts-current { background:rgba(230,57,70,.55); color:inherit; border-radius:
 @keyframes toast-fade { 0%,70%{opacity:1} 100%{opacity:0} }
 
 .reader-toast-action { display:flex; align-items:center; gap:10px; padding:8px 8px 8px 14px; animation:toast-slide-up 0.2s ease forwards; pointer-events:auto; }
-.reader-toast-btn { background:var(--accent,#e63946); color:#fff; border:none; border-radius:calc(var(--radius) - 2px); padding:5px 12px; font-family:var(--font); font-size:13px; font-weight:600; cursor:pointer; white-space:nowrap; }
+/* The apps: the player bar sits in the reader, above its footer; notices go above both. */
+html.nui-reading .reader-toast { bottom:calc(var(--nui-dock-h, 0px) + 40px); }
+.reader-toast-btn { background:var(--accent,#e63946); color:var(--on-accent); border:none; border-radius:calc(var(--radius) - 2px); padding:5px 12px; font-family:var(--font); font-size:13px; font-weight:600; cursor:pointer; white-space:nowrap; }
 .reader-toast-btn:hover { filter:brightness(1.1); }
 @keyframes toast-slide-up { 0%{opacity:0; transform:translate(-50%, 8px);} 100%{opacity:1; transform:translate(-50%, 0);} }
 
@@ -1960,7 +2002,7 @@ mark.tts-current { background:rgba(230,57,70,.55); color:inherit; border-radius:
   bottom: 4px;
   right: 6px;
   font-size: 0.65rem;
-  color: #444;
+  color: var(--border-strong);
   pointer-events: none;
   z-index: 1;
 }
diff --git a/static/js/app.js b/static/js/app.js
index e7ac60e..1dad5a3 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -1629,6 +1629,12 @@ function applyAccent(entry) {
   root.style.setProperty('--accent-hover', entry.hover);
 }
 
+// Light and dark: the switch is in base.html (every page has it). The reader's
+// "Wie die App" follows it.
+window.addEventListener('diora-theme', () => {
+  if (currentBookId) applyReaderSettings(!!currentPdfDoc);
+});
+
 function setScheme(bright) {
   document.body.classList.toggle('bright-bg', bright);
   const btn = document.getElementById('contrast-toggle');
@@ -1736,6 +1742,8 @@ async function applyEncryptedBackground() {
     const blob = new Blob([plain], {type: ENCRYPTED_BG.mime || 'image/jpeg'});
     const url = URL.createObjectURL(blob);
     document.body.style.backgroundImage = `url('${url}')`;
+    const contrastBtn = document.getElementById('contrast-toggle');
+    if (contrastBtn) contrastBtn.hidden = false; // only with a picture behind the page
     document.body.style.backgroundSize = 'cover';
     document.body.style.backgroundPosition = 'center';
     document.body.style.backgroundAttachment = 'fixed';
@@ -3770,6 +3778,8 @@ let ttsAudio = null;
 let ttsCurrentMark = null;
 let ttsBarEl = null;
 let ttsLang = localStorage.getItem('diora_tts_lang') || 'de';
+let _ttsBlocks = null;  // the book's blocks while reading aloud
+let _ttsCur = null;     // what's being read: {bi, si, sentence, block}
 
 function setTtsLang(lang) {
   ttsLang = lang;
@@ -3862,15 +3872,19 @@ function _ttsPlayBlob(blob) {
   });
 }
 
-// Walks blocks/sentences from startBlockIndex onward, fetching one sentence
-// ahead while the current one plays so there's no gap between them.
-async function _ttsPlayLoop(blocks, startBlockIndex, runToken) {
+// Walks blocks/sentences from startBlockIndex (and its sentence startSentence)
+// onward, fetching one sentence ahead while the current one plays so there's
+// no gap between them.
+async function _ttsPlayLoop(blocks, startBlockIndex, runToken, startSentence = 0) {
   function* sentenceStream() {
     for (let bi = startBlockIndex; bi < blocks.length; bi++) {
       const block = blocks[bi];
       const text = (block.textContent || '').trim();
       if (!text) continue;
-      for (const sentence of _ttsSplitSentences(text)) yield {block, sentence};
+      const sentences = _ttsSplitSentences(text);
+      for (let si = bi === startBlockIndex ? startSentence : 0; si < sentences.length; si++) {
+        yield {block, sentence: sentences[si], bi, si};
+      }
     }
   }
 
@@ -3896,8 +3910,14 @@ async function _ttsPlayLoop(blocks, startBlockIndex, runToken) {
     }
     if (runToken !== ttsRunToken) return;
 
-    if (block !== lastBlock) { lastBlock = block; blockSearchOffset = 0; }
+    if (block !== lastBlock) {
+      lastBlock = block;
+      // Started in the middle of a block (previous/next sentence): find it from there.
+      blockSearchOffset = _ttsOffsetOf(block, cur.value.si);
+    }
+    _ttsCur = {bi: cur.value.bi, si: cur.value.si, sentence, block};
     blockSearchOffset = _ttsHighlightSentence(block, sentence, blockSearchOffset);
+    _ttsNotify();
 
     await _ttsPlayBlob(audioBlob);
     if (runToken !== ttsRunToken) return;
@@ -3915,8 +3935,90 @@ function _ttsTogglePause() {
     else ttsAudio.play().catch(() => {});
   }
   _ttsUpdateBar();
+  _ttsNotify();
 }
 
+// ---- read-aloud for a player bar (the shared dock in native-podcast.js) ----------
+// window.__dioraTts: state(), toggle(), stop(), next(), prev(); a 'diora-tts'
+// event on window after every change. A dock that shows it sets
+// window.__dioraTtsDock = true, and the reader's own little bar stays away.
+
+function _ttsState() {
+  const meta = (currentBookId && bookMetaCache[currentBookId]) || {};
+  const cur = _ttsCur;
+  const chapterEl = cur && cur.block.closest('[data-epub-src]');
+  const blocks = _ttsBlocks || [];
+  return {
+    active: ttsActive,
+    paused: ttsPaused,
+    bookId: currentBookId,
+    title: meta.title || '',
+    author: meta.author || '',
+    chapter: chapterEl ? _tocTitleForChapterSrc(chapterEl.dataset.epubSrc) : '',
+    sentence: cur ? cur.sentence : '',
+    progress: cur && blocks.length ? cur.bi / blocks.length : 0,
+  };
+}
+
+function _ttsNotify() {
+  try { window.dispatchEvent(new CustomEvent('diora-tts', {detail: _ttsState()})); } catch (e) {}
+}
+
+// Read from another sentence on: the one before/after the current one.
+function _ttsRestartAt(bi, si) {
+  const blocks = _ttsBlocks;
+  if (!ttsActive || !blocks) return;
+  ttsRunToken++;
+  const runToken = ttsRunToken;
+  if (ttsAudio) {
+    try { ttsAudio.pause(); ttsAudio.src = ''; } catch (e) {}
+    ttsAudio = null;
+  }
+  _ttsPlayLoop(blocks, bi, runToken, si);
+}
+
+// Where sentence si of a block starts in its text (for the highlight).
+function _ttsOffsetOf(block, si) {
+  const full = block.textContent || '';
+  let off = 0;
+  _ttsSplitSentences(full.trim()).slice(0, si).forEach(s => {
+    const k = full.indexOf(s, off);
+    if (k >= 0) off = k + s.length;
+  });
+  return off;
+}
+
+function _ttsSentenceCount(block) {
+  const text = (block.textContent || '').trim();
+  return text ? _ttsSplitSentences(text).length : 0;
+}
+
+function _ttsStep(dir) {
+  const cur = _ttsCur;
+  const blocks = _ttsBlocks;
+  if (!cur || !blocks) return;
+  if (dir > 0) {
+    if (cur.si + 1 < _ttsSentenceCount(cur.block)) return _ttsRestartAt(cur.bi, cur.si + 1);
+    for (let bi = cur.bi + 1; bi < blocks.length; bi++) if (_ttsSentenceCount(blocks[bi])) return _ttsRestartAt(bi, 0);
+    stopReadAloud();
+  } else {
+    if (cur.si > 0) return _ttsRestartAt(cur.bi, cur.si - 1);
+    for (let bi = cur.bi - 1; bi >= 0; bi--) {
+      const n = _ttsSentenceCount(blocks[bi]);
+      if (n) return _ttsRestartAt(bi, n - 1);
+    }
+    _ttsRestartAt(cur.bi, 0);
+  }
+}
+
+window.__dioraTts = {
+  state: _ttsState,
+  toggle: () => (ttsActive ? _ttsTogglePause() : startReadAloud()),
+  stop: () => stopReadAloud(),
+  next: () => _ttsStep(1),
+  prev: () => _ttsStep(-1),
+};
+
 function _ttsUpdateBar() {
   if (!ttsBarEl) return;
   const btn = ttsBarEl.querySelector('.tts-pause-btn');
@@ -3925,6 +4027,7 @@ function _ttsUpdateBar() {
 
 function _ttsShowBar() {
   _ttsRemoveBar();
+  if (window.__dioraTtsDock) return; // the player bar shows it
   const bar = document.createElement('div');
   bar.className = 'tts-bar';
   bar.innerHTML = `
@@ -3968,10 +4071,13 @@ function startReadAloud() {
   ttsPaused = false;
   ttsRunToken++;
   const runToken = ttsRunToken;
+  _ttsBlocks = blocks;
+  _ttsCur = null;
 
   const btn = $('reader-tts-btn');
   if (btn) { btn.classList.add('active'); btn.title = 'Vorlesen beenden'; }
   _ttsShowBar();
+  _ttsNotify();
 
   _ttsPlayLoop(blocks, startIndex, runToken);
 }
@@ -3986,8 +4092,11 @@ function stopReadAloud() {
   }
   _ttsClearHighlight();
   _ttsRemoveBar();
+  _ttsBlocks = null;
+  _ttsCur = null;
   const btn = $('reader-tts-btn');
   if (btn) { btn.classList.remove('active'); btn.title = 'Vorlesen'; }
+  _ttsNotify();
 }
 
 // ---------------------------------------------------------------------------
@@ -4647,7 +4756,7 @@ function _readerTypeDefaults() {
 
 function loadReaderSettings(bookId) {
   // Reset to defaults, then apply per-book overrides
-  Object.assign(readerSettings, { theme: 'dark', fontFamily: 'serif', noBold: false,
+  Object.assign(readerSettings, { theme: 'app', fontFamily: 'serif', noBold: false,
                                    pdfZoom: 100, pdfInverted: false, pdfPaginated: false, pdfSpread: false },
                 _readerTypeDefaults());
   try {
@@ -4659,6 +4768,8 @@ function loadReaderSettings(bookId) {
         if (saved[key] === old) delete saved[key];
       }
     }
+    // Before v3 the reader's theme was always stored, "dark" by default: that now means "Wie die App".
+    if ((saved.v || 0) < 3 && saved.theme === 'dark') delete saved.theme;
     delete saved.v;
     Object.assign(readerSettings, saved);
     if (saved.pdfPaginated === undefined) {
@@ -4669,7 +4780,7 @@ function loadReaderSettings(bookId) {
 
 function saveReaderSettings() {
   if (currentBookId) {
-    localStorage.setItem(`diora_reader_settings_${currentBookId}`, JSON.stringify({ ...readerSettings, v: 2 }));
+    localStorage.setItem(`diora_reader_settings_${currentBookId}`, JSON.stringify({ ...readerSettings, v: 3 }));
   }
 }
 
@@ -4708,8 +4819,11 @@ function applyReaderSettings(isPdf) {
 
   // Theme
   overlay.classList.remove('reader-theme-sepia', 'reader-theme-bright');
-  if (readerSettings.theme === 'sepia') overlay.classList.add('reader-theme-sepia');
-  else if (readerSettings.theme === 'bright') overlay.classList.add('reader-theme-bright');
+  const readerTheme = readerSettings.theme === 'app'
+    ? (document.documentElement.getAttribute('data-theme') === 'light' ? 'bright' : 'dark')
+    : readerSettings.theme;
+  if (readerTheme === 'sepia') overlay.classList.add('reader-theme-sepia');
+  else if (readerTheme === 'bright') overlay.classList.add('reader-theme-bright');
 
   // PDF invert
   if (isPdf && readerSettings.pdfInverted) overlay.classList.add('pdf-inverted');
@@ -4767,6 +4881,7 @@ function toggleSettingsPanel() {
       <button class="btn btn-sm ${readerSettings.fontFamily === 'humanist' ? 'active' : ''}" data-rs-font="humanist">Verdana</button>
       <button class="btn btn-sm ${readerSettings.fontFamily === 'mono'     ? 'active' : ''}" data-rs-font="mono">Mono</button>
       <button class="btn btn-sm ${readerSettings.noBold ? 'active' : ''}" id="rs-no-bold">Kein Fett</button>
+      <button class="btn btn-sm ${readerSettings.theme === 'app'    ? 'active' : ''}" data-rs-theme="app">Wie die App</button>
       <button class="btn btn-sm ${readerSettings.theme === 'dark'   ? 'active' : ''}" data-rs-theme="dark">Dunkel</button>
       <button class="btn btn-sm ${readerSettings.theme === 'sepia'  ? 'active' : ''}" data-rs-theme="sepia">Sepia</button>
       <button class="btn btn-sm ${readerSettings.theme === 'bright' ? 'active' : ''}" data-rs-theme="bright">Hell</button>
diff --git a/static/js/home.js b/static/js/home.js
index e50cf7f..712ad66 100644
--- a/static/js/home.js
+++ b/static/js/home.js
@@ -331,27 +331,27 @@
     '#tab-home .home-brand { font-size: 26px; font-weight: 700; color: var(--accent, #e63946); margin: 4px 0 18px; letter-spacing: 0.05em; }',
     '#tab-home .home-section { margin-bottom: 22px; }',
     '#tab-home .home-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 8px; }',
-    '#tab-home .home-head h2 { margin: 0; font-size: 12px; font-weight: 400; text-transform: uppercase; letter-spacing: 0.08em; color: var(--nui-muted, #9a9a9a); }',
-    '#tab-home .home-more { background: none; border: none; color: var(--nui-muted, #9a9a9a); font: inherit; font-size: 12px; cursor: pointer; padding: 4px 0; }',
-    '#tab-home .home-card { display: flex; align-items: center; gap: 12px; width: 100%; box-sizing: border-box; padding: 14px; border: 1px solid var(--border, #2a2a2a); border-radius: 6px; background: #0b0b0b; color: inherit; font: inherit; text-align: left; }',
+    '#tab-home .home-head h2 { margin: 0; font-size: 12px; font-weight: 400; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted, #9a9a9a); }',
+    '#tab-home .home-more { background: none; border: none; color: var(--muted, #9a9a9a); font: inherit; font-size: 12px; cursor: pointer; padding: 4px 0; }',
+    '#tab-home .home-card { display: flex; align-items: center; gap: 12px; width: 100%; box-sizing: border-box; padding: 14px; border: 1px solid var(--border, #2a2a2a); border-radius: 6px; background: var(--card, #0b0b0b); box-shadow: var(--shadow, none); color: inherit; font: inherit; text-align: left; }',
     '#tab-home button.home-card, #tab-home .home-pod-text, #tab-home .home-row, #tab-home .home-station { cursor: pointer; }',
     '#tab-home .home-main { flex-wrap: nowrap; }',
     '#tab-home button.home-main { flex-direction: column; align-items: flex-start; gap: 3px; }',
-    '#tab-home .home-empty { color: var(--nui-muted, #9a9a9a); justify-content: space-between; }',
+    '#tab-home .home-empty { color: var(--muted, #9a9a9a); justify-content: space-between; }',
     '#tab-home .home-kicker { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent, #e63946); }',
     '#tab-home .home-title { font-size: 16px; font-weight: 700; line-height: 1.3; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }',
-    '#tab-home .home-sub { font-size: 13px; color: var(--nui-muted, #9a9a9a); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100%; }',
-    '#tab-home .home-state { display: flex; align-items: center; gap: 8px; margin-top: 6px; font-size: 12px; color: var(--nui-muted, #9a9a9a); }',
-    '#tab-home .home-bar { display: inline-block; width: 160px; max-width: 40vw; height: 4px; border-radius: 2px; background: #2a2a2a; overflow: hidden; }',
+    '#tab-home .home-sub { font-size: 13px; color: var(--muted, #9a9a9a); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100%; }',
+    '#tab-home .home-state { display: flex; align-items: center; gap: 8px; margin-top: 6px; font-size: 12px; color: var(--muted, #9a9a9a); }',
+    '#tab-home .home-bar { display: inline-block; width: 160px; max-width: 40vw; height: 4px; border-radius: 2px; background: var(--raised, #2a2a2a); overflow: hidden; }',
     '#tab-home .home-bar > span { display: block; height: 100%; background: var(--accent, #e63946); }',
     '#tab-home .home-pod-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 3px; }',
-    '#tab-home .home-art { width: 56px; height: 56px; flex: none; border-radius: 4px; object-fit: cover; background: #1a1a1a; }',
+    '#tab-home .home-art { width: 56px; height: 56px; flex: none; border-radius: 4px; object-fit: cover; background: var(--raised, #1a1a1a); }',
     '#tab-home .home-amb-icon { width: 56px; height: 56px; flex: none; border-radius: 4px; background: #14102a; color: #b9a7ff; display: inline-flex; align-items: center; justify-content: center; font-size: 26px; }',
     '#tab-home .home-play { flex: none; min-height: 36px; padding: 0 14px; }',
     '#tab-home .home-list { margin-top: 6px; }',
     '#tab-home .home-row { display: flex; justify-content: space-between; gap: 12px; width: 100%; padding: 10px 14px; background: none; border: none; border-bottom: 1px solid var(--border, #2a2a2a); color: inherit; font: inherit; font-size: 14px; text-align: left; }',
     '#tab-home .home-row-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }',
-    '#tab-home .home-row-side { flex: none; color: var(--nui-muted, #9a9a9a); font-size: 12px; }',
+    '#tab-home .home-row-side { flex: none; color: var(--muted, #9a9a9a); font-size: 12px; }',
     '#tab-home .home-news { flex-direction: column; align-items: stretch; gap: 0; padding: 4px 0; }',
     '#tab-home .home-story { align-items: baseline; }',
     '#tab-home .home-news .home-story:last-child { border-bottom: none; }',
@@ -360,12 +360,12 @@
     '#tab-home .home-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }',
     '#tab-home .home-chip { padding: 6px 12px; border: 1px solid var(--border, #2a2a2a); border-radius: 16px; background: none; color: inherit; font: inherit; font-size: 13px; cursor: pointer; }',
     '#tab-home .home-stations { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 8px; }',
-    '#tab-home .home-station { display: flex; align-items: center; gap: 10px; min-height: 48px; padding: 8px 12px; border: 1px solid var(--border, #2a2a2a); border-radius: 6px; background: #0b0b0b; color: inherit; font: inherit; font-size: 14px; text-align: left; }',
+    '#tab-home .home-station { display: flex; align-items: center; gap: 10px; min-height: 48px; padding: 8px 12px; border: 1px solid var(--border, #2a2a2a); border-radius: 6px; background: var(--card, #0b0b0b); box-shadow: var(--shadow, none); color: inherit; font: inherit; font-size: 14px; text-align: left; }',
     '#tab-home .home-station-icon { color: var(--accent, #e63946); flex: none; }',
     '#tab-home .home-station-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }',
     '#tab-home .home-on { border-color: var(--accent, #e63946); }',
-    '#tab-home .home-note { margin-top: 8px; font-size: 13px; color: var(--nui-muted, #9a9a9a); }',
-    '@media (hover: hover) { #tab-home .home-card:hover, #tab-home .home-station:hover, #tab-home .home-row:hover { background: #141414; } }',
+    '#tab-home .home-note { margin-top: 8px; font-size: 13px; color: var(--muted, #9a9a9a); }',
+    '@media (hover: hover) { #tab-home .home-card:hover, #tab-home .home-station:hover, #tab-home .home-row:hover { background: var(--hover, #141414); } }',
     '.reader-theme-bright #tab-home, body.eink #tab-home .home-card { background: #fff; }',
   ].join('\n');
   document.head.appendChild(style);
diff --git a/static/js/sw.js b/static/js/sw.js
index 2113fd9..32bd9f3 100644
--- a/static/js/sw.js
+++ b/static/js/sw.js
@@ -2,7 +2,7 @@
  * diora service worker — caches the app shell for offline use.
  */
 
-const CACHE = 'diora-v101';
+const CACHE = 'diora-v102';
 const SHELL = [
   '/static/css/app.css',
   '/static/js/app.js',
diff --git a/templates/base.html b/templates/base.html
index 64f4baa..9d26a8a 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -11,6 +11,50 @@
   {% if user.is_authenticated %}<meta name="username" content="{{ user.username }}">{% endif %}
   <link rel="manifest" href="/static/manifest.json">
   <link rel="apple-touch-icon" href="/static/icon-192.png">
+  <script>
+    // Light and dark (docs/theme.md): the choice is "dark", "light" or "auto" (as the
+    // system says). Set before anything paints; every page has it, app.js or not.
+    // Plain ES5: old e-reader WebViews run this too.
+    (function () {
+      var KEY = 'diora_theme';
+      var LABELS = {dark: 'Dunkel', light: 'Hell', auto: 'Automatisch'};
+      var mq = window.matchMedia ? window.matchMedia('(prefers-color-scheme: light)') : null;
+      function choice() {
+        var v = null;
+        try { v = localStorage.getItem(KEY); } catch (e) {}
+        return v === 'light' || v === 'auto' ? v : 'dark';
+      }
+      function scheme() {
+        var c = choice();
+        return c === 'light' || (c === 'auto' && mq && mq.matches) ? 'light' : 'dark';
+      }
+      function apply() {
+        var s = scheme();
+        document.documentElement.setAttribute('data-theme', s);
+        var meta = document.querySelector('meta[name="theme-color"]');
+        if (meta) meta.setAttribute('content', s === 'light' ? '#f6f5f1' : '#000000');
+        var b = document.getElementById('theme-toggle');
+        if (b) {
+          var c = choice();
+          b.textContent = c === 'light' ? '\u2600' : c === 'auto' ? '\u25D0' : '\u263E';
+          b.title = 'Erscheinungsbild: ' + LABELS[c];
+        }
+        try { window.dispatchEvent(new CustomEvent('diora-theme', {detail: s})); } catch (e) {}
+      }
+      window.__dioraTheme = choice;
+      window.__dioraSetTheme = function (c) {
+        try { localStorage.setItem(KEY, LABELS[c] ? c : 'dark'); } catch (e) {}
+        apply();
+      };
+      window.cycleTheme = function () {
+        var order = ['dark', 'light', 'auto'];
+        window.__dioraSetTheme(order[(order.indexOf(choice()) + 1) % order.length]);
+      };
+      if (mq && mq.addEventListener) mq.addEventListener('change', function () { if (choice() === 'auto') apply(); });
+      document.addEventListener('DOMContentLoaded', apply);
+      document.documentElement.setAttribute('data-theme', scheme());
+    })();
+  </script>
   <link rel="stylesheet" href="/static/css/app.css">
   <title>{% block title %}diora{% endblock %}</title>
   <script>const DIORA_CONFIG = { ebookMaxBytes: {{ EBOOK_MAX_BYTES }}, bgMaxBytes: {{ BG_MAX_BYTES }}, podcastInboxPageSize: {{ PODCAST_INBOX_PAGE_SIZE }} };</script>
@@ -22,7 +66,8 @@
   <nav class="navbar">
     <a href="/" class="navbar-brand">diora</a>
     <div class="navbar-links">
-      <button class="btn-icon contrast-toggle" id="contrast-toggle" onclick="toggleContrast()" title="Kontrastmodus an/aus">◑</button>
+      <button class="btn-icon theme-toggle" id="theme-toggle" onclick="cycleTheme()" title="Erscheinungsbild">☾</button>
+      <button class="btn-icon contrast-toggle" id="contrast-toggle" onclick="toggleContrast()" title="Kontrast zum Hintergrundbild" hidden>◑</button>
       {% if user.is_authenticated %}
         <span class="navbar-user">{{ user.username }}</span>
         <a href="{% url 'settings' %}">Einstellungen</a>