commit 33a8b18147e0878e30926f85cdc6ea73f15a5e0c
Author: oliver <oliver@odoo4projects.com>
Date:   Sat Sep 19 07:28:18 2026 -0300

    hallo knut

diff --git a/README.md b/README.md
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+# Interval Timer
+
+A mobile-first interval training timer that installs as a Progressive Web App.
+No build step, no dependencies, no network calls — just static files.
+
+## The cycle
+
+For every set, each exercise gets a **pause** followed by a **training** block:
+
+```
+for each set:
+  for each exercise:
+    pause    (default 15s)   text is grey
+    training (default 45s)   text turns red
+```
+
+- **Start** rings a bell, shows the first exercise in grey and runs the pause.
+- When the pause ends a beep plays and the text turns **red** for the training block.
+- When training ends another beep plays, the next exercise appears and its pause begins.
+- After the last exercise of the last set, a triple bell rings and the screen shows *Workout complete*.
+
+`Pause` / `Resume` freezes the clock; `Reset` returns to the start. The screen is kept
+awake during a session via the Screen Wake Lock API.
+
+## Files
+
+| Path | Purpose |
+| --- | --- |
+| `index.html` | Markup: stage, controls, settings |
+| `styles.css` | Dark theme; grey/red phase colours |
+| `app.js` | Timer state machine, Web Audio bell/beep, exercise list |
+| `manifest.webmanifest` | PWA metadata and icons |
+| `sw.js` | Service worker — app shell cached for offline use |
+| `icons/` | Generated app icons |
+| `tools/make_icons.py` | Regenerates the icons (needs Pillow) |
+| `tools/smoke_test.mjs` | Headless-Chrome test of the whole cycle |
+| `start` | Your local live-server launcher (port 8080) |
+
+Settings and the exercise list are stored in `localStorage`, so they survive a reload.
+
+## Running it on your phone
+
+PWA installation and offline caching require a **secure context** (HTTPS, or
+`localhost`). A plain `http://<laptop-ip>:8080` URL works as a normal web page but
+will not be installable and will not cache offline.
+
+### 1. Serve the files
+
+```sh
+cd timer
+python3 -m http.server 8080
+# or, using the ./start script (Node + live-server, auto-reload)
+./start
+```
+
+### 2. Give your phone an HTTPS URL
+
+Either expose the local server through a tunnel, for example:
+
+```sh
+cloudflared tunnel --url http://localhost:8080
+# or: npx localtunnel --port 8080
+```
+
+or upload the folder as-is to any static host (GitHub Pages, Netlify, Cloudflare
+Pages, Vercel). There is nothing to compile.
+
+### 3. Install
+
+Open the HTTPS URL on the phone and use **Add to Home Screen** (Safari: Share
+menu; Chrome: banner or the ⋮ menu → *Install app*). It then launches fullscreen
+and works offline.
+
+### Audio notes
+
+- The bell and beeps are synthesised with the Web Audio API, so there are no sound
+  files to download and they work offline.
+- Audio is unlocked by the first tap on **Start**, as mobile browsers require.
+- On iOS the ringer/silent switch still mutes Web Audio playback — turn silent mode
+  off for a workout.
+
+## Tests
+
+With a server on `127.0.0.1:8765` and Chrome running with `--remote-debugging-port=9222`:
+
+```sh
+cd timer
+node tools/smoke_test.mjs
+```
+
+The test drives the real page and asserts the exact pause/training sequence for
+2 sets × 3 exercises, the grey→red colour switch, phase durations, the frozen clock
+while paused, reset/restart behaviour and settings persistence.
\ No newline at end of file
diff --git a/app.js b/app.js
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+(() => {
+  'use strict';
+
+  const STORAGE_KEY = 'interval-timer/v1';
+  const TICK_MS = 100;
+
+  const els = {
+    body: document.body,
+    stage: document.getElementById('stage'),
+    progress: document.getElementById('progress'),
+    phaseLabel: document.getElementById('phaseLabel'),
+    exerciseName: document.getElementById('exerciseName'),
+    clock: document.getElementById('clock'),
+    nextUp: document.getElementById('nextUp'),
+    startBtn: document.getElementById('startBtn'),
+    pauseBtn: document.getElementById('pauseBtn'),
+    resetBtn: document.getElementById('resetBtn'),
+    settingsToggle: document.getElementById('settingsToggle'),
+    settings: document.getElementById('settings'),
+    pauseInput: document.getElementById('pauseInput'),
+    workInput: document.getElementById('workInput'),
+    setsInput: document.getElementById('setsInput'),
+    exerciseList: document.getElementById('exerciseList'),
+    emptyHint: document.getElementById('emptyHint'),
+    exerciseInput: document.getElementById('exerciseInput'),
+    addBtn: document.getElementById('addBtn'),
+    installHint: document.getElementById('installHint'),
+  };
+
+  const DEFAULTS = { pauseSec: 15, workSec: 45, sets: 5, exercises: [] };
+
+  /* ------------------------------------------------------------------ *
+   * settings persistence
+   * ------------------------------------------------------------------ */
+
+  function loadSettings() {
+    try {
+      const raw = localStorage.getItem(STORAGE_KEY);
+      if (!raw) return { ...DEFAULTS };
+      const parsed = JSON.parse(raw);
+      return {
+        pauseSec: clampInt(parsed.pauseSec, 0, 3600, DEFAULTS.pauseSec),
+        workSec: clampInt(parsed.workSec, 1, 3600, DEFAULTS.workSec),
+        sets: clampInt(parsed.sets, 1, 999, DEFAULTS.sets),
+        exercises: Array.isArray(parsed.exercises)
+          ? parsed.exercises.filter((e) => typeof e === 'string' && e.trim()).map((e) => e.trim())
+          : [],
+      };
+    } catch {
+      return { ...DEFAULTS };
+    }
+  }
+
+  function saveSettings() {
+    try {
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(settings));
+    } catch {
+      /* storage unavailable (private mode) — the app still works in memory */
+    }
+  }
+
+  function clampInt(value, min, max, fallback) {
+    const n = Math.round(Number(value));
+    if (!Number.isFinite(n)) return fallback;
+    return Math.min(max, Math.max(min, n));
+  }
+
+  const settings = loadSettings();
+
+  /* ------------------------------------------------------------------ *
+   * runtime state
+   * ------------------------------------------------------------------ */
+
+  const run = {
+    phase: 'idle', // idle | pause | work | done
+    setIndex: 0,
+    exIndex: 0,
+    remaining: 0,
+    deadline: 0,
+    paused: false,
+    pausedRemaining: 0,
+    timerId: null,
+  };
+
+  const isActive = () => run.phase === 'pause' || run.phase === 'work';
+
+  /* ------------------------------------------------------------------ *
+   * audio — synthesised, so the app needs no sound files and works offline
+   * ------------------------------------------------------------------ */
+
+  let audioCtx = null;
+
+  function ensureAudio() {
+    try {
+      const Ctx = window.AudioContext || window.webkitAudioContext;
+      if (!Ctx) return null;
+      if (!audioCtx) audioCtx = new Ctx();
+      if (audioCtx.state === 'suspended') audioCtx.resume().catch(() => {});
+      return audioCtx;
+    } catch {
+      return null; // audio unavailable — the timer must still run
+    }
+  }
+
+  function tone(freq, delay, duration, peak, type) {
+    if (!ensureAudio()) return;
+    const ctx = audioCtx;
+    const t0 = ctx.currentTime + delay;
+    const osc = ctx.createOscillator();
+    const gain = ctx.createGain();
+    osc.type = type || 'sine';
+    osc.frequency.setValueAtTime(freq, t0);
+    gain.gain.setValueAtTime(0.0001, t0);
+    gain.gain.exponentialRampToValueAtTime(peak, t0 + 0.012);
+    gain.gain.exponentialRampToValueAtTime(0.0001, t0 + duration);
+    osc.connect(gain).connect(ctx.destination);
+    osc.start(t0);
+    osc.stop(t0 + duration + 0.05);
+  }
+
+  /** Bell: a few inharmonic partials with long decay. */
+  function bell(count) {
+    if (!ensureAudio()) return;
+    const rings = count || 1;
+    for (let i = 0; i < rings; i++) {
+      const at = i * 0.55;
+      tone(880, at, 1.6, 0.32, 'sine');
+      tone(1320, at, 1.1, 0.16, 'sine');
+      tone(1760, at, 0.7, 0.09, 'sine');
+      tone(587, at, 1.9, 0.12, 'sine');
+    }
+  }
+
+  /** Short beep marking a phase change. Higher = training, lower = pause. */
+  function beep(freq) {
+    if (!ensureAudio()) return;
+    tone(freq, 0, 0.16, 0.3, 'square');
+    tone(freq * 2, 0, 0.1, 0.08, 'sine');
+  }
+
+  function vibrate(pattern) {
+    if (navigator.vibrate) {
+      try { navigator.vibrate(pattern); } catch { /* ignore */ }
+    }
+  }
+
+  /* ------------------------------------------------------------------ *
+   * screen wake lock — keeps the phone display on during a session
+   * ------------------------------------------------------------------ */
+
+  let wakeLock = null;
+
+  async function requestWakeLock() {
+    if (!('wakeLock' in navigator)) return;
+    try {
+      wakeLock = await navigator.wakeLock.request('screen');
+      wakeLock.addEventListener('release', () => { wakeLock = null; });
+    } catch {
+      /* denied or unsupported — not fatal */
+    }
+  }
+
+  function releaseWakeLock() {
+    if (wakeLock) {
+      wakeLock.release().catch(() => {});
+      wakeLock = null;
+    }
+  }
+
+  /* ------------------------------------------------------------------ *
+   * timer engine — phases chain off their own deadline, so a throttled or
+   * suspended page catches up to real elapsed time instead of drifting
+   * ------------------------------------------------------------------ */
+
+  const MAX_CATCHUP = 5000;
+
+  function startTimer() {
+    if (run.timerId !== null) return;
+    run.timerId = window.setInterval(tick, TICK_MS);
+  }
+
+  function stopTimer() {
+    if (run.timerId !== null) {
+      window.clearInterval(run.timerId);
+      run.timerId = null;
+    }
+  }
+
+  function tick() {
+    if (!isActive() || run.paused) return;
+
+    const now = performance.now();
+    const late = now - run.deadline;
+
+    if (late < 0) {
+      run.remaining = -late / 1000;
+      render();
+      return;
+    }
+
+    // One or more phases ended while we were not ticking (timer throttling).
+    // Play the cue only for a prompt transition, not for a bulk catch-up.
+    let steps = 0;
+    while (isActive() && !run.paused && run.deadline <= now && steps < MAX_CATCHUP) {
+      advance(steps === 0 && late < 1500);
+      steps++;
+    }
+
+    if (!isActive()) return;
+    run.remaining = Math.max(0, (run.deadline - now) / 1000);
+    render();
+  }
+
+  /** `from` anchors the new phase to the previous phase's deadline. */
+  function beginPhase(phase, from) {
+    run.phase = phase;
+    const duration = phase === 'pause' ? settings.pauseSec : settings.workSec;
+    run.remaining = duration;
+    run.deadline = (from === undefined ? performance.now() : from) + duration * 1000;
+    render();
+  }
+
+  function advance(playSound) {
+    if (run.phase === 'pause') {
+      // pause finished -> training starts, text turns red
+      if (playSound) { beep(1180); vibrate(140); }
+      beginPhase('work', run.deadline);
+      return;
+    }
+
+    if (run.phase === 'work') {
+      // training finished -> line up the next exercise
+      const from = run.deadline;
+      run.exIndex += 1;
+      if (run.exIndex >= settings.exercises.length) {
+        run.exIndex = 0;
+        run.setIndex += 1;
+      }
+      if (run.setIndex >= settings.sets) {
+        finish();
+        return;
+      }
+      if (playSound) { beep(720); vibrate(140); }
+      beginPhase('pause', from);
+    }
+  }
+
+  function start() {
+    if (settings.exercises.length === 0) {
+      openSettings();
+      els.exerciseInput.focus();
+      return;
+    }
+    ensureAudio(); // must happen inside the user gesture
+    run.setIndex = 0;
+    run.exIndex = 0;
+    run.paused = false;
+    run.pausedRemaining = 0;
+    bell(1);
+    vibrate(300);
+    requestWakeLock();
+    startTimer();
+    beginPhase('pause');
+  }
+
+  function togglePause() {
+    if (!isActive()) return;
+    if (run.paused) {
+      run.paused = false;
+      run.deadline = performance.now() + run.pausedRemaining * 1000;
+    } else {
+      run.paused = true;
+      run.pausedRemaining = Math.max(0, (run.deadline - performance.now()) / 1000);
+    }
+    render();
+  }
+
+  function finish() {
+    run.phase = 'done';
+    run.remaining = 0;
+    run.paused = false;
+    stopTimer();
+    releaseWakeLock();
+    bell(3);
+    vibrate([250, 120, 250, 120, 500]);
+    render();
+  }
+
+  function reset() {
+    run.phase = 'idle';
+    run.setIndex = 0;
+    run.exIndex = 0;
+    run.remaining = 0;
+    run.paused = false;
+    run.pausedRemaining = 0;
+    stopTimer();
+    releaseWakeLock();
+    render();
+  }
+
+  /* ------------------------------------------------------------------ *
+   * rendering
+   * ------------------------------------------------------------------ */
+
+  function formatTime(seconds) {
+    const total = Math.max(0, Math.ceil(seconds));
+    const m = Math.floor(total / 60);
+    const s = total % 60;
+    return `${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
+  }
+
+  function nextExerciseAfterWork() {
+    let ex = run.exIndex + 1;
+    let set = run.setIndex;
+    if (ex >= settings.exercises.length) {
+      ex = 0;
+      set += 1;
+    }
+    if (set >= settings.sets) return null;
+    return settings.exercises[ex];
+  }
+
+  function render() {
+    const total = settings.exercises.length;
+    const current = total ? settings.exercises[run.exIndex] : null;
+
+    els.body.classList.toggle('phase-work', run.phase === 'work');
+    els.body.classList.toggle('phase-done', run.phase === 'done');
+    els.body.classList.toggle('phase-paused', run.paused);
+
+    if (run.phase === 'idle') {
+      els.progress.textContent = total
+        ? `${settings.sets} set${settings.sets === 1 ? '' : 's'} · ${total} exercise${total === 1 ? '' : 's'}`
+        : '';
+      els.phaseLabel.textContent = 'Ready';
+      els.exerciseName.textContent = current || 'Add your exercises';
+      els.clock.textContent = formatTime(settings.pauseSec);
+      els.nextUp.textContent = total
+        ? `Pause ${settings.pauseSec}s, then ${settings.workSec}s training`
+        : '';
+    } else if (run.phase === 'done') {
+      els.progress.textContent = 'Complete';
+      els.phaseLabel.textContent = 'Done';
+      els.exerciseName.textContent = 'Workout complete';
+      els.clock.textContent = '00:00';
+      els.nextUp.textContent = `${settings.sets} set${settings.sets === 1 ? '' : 's'} finished`;
+    } else {
+      els.progress.textContent =
+        `Set ${run.setIndex + 1} / ${settings.sets} · Exercise ${run.exIndex + 1} / ${total}`;
+      els.phaseLabel.textContent = run.paused
+        ? 'Paused'
+        : run.phase === 'work' ? 'Training' : 'Pause';
+      els.exerciseName.textContent = current || '';
+      els.clock.textContent = formatTime(run.remaining);
+
+      if (run.phase === 'pause') {
+        els.nextUp.textContent = `Next: ${settings.workSec}s training`;
+      } else {
+        const next = nextExerciseAfterWork();
+        els.nextUp.textContent = next ? `Next: ${next}` : 'Last one — finish strong';
+      }
+    }
+
+    renderControls();
+  }
+
+  function renderControls() {
+    const active = isActive();
+    els.startBtn.hidden = active;
+    els.startBtn.textContent = run.phase === 'done' ? 'Restart' : 'Start';
+    els.pauseBtn.hidden = !active;
+    els.pauseBtn.textContent = run.paused ? 'Resume' : 'Pause';
+    els.resetBtn.hidden = !active && run.phase !== 'done';
+
+    const lock = active;
+    els.pauseInput.disabled = lock;
+    els.workInput.disabled = lock;
+    els.setsInput.disabled = lock;
+    els.exerciseInput.disabled = lock;
+    els.addBtn.disabled = lock;
+    els.exerciseList.querySelectorAll('button').forEach((b) => { b.disabled = lock; });
+  }
+
+  function renderExerciseList() {
+    els.exerciseList.textContent = '';
+    settings.exercises.forEach((name, i) => {
+      const li = document.createElement('li');
+
+      const idx = document.createElement('span');
+      idx.className = 'idx';
+      idx.textContent = `${i + 1}.`;
+
+      const label = document.createElement('span');
+      label.className = 'name';
+      label.textContent = name;
+
+      const remove = document.createElement('button');
+      remove.type = 'button';
+      remove.className = 'remove-btn';
+      remove.textContent = '\u00d7';
+      remove.setAttribute('aria-label', `Remove ${name}`);
+      remove.addEventListener('click', () => {
+        settings.exercises.splice(i, 1);
+        saveSettings();
+        renderExerciseList();
+        render();
+      });
+
+      li.append(idx, label, remove);
+      els.exerciseList.append(li);
+    });
+
+    els.emptyHint.hidden = settings.exercises.length > 0;
+    renderControls();
+  }
+
+  /* ------------------------------------------------------------------ *
+   * settings UI
+   * ------------------------------------------------------------------ */
+
+  function openSettings() {
+    els.settings.hidden = false;
+    els.settingsToggle.setAttribute('aria-expanded', 'true');
+  }
+
+  function toggleSettings() {
+    const open = els.settings.hidden;
+    els.settings.hidden = !open;
+    els.settingsToggle.setAttribute('aria-expanded', String(open));
+  }
+
+  function addExercise() {
+    const name = els.exerciseInput.value.trim();
+    if (!name) return;
+    settings.exercises.push(name);
+    saveSettings();
+    els.exerciseInput.value = '';
+    renderExerciseList();
+    render();
+    els.exerciseInput.focus();
+  }
+
+  function bindNumberInput(input, key, min, max) {
+    input.value = String(settings[key]);
+    input.addEventListener('change', () => {
+      settings[key] = clampInt(input.value, min, max, DEFAULTS[key]);
+      input.value = String(settings[key]);
+      saveSettings();
+      render();
+    });
+  }
+
+  /* ------------------------------------------------------------------ *
+   * wiring
+   * ------------------------------------------------------------------ */
+
+  bindNumberInput(els.pauseInput, 'pauseSec', 0, 3600);
+  bindNumberInput(els.workInput, 'workSec', 1, 3600);
+  bindNumberInput(els.setsInput, 'sets', 1, 999);
+
+  els.startBtn.addEventListener('click', start);
+  els.pauseBtn.addEventListener('click', togglePause);
+  els.resetBtn.addEventListener('click', reset);
+  els.settingsToggle.addEventListener('click', toggleSettings);
+  els.addBtn.addEventListener('click', addExercise);
+  els.exerciseInput.addEventListener('keydown', (e) => {
+    if (e.key === 'Enter') {
+      e.preventDefault();
+      addExercise();
+    }
+  });
+
+  document.addEventListener('visibilitychange', () => {
+    if (document.visibilityState === 'visible') {
+      if (isActive() && !run.paused) tick();
+      if (isActive() && !wakeLock) requestWakeLock();
+    }
+  });
+
+  // space bar toggles pause on desktop
+  document.addEventListener('keydown', (e) => {
+    if (e.code === 'Space' && isActive() && e.target.tagName !== 'INPUT') {
+      e.preventDefault();
+      togglePause();
+    }
+  });
+
+  renderExerciseList();
+  render();
+
+  /* ------------------------------------------------------------------ *
+   * PWA: service worker + install prompt
+   * ------------------------------------------------------------------ */
+
+  if ('serviceWorker' in navigator) {
+    window.addEventListener('load', () => {
+      navigator.serviceWorker.register('./sw.js').catch(() => {});
+    });
+  }
+
+  let deferredPrompt = null;
+  window.addEventListener('beforeinstallprompt', (e) => {
+    e.preventDefault();
+    deferredPrompt = e;
+    const btn = document.createElement('button');
+    btn.type = 'button';
+    btn.className = 'btn';
+    btn.textContent = 'Install app';
+    btn.addEventListener('click', async () => {
+      if (!deferredPrompt) return;
+      deferredPrompt.prompt();
+      await deferredPrompt.userChoice;
+      deferredPrompt = null;
+      els.installHint.textContent = '';
+    });
+    els.installHint.textContent = '';
+    els.installHint.append(btn);
+  });
+})();
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diff --git a/index.html b/index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
+<meta name="theme-color" content="#0e0e11" />
+<meta name="description" content="Interval training timer with pause and work phases." />
+<meta name="apple-mobile-web-app-capable" content="yes" />
+<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
+<meta name="apple-mobile-web-app-title" content="Timer" />
+<link rel="manifest" href="./manifest.webmanifest" />
+<link rel="apple-touch-icon" href="./icons/icon-192.png" />
+<link rel="icon" href="./icons/icon-192.png" />
+<link rel="stylesheet" href="./styles.css" />
+<title>Interval Timer</title>
+</head>
+<body>
+
+<header class="topbar">
+  <h1>Interval Timer</h1>
+  <button id="settingsToggle" class="icon-btn" type="button" aria-expanded="false" aria-controls="settings" aria-label="Settings">
+    <svg viewBox="0 0 24 24" width="24" height="24" aria-hidden="true">
+      <path fill="currentColor" d="M12 8a4 4 0 1 0 0 8 4 4 0 0 0 0-8Zm0 6a2 2 0 1 1 0-4 2 2 0 0 1 0 4Z"/>
+      <path fill="currentColor" d="m19.4 13-.2-1 .2-1 1.6-1.2-1.6-2.8-1.9.7-1.7-1-.3-2h-3.2l-.3 2-1.7 1-1.9-.7-1.6 2.8L8.8 11l-.2 1 .2 1-1.6 1.2 1.6 2.8 1.9-.7 1.7 1 .3 2h3.2l.3-2 1.7-1 1.9.7 1.6-2.8L19.4 13Zm-2.1 3.2-1.3-.5-2.6 1.5-.2 1.4h-1.6l-.2-1.4-2.6-1.5-1.3.5-.8-1.4 1.1-.9v-3l-1.1-.9.8-1.4 1.3.5 2.6-1.5.2-1.4h1.6l.2 1.4 2.6 1.5 1.3-.5.8 1.4-1.1.9v3l1.1.9-.8 1.4Z"/>
+    </svg>
+  </button>
+</header>
+
+<main class="stage" id="stage">
+  <div class="progress" id="progress"></div>
+
+  <div class="phase-label" id="phaseLabel">Ready</div>
+
+  <div class="exercise" id="exerciseName">Add your exercises</div>
+
+  <div class="clock" id="clock">00:00</div>
+
+  <div class="next" id="nextUp"></div>
+</main>
+
+<div class="controls" id="controls">
+  <button id="startBtn" class="btn btn-primary" type="button">Start</button>
+  <button id="pauseBtn" class="btn" type="button" hidden>Pause</button>
+  <button id="resetBtn" class="btn" type="button" hidden>Reset</button>
+</div>
+
+<section class="settings" id="settings" hidden>
+  <div class="field-row">
+    <label class="field">
+      <span>Pause (seconds)</span>
+      <input id="pauseInput" type="number" inputmode="numeric" min="0" step="1" value="15" />
+    </label>
+    <label class="field">
+      <span>Training (seconds)</span>
+      <input id="workInput" type="number" inputmode="numeric" min="1" step="1" value="45" />
+    </label>
+    <label class="field">
+      <span>Sets</span>
+      <input id="setsInput" type="number" inputmode="numeric" min="1" step="1" value="5" />
+    </label>
+  </div>
+
+  <h2 class="section-title">Exercises</h2>
+  <ul class="exercise-list" id="exerciseList"></ul>
+  <p class="empty-hint" id="emptyHint">No exercises yet. Add one below.</p>
+
+  <div class="add-row">
+    <input id="exerciseInput" type="text" placeholder="Exercise name" autocomplete="off" enterkeyhint="done" />
+    <button id="addBtn" class="btn btn-add" type="button" aria-label="Add exercise">+</button>
+  </div>
+
+  <p class="hint">Order: for every set, each exercise runs a pause first, then the training period.</p>
+</section>
+
+<footer class="footer">
+  <span id="installHint"></span>
+</footer>
+
+<script src="./app.js"></script>
+</body>
+</html>
diff --git a/manifest.webmanifest b/manifest.webmanifest
new file mode 100644
index 0000000..6bb6444
--- /dev/null
+++ b/manifest.webmanifest
@@ -0,0 +1,32 @@
+{
+  "name": "Interval Timer",
+  "short_name": "Timer",
+  "description": "Interval training timer: pause, training, sets and exercises.",
+  "start_url": "./",
+  "scope": "./",
+  "display": "standalone",
+  "orientation": "portrait",
+  "background_color": "#0e0e11",
+  "theme_color": "#0e0e11",
+  "categories": ["health", "fitness", "sports"],
+  "icons": [
+    {
+      "src": "./icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "./icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "./icons/icon-maskable-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
+}
diff --git a/start b/start
new file mode 100755
index 0000000..a1db1d4
--- /dev/null
+++ b/start
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+
+#!/bin/bash
+
+# Simple static file server with live reload
+# Requires Node.js and live-server
+
+# Check if live-server is installed
+if ! command -v live-server &> /dev/null
+then
+    echo "Installing live-server..."
+    npm install -g live-server
+fi
+
+# Serve the current directory with auto-reload
+echo "Starting live-server on http://localhost:8080 ..."
+live-server .
+
+
+
diff --git a/styles.css b/styles.css
new file mode 100644
index 0000000..b9e460e
--- /dev/null
+++ b/styles.css
@@ -0,0 +1,330 @@
+:root {
+  --bg: #0e0e11;
+  --bg-soft: #17171c;
+  --bg-input: #202027;
+  --line: #2c2c35;
+  --text: #f2f2f5;
+  --muted: #8b8b96;
+  --pause: #8b8b96;
+  --work: #ff3b30;
+  --accent: #4c8dff;
+  --radius: 14px;
+}
+
+* { box-sizing: border-box; }
+
+html, body {
+  margin: 0;
+  padding: 0;
+  height: 100%;
+}
+
+body {
+  background: var(--bg);
+  color: var(--text);
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+  display: flex;
+  flex-direction: column;
+  min-height: 100dvh;
+  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
+  -webkit-tap-highlight-color: transparent;
+  overscroll-behavior: none;
+}
+
+/* ---------- top bar ---------- */
+
+.topbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 14px 18px 6px;
+}
+
+.topbar h1 {
+  font-size: 1rem;
+  font-weight: 600;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  color: var(--muted);
+  margin: 0;
+}
+
+.icon-btn {
+  background: none;
+  border: 0;
+  color: var(--muted);
+  padding: 8px;
+  border-radius: 10px;
+  display: grid;
+  place-items: center;
+  cursor: pointer;
+}
+
+.icon-btn:active { background: var(--bg-soft); }
+.icon-btn[aria-expanded="true"] { color: var(--text); }
+
+/* ---------- stage ---------- */
+
+.stage {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+  padding: 8px 20px;
+  gap: 6px;
+  min-height: 0;
+}
+
+.progress {
+  font-size: 0.85rem;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  color: var(--muted);
+  min-height: 1.2em;
+}
+
+.phase-label {
+  font-size: 0.95rem;
+  letter-spacing: 0.14em;
+  text-transform: uppercase;
+  font-weight: 700;
+  color: var(--muted);
+  transition: color 0.2s ease;
+}
+
+.exercise {
+  font-size: clamp(1.8rem, 9vw, 3.2rem);
+  font-weight: 700;
+  line-height: 1.15;
+  color: var(--pause);
+  transition: color 0.2s ease;
+  overflow-wrap: anywhere;
+  max-width: 100%;
+}
+
+.clock {
+  font-size: clamp(3.4rem, 22vw, 7rem);
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  line-height: 1;
+  letter-spacing: -0.02em;
+  color: var(--pause);
+  transition: color 0.2s ease;
+}
+
+.next {
+  font-size: 0.9rem;
+  color: var(--muted);
+  min-height: 1.3em;
+}
+
+/* phase colours: grey while pausing, red while training */
+
+body.phase-work .exercise,
+body.phase-work .clock,
+body.phase-work .phase-label {
+  color: var(--work);
+}
+
+body.phase-done .exercise,
+body.phase-done .clock,
+body.phase-done .phase-label {
+  color: var(--accent);
+}
+
+body.phase-paused .clock { opacity: 0.45; }
+
+/* ---------- controls ---------- */
+
+.controls {
+  display: flex;
+  gap: 12px;
+  padding: 10px 18px 18px;
+}
+
+.btn {
+  flex: 1;
+  appearance: none;
+  border: 1px solid var(--line);
+  background: var(--bg-soft);
+  color: var(--text);
+  font-size: 1.05rem;
+  font-weight: 600;
+  padding: 16px 18px;
+  border-radius: var(--radius);
+  cursor: pointer;
+  touch-action: manipulation;
+}
+
+.btn:active { transform: scale(0.985); }
+
+.btn-primary {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #fff;
+}
+
+.btn-primary:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
+
+/* ---------- settings ---------- */
+
+.settings {
+  background: var(--bg-soft);
+  border-top: 1px solid var(--line);
+  padding: 18px;
+  max-height: 62dvh;
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+}
+
+.field-row {
+  display: flex;
+  gap: 10px;
+}
+
+.field {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  min-width: 0;
+}
+
+.field span {
+  font-size: 0.75rem;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  color: var(--muted);
+}
+
+input[type="number"],
+input[type="text"] {
+  width: 100%;
+  background: var(--bg-input);
+  border: 1px solid var(--line);
+  border-radius: 10px;
+  color: var(--text);
+  font-size: 1.05rem;
+  padding: 12px;
+  font-family: inherit;
+}
+
+input:focus {
+  outline: none;
+  border-color: var(--accent);
+}
+
+.section-title {
+  font-size: 0.75rem;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  color: var(--muted);
+  margin: 22px 0 8px;
+}
+
+.exercise-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.exercise-list li {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  background: var(--bg-input);
+  border: 1px solid var(--line);
+  border-radius: 10px;
+  padding: 10px 10px 10px 14px;
+}
+
+.exercise-list .idx {
+  color: var(--muted);
+  font-size: 0.85rem;
+  font-variant-numeric: tabular-nums;
+  min-width: 1.4em;
+}
+
+.exercise-list .name {
+  flex: 1;
+  overflow-wrap: anywhere;
+}
+
+.remove-btn {
+  background: none;
+  border: 0;
+  color: var(--muted);
+  font-size: 1.3rem;
+  line-height: 1;
+  padding: 6px 10px;
+  border-radius: 8px;
+  cursor: pointer;
+}
+
+.remove-btn:active { background: #2c2c35; color: var(--work); }
+
+.empty-hint {
+  color: var(--muted);
+  font-size: 0.9rem;
+  margin: 4px 0 12px;
+}
+
+.add-row {
+  display: flex;
+  gap: 10px;
+  margin-top: 12px;
+}
+
+.add-row input { flex: 1; }
+
+.btn-add {
+  flex: 0 0 auto;
+  width: 56px;
+  font-size: 1.6rem;
+  line-height: 1;
+  padding: 8px;
+  background: var(--accent);
+  border-color: var(--accent);
+  color: #fff;
+}
+
+.hint {
+  color: var(--muted);
+  font-size: 0.8rem;
+  line-height: 1.5;
+  margin: 16px 0 0;
+}
+
+/* ---------- footer ---------- */
+
+.footer {
+  padding: 0 18px 10px;
+  font-size: 0.75rem;
+  color: var(--muted);
+  text-align: center;
+  min-height: 1em;
+}
+
+.footer .btn {
+  flex: none;
+  width: auto;
+  display: inline-block;
+  padding: 10px 18px;
+  font-size: 0.85rem;
+}
+
+/* keep the clock readable on short landscape screens */
+@media (max-height: 520px) {
+  .clock { font-size: clamp(2.4rem, 14vh, 4rem); }
+  .exercise { font-size: clamp(1.3rem, 5vh, 2rem); }
+  .stage { gap: 2px; }
+}
diff --git a/sw.js b/sw.js
new file mode 100644
index 0000000..7fda59c
--- /dev/null
+++ b/sw.js
@@ -0,0 +1,65 @@
+/* Offline app shell for the Interval Timer PWA. */
+
+const CACHE = 'interval-timer-v1';
+
+const ASSETS = [
+  './',
+  './index.html',
+  './styles.css',
+  './app.js',
+  './manifest.webmanifest',
+  './icons/icon-192.png',
+  './icons/icon-512.png',
+  './icons/icon-maskable-512.png',
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE)
+      .then((cache) => cache.addAll(ASSETS))
+      .then(() => self.skipWaiting())
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys()
+      .then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
+      .then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  const { request } = event;
+  if (request.method !== 'GET' || new URL(request.url).origin !== self.location.origin) return;
+
+  // Navigations: try the network, fall back to the cached shell when offline.
+  if (request.mode === 'navigate') {
+    event.respondWith(
+      fetch(request)
+        .then((response) => {
+          const copy = response.clone();
+          caches.open(CACHE).then((cache) => cache.put('./index.html', copy));
+          return response;
+        })
+        .catch(() => caches.match('./index.html'))
+    );
+    return;
+  }
+
+  // Everything else: cache first, refresh in the background.
+  event.respondWith(
+    caches.match(request).then((cached) => {
+      const network = fetch(request)
+        .then((response) => {
+          if (response && response.status === 200 && response.type === 'basic') {
+            const copy = response.clone();
+            caches.open(CACHE).then((cache) => cache.put(request, copy));
+          }
+          return response;
+        })
+        .catch(() => cached);
+      return cached || network;
+    })
+  );
+});
diff --git a/tmp-ff-app.png b/tmp-ff-app.png
new file mode 100644
index 0000000..11338e8
Binary files /dev/null and b/tmp-ff-app.png differ
diff --git a/tmp-ffprof/.parentlock b/tmp-ffprof/.parentlock
new file mode 100644
index 0000000..e69de29
diff --git a/tmp-ffprof/SiteSecurityServiceState.bin b/tmp-ffprof/SiteSecurityServiceState.bin
new file mode 100644
index 0000000..833ede2
Binary files /dev/null and b/tmp-ffprof/SiteSecurityServiceState.bin differ
diff --git a/tmp-ffprof/addonStartup.json.lz4 b/tmp-ffprof/addonStartup.json.lz4
new file mode 100644
index 0000000..9b8264f
Binary files /dev/null and b/tmp-ffprof/addonStartup.json.lz4 differ
diff --git a/tmp-ffprof/addons.json b/tmp-ffprof/addons.json
new file mode 100644
index 0000000..bec320e
--- /dev/null
+++ b/tmp-ffprof/addons.json
@@ -0,0 +1 @@
+{"schema":6,"addons":[{"id":"langpack-de@firefox.mozilla.org","icons":{"32":"https://addons.mozilla.org/static-server/img/addon-icons/default-32.png","64":"https://addons.mozilla.org/static-server/img/addon-icons/default-64.png","128":"https://addons.mozilla.org/static-server/img/addon-icons/default-128.png"},"name":"Deutsch (DE) Language Pack","version":"157.0.20260918.91356","sourceURI":"https://addons.mozilla.org/firefox/downloads/file/5039501/deutsch_de_language_pack-157.0.20260918.91356.xpi","homepageURL":null,"supportURL":null,"amoListingURL":"https://addons.mozilla.org/de/firefox/addon/deutsch-de-language-pack/","description":"Deutsch (DE) Language Pack","fullDescription":null,"weeklyDownloads":1045,"type":"locale","creator":{"name":"Firefox","url":"https://addons.mozilla.org/de/firefox/user/4757633/"},"developers":[],"screenshots":[],"contributionURL":"","averageRating":4.1419,"reviewCount":280,"reviewURL":"https://addons.mozilla.org/de/firefox/addon/deutsch-de-language-pack/reviews/","updateDate":1789737511000}]}
\ No newline at end of file
diff --git a/tmp-ffprof/bounce-tracking-protection.sqlite b/tmp-ffprof/bounce-tracking-protection.sqlite
new file mode 100644
index 0000000..33faebe
Binary files /dev/null and b/tmp-ffprof/bounce-tracking-protection.sqlite differ
diff --git a/tmp-ffprof/cache2/entries/2E3BB6BC391F71592ABB479526FC18EF6BFAED2C b/tmp-ffprof/cache2/entries/2E3BB6BC391F71592ABB479526FC18EF6BFAED2C
new file mode 100644
index 0000000..2a7e140
Binary files /dev/null and b/tmp-ffprof/cache2/entries/2E3BB6BC391F71592ABB479526FC18EF6BFAED2C differ
diff --git a/tmp-ffprof/cache2/entries/31B882D8B33FAF0FE8062511BABE3B31700FD00D b/tmp-ffprof/cache2/entries/31B882D8B33FAF0FE8062511BABE3B31700FD00D
new file mode 100644
index 0000000..e343306
--- /dev/null
+++ b/tmp-ffprof/cache2/entries/31B882D8B33FAF0FE8062511BABE3B31700FD00D
@@ -0,0 +1,532 @@
+(() => {
+  'use strict';
+
+  const STORAGE_KEY = 'interval-timer/v1';
+  const TICK_MS = 100;
+
+  const els = {
+    body: document.body,
+    stage: document.getElementById('stage'),
+    progress: document.getElementById('progress'),
+    phaseLabel: document.getElementById('phaseLabel'),
+    exerciseName: document.getElementById('exerciseName'),
+    clock: document.getElementById('clock'),
+    nextUp: document.getElementById('nextUp'),
+    startBtn: document.getElementById('startBtn'),
+    pauseBtn: document.getElementById('pauseBtn'),
+    resetBtn: document.getElementById('resetBtn'),
+    settingsToggle: document.getElementById('settingsToggle'),
+    settings: document.getElementById('settings'),
+    pauseInput: document.getElementById('pauseInput'),
+    workInput: document.getElementById('workInput'),
+    setsInput: document.getElementById('setsInput'),
+    exerciseList: document.getElementById('exerciseList'),
+    emptyHint: document.getElementById('emptyHint'),
+    exerciseInput: document.getElementById('exerciseInput'),
+    addBtn: document.getElementById('addBtn'),
+    installHint: document.getElementById('installHint'),
+  };
+
+  const DEFAULTS = { pauseSec: 15, workSec: 45, sets: 5, exercises: [] };
+
+  /* ------------------------------------------------------------------ *
+   * settings persistence
+   * ------------------------------------------------------------------ */
+
+  function loadSettings() {
+    try {
+      const raw = localStorage.getItem(STORAGE_KEY);
+      if (!raw) return { ...DEFAULTS };
+      const parsed = JSON.parse(raw);
+      return {
+        pauseSec: clampInt(parsed.pauseSec, 0, 3600, DEFAULTS.pauseSec),
+        workSec: clampInt(parsed.workSec, 1, 3600, DEFAULTS.workSec),
+        sets: clampInt(parsed.sets, 1, 999, DEFAULTS.sets),
+        exercises: Array.isArray(parsed.exercises)
+          ? parsed.exercises.filter((e) => typeof e === 'string' && e.trim()).map((e) => e.trim())
+          : [],
+      };
+    } catch {
+      return { ...DEFAULTS };
+    }
+  }
+
+  function saveSettings() {
+    try {
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(settings));
+    } catch {
+      /* storage unavailable (private mode) — the app still works in memory */
+    }
+  }
+
+  function clampInt(value, min, max, fallback) {
+    const n = Math.round(Number(value));
+    if (!Number.isFinite(n)) return fallback;
+    return Math.min(max, Math.max(min, n));
+  }
+
+  const settings = loadSettings();
+
+  /* ------------------------------------------------------------------ *
+   * runtime state
+   * ------------------------------------------------------------------ */
+
+  const run = {
+    phase: 'idle', // idle | pause | work | done
+    setIndex: 0,
+    exIndex: 0,
+    remaining: 0,
+    deadline: 0,
+    paused: false,
+    pausedRemaining: 0,
+    timerId: null,
+  };
+
+  const isActive = () => run.phase === 'pause' || run.phase === 'work';
+
+  /* ------------------------------------------------------------------ *
+   * audio — synthesised, so the app needs no sound files and works offline
+   * ------------------------------------------------------------------ */
+
+  let audioCtx = null;
+
+  function ensureAudio() {
+    try {
+      const Ctx = window.AudioContext || window.webkitAudioContext;
+      if (!Ctx) return null;
+      if (!audioCtx) audioCtx = new Ctx();
+      if (audioCtx.state === 'suspended') audioCtx.resume().catch(() => {});
+      return audioCtx;
+    } catch {
+      return null; // audio unavailable — the timer must still run
+    }
+  }
+
+  function tone(freq, delay, duration, peak, type) {
+    if (!ensureAudio()) return;
+    const ctx = audioCtx;
+    const t0 = ctx.currentTime + delay;
+    const osc = ctx.createOscillator();
+    const gain = ctx.createGain();
+    osc.type = type || 'sine';
+    osc.frequency.setValueAtTime(freq, t0);
+    gain.gain.setValueAtTime(0.0001, t0);
+    gain.gain.exponentialRampToValueAtTime(peak, t0 + 0.012);
+    gain.gain.exponentialRampToValueAtTime(0.0001, t0 + duration);
+    osc.connect(gain).connect(ctx.destination);
+    osc.start(t0);
+    osc.stop(t0 + duration + 0.05);
+  }
+
+  /** Bell: a few inharmonic partials with long decay. */
+  function bell(count) {
+    if (!ensureAudio()) return;
+    const rings = count || 1;
+    for (let i = 0; i < rings; i++) {
+      const at = i * 0.55;
+      tone(880, at, 1.6, 0.32, 'sine');
+      tone(1320, at, 1.1, 0.16, 'sine');
+      tone(1760, at, 0.7, 0.09, 'sine');
+      tone(587, at, 1.9, 0.12, 'sine');
+    }
+  }
+
+  /** Short beep marking a phase change. Higher = training, lower = pause. */
+  function beep(freq) {
+    if (!ensureAudio()) return;
+    tone(freq, 0, 0.16, 0.3, 'square');
+    tone(freq * 2, 0, 0.1, 0.08, 'sine');
+  }
+
+  function vibrate(pattern) {
+    if (navigator.vibrate) {
+      try { navigator.vibrate(pattern); } catch { /* ignore */ }
+    }
+  }
+
+  /* ------------------------------------------------------------------ *
+   * screen wake lock — keeps the phone display on during a session
+   * ------------------------------------------------------------------ */
+
+  let wakeLock = null;
+
+  async function requestWakeLock() {
+    if (!('wakeLock' in navigator)) return;
+    try {
+      wakeLock = await navigator.wakeLock.request('screen');
+      wakeLock.addEventListener('release', () => { wakeLock = null; });
+    } catch {
+      /* denied or unsupported — not fatal */
+    }
+  }
+
+  function releaseWakeLock() {
+    if (wakeLock) {
+      wakeLock.release().catch(() => {});
+      wakeLock = null;
+    }
+  }
+
+  /* ------------------------------------------------------------------ *
+   * timer engine — phases chain off their own deadline, so a throttled or
+   * suspended page catches up to real elapsed time instead of drifting
+   * ------------------------------------------------------------------ */
+
+  const MAX_CATCHUP = 5000;
+
+  function startTimer() {
+    if (run.timerId !== null) return;
+    run.timerId = window.setInterval(tick, TICK_MS);
+  }
+
+  function stopTimer() {
+    if (run.timerId !== null) {
+      window.clearInterval(run.timerId);
+      run.timerId = null;
+    }
+  }
+
+  function tick() {
+    if (!isActive() || run.paused) return;
+
+    const now = performance.now();
+    const late = now - run.deadline;
+
+    if (late < 0) {
+      run.remaining = -late / 1000;
+      render();
+      return;
+    }
+
+    // One or more phases ended while we were not ticking (timer throttling).
+    // Play the cue only for a prompt transition, not for a bulk catch-up.
+    let steps = 0;
+    while (isActive() && !run.paused && run.deadline <= now && steps < MAX_CATCHUP) {
+      advance(steps === 0 && late < 1500);
+      steps++;
+    }
+
+    if (!isActive()) return;
+    run.remaining = Math.max(0, (run.deadline - now) / 1000);
+    render();
+  }
+
+  /** `from` anchors the new phase to the previous phase's deadline. */
+  function beginPhase(phase, from) {
+    run.phase = phase;
+    const duration = phase === 'pause' ? settings.pauseSec : settings.workSec;
+    run.remaining = duration;
+    run.deadline = (from === undefined ? performance.now() : from) + duration * 1000;
+    render();
+  }
+
+  function advance(playSound) {
+    if (run.phase === 'pause') {
+      // pause finished -> training starts, text turns red
+      if (playSound) { beep(1180); vibrate(140); }
+      beginPhase('work', run.deadline);
+      return;
+    }
+
+    if (run.phase === 'work') {
+      // training finished -> line up the next exercise
+      const from = run.deadline;
+      run.exIndex += 1;
+      if (run.exIndex >= settings.exercises.length) {
+        run.exIndex = 0;
+        run.setIndex += 1;
+      }
+      if (run.setIndex >= settings.sets) {
+        finish();
+        return;
+      }
+      if (playSound) { beep(720); vibrate(140); }
+      beginPhase('pause', from);
+    }
+  }
+
+  function start() {
+    if (settings.exercises.length === 0) {
+      openSettings();
+      els.exerciseInput.focus();
+      return;
+    }
+    ensureAudio(); // must happen inside the user gesture
+    run.setIndex = 0;
+    run.exIndex = 0;
+    run.paused = false;
+    run.pausedRemaining = 0;
+    bell(1);
+    vibrate(300);
+    requestWakeLock();
+    startTimer();
+    beginPhase('pause');
+  }
+
+  function togglePause() {
+    if (!isActive()) return;
+    if (run.paused) {
+      run.paused = false;
+      run.deadline = performance.now() + run.pausedRemaining * 1000;
+    } else {
+      run.paused = true;
+      run.pausedRemaining = Math.max(0, (run.deadline - performance.now()) / 1000);
+    }
+    render();
+  }
+
+  function finish() {
+    run.phase = 'done';
+    run.remaining = 0;
+    run.paused = false;
+    stopTimer();
+    releaseWakeLock();
+    bell(3);
+    vibrate([250, 120, 250, 120, 500]);
+    render();
+  }
+
+  function reset() {
+    run.phase = 'idle';
+    run.setIndex = 0;
+    run.exIndex = 0;
+    run.remaining = 0;
+    run.paused = false;
+    run.pausedRemaining = 0;
+    stopTimer();
+    releaseWakeLock();
+    render();
+  }
+
+  /* ------------------------------------------------------------------ *
+   * rendering
+   * ------------------------------------------------------------------ */
+
+  function formatTime(seconds) {
+    const total = Math.max(0, Math.ceil(seconds));
+    const m = Math.floor(total / 60);
+    const s = total % 60;
+    return `${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
+  }
+
+  function nextExerciseAfterWork() {
+    let ex = run.exIndex + 1;
+    let set = run.setIndex;
+    if (ex >= settings.exercises.length) {
+      ex = 0;
+      set += 1;
+    }
+    if (set >= settings.sets) return null;
+    return settings.exercises[ex];
+  }
+
+  function render() {
+    const total = settings.exercises.length;
+    const current = total ? settings.exercises[run.exIndex] : null;
+
+    els.body.classList.toggle('phase-work', run.phase === 'work');
+    els.body.classList.toggle('phase-done', run.phase === 'done');
+    els.body.classList.toggle('phase-paused', run.paused);
+
+    if (run.phase === 'idle') {
+      els.progress.textContent = total
+        ? `${settings.sets} set${settings.sets === 1 ? '' : 's'} · ${total} exercise${total === 1 ? '' : 's'}`
+        : '';
+      els.phaseLabel.textContent = 'Ready';
+      els.exerciseName.textContent = current || 'Add your exercises';
+      els.clock.textContent = formatTime(settings.pauseSec);
+      els.nextUp.textContent = total
+        ? `Pause ${settings.pauseSec}s, then ${settings.workSec}s training`
+        : '';
+    } else if (run.phase === 'done') {
+      els.progress.textContent = 'Complete';
+      els.phaseLabel.textContent = 'Done';
+      els.exerciseName.textContent = 'Workout complete';
+      els.clock.textContent = '00:00';
+      els.nextUp.textContent = `${settings.sets} set${settings.sets === 1 ? '' : 's'} finished`;
+    } else {
+      els.progress.textContent =
+        `Set ${run.setIndex + 1} / ${settings.sets} · Exercise ${run.exIndex + 1} / ${total}`;
+      els.phaseLabel.textContent = run.paused
+        ? 'Paused'
+        : run.phase === 'work' ? 'Training' : 'Pause';
+      els.exerciseName.textContent = current || '';
+      els.clock.textContent = formatTime(run.remaining);
+
+      if (run.phase === 'pause') {
+        els.nextUp.textContent = `Next: ${settings.workSec}s training`;
+      } else {
+        const next = nextExerciseAfterWork();
+        els.nextUp.textContent = next ? `Next: ${next}` : 'Last one — finish strong';
+      }
+    }
+
+    renderControls();
+  }
+
+  function renderControls() {
+    const active = isActive();
+    els.startBtn.hidden = active;
+    els.startBtn.textContent = run.phase === 'done' ? 'Restart' : 'Start';
+    els.pauseBtn.hidden = !active;
+    els.pauseBtn.textContent = run.paused ? 'Resume' : 'Pause';
+    els.resetBtn.hidden = !active && run.phase !== 'done';
+
+    const lock = active;
+    els.pauseInput.disabled = lock;
+    els.workInput.disabled = lock;
+    els.setsInput.disabled = lock;
+    els.exerciseInput.disabled = lock;
+    els.addBtn.disabled = lock;
+    els.exerciseList.querySelectorAll('button').forEach((b) => { b.disabled = lock; });
+  }
+
+  function renderExerciseList() {
+    els.exerciseList.textContent = '';
+    settings.exercises.forEach((name, i) => {
+      const li = document.createElement('li');
+
+      const idx = document.createElement('span');
+      idx.className = 'idx';
+      idx.textContent = `${i + 1}.`;
+
+      const label = document.createElement('span');
+      label.className = 'name';
+      label.textContent = name;
+
+      const remove = document.createElement('button');
+      remove.type = 'button';
+      remove.className = 'remove-btn';
+      remove.textContent = '\u00d7';
+      remove.setAttribute('aria-label', `Remove ${name}`);
+      remove.addEventListener('click', () => {
+        settings.exercises.splice(i, 1);
+        saveSettings();
+        renderExerciseList();
+        render();
+      });
+
+      li.append(idx, label, remove);
+      els.exerciseList.append(li);
+    });
+
+    els.emptyHint.hidden = settings.exercises.length > 0;
+    renderControls();
+  }
+
+  /* ------------------------------------------------------------------ *
+   * settings UI
+   * ------------------------------------------------------------------ */
+
+  function openSettings() {
+    els.settings.hidden = false;
+    els.settingsToggle.setAttribute('aria-expanded', 'true');
+  }
+
+  function toggleSettings() {
+    const open = els.settings.hidden;
+    els.settings.hidden = !open;
+    els.settingsToggle.setAttribute('aria-expanded', String(open));
+  }
+
+  function addExercise() {
+    const name = els.exerciseInput.value.trim();
+    if (!name) return;
+    settings.exercises.push(name);
+    saveSettings();
+    els.exerciseInput.value = '';
+    renderExerciseList();
+    render();
+    els.exerciseInput.focus();
+  }
+
+  function bindNumberInput(input, key, min, max) {
+    input.value = String(settings[key]);
+    input.addEventListener('change', () => {
+      settings[key] = clampInt(input.value, min, max, DEFAULTS[key]);
+      input.value = String(settings[key]);
+      saveSettings();
+      render();
+    });
+  }
+
+  /* ------------------------------------------------------------------ *
+   * wiring
+   * ------------------------------------------------------------------ */
+
+  bindNumberInput(els.pauseInput, 'pauseSec', 0, 3600);
+  bindNumberInput(els.workInput, 'workSec', 1, 3600);
+  bindNumberInput(els.setsInput, 'sets', 1, 999);
+
+  els.startBtn.addEventListener('click', start);
+  els.pauseBtn.addEventListener('click', togglePause);
+  els.resetBtn.addEventListener('click', reset);
+  els.settingsToggle.addEventListener('click', toggleSettings);
+  els.addBtn.addEventListener('click', addExercise);
+  els.exerciseInput.addEventListener('keydown', (e) => {
+    if (e.key === 'Enter') {
+      e.preventDefault();
+      addExercise();
+    }
+  });
+
+  document.addEventListener('visibilitychange', () => {
+    if (document.visibilityState === 'visible') {
+      if (isActive() && !run.paused) tick();
+      if (isActive() && !wakeLock) requestWakeLock();
+    }
+  });
+
+  // space bar toggles pause on desktop
+  document.addEventListener('keydown', (e) => {
+    if (e.code === 'Space' && isActive() && e.target.tagName !== 'INPUT') {
+      e.preventDefault();
+      togglePause();
+    }
+  });
+
+  renderExerciseList();
+  render();
+
+  /* ------------------------------------------------------------------ *
+   * PWA: service worker + install prompt
+   * ------------------------------------------------------------------ */
+
+  if ('serviceWorker' in navigator) {
+    window.addEventListener('load', () => {
+      navigator.serviceWorker.register('./sw.js').catch(() => {});
+    });
+  }
+
+  let deferredPrompt = null;
+  window.addEventListener('beforeinstallprompt', (e) => {
+    e.preventDefault();
+    deferredPrompt = e;
+    const btn = document.createElement('button');
+    btn.type = 'button';
+    btn.className = 'btn';
+    btn.textContent = 'Install app';
+    btn.addEventListener('click', async () => {
+      if (!deferredPrompt) return;
+      deferredPrompt.prompt();
+      await deferredPrompt.userChoice;
+      deferredPrompt = null;
+      els.installHint.textContent = '';
+    });
+    els.installHint.textContent = '';
+    els.installHint.append(btn);
+  });
+})();
+3Ì
+ekQ
j®bÅj®bÅIòïj®cCO^partitionKey=%28http%2C127.0.0.1%29,:http://127.0.0.1:8765/app.jsstrongly-framed1request-methodGETresponse-headHTTP/1.0 200 OK
+Server: SimpleHTTP/0.6 Python/3.14.4
+Date: Sat, 19 Sep 2026 10:24:05 GMT
+Content-type: text/javascript
+Content-Length: 16154
+Last-Modified: Sat, 19 Sep 2026 10:13:36 GMT
+original-response-headersServer: SimpleHTTP/0.6 Python/3.14.4
+Date: Sat, 19 Sep 2026 10:24:05 GMT
+Content-type: text/javascript
+Content-Length: 16154
+Last-Modified: Sat, 19 Sep 2026 10:13:36 GMT
+ctid2net-response-time-onstart4net-response-time-onstop5?
\ No newline at end of file
diff --git a/tmp-ffprof/cache2/entries/360DE1F3E174E84794C36651DD126686164A2F9A b/tmp-ffprof/cache2/entries/360DE1F3E174E84794C36651DD126686164A2F9A
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diff --git a/tmp-ffprof/cache2/entries/9085CF9B24AE65C77BD081772230413CCEE1184A b/tmp-ffprof/cache2/entries/9085CF9B24AE65C77BD081772230413CCEE1184A
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diff --git a/tmp-ffprof/cache2/entries/A03CE2818598B535678ED3CDB1A376FD46FB5FF2 b/tmp-ffprof/cache2/entries/A03CE2818598B535678ED3CDB1A376FD46FB5FF2
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diff --git a/tmp-ffprof/cache2/entries/E482BE33A6F82D22EF970CF4950D6CDAE376EBC4 b/tmp-ffprof/cache2/entries/E482BE33A6F82D22EF970CF4950D6CDAE376EBC4
new file mode 100644
index 0000000..6afeec4
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diff --git a/tmp-ffprof/cert9.db b/tmp-ffprof/cert9.db
new file mode 100644
index 0000000..b7b53c2
Binary files /dev/null and b/tmp-ffprof/cert9.db differ
diff --git a/tmp-ffprof/compatibility.ini b/tmp-ffprof/compatibility.ini
new file mode 100644
index 0000000..e70f811
--- /dev/null
+++ b/tmp-ffprof/compatibility.ini
@@ -0,0 +1,5 @@
+[Compatibility]
+LastVersion=155.0.1_20260904071051/20260904071051
+LastOSABI=Linux_x86_64-gcc3
+LastPlatformDir=/snap/firefox/8863/usr/lib/firefox
+LastAppDir=/snap/firefox/8863/usr/lib/firefox/browser
diff --git a/tmp-ffprof/cookies.sqlite b/tmp-ffprof/cookies.sqlite
new file mode 100644
index 0000000..f50aa69
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diff --git a/tmp-ffprof/datareporting/archived/2026-09/1789813445838.adfba4ed-07a6-45c7-81b8-dad6b639df68.new-profile.jsonlz4 b/tmp-ffprof/datareporting/archived/2026-09/1789813445838.adfba4ed-07a6-45c7-81b8-dad6b639df68.new-profile.jsonlz4
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diff --git a/tmp-ffprof/datareporting/archived/2026-09/1789813445845.36dada9b-7991-49d0-8ba8-f67c8e1c5427.event.jsonlz4 b/tmp-ffprof/datareporting/archived/2026-09/1789813445845.36dada9b-7991-49d0-8ba8-f67c8e1c5427.event.jsonlz4
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diff --git a/tmp-ffprof/datareporting/archived/2026-09/1789813445852.f7af7a4c-b941-4403-8289-19b458caa23e.main.jsonlz4 b/tmp-ffprof/datareporting/archived/2026-09/1789813445852.f7af7a4c-b941-4403-8289-19b458caa23e.main.jsonlz4
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diff --git a/tmp-ffprof/datareporting/archived/2026-09/1789813445853.5be2fcab-6c50-4108-99e3-a968ab37ae56.first-shutdown.jsonlz4 b/tmp-ffprof/datareporting/archived/2026-09/1789813445853.5be2fcab-6c50-4108-99e3-a968ab37ae56.first-shutdown.jsonlz4
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index 0000000..fbfe1ac
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diff --git a/tmp-ffprof/datareporting/glean/client_id.txt b/tmp-ffprof/datareporting/glean/client_id.txt
new file mode 100644
index 0000000..db97c60
--- /dev/null
+++ b/tmp-ffprof/datareporting/glean/client_id.txt
@@ -0,0 +1 @@
+282c8a0b-de08-4073-83e2-6349be31c557
\ No newline at end of file
diff --git a/tmp-ffprof/datareporting/glean/db/data.safe.bin b/tmp-ffprof/datareporting/glean/db/data.safe.bin
new file mode 100644
index 0000000..fbfc807
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diff --git a/tmp-ffprof/datareporting/glean/events/events b/tmp-ffprof/datareporting/glean/events/events
new file mode 100644
index 0000000..bf7a75a
--- /dev/null
+++ b/tmp-ffprof/datareporting/glean/events/events
@@ -0,0 +1,9 @@
+{"timestamp":439193142,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"loadfail_reason":"File doesn't exist.","path_key":"clean","can_load":"false","glean_timestamp":"1789813444852"}}
+{"timestamp":439193151,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"loadfail_reason":"File doesn't exist.","can_load":"false","path_key":"recovery","glean_timestamp":"1789813444861"}}
+{"timestamp":439193193,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"can_load":"false","path_key":"recoveryBackup","glean_timestamp":"1789813444903","loadfail_reason":"File doesn't exist."}}
+{"timestamp":439193211,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"glean_timestamp":"1789813444921","loadfail_reason":"File doesn't exist.","path_key":"cleanBackup","can_load":"false"}}
+{"timestamp":439193216,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"loadfail_reason":"File doesn't exist.","glean_timestamp":"1789813444927","path_key":"clean","can_load":"false"}}
+{"timestamp":439193228,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"path_key":"recovery","can_load":"false","loadfail_reason":"File doesn't exist.","glean_timestamp":"1789813444939"}}
+{"timestamp":439193293,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"can_load":"false","glean_timestamp":"1789813445003","loadfail_reason":"File doesn't exist.","path_key":"recoveryBackup"}}
+{"timestamp":439193322,"category":"session_restore","name":"backup_can_be_loaded_session_file","extra":{"glean_timestamp":"1789813445033","path_key":"cleanBackup","can_load":"false","loadfail_reason":"File doesn't exist."}}
+{"timestamp":439194211,"category":"glean","name":"session_start","extra":{"session_start_time":"2026-09-19T07:24:05.921-03:00","glean_timestamp":"439194211","sampled_in":"true","session_id":"11f4d217-12a6-4446-8cc0-07068fb4f43e","session_seq":"1"}}
diff --git a/tmp-ffprof/datareporting/glean/events/pageload b/tmp-ffprof/datareporting/glean/events/pageload
new file mode 100644
index 0000000..b9e913c
--- /dev/null
+++ b/tmp-ffprof/datareporting/glean/events/pageload
@@ -0,0 +1 @@
+{"timestamp":439193704,"category":"perf","name":"page_load","extra":{"http_ver":"1","using_webdriver":"false","time_to_request_start":"17","load_time":"242","cache_disposition":"4","interaction_count":"0","script_memory_cache_revived":"0","script_memory_cache_use":"0","script_from_necko_serialized":"0","script_from_necko_text":"1","load_type":"NORMAL","dns_lookup_time":"0","script_memory_cache_evicted_dirty":"0","js_exec_time":"4","response_time":"23","glean_timestamp":"1789813445414"}}
diff --git a/tmp-ffprof/datareporting/glean/pending_pings/04c02fd7-1a9f-4565-8897-de4e3ce8a32f b/tmp-ffprof/datareporting/glean/pending_pings/04c02fd7-1a9f-4565-8897-de4e3ce8a32f
new file mode 100644
index 0000000..3d7e0f3
--- /dev/null
+++ b/tmp-ffprof/datareporting/glean/pending_pings/04c02fd7-1a9f-4565-8897-de4e3ce8a32f
@@ -0,0 +1,3 @@
+/submit/firefox-desktop/baseline/1/04c02fd7-1a9f-4565-8897-de4e3ce8a32f
+{"ping_info":{"seq":0,"start_time":"2026-09-19T07:24:05.866-03:00","end_time":"2026-09-19T07:24:05.922-03:00","reason":"active"},"client_info":{"telemetry_sdk_build":"68.0.1","build_date":"1970-01-01T00:00:00+00:00","first_run_date":"2026-09-19-03:00","client_id":"282c8a0b-de08-4073-83e2-6349be31c557","app_channel":"release","os_version":"7.0","architecture":"x86_64","app_display_version":"155.0.1","os":"Linux","app_build":"20260904071051","locale":"de","distribution":{"name":"canonical-002"}},"metrics":{"uuid":{"legacy.telemetry.client_id":"f8fb24d3-61c2-4342-b9fb-cb5679e729fc","legacy.telemetry.profile_group_id":"dd6a2853-9d81-4edd-b920-ae094d7305ee"},"object":{"glean.distribution.ext":{"distributionVersion":"1.0","partnerId":"ubuntu","distributor":"canonical","distributorChannel":"","partnerNames":["ubuntu"]}},"string":{"startup.profile_selection_reason":"argument-profile"},"boolean":{"policies.is_enterprise":false}}}
+{"headers":{},"body_has_info_sections":true,"ping_name":"baseline","uploader_capabilities":[]}
\ No newline at end of file
diff --git a/tmp-ffprof/datareporting/glean/pending_pings/3b8fea54-ce26-4592-aefe-4ef35a912ce6 b/tmp-ffprof/datareporting/glean/pending_pings/3b8fea54-ce26-4592-aefe-4ef35a912ce6
new file mode 100644
index 0000000..a2b3d99
--- /dev/null
+++ b/tmp-ffprof/datareporting/glean/pending_pings/3b8fea54-ce26-4592-aefe-4ef35a912ce6
@@ -0,0 +1,3 @@
+/submit/firefox-desktop/health/1/3b8fea54-ce26-4592-aefe-4ef35a912ce6
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diff --git a/tmp-ffprof/datareporting/glean/pending_pings/83ef7c73-727e-4aa1-b87c-92ec69a613bf b/tmp-ffprof/datareporting/glean/pending_pings/83ef7c73-727e-4aa1-b87c-92ec69a613bf
new file mode 100644
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diff --git a/tmp-ffprof/datareporting/session-state.json b/tmp-ffprof/datareporting/session-state.json
new file mode 100644
index 0000000..14beb3c
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diff --git a/tmp-ffprof/datareporting/state.json b/tmp-ffprof/datareporting/state.json
new file mode 100644
index 0000000..30bfc01
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diff --git a/tmp-ffprof/extension-preferences.json b/tmp-ffprof/extension-preferences.json
new file mode 100644
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diff --git a/tmp-ffprof/extensions.json b/tmp-ffprof/extensions.json
new file mode 100644
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diff --git a/tmp-ffprof/extensions/langpack-de@firefox.mozilla.org.xpi b/tmp-ffprof/extensions/langpack-de@firefox.mozilla.org.xpi
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diff --git a/tmp-ffprof/favicons.sqlite b/tmp-ffprof/favicons.sqlite
new file mode 100644
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Binary files /dev/null and b/tmp-ffprof/favicons.sqlite differ
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diff --git a/tmp-ffprof/lock b/tmp-ffprof/lock
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diff --git a/tmp-ffprof/pkcs11.txt b/tmp-ffprof/pkcs11.txt
new file mode 100644
index 0000000..6029a96
--- /dev/null
+++ b/tmp-ffprof/pkcs11.txt
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diff --git a/tmp-ffprof/places.sqlite-wal b/tmp-ffprof/places.sqlite-wal
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diff --git a/tmp-ffprof/prefs.js b/tmp-ffprof/prefs.js
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--- /dev/null
+++ b/tmp-ffprof/prefs.js
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+//
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+user_pref("app.update.auto", false);
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+user_pref("browser.bookmarks.restore_default_bookmarks", false);
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diff --git a/tmp-ffprof/times.json b/tmp-ffprof/times.json
new file mode 100644
index 0000000..495da20
--- /dev/null
+++ b/tmp-ffprof/times.json
@@ -0,0 +1 @@
+{"firstUse":1789813444852,"created":1789813442191}
\ No newline at end of file
diff --git a/tmp-ffprof/user.js b/tmp-ffprof/user.js
new file mode 100644
index 0000000..38b8135
--- /dev/null
+++ b/tmp-ffprof/user.js
@@ -0,0 +1,5 @@
+user_pref("browser.shell.checkDefaultBrowser", false);
+user_pref("browser.startup.homepage_override.mstone", "ignore");
+user_pref("datareporting.policy.dataSubmissionEnabled", false);
+user_pref("toolkit.telemetry.enabled", false);
+user_pref("app.update.auto", false);
diff --git a/tools/make_icons.py b/tools/make_icons.py
new file mode 100644
index 0000000..7d04d1b
--- /dev/null
+++ b/tools/make_icons.py
@@ -0,0 +1,53 @@
+"""Generates the PWA icons. Run: python3 tools/make_icons.py"""
+
+import os
+
+from PIL import Image, ImageDraw
+
+BG = (14, 14, 17, 255)
+GREY = (139, 139, 150, 255)
+RED = (255, 59, 48, 255)
+WHITE = (242, 242, 245, 255)
+
+OUT_DIR = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "icons")
+SS = 4  # supersampling factor for smooth edges
+
+
+def make_icon(size, content_scale):
+    s = size * SS
+    img = Image.new("RGBA", (s, s), BG)
+    d = ImageDraw.Draw(img)
+
+    cx = cy = s / 2
+    r = s * content_scale / 2
+    width = int(s * 0.072)
+    box = [cx - r, cy - r, cx + r, cy + r]
+
+    # grey arc = pause (270 deg), red arc = training (90 deg)
+    d.arc(box, start=-90, end=180, fill=GREY, width=width)
+    d.arc(box, start=180, end=270, fill=RED, width=width)
+
+    # clock hand pointing up
+    hand_w = int(s * 0.05)
+    d.line([(cx, cy), (cx, cy - r * 0.58)], fill=WHITE, width=hand_w)
+    dot = hand_w * 0.9
+    d.ellipse([cx - dot, cy - dot, cx + dot, cy + dot], fill=WHITE)
+
+    return img.resize((size, size), Image.Resampling.LANCZOS)
+
+
+def main():
+    os.makedirs(OUT_DIR, exist_ok=True)
+    targets = [
+        ("icon-192.png", 192, 0.78),
+        ("icon-512.png", 512, 0.78),
+        ("icon-maskable-512.png", 512, 0.60),
+    ]
+    for name, size, scale in targets:
+        path = os.path.join(OUT_DIR, name)
+        make_icon(size, scale).save(path, "PNG")
+        print("wrote", path)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tools/probe_firefox.py b/tools/probe_firefox.py
new file mode 100644
index 0000000..0ab0628
--- /dev/null
+++ b/tools/probe_firefox.py
@@ -0,0 +1,117 @@
+"""Probes Firefox's web-platform support by loading a page that reports back.
+
+Usage: python3 tools/probe_firefox.py
+Launches headless Firefox against a local page whose script POSTs its feature
+detection results back to this server, then prints them.
+"""
+
+import http.server
+import json
+import os
+import shutil
+import subprocess
+import threading
+
+PORT = 8766
+
+# Snap-confined Firefox cannot see /tmp, so the profile lives next to the repo.
+ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+PROFILE = os.path.join(ROOT, 'tmp-ffprof-probe')
+
+USER_JS = '''
+user_pref("browser.shell.checkDefaultBrowser", false);
+user_pref("browser.startup.homepage_override.mstone", "ignore");
+user_pref("datareporting.policy.dataSubmissionEnabled", false);
+user_pref("toolkit.telemetry.enabled", false);
+user_pref("app.update.auto", false);
+'''
+
+PAGE = """<!doctype html>
+<html><head><link rel="manifest" href="/manifest.webmanifest"></head>
+<body><script>
+const info = {
+  userAgent: navigator.userAgent,
+  beforeinstallprompt: 'onbeforeinstallprompt' in window,
+  serviceWorker: 'serviceWorker' in navigator,
+  wakeLock: 'wakeLock' in navigator,
+  vibrate: typeof navigator.vibrate === 'function',
+  audioContext: !!(window.AudioContext || window.webkitAudioContext),
+  localStorage: (() => { try { localStorage.setItem('t', '1'); return true; } catch { return false; } })(),
+  standaloneDisplayMode: matchMedia('(display-mode: standalone)').matches,
+  secureContext: window.isSecureContext,
+  manifestParsed: (() => {
+    const m = document.querySelector('link[rel=manifest]');
+    return m ? m.href : null;
+  })(),
+};
+fetch('/report', { method: 'POST', body: JSON.stringify(info) });
+</script></body></html>"""
+
+report = {}
+done = threading.Event()
+
+
+class Handler(http.server.BaseHTTPRequestHandler):
+    def do_GET(self):
+        if self.path == '/manifest.webmanifest':
+            body = json.dumps({
+                "name": "Probe", "short_name": "Probe", "start_url": "./",
+                "display": "standalone",
+                "icons": [{"src": "/icon.png", "sizes": "192x192", "type": "image/png"}],
+            }).encode()
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/manifest+json')
+            self.send_header('Content-Length', str(len(body)))
+            self.end_headers()
+            self.wfile.write(body)
+            return
+        body = PAGE.encode()
+        self.send_response(200)
+        self.send_header('Content-Type', 'text/html')
+        self.send_header('Content-Length', str(len(body)))
+        self.end_headers()
+        self.wfile.write(body)
+
+    def do_POST(self):
+        length = int(self.headers.get('Content-Length', 0))
+        report.update(json.loads(self.rfile.read(length) or b'{}'))
+        self.send_response(204)
+        self.end_headers()
+        done.set()
+
+    def log_message(self, *args):
+        pass
+
+
+def main():
+    server = http.server.ThreadingHTTPServer(('127.0.0.1', PORT), Handler)
+    threading.Thread(target=server.serve_forever, daemon=True).start()
+
+    shutil.rmtree(PROFILE, ignore_errors=True)
+    os.makedirs(PROFILE, exist_ok=True)
+    with open(os.path.join(PROFILE, 'user.js'), 'w') as fh:
+        fh.write(USER_JS)
+
+    proc = subprocess.Popen(
+        ['firefox', '--headless', '--no-remote', '--new-instance',
+         '--profile', PROFILE, f'http://127.0.0.1:{PORT}/'],
+        stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
+    )
+
+    ok = done.wait(timeout=30)
+    proc.terminate()
+    try:
+        proc.wait(timeout=10)
+    except subprocess.TimeoutExpired:
+        proc.kill()
+    server.shutdown()
+    shutil.rmtree(PROFILE, ignore_errors=True)
+
+    if not ok:
+        print('probe: no report received (Firefox did not run the page)')
+        return
+    print(json.dumps(report, indent=2, sort_keys=True))
+
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
diff --git a/tools/smoke_test.mjs b/tools/smoke_test.mjs
new file mode 100644
index 0000000..224695c
--- /dev/null
+++ b/tools/smoke_test.mjs
@@ -0,0 +1,320 @@
+/**
+ * Functional smoke test: drives the real page in headless Chrome over CDP.
+ * Assumes a server on 127.0.0.1:8765 and Chrome with --remote-debugging-port=9222.
+ */
+
+const PORT = 9222;
+const ORIGIN = '127.0.0.1:8765';
+
+const GREY = 'rgb(139, 139, 150)';
+const RED = 'rgb(255, 59, 48)';
+
+function fail(msg) {
+  console.error('FAIL: ' + msg);
+  process.exit(1);
+}
+
+async function connect() {
+  const res = await fetch(`http://127.0.0.1:${PORT}/json/list`);
+  const targets = await res.json();
+  const page = targets.find((t) => t.type === 'page' && t.url.includes(ORIGIN));
+  if (!page) fail('page target not found: ' + JSON.stringify(targets.map((t) => t.url)));
+
+  const ws = new WebSocket(page.webSocketDebuggerUrl);
+  await new Promise((resolve, reject) => {
+    ws.addEventListener('open', resolve, { once: true });
+    ws.addEventListener('error', reject, { once: true });
+  });
+
+  let nextId = 0;
+  const pending = new Map();
+  ws.addEventListener('message', (ev) => {
+    const msg = JSON.parse(ev.data);
+    const resolve = pending.get(msg.id);
+    if (resolve) {
+      pending.delete(msg.id);
+      resolve(msg);
+    }
+  });
+
+  const send = (method, params) =>
+    new Promise((resolve) => {
+      const id = ++nextId;
+      pending.set(id, resolve);
+      ws.send(JSON.stringify({ id, method, params }));
+    });
+
+  const evaluate = async (expression) => {
+    const msg = await send('Runtime.evaluate', {
+      expression,
+      returnByValue: true,
+      awaitPromise: true,
+    });
+    if (msg.result?.exceptionDetails) {
+      throw new Error('page exception: ' + JSON.stringify(msg.result.exceptionDetails));
+    }
+    return msg.result.result.value;
+  };
+
+  return { evaluate, send, close: () => ws.close() };
+}
+
+const SNAPSHOT = `(() => {
+  const clock = document.getElementById('clock');
+  const exName = document.getElementById('exerciseName');
+  return {
+    phase: document.getElementById('phaseLabel').textContent,
+    exercise: exName.textContent,
+    clock: clock.textContent,
+    progress: document.getElementById('progress').textContent,
+    next: document.getElementById('nextUp').textContent,
+    bodyClass: document.body.className,
+    exColor: getComputedStyle(exName).color,
+    clockColor: getComputedStyle(clock).color,
+  };
+})()`;
+
+const SETUP = `(() => {
+  // measure target colours, not the in-flight transition
+  const style = document.createElement('style');
+  style.textContent = '* { transition: none !important; animation: none !important; }';
+  document.head.append(style);
+
+  const setVal = (id, v) => {
+    const el = document.getElementById(id);
+    el.value = String(v);
+    el.dispatchEvent(new Event('change', { bubbles: true }));
+  };
+  setVal('pauseInput', 2);
+  setVal('workInput', 1);
+  setVal('setsInput', 2);
+  const add = (name) => {
+    const input = document.getElementById('exerciseInput');
+    input.value = name;
+    document.getElementById('addBtn').click();
+  };
+  add('    ');        // blank input must be ignored
+  add('Push-ups');
+  add('Squats');
+  add('Plank');
+  document.getElementById('exerciseInput').value = 'Deadlift';
+  document.getElementById('addBtn').click();
+  document.querySelectorAll('#exerciseList li')[3].querySelector('button').click(); // remove Deadlift
+  return {
+    listed: Array.from(document.querySelectorAll('#exerciseList li .name')).map(n => n.textContent),
+    clockBeforeStart: document.getElementById('clock').textContent,
+    startLabel: document.getElementById('startBtn').textContent,
+  };
+})()`;
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+function expect(cond, msg) {
+  if (!cond) fail(msg);
+}
+
+/** Evaluate, tolerating the brief window where a reload has no execution context yet. */
+async function evaluateRetry(evaluate, expression, attempts = 15) {
+  for (let i = 0; i < attempts; i++) {
+    try {
+      return await evaluate(expression);
+    } catch {
+      await sleep(300);
+    }
+  }
+  return fail(`page never became responsive: ${expression}`);
+}
+
+/** "00:07" -> 7 */
+function toSecs(text) {
+  const [m, s] = text.split(':').map(Number);
+  return m * 60 + s;
+}
+
+async function main() {
+  const { evaluate, send, close } = await connect();
+
+  // the settings panel must be reachable before anything can be configured
+  await evaluate(`document.getElementById('settingsToggle').click()`);
+  const panel = await evaluate(`({
+    hidden: document.getElementById('settings').hidden,
+    expanded: document.getElementById('settingsToggle').getAttribute('aria-expanded'),
+  })`);
+  expect(!panel.hidden && panel.expanded === 'true', 'settings toggle should open the panel');
+
+  const setup = await evaluate(SETUP);
+  console.log('setup:', JSON.stringify(setup));
+
+  if (JSON.stringify(setup.listed) !== JSON.stringify(['Push-ups', 'Squats', 'Plank'])) {
+    fail('exercise list should hold exactly the three added names');
+  }
+  if (setup.startLabel !== 'Start') fail('start button should read "Start" before starting');
+
+  await evaluate(`document.getElementById('startBtn').click()`);
+
+  const seen = [];
+  const colors = { grey: 0, red: 0 };
+  const deadline = Date.now() + 30000;
+
+  while (Date.now() < deadline) {
+    const s = await evaluate(SNAPSHOT);
+    const key = `${s.phase}|${s.exercise}|${s.progress}`;
+    if (!seen.length || seen[seen.length - 1].key !== key) {
+      seen.push({ key, at: Date.now(), clockSecs: toSecs(s.clock), ...s });
+    } else {
+      const last = seen[seen.length - 1];
+      if (toSecs(s.clock) > last.clockSecs) fail(`clock went up during ${s.phase}: ${last.clock} -> ${s.clock}`);
+      last.clockSecs = toSecs(s.clock);
+    }
+    if (s.phase === 'Done') break;
+    await sleep(150);
+  }
+
+  console.log('\nobserved sequence:');
+  for (const s of seen) {
+    console.log(`  ${s.phase.padEnd(8)} | ${s.exercise.padEnd(16)} | ${s.clock} | ${s.progress} | ${s.next}`);
+    if (s.exercise === 'Workout complete') continue;
+    if (s.phase === 'Pause') {
+      if (s.exColor !== GREY || s.clockColor !== GREY) fail(`pause should be grey, got ${s.exColor}`);
+      colors.grey++;
+    } else if (s.phase === 'Training') {
+      if (s.exColor !== RED || s.clockColor !== RED) fail(`training should be red, got ${s.exColor}`);
+      colors.red++;
+    }
+  }
+
+  const expected = [
+    'Pause|Push-ups',
+    'Training|Push-ups',
+    'Pause|Squats',
+    'Training|Squats',
+    'Pause|Plank',
+    'Training|Plank',
+    'Pause|Push-ups',
+    'Training|Push-ups',
+    'Pause|Squats',
+    'Training|Squats',
+    'Pause|Plank',
+    'Training|Plank',
+    'Done|Workout complete',
+  ];
+
+  const actual = seen.map((s) => `${s.phase}|${s.exercise}`);
+  console.log('\nexpected:', expected.join(' -> '));
+  console.log('actual:  ', actual.join(' -> '));
+
+  if (actual.join('|') !== expected.join('|')) {
+    fail('phase sequence mismatch');
+  }
+
+  // each pause should last ~2s and each training block ~1s (poll lag allowed for).
+  // phases chain off their deadline, so error must not accumulate from one to the next.
+  for (let i = 0; i < seen.length - 1; i++) {
+    const expectedMs = seen[i].phase === 'Pause' ? 2000 : 1000;
+    const actualMs = seen[i + 1].at - seen[i].at;
+    console.log(`  ${seen[i].phase.padEnd(8)} ${String(actualMs).padStart(5)}ms (expected ~${expectedMs}ms)`);
+    if (Math.abs(actualMs - expectedMs) > 350) {
+      fail(`${seen[i].phase} of ${seen[i].exercise} lasted ${actualMs}ms, expected ~${expectedMs}ms`);
+    }
+  }
+
+  /* ---- restart / pause / resume / reset / persistence ---- */
+
+  await evaluate(`document.getElementById('startBtn').click()`);
+  await sleep(200);
+  let s = await evaluate(SNAPSHOT);
+  expect(s.phase === 'Pause' && s.progress.includes('Set 1 / 2'), `restart should begin a fresh session, got ${s.phase} / ${s.progress}`);
+  expect(s.exercise === 'Push-ups', `restart should show the first exercise, got ${s.exercise}`);
+
+  let ui = await evaluate(`({
+    startHidden: document.getElementById('startBtn').hidden,
+    resetHidden: document.getElementById('resetBtn').hidden,
+    inputsDisabled: document.getElementById('pauseInput').disabled && document.getElementById('addBtn').disabled,
+  })`);
+  expect(ui.startHidden && !ui.resetHidden, 'while running: Start hidden, Reset visible');
+  expect(ui.inputsDisabled, 'settings inputs should be locked while running');
+
+  await evaluate(`document.getElementById('pauseBtn').click()`);
+  await sleep(150);
+  const before = await evaluate(SNAPSHOT);
+  await sleep(700);
+  const after = await evaluate(SNAPSHOT);
+  expect(before.phase === 'Paused', `expected Paused label, got ${before.phase}`);
+  expect(before.clock === after.clock, `clock must freeze while paused: ${before.clock} -> ${after.clock}`);
+  expect(await evaluate(`document.getElementById('pauseBtn').textContent`) === 'Resume', 'pause button should offer Resume');
+
+  await evaluate(`document.getElementById('pauseBtn').click()`);
+  await sleep(150);
+  s = await evaluate(SNAPSHOT);
+  expect(s.phase === 'Pause', `resume should continue the paused phase, got ${s.phase}`);
+
+  await evaluate(`document.getElementById('resetBtn').click()`);
+  await sleep(200);
+  s = await evaluate(SNAPSHOT);
+  expect(s.phase === 'Ready' && s.clock === '00:02', `reset should return to Ready / 00:02, got ${s.phase} / ${s.clock}`);
+  ui = await evaluate(`({
+    startLabel: document.getElementById('startBtn').textContent,
+    startHidden: document.getElementById('startBtn').hidden,
+    pauseHidden: document.getElementById('pauseBtn').hidden,
+    resetHidden: document.getElementById('resetBtn').hidden,
+    inputsDisabled: document.getElementById('pauseInput').disabled,
+    listed: Array.from(document.querySelectorAll('#exerciseList li .name')).map((n) => n.textContent),
+  })`);
+  expect(ui.startLabel === 'Start' && !ui.startHidden, 'reset should restore the Start button');
+  expect(ui.pauseHidden && ui.resetHidden, 'reset should hide Pause and Reset');
+  expect(!ui.inputsDisabled, 'settings inputs should be editable again after reset');
+  expect(JSON.stringify(ui.listed) === JSON.stringify(['Push-ups', 'Squats', 'Plank']), 'exercises should survive a reset');
+
+  const stored = await evaluate(`localStorage.getItem('interval-timer/v1')`);
+  const parsed = JSON.parse(stored);
+  expect(
+    parsed.pauseSec === 2 && parsed.workSec === 1 && parsed.sets === 2 && parsed.exercises.length === 3,
+    'settings should be persisted: ' + stored
+  );
+  console.log('\nrestart/pause/resume/reset/persistence: ok');
+
+  /* ---- PWA: service worker, cached shell, offline boot ---- */
+
+  const sw = await evaluate(`(async () => {
+    if (!('serviceWorker' in navigator)) return { supported: false };
+    const reg = await navigator.serviceWorker.ready;
+    const keys = await caches.keys();
+    const cached = [];
+    for (const key of keys) {
+      for (const req of await (await caches.open(key)).keys()) {
+        cached.push(new URL(req.url).pathname);
+      }
+    }
+    return { supported: true, active: !!reg.active, scope: reg.scope, cached: cached.sort() };
+  })()`);
+  console.log('service worker:', JSON.stringify(sw));
+  expect(sw.supported, 'service workers should be supported in a secure context');
+  expect(sw.active, 'service worker should be installed and active');
+
+  for (const asset of ['/', '/index.html', '/styles.css', '/app.js', '/manifest.webmanifest',
+                       '/icons/icon-192.png', '/icons/icon-512.png', '/icons/icon-maskable-512.png']) {
+    expect(sw.cached.includes(asset), `app shell should be cached: ${asset} (have ${sw.cached.join(', ')})`);
+  }
+
+  await send('Network.enable');
+  await send('Page.enable');
+  await send('Network.emulateNetworkConditions', {
+    offline: true, latency: 0, downloadThroughput: 0, uploadThroughput: 0,
+  });
+  await send('Page.reload', {});
+
+  const offlinePhase = await evaluateRetry(evaluate, `document.getElementById('phaseLabel').textContent`);
+  const offlineEx = await evaluateRetry(evaluate, `document.getElementById('exerciseName').textContent`);
+  expect(offlinePhase === 'Ready', `app should boot from cache while offline, got "${offlinePhase}"`);
+  expect(offlineEx === 'Push-ups', `offline boot should restore saved exercises, got "${offlineEx}"`);
+  console.log('offline reload: ok (Phase="' + offlinePhase + '", Exercise="' + offlineEx + '")');
+
+  await send('Network.emulateNetworkConditions', {
+    offline: false, latency: 0, downloadThroughput: -1, uploadThroughput: -1,
+  });
+
+  close();
+  console.log(`\nPASS — pause/training sequence, grey->red colours, timing, controls, PWA offline all verified`);
+}
+
+main().catch((err) => fail(err.stack || String(err)));
\ No newline at end of file