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kasanoma_whisper.cpp_
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Kasanoma ASR</title>
  <link rel="preconnect" href="https://fonts.googleapis.com" />
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
  <link href="https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=DM+Mono:wght@300;400&family=Geist:wght@300;400;500&display=swap" rel="stylesheet" />
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@tabler/icons-webfont@latest/dist/tabler-icons.min.css" />

  <style>
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --bg:       #f4faf6;
      --surface:  #fbfdfc;
      --card:     #ffffff;
      --border:   rgba(42,92,69,0.10);
      --border-md: rgba(42,92,69,0.18);
      --text:     #16261f;
      --muted:    #5f7a6c;
      --hint:     #9db3a6;
      --accent:   #2a5c45;
      --accent-bg:#e8f5ee;
      --red:      #c0392b;
      --red-bg:   #fdf0ee;
      --font-serif: 'Instrument Serif', Georgia, serif;
      --font-sans:  'Geist', system-ui, sans-serif;
      --font-mono:  'DM Mono', monospace;
      --r-sm: 8px;
      --r-md: 12px;
      --r-lg: 18px;
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: var(--font-sans);
      background:
        radial-gradient(ellipse 900px 600px at 12% 0%, rgba(154,211,181,0.35), transparent 60%),
        radial-gradient(ellipse 900px 650px at 100% 15%, rgba(210,235,220,0.55), transparent 65%),
        radial-gradient(ellipse 800px 700px at 50% 100%, rgba(180,220,197,0.30), transparent 60%),
        linear-gradient(180deg, #ffffff 0%, #f2f9f5 45%, #eaf6ef 100%);
      background-attachment: fixed;
      color: var(--text);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 48px 20px 80px;
    }

    .page { width: 100%; max-width: 600px; }

    /* ── Topbar ── */
    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 52px;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 1.25rem;
      color: var(--text);
      letter-spacing: 0.01em;
    }
    .nav { display: flex; gap: 24px; list-style: none; }
    .nav a {
      font-size: 0.78rem;
      font-weight: 400;
      color: var(--muted);
      text-decoration: none;
      letter-spacing: 0.03em;
      transition: color 0.2s;
    }
    .nav a:hover { color: var(--text); }
    .samp{
      display: flex;
      align-items: center;
      gap: 6px;
      text-transform: none;
      background: var(--accent-bg);
      border-radius: 999px;
      padding: 5px 13px;
      margin-bottom: 18px;
    }
    .samp i{
      color: var(--accent);
      font-weight:500;
      color: var(--accent);
      font-style: normal;
      letter-spacing: 0.05em;
    }
    /* ── Hero ── */
    .hero { margin-bottom: 36px; }
    .hero-logo {
      height: 44px;
      width: auto;
      margin-bottom: 16px;
      display: block;
    }
    .lang-tag {  
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.72rem;
      font-weight: 500;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--accent);
      background: var(--accent-bg);
      border-radius: 999px;
      padding: 5px 13px;
      margin-bottom: 18px;
    }
    .lang-tag i { font-size: 13px; }
    .hero h1 {
      font-family: var(--font-serif);
      font-size: clamp(2.2rem, 6vw, 3rem);
      font-weight: 400;
      font-style: italic;
      color: var(--text);
      line-height: 1.1;
      margin-bottom: 12px;
      letter-spacing: -0.01em;
    }
    .hero p {
      font-size: 0.9rem;
      font-weight: 300;
      color: var(--muted);
      line-height: 1.7;
      max-width: 400px;
    }

    /* ── Card ── */
    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--r-lg);
      overflow: hidden;
      margin-bottom: 16px;
    }

    /* ── Section ── */
    .sec { padding: 24px; }
    .sec-label {
      font-size: 0.65rem;
      font-weight: 500;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--hint);
      margin-bottom: 14px;
    }

    /* ── Input rows ── */
    .input-row {
      display: flex;
      align-items: center;
      gap: 13px;
      padding: 13px 14px;
      border: 1px solid var(--border);
      border-radius: var(--r-md);
      cursor: pointer;
      transition: border-color 0.18s, background 0.18s;
      position: relative;
      overflow: hidden;
      background: var(--surface);
    }
    .input-row:hover { border-color: var(--border-md); background: #fff; }
    .input-row + .input-row { margin-top: 8px; }

    .row-icon {
      width: 34px; height: 34px;
      border-radius: 9px;
      background: var(--bg);
      border: 1px solid var(--border);
      display: flex; align-items: center; justify-content: center;
      flex-shrink: 0;
      color: var(--muted);
      font-size: 15px;
    }
    .row-body { flex: 1; }
    .row-title { font-size: 0.85rem; font-weight: 500; color: var(--text); }
    .row-sub { font-size: 0.72rem; color: var(--hint); margin-top: 1px; }
    .row-arrow { color: var(--hint); font-size: 16px; }
    input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

    .input-row.drag { background: var(--accent-bg); border-color: var(--accent); }

    /* ── Record state ── */
    .rec-row.on { border-color: rgba(192,57,43,0.25); background: var(--red-bg); }
    .rec-row.on .row-icon { background: var(--red-bg); border-color: rgba(192,57,43,0.2); color: var(--red); }
    .rec-row.on .row-title { color: var(--red); }
    .rec-row.on .row-arrow { display: none; }
    .rec-dot { display: none; width: 7px; height: 7px; border-radius: 50%; background: var(--red); flex-shrink: 0; }
    .rec-row.on .rec-dot { display: block; animation: blink 1s ease-in-out infinite; }

    /* ── File chip ── */
    .chip {
      display: none;
      align-items: center;
      gap: 8px;
      margin-top: 10px;
      padding: 9px 13px;
      border: 1px solid var(--border);
      border-radius: var(--r-sm);
      background: var(--surface);
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--muted);
    }
    .chip.on { display: flex; }
    .chip-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .chip-x { background: none; border: none; cursor: pointer; color: var(--hint); font-size: 14px; padding: 0; line-height: 1; transition: color 0.15s; }
    .chip-x:hover { color: var(--text); }

    /* ── Playback ── */
    .pb {
      display: none;
      align-items: center;
      gap: 10px;
      margin-top: 10px;
      padding: 10px 13px;
      border: 1px solid var(--border);
      border-radius: var(--r-sm);
      background: var(--surface);
    }
    .pb.on { display: flex; }
    .pb-btn {
      width: 30px; height: 30px;
      border-radius: 50%;
      border: 1px solid var(--border);
      background: var(--card);
      color: var(--text);
      cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      font-size: 11px;
      transition: border-color 0.15s;
      flex-shrink: 0;
    }
    .pb-btn:hover { border-color: var(--border-md); }
    .pb-bars { flex: 1; display: flex; align-items: center; gap: 2px; height: 22px; cursor: pointer; }
    .pb-bar { flex: 1; border-radius: 2px; background: var(--border); transition: background 0.08s; }
    .pb-bar.p { background: var(--accent); opacity: 0.6; }
    .pb-t { font-family: var(--font-mono); font-size: 0.68rem; color: var(--hint); white-space: nowrap; }
    audio { display: none; }

    /* ── Transcribe button ── */
    .go-btn {
      width: 100%;
      margin-top: 14px;
      padding: 13px;
      border: 1px solid var(--border-md);
      border-radius: var(--r-md);
      background: var(--text);
      color: #fff;
      font-family: var(--font-sans);
      font-size: 0.82rem;
      font-weight: 500;
      letter-spacing: 0.04em;
      cursor: pointer;
      display: flex; align-items: center; justify-content: center; gap: 8px;
      transition: opacity 0.2s, transform 0.15s;
    }
    .go-btn:hover { opacity: 0.88; transform: translateY(-1px); }
    .go-btn:active { transform: translateY(0); opacity: 1; }
    .go-btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }
    .spin { display: none; width: 12px; height: 12px; border: 1.5px solid rgba(255,255,255,0.25); border-top-color: #fff; border-radius: 50%; flex-shrink: 0; }
    .go-btn.loading .spin { display: block; animation: rot 0.65s linear infinite; }

    /* ── Output box ── */
    .out {
      min-height: 76px;
      padding: 14px 16px;
      border: 1px solid var(--border);
      border-radius: var(--r-md);
      background: var(--surface);
      font-family: var(--font-mono);
      font-size: 0.83rem;
      font-weight: 300;
      line-height: 1.8;
      color: var(--text);
      position: relative;
    }
    .out-ph { color: var(--hint); font-family: var(--font-sans); font-size: 0.82rem; font-style: italic; font-weight: 300; }
    .out-txt { display: none; }
    .out.has .out-ph { display: none; }
    .out.has .out-txt { display: block; }
    .copy-btn {
      position: absolute; top: 9px; right: 9px;
      width: 26px; height: 26px;
      border: 1px solid var(--border);
      border-radius: var(--r-sm);
      background: var(--card);
      color: var(--hint);
      font-size: 13px;
      cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      opacity: 0;
      transition: opacity 0.15s, color 0.15s;
    }
    .out:hover .copy-btn { opacity: 1; }
    .copy-btn:hover { color: var(--text); }

    /* ── Textarea ── */
    .edit-hint { font-size: 0.72rem; color: var(--hint); font-weight: 300; margin-bottom: 10px; line-height: 1.55; }
    textarea {
      width: 100%;
      min-height: 84px;
      padding: 13px 15px;
      border: 1px solid var(--border);
      border-radius: var(--r-md);
      background: var(--surface);
      font-family: var(--font-mono);
      font-size: 0.83rem;
      font-weight: 300;
      line-height: 1.8;
      color: var(--text);
      resize: vertical;
      outline: none;
      transition: border-color 0.18s;
    }
    textarea:focus { border-color: var(--border-md); background: #fff; }
    textarea::placeholder { color: var(--hint); font-style: italic; }

    /* ── Action buttons ── */
    .act { display: flex; gap: 8px; margin-top: 12px; }
    .save-btn {
      flex: 1;
      padding: 12px;
      border: 1px solid var(--accent);
      border-radius: var(--r-md);
      background: var(--accent-bg);
      color: var(--accent);
      font-family: var(--font-sans);
      font-size: 0.82rem;
      font-weight: 500;
      cursor: pointer;
      display: flex; align-items: center; justify-content: center; gap: 6px;
      transition: background 0.18s, border-color 0.18s;
    }
    .save-btn:hover { background: #ddeee5; }
    .save-btn:disabled { opacity: 0.45; cursor: not-allowed; }
    .save-btn.saved { color: var(--accent); }
    .disc-btn {
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--r-md);
      background: var(--surface);
      font-family: var(--font-sans);
      font-size: 0.82rem;
      font-weight: 400;
      color: var(--muted);
      cursor: pointer;
      transition: background 0.18s, color 0.18s;
    }
    .disc-btn:hover { background: var(--red-bg); color: var(--red); border-color: rgba(192,57,43,0.2); }

    /* ── Stats ── */
    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-bottom: 16px;
    }
    .stat {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--r-md);
      padding: 18px 16px;
      text-align: center;
    }
    .stat-v {
      font-family: var(--font-serif);
      font-style: italic;
      font-size: 1.8rem;
      color: var(--text);
      line-height: 1;
    }
    .stat-l {
      font-size: 0.65rem;
      font-weight: 500;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--hint);
      margin-top: 5px;
    }

    /* ── Footer ── */
    .footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-top: 8px;
      padding-top: 8px;
    }
    .footer-content {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .footer-copy { font-size: 0.72rem; color: var(--hint); }
    .footer-links { display: flex; gap: 18px; }
    .footer-links a { font-size: 0.72rem; color: var(--hint); text-decoration: none; transition: color 0.2s; }
    .footer-links a:hover { color: var(--muted); }
    .footer-logos {
      display: flex;
      gap: 12px;
      align-items: center;
    }
    .footer-logo {
      height: 72px;
      width: 72px;
      border-radius: 10%;
      background: var(--surface);
      transition: transform 0.2s ease, border-color 0.2s ease;
    }
    .footer-logo:hover {
      transform: scale(1.08);
      border-color: var(--accent);
    }

    /* ── Toast ── */
    .toast {
      position: fixed;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%) translateY(10px);
      padding: 9px 20px;
      border-radius: 999px;
      background: var(--text);
      color: #fff;
      font-size: 0.78rem;
      font-weight: 400;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.22s, transform 0.22s;
      z-index: 999;
      white-space: nowrap;
    }
    .toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }
    .toast.ok { background: var(--accent); }
    .toast.err { background: var(--red); }

    @keyframes blink { 0%,100%{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(.55)} }
    @keyframes rot { to { transform: rotate(360deg); } }

    /* ── Header Logo Section ── */
    .header-logo-section {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0px 2px 0px 2px;
      margin-bottom: 28px;
      animation: slideDown 0.5s ease;
      border-radius: 10px;
      border: 1px solid var(--border);
    }
    .header-logo-container {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .header-logo-container img {
      height: 64px;
      width: 96px;
      transition: transform 0.3s ease;
      border-radius: 6px;
      /* border: 1px solid var(--border); */
    }
    .header-logo-container img:hover {
      transform: scale(1.06);
    }
    .header-title {
      font-family: var(--font-serif);
      font-size: 1.15rem;
      font-weight: 600;
      color: var(--text);
      letter-spacing: -0.01em;
    }
    .header-nav {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .header-nav-link {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      padding: 7px 12px;
      /* border-radius: 6px;
      border: 1px solid var(--border); */
      /* background: var(--accent-bg); */
      color: var(--accent);
      text-decoration: none;
      font-size: 0.8rem;
      font-weight: 500;
      transition: all 0.2s ease;
      font-family: var(--font-sans);
    }
    .header-nav-link:hover {
      border-color: var(--accent);
      background: rgba(42, 92, 69, 0.15);
      color: var(--text);
    }
    @keyframes slideDown {
      from { opacity: 0; transform: translateY(-12px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 520px) {
      body { padding: 28px 14px 60px; }
      .stats { grid-template-columns: 1fr 1fr; }
      .stats .stat:last-child { grid-column: span 2; }
      .nav { display: none; }
      .footer { flex-direction: column; gap: 10px; }
      .header-nav { gap: 10px; }
      .header-nav-link { font-size: 0.75rem; padding: 6px 10px; }
    }
  </style>
</head>
<body>

<div class="page">

  <div class="header-logo-section">
    <div class="header-logo-container">
      <img src="/assets/logo.png" alt="Kasanoma logo" />
      <div class="header-title">Kasanoma</div>
    </div>
    <div class="header-nav">
      <a href="https://huggingface.co/datasets/Kennethdot/Ghana_English-Twi_Code-switching_ASR" class="header-nav-link">Docs</a>
      <a href="https://github.com/Kennethdotse/project-kasa" class="header-nav-link">GitHub</a>
    </div>
  </div>

  <div class="hero">
    <div class="lang-tag"><i class="ti ti-language" aria-hidden="true"></i>English · Twi code-switching</div>
    <h1>Record Speech<br>that mixes everyday English and Twi</h1>
    <div class= "samp"><i>Eg: "Send-i file no mame seesei a, me boss ɛbisa me"</i></div>
    <p>Record or upload audio, transcribe, then correct errors to help build the dataset.</p>
  </div>

  <div class="card">

    <div class="sec">
      <div class="sec-label">Audio input</div>

      <label class="input-row" id="upload-row">
        <div class="row-icon"><i class="ti ti-upload" aria-hidden="true"></i></div>
        <div class="row-body">
          <div class="row-title">Upload audio file</div>
          <div class="row-sub">WAV · MP3 · M4A · OGG</div>
        </div>
        <i class="ti ti-chevron-right row-arrow" aria-hidden="true"></i>
        <input type="file" id="audio-file-input" accept="audio/*" />
      </label>

      <div class="input-row rec-row" id="rec-btn">
        <div class="row-icon"><i class="ti ti-microphone" aria-hidden="true"></i></div>
        <div class="row-body">
          <div class="row-title" id="rec-label">Record from microphone</div>
          <div class="row-sub">Tap to start · tap again to stop</div>
        </div>
        <span class="rec-dot"></span>
        <i class="ti ti-chevron-right row-arrow" aria-hidden="true"></i>
      </div>

      <div class="chip" id="chip">
        <i class="ti ti-file-music" style="font-size:14px;flex-shrink:0" aria-hidden="true"></i>
        <span class="chip-name" id="chip-name"></span>
        <button class="chip-x" id="clear-file" aria-label="Remove file">✕</button>
      </div>

      <div class="pb" id="pb">
        <button class="pb-btn" id="play-btn" aria-label="Play/pause">
          <i class="ti ti-player-play" id="play-icon"></i>
        </button>
        <div class="pb-bars" id="pb-bars"></div>
        <span class="pb-t" id="pb-t">0:00</span>
        <audio id="audio-el"></audio>
      </div>

      <button class="go-btn" id="go-btn">
        <span class="spin"></span>
        <span class="go-text">Transcribe</span>
        <i class="ti ti-arrow-right" aria-hidden="true"></i>
      </button>
    </div>

    <div class="sec">
      <div class="sec-label">Transcription</div>
      <div class="out" id="out">
        <span class="out-ph">Transcription will appear here…</span>
        <span class="out-txt" id="out-txt"></span>
        <button class="copy-btn" id="copy-btn" aria-label="Copy transcription">
          <i class="ti ti-copy"></i>
        </button>
      </div>
    </div>
 
    <!-- COMMENTED OUT: Correct & save section
    <div class="sec">
      <div class="sec-label">Correct &amp; save</div>
      <p class="edit-hint">Fix any errors — your correction helps improve the model.</p>
      <textarea id="edit-ta" placeholder="Edit the transcription if needed…" rows="3"></textarea>
      <div class="act">
        <button class="save-btn" id="save-btn">
          <i class="ti ti-check" aria-hidden="true"></i> Save to dataset
        </button>
        <button class="disc-btn" id="disc-btn">Discard</button>
      </div>
    </div>
    -->

  </div> 

  <!-- <div class="stats">
    <div class="stat">
      <div class="stat-v" id="stat-saved">0</div>
      <div class="stat-l">Saved</div>
    </div>
    <div class="stat">
      <div class="stat-v" id="stat-wer">—</div>
      <div class="stat-l">WER</div>
    </div>
    <div class="stat">
      <div class="stat-v" style="font-size:1.1rem;font-style:normal;font-family:var(--font-sans);font-weight:500;padding-top:4px;">Twi · EN</div>
      <div class="stat-l">Language</div>
    </div>
  </div> -->

  <footer class="footer">
    <div class="footer-content">
      <span class="footer-copy">Project Kasa · 2026</span>
      <div class="footer-links">
        <a href="#">Privacy</a>
        <a href="#">Terms</a>
        <a href="#">Contact</a>
      </div>
    </div>
    <div class="footer-logos">
      <img src="/assets/logo.png" alt="Kasanoma logo" class="footer-logo" />
      <img src="/assets/gen.png" alt="Gen logo" class="footer-logo" />
    </div>
  </footer>

</div>

<div class="toast" id="toast"></div>

<script>
  const $ = id => document.getElementById(id);

  function toast(msg, type, ms = 2600) {
    const t = $('toast');
    t.textContent = msg;
    t.className = 'toast on' + (type ? ' ' + type : '');
    clearTimeout(t._t);
    t._t = setTimeout(() => t.className = 'toast', ms);
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  const N = 42;
  const pbBars = $('pb-bars');
  for (let i = 0; i < N; i++) {
    const b = document.createElement('div');
    b.className = 'pb-bar';
    b.style.height = Math.round(Math.random() * 68 + 20) + '%';
    pbBars.appendChild(b);
  }

  let audioBlob = null, mediaRecorder = null, isRec = false, chunks = [], saved = 0;
  const audioEl = $('audio-el');

  // ── Pick the best MIME type the browser actually supports ──
  function getBestMimeType() {
    const types = [
      'audio/webm;codecs=opus',
      'audio/webm',
      'audio/ogg;codecs=opus',
      'audio/ogg',
      'audio/mp4',
    ];
    return types.find(t => MediaRecorder.isTypeSupported(t)) || '';
  }

  // ── Map MIME type → file extension ──
  function mimeToExt(mime) {
    if (mime.includes('ogg'))  return '.ogg';
    if (mime.includes('mp4'))  return '.mp4';
    return '.webm'; // default — ffmpeg on the backend can decode webm
  }

  function loadFile(file) {
    audioBlob = file;
    $('chip-name').textContent = file.name;
    $('chip').classList.add('on');
    $('pb').classList.add('on');
    // Revoke any previous object URL to avoid memory leaks
    if (audioEl._objUrl) URL.revokeObjectURL(audioEl._objUrl);
    audioEl._objUrl = URL.createObjectURL(file);
    audioEl.src = audioEl._objUrl;
    audioEl.load(); // force the element to re-read the new source
  }

  $('audio-file-input').addEventListener('change', e => {
    if (e.target.files[0]) loadFile(e.target.files[0]);
  });

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  uploadRow.addEventListener('dragover', e => { e.preventDefault(); uploadRow.classList.add('drag'); });
  uploadRow.addEventListener('dragleave', () => uploadRow.classList.remove('drag'));
  uploadRow.addEventListener('drop', e => {
    e.preventDefault(); uploadRow.classList.remove('drag');
    const f = e.dataTransfer.files[0];
    if (f && f.type.startsWith('audio/')) loadFile(f);
    else toast('Please drop an audio file.', 'err');
  });

  $('clear-file').addEventListener('click', e => {
    e.preventDefault(); e.stopPropagation();
    audioBlob = null;
    $('audio-file-input').value = '';
    $('chip').classList.remove('on');
    $('pb').classList.remove('on');
    if (audioEl._objUrl) { URL.revokeObjectURL(audioEl._objUrl); audioEl._objUrl = null; }
    audioEl.src = '';
  });

  $('play-btn').addEventListener('click', () => {
    if (audioEl.paused) { audioEl.play(); $('play-icon').className = 'ti ti-player-pause'; }
    else { audioEl.pause(); $('play-icon').className = 'ti ti-player-play'; }
  });
  audioEl.addEventListener('ended', () => { $('play-icon').className = 'ti ti-player-play'; });
  audioEl.addEventListener('timeupdate', () => {
    const p = audioEl.duration ? audioEl.currentTime / audioEl.duration : 0;
    const filled = Math.round(p * N);
    [...pbBars.children].forEach((b, i) => b.classList.toggle('p', i < filled));
    const m = Math.floor(audioEl.currentTime / 60);
    const s = String(Math.floor(audioEl.currentTime % 60)).padStart(2, '0');
    $('pb-t').textContent = `${m}:${s}`;
  });

  $('rec-btn').addEventListener('click', async () => {
    if (!isRec) {
      try {
        const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
        const mimeType = getBestMimeType();
        if (!mimeType) {
          toast('Your browser doesn\'t support audio recording.', 'err');
          stream.getTracks().forEach(t => t.stop());
          return;
        }
        const options = mimeType ? { mimeType } : {};
        mediaRecorder = new MediaRecorder(stream, options);
        chunks = [];
        mediaRecorder.ondataavailable = e => { if (e.data.size > 0) chunks.push(e.data); };
        mediaRecorder.onerror = e => { 
          console.error('MediaRecorder error:', e);
          toast('Recording error: ' + e.error, 'err');
          stream.getTracks().forEach(t => t.stop());
        };
        mediaRecorder.onstop = () => {
          // Use the actual MIME type the recorder used, not a forced 'audio/wav'
          const actualMime = mediaRecorder.mimeType || mimeType || 'audio/webm';
          const ext = mimeToExt(actualMime);
          const blob = new Blob(chunks, { type: actualMime });
          loadFile(new File([blob], `recording${ext}`, { type: actualMime }));
          stream.getTracks().forEach(t => t.stop());
        };
        mediaRecorder.start();
        isRec = true;
        $('rec-btn').classList.add('on');
        $('rec-label').textContent = 'Stop recording';
      } catch (err) {
        console.error('Microphone error:', err);
        const msg = err.name === 'NotAllowedError' 
          ? 'Microphone permission denied.' 
          : err.name === 'NotFoundError'
          ? 'No microphone found.'
          : 'Microphone error: ' + err.message;
        toast(msg, 'err');
      }
    } else {
      mediaRecorder.stop();
      isRec = false;
      $('rec-btn').classList.remove('on');
      $('rec-label').textContent = 'Record from microphone';
    }
  });

  $('go-btn').addEventListener('click', async () => {
    if (!audioBlob) { toast('Upload or record audio first.', 'err'); return; }
    const btn = $('go-btn');
    btn.classList.add('loading'); btn.disabled = true;
    btn.querySelector('.go-text').textContent = 'Transcribing…';
    try {
      const fd = new FormData();
      fd.append('audio', audioBlob, audioBlob.name || 'audio.webm');
      const res = await fetch('/transcribe', { method: 'POST', body: fd });
      if (!res.ok) {
        const detail = await res.text();
        throw new Error(`Server error ${res.status}: ${detail}`);
      }
      const { transcription = '' } = await res.json();
      $('out').classList.add('has');
      $('out-txt').textContent = transcription;
      // $('edit-ta').value = transcription;  // textarea is commented out
      toast('Done', 'ok');
    } catch (err) {
      toast('Failed: ' + err.message, 'err');
    } finally {
      btn.classList.remove('loading'); btn.disabled = false;
      btn.querySelector('.go-text').textContent = 'Transcribe';
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  });

  $('copy-btn').addEventListener('click', () => {
    const t = $('out-txt').textContent;
    if (t) navigator.clipboard.writeText(t).then(() => toast('Copied', 'ok'));
  });

  // COMMENTED OUT: Save to dataset functionality
  // $('save-btn').addEventListener('click', async () => {
  //   const text = $('edit-ta').value.trim();
  //   if (!text) { toast('Nothing to save.', 'err'); return; }
  //   if (!audioBlob) { toast('No audio attached.', 'err'); return; }
  //   const btn = $('save-btn'); btn.disabled = true;
  //   try {
  //     const fd = new FormData();
  //     fd.append('audio', audioBlob, audioBlob.name || 'audio.webm');
  //     fd.append('transcription', text);
  //     const res = await fetch('/save', { method: 'POST', body: fd });
  //     if (!res.ok) throw new Error(`Server error ${res.status}`);
  //     saved++; $('stat-saved').textContent = saved;
  //     btn.classList.add('saved');
  //     setTimeout(() => btn.classList.remove('saved'), 2000);
  //     toast('Saved to dataset', 'ok');
  //   } catch (err) {
  //     toast('Save failed: ' + err.message, 'err');
  //   } finally { btn.disabled = false; }
  // });

  // COMMENTED OUT: Discard transcription
  // $('disc-btn').addEventListener('click', () => {
  //   $('edit-ta').value = '';
  //   $('out').classList.remove('has');
  //   $('out-txt').textContent = '';
  //   toast('Cleared');
  // });

  // COMMENTED OUT: Load real saved count from backend on page load
  // fetch('/dataset/stats')
  //   .then(r => r.json())
  //   .then(d => { if (d.total) { saved = d.total; $('stat-saved').textContent = saved; } })
  //   .catch(() => {});
</script>
</body>
</html>