:root[data-theme="dark"] {
      --bg: #0a0a0f;
      --surface: #13131a;
      --surface2: #1c1c28;
      --border: #2a2a3d;
      --text: #f0f0ff;
      --muted: #6b6b8a;
      --accent: #ff3c6e;
      --accent2: #ff7b54;
      --glow: rgba(255,60,110,0.25);
      --card-bg: #14141e;
      --success: #4ade80;
      --error: #ff4d6d;
      --warn: #fbbf24;
    }
    :root[data-theme="light"] {
      --bg: #f4f4f8;
      --surface: #ffffff;
      --surface2: #ebebf5;
      --border: #d5d5e8;
      --text: #0f0f1a;
      --muted: #7a7a99;
      --accent: #e0003c;
      --accent2: #ff5c2b;
      --glow: rgba(224,0,60,0.15);
      --card-bg: #ffffff;
      --success: #16a34a;
      --error: #dc2626;
      --warn: #d97706;
    }

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

    body {
      font-family: 'DM Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
      transition: background 0.3s, color 0.3s;
    }

    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background:
        radial-gradient(ellipse 60% 50% at 15% 20%, rgba(255,60,110,0.12) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 85% 80%, rgba(255,123,84,0.09) 0%, transparent 60%);
      pointer-events: none;
      z-index: 0;
    }

    /* ── NAV ── */
    nav {
      position: sticky;
      top: 0;
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 40px;
      background: rgba(10,10,15,0.75);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
    }
    [data-theme="light"] nav { background: rgba(244,244,248,0.85); }

    .logo {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo span { -webkit-text-fill-color: var(--text); color: var(--text); }

    .nav-right { display: flex; align-items: center; gap: 12px; }

    .theme-toggle {
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: 50px;
      padding: 8px 16px;
      cursor: pointer;
      font-family: 'DM Sans', sans-serif;
      font-size: 0.85rem;
      color: var(--text);
      display: flex;
      align-items: center;
      gap: 8px;
      transition: all 0.2s;
    }
    .theme-toggle:hover { border-color: var(--accent); }

    /* ── HERO ── */
    .hero {
      position: relative;
      z-index: 1;
      text-align: center;
      padding: 80px 20px 50px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: 50px;
      padding: 6px 18px;
      font-size: 0.78rem;
      color: var(--accent);
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 28px;
      font-weight: 500;
    }
    h1 {
      font-family: 'Syne', sans-serif;
      font-size: clamp(2.2rem, 6vw, 4.2rem);
      font-weight: 800;
      line-height: 1.1;
      letter-spacing: -1.5px;
      margin-bottom: 20px;
    }
    h1 .hl {
      background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      color: var(--muted);
      font-size: 1.1rem;
      max-width: 500px;
      margin: 0 auto 50px;
      line-height: 1.6;
      font-weight: 300;
    }
    .hero-pills {
      display: flex;
      justify-content: center;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: -30px;
      margin-bottom: 40px;
    }
    .hero-pill {
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: 50px;
      padding: 4px 14px;
      font-size: 0.75rem;
      color: var(--muted);
    }

    /* ── CLIPBOARD TOAST ── */
    #clipboard-toast {
      display: none;
      position: fixed;
      top: 76px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 200;
      background: var(--surface);
      border: 1px solid var(--accent);
      border-radius: 12px;
      padding: 10px 20px;
      font-size: 0.85rem;
      box-shadow: 0 8px 32px rgba(0,0,0,0.3);
      animation: slideDown 0.3s ease;
      white-space: nowrap;
    }
    #clipboard-toast.visible { display: flex; align-items: center; gap: 8px; }
    @keyframes slideDown { from { opacity:0; transform: translateX(-50%) translateY(-10px); } to { opacity:1; transform: translateX(-50%) translateY(0); } }

    /* ── MAIN CARD ── */
    .card {
      position: relative;
      z-index: 1;
      max-width: 720px;
      margin: 0 auto;
      padding: 0 20px 100px;
    }

    .input-box {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 28px;
      box-shadow: 0 0 60px var(--glow);
      transition: box-shadow 0.3s;
    }
    .input-box:focus-within {
      box-shadow: 0 0 80px var(--glow), 0 0 0 1px var(--accent);
      border-color: var(--accent);
    }

    .url-row {
      display: flex;
      gap: 12px;
      margin-bottom: 24px;
    }
    .url-input {
      flex: 1;
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 14px 18px;
      font-family: 'DM Sans', sans-serif;
      font-size: 0.95rem;
      color: var(--text);
      outline: none;
      transition: border 0.2s;
    }
    .url-input::placeholder { color: var(--muted); }
    .url-input:focus { border-color: var(--accent); }

    .fetch-btn {
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      border: none;
      border-radius: 12px;
      padding: 14px 24px;
      color: #fff;
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 0.95rem;
      cursor: pointer;
      white-space: nowrap;
      transition: opacity 0.2s, transform 0.15s;
    }
    .fetch-btn:hover { opacity: 0.9; transform: translateY(-1px); }
    .fetch-btn:active { transform: translateY(0); }
    .fetch-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

    /* ── FORMAT TABS ── */
    .format-tabs {
      display: flex;
      gap: 8px;
      margin-bottom: 20px;
    }
    .tab {
      flex: 1;
      padding: 11px 6px;
      border-radius: 10px;
      border: 1px solid var(--border);
      background: var(--surface2);
      color: var(--muted);
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 0.78rem;
      cursor: pointer;
      transition: all 0.2s;
      text-align: center;
      white-space: nowrap;
    }
    .tab.active {
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      color: #fff;
      border-color: transparent;
    }

    /* ── QUALITY ── */
    .quality-label {
      font-size: 0.78rem;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 12px;
      font-weight: 500;
    }
    .quality-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }
    .quality-chip {
      padding: 8px 18px;
      border-radius: 50px;
      border: 1px solid var(--border);
      background: var(--surface2);
      color: var(--muted);
      font-size: 0.82rem;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.2s;
    }
    .quality-chip:hover { border-color: var(--accent); color: var(--accent); }
    .quality-chip.selected {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }

    /* ── VIDEO PREVIEW ── */
    #preview-box {
      display: none;
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 18px;
      margin-bottom: 20px;
      flex-direction: row;
      gap: 16px;
      align-items: center;
    }
    #preview-box.visible { display: flex; }
    #preview-thumb {
      width: 110px;
      height: 70px;
      object-fit: cover;
      border-radius: 8px;
      flex-shrink: 0;
      background: var(--border);
    }
    #preview-title { font-weight: 500; font-size: 0.92rem; line-height: 1.4; }
    #preview-meta { color: var(--muted); font-size: 0.78rem; margin-top: 4px; }

    /* ── DOWNLOAD BTN ── */
    .download-btn {
      width: 100%;
      padding: 16px;
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      border: none;
      border-radius: 14px;
      color: #fff;
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: 1rem;
      letter-spacing: 0.3px;
      cursor: pointer;
      transition: opacity 0.2s, transform 0.15s;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }
    .download-btn:hover { opacity: 0.9; transform: translateY(-1px); }
    .download-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

    /* ── RATE LIMIT BANNER ── */
    #rate-limit-banner {
      display: none;
      background: rgba(251,191,36,0.1);
      border: 1px solid var(--warn);
      border-radius: 10px;
      padding: 10px 16px;
      font-size: 0.82rem;
      color: var(--warn);
      margin-bottom: 16px;
      text-align: center;
    }
    #rate-limit-banner.visible { display: block; }

    /* ── PROGRESS ── */
    #progress-wrap {
      display: none;
      margin-top: 18px;
    }
    #progress-wrap.visible { display: block; }
    .progress-bar-bg {
      background: var(--surface2);
      border-radius: 50px;
      height: 6px;
      overflow: hidden;
      margin-bottom: 8px;
    }
    .progress-bar-fill {
      height: 100%;
      width: 0%;
      background: linear-gradient(90deg, var(--accent), var(--accent2));
      border-radius: 50px;
      transition: width 0.4s ease;
    }
    .progress-text {
      font-size: 0.78rem;
      color: var(--muted);
      text-align: center;
    }

    /* ── STATUS ── */
    #status-msg {
      margin-top: 14px;
      font-size: 0.85rem;
      text-align: center;
      min-height: 20px;
      color: var(--muted);
    }
    #status-msg.error   { color: var(--error); }
    #status-msg.success { color: var(--success); }

    /* ── PLAYLIST ── */
    #playlist-section { display: none; margin-top: 28px; }
    #playlist-section.visible { display: block; }

    .playlist-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      flex-wrap: wrap;
      gap: 10px;
    }
    .playlist-title { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 1rem; }
    .playlist-count { color: var(--muted); font-size: 0.8rem; }
    .playlist-actions { display: flex; gap: 8px; flex-wrap: wrap; }

    .pl-btn {
      padding: 8px 16px;
      border-radius: 8px;
      border: 1px solid var(--border);
      background: var(--surface2);
      color: var(--text);
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 0.78rem;
      cursor: pointer;
      transition: all 0.2s;
    }
    .pl-btn:hover { border-color: var(--accent); color: var(--accent); }
    .pl-btn.primary {
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      border-color: transparent;
      color: #fff;
    }
    .pl-btn.primary:hover { opacity: 0.9; color: #fff; }
    .pl-btn:disabled { opacity: 0.4; cursor: not-allowed; }

    .playlist-grid {
      display: flex;
      flex-direction: column;
      gap: 8px;
      max-height: 400px;
      overflow-y: auto;
      padding-right: 4px;
    }
    .playlist-grid::-webkit-scrollbar { width: 4px; }
    .playlist-grid::-webkit-scrollbar-track { background: var(--surface2); border-radius: 4px; }
    .playlist-grid::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }

    .pl-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 12px;
      border-radius: 10px;
      border: 1px solid var(--border);
      background: var(--surface2);
      cursor: pointer;
      transition: all 0.15s;
      user-select: none;
    }
    .pl-item:hover { border-color: var(--accent); }
    .pl-item.selected { border-color: var(--accent); background: rgba(255,60,110,0.08); }
    .pl-item.downloading { opacity: 0.5; cursor: default; }
    .pl-item.done { border-color: var(--success); background: rgba(74,222,128,0.07); }
    .pl-item.error-item { border-color: var(--error); background: rgba(255,77,109,0.07); }

    .pl-check {
      width: 18px; height: 18px;
      border-radius: 5px;
      border: 2px solid var(--border);
      flex-shrink: 0;
      display: flex; align-items: center; justify-content: center;
      font-size: 11px;
      transition: all 0.15s;
    }
    .pl-item.selected .pl-check { background: var(--accent); border-color: var(--accent); color: #fff; }
    .pl-item.done .pl-check { background: var(--success); border-color: var(--success); color: #fff; }

    .pl-thumb { width: 80px; height: 50px; object-fit: cover; border-radius: 6px; flex-shrink: 0; background: var(--border); }
    .pl-info { flex: 1; min-width: 0; }
    .pl-video-title { font-size: 0.83rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.3; }
    .pl-channel { font-size: 0.72rem; color: var(--muted); margin-top: 2px; }
    .pl-num { font-size: 0.72rem; color: var(--muted); flex-shrink: 0; width: 20px; text-align: right; }
    .pl-status { font-size: 0.7rem; flex-shrink: 0; width: 60px; text-align: right; color: var(--muted); }
    .pl-status.ok  { color: var(--success); }
    .pl-status.err { color: var(--error); }

    .playlist-progress-wrap { margin-top: 14px; display: none; }
    .playlist-progress-wrap.visible { display: block; }
    .pl-overall-text { font-size: 0.8rem; color: var(--muted); margin-bottom: 6px; text-align: center; }

    /* ── FEATURES ── */
    .features {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 16px;
      max-width: 720px;
      margin: 0 auto;
      padding: 0 20px 60px;
    }
    .feat {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 22px;
      transition: border-color 0.2s;
    }
    .feat:hover { border-color: var(--accent); }
    .feat-icon { font-size: 1.6rem; margin-bottom: 10px; }
    .feat-title { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 0.92rem; margin-bottom: 6px; }
    .feat-desc { color: var(--muted); font-size: 0.8rem; line-height: 1.5; }

    /* ── LEGAL ── */
    .legal-section {
      position: relative;
      z-index: 1;
      max-width: 720px;
      margin: 0 auto;
      padding: 0 20px 60px;
    }
    .legal-box {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 24px 28px;
    }
    .legal-box h2 {
      font-family: 'Syne', sans-serif;
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--muted);
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .legal-box p {
      font-size: 0.82rem;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 10px;
    }
    .legal-box p:last-child { margin-bottom: 0; }
    .legal-box strong { color: var(--text); }

    /* ── FOOTER ── */
    footer {
      text-align: center;
      padding: 24px 20px;
      color: var(--muted);
      font-size: 0.78rem;
      border-top: 1px solid var(--border);
      position: relative;
      z-index: 1;
    }
    footer a { color: var(--accent); text-decoration: none; }
    footer a:hover { text-decoration: underline; }

    /* ── SPINNER ── */
    .spinner {
      width: 18px; height: 18px;
      border: 2px solid rgba(255,255,255,0.3);
      border-top-color: #fff;
      border-radius: 50%;
      animation: spin 0.7s linear infinite;
      display: none;
    }
    .spinner.active { display: inline-block; }
    @keyframes spin { to { transform: rotate(360deg); } }

    /* ── RESPONSIVE ── */
    @media (max-width: 540px) {
      nav { padding: 16px 20px; }
      .url-row { flex-direction: column; }
      .fetch-btn { width: 100%; }
      #preview-box { flex-direction: column; align-items: flex-start; }
      #preview-thumb { width: 100%; height: 160px; }
      .format-tabs { flex-wrap: wrap; }
    }