.metronome-stage {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 1.5rem;
      padding: 1.5rem 0;
    }
    .beat-indicator {
      width: 120px;
      height: 120px;
      border-radius: 50%;
      background: var(--bg-surface-subtle);
      border: 3px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      font-weight: 800;
      color: var(--text-muted);
      transition: background 0.05s ease, border-color 0.05s ease, transform 0.05s ease;
      user-select: none;
    }
    .beat-indicator.beat-accent {
      background: var(--primary);
      border-color: var(--primary);
      color: var(--text-inverse);
      transform: scale(1.08);
    }
    .beat-indicator.beat-normal {
      background: var(--accent-emerald-light);
      border-color: var(--accent-emerald);
      color: var(--accent-emerald);
      transform: scale(1.04);
    }
    .bpm-display {
      font-size: clamp(3.5rem, 12vw, 6rem);
      font-weight: 900;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      color: var(--text-primary);
      letter-spacing: -0.04em;
      line-height: 1;
      user-select: none;
    }
    .bpm-label {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-muted);
    }
    .bpm-controls {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .bpm-adj-btn {
      width: 3.25rem;
      height: 3.25rem;
      border-radius: var(--radius-full);
      border: 2px solid var(--border-color);
      border-bottom: 3px solid var(--border-strong);
      background: var(--bg-surface);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all var(--transition-fast);
      box-shadow: 0 2px 0 var(--border-color);
    }
    .bpm-adj-btn:hover {
      transform: translateY(-1px);
      box-shadow: 0 3px 0 var(--border-strong);
      border-color: var(--border-strong);
    }
    .bpm-adj-btn:active {
      transform: translateY(2px);
      box-shadow: none;
    }
    .bpm-slider-wrap {
      width: 100%;
      max-width: 480px;
    }
    .bpm-slider {
      -webkit-appearance: none;
      width: 100%;
      height: 6px;
      border-radius: 3px;
      background: var(--border-color);
      outline: none;
      cursor: pointer;
    }
    .bpm-slider::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 2px 6px rgba(0,0,0,0.2);
      cursor: pointer;
    }
    .time-sig-row {
      display: flex;
      gap: 0.6rem;
      flex-wrap: wrap;
      justify-content: center;
    }
    .beat-dots {
      display: flex;
      gap: 0.5rem;
      margin-top: 0.5rem;
    }
    .beat-dot {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--border-color);
      transition: background 0.07s ease, transform 0.07s ease;
    }
    .beat-dot.active-accent {
      background: var(--primary);
      transform: scale(1.3);
    }
    .beat-dot.active-normal {
      background: var(--accent-emerald);
      transform: scale(1.15);
    }
    .volume-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      width: 100%;
      max-width: 360px;
    }
    .vol-label {
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--text-muted);
      white-space: nowrap;
    }
    .vol-slider {
      -webkit-appearance: none;
      flex: 1;
      height: 5px;
      border-radius: 3px;
      background: var(--border-color);
      outline: none;
      cursor: pointer;
    }
    .vol-slider::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: var(--accent-emerald);
      cursor: pointer;
    }