.custom-timer-config {
      width: 100%;
      max-width: 640px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }
    .config-row {
      display: flex;
      flex-direction: column;
      gap: 0.4rem;
    }
    .config-label {
      font-size: 0.8rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.07em;
      color: var(--text-muted);
    }
    .config-input {
      width: 100%;
      padding: 0.7rem 1rem;
      border: 1px solid var(--border-color);
      border-bottom: 2px solid var(--border-strong);
      border-radius: var(--radius-md);
      background: var(--bg-surface);
      color: var(--text-primary);
      font-size: 1rem;
      font-weight: 600;
      font-family: inherit;
      transition: border-color var(--transition-fast);
    }
    .config-input:focus {
      outline: none;
      border-color: var(--primary);
    }
    .duration-row {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 0.75rem;
    }
    .color-swatch-row {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }
    .color-swatch {
      width: 36px;
      height: 36px;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 3px solid transparent;
      transition: transform var(--transition-fast), border-color var(--transition-fast);
    }
    .color-swatch.selected { border-color: var(--primary); transform: scale(1.15); }
    .color-swatch:hover { transform: scale(1.1); }
    .timer-run-overlay {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 500;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 1.5rem;
      transition: background 0.5s ease;
    }
    .timer-run-overlay.is-active { display: flex; }
    .timer-run-label {
      font-size: clamp(1.5rem, 5vw, 3rem);
      font-weight: 900;
      color: rgba(255,255,255,0.9);
      letter-spacing: -0.02em;
      text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    .timer-run-display {
      font-size: clamp(4rem, 16vw, 9rem);
      font-weight: 900;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      color: white;
      letter-spacing: -0.03em;
      line-height: 1;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .timer-run-controls {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      justify-content: center;
    }
    .timer-run-btn {
      padding: 0.85rem 2rem;
      border-radius: var(--radius-full);
      font-size: 1.05rem;
      font-weight: 800;
      cursor: pointer;
      border: 2px solid rgba(255,255,255,0.4);
      background: rgba(255,255,255,0.15);
      color: white;
      backdrop-filter: blur(8px);
      transition: all var(--transition-fast);
    }
    .timer-run-btn:hover { background: rgba(255,255,255,0.25); transform: translateY(-1px); }
    .timer-end-message {
      display: none;
      font-size: clamp(2rem, 8vw, 4.5rem);
      font-weight: 900;
      color: white;
      text-align: center;
      animation: endPop 0.4s ease;
    }
    @keyframes endPop {
      0% { transform: scale(0.7); opacity: 0; }
      60% { transform: scale(1.1); }
      100% { transform: scale(1); opacity: 1; }
    }