/* ---- Spotify-style timeline (UTC day) ---- */
    .spotify-timeline {
      background: linear-gradient(180deg, #1c1c26 0%, #18181f 100%);
      border-top: 1px solid var(--border);
      padding: 6px 14px 4px;
      user-select: none;
    }

    .timeline-track-area {
      position: relative;
      height: 30px;
      margin-bottom: 0;
      cursor: grab;
    }

    .timeline-rail {
      position: absolute;
      left: 0;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      height: 7px;
      border-radius: 9999px;
      background: linear-gradient(180deg, rgba(40, 44, 58, 0.9) 0%, rgba(22, 24, 34, 0.95) 100%);
      box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.45);
      pointer-events: none;
    }

    .timeline-segments-layer {
      position: absolute;
      left: 0;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      height: 10px;
      margin-top: -5px;
      z-index: 2;
    }

    .timeline-segment {
      position: absolute;
      top: 0;
      height: 100%;
      min-width: 6px;
      border-radius: 9999px;
      background: linear-gradient(180deg, #1ed760 0%, #169c46 100%);
      box-shadow:
        0 0 10px rgba(30, 215, 96, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.25);
      cursor: grab;
      pointer-events: auto;
      touch-action: none;
      transition: filter 0.12s, transform 0.12s;
    }

    .timeline-segment:hover {
      filter: brightness(1.08);
    }

    .timeline-segment:active {
      cursor: grabbing;
    }

    .timeline-range-bracket {
      position: absolute;
      top: -2px;
      bottom: -2px;
      border-radius: 9999px;
      border: 2px solid rgba(30, 215, 96, 0.85);
      background: rgba(30, 215, 96, 0.12);
      pointer-events: none;
      z-index: 3;
      display: none;
    }

    .timeline-range-bracket.visible {
      display: block;
    }

    .timeline-playhead {
      position: absolute;
      top: -2px;
      width: 2px;
      height: calc(100% + 4px);
      margin-left: -1px;
      border-radius: 1px;
      background: #2dd4bf;
      box-shadow: 0 0 8px rgba(45, 212, 191, 0.65);
      pointer-events: none;
      z-index: 4;
      transition: left 0.08s ease-out;
    }

    .timeline-progress-marker {
      position: absolute;
      top: -4px;
      width: 3px;
      height: calc(100% + 8px);
      margin-left: -1.5px;
      border-radius: 2px;
      background: #f59e0b;
      box-shadow: 0 0 8px rgba(245, 158, 11, 0.7);
      z-index: 5;
      display: none;
      cursor: help;
    }

    .timeline-progress-marker.visible {
      display: block;
    }

    .timeline-progress-fill {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      height: 10px;
      border-radius: 9999px;
      background: rgba(30, 215, 96, 0.28);
      box-shadow: 0 0 6px rgba(30, 215, 96, 0.24);
      z-index: 2;
      display: none;
      pointer-events: none;
    }

    .timeline-progress-fill.visible {
      display: block;
    }

    .timeline-progress-tooltip {
      position: absolute;
      bottom: calc(100% + 8px);
      transform: translateX(-50%);
      padding: 3px 7px;
      border-radius: 6px;
      border: 1px solid var(--border);
      background: rgba(10, 14, 22, 0.96);
      color: var(--text);
      font-size: 10px;
      white-space: nowrap;
      box-shadow: 0 6px 16px rgba(0, 0, 0, 0.35);
      z-index: 6;
      display: none;
      pointer-events: none;
    }

    .timeline-progress-tooltip.visible {
      display: block;
    }

    .timeline-axis {
      position: relative;
      min-height: 32px;
      height: auto;
      margin-top: 0;
      padding: 0 0 4px;
      box-sizing: border-box;
      cursor: grab;
      touch-action: none;
    }

    .timeline-axis.timeline-panning {
      cursor: grabbing;
      background: rgba(10, 16, 28, 0.25);
    }

    .timeline-tick {
      position: absolute;
      bottom: 0;
      transform: translateX(-50%);
      text-align: center;
      pointer-events: none;
      min-width: 1px;
    }

    .timeline-tick--major {
      z-index: 1;
    }

    .timeline-tick--major::before {
      content: '';
      position: absolute;
      bottom: 15px;
      left: 50%;
      width: 1px;
      height: 10px;
      border-radius: 1px;
      background: var(--timeline-tick-major);
      box-shadow: 0 0 4px rgba(200, 205, 240, 0.12);
      transform: translateX(-50%);
    }

    .timeline-tick--major span {
      font-size: 10px;
      font-weight: 500;
      color: #b8b8d0;
      white-space: nowrap;
      letter-spacing: 0.02em;
    }

    .timeline-tick--minor {
      z-index: 0;
    }

    .timeline-tick--minor::before {
      content: '';
      position: absolute;
      bottom: 15px;
      left: 50%;
      width: 1px;
      height: 6px;
      border-radius: 1px;
      background: var(--timeline-tick-minor);
      transform: translateX(-50%);
    }

    .playback-pill-cluster {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      flex-shrink: 0;
    }

    .pb-pill-day-arrow {
      width: 36px;
      height: 36px;
      padding: 0;
      border-radius: 999px;
      border: 1px solid rgba(200, 255, 245, 0.2);
      background: rgba(12, 18, 24, 0.55);
      color: #d4f5f0;
      font-size: 18px;
      font-weight: 500;
      line-height: 1;
      font-family: inherit;
      cursor: pointer;
      flex-shrink: 0;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.16s, border-color 0.16s, transform 0.1s, color 0.16s, box-shadow 0.16s;
    }

    .pb-pill-day-arrow:hover:not(:disabled) {
      background: rgba(20, 200, 170, 0.12);
      border-color: rgba(100, 240, 210, 0.45);
      color: #f0fffd;
      box-shadow: 0 0 12px rgba(20, 180, 150, 0.15);
    }

    .pb-pill-day-arrow:active:not(:disabled) {
      transform: scale(0.96);
    }

    .pb-pill-day-arrow:disabled {
      opacity: 0.32;
      cursor: not-allowed;
    }

    .pb-pill-day-arrow:focus-visible {
      outline: 2px solid rgba(240, 255, 252, 0.7);
      outline-offset: 2px;
    }

    .timeline-track-area.timeline-panning {
      cursor: grabbing !important;
    }