.tracks-panel {
  width: var(--tracks-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-subtle);
  overflow: hidden;
}

.tracks-panel__header {
  height: var(--ruler-height);
  display: flex;
  align-items: center;
  padding: 0 12px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.tracks-panel__title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}

.tracks-panel__list {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.track-header {
  flex: 1 1 0;
  min-height: var(--track-min-height);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(6px, 1.5vh, 10px) 10px;
  gap: clamp(4px, 0.8vh, 6px);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-track);
  transition: background var(--transition-fast);
}

.track-header:last-child {
  border-bottom: none;
}

.track-header:hover {
  background: var(--bg-track-hover);
}

.track-header--reference {
  border-left: 3px solid var(--track-ref-accent);
  background: linear-gradient(90deg, var(--track-ref-bg) 0%, var(--bg-track) 40%);
}

.track-header--overdub-1 {
  border-left: 3px solid var(--track-od1-accent);
  background: linear-gradient(90deg, var(--track-od1-bg) 0%, var(--bg-track) 40%);
}

.track-header--overdub-2 {
  border-left: 3px solid var(--track-od2-accent);
  background: linear-gradient(90deg, var(--track-od2-bg) 0%, var(--bg-track) 40%);
}

.track-header--overdub-3 {
  border-left: 3px solid var(--track-od3-accent);
  background: linear-gradient(90deg, var(--track-od3-bg) 0%, var(--bg-track) 40%);
}

.track-header--overdub-4 {
  border-left: 3px solid var(--track-od4-accent);
  background: linear-gradient(90deg, var(--track-od4-bg) 0%, var(--bg-track) 40%);
}

.track-header--overdub.track-header--armed {
  box-shadow: inset 0 0 0 1px rgba(239, 68, 68, 0.25);
  background: linear-gradient(90deg, rgba(239, 68, 68, 0.1) 0%, var(--bg-track) 50%) !important;
}

.track-header--drop-target {
  background: rgba(59, 130, 246, 0.12) !important;
  box-shadow: inset 0 0 0 2px rgba(96, 165, 250, 0.65);
  transition: background 80ms ease, box-shadow 80ms ease;
}

.track-header--drop-invalid {
  background: rgba(239, 68, 68, 0.08) !important;
  box-shadow: inset 0 0 0 2px rgba(248, 113, 113, 0.55);
  transition: background 80ms ease, box-shadow 80ms ease;
}

.track-header--drop-source {
  opacity: 0.5;
  transition: opacity 80ms ease;
}

.track-header--overdub.track-header--capturing {
  box-shadow: inset 0 0 0 2px rgba(239, 68, 68, 0.55);
  animation: track-capturing 1s ease-in-out infinite;
}

@keyframes track-capturing {
  0%, 100% { background-color: rgba(239, 68, 68, 0.12); }
  50% { background-color: rgba(239, 68, 68, 0.22); }
}

.track-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.track-header__name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.track-header__controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.track-btn {
  width: 26px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.05em;
  background: var(--bg-panel-raised);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.track-btn:hover {
  border-color: var(--border-medium);
  color: var(--text-secondary);
}

.track-btn--arm {
  color: var(--accent-arm);
  border-color: rgba(239, 68, 68, 0.35);
  box-shadow: 0 0 0 1px rgba(239, 68, 68, 0.1);
}

.track-btn--arm:hover {
  border-color: var(--accent-arm);
  color: var(--accent-arm);
  background: rgba(239, 68, 68, 0.1);
}

.track-btn--arm.track-btn--active {
  background: rgba(239, 68, 68, 0.2);
  border-color: var(--accent-arm);
  color: var(--accent-arm);
  box-shadow: 0 0 0 1px var(--accent-arm);
}

.track-btn--mute.track-btn--active {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--accent-mute);
  color: var(--accent-mute);
}

.track-btn--import,
.track-btn--clear {
  width: auto;
  padding: 0 8px;
  font-size: 9px;
}

.track-btn--import:hover {
  color: var(--accent-selection);
  border-color: var(--accent-selection);
}

.track-btn--clear:hover:not(:disabled) {
  color: var(--accent-rec);
  border-color: var(--accent-rec);
}

.track-btn--clear:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.track-header__meter {
  display: none;
  align-items: center;
  gap: 6px;
}

.track-header__meter--visible {
  display: flex;
}

.track-header__meter-label {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  width: 14px;
  flex-shrink: 0;
}

.track-header__meter-track {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  position: relative;
}

.track-header__meter-fill {
  height: 100%;
  width: 0%;
  border-radius: 2px;
  background: linear-gradient(90deg, #22c55e 0%, #84cc16 55%, #eab308 78%, #ef4444 100%);
  transition: width 48ms linear;
  will-change: width;
}

.track-header__meter-fill--warn {
  filter: brightness(1.08);
}

.track-header__meter-fill--hot {
  filter: brightness(1.2) saturate(1.15);
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.45);
}

.track-header--overdub-1 .track-header__meter-fill {
  background: linear-gradient(90deg, rgba(249, 115, 22, 0.55) 0%, #f97316 100%);
}

.track-header--overdub-2 .track-header__meter-fill {
  background: linear-gradient(90deg, rgba(234, 179, 8, 0.55) 0%, #eab308 100%);
}

.track-header--overdub-3 .track-header__meter-fill {
  background: linear-gradient(90deg, rgba(34, 197, 94, 0.55) 0%, #22c55e 100%);
}

.track-header--overdub-4 .track-header__meter-fill {
  background: linear-gradient(90deg, rgba(168, 85, 247, 0.55) 0%, #a855f7 100%);
}

.track-header__bottom {
  display: flex;
  align-items: center;
  gap: 8px;
}

.track-header__vol-label {
  font-size: 9px;
  font-weight: 600;
  color: var(--text-muted);
  width: 20px;
  flex-shrink: 0;
}

.track-header__vol {
  flex: 1;
  min-width: 0;
}

.track-header__vol-value {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  width: 28px;
  text-align: right;
  flex-shrink: 0;
}

.track-header__waveform-mini {
  height: 24px;
  border-radius: 3px;
  overflow: hidden;
  background: var(--bg-input);
  display: none;
}

.track-header__waveform-mini--visible {
  display: block;
}

.track-header__file-input {
  display: none;
}