/* ── Music track card ── */
.track-card {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding: var(--space-md);
  border: var(--rule-hair) solid var(--color-rule);
  background: var(--color-evidence-bg);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  transition: border-color var(--dur-micro) var(--ease-out),
              background var(--dur-micro) var(--ease-out);
}

.track-card:hover {
  border-color: var(--color-accent);
  background: oklch(6% 0.003 145);
}

.track-card__artwork {
  flex-shrink: 0;
  width: 4rem;
  height: 4rem;
  border: var(--rule-hair) solid var(--color-rule);
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.track-card__artwork img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.track-card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity var(--dur-micro) var(--ease-out);
  cursor: pointer;
}

.track-card:hover .track-card__play,
.track-card__play:focus-visible {
  opacity: 1;
}

.track-card__play:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.track-card__play-icon {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--color-phosphor);
  display: block;
  pointer-events: none;
}

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

.track-card__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-md);
  letter-spacing: var(--track-tight);
  color: var(--color-ink);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: var(--space-2xs);
}

.track-card__sub {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  color: var(--color-muted);
  display: block;
}

/* ── Audio player ── */
.track-player {
  display: block;
  width: 100%;
  margin-top: var(--space-sm);
}

/* ── Playback state feedback ── */
.track-card.playing {
  border-color: var(--color-accent);
  background: oklch(6% 0.003 145);
}

.track-card.playing .track-card__play {
  opacity: 1;
}

.track-card.playing .track-card__play-icon {
  fill: var(--color-accent);
}

/* ── Soundwave animation ── */
.soundwave {
  display: flex;
  gap: 2px;
  align-items: end;
  height: 1.25rem;
  margin-top: var(--space-xs);
  opacity: 0;
  transition: opacity var(--dur-micro) var(--ease-out);
}

.track-card.playing .soundwave {
  opacity: 1;
}

.soundwave__bar {
  display: block;
  width: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  height: 20%;
  animation: soundwave-bar var(--dur-long) ease-in-out infinite;
}

.soundwave__bar:nth-child(1) { animation-delay: 0s; }
.soundwave__bar:nth-child(2) { animation-delay: 0.15s; }
.soundwave__bar:nth-child(3) { animation-delay: 0.3s; }
.soundwave__bar:nth-child(4) { animation-delay: 0.45s; }
.soundwave__bar:nth-child(5) { animation-delay: 0.6s; }

@keyframes soundwave-bar {
  0%, 100% { height: 20%; }
  50% { height: 90%; }
}

@media (prefers-reduced-motion: reduce) {
  .soundwave__bar {
    animation: none;
    height: 50%;
  }
}