/* ─────────────────────────────────────────────────────────────────
   Tracks Page — Hub view (rails on top + virtualized browse below)
   ──────────────────────────────────────────────────────────────── */

.tracks-page {
  display: flex;
  flex-direction: column;
  gap: var(--space-6, 1.5rem);
  padding-bottom: var(--space-8, 2rem);
}

.tracks-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
}

.tracks-subtitle {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ─── Hero ────────────────────────────────────────────────────── */

.tracks-hero {
  display: flex;
  gap: var(--space-5, 1.25rem);
  padding: var(--space-4);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.tracks-hero-cover {
  flex: 0 0 160px;
  width: 160px;
  height: 160px;
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  background: var(--bg-hover);
  box-shadow: var(--shadow-md);
}

.tracks-hero-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tracks-hero-cover-placeholder {
  width: 100%;
  height: 100%;
}

.tracks-hero-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}

.tracks-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.tracks-hero-title {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tracks-hero-meta {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tracks-hero-meta-dot {
  margin: 0 8px;
  opacity: 0.5;
}

.tracks-hero-actions {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tracks-hero-actions .btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ─── Spinner helper ──────────────────────────────────────────── */

@keyframes tracks-spin {
  to { transform: rotate(360deg); }
}

.is-spinning {
  animation: tracks-spin 1s linear infinite;
  transform-origin: center;
}

/* ─── Song Rail (mirrors album-row pattern) ───────────────────── */

.song-row-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
}

.song-row-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.song-row-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.song-row-nav .nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.song-row-nav .nav-btn:hover:not(.disabled):not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border);
}

.song-row-nav .nav-btn.disabled,
.song-row-nav .nav-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.song-grid-wrapper {
  position: relative;
}

.song-grid {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* Keep off-screen rail cards out of paint/compositing work. */
.song-grid .song-card {
  content-visibility: auto;
  contain-intrinsic-size: 0 190px;
}

.song-grid::-webkit-scrollbar {
  display: none;
}

.song-row-empty {
  font-size: 13px;
  color: var(--text-muted);
  padding: var(--space-3) 0;
}

/* ─── Song Card ───────────────────────────────────────────────── */

.song-card {
  position: relative;
  flex: 0 0 140px;
  width: 140px;
  cursor: pointer;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: inset 0 0 0 1px var(--border-subtle);
  transition: box-shadow var(--transition-base);
}

.song-card:hover {
  box-shadow: inset 0 0 0 1px var(--border), var(--shadow-md);
}

.song-card-cover {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--bg-hover);
}

.song-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.song-card-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.song-card-play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.song-card:hover .song-card-play-overlay {
  opacity: 1;
}

.song-card-action-btn {
  background: var(--accent);
  color: var(--ctp-crust);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full, 999px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.song-card-action-btn:hover {
  transform: scale(1.08);
}

.song-card-info {
  padding: var(--space-2) var(--space-3) var(--space-3);
}

.song-card-title {
  font-weight: 600;
  font-size: 12px;
  color: var(--text-primary);
  margin: 0 0 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-card-artist {
  margin: 0;
  font-size: 11px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-card-rating {
  display: flex;
  gap: 2px;
  color: var(--accent);
  margin-top: 4px;
  line-height: 1;
}

/* ─── Virtual Song List ───────────────────────────────────────── */

.virtual-song-list-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.virtual-song-list-title {
  margin: 0;
}

.virtual-song-list-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: space-between;
}

.virtual-song-list-search {
  position: relative;
  flex: 1;
  max-width: 480px;
  display: flex;
  align-items: center;
}

.virtual-song-list-search-icon {
  position: absolute;
  left: 10px;
  color: var(--text-muted);
  pointer-events: none;
}

.virtual-song-list-search-input {
  width: 100%;
  padding-left: 34px;
  padding-right: 32px;
}

.virtual-song-list-search-clear {
  position: absolute;
  right: 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.virtual-song-list-search-clear:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.virtual-song-list-meta {
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
}


.virtual-song-list-empty {
  padding: var(--space-6, 1.5rem) var(--space-4);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
}

.virtual-song-list-scroll {
  max-height: 70vh;
  min-height: 320px;
  overflow-y: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
}

.virtual-song-list-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: var(--space-3);
  font-size: 12px;
  color: var(--text-muted);
}

/* ─ Shared SongRow (used by Tracks Hub, SearchResults, AdvancedSearch) ─ */

.song-list-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) 110px 56px;
  gap: var(--space-3);
  align-items: center;
  height: 52px;
  padding: 0 var(--space-3);
  font-size: 13px;
  cursor: default;
  transition: background var(--transition-fast);
  border-bottom: 1px solid var(--border-subtle);
}

.song-list-row:hover {
  background: var(--bg-hover);
}

.song-list-row.is-current {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}

.song-list-row.is-current .song-list-row-title {
  color: var(--accent);
}

.song-list-row--header {
  height: 36px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  cursor: default;
  background: transparent;
  border-bottom: 1px solid var(--border-subtle);
}

.song-list-row--header:hover {
  background: transparent;
}

.song-list-row-cell {
  min-width: 0;
}

.song-list-row-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.song-list-row-title {
  font-weight: 500;
  color: var(--text-primary);
}

.song-list-row-genre {
  color: var(--text-muted);
  font-size: 12px;
}

.song-list-row-duration {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  font-size: 12px;
}

.song-list-row-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.song-list-row-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.song-list-row-btn--play {
  color: var(--accent);
}

.song-list-row-btn--play:hover {
  background: var(--accent);
  color: var(--ctp-crust, #11111b);
}

.song-list-row.is-current .song-list-row-btn--play {
  color: var(--accent);
}

/* ─── Responsive ──────────────────────────────────────────────── */

@media (max-width: 700px) {
  .tracks-hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .tracks-hero-cover {
    flex: 0 0 140px;
    width: 140px;
    height: 140px;
  }

  .tracks-hero-actions {
    justify-content: center;
  }

  .song-list-row {
    grid-template-columns: 64px minmax(0, 1.5fr) minmax(0, 1fr) 56px;
  }

  .song-list-row-cell:nth-child(4),  /* album */
  .song-list-row-cell:nth-child(5) { /* genre */
    display: none;
  }
}
