/* ──────────────────────────────────────────────────────────────
   繁星 DJ Medley v5.0 — Product Polish
   高级质感表面 + 组件状态 + 布局节奏
   ────────────────────────────────────────────────────────────── */

/* ── Global surface treatment ── */
body {
  background:
    radial-gradient(ellipse at 20% 0%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(249, 115, 22, 0.04) 0%, transparent 50%),
    var(--bg-base);
}

/* ── Interactive elements ── */
.icon-btn, .refresh-btn, .back-btn, .player-back, .player-menu,
.ctrl-btn, .footer-btn, .mini-play, .mini-prev, .mini-next, .fav-btn,
.search-clear {
  transition: background var(--duration-fast) var(--ease-in-out),
              color var(--duration-fast) var(--ease-in-out),
              transform var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-in-out);
}
.icon-btn:hover, .refresh-btn:hover, .back-btn:hover,
.player-back:hover, .player-menu:hover {
  background: var(--bg-highlight);
  color: var(--text-primary);
}
.icon-btn:active, .refresh-btn:active, .back-btn:active,
.player-back:active, .player-menu:active {
  transform: scale(0.92);
}
.icon-btn, .refresh-btn, .back-btn, .player-back, .player-menu {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
}
.icon-btn.spinning { animation: breathe 1.5s ease-in-out infinite; }

/* ── Stat cards ── */
.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  transition: border-color var(--duration-normal) var(--ease-in-out),
              background var(--duration-normal) var(--ease-in-out);
}
.stat-card:hover {
  border-color: var(--border-default);
  background: var(--bg-elevated);
}
.stat-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-dim);
  color: var(--color-primary);
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), #7c3aed);
  color: #fff;
  font-weight: var(--weight-bold);
  font-size: var(--text-base);
  letter-spacing: 0.02em;
  transition: opacity var(--duration-fast) var(--ease-in-out),
              transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-in-out);
  min-height: 44px;
  box-shadow: 0 2px 12px rgba(139, 92, 246, 0.25);
}
.btn-primary:hover {
  opacity: 0.92;
  box-shadow: 0 4px 20px rgba(139, 92, 246, 0.35);
}
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-primary);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  border: 1px solid var(--border-strong);
  transition: background var(--duration-fast) var(--ease-in-out),
              border-color var(--duration-fast) var(--ease-in-out),
              transform var(--duration-fast) var(--ease-out);
  min-height: 44px;
}
.btn-secondary:hover {
  background: var(--bg-highlight);
  border-color: var(--color-primary);
}
.btn-secondary:active { transform: scale(0.97); }

/* ── Song cards ── */
.song-card {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-in-out);
  cursor: pointer;
  min-height: 56px;
}
.song-card:hover { background: var(--bg-highlight); }
.song-card.playing {
  background: var(--color-primary-dim);
  border-left: 2px solid var(--color-primary);
}
.song-card .cover-wrap {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}
.song-card .cover-wrap img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.song-card .song-info {
  flex: 1; min-width: 0;
}
.song-card .song-title {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  line-height: 1.3;
}
.song-card .song-artist {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.3;
}
.song-card .song-meta {
  display: flex; gap: var(--space-2); margin-top: 2px;
}
.badge-duration, .badge-source {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  background: var(--bg-surface);
  padding: 1px var(--space-2);
  border-radius: var(--radius-xs);
  line-height: 1.4;
}
.song-card .fav-btn {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
  flex-shrink: 0;
}
.song-card .fav-btn:hover { color: var(--color-accent); background: var(--bg-highlight); }
.song-card .fav-btn.active { color: var(--color-accent); }

/* ── Mini player ── */
.mini-player {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  backdrop-filter: blur(16px);
  display: flex; align-items: center;
  padding: var(--space-2) var(--space-4);
  padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom));
  z-index: var(--z-sticky);
  gap: var(--space-3);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}
.mini-cover {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}
.mini-info { flex: 1; min-width: 0; }
.mini-title {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
}
.mini-artist {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}
.mini-controls { display: flex; gap: var(--space-2); align-items: center; }
.mini-play, .mini-prev, .mini-next {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
}
.mini-play:hover, .mini-prev:hover, .mini-next:hover {
  color: var(--text-primary);
  background: var(--bg-highlight);
}
.mini-play {
  background: var(--color-primary);
  color: #fff;
}
.mini-play:hover {
  background: var(--color-primary-hover);
  color: #fff;
}

/* ── Search ── */
.search-bar {
  display: flex; align-items: center; gap: var(--space-2);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  transition: border-color var(--duration-fast) var(--ease-in-out);
}
.search-bar:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-dim);
}
.search-input {
  flex: 1; background: none; border: none;
  font-size: var(--text-base); color: var(--text-primary);
  outline: none;
}
.search-input::placeholder { color: var(--text-tertiary); }
.search-icon { color: var(--text-tertiary); display: flex; flex-shrink: 0; }
.search-clear {
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-tertiary);
}
.search-clear:hover { background: var(--bg-highlight); color: var(--text-primary); }

/* ── Skeleton loading ── */
.skeleton-item {
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(90deg, var(--bg-surface) 25%, var(--bg-highlight) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  margin-bottom: var(--space-2);
}

/* ── Playing indicator ── */
.playing-indicator {
  display: none; gap: 2px; align-items: flex-end; height: 14px;
}
.song-card.playing .playing-indicator { display: flex; }
.song-card.playing .song-index { display: none; }
.playing-indicator .bar {
  width: 3px;
  background: var(--color-primary);
  border-radius: 1px;
  animation: breathe 0.8s ease-in-out infinite;
}
.playing-indicator .bar:nth-child(2) { animation-delay: 0.2s; height: 10px; }
.playing-indicator .bar:nth-child(3) { animation-delay: 0.4s; }

/* ── Empty state ── */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
  color: var(--text-tertiary);
}
.empty-icon { margin-bottom: var(--space-4); opacity: 0.5; }
.empty-text {
  font-size: var(--text-md);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-1);
}
.empty-sub { font-size: var(--text-base); color: var(--text-tertiary); }
.btn-goto-list {
  display: inline-flex; align-items: center; gap: var(--space-1);
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary-dim);
  color: var(--color-primary);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
}

/* ── About modal ── */
.about-version {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  text-align: center;
  margin-bottom: var(--space-3);
  font-weight: var(--weight-medium);
}
.about-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: var(--space-3) 0;
}
.about-feature {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.5;
}
.af-icon {
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 2px;
}
.about-author {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-3);
  font-weight: var(--weight-medium);
}

/* ── Settings panel ── */
.settings-panel {
  position: fixed;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2) 0;
  z-index: var(--z-overlay);
  min-width: 320px;
  max-width: min(92vw, 400px);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: none;
  box-shadow: var(--shadow-xl);
}
.settings-panel.active { display: block; animation: fadeIn var(--duration-fast) var(--ease-out); }
.settings-header {
  padding: var(--space-3) var(--space-4) var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-1);
}
.settings-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-in-out);
  font-size: var(--text-base);
}
.settings-item:hover { background: var(--bg-highlight); }
.settings-icon { color: var(--text-tertiary); display: flex; flex-shrink: 0; }
.settings-val {
  margin-left: auto;
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  font-weight: var(--weight-medium);
}
.settings-val.active { color: var(--color-primary); }

/* ── Fav count badge ── */
.fav-count-badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 24px; height: 24px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .settings-panel { right: var(--space-3); left: auto; }
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}