/* ============================================
   Music Player Component
   Glassmorphism, Fixed Top-Right, Category Tabs
   ============================================ */

/* --- Variables --- */
:root {
  --mp-bg: rgba(17, 17, 20, 0.65);
  --mp-bg-solid: rgba(17, 17, 20, 0.88);
  --mp-border: rgba(255, 255, 255, 0.08);
  --mp-border-hover: rgba(255, 255, 255, 0.15);
  --mp-text: #f4f4f5;
  --mp-text-secondary: #a1a1aa;
  --mp-text-muted: #52525b;
  --mp-accent: #6366f1;
  --mp-accent-glow: rgba(99, 102, 241, 0.3);
  --mp-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --mp-radius: 16px;
  --mp-radius-sm: 10px;
  --mp-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --mp-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --mp-size: 56px;
  --mp-size-expanded: 320px;
}

/* --- Player Container --- */
.mp {
  position: fixed;
  top: calc(var(--nav-height, 72px) + 16px);
  right: 24px;
  z-index: 1500;
  font-family: var(--font-sans, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif);
  -webkit-font-smoothing: antialiased;
}

/* --- Collapsed: Floating Button --- */
.mp-toggle {
  width: var(--mp-size);
  height: var(--mp-size);
  border-radius: 50%;
  background: var(--mp-bg-solid);
  border: 1px solid var(--mp-border);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.4s var(--mp-ease);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  position: relative;
  overflow: hidden;
}

.mp-toggle:hover {
  transform: scale(1.08);
  border-color: var(--mp-border-hover);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.5), 0 0 40px var(--mp-accent-glow);
}

.mp-toggle:active {
  transform: scale(0.95);
}

.mp-toggle::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--mp-accent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mp-toggle.mp-playing::before {
  opacity: 0.5;
  animation: mp-pulse-ring 2s ease-in-out infinite;
}

@keyframes mp-pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.12); opacity: 0; }
}

.mp-toggle svg {
  color: var(--mp-text);
  transition: color 0.3s ease;
  z-index: 1;
}

.mp-toggle.mp-playing svg {
  color: var(--mp-accent);
}

.mp-disc {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--mp-accent), #a855f7, #ec4899, var(--mp-accent));
  opacity: 0;
  transition: opacity 0.4s ease;
  animation: mp-disc-spin 3s linear infinite paused;
}

.mp-toggle.mp-playing .mp-disc {
  opacity: 0.2;
  animation-play-state: running;
}

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

/* --- Expanded Panel --- */
.mp-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: var(--mp-size-expanded);
  background: var(--mp-bg-solid);
  border: 1px solid var(--mp-border);
  border-radius: var(--mp-radius);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  padding: 20px;
  opacity: 0;
  transform: scale(0.9) translateY(-10px);
  pointer-events: none;
  transition: all 0.35s var(--mp-ease);
  transform-origin: top right;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}

.mp-panel.mp-open {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
}

/* --- Now Playing Info --- */
.mp-now {
  margin-bottom: 14px;
  flex-shrink: 0;
}

.mp-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--mp-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
  letter-spacing: -0.01em;
}

.mp-artist {
  font-size: 0.7rem;
  color: var(--mp-text-muted);
  font-weight: 500;
}

/* --- Progress Bar --- */
.mp-progress-wrap {
  margin-bottom: 14px;
  flex-shrink: 0;
}

.mp-progress-bar {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.mp-progress-bar:hover {
  height: 6px;
}

.mp-progress-fill {
  height: 100%;
  background: var(--mp-gradient);
  border-radius: 4px;
  width: 0%;
  transition: width 0.1s linear;
  position: relative;
}

.mp-progress-fill::after {
  content: '';
  position: absolute;
  right: -5px;
  top: 50%;
  transform: translateY(-50%) scale(0);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 8px var(--mp-accent-glow);
  transition: transform 0.2s var(--mp-ease-spring);
}

.mp-progress-bar:hover .mp-progress-fill::after {
  transform: translateY(-50%) scale(1);
}

.mp-time {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--mp-text-muted);
  margin-top: 6px;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
}

/* --- Controls Row --- */
.mp-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 14px;
  flex-shrink: 0;
}

.mp-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--mp-text-secondary);
  transition: all 0.25s var(--mp-ease);
  flex-shrink: 0;
}

.mp-btn:hover {
  color: var(--mp-text);
  background: rgba(255, 255, 255, 0.08);
  transform: scale(1.1);
}

.mp-btn:active {
  transform: scale(0.9);
}

.mp-btn-play {
  width: 44px;
  height: 44px;
  background: var(--mp-gradient);
  color: #fff;
  box-shadow: 0 2px 16px var(--mp-accent-glow);
}

.mp-btn-play:hover {
  color: #fff;
  background: var(--mp-gradient);
  box-shadow: 0 4px 24px var(--mp-accent-glow);
  transform: scale(1.1);
}

/* Shuffle & Loop buttons */
.mp-btn-shuffle,
.mp-btn-loop {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--mp-text-muted);
  transition: all 0.25s var(--mp-ease);
  flex-shrink: 0;
}

.mp-btn-shuffle:hover,
.mp-btn-loop:hover {
  color: var(--mp-text-secondary);
  background: rgba(255, 255, 255, 0.05);
  transform: scale(1.1);
}

.mp-btn-shuffle:active,
.mp-btn-loop:active {
  transform: scale(0.9);
}

.mp-btn-shuffle.mp-active {
  color: var(--mp-accent);
  background: rgba(99, 102, 241, 0.1);
}

.mp-btn-loop.mp-active {
  color: var(--mp-accent);
  background: rgba(99, 102, 241, 0.1);
}

.mp-btn-loop.mp-loop-one {
  position: relative;
}

.mp-btn-loop.mp-loop-one::after {
  content: '1';
  position: absolute;
  top: -1px;
  right: -1px;
  font-size: 0.5rem;
  font-weight: 800;
  background: var(--mp-accent);
  color: #fff;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* --- Volume Row --- */
.mp-volume-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-shrink: 0;
}

.mp-volume-icon {
  color: var(--mp-text-muted);
  flex-shrink: 0;
  cursor: pointer;
  transition: color 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mp-volume-icon:hover {
  color: var(--mp-text);
}

.mp-volume-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}

.mp-volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--mp-accent);
  box-shadow: 0 0 8px var(--mp-accent-glow);
  cursor: pointer;
  transition: transform 0.2s var(--mp-ease-spring);
}

.mp-volume-slider::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

.mp-volume-slider::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--mp-accent);
  box-shadow: 0 0 8px var(--mp-accent-glow);
  border: none;
  cursor: pointer;
}

/* ============================================
   CATEGORY TABS
   ============================================ */
.mp-categories {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--mp-radius-sm);
  margin-bottom: 12px;
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.mp-categories::-webkit-scrollbar {
  display: none;
}

.mp-cat-tab {
  flex: 1;
  min-width: 0;
  padding: 8px 6px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--mp-text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s var(--mp-ease);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  white-space: nowrap;
}

.mp-cat-tab:hover {
  color: var(--mp-text-secondary);
  background: rgba(255, 255, 255, 0.05);
}

.mp-cat-tab.mp-cat-active {
  color: var(--mp-text);
  background: rgba(99, 102, 241, 0.15);
}

.mp-cat-icon {
  font-size: 1rem;
  line-height: 1;
}

.mp-cat-name {
  font-size: 0.6rem;
  letter-spacing: 0.02em;
}

/* Category count badge */
.mp-cat-count {
  font-size: 0.55rem;
  color: var(--mp-text-muted);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
}

.mp-cat-tab.mp-cat-active .mp-cat-count {
  color: var(--mp-accent);
}

/* ============================================
   PLAYLIST
   ============================================ */
.mp-playlist {
  flex: 1;
  min-height: 0;
  max-height: 180px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--mp-text-muted) transparent;
}

.mp-playlist::-webkit-scrollbar {
  width: 4px;
}

.mp-playlist::-webkit-scrollbar-thumb {
  background: var(--mp-text-muted);
  border-radius: 2px;
}

.mp-playlist-label {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mp-text-muted);
  margin-bottom: 8px;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mp-playlist-count {
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}

/* Empty state */
.mp-playlist-empty {
  text-align: center;
  padding: 24px 16px;
  color: var(--mp-text-muted);
  font-size: 0.8rem;
}

.mp-playlist-empty-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
  opacity: 0.5;
}

.mp-playlist-empty-text {
  font-size: 0.75rem;
  line-height: 1.5;
}

/* Playlist items */
.mp-playlist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--mp-radius-sm);
  cursor: pointer;
  transition: all 0.2s var(--mp-ease);
}

.mp-playlist-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.mp-playlist-item.mp-active {
  background: rgba(99, 102, 241, 0.12);
}

.mp-playlist-item.mp-active .mp-pl-title {
  color: var(--mp-accent);
  font-weight: 600;
}

.mp-playlist-item.mp-active .mp-pl-artist {
  color: rgba(99, 102, 241, 0.6);
}

.mp-pl-index {
  font-size: 0.65rem;
  color: var(--mp-text-muted);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  min-width: 16px;
  text-align: center;
}

.mp-pl-bars {
  display: none;
  align-items: flex-end;
  gap: 1.5px;
  height: 12px;
}

.mp-playlist-item.mp-active .mp-pl-bars {
  display: flex;
}

.mp-playlist-item.mp-active .mp-pl-index-num {
  display: none;
}

.mp-pl-bar {
  width: 2px;
  background: var(--mp-accent);
  border-radius: 1px;
  animation: mp-bar-dance 0.8s ease-in-out infinite alternate;
}

.mp-pl-bar:nth-child(1) { height: 40%; animation-delay: 0s; }
.mp-pl-bar:nth-child(2) { height: 70%; animation-delay: 0.15s; }
.mp-pl-bar:nth-child(3) { height: 50%; animation-delay: 0.3s; }

@keyframes mp-bar-dance {
  0% { height: 30%; }
  100% { height: 100%; }
}

.mp-pl-title {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--mp-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  transition: color 0.2s ease;
}

/* --- Playlist item info (title + artist) --- */
.mp-pl-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.mp-pl-artist {
  font-size: 0.68rem;
  color: var(--mp-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s ease;
}

/* --- Mobile --- */
@media (max-width: 768px) {
  .mp {
    top: auto;
    bottom: 20px;
    right: 16px;
  }

  .mp-panel {
    position: fixed;
    bottom: calc(var(--mp-size) + 16px);
    right: 16px;
    top: auto;
    width: calc(100vw - 32px);
    max-width: 340px;
    max-height: 80vh;
  }

  .mp-categories {
    gap: 2px;
    padding: 3px;
  }

  .mp-cat-tab {
    padding: 6px 4px;
  }

  .mp-cat-icon {
    font-size: 0.9rem;
  }

  .mp-cat-name {
    font-size: 0.55rem;
  }
}

@media (max-width: 480px) {
  .mp-panel {
    width: calc(100vw - 32px);
    right: 16px;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .mp-toggle,
  .mp-panel,
  .mp-btn,
  .mp-progress-fill,
  .mp-disc {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }

  .mp-toggle::before {
    animation: none !important;
  }
}