/**
 * cards.css - Card Component Styles
 * Song cards, album cards, and content cards
 */

/* ==========================================================================
   BASE CARD STYLES
   ========================================================================== */

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: var(--transition-all);
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-hover);
  border-color: var(--border-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   SONG CARD
   ========================================================================== */

.song-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-all);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
}

.song-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

/* Cover Image */
.song-cover {
  width: 100%;
  aspect-ratio: 1;
  background: var(--bg-tertiary);
  position: relative;
  overflow: hidden;
}

.song-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow);
}

.song-card:hover .song-cover img {
  transform: scale(1.05);
}

.song-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-4xl);
  color: var(--text-tertiary);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

/* Play Overlay */
.song-play-overlay {
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration-normal);
}

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

.song-play-btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--button-primary-bg);
  color: var(--text-inverse);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transform: scale(0.8);
  transition: var(--transition-transform);
}

.song-card:hover .song-play-btn {
  transform: scale(1);
}

.song-play-btn:hover {
  transform: scale(1.1) !important;
  box-shadow: var(--shadow-primary);
}

.song-play-btn:active {
  transform: scale(0.95) !important;
}

/* Song Info */
.song-info {
  padding: var(--space-3);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.song-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-artist {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-2);
}

.song-duration {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.song-genre {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  padding: var(--space-1) var(--space-2);
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}

/* Song Actions */
.song-actions {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: flex;
  gap: var(--space-1);
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.song-card:hover .song-actions {
  opacity: 1;
}

.song-action-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-primary);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-all);
}

.song-action-btn:hover {
  background: var(--bg-primary);
  transform: scale(1.1);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ==========================================================================
   ALBUM CARD
   ========================================================================== */

.album-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: var(--transition-all);
  cursor: pointer;
  display: flex;
  gap: var(--space-4);
}

.album-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-lg);
  background: var(--bg-hover);
}

.album-artwork {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-tertiary);
}

.album-artwork img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.album-details {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.album-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.album-artist {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.album-stats {
  display: flex;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-top: auto;
}

.album-stat {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ==========================================================================
   ARTIST CARD
   ========================================================================== */

.artist-card {
  text-align: center;
  padding: var(--space-4);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  transition: var(--transition-all);
  cursor: pointer;
}

.artist-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  background: var(--bg-hover);
}

.artist-avatar {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-3);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.artist-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.artist-avatar-placeholder {
  font-size: var(--font-size-4xl);
  color: var(--text-inverse);
}

.artist-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.artist-genre {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

.artist-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
}

.artist-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.artist-stat-value {
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.artist-stat-label {
  color: var(--text-tertiary);
  font-size: var(--font-size-xs);
}

/* ==========================================================================
   PLAYLIST CARD
   ========================================================================== */

.playlist-card {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-all);
}

.playlist-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-xl);
}

.playlist-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
  opacity: 0.1;
  transition: opacity var(--duration-normal);
}

.playlist-card:hover::before {
  opacity: 0.2;
}

.playlist-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.playlist-description {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.playlist-meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

/* ==========================================================================
   CARD GRIDS
   ========================================================================== */

.songs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
}

.albums-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-4);
}

.artists-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
}

.playlists-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

/* ==========================================================================
   LOADING STATES
   ========================================================================== */

.card-skeleton {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.card-skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.05) 50%,
    transparent 100%
  );
  animation: skeleton-shimmer 1.5s infinite;
}

@keyframes skeleton-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.song-card-skeleton {
  height: 280px;
}

.album-card-skeleton {
  height: 150px;
}

/* ==========================================================================
   EMPTY STATES
   ========================================================================== */

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-4);
}

.empty-icon {
  font-size: var(--font-size-6xl);
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.empty-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.empty-message {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 768px) {
  .songs-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-3);
  }
  
  .albums-grid {
    grid-template-columns: 1fr;
  }
  
  .album-card {
    flex-direction: column;
    text-align: center;
  }
  
  .album-artwork {
    width: 100%;
    height: 200px;
    margin: 0 auto;
  }
  
  .artists-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
  
  .artist-avatar {
    width: 80px;
    height: 80px;
  }
}

@media (max-width: 475px) {
  .songs-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
  }
  
  .song-info {
    padding: var(--space-2);
  }
  
  .song-title {
    font-size: var(--font-size-sm);
  }
  
  .song-artist {
    font-size: var(--font-size-xs);
  }
}