/* ========================================
   Open Music - Layout
   应用布局样式
   ======================================== */

/* ========================================
   主布局结构
   ======================================== */

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ========================================
   头部导航
   ======================================== */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  height: 70px;
  flex-shrink: 0;
  z-index: var(--z-sticky);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  user-select: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-xl);
}

.header-search {
  flex: 1;
  max-width: 500px;
  margin: 0 var(--spacing-xl);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* 桌面端隐藏菜单按钮 */
#menuToggle {
  display: none;
}

@media (max-width: 767px) {
  #menuToggle {
    display: flex;
  }
}

/* ========================================
   主内容区
   ======================================== */

.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ========================================
   侧边栏
   ======================================== */

.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-section {
  padding: var(--spacing-lg) var(--spacing-md);
}

.sidebar-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  padding: 0 var(--spacing-md);
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--text-base);
}

.sidebar-item:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.sidebar-item.active {
  background: var(--bg-glass-hover);
  color: var(--color-primary);
  font-weight: var(--font-medium);
}

.sidebar-item .icon {
  color: currentColor;
}

/* 歌单列表 */
.playlist-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.playlist-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.playlist-item:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

.playlist-item.active {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
  font-weight: var(--font-medium);
}

.playlist-item-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.playlist-item-count {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ========================================
   内容区域
   ======================================== */

.content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
  background: var(--bg-primary);
}

.content-header {
  margin-bottom: var(--spacing-xl);
}

.content-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.content-subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
}

.content-body {
  /* 内容区域主体 */
}

/* ========================================
   歌曲列表
   ======================================== */

.song-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.song-list-header {
  display: grid;
  grid-template-columns: 48px 1fr 200px 80px;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-sm);
}

.song-list-item {
  display: grid;
  grid-template-columns: 48px 1fr 200px 80px;
  gap: var(--spacing-md);
  align-items: center;
}

/* ========================================
   网格布局
   ======================================== */

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-auto {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

/* ========================================
   播放器栏
   ======================================== */

.player-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 90px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-md) var(--spacing-xl);
  z-index: var(--z-player);
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  backdrop-filter: blur(20px);
}

/* 当前播放信息 */
.player-current {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 250px;
}

.player-cover {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: var(--bg-tertiary);
  box-shadow: var(--shadow-md);
}

.player-info {
  flex: 1;
  min-width: 0;
}

.player-title {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 2px;
}

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

/* 播放控制 */
.player-controls {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  max-width: 600px;
}

.player-buttons {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.player-progress {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.player-time {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 40px;
}

.player-time:first-child {
  text-align: right;
}

.player-time:last-child {
  text-align: left;
}

.player-progress-bar {
  flex: 1;
}

/* 右侧控制 */
.player-extras {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-width: 250px;
  justify-content: flex-end;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-width: 120px;
}

.volume-slider {
  flex: 1;
}

/* ========================================
   歌词面板
   ======================================== */

.lyrics-panel {
  position: fixed;
  right: 0;
  top: 70px;
  bottom: 90px;
  width: 350px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: var(--spacing-xl);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  z-index: var(--z-sticky);
}

.lyrics-panel.active {
  transform: translateX(0);
}

.lyrics-panel-header {
  margin-bottom: var(--spacing-xl);
}

.lyrics-panel-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.lyrics-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.lyric-line {
  font-size: var(--text-base);
  color: var(--text-tertiary);
  line-height: 1.8;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.lyric-line:hover {
  color: var(--text-secondary);
}

.lyric-line.active {
  color: var(--color-primary);
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  transform: translateX(var(--spacing-sm));
}

/* 播放列表面板 */
.playlist-panel {
  position: fixed;
  right: 0;
  top: 70px;
  bottom: 90px;
  width: 350px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: var(--spacing-xl);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  z-index: var(--z-sticky);
}

.playlist-panel.active {
  transform: translateX(0);
}

.playlist-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
}

.playlist-panel-title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.playlist-panel-count {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0;
}

.playlist-queue {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.queue-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.queue-item:hover {
  background: var(--bg-glass);
}

.queue-item.active {
  background: var(--bg-glass-hover);
  border-left: 3px solid var(--color-primary);
}

.queue-item-index {
  font-size: var(--text-sm);
  color: var(--text-muted);
  min-width: 24px;
  text-align: center;
}

.queue-item-info {
  flex: 1;
  min-width: 0;
}

.queue-item-title {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.queue-item-remove {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.queue-item:hover .queue-item-remove {
  opacity: 1;
}

/* ========================================
   响应式布局
   ======================================== */

/* 移动端 (< 768px) */
@media (max-width: 767px) {
  .header {
    padding: var(--spacing-md);
  }
  
  .header-search {
    display: none;
  }
  
  .sidebar {
    position: fixed;
    left: 0;
    top: 70px;
    bottom: 90px;
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
    z-index: var(--z-modal);
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
  
  .content {
    padding: var(--spacing-md);
  }
  
  .player-bar {
    padding: var(--spacing-md);
    flex-wrap: wrap;
    height: auto;
  }
  
  .player-current {
    width: 100%;
    order: -1;
  }
  
  .player-controls {
    width: 100%;
  }
  
  .player-extras {
    width: 100%;
    justify-content: space-between;
  }
  
  .lyrics-panel {
    width: 100%;
  }

  .playlist-panel {
    width: 100%;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* 平板 (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .sidebar {
    width: 200px;
  }
  
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .lyrics-panel {
    width: 300px;
  }

  .playlist-panel {
    width: 300px;
  }
}

/* 桌面 (>= 1024px) */
@media (min-width: 1024px) {
  /* 默认桌面样式 */
}

/* 大屏 (>= 1280px) */
@media (min-width: 1280px) {
  .content {
    max-width: 1280px;
    margin: 0 auto;
  }
}