/* ============ CSS 变量 & 基础 ============ */
:root {
  --primary: #e74c3c;
  --primary-dark: #c0392b;
  --bg-dark: #1a1a2e;
  --bg-card: #16213e;
  --bg-surface: #0f3460;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #6c6c80;
  --border-color: #2a2a4a;
  --player-height: 80px;
  --header-height: 60px;
  --sidebar-width: 240px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ============ 滚动条 ============ */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}

/* ============ 头部导航 ============ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  padding: 0 20px;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

.header-logo {
  font-size: 22px;
  font-weight: bold;
  color: var(--primary);
  margin-right: 30px;
  cursor: pointer;
}

.header-logo span {
  color: var(--text-primary);
}

.header-nav {
  display: flex;
  gap: 20px;
}

.header-nav a {
  color: var(--text-secondary);
  font-size: 14px;
  padding: 8px 0;
  transition: color 0.2s;
}

.header-nav a:hover, .header-nav a.active {
  color: var(--text-primary);
}

.header-search {
  margin-left: auto;
  position: relative;
}

.header-search input {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 8px 16px 8px 36px;
  color: var(--text-primary);
  font-size: 14px;
  width: 200px;
  outline: none;
  transition: width 0.3s, border-color 0.3s;
}

.header-search input:focus {
  width: 280px;
  border-color: var(--primary);
}

.header-search .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

/* ============ 主内容区 ============ */
.main-content {
  margin-top: var(--header-height);
  margin-bottom: var(--player-height);
  padding: 20px;
  min-height: calc(100vh - var(--header-height) - var(--player-height));
}

/* ============ 轮播图 ============ */
.banner-section {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 30px;
  height: 280px;
}

.banner-slide {
  width: 100%;
  height: 100%;
  position: relative;
  display: none;
}

.banner-slide.active {
  display: block;
  animation: fadeIn 0.5s;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.banner-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 30px 20px 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
}

.banner-overlay h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.banner-dots {
  position: absolute;
  bottom: 15px;
  right: 20px;
  display: flex;
  gap: 8px;
}

.banner-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: background 0.3s;
}

.banner-dots span.active {
  background: var(--primary);
  width: 24px;
  border-radius: 4px;
}

/* ============ 区块标题 ============ */
.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title h3 {
  font-size: 20px;
  font-weight: 600;
}

.section-title .more-link {
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: color 0.2s;
}

.section-title .more-link:hover {
  color: var(--primary);
}

/* ============ 歌单卡片网格 ============ */
.playlist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.playlist-card {
  cursor: pointer;
  transition: transform 0.2s;
}

.playlist-card:hover {
  transform: translateY(-4px);
}

.playlist-card .cover {
  position: relative;
  width: 100%;
  padding-bottom: 100%;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-card);
}

.playlist-card .cover img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.playlist-card .cover .play-count {
  position: absolute;
  top: 6px;
  right: 8px;
  font-size: 11px;
  color: rgba(255,255,255,0.9);
  display: flex;
  align-items: center;
  gap: 3px;
}

.playlist-card .cover .play-btn {
  position: absolute;
  bottom: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.2s;
}

.playlist-card:hover .play-btn {
  opacity: 1;
  transform: translateY(0);
}

.playlist-card .title {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============ 歌曲列表 ============ */
.song-list {
  margin-bottom: 40px;
}

.song-item {
  display: flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.song-item:hover {
  background: var(--bg-card);
}

.song-item.playing {
  background: rgba(231, 76, 60, 0.1);
}

.song-item .index {
  width: 30px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

.song-item .cover {
  width: 46px;
  height: 46px;
  border-radius: 6px;
  overflow: hidden;
  margin: 0 12px;
  background: var(--bg-surface);
  flex-shrink: 0;
}

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

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

.song-item .info .name {
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-item .info .artist {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-item .duration {
  color: var(--text-muted);
  font-size: 12px;
  margin-left: 12px;
}

.song-item .actions {
  margin-left: 12px;
  opacity: 0;
  transition: opacity 0.2s;
}

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

/* ============ 歌手卡片 ============ */
.artist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.artist-card {
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s;
}

.artist-card:hover {
  transform: translateY(-4px);
}

.artist-card .avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto;
  background: var(--bg-card);
}

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

.artist-card .name {
  margin-top: 10px;
  font-size: 14px;
}

/* ============ 专辑卡片 ============ */
.album-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.album-card {
  cursor: pointer;
  transition: transform 0.2s;
}

.album-card:hover {
  transform: translateY(-4px);
}

.album-card .cover {
  width: 100%;
  padding-bottom: 100%;
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-card);
}

.album-card .cover img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.album-card .title {
  margin-top: 8px;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.album-card .artist {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ============ 底部播放器 ============ */
.player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--player-height);
  background: rgba(15, 15, 30, 0.98);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 16px;
  z-index: 1001;
}

.player-song {
  display: flex;
  align-items: center;
  width: 240px;
  min-width: 200px;
}

.player-song .cover {
  width: 56px;
  height: 56px;
  border-radius: 6px;
  overflow: hidden;
  margin-right: 12px;
  background: var(--bg-card);
  flex-shrink: 0;
}

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

.player-song .info {
  min-width: 0;
}

.player-song .info .name {
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
}

.player-song .info .artist {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.player-controls {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 20px;
}

.player-buttons {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 8px;
}

.player-buttons button {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 18px;
  transition: color 0.2s;
  padding: 4px;
}

.player-buttons button:hover {
  color: var(--text-primary);
}

.player-buttons .play-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.player-buttons .play-btn:hover {
  background: var(--primary-dark);
  color: white;
}

.player-progress {
  width: 100%;
  max-width: 600px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.player-progress .time {
  font-size: 11px;
  color: var(--text-muted);
  min-width: 40px;
}

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

.progress-bar {
  flex: 1;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  cursor: pointer;
  position: relative;
}

.progress-bar .progress {
  height: 100%;
  background: var(--primary);
  border-radius: 2px;
  position: relative;
  transition: width 0.1s linear;
}

.progress-bar .progress::after {
  content: '';
  position: absolute;
  right: -6px;
  top: -4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0;
  transition: opacity 0.2s;
}

.progress-bar:hover .progress::after {
  opacity: 1;
}

.player-extra {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 240px;
  justify-content: flex-end;
}

.player-extra button {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  transition: color 0.2s;
}

.player-extra button:hover {
  color: var(--text-primary);
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 6px;
}

.volume-bar {
  width: 80px;
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  cursor: pointer;
}

.volume-bar .volume {
  height: 100%;
  background: var(--text-secondary);
  border-radius: 2px;
  width: 70%;
}

/* ============ 歌词面板 ============ */
.lyrics-panel {
  position: fixed;
  top: var(--header-height);
  right: -400px;
  width: 380px;
  height: calc(100vh - var(--header-height) - var(--player-height));
  background: rgba(26, 26, 46, 0.98);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-color);
  transition: right 0.3s ease;
  z-index: 999;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.lyrics-panel.open {
  right: 0;
}

.lyrics-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lyrics-header h3 {
  font-size: 16px;
}

.lyrics-header .close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 20px;
}

.lyrics-content {
  flex: 1;
  overflow-y: auto;
  padding: 30px 20px;
  scroll-behavior: smooth;
}

.lyrics-line {
  padding: 8px 0;
  font-size: 15px;
  color: var(--text-muted);
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
}

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

.lyrics-line.active {
  color: var(--text-primary);
  font-size: 17px;
  font-weight: 600;
  transform: scale(1.05);
}

.lyrics-empty {
  text-align: center;
  color: var(--text-muted);
  margin-top: 40%;
}

/* ============ 详情页 ============ */
.detail-header {
  display: flex;
  padding: 30px 0;
  gap: 30px;
}

.detail-cover {
  width: 220px;
  height: 220px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-card);
  flex-shrink: 0;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

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

.detail-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.detail-info .type {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.detail-info h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
}

.detail-info .meta {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.detail-info .actions {
  display: flex;
  gap: 12px;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--text-secondary);
}

/* ============ 搜索结果页 ============ */
.search-results {
  padding: 20px 0;
}

.search-tabs {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.search-tabs .tab {
  padding: 6px 16px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.search-tabs .tab.active {
  background: var(--primary);
  color: white;
}

/* ============ 占位图 ============ */
.placeholder-cover {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-surface), var(--bg-card));
  color: var(--text-muted);
  font-size: 32px;
}

/* ============ 响应式 - 平板 ============ */
@media (max-width: 1024px) {
  .banner-section {
    height: 220px;
  }
  
  .playlist-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  
  .player-song {
    width: 180px;
    min-width: 160px;
  }
  
  .player-extra {
    width: 180px;
  }
  
  .lyrics-panel {
    width: 320px;
  }
}

/* ============ 响应式 - 手机 ============ */
@media (max-width: 768px) {
  :root {
    --header-height: 50px;
    --player-height: 64px;
  }
  
  .header {
    padding: 0 12px;
  }
  
  .header-logo {
    font-size: 18px;
    margin-right: 12px;
  }
  
  .header-nav {
    display: none;
  }
  
  .header-search input {
    width: 140px;
  }
  
  .header-search input:focus {
    width: 180px;
  }
  
  .main-content {
    padding: 12px;
  }
  
  .banner-section {
    height: 160px;
    border-radius: 8px;
  }
  
  .banner-overlay h2 {
    font-size: 16px;
  }
  
  .section-title h3 {
    font-size: 17px;
  }
  
  .playlist-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  
  .artist-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  
  .artist-card .avatar {
    width: 80px;
    height: 80px;
  }
  
  .album-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  
  .song-item {
    padding: 8px 10px;
  }
  
  .song-item .cover {
    width: 40px;
    height: 40px;
    margin: 0 8px;
  }
  
  .song-item .duration {
    display: none;
  }
  
  .song-item .actions {
    display: none;
  }
  
  /* 播放器 */
  .player {
    padding: 0 10px;
  }
  
  .player-song {
    width: auto;
    flex: 1;
    min-width: 0;
  }
  
  .player-song .cover {
    width: 44px;
    height: 44px;
    margin-right: 8px;
  }
  
  .player-song .info .name {
    max-width: 100px;
  }
  
  .player-controls {
    flex: 0;
    padding: 0;
  }
  
  .player-buttons {
    gap: 12px;
    margin-bottom: 0;
  }
  
  .player-buttons .prev-btn,
  .player-buttons .next-btn {
    display: none;
  }
  
  .player-progress {
    display: none;
  }
  
  .player-extra {
    display: none;
  }
  
  /* 歌词面板全屏 */
  .lyrics-panel {
    width: 100%;
    right: -100%;
    top: 0;
    height: 100vh;
    z-index: 1002;
  }
  
  /* 详情页 */
  .detail-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px 0;
  }
  
  .detail-cover {
    width: 180px;
    height: 180px;
  }
  
  .detail-info h1 {
    font-size: 22px;
  }
  
  .detail-info .actions {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .playlist-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  
  .artist-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .album-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============ 动画 ============ */
.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.slide-up {
  animation: slideUp 0.4s ease;
}

/* ============ 加载状态 ============ */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.loading::after {
  content: '';
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 8px;
  vertical-align: middle;
}

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