:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f5;
  --text: #111111;
  --text-secondary: #555555;
  --border: #cccccc;
  --hover: #e8e8e8;
  --accent: #000000;
  --accent-text: #ffffff;
  --danger: #c0392b;
  --shadow: rgba(0,0,0,0.05);
  --navbar-height: 52px;
  --player-height: 70px;
}

[data-theme="dark"] {
  --bg: #1a1a1a;
  --bg-secondary: #242424;
  --text: #e0e0e0;
  --text-secondary: #a0a0a0;
  --border: #3a3a3a;
  --hover: #333333;
  --accent: #ffffff;
  --accent-text: #000000;
  --danger: #e74c3c;
  --shadow: rgba(255,255,255,0.05);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ===== 顶部导航 ===== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
  z-index: 30;
  transition: background 0.3s ease, border-color 0.3s ease;
  gap: 0.5rem;
}
.navbar .logo {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 3px;
  cursor: pointer;
  color: var(--text);
  white-space: nowrap;
}
.navbar .user-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  white-space: nowrap;
}
.navbar .user-area .avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.3s ease, color 0.3s ease;
}
.btn {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn:hover { background: var(--hover); }
.btn:active { background: var(--bg-secondary); }
.btn-dark {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}
.btn-dark:hover { background: var(--text-secondary); }
.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  font-size: 1.2rem;
  padding: 0.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, color 0.2s ease;
}
.icon-btn:hover { transform: scale(1.15); }
.icon-btn.small { font-size: 1rem; }
.icon-btn.play-main { font-size: 1.8rem; }
.icon-btn.active { color: var(--accent); }
#mobile-fav-btn { display: none; }

/* VIP 徽章 */
.vip-badge {
  display: inline-block;
  padding: 0.2em 0.6em;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  margin-left: 0.5rem;
  border: 1px solid transparent;
  vertical-align: middle;
  transition: all 0.3s ease;
}
.vip-0 { background: #d0ebff; color: #004085; border-color: #b8daff; }
.vip-1 { background: #ffeeba; color: #856404; border-color: #ffeeba; }
.vip-2 { background: #1a1a1a; color: #ffd700; border-color: #ffd700; }

/* ===== 主布局 ===== */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ===== 左侧 ===== */
.left-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-right: 1px solid var(--border);
  transition: border-color 0.3s ease;
  z-index: 1;
}
.search-area {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 0.75rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  transition: border-color 0.3s ease;
}
.search-area input {
  flex: 1;
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  background: var(--bg-secondary);
  color: var(--text);
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
  min-width: 0;
}
.search-area input:focus {
  background: var(--bg);
  border-color: var(--text-secondary);
}
.song-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.25rem 0;
}
.song-item {
  display: flex;
  align-items: center;
  padding: 0.55rem 0.75rem;
  cursor: pointer;
  transition: background 0.2s ease;
  gap: 0.75rem;
}
.song-item:hover { background: var(--hover); }
.song-item.playing { background: var(--bg-secondary); }
.song-item .index {
  width: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: color 0.3s ease;
}
.song-item.playing .index { color: var(--accent); font-weight: 700; }
.song-item .info { flex: 1; min-width: 0; }
.song-item .info .name {
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}
.song-item .info .meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.3s ease;
}
.song-item .fav-btn,
.song-item .dl-btn {
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.2s ease, transform 0.15s;
  padding: 0.25rem;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.song-item .fav-btn { font-size: 1.2rem; }
.song-item .fav-btn:hover { transform: scale(1.2); }
.song-item .dl-btn:hover { transform: scale(1.2); }
.song-item .fav-btn.active { color: var(--accent); }

/* ===== 右侧 ===== */
.right-panel {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  background: var(--bg);
  transition: transform 0.3s ease, border-color 0.3s ease;
  z-index: 20;
}
.right-panel .panel-title {
  padding: 0.75rem 0.75rem;
  font-weight: 600;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
  transition: border-color 0.3s ease, color 0.3s ease;
}
.right-panel .panel-title .count {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 400;
}
.right-panel .close-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
}
.favorites-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.25rem 0;
}
.favorites-list .fav-item {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  gap: 0.5rem;
  transition: background 0.2s ease;
}
.favorites-list .fav-item:hover { background: var(--hover); }
.favorites-list .fav-item .fav-name {
  flex: 1;
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}
.favorites-list .fav-item .fav-artist {
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.favorites-list .fav-item .remove-btn,
.favorites-list .fav-item .dl-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.25rem;
  transition: color 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.favorites-list .fav-item .remove-btn:hover { color: var(--danger); }
.favorites-list .fav-item .dl-btn:hover { color: var(--accent); }
.empty-hint {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-align: center;
  padding: 1.5rem 0;
}

/* ===== 播放器区域 ===== */
.player {
  border-top: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, border-color 0.3s ease;
  z-index: 40;
}

/* ===== 歌词面板 ===== */
.lyrics-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  border-bottom: none;
  background: var(--bg);
  position: relative;
}
.lyrics-panel.open {
  max-height: 260px;
  border-bottom: 1px solid var(--border);
}
.lyrics-content {
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  overflow-y: auto;
  max-height: 240px;
  scroll-behavior: smooth;
}
.lyrics-content .lyric-line {
  padding: 0.25rem 0;
  cursor: pointer;
  transition: color 0.2s ease, font-size 0.2s ease;
  line-height: 1.6;
}
.lyrics-content .lyric-line:hover { color: var(--text); }
.lyrics-content .lyric-line.current {
  color: var(--accent);
  font-weight: 700;
  font-size: 1rem;
}
.lyrics-content .no-lyrics {
  padding: 1.5rem 0;
  font-size: 0.85rem;
}

/* 全屏按钮 */
.lyrics-fullscreen-btn {
  position: absolute;
  top: 0.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-secondary);
  z-index: 10;
  display: none;
  transition: color 0.2s ease, transform 0.15s;
}
.lyrics-fullscreen-btn:hover { color: var(--accent); transform: scale(1.2); }
.lyrics-panel.open .lyrics-fullscreen-btn { display: inline-block; }

/* 歌词全屏模式 */
.lyrics-panel.fullscreen {
  position: fixed;
  top: var(--navbar-height, 52px);
  left: 0;
  right: 280px;
  bottom: var(--player-height, 70px);
  max-height: none !important;
  z-index: 200;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0;
}
@media (max-width: 768px) {
  .lyrics-panel.fullscreen { right: 0; }
}
.lyrics-panel.fullscreen .lyrics-content {
  height: 100%;
  max-height: none !important;
  padding: 2rem 1rem;
  overflow-y: auto;
}
.lyrics-panel.fullscreen .lyric-line {
  font-size: 1.2rem;
  line-height: 2;
}

/* ===== 播放器控制条 ===== */
.player-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  flex-wrap: wrap;
}
.player-controls .song-detail {
  width: 160px;
  min-width: 100px;
  flex: 1 0 auto;
}
.player-controls .song-detail .player-name {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}
.player-controls .song-detail .player-artist {
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.player-controls .ctrl-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}
.progress-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1 1 100%;
  order: 3;
  width: 100%;
  margin-top: 0.25rem;
}
.progress-area .time {
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-width: 35px;
  text-align: center;
}
.progress-slider {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.progress-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}
.volume-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  width: 100px;
  flex: 0 0 auto;
}
.volume-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 60px;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

/* ===== 下载模态框 ===== */
.download-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.download-overlay.show { opacity: 1; pointer-events: auto; }
.download-dialog {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px var(--shadow);
  width: 320px;
  max-width: 90vw;
  padding: 1.5rem;
  text-align: center;
}
.download-dialog .dialog-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text);
  word-break: break-all;
}
.download-dialog .dialog-btns {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.download-dialog .dialog-btn {
  padding: 0.65rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s ease;
}
.download-dialog .dialog-btn:hover { background: var(--hover); }
.download-dialog .dialog-cancel {
  margin-top: 0.75rem;
  padding: 0.5rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
}

/* ===== 登录/注册 ===== */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease;
  padding: 1rem;
}
.auth-overlay.hidden { display: none; }
.auth-card {
  width: 100%;
  max-width: 380px;
  padding: 2rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  text-align: center;
  box-shadow: 0 4px 12px var(--shadow);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.auth-card .auth-logo {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 6px;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.auth-card .auth-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}
.auth-card input {
  width: 100%;
  padding: 0.65rem 1rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  background: var(--bg-secondary);
  color: var(--text);
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}
.auth-card input:focus {
  background: var(--bg);
  border-color: var(--text-secondary);
}
.auth-card .btn {
  width: 100%;
  padding: 0.65rem;
  margin-top: 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 2px;
}
.auth-card .auth-toggle {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  text-decoration: underline;
}
.auth-card .auth-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

/* ===== Toast 提示 ===== */
.toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--accent);
  color: var(--accent-text);
  padding: 0.75rem 1.5rem;
  border-radius: 24px;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 300;
  max-width: 80vw;
  text-align: center;
  box-shadow: 0 4px 12px var(--shadow);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar { padding: 0.5rem 0.75rem; }
  .navbar .logo { font-size: 1rem; letter-spacing: 2px; }
  .navbar .user-area .avatar { width: 24px; height: 24px; font-size: 0.7rem; }
  .navbar .user-area span { display: none; }
  .btn { padding: 0.3rem 0.6rem; font-size: 0.75rem; }
  #mobile-fav-btn { display: inline-flex; }
  .right-panel {
    position: absolute; top: 0; right: -280px; height: 100%; width: 280px;
    box-shadow: -2px 0 8px var(--shadow);
  }
  .right-panel.open { right: 0; }
  .right-panel .close-btn { display: block; }
  .player-controls { gap: 0.5rem; padding: 0.5rem 0.75rem; }
  .player-controls .song-detail { width: 120px; }
  .player-controls .ctrl-group .icon-btn.small { font-size: 1rem; }
  .player-controls .play-main { font-size: 1.6rem; }
  .progress-area { order: 3; width: 100%; margin-top: 0.25rem; }
  .volume-group { display: none; }
  .lyrics-panel.open { max-height: 200px; }
  .lyrics-content { max-height: 180px; }
}

@media (max-width: 480px) {
  .song-item { padding: 0.45rem 0.5rem; gap: 0.5rem; }
  .song-item .index { width: 20px; font-size: 0.75rem; }
  .song-item .info .name { font-size: 0.9rem; }
  .song-item .info .meta { font-size: 0.75rem; }
  .search-area { padding: 0.5rem; }
  .search-area input { font-size: 0.9rem; padding: 0.5rem 0.75rem; }
}