:root {
    --bg: #0f0f1a;
    --card: #1a1a2e;
    --card-hover: #252542;
    --text: #e8e8f0;
    --text-dim: #8888a0;
    --accent: #ff6b9d;
    --accent2: #c084fc;
    --border: #2a2a45;
    --tag-pop: #4ecdc4;
    --tag-gufeng: #f7b731;
    --tag-rap: #ff6b6b;
    --tag-zhenghuo: #a29bfe;
    --tag-minyao: #26de81;
    --tag-tianci: #fd79a8;
    --tag-minzu: #e17055;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding-bottom: 80px;
  }
  .header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15,15,26,0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px;
  }
  .header-top {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
  }
  .avatar {
    width: 48px; height: 48px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 2px solid rgba(255,107,157,0.3);
  }
  .title-block h1 {
    font-size: 20px; font-weight: 700;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  }
  .title-block p {
    font-size: 12px; color: var(--text-dim); margin-top: 2px;
  }
  .search-box {
    position: relative;
  }
  .search-box input {
    width: 100%;
    padding: 10px 14px 10px 38px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
  }
  .search-box input:focus { border-color: var(--accent); }
  .search-box::before {
    content: "🔍";
    position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
    font-size: 14px; opacity: 0.6;
  }
  .filter-bar {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
  }
  .filter-bar::-webkit-scrollbar { display: none; }
  .filter-btn {
    flex-shrink: 0;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text-dim);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
  }
  .filter-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    color: #fff;
    border-color: transparent;
    font-weight: 600;
  }
  .letter-nav {
    position: fixed;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 90;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    background: rgba(26,26,46,0.8);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 4px 2px;
    border: 1px solid var(--border);
  }
  .letter-nav span {
    font-size: 9px;
    color: var(--text-dim);
    padding: 1px 4px;
    cursor: pointer;
    border-radius: 3px;
    line-height: 1.3;
    transition: all 0.15s;
  }
  .letter-nav span:hover, .letter-nav span.active {
    color: var(--accent);
    background: rgba(255,107,157,0.15);
    font-weight: 700;
  }
  .content { padding: 0 16px 40px; }
  .letter-section { margin-top: 20px; }
  .letter-section:first-child { margin-top: 8px; }
  .letter-header {
    font-size: 22px; font-weight: 800;
    color: var(--accent);
    padding: 8px 0;
    border-bottom: 2px solid var(--accent);
    margin-bottom: 8px;
    display: flex; align-items: center; gap: 8px;
  }
  .letter-header .count {
    font-size: 12px; font-weight: 500;
    color: var(--text-dim);
    background: var(--card);
    padding: 2px 8px;
    border-radius: 10px;
  }
  .song-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--card);
    margin-bottom: 8px;
    border: 1px solid transparent;
    transition: all 0.2s;
    cursor: pointer;
  }
  .song-card:hover { background: var(--card-hover); border-color: var(--border); }
  .song-card:active { transform: scale(0.98); }
  .song-card.gift {
    background: linear-gradient(135deg, rgba(255,193,7,0.12), rgba(255,152,0,0.08));
    border: 1px solid rgba(255,87,34,0.4);
    box-shadow: 0 0 12px rgba(255,152,0,0.15);
  }
  .song-card.gift .song-name {
    color: #ff5722;
    font-weight: 700;
  }
  .song-card.gift .song-num {
    background: linear-gradient(135deg, #ffc107, #ff5722);
  }
  .tag-gift {
    background: rgba(255,193,7,0.2) !important;
    color: #ff5722 !important;
    border: 1px solid rgba(255,87,34,0.3);
  }

  .song-num {
    width: 28px; height: 28px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    display: flex; align-items: center; justify-content: center;
    font-size: 11px; font-weight: 700;
    color: #fff;
    flex-shrink: 0;
  }
  .song-info { flex: 1; min-width: 0; }
  .song-name {
    font-size: 15px; font-weight: 600;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .song-artist {
    font-size: 12px; color: var(--text-dim);
    margin-top: 2px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .song-tags {
    display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end;
    flex-shrink: 0; max-width: 120px;
  }
  .tag {
    font-size: 10px; font-weight: 600;
    padding: 2px 8px; border-radius: 10px;
    white-space: nowrap;
  }
  .tag-pop { background: rgba(78,205,196,0.15); color: var(--tag-pop); }
  .tag-gufeng { background: rgba(247,183,49,0.15); color: var(--tag-gufeng); }
  .tag-rap { background: rgba(255,107,107,0.15); color: var(--tag-rap); }
  .tag-zhenghuo { background: rgba(162,155,254,0.15); color: var(--tag-zhenghuo); }
  .tag-minyao { background: rgba(38,222,129,0.15); color: var(--tag-minyao); }
  .tag-tianci { background: rgba(253,121,168,0.15); color: var(--tag-tianci); }
  .tag-minzu { background: rgba(225,112,85,0.15); color: var(--tag-minzu); }
  .stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    padding: 0 16px 12px;
  }
  .stat-item {
    background: var(--card);
    border-radius: 12px;
    padding: 10px 6px;
    text-align: center;
    border: 1px solid var(--border);
  }
  .stat-num {
    font-size: 18px; font-weight: 800;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  }
  .stat-label { font-size: 10px; color: var(--text-dim); margin-top: 2px; }
  .empty-state {
    text-align: center; padding: 60px 20px; color: var(--text-dim);
  }
  .empty-state .emoji { font-size: 48px; margin-bottom: 12px; }
  .empty-state p { font-size: 14px; }
  .gift-banner {
    margin: 8px 16px 0;
    padding: 10px 14px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(255,107,157,0.15), rgba(192,132,252,0.15));
    border: 1px solid rgba(255,107,157,0.3);
    font-size: 13px;
    color: var(--accent);
    display: flex; align-items: center; gap: 8px;
  }
  .loading {
    text-align: center; padding: 80px 20px; color: var(--text-dim);
  }
  .loading .spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  @media (max-width: 380px) {
    .letter-nav { right: 2px; padding: 3px 1px; }
    .letter-nav span { font-size: 8px; padding: 0.5px 2px; }
    .song-tags { max-width: 90px; }
  }