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

.no-transition,
.no-transition *,
.no-transition *::before,
.no-transition *::after {
  transition: none !important;
}

:root {
  --bg: #f0f4f8;
  --card-bg: #ffffff;
  --text: #1a202c;
  --text-light: #718096;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99,102,241,0.08);
  --border: #e2e8f0;
  --chord-color: #6366f1;
  --chord-bg: rgba(99,102,241,0.12);
  --section-color: #6366f1;
  --sidebar-bg: #f8fafc;
  --hover-bg: #f1f5f9;
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --font-song: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --text: #e2e8f0;
  --text-light: #94a3b8;
  --accent: #818cf8;
  --accent-hover: #6366f1;
  --accent-light: rgba(129,140,248,0.12);
  --border: #334155;
  --chord-color: #fbbf24;
  --chord-bg: rgba(251,191,36,0.12);
  --section-color: #818cf8;
  --sidebar-bg: #1e293b;
  --hover-bg: #334155;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.4);
}

body {
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  scrollbar-width: thin;
  -ms-overflow-style: auto;
}

body::-webkit-scrollbar {
  width: 8px;
}

body::-webkit-scrollbar-track {
  background: var(--bg);
}

body::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

body::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}

.bg-deco {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 600px 400px at 15% 10%, rgba(99,102,241,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 500px 500px at 85% 80%, rgba(239,68,68,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 400px 300px at 50% 50%, rgba(99,102,241,0.03) 0%, transparent 70%);
}

.header {
  background: linear-gradient(135deg, rgba(255,255,255,0.92), rgba(248,250,252,0.92));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 20px rgba(0,0,0,0.04);
  transition: var(--transition);
}

[data-theme="dark"] .header {
  background: linear-gradient(135deg, rgba(30,41,59,0.95), rgba(15,23,42,0.95));
}

.header-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--chord-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition);
}

.logo:hover {
  opacity: 0.85;
}

/* Page Navigation - Outside Header */
.page-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--card-bg);
  border-radius: 24px;
  padding: 4px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.nav-tab {
  padding: 8px 24px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  background: none;
  color: var(--text-light);
  position: relative;
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--text);
  background: var(--hover-bg);
}

.nav-tab.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  box-shadow: 0 2px 10px rgba(99,102,241,0.3);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 24px;
  padding: 8px 16px;
  flex: 1;
  max-width: 360px;
  transition: var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 14px;
  color: var(--text);
  width: 100%;
}

.search-box input::placeholder { color: var(--text-light); }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle {
  position: relative;
  width: 56px;
  height: 28px;
  cursor: pointer;
}

.theme-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #60a5fa, #818cf8);
  border-radius: 28px;
  transition: var(--transition);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: var(--transition);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.theme-toggle input:checked + .toggle-slider {
  background: linear-gradient(135deg, #4c1d95, #6366f1);
}

.theme-toggle input:checked + .toggle-slider::before {
  transform: translateX(28px);
}

.toggle-icon {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  transition: var(--transition);
  pointer-events: none;
}

.toggle-icon.sun {
  left: 7px;
  color: #fbbf24;
  opacity: 1;
}

.toggle-icon.moon {
  right: 7px;
  color: #e2e8f0;
  opacity: 0.5;
}

.theme-toggle input:checked + .toggle-slider .sun { opacity: 0.5; }
.theme-toggle input:checked + .toggle-slider .moon { opacity: 1; }

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--chord-color));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

/* Main Content */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 28px;
  position: relative;
  z-index: 1;
  min-height: calc(100vh - 150px);
}

/* Page Top Section - Header Left, Nav Right */
.page-top-section {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}

.page-top-left {
  animation: fadeInDown 0.6s ease-out;
}

.page-top-left {
  flex: 0 1 auto;
}

.page-top-right {
  flex-shrink: 0;
  padding-top: 8px;
}

/* Page Header */
.page-header {
  margin-bottom: 0;
}

.page-title {
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.page-subtitle {
  font-size: 16px;
  color: var(--text-light);
}

.page-stats {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.stat-number {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  font-size: 13px;
  color: var(--text-light);
}

/* Song Cards List (vertical layout) */
.songs-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Song Card */
.song-card-home {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.song-card-home::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--chord-color));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.song-card-home:hover::before {
  transform: scaleX(1);
}

.song-card-home:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.song-card-body {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.song-card-header {
  width: 100%;
}

.song-card-title {
  font-family: var(--font-song);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  transition: var(--transition);
}

.song-card-home:hover .song-card-title {
  color: var(--accent);
}

.song-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 8px;
}

.song-card-artist {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: var(--accent-light);
  border-radius: 20px;
  font-weight: 600;
  font-size: 12px;
  color: var(--accent);
  transition: var(--transition);
}

.song-card-info {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.info-tag {
  padding: 2px 8px;
  background: var(--hover-bg);
  border-radius: 10px;
  font-size: 11px;
  color: var(--text-light);
  border: 1px solid var(--border);
}

.chords-preview {
  display: flex;
  gap: 0px;
  flex-wrap: nowrap;
  min-height: auto;
  align-items: center;
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

.chords-preview::-webkit-scrollbar {
  display: none;
}

.chord-mini-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 4px 6px;
  border-radius: 6px;
  transition: var(--transition);
  cursor: default;
  flex-shrink: 0;
}

.chord-mini-container:hover {
  background: var(--accent-light);
  transform: scale(1.05);
}

.chord-mini-name {
  font-size: 10px;
  font-weight: 700;
  color: var(--chord-color);
  text-align: center;
  font-family: var(--font-ui);
}

/* Artist Page Styles */
.artists-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: fadeInUp 0.6s ease-out;
}

.artist-letter-group {
  margin-bottom: 40px;
  animation: fadeInUp 0.5s ease-out backwards;
}

.letter-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
  position: relative;
}

.letter-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--chord-color));
  border-radius: 2px;
}

.letter-badge {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.letter-count {
  font-size: 14px;
  color: var(--text-light);
}

.artist-card {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  padding: 16px 20px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: fit-content;
  min-width: 140px;
}

.artist-card:hover {
  transform: translateX(4px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.artist-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.artist-count {
  font-size: 13px;
  color: var(--text-light);
  background: var(--hover-bg);
  padding: 4px 12px;
  border-radius: 20px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-light);
  animation: fadeInUp 0.4s ease-out;
}

.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

.breadcrumb a:hover {
  color: var(--accent-hover);
}

.breadcrumb-sep {
  color: var(--border);
}

.breadcrumb-current {
  color: var(--text);
  font-weight: 600;
}

/* Loading State */
.loading-skeleton {
  background: linear-gradient(90deg, var(--hover-bg) 25%, var(--border) 50%, var(--hover-bg) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius);
}

/* Skeleton card state */
.song-card-home.skeleton {
  background: var(--card-bg);
}

.song-card-home.skeleton::before {
  display: none;
}

.song-card-home.skeleton:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--border);
}

.song-card-home.skeleton .song-card-body {
  min-height: 100px;
  background: linear-gradient(90deg, var(--hover-bg) 25%, var(--border) 50%, var(--hover-bg) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
}

.stat-number:empty::before {
  content: '-';
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(20px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  animation: fadeInUp 0.6s ease-out;
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.empty-state-desc {
  font-size: 14px;
  color: var(--text-light);
}

/* Back Button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 20px;
}

.back-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateX(-2px);
}

/* Pagination */
.pagination-container {
  margin-top: 32px;
  padding-bottom: 32px;
  animation: fadeInUp 0.4s ease-out;
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.pagination-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
}

.pagination-btn:hover:not(:disabled) {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-numbers {
  display: flex;
  align-items: center;
  gap: 4px;
}

.pagination-number {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition);
}

.pagination-number:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.pagination-number.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

.pagination-info {
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
}

.pagination-info span {
  color: var(--text);
  font-weight: 600;
}

/* Footer */
.footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 24px 28px;
  margin-top: auto;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.copyright {
  font-size: 13px;
  color: var(--text-light);
}

.icp {
  font-size: 12px;
  color: var(--text-light);
  padding: 4px 12px;
  background: var(--hover-bg);
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* Responsive - Mobile only */
@media (max-width: 768px) {
  .header { padding: 10px 16px; }
  .main-container { padding: 20px 16px; min-height: calc(100vh - 120px); }
  .songs-grid { grid-template-columns: 1fr; gap: 16px; }
  .page-stats { flex-wrap: wrap; gap: 12px; }
  .stat-item { padding: 8px 14px; }
  .stat-number { font-size: 20px; }
  
  /* Hide page-header on mobile */
  .page-header {
    display: none;
  }
  
  /* Mobile page-nav styling */
  .page-top-section {
    margin-bottom: 16px;
    gap: 0;
  }

  .page-top-right {
    width: 100%;
    padding-top: 0;
  }

  .page-nav {
    width: 100%;
    justify-content: center;
    background: var(--bg);
    border-radius: 12px;
    padding: 3px;
    gap: 3px;
  }

  .nav-tab {
    flex: 1;
    padding: 10px 16px;
    font-size: 14px;
    border-radius: 10px;
    text-align: center;
  }

  .nav-tab.active {
    background: var(--accent);
    color: #fff;
  }

  /* Mobile artist cards - one per row */
  .artists-grid {
    flex-direction: column;
    gap: 10px;
  }

  .artist-card {
    width: 100%;
    min-width: auto;
  }

  /* Mobile pagination */
  .pagination-container {
    margin-top: 24px;
    padding-bottom: 24px;
  }

  .pagination {
    gap: 4px;
  }

  .pagination-btn {
    padding: 8px 12px;
    font-size: 12px;
  }

  .pagination-number {
    width: 32px;
    height: 32px;
    font-size: 12px;
  }

  .pagination-info {
    font-size: 12px;
  }

  /* Mobile footer */
  .footer {
    padding: 16px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .icp {
    font-size: 11px;
    padding: 3px 10px;
  }
}