: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;
  --code-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;
  --code-bg: #0f172a;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.4);
}
* { margin:0; padding:0; box-sizing:border-box; }
.no-transition,
.no-transition *,
.no-transition *::before,
.no-transition *::after {
  transition: none !important;
}
body {
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}
.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;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 20px rgba(0,0,0,0.04);
  transition: var(--transition);
}

.header-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
[data-theme="dark"] .header {
  background: linear-gradient(135deg, rgba(30,41,59,0.95), rgba(15,23,42,0.95));
}
.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.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;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 24px;
  padding: 8px 12px 8px 16px;
  flex: 1;
  max-width: 360px;
  transition: var(--transition);
  position: relative;
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* Search clear button */
.search-clear-btn {
  width: 20px;
  height: 20px;
  border: none;
  background: var(--hover-bg);
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-light);
  transition: opacity 0.2s, visibility 0.2s;
  flex-shrink: 0;
  padding: 0;
  opacity: 0;
  visibility: hidden;
}

.search-clear-btn:hover {
  background: var(--border);
  color: var(--text);
}

.search-clear-btn.visible {
  opacity: 1;
  visibility: visible;
}
.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;
  display: flex;
  align-items: center;
  justify-content: center;
}
.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);
}

/* Mobile Search Toggle */
.search-toggle-btn {
  display: none;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  transition: var(--transition);
}

.search-toggle-btn:hover {
  background: var(--hover-bg);
  border-color: var(--accent);
  color: var(--accent);
}

.search-box-mobile {
  position: fixed;
  top: 57px;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  z-index: 101;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out, visibility 0.2s ease-out;
  pointer-events: none;
}

.search-box-mobile.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.search-box-mobile .search-box {
  max-width: 100%;
  width: 100%;
}
.main-layout {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 20px 0;
  gap: 20px;
  min-height: calc(100vh - 80px);
  position: relative;
  z-index: 1;
}
.section-nav {
  width: 120px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-radius: var(--radius);
  padding: 12px 8px;
  border: 1px solid var(--border);
  position: sticky;
  top: 80px;
  align-self: flex-start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.section-nav .section-item {
  display: block;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.section-nav .section-item:hover { background: var(--hover-bg); color: var(--accent); transform: translateX(2px); }
.section-nav .section-item.active { background: var(--accent); color: #fff; font-weight: 600; box-shadow: 0 2px 8px rgba(99,102,241,0.3); }
.content-area {
  flex: 1;
  min-width: 0;
}
.song-card {
  background: var(--card-bg);
  border-radius: var(--radius) var(--radius) 0 0;
  border: 1px solid var(--border);
  border-bottom: none;
  padding: 36px 36px 0;
  box-shadow: var(--shadow);
  transition: var(--transition);
  max-width: 900px;
  margin: 0 auto;
}
.song-card.loaded {
  animation: fadeInUp 0.6s ease-out;
}
.song-header {
  text-align: center;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--border);
  position: relative;
}
.song-header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--chord-color));
  border-radius: 2px;
}
.song-title {
  font-family: var(--font-song);
  font-size: 32px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.song-meta {
  font-size: 14px;
  color: var(--text-light);
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.song-info {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--text-light);
  flex-wrap: wrap;
}
.song-info span {
  background: var(--hover-bg);
  padding: 3px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.song-info span:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.chord-content {
  font-family: var(--font-song);
  font-size: 18px;
  line-height: 1.6;
}
.section-title {
  color: var(--section-color);
  font-weight: 700;
  font-size: 15px;
  margin: 24px 0 10px;
  padding: 6px 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  border-radius: 20px;
  transition: var(--transition);
}

.section-content { 
  transition: opacity 0.3s ease; 
  padding-top: 30px;
}
.section-content:has(> :first-child:not(.chord-line)) {
  padding-top: 0;
}
.tab-block {
  margin-bottom: 16px;
  padding: 4px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tab-block .tab-svg {
  display: block;
  max-width: 100%;
  height: auto;
}
.tab-block.tab-fallback {
  font-family: 'Courier New', Consolas, monospace;
  font-size: 12px;
  line-height: 1.4;
  white-space: pre;
  color: var(--text-light);
  background: var(--code-bg);
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
}
.chord-line {
  font-family: var(--font-song);
  font-size: 18px;
  line-height: 3;
  margin-bottom: 4px;
  white-space: normal;
}
.chord-line:not(.pure-chord-line) {
  padding-left: 15px;
}
.chord-content.style-diagram .chord-line {
  padding-top: 0px;
  line-height: 5;
}
.chord-content.style-name .chord-line,
.chord-content.style-number .chord-line {
  padding-top: 0px;
  line-height: 3;
}
.chord-unit-inline {
  position: relative;
  display: inline;
  cursor: pointer;
}
.chord-unit-inline.no-lyric {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  width: 60px;
  vertical-align: top;
}
.chord-above {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: 2px;
  white-space: nowrap;
  transition: var(--transition);
  pointer-events: auto;
}
.chord-unit-inline:hover .chord-above {
  transform: translateX(-50%) scale(1.08);
}
.chord-svg {
  transition: transform 0.15s ease;
  display: block;
  width: 45px;
  height: 48px;
}
.chord-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--chord-color);
  font-family: var(--font-ui);
  text-align: center;
  line-height: 1;
  margin-top: 1px;
}
.chord-name-display {
  font-size: 12px;
  font-weight: 700;
  color: var(--chord-color);
  font-family: var(--font-ui);
  background: var(--chord-bg);
  padding: 2px 6px;
  border-radius: 5px;
  border: 1px solid rgba(239,68,68,0.12);
  line-height: 1.2;
}

/* 和弦图模式 - 调整 chord-above 位置 */
.chord-content.style-diagram .chord-above {
  padding-bottom: 4px;
}

/* 和弦名/级数模式 - 调整 chord-above 位置 */
.chord-content.style-name .chord-above,
.chord-content.style-number .chord-above {
  padding-bottom: 6px;
}
.lyric-char {
  height: 24px;
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--chord-color);
  text-underline-offset: 3px;
  text-decoration-thickness: 2px;
  transition: var(--transition);
}
.chord-unit-inline:hover .lyric-char {
  color: var(--chord-color);
  text-decoration-thickness: 3px;
}
.lyric-normal {
  color: var(--text);
}
.chord-popup {
  position: fixed;
  z-index: 200;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 12px 12px 16px 12px;
  display: block;
  pointer-events: auto;
  min-width: 140px;
  width: auto;
  max-width: 200px;
  height: auto;
  max-height: 240px;
  opacity: 0;
  transform: scale(0.9) translateY(-10px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
  visibility: hidden;
}

.chord-popup.show {
  opacity: 1;
  transform: scale(1) translateY(0);
  visibility: visible;
}

.chord-popup .variant-buttons {
  transition: opacity 0.2s ease-out;
}

.chord-popup:not(.show) .variant-buttons {
  opacity: 0;
}

.chord-popup .chord-name {
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  color: var(--chord-color);
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.3;
}
.chord-popup svg { display: block; margin: 0 auto; }
.sidebar {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: sticky;
  top: 80px;
  align-self: flex-start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}
.sidebar-card {
  background: var(--sidebar-bg);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.sidebar-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-1px);
}
.sidebar-card h4 {
  font-size: 12px;
  color: var(--text-light);
  margin-bottom: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.control-row:last-child { margin-bottom: 0; }
.control-label {
  font-size: 12px;
  color: var(--text-light);
}
.btn-group {
  display: flex;
  align-items: center;
  gap: 4px;
}
.btn {
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 12px;
  transition: var(--transition);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:hover { background: var(--hover-bg); border-color: var(--accent); color: var(--accent); transform: translateY(-1px); box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.btn:active { transform: translateY(0); }
.btn.active { background: var(--accent); color: #fff; border-color: var(--accent); box-shadow: 0 2px 8px rgba(99,102,241,0.3); }
.btn.active:hover { background: var(--accent-hover); color: #fff; border-color: var(--accent-hover); }
.btn-sm { padding: 4px 10px; font-size: 11px; }
.btn-icon {
  width: 30px; height: 30px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  border-radius: 8px;
}
select.btn {
  appearance: none;
  padding-right: 22px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%23718096' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
  cursor: pointer;
}
.toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.toolbar .btn {
  display: flex;
  align-items: center;
  gap: 4px;
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 13px;
}
.chord-name-only {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  color: var(--chord-color);
  margin-right: 2px;
  vertical-align: super;
  line-height: 1;
}

.player-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--card-bg);
  position: sticky;
  bottom: 0;
  z-index: 50;
  border-radius: 0 0 var(--radius) var(--radius);
  margin: 32px -36px -36px;
}
.player-left {
  display: flex;
  align-items: center;
  gap: 16px;
}
.speed-control {
  display: flex;
  align-items: center;
  gap: 10px;
}
.speed-label {
  font-size: 14px;
  color: var(--text-light);
  white-space: nowrap;
}
.speed-control input[type="range"] {
  width: 100px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}
.speed-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}
.speed-control input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}
.speed-value {
  font-size: 13px;
  color: var(--text);
  font-weight: 600;
  min-width: 20px;
}
.player-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  transition: var(--transition);
}
.player-btn:hover {
  background: var(--hover-bg);
  border-color: var(--accent);
  color: var(--accent);
}
.play-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #fff;
  box-shadow: 0 4px 16px rgba(99,102,241,0.4);
  transition: var(--transition);
}
.play-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(99,102,241,0.5);
}
.play-btn:active {
  transform: scale(0.95);
}
.player-right {
  display: flex;
  align-items: center;
}
/* Fullscreen mode - Hide UI elements */
.fullscreen-mode .header,
.fullscreen-mode .section-nav,
.fullscreen-mode .sidebar { display: none; }

/* Desktop: hide player panel in fullscreen */
@media (min-width: 769px) {
  .fullscreen-mode .player-panel { display: none; }
}

.fullscreen-mode .main-layout {
  padding: 0;
  max-width: 100%;
  min-height: 100vh;
}

.fullscreen-mode .content-area {
  width: 100%;
  max-width: 100%;
}

.fullscreen-mode .song-card {
  border-radius: 0;
  border: none;
  box-shadow: none;
  max-width: 100%;
  margin: 0;
  padding: 20px 40px;
}

.fullscreen-mode .song-header {
  margin-bottom: 16px;
  padding-bottom: 12px;
}

.fullscreen-mode .song-title {
  font-size: 24px;
}

.fullscreen-exit {
  display: none;
}

/* Desktop fullscreen - Multi-column layout */
@media (min-width: 769px) {
  .fullscreen-mode .song-card {
    height: 100vh;
    overflow: hidden;
  }

  .fullscreen-mode .chord-content {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    align-content: flex-start;
    gap: 0 var(--fs-col-gap, 48px);
    height: calc(100vh - 120px);
    overflow-x: auto;
    overflow-y: hidden;
    font-size: calc(16px * var(--fs-zoom, 1));
    line-height: 1.5;
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .fullscreen-mode .chord-content::-webkit-scrollbar {
    display: none;
  }

  .fullscreen-mode .section-content {
    display: contents;
  }

  .fullscreen-mode .section-content .chord-line:first-child,
  .fullscreen-mode .section-content .tab-block:first-child {
    margin-top: 8px;
  }

  .fullscreen-mode .chord-line {
    font-size: calc(16px * var(--fs-zoom, 1));
    line-height: 1.5;
    break-inside: avoid;
    width: var(--fs-col-width, 680px);
    flex-shrink: 0;
  }

  .fullscreen-mode .chord-content.style-diagram .chord-line {
    padding-top: calc(52px * var(--fs-zoom, 1));
  }

  .fullscreen-mode .chord-content.style-name .chord-line,
  .fullscreen-mode .chord-content.style-number .chord-line {
    padding-top: calc(18px * var(--fs-zoom, 1));
  }

  .fullscreen-mode .section-title {
    break-after: avoid;
    break-inside: avoid;
    margin-top: calc(16px * var(--fs-zoom, 1));
    margin-bottom: calc(4px * var(--fs-zoom, 1));
    font-size: calc(18px * var(--fs-zoom, 1));
    width: var(--fs-col-width, 680px);
    flex-shrink: 0;
  }

  .fullscreen-mode .tab-block {
    width: var(--fs-col-width, 680px);
    flex-shrink: 0;
    break-inside: avoid;
  }

  .fullscreen-mode .tab-block .tab-svg {
    break-inside: avoid;
    width: 100%;
    height: auto;
  }

  .fullscreen-mode .chord-svg {
    width: calc(45px * var(--fs-zoom, 1));
    height: calc(48px * var(--fs-zoom, 1));
  }

  .fullscreen-mode .chord-label {
    font-size: calc(11px * var(--fs-zoom, 1));
  }

  .fullscreen-mode .chord-name-display {
    font-size: calc(12px * var(--fs-zoom, 1));
  }
}

/* Mobile fullscreen - Keep vertical scroll */
@media (max-width: 768px) {
  .fullscreen-mode .song-card {
    height: auto;
    min-height: 100vh;
    overflow: visible;
    padding: 16px;
    padding-bottom: 76px;
  }

  .fullscreen-mode .chord-content {
    height: auto;
    overflow-y: visible;
    display: block;
  }

  /* Fix player-panel position in mobile fullscreen */
  .fullscreen-mode .player-panel {
    margin: 0;
    border-radius: 0;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transform: none;
    width: 100%;
    box-sizing: border-box;
  }
}

/* Fullscreen navigation arrows - Desktop only */
.fullscreen-nav {
  display: none;
}

@media (min-width: 769px) {
  .fullscreen-mode .fullscreen-nav {
    display: flex;
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 80px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    opacity: 0.3;
    transition: opacity 0.3s, background 0.3s;
    color: var(--text);
  }

  .fullscreen-mode .fullscreen-nav:hover {
    opacity: 0.9;
    background: var(--hover-bg);
  }

  .fullscreen-mode .fullscreen-nav.prev {
    left: 0;
    border-radius: 0 8px 8px 0;
    border-left: none;
  }

  .fullscreen-mode .fullscreen-nav.next {
    right: 0;
    border-radius: 8px 0 0 8px;
    border-right: none;
  }

  .fullscreen-mode .fullscreen-exit {
    display: flex;
    position: fixed;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    opacity: 0.5;
    transition: opacity 0.3s, background 0.3s;
    color: var(--text);
  }

  .fullscreen-mode .fullscreen-exit:hover {
    opacity: 1;
    background: var(--hover-bg);
  }
}

/* Page indicator in fullscreen - Desktop only */
.fullscreen-mode .page-indicator {
  display: none;
}

@media (min-width: 769px) {
  .fullscreen-mode .page-indicator {
    display: block;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-light);
    z-index: 1000;
    opacity: 0.7;
  }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-16px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0.2); }
  50% { box-shadow: 0 0 0 6px rgba(99,102,241,0); }
}
.chord-unit.pulse {
  animation: pulseGlow 0.6s ease-out;
}
.skeleton-title {
  width: 200px;
  height: 32px;
  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: 6px;
  margin: 0 auto 12px;
}
.skeleton-meta {
  width: 300px;
  height: 16px;
  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;
  margin: 0 auto;
}
.skeleton-info {
  width: 400px;
  height: 14px;
  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;
  margin: 8px auto 0;
}
.skeleton-section {
  width: 80px;
  height: 24px;
  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: 12px;
  margin: 24px 0 10px;
}
.skeleton-lines {
  width: 100%;
  height: 60px;
  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;
  margin-bottom: 8px;
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
@media print {
  .header, .section-nav, .sidebar, .toolbar, .scroll-indicator, .edit-overlay, .bg-deco { display: none !important; }
  .main-layout { display: block; padding: 0; }
  .content-area { width: 100%; }
  .song-card { box-shadow: none; border: none; break-inside: avoid; }
  body { background: #fff; }
}
@media (max-width: 768px) {
  .main-layout { flex-direction: column; }
  .section-nav {
    width: 100%;
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px;
    overflow-x: auto;
    max-height: none;
  }
  .section-nav .section-item { width: auto; }
  .sidebar { width: 100%; position: static; }
  .header .search-box {
    display: none;
  }
  .search-toggle-btn {
    display: flex;
  }
  .header {
    position: relative;
  }
}

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  z-index: 1;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 40px;
  width: 100%;
  max-width: 400px;
  animation: fadeInUp 0.5s ease-out;
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--chord-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  display: inline-block;
  margin-bottom: 16px;
}

.login-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

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

.login-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.login-field label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.login-field input {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  transition: var(--transition);
}

.login-field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.login-field input::placeholder {
  color: var(--text-light);
}

.login-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-align: center;
}

.login-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  border: none;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.login-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}

.login-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.login-btn-loading {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.login-btn-loading .spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.login-footer {
  margin-top: 24px;
  text-align: center;
}

.login-back-link {
  color: var(--text-light);
  font-size: 13px;
  text-decoration: none;
  transition: var(--transition);
}

.login-back-link:hover {
  color: var(--accent);
}

.user-menu {
  position: relative;
}

.user-avatar-btn {
  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);
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.user-avatar-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(99,102,241,0.4);
}

.user-avatar-btn.logged-out {
  background: var(--hover-bg);
  color: var(--text-light);
  box-shadow: none;
}

.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: var(--transition);
}

.user-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown-item {
  display: block;
  width: 100%;
  padding: 10px 16px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.user-dropdown-item:hover {
  background: var(--hover-bg);
  color: var(--accent);
}

.user-dropdown-item.danger {
  color: #ef4444;
}

.user-dropdown-item.danger:hover {
  background: rgba(239, 68, 68, 0.1);
}

.user-dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

@media (max-width: 600px) {
  .login-card {
    padding: 24px;
  }
  
  .login-title {
    font-size: 18px;
  }
}

@media (max-width: 600px) {
  .main-layout {
    padding: 0;
  }
  .section-nav {
    display: none;
  }
  .song-card {
    padding: 20px 16px 0;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  .sidebar-card {
    border-radius: 0;
  }
  .player-panel {
    gap: 8px;
    padding: 10px 12px;
    margin: 20px -16px 0;
    flex-wrap: nowrap;
  }
  .player-left {
    gap: 6px;
    flex: 1;
    min-width: 0;
  }
  .player-right {
    gap: 6px;
  }
  .speed-control {
    gap: 4px;
    flex: 1;
    min-width: 0;
  }
  .speed-control input[type="range"] {
    width: 100%;
    min-width: 80px;
  }
  .speed-label {
    font-size: 10px;
    white-space: nowrap;
  }
  .speed-value {
    font-size: 11px;
    min-width: 16px;
  }
  .player-btn, .play-btn {
    width: 28px;
    height: 28px;
    padding: 4px;
  }
  .player-btn svg, .play-btn svg {
    width: 16px;
    height: 16px;
  }
}