/**
 * 音浪 (YinLang) 组件样式
 * 极致审美、极简而不简单
 * 与官网 (yinlan/index.html) 设计风格一致
 */

/* ========================================
 * 按钮系统 (Button System)
 * ======================================== */

/* 主按钮 - 白色填充 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--color-white);
  color: var(--color-black);
  border: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: 0 20px 60px rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
  transform: scale(0.98);
}

/* 次要按钮 - 边框样式 */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-secondary svg {
  transition: transform 0.3s ease;
}

.btn-secondary:hover svg {
  transform: translateX(4px);
}

/* 渐变按钮 */
.btn-gradient {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all 0.3s ease;
  animation: gradientShift 5s ease infinite;
}

.btn-gradient:hover {
  transform: scale(1.05);
  box-shadow: 0 20px 60px rgba(var(--color-accent-rgb), 0.4);
}

/* 幽灵按钮 */
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  color: var(--color-gray-400);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-ghost:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.05);
}

/* 图标按钮 */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  color: var(--color-white);
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.btn-icon svg {
  width: 24px;
  height: 24px;
}

.btn-icon--sm {
  width: 36px;
  height: 36px;
}

.btn-icon--sm svg {
  width: 18px;
  height: 18px;
}

.btn-icon--lg {
  width: 64px;
  height: 64px;
}

.btn-icon--lg svg {
  width: 32px;
  height: 32px;
}

/* ========================================
 * 卡片系统 (Card System)
 * ======================================== */

/* 基础卡片 */
.card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all 0.3s ease;
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
}

/* 交互卡片 */
.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* 玻璃卡片 */
.card--glass {
  background: rgba(20, 20, 20, 0.8);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 高亮卡片 */
.card--highlight {
  background: linear-gradient(135deg, rgba(var(--color-accent-rgb), 0.1) 0%, rgba(var(--color-accent-secondary-rgb), 0.05) 100%);
  border-color: rgba(var(--color-accent-rgb), 0.2);
}

.card--highlight:hover {
  border-color: rgba(var(--color-accent-rgb), 0.4);
  box-shadow: 0 0 40px rgba(var(--color-accent-rgb), 0.2);
}

/* 功能卡片 - 官网风格 */
.feature-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all 0.5s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-8px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.feature-card__icon svg {
  width: 28px;
  height: 28px;
  stroke: white;
}

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-sm);
}

.feature-card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: var(--line-height-relaxed);
}


/* ========================================
 * 音质选择器 (Audio Quality Selector)
 * ======================================== */

.quality-selector {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.quality-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s ease;
}

.quality-option:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

.quality-option--active {
  background: rgba(var(--color-accent-rgb), 0.1);
  border-color: rgba(var(--color-accent-rgb), 0.3);
}

.quality-option__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.quality-option__name {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.quality-option__badge {
  padding: 2px 8px;
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: white;
}

.quality-option__badge--hires {
  background: linear-gradient(135deg, #FFD700, #FFA500);
}

.quality-option__badge--lossless {
  background: linear-gradient(135deg, #00CED1, #20B2AA);
}

.quality-option__desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
}

.quality-option__bitrate {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  text-align: right;
}

.quality-option__check {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.quality-option--active .quality-option__check {
  background: var(--color-white);
  border-color: var(--color-white);
}

.quality-option--active .quality-option__check svg {
  stroke: var(--color-black);
}

/* 音质等级列表 */
.quality-levels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-sm);
}

.quality-level {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.quality-level:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.quality-level--active {
  background: rgba(var(--color-accent-rgb), 0.15);
  border-color: rgba(var(--color-accent-rgb), 0.4);
  box-shadow: 0 0 20px rgba(var(--color-accent-rgb), 0.2);
}

.quality-level__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: white;
}

.quality-level__name {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-xs);
}

.quality-level__bitrate {
  font-size: var(--font-size-xs);
  color: var(--color-gray-400);
}

/* 当前音质显示 */
.current-quality {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.current-quality--hires {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 165, 0, 0.2));
  color: #FFD700;
}

.current-quality--lossless {
  background: linear-gradient(135deg, rgba(0, 206, 209, 0.2), rgba(32, 178, 170, 0.2));
  color: #00CED1;
}

.current-quality--high {
  background: rgba(var(--color-accent-rgb), 0.2);
  color: var(--color-accent);
}

/* ========================================
 * 输入框系统 (Input System)
 * ======================================== */

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.input-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  font-weight: var(--font-weight-medium);
}

.input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-white);
  font-size: var(--font-size-md);
  transition: all 0.3s ease;
}

.input:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.input::placeholder {
  color: var(--color-gray-500);
}

.input--error {
  border-color: var(--color-error);
}

.input-error-text {
  font-size: var(--font-size-xs);
  color: var(--color-error);
}

/* 搜索输入框 */
.search-input {
  position: relative;
}

.search-input__icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-gray-500);
}

.search-input__icon svg {
  width: 20px;
  height: 20px;
}

.search-input .input {
  padding-left: calc(var(--space-md) + 28px);
}

/* ========================================
 * 音乐卡片 (Track Card)
 * ======================================== */

.track-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.track-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(var(--color-accent-rgb), 0.1), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.track-card:hover {
  background: rgba(255, 255, 255, 0.05);
}

.track-card:hover::before {
  opacity: 1;
}

.track-card--playing {
  background: rgba(var(--color-accent-rgb), 0.1);
}

.track-card__index {
  width: 32px;
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.track-card--playing .track-card__index {
  color: var(--color-accent);
}

.track-card__cover {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-gray-800);
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}

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

.track-card__cover-play {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.track-card:hover .track-card__cover-play {
  opacity: 1;
}

.track-card__info {
  flex: 1;
  min-width: 0;
}

.track-card__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.track-card__artist {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-card__quality {
  margin-left: var(--space-xs);
}

.track-card__duration {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.track-card__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.track-card:hover .track-card__actions {
  opacity: 1;
}

/* ========================================
 * 歌单卡片 (Playlist Card)
 * ======================================== */

.playlist-card {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.5s ease;
  cursor: pointer;
}

.playlist-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
  border-color: rgba(255, 255, 255, 0.1);
}

.playlist-card__cover {
  aspect-ratio: 1;
  background: var(--color-gray-800);
  position: relative;
  overflow: hidden;
}

.playlist-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.playlist-card:hover .playlist-card__cover img {
  transform: scale(1.1);
}

.playlist-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: var(--space-lg);
}

.playlist-card:hover .playlist-card__overlay {
  opacity: 1;
}

.playlist-card__play {
  width: 56px;
  height: 56px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.playlist-card:hover .playlist-card__play {
  transform: translateY(0);
}

.playlist-card__play svg {
  width: 24px;
  height: 24px;
  fill: var(--color-black);
  margin-left: 4px;
}

.playlist-card__info {
  padding: var(--space-md);
}

.playlist-card__name {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--space-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.playlist-card__meta {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
}

/* ========================================
 * 导航栏 (Navigation)
 * ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  backdrop-filter: blur(20px);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav__logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 5s ease infinite;
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.nav__link {
  color: var(--color-gray-400);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: color 0.3s ease;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-neon);
  transition: width 0.3s ease;
}

.nav__link:hover {
  color: var(--color-white);
}

.nav__link:hover::after {
  width: 100%;
}

.nav__link--active {
  color: var(--color-white);
}

.nav__link--active::after {
  width: 100%;
}


/* ========================================
 * 底部播放栏 (Mini Player)
 * ======================================== */

.mini-player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--floating-player-height);
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  z-index: var(--z-fixed);
}

.mini-player__track {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex: 1;
  min-width: 0;
}

.mini-player__cover {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}

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

.mini-player__info {
  min-width: 0;
}

.mini-player__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mini-player__artist {
  font-size: var(--font-size-xs);
  color: var(--color-gray-400);
}

.mini-player__controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.mini-player__progress {
  flex: 2;
  max-width: 600px;
  margin: 0 var(--space-xl);
}

.mini-player__extra {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ========================================
 * 进度条 (Progress Bar)
 * ======================================== */

.progress {
  position: relative;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  background: var(--color-white);
  border-radius: var(--radius-full);
  transition: width 0.1s linear;
  position: relative;
}

.progress__fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.progress:hover .progress__fill::after {
  opacity: 1;
}

.progress--gradient .progress__fill {
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
}

/* ========================================
 * 音量控制 (Volume Control)
 * ======================================== */

.volume-control {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.volume-control__slider {
  width: 80px;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
  position: relative;
}

.volume-control__fill {
  height: 100%;
  background: var(--color-white);
  border-radius: var(--radius-full);
}

/* ========================================
 * 标签页 (Tabs)
 * ======================================== */

.tabs {
  display: flex;
  gap: var(--space-xs);
  background: rgba(255, 255, 255, 0.05);
  padding: var(--space-xs);
  border-radius: var(--radius-full);
}

.tab {
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-400);
  cursor: pointer;
  transition: all 0.3s ease;
}

.tab:hover {
  color: var(--color-white);
}

.tab--active {
  background: var(--color-white);
  color: var(--color-black);
}

/* 下划线标签页 */
.tabs--underline {
  background: transparent;
  padding: 0;
  gap: var(--space-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tabs--underline .tab {
  padding: var(--space-md) 0;
  border-radius: 0;
  position: relative;
}

.tabs--underline .tab::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-white);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.tabs--underline .tab--active {
  background: transparent;
  color: var(--color-white);
}

.tabs--underline .tab--active::after {
  transform: scaleX(1);
}

/* ========================================
 * 开关 (Toggle Switch)
 * ======================================== */

.toggle {
  position: relative;
  width: 52px;
  height: 32px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.3s ease;
}

.toggle::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.toggle--active {
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
}

.toggle--active::after {
  transform: translateX(20px);
}

/* ========================================
 * 弹窗 (Modal)
 * ======================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay--active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: rgba(20, 20, 20, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay--active .modal {
  transform: scale(1) translateY(0);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

.modal__close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-gray-400);
  cursor: pointer;
  transition: all 0.3s ease;
}

.modal__close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

.modal__body {
  margin-bottom: var(--space-lg);
}

.modal__footer {
  display: flex;
  gap: var(--space-md);
  justify-content: flex-end;
}

/* ========================================
 * Toast 提示 (Toast)
 * ======================================== */

.toast {
  position: fixed;
  bottom: calc(var(--floating-player-height) + var(--space-lg));
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-black);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  z-index: var(--z-toast);
  opacity: 0;
  transition: all 0.3s ease;
}

.toast--show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast--error {
  background: var(--color-error);
  color: var(--color-white);
}

.toast--success {
  background: var(--color-success);
  color: var(--color-white);
}

/* ========================================
 * 头像 (Avatar)
 * ======================================== */

.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  color: white;
}

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

.avatar--sm { width: 32px; height: 32px; font-size: var(--font-size-sm); }
.avatar--lg { width: 64px; height: 64px; font-size: var(--font-size-lg); }
.avatar--xl { width: 96px; height: 96px; font-size: var(--font-size-xl); }
.avatar--xxl { width: 128px; height: 128px; font-size: var(--font-size-xxl); }

/* ========================================
 * 徽章 (Badge)
 * ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  background: var(--color-error);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  color: white;
}

.badge--dot {
  width: 8px;
  height: 8px;
  min-width: 8px;
  padding: 0;
}

.badge--accent {
  background: var(--gradient-aurora);
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
}

/* ========================================
 * 空状态 (Empty State)
 * ======================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xxxl);
  text-align: center;
}

.empty-state__icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.empty-state__icon svg {
  width: 40px;
  height: 40px;
  stroke: var(--color-gray-500);
}

.empty-state__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-sm);
}

.empty-state__desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  max-width: 300px;
  margin-bottom: var(--space-lg);
}

/* ========================================
 * 加载状态 (Loading)
 * ======================================== */

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--color-white);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

.loading-spinner--lg {
  width: 48px;
  height: 48px;
  border-width: 3px;
}

.loading-skeleton {
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.05) 25%, rgba(255, 255, 255, 0.1) 50%, rgba(255, 255, 255, 0.05) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

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

/* ========================================
 * 分割线 (Divider)
 * ======================================== */

.divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.05);
  margin: var(--space-lg) 0;
}

.divider--vertical {
  width: 1px;
  height: auto;
  margin: 0 var(--space-lg);
}