/* ============================================
   动态玻璃 UI 效果
   Glassmorphism Enhancement
   ============================================ */

/* --- 玻璃效果变量 --- */
:root {
  --glass-bg: rgba(255, 255, 255, 0.45);
  --glass-bg-strong: rgba(255, 255, 255, 0.65);
  --glass-bg-subtle: rgba(255, 255, 255, 0.28);
  --glass-bg-ultra: rgba(255, 255, 255, 0.78);
  --glass-border: rgba(255, 255, 255, 0.45);
  --glass-border-strong: rgba(255, 255, 255, 0.65);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), 0 0 0 0.5px rgba(255, 255, 255, 0.5) inset;
  --glass-shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.12), 0 0 0 0.5px rgba(255, 255, 255, 0.6) inset;
  --glass-blur: blur(24px);
  --glass-blur-strong: blur(40px);
  --glass-blur-subtle: blur(16px);
  --glass-saturate: saturate(200%);
  --glass-highlight: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.4) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  --glass-refraction: linear-gradient(
    120deg,
    rgba(255, 255, 255, 0.3) 0%,
    rgba(255, 255, 255, 0) 40%,
    rgba(255, 255, 255, 0.1) 60%,
    rgba(255, 255, 255, 0) 100%
  );
  --glass-shimmer: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.3) 50%,
    rgba(255, 255, 255, 0) 100%
  );
}

/* 暗色主题玻璃变量 */
[data-theme="dark"] {
  --glass-bg: rgba(30, 30, 32, 0.55);
  --glass-bg-strong: rgba(44, 44, 46, 0.7);
  --glass-bg-subtle: rgba(30, 30, 32, 0.35);
  --glass-bg-ultra: rgba(44, 44, 46, 0.82);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-border-strong: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.35), 0 0 0 0.5px rgba(255, 255, 255, 0.08) inset;
  --glass-shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.45), 0 0 0 0.5px rgba(255, 255, 255, 0.1) inset;
  --glass-highlight: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0.03) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  --glass-refraction: linear-gradient(
    120deg,
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0) 40%,
    rgba(255, 255, 255, 0.03) 60%,
    rgba(255, 255, 255, 0) 100%
  );
  --glass-shimmer: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0) 100%
  );
}

/* --- 全局玻璃背景增强 --- */
body {
  background: linear-gradient(135deg, 
    rgba(240, 242, 245, 0.65) 0%, 
    rgba(220, 225, 235, 0.45) 50%,
    rgba(240, 242, 245, 0.65) 100%
  ) !important;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(ellipse 600px 600px at 15% 15%, rgba(100, 149, 237, 0.25) 0%, transparent 50%),
    radial-gradient(ellipse 500px 500px at 85% 20%, rgba(175, 82, 222, 0.18) 0%, transparent 50%),
    radial-gradient(ellipse 700px 700px at 75% 80%, rgba(255, 149, 0, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 600px 600px at 20% 85%, rgba(52, 199, 89, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 400px 400px at 50% 50%, rgba(255, 55, 95, 0.1) 0%, transparent 50%);
  animation: glassBgFloat 25s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] body {
  background: linear-gradient(135deg, 
    rgba(0, 0, 0, 0.8) 0%, 
    rgba(28, 28, 30, 0.7) 50%,
    rgba(0, 0, 0, 0.8) 100%
  ) !important;
}

[data-theme="dark"] body::before {
  background: 
    radial-gradient(circle at 20% 20%, rgba(10, 132, 255, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(175, 82, 222, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 50% 50%, rgba(52, 199, 89, 0.05) 0%, transparent 50%);
}

@keyframes glassBgFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2%, 2%) rotate(1deg); }
  50% { transform: translate(-1%, 3%) rotate(-1deg); }
  75% { transform: translate(-2%, -1%) rotate(0.5deg); }
}

/* --- 导航栏增强玻璃效果 --- */
#top-nav {
  background: rgba(245, 245, 247, 0.6);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 
    0 1px 3px rgba(0, 0, 0, 0.05),
    inset 0 -1px 0 rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

#top-nav::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 300%;
  height: 100%;
  background: var(--glass-shimmer);
  animation: navShimmer 8s ease-in-out infinite;
  pointer-events: none;
}

#top-nav::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.5) 50%, 
    transparent 100%
  );
  pointer-events: none;
}

[data-theme="dark"] #top-nav {
  background: rgba(28, 28, 30, 0.6);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] #top-nav::after {
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.1) 50%, 
    transparent 100%
  );
}

@keyframes navShimmer {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(33%); }
}

/* --- 卡片玻璃效果增强 --- */
.subject-card,
.chapter-card,
.bk-card,
.module-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.subject-card::before,
.chapter-card::before,
.bk-card::before,
.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  z-index: 1;
  opacity: 0.6;
  transition: opacity 0.3s ease;
}

.subject-card::after,
.chapter-card::after,
.bk-card::after,
.module-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: var(--glass-refraction);
  transform: rotate(45deg);
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.subject-card:hover,
.chapter-card:hover,
.bk-card:hover,
.module-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--glass-shadow-lg);
  border-color: var(--glass-border-strong);
  background: var(--glass-bg-strong);
}

.subject-card:hover::before,
.chapter-card:hover::before,
.bk-card:hover::before,
.module-card:hover::before {
  opacity: 1;
}

.subject-card:hover::after,
.chapter-card:hover::after,
.bk-card:hover::after,
.module-card:hover::after {
  opacity: 0.4;
  animation: glassRefraction 1.5s ease-in-out;
}

@keyframes glassRefraction {
  0% { transform: rotate(45deg) translateX(-100%); }
  100% { transform: rotate(45deg) translateX(100%); }
}

.subject-card:active,
.chapter-card:active,
.bk-card:active,
.module-card:active {
  transform: translateY(-3px) scale(1.01);
  transition-duration: 0.1s;
}

/* --- 按钮玻璃效果 --- */
.btn,
.nav-btn,
.back-btn,
.btn-retro,
.shortcut-item {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
  transition: all 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.btn::before,
.nav-btn::before,
.back-btn::before,
.btn-retro::before,
.shortcut-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--glass-shimmer);
  transition: left 0.5s ease;
  pointer-events: none;
}

.btn:hover,
.nav-btn:hover,
.back-btn:hover,
.btn-retro:hover,
.shortcut-item:hover {
  background: var(--glass-bg);
  border-color: var(--glass-border-strong);
  box-shadow: 
    0 4px 16px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn:hover::before,
.nav-btn:hover::before,
.back-btn:hover::before,
.btn-retro:hover::before,
.shortcut-item:hover::before {
  left: 100%;
}

.btn:active,
.nav-btn:active,
.back-btn:active,
.btn-retro:active,
.shortcut-item:active {
  transform: translateY(0);
  box-shadow: 
    0 1px 4px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* 主要按钮增强 */
.btn-primary,
.btn-retro.primary {
  background: linear-gradient(135deg, 
    rgba(0, 122, 255, 0.9) 0%, 
    rgba(88, 86, 214, 0.9) 100%
  );
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 
    0 4px 16px rgba(0, 122, 255, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  color: white;
}

.btn-primary:hover,
.btn-retro.primary:hover {
  background: linear-gradient(135deg, 
    rgba(0, 106, 230, 0.95) 0%, 
    rgba(74, 72, 200, 0.95) 100%
  );
  box-shadow: 
    0 6px 24px rgba(0, 122, 255, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* 成功按钮增强 */
.btn-success,
.btn-retro.success {
  background: linear-gradient(135deg, 
    rgba(52, 199, 89, 0.9) 0%, 
    rgba(48, 209, 88, 0.9) 100%
  );
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 
    0 4px 16px rgba(52, 199, 89, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  color: white;
}

/* 危险按钮增强 */
.btn-danger,
.btn-retro.danger {
  background: linear-gradient(135deg, 
    rgba(255, 59, 48, 0.9) 0%, 
    rgba(255, 69, 58, 0.9) 100%
  );
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 
    0 4px 16px rgba(255, 59, 48, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  color: white;
}

/* --- 弹窗玻璃效果增强 --- */
.overlay {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
}

.search-dialog,
.modal-dialog,
.settings-dialog {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  border: 1px solid var(--glass-border);
  box-shadow: 
    var(--glass-shadow-lg),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.search-dialog::before,
.modal-dialog::before,
.settings-dialog::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.5) 50%, 
    transparent 100%
  );
  pointer-events: none;
  z-index: 10;
}

[data-theme="dark"] .search-dialog::before,
[data-theme="dark"] .modal-dialog::before,
[data-theme="dark"] .settings-dialog::before {
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.15) 50%, 
    transparent 100%
  );
}

/* --- Toast 玻璃效果 --- */
.toast {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow-lg);
  position: relative;
  overflow: hidden;
}

.toast::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.5;
}

/* --- 输入框玻璃效果 --- */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
textarea,
select {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: 
    inset 0 2px 4px rgba(0, 0, 0, 0.05),
    0 1px 2px rgba(0, 0, 0, 0.02);
  transition: all 0.2s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus,
select:focus {
  background: var(--glass-bg);
  border-color: var(--glass-border-strong);
  box-shadow: 
    inset 0 2px 4px rgba(0, 0, 0, 0.05),
    0 0 0 3px rgba(0, 122, 255, 0.15),
    0 2px 8px rgba(0, 122, 255, 0.1);
}

[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="number"]:focus,
[data-theme="dark"] input[type="email"]:focus,
[data-theme="dark"] input[type="password"]:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus {
  box-shadow: 
    inset 0 2px 4px rgba(0, 0, 0, 0.2),
    0 0 0 3px rgba(10, 132, 255, 0.2),
    0 2px 8px rgba(10, 132, 255, 0.15);
}

/* --- 首页统计栏玻璃效果 --- */
.hero-stats {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.hero-stats::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: var(--glass-refraction);
  transform: rotate(45deg);
  animation: statsGlassFloat 10s ease-in-out infinite;
  pointer-events: none;
}

@keyframes statsGlassFloat {
  0%, 100% { transform: rotate(45deg) translate(0, 0); }
  50% { transform: rotate(45deg) translate(5%, 5%); }
}

/* --- 快捷入口栏玻璃效果 --- */
.home-shortcuts {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.home-shortcuts::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.4;
}

/* --- 复习卡片玻璃效果 --- */
.review-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.review-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.5;
}

/* --- 搜索结果项玻璃效果 --- */
.search-result-item {
  background: transparent;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.search-result-item:hover {
  background: var(--glass-bg-subtle);
  border-color: var(--glass-border);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
}

/* --- 标签/徽章玻璃效果 --- */
.hero-badge,
.filter-chip,
.badge {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  position: relative;
  overflow: hidden;
}

.hero-badge::before,
.filter-chip::before,
.badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.4;
}

.filter-chip.active {
  background: linear-gradient(135deg, 
    rgba(0, 122, 255, 0.9) 0%, 
    rgba(88, 86, 214, 0.9) 100%
  );
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 2px 12px rgba(0, 122, 255, 0.3);
}

[data-theme="dark"] .filter-chip.active {
  background: linear-gradient(135deg, 
    rgba(10, 132, 255, 0.9) 0%, 
    rgba(88, 86, 214, 0.9) 100%
  );
}

/* --- 侧边栏玻璃效果 --- */
.sidebar,
.retro-sidebar {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
}

.sidebar::before,
.retro-sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.3;
}

/* --- 工具栏玻璃效果 --- */
.toolbar,
.retro-toolbar {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* --- 编辑器/预览区域玻璃效果 --- */
.editor-wrapper,
.retro-editor-wrapper,
.preview-area,
.retro-preview-area {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* --- 刷题模式玻璃效果 --- */
.quiz-container {
  position: relative;
}

.quiz-progress-text {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.quiz-scope-panel {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: none;
  box-shadow: var(--glass-shadow-lg);
}

.quiz-scope-title {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-bottom: 1px solid var(--border-light);
}

.quiz-scope-book,
.quiz-scope-group {
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.quiz-scope-book:hover,
.quiz-scope-group:hover {
  background: var(--glass-bg-subtle);
  border-color: var(--glass-border);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
}

.quiz-scope-tag {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
}

/* --- 错题本玻璃效果 --- */
.wrong-tabs {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.wrong-tab {
  transition: all 0.2s ease;
}

.wrong-tab.active {
  background: linear-gradient(135deg, 
    rgba(0, 122, 255, 0.9) 0%, 
    rgba(88, 86, 214, 0.9) 100%
  );
  box-shadow: 0 2px 12px rgba(0, 122, 255, 0.3);
  color: white;
}

.wrong-item {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.wrong-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.3;
}

.wrong-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--glass-shadow-lg);
  border-color: var(--glass-border-strong);
}

/* --- 回顾笔记玻璃效果 --- */
.retro-sidebar {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.retro-sidebar-header {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-bottom: 1px solid var(--glass-border);
}

.retro-toolbar {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.retro-editor-wrapper {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.retro-preview-area {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.retro-preview-area blockquote {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-left: 3px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* --- 树形结构玻璃效果 --- */
.retree-subject {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.2s ease;
}

.retree-subject:hover {
  box-shadow: var(--glass-shadow-lg);
  border-color: var(--glass-border-strong);
}

.retree-subject-header {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-bottom: 1px solid var(--glass-border);
  transition: background 0.2s ease;
}

.retree-subject-header:hover {
  background: var(--glass-bg);
}

.retree-doc {
  transition: all 0.2s ease;
}

.retree-doc:hover {
  background: var(--glass-bg-subtle);
}

.retree-doc.active {
  background: rgba(0, 122, 255, 0.1);
  border-left: 3px solid var(--accent);
}

[data-theme="dark"] .retree-doc.active {
  background: rgba(10, 132, 255, 0.15);
}

/* --- 已掌握玻璃效果 --- */
.mastered-item {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.mastered-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.3;
}

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

/* --- 模块统计玻璃效果 --- */
.mod-stat {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.mod-stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.4;
  transition: opacity 0.2s ease;
}

.mod-stat:hover {
  transform: translateY(-3px);
  box-shadow: var(--glass-shadow-lg);
  border-color: var(--glass-border-strong);
}

.mod-stat:hover::before {
  opacity: 0.6;
}

/* --- 卡片网格玻璃效果 --- */
.card-grid .card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.card-grid .card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.4;
  transition: opacity 0.2s ease;
}

.card-grid .card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glass-shadow-lg);
  border-color: var(--glass-border-strong);
}

.card-grid .card:hover::before {
  opacity: 0.6;
}

/* --- 全屏预览玻璃效果 --- */
.fullscreen-preview-overlay {
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
}

.fullscreen-preview-header {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-strong);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.fullscreen-preview-content {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
}

/* --- 复习卡片答案区域玻璃效果 --- */
.review-card-answer {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
}

.review-card-answer .review-card-label {
  background: rgba(52, 199, 89, 0.1);
  border-color: rgba(52, 199, 89, 0.2);
}

.review-card-answer .review-card-label::before {
  background: #34c759;
  box-shadow: 0 0 8px rgba(52, 199, 89, 0.4);
}

/* --- 复习卡片解析区域玻璃效果 --- */
.review-card-explanation {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
}

/* --- 复习操作按钮玻璃效果 --- */
.review-actions {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
}

/* --- 刷题答案区域玻璃效果 --- */
.quiz-answer {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

.quiz-answer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.3;
}

/* --- 刷题选项玻璃效果 --- */
.quiz-option {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.03);
  transition: all 0.2s ease;
}

.quiz-option:hover {
  background: var(--glass-bg);
  border-color: var(--glass-border-strong);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

.quiz-option.selected {
  background: rgba(0, 122, 255, 0.1);
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.2);
}

.quiz-option.correct {
  background: rgba(52, 199, 89, 0.1);
  border-color: var(--success);
  box-shadow: 0 0 0 2px rgba(52, 199, 89, 0.2);
}

.quiz-option.wrong {
  background: rgba(255, 59, 48, 0.1);
  border-color: var(--danger);
  box-shadow: 0 0 0 2px rgba(255, 59, 48, 0.2);
}

/* --- 卡片内部组件半透明 --- */
.mod-card-inner {
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
}

[data-theme="dark"] .mod-card-inner {
  background: rgba(255, 255, 255, 0.04);
}

.bk-card-inner {
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
}

[data-theme="dark"] .bk-card-inner {
  background: rgba(255, 255, 255, 0.04);
}

/* --- 章节卡片玻璃效果 --- */
.ch-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.ch-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.35;
}

.ch-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--glass-shadow-lg);
  border-color: var(--glass-border-strong);
  background: var(--glass-bg-strong);
}

.ch-card-inner {
  background: rgba(255, 255, 255, 0.3);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
}

[data-theme="dark"] .ch-card-inner {
  background: rgba(255, 255, 255, 0.04);
}

/* --- 复习展开按钮玻璃效果 --- */
.review-card-toggle {
  background: rgba(245, 245, 247, 0.5);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  transition: all 0.2s ease;
}

.review-card-toggle:hover {
  background: rgba(245, 245, 247, 0.7);
}

[data-theme="dark"] .review-card-toggle {
  background: rgba(44, 44, 46, 0.4);
}

[data-theme="dark"] .review-card-toggle:hover {
  background: rgba(44, 44, 46, 0.6);
}

/* --- 复习答案展开区域 --- */
.review-card-answer.expanded .review-card-answer-body {
  background: rgba(245, 245, 247, 0.4);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
}

[data-theme="dark"] .review-card-answer.expanded .review-card-answer-body {
  background: rgba(44, 44, 46, 0.3);
}

/* --- 复习项列表玻璃效果 --- */
.rv-item {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}

.rv-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-highlight);
  pointer-events: none;
  opacity: 0.3;
}

.rv-item:hover {
  transform: translateY(-1px);
  box-shadow: var(--glass-shadow-lg);
}

/* --- 复习解析区域玻璃效果 --- */
.rv-exp {
  background: rgba(245, 245, 247, 0.45);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-left: 3px solid var(--accent);
}

[data-theme="dark"] .rv-exp {
  background: rgba(44, 44, 46, 0.35);
}

/* --- 刷题操作区玻璃效果 --- */
.quiz-actions {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.04);
}

/* --- 快速选择栏玻璃效果 --- */
.quiz-scope-quick {
  background: rgba(245, 245, 247, 0.4);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-bottom: 1px solid var(--glass-border);
}

[data-theme="dark"] .quiz-scope-quick {
  background: rgba(44, 44, 46, 0.3);
}

/* --- 刷题范围列表 --- */
.quiz-scope-list {
  background: rgba(255, 255, 255, 0.15);
}

/* --- 搜索筛选栏玻璃效果 --- */
.search-filters {
  background: rgba(245, 245, 247, 0.4);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
}

[data-theme="dark"] .search-filters {
  background: rgba(44, 44, 46, 0.3);
}

/* --- 搜索键盘快捷键提示 --- */
.search-header kbd {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
}

/* --- 表单玻璃效果 --- */
.form-group input,
.form-group textarea,
.form-group select {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  background: var(--glass-bg);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12);
}

.form-actions {
  background: rgba(245, 245, 247, 0.4);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-top: 1px solid var(--glass-border);
}

[data-theme="dark"] .form-actions {
  background: rgba(44, 44, 46, 0.3);
}

/* --- 设置弹窗内部 --- */
.settings-body {
  background: transparent;
}

.settings-actions {
  background: rgba(245, 245, 247, 0.35);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-top: 1px solid var(--glass-border);
}

[data-theme="dark"] .settings-actions {
  background: rgba(44, 44, 46, 0.25);
}

/* --- Ghost 按钮玻璃效果 --- */
.btn-ghost {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
}

.btn-ghost:hover {
  background: var(--glass-bg);
  border-color: var(--glass-border-strong);
}

/* --- 模块徽章玻璃效果 --- */
.mod-subject-badge {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
}

/* --- Flashcard 进度条玻璃底板 --- */
.flashcard-progress-bar {
  background: rgba(0, 0, 0, 0.06);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .flashcard-progress-bar {
  background: rgba(255, 255, 255, 0.06);
}

/* --- 代码块玻璃效果 --- */
pre {
  background: rgba(29, 29, 31, 0.85);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 
    0 4px 16px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  position: relative;
  overflow: hidden;
}

pre::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.1) 50%, 
    transparent 100%
  );
  pointer-events: none;
}

[data-theme="dark"] pre {
  background: rgba(28, 28, 30, 0.9);
  border-color: rgba(255, 255, 255, 0.08);
}

code {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
}

/* --- 表格玻璃效果 --- */
table {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-saturate) var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
}

th {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border-bottom: 1px solid var(--glass-border);
}

td {
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] td {
  border-bottom-color: rgba(255, 255, 255, 0.04);
}

/* --- 滚动条玻璃效果 --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--glass-bg-subtle);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  -webkit-backdrop-filter: var(--glass-saturate) var(--glass-blur-subtle);
  border: 1px solid var(--glass-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--glass-bg);
}

/* --- 选区高亮玻璃效果 --- */
::selection {
  background: rgba(0, 122, 255, 0.3);
  color: var(--text-primary);
  backdrop-filter: blur(4px);
}

[data-theme="dark"] ::selection {
  background: rgba(10, 132, 255, 0.3);
}

/* --- 动态光晕效果 --- */
.glass-glow {
  position: relative;
  overflow: hidden;
}

.glass-glow::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    circle at var(--glow-x, 50%) var(--glow-y, 50%),
    rgba(0, 122, 255, 0.15) 0%,
    transparent 50%
  );
  pointer-events: none;
  transition: opacity 0.3s ease;
  opacity: 0;
}

.glass-glow:hover::before {
  opacity: 1;
}

/* --- 边框光效动画 --- */
@keyframes borderGlow {
  0%, 100% {
    border-color: rgba(0, 122, 255, 0.2);
    box-shadow: 0 0 20px rgba(0, 122, 255, 0.1);
  }
  50% {
    border-color: rgba(88, 86, 214, 0.3);
    box-shadow: 0 0 30px rgba(88, 86, 214, 0.15);
  }
}

.glass-glow-active {
  animation: borderGlow 3s ease-in-out infinite;
}

/* --- 毛玻璃模糊动画 --- */
@keyframes glassBlurPulse {
  0%, 100% {
    backdrop-filter: var(--glass-saturate) blur(20px);
    -webkit-backdrop-filter: var(--glass-saturate) blur(20px);
  }
  50% {
    backdrop-filter: var(--glass-saturate) blur(25px);
    -webkit-backdrop-filter: var(--glass-saturate) blur(25px);
  }
}

.glass-pulse {
  animation: glassBlurPulse 4s ease-in-out infinite;
}

/* --- 响应式玻璃效果调整 --- */
@media (max-width: 768px) {
  :root {
    --glass-blur: blur(16px);
    --glass-blur-strong: blur(24px);
    --glass-blur-subtle: blur(10px);
  }
  
  .subject-card,
  .chapter-card,
  .bk-card,
  .module-card {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  }
  
  .search-dialog,
  .modal-dialog,
  .settings-dialog {
    box-shadow: 
      0 8px 32px rgba(0, 0, 0, 0.15),
      inset 0 1px 0 rgba(255, 255, 255, 0.2);
  }
}

/* --- 波纹效果 --- */
.glass-ripple {
  position: absolute;
  width: 10px;
  height: 10px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  transform: scale(0);
  animation: glassRippleExpand 0.6s ease-out;
  pointer-events: none;
  z-index: 10;
}

[data-theme="dark"] .glass-ripple {
  background: rgba(255, 255, 255, 0.15);
}

@keyframes glassRippleExpand {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(40);
    opacity: 0;
  }
}

/* --- 导航栏动态光晕 --- */
#top-nav::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.3) var(--nav-glow-position, 50%),
    transparent 100%
  );
}

/* --- 元素可见性动画 --- */
.glass-visible {
  animation-play-state: running !important;
}

/* --- 3D 透视效果容器 --- */
.glass-3d {
  transform-style: preserve-3d;
  perspective: 1000px;
}

/* --- 光晕跟随效果 --- */
.glass-glow-follow {
  position: relative;
  overflow: hidden;
}

.glass-glow-follow::after {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: radial-gradient(
    circle,
    rgba(0, 122, 255, 0.2) 0%,
    transparent 70%
  );
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  left: var(--glow-x, 50%);
  top: var(--glow-y, 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 5;
}

.glass-glow-follow:hover::after {
  opacity: 1;
}

[data-theme="dark"] .glass-glow-follow::after {
  background: radial-gradient(
    circle,
    rgba(10, 132, 255, 0.15) 0%,
    transparent 70%
  );
}

/* --- 玻璃折射动画 --- */
@keyframes glassRefractionMove {
  0% {
    transform: rotate(45deg) translateX(-100%);
  }
  50% {
    transform: rotate(45deg) translateX(100%);
  }
  100% {
    transform: rotate(45deg) translateX(-100%);
  }
}

.glass-refraction-animated::after {
  animation: glassRefractionMove 3s ease-in-out infinite;
  opacity: 0.3;
}

/* --- 玻璃高光脉冲 --- */
@keyframes glassHighlightPulse {
  0%, 100% {
    opacity: 0.3;
  }
  50% {
    opacity: 0.6;
  }
}

.glass-highlight-pulse::before {
  animation: glassHighlightPulse 2s ease-in-out infinite;
}

/* --- 性能优化 --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .glass-glow-follow::after,
  .glass-refraction-animated::after,
  .glass-highlight-pulse::before {
    animation: none !important;
    opacity: 0 !important;
  }
}

/* --- 打印模式禁用玻璃效果 --- */
@media print {
  .subject-card,
  .chapter-card,
  .bk-card,
  .module-card,
  .review-card,
  .search-dialog,
  .modal-dialog,
  .settings-dialog,
  .toast,
  .sidebar,
  .retro-sidebar,
  .toolbar,
  .retro-toolbar,
  .editor-wrapper,
  .retro-editor-wrapper,
  .preview-area,
  .retro-preview-area,
  pre,
  table,
  .hero-stats,
  .home-shortcuts,
  .btn,
  .nav-btn,
  .back-btn,
  .btn-retro,
  .shortcut-item,
  .hero-badge,
  .filter-chip,
  .badge,
  .progress-bar,
  input[type="text"],
  input[type="number"],
  input[type="email"],
  input[type="password"],
  textarea,
  select,
  code {
    background: white !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    border: 1px solid #ccc !important;
    box-shadow: none !important;
  }
  
  body::before {
    display: none !important;
  }
}