/* 伤寒初学 - taste-default skill优化版 */

:root {
  /* 主题色 */
  --accent: #c41e3a;
  --accent-hover: #a01830;
  --color-gold: #d4a853;
  --color-jade: #5a9e6f;

  /* 毛玻璃效果 */
  --glass-bg: rgba(34, 24, 20, 0.48);
  --glass-bg-hover: rgba(40, 28, 23, 0.60);
  --glass-border: rgba(255, 239, 221, 0.18);
  --glass-border-hover: rgba(212, 168, 83, 0.38);
  --glass-blur: 16px;

  /* 文字层次 - 暖白色 */
  --text-primary: #fff5eb;
  --text-secondary: rgba(255, 245, 235, 0.75);
  --text-muted: rgba(255, 245, 235, 0.5);

  /* 阴影 - 更轻 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(196, 30, 58, 0.2);

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;

  /* 表格专用 */
  --table-bg: rgba(255, 248, 240, 0.94);
  --table-text: #2c211c;
  --table-text-muted: #69584f;
  --table-header-bg: var(--accent);
  --table-header-text: #ffffff;
  --table-row-hover: rgba(0, 0, 0, 0.03);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* 字体角色 */
  --font-ui: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-title: 'Songti SC', 'STSong', 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-classic: 'FangSong', 'STFangsong', 'Songti SC', 'STSong', serif;

  /* 兼容别名 */
  --font-sans: var(--font-ui);
  --font-serif: var(--font-title);

  /* 字号 */
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 24px;
  --text-2xl: 32px;
  --text-3xl: 40px;
}

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

body {
  font-family: var(--font-ui);
  background: url('../assets/bg.jpg') no-repeat center center fixed;
  background-size: cover;
  color: white;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: linear-gradient(180deg, rgba(25, 17, 13, 0.44), rgba(25, 17, 13, 0.54));
  z-index: 0;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-4); position: relative; z-index: 1; }

/* 导航栏 */
.glass-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(30, 20, 15, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 245, 235, 0.1);
  z-index: 100;
}

.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }

.nav-brand { display: flex; align-items: center; gap: var(--space-2); color: white; text-decoration: none; font-weight: 600; }
.nav-icon { width: 32px; height: 32px; background: var(--accent); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: white; font-weight: 700; }

.nav-links { display: flex; gap: var(--space-8); list-style: none; }
.nav-links a { color: rgba(255,255,255,0.7); text-decoration: none; font-size: var(--text-sm); position: relative; }
.nav-links a:hover, .nav-links a.active { color: white; }
.nav-links .suowen-return-link {
  color: #f4c7b4;
}
.nav-links .suowen-return-link:hover,
.nav-links .suowen-return-link:focus-visible {
  color: white;
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 20%;
  right: 20%;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}
.nav-links a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-md);
}

/* 英雄区 */
.hero { padding: calc(60px + var(--space-12)) 0 var(--space-12); text-align: center; }
.hero-badge {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background: rgba(196, 30, 58, 0.2);
  border: 1px solid rgba(196, 30, 58, 0.4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--accent);
  margin-bottom: var(--space-4);
  letter-spacing: 2px;
}
.hero-title { font-size: var(--text-3xl); font-weight: 700; color: var(--text-primary); font-family: var(--font-title); margin-bottom: var(--space-4); text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2); }
.hero-subtitle { font-size: var(--text-lg); color: var(--text-secondary); margin-bottom: var(--space-8); }
.hero-actions { display: flex; gap: var(--space-4); justify-content: center; }

/* 按钮 - 只有1个主要按钮 */
.btn { padding: var(--space-3) var(--space-6); border-radius: var(--radius-md); font-family: var(--font-ui); font-size: var(--text-base); font-weight: 500; text-decoration: none; border: none; cursor: pointer; transition: all var(--transition-normal); min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
.btn-primary { background: var(--accent); color: white; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: #d6234a; box-shadow: var(--shadow-md), 0 0 12px rgba(196, 30, 58, 0.25); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0) scale(0.98); }
.btn-secondary { background: rgba(255, 245, 235, 0.1); color: var(--text-primary); border: 1px solid rgba(255, 245, 235, 0.2); }

.btn-secondary:hover { background: rgba(255, 245, 235, 0.18); border-color: rgba(255, 245, 235, 0.3); }

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 英雄区装饰线 */
.hero-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.divider-line {
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 245, 235, 0.4), transparent);
}

.divider-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(196, 30, 58, 0.15);
  border: 1px solid rgba(196, 30, 58, 0.3);
  border-radius: 50%;
  color: var(--accent);
  font-size: var(--text-sm);
  font-weight: 600;
}

/* 学习路径 */
.learning-path { padding: var(--space-6) 0 var(--space-8); text-align: center; }

.path-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-6);
}

.path-step {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 245, 235, 0.06);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
}

.path-step:hover {
  background: rgba(255, 245, 235, 0.12);
  border-color: rgba(255, 245, 235, 0.25);
}

.path-step:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.path-num {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

.path-label {
  font-weight: 500;
}

.path-arrow {
  color: var(--text-muted);
  font-size: var(--text-base);
  flex-shrink: 0;
}

/* 功能区 */
.features { padding: var(--space-12) 0; }
.section-header { text-align: center; margin-bottom: var(--space-8); }
.section-title { font-size: var(--text-xl); font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-2); text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2); }
.section-desc { color: var(--text-secondary); font-size: var(--text-base); text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15); }

.features-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-6); }

/* 卡片 */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-4px);
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* 功能卡片增强 */
.feature-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
}

.feature-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.feature-step {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.feature-meta {
  margin-top: auto;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--color-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent), #e8395a);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.feature-icon::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent), var(--color-gold));
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover .feature-icon::after {
  opacity: 0.5;
}
.feature-title { font-family: var(--font-title); font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-2); color: var(--text-primary); text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2); }
.feature-desc { font-size: var(--text-base); color: var(--text-secondary); line-height: 1.6; margin-bottom: var(--space-4); text-shadow: 0 1px 2px rgba(0, 0, 0, 0.15); }
.feature-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.feature-arrow {
  font-size: var(--text-xl);
  color: var(--accent);
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition-normal);
}
.feature-card:hover .feature-arrow {
  opacity: 1;
  transform: translateX(0);
}
.feature-card-accent {
  border-color: rgba(196, 30, 58, 0.35);
}
.feature-card-accent:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}
.feature-tags { display: flex; gap: var(--space-1); flex-wrap: wrap; }
.tag { font-size: var(--text-sm); padding: 4px 10px; background: rgba(196, 30, 58, 0.15); color: var(--text-primary); border-radius: var(--radius-sm); font-weight: 500; }

/* 统计 */
.stats { padding: var(--space-12) 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); text-align: center; }
.stat-number {
  font-size: var(--text-3xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, var(--color-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: var(--text-base); color: var(--text-secondary); text-shadow: 0 1px 2px rgba(0,0,0,0.3); }

/* 页脚 */
.footer { padding: var(--space-8) 0; text-align: center; }
.footer-text { font-size: var(--text-sm); color: var(--text-muted); }

/* 页脚增强 */
.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-icon {
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: var(--text-sm);
}

.footer-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.footer-divider {
  color: var(--text-muted);
}

/* 背诵伤寒模块样式 */
.mode-section { padding: var(--space-4) 0; }
.mode-card { padding: var(--space-4); }
.mode-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.mode-btn { display: flex; flex-direction: column; align-items: center; gap: var(--space-2); padding: var(--space-4); }
.mode-btn.active { background: rgba(196,30,58,0.2); border-color: var(--accent); }
.mode-icon { font-size: var(--text-xl); font-weight: 700; }
.mode-text { font-size: var(--text-sm); }

.category-section { padding: var(--space-4) 0; }
.stats-section { padding: var(--space-4) 0; }
.stats-card { padding: var(--space-4); }

.tiaowen-item { padding: var(--space-4); margin-bottom: var(--space-2); }
.tiaowen-item.learned { border-left: 3px solid var(--accent); }
.tiaowen-header { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-2); }
.tiaowen-id { font-weight: 600; color: var(--accent); }
.tiaowen-category { font-size: var(--text-sm); padding: 2px 8px; background: rgba(255,255,255,0.1); border-radius: var(--radius-full); color: var(--text-muted); }
.tiaowen-difficulty { color: var(--accent); font-size: var(--text-sm); }
.tiaowen-content { margin-bottom: var(--space-2); }
.tiaowen-text { font-family: var(--font-classic); font-size: var(--text-base); line-height: 1.9; letter-spacing: 0.02em; color: var(--text-primary); }
.tiaowen-info { font-size: var(--text-sm); color: var(--text-secondary); }
.tiaowen-info > div { margin-bottom: var(--space-1); }
.tiaowen-info .label { font-weight: 600; color: var(--text-primary); }
.tiaowen-info a { color: var(--accent); text-decoration: none; transition: color var(--transition-fast); }
.tiaowen-info a:hover { color: var(--color-gold); }

.list-pagination { display: flex; justify-content: center; align-items: center; gap: var(--space-4); margin-top: var(--space-4); }
.page-info { color: var(--text-secondary); }

.fill-text { font-size: var(--text-lg); line-height: 1.8; color: var(--text-primary); margin-bottom: var(--space-4); }
.option-btn { margin: var(--space-1); }
.option-btn.correct { background: rgba(90,158,111,0.3); }
.option-btn:disabled { opacity: 0.7; cursor: not-allowed; }
.correct { color: #4ade80; }
.wrong { color: #ef4444; }

.write-hint { margin-bottom: var(--space-4); padding: var(--space-4); background: rgba(255,255,255,0.1); border-radius: var(--radius-md); }
.write-input { margin-bottom: var(--space-4); }
.write-answer { padding: var(--space-4); background: rgba(255,255,255,0.1); border-radius: var(--radius-md); font-family: var(--font-classic); line-height: 1.9; letter-spacing: 0.02em; }

.mind-card { padding: var(--space-4); }
.mind-map { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.mind-category { padding: var(--space-4); background: rgba(255,255,255,0.1); border-radius: var(--radius-md); }
.mind-title { color: var(--accent); margin-bottom: var(--space-2); font-size: var(--text-lg); font-weight: 600; }
.mind-items { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.mind-item { padding: 2px 8px; background: rgba(255,255,255,0.1); border-radius: var(--radius-sm); font-size: var(--text-sm); cursor: pointer; color: var(--text-primary); transition: background var(--transition-fast); }
.mind-item:hover { background: rgba(255,255,255,0.2); }
.mind-id { font-weight: 600; color: var(--accent); margin-right: var(--space-1); }

@media (max-width: 768px) {
  .mode-grid { grid-template-columns: repeat(2, 1fr); }
  .mind-map { grid-template-columns: 1fr; }
}

/* 页面标题 */
.page-header { padding: calc(60px + var(--space-8)) 0 var(--space-8); text-align: center; }
.page-title { font-family: var(--font-title); font-size: var(--text-2xl); font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-2); }
.page-desc { color: var(--text-secondary); font-size: var(--text-base); }

/* 筛选区 */
.filter-section { padding: var(--space-4) 0; }
.filter-card { padding: var(--space-4); }
.filter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--glass-border);
}
.filter-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}
.filter-stats {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}
.filter-stat strong {
  color: var(--accent);
  font-weight: 600;
}
.filter-reset {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}
.filter-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.filter-group label { display: block; margin-bottom: var(--space-1); font-size: var(--text-sm); color: var(--text-secondary); }
.glass-input,
.glass-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 245, 235, 0.06);
  border: 1px solid rgba(255, 245, 235, 0.12);
  border-radius: var(--radius-md);
  font-family: var(--font-ui);
  font-size: var(--text-base);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.glass-input::placeholder {
  color: var(--text-muted);
}

.glass-input:focus,
.glass-select:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255, 245, 235, 0.1);
  box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.15);
}

.glass-select option {
  background: rgba(42, 31, 26, 0.95);
  color: var(--text-primary);
}

textarea.glass-input {
  min-height: 100px;
  resize: vertical;
  line-height: 1.6;
}

/* 方剂/案例卡片 */
.fang-grid, .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.fang-card, .case-card { cursor: pointer; }
.fang-card.learned,
.case-card.learned {
  border-left: 3px solid var(--color-jade);
}
.fang-card.mastered,
.case-card.mastered {
  border-left: 3px solid var(--color-gold);
}
button.fang-card {
  width: 100%;
  border: 0;
  font: inherit;
  text-align: left;
}
button.fang-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.fang-header { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-2); }
.fang-card .fang-category, .fang-card .fang-efficacy, .fang-card .fang-symptoms { display: flex; }
.fang-name, .case-title { font-family: var(--font-title); font-size: var(--text-lg); font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-2); }
.fang-liujing, .case-liujing { font-size: var(--text-sm); padding: 2px 8px; background: rgba(196,30,58,0.2); color: var(--text-primary); border-radius: var(--radius-full); }
.fang-category, .case-difficulty { font-size: var(--text-sm); color: var(--text-muted); margin-bottom: var(--space-2); }
.fang-efficacy, .case-complaint { font-size: var(--text-base); color: var(--text-secondary); margin-bottom: var(--space-4); }
.fang-symptoms, .case-symptoms { display: flex; gap: var(--space-1); flex-wrap: wrap; }
.symptom-tag { font-size: var(--text-sm); padding: 2px 8px; background: rgba(255,255,255,0.1); color: var(--text-primary); border-radius: var(--radius-sm); }

/* 表格 */
.table-responsive { overflow-x: auto; }
.glass-table { background: var(--table-bg); border-radius: var(--radius-lg); }
.glass-table th { background: var(--table-header-bg); color: var(--table-header-text); padding: 12px 16px; font-size: var(--text-sm); font-weight: 600; }
.glass-table td { padding: 12px 16px; color: var(--table-text); font-size: var(--text-sm); }
.glass-table tr:hover td { background: var(--table-row-hover); }

/* 练习区 */
.practice-card { max-width: 800px; margin: 0 auto; }
.practice-header { display: flex; justify-content: space-between; margin-bottom: var(--space-4); color: var(--text-secondary); }
.practice-question { margin-bottom: var(--space-4); color: var(--text-primary); font-size: var(--text-base); line-height: 1.6; }
.practice-options { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-4); }
.practice-option {
  padding: 12px 16px;
  background: rgba(255, 245, 235, 0.06);
  border: 1px solid rgba(255, 245, 235, 0.12);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  font-size: var(--text-base);
  transition: all var(--transition-fast);
}

.practice-option:hover {
  background: rgba(255, 245, 235, 0.1);
  border-color: rgba(255, 245, 235, 0.2);
}
.practice-option.correct { background: rgba(90,158,111,0.3); border-color: var(--color-jade); }
.practice-option.wrong { background: rgba(196,30,58,0.3); border-color: var(--accent); }
.practice-feedback { margin-bottom: var(--space-4); padding: var(--space-4); border-radius: var(--radius-md); color: var(--text-primary); }
.practice-actions { display: flex; gap: var(--space-4); justify-content: center; }

/* 框架卡片 */
.framework-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.framework-card { text-align: center; }
.framework-icon { width: 64px; height: 64px; background: var(--accent); color: white; border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; font-size: var(--text-xl); font-weight: 700; margin: 0 auto var(--space-4); box-shadow: var(--shadow-md); }
.framework-title { font-size: var(--text-lg); font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-2); }
.framework-desc { font-size: var(--text-base); color: var(--text-secondary); margin-bottom: var(--space-4); }

/* 详情卡片 */
.details-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.detail-card { padding: var(--space-6); }
.detail-header { display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-4); }
.detail-icon { width: 48px; height: 48px; background: var(--accent); color: white; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: var(--text-lg); font-weight: 600; box-shadow: var(--shadow-sm); }
.detail-title { font-family: var(--font-title); font-size: var(--text-xl); font-weight: 600; color: var(--text-primary); }
.detail-section { margin-bottom: var(--space-4); }
.detail-section-title { font-size: var(--text-sm); font-weight: 600; color: var(--text-muted); margin-bottom: var(--space-2); }
.detail-quote { padding: var(--space-4); background: rgba(196,30,58,0.1); border-radius: var(--radius-md); color: var(--text-primary); font-family: var(--font-classic); line-height: 1.9; letter-spacing: 0.02em; font-size: var(--text-base); }
.detail-list { list-style: none; }
.detail-list li { padding: var(--space-2) 0; color: var(--text-secondary); border-bottom: 1px solid var(--glass-border); font-size: var(--text-base); }

/* 加载提示 */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-8);
  color: var(--text-muted);
  font-size: var(--text-base);
}

.loading::after {
  content: '';
  width: 20px;
  height: 20px;
  margin-left: var(--space-2);
  border: 2px solid var(--glass-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.empty-state {
  text-align: center;
  padding: var(--space-8);
  color: var(--text-muted);
  font-size: var(--text-base);
}

/* 模态框增强 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--space-4);
}

.modal-card {
  background: rgba(30, 20, 15, 0.9);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 245, 235, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  max-width: 800px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--glass-border);
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(196, 30, 58, 0.3);
  border-color: var(--accent);
  color: var(--text-primary);
}

.modal-footer {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--glass-border);
}

/* 长文本阅读宽度 */
.tiaowen-detail,
.tiaowen-text,
.write-answer,
.detail-text,
.detail-quote,
.reading-content {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

/* 毛玻璃按钮增强 */
.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: var(--space-3) var(--space-6);
  background: rgba(255, 245, 235, 0.08);
  border: 1px solid rgba(255, 245, 235, 0.15);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.glass-btn:hover {
  background: rgba(255, 245, 235, 0.14);
  border-color: rgba(255, 245, 235, 0.25);
}

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

.glass-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.glass-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
}

.glass-btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.glass-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
  transform-origin: center;
}

/* 汉堡菜单动画 - 打开状态 */
.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 入场动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 页面加载动画 */
.hero {
  animation: fadeInUp 0.8s ease forwards;
}

.section-header {
  opacity: 0;
  animation: fadeInUp 0.6s ease 0.2s forwards;
}

.features-grid .glass-card {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.features-grid .glass-card:nth-child(1) { animation-delay: 0.3s; }
.features-grid .glass-card:nth-child(2) { animation-delay: 0.35s; }
.features-grid .glass-card:nth-child(3) { animation-delay: 0.4s; }
.features-grid .glass-card:nth-child(4) { animation-delay: 0.45s; }
.features-grid .glass-card:nth-child(5) { animation-delay: 0.5s; }
.features-grid .glass-card:nth-child(6) { animation-delay: 0.55s; }

.stats-grid .stat-card {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.stats-grid .stat-card:nth-child(1) { animation-delay: 0.5s; }
.stats-grid .stat-card:nth-child(2) { animation-delay: 0.6s; }
.stats-grid .stat-card:nth-child(3) { animation-delay: 0.7s; }
.stats-grid .stat-card:nth-child(4) { animation-delay: 0.8s; }

/* 骨架屏 */
@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.05) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.05) 100%
  );
  background-size: 200px 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 16px;
  margin-bottom: 8px;
}

.skeleton-title {
  height: 24px;
  width: 60%;
  margin-bottom: 12px;
}

.skeleton-card {
  height: 120px;
}

/* 响应式 */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --glass-blur: 10px;
  }

  body {
    background-attachment: scroll;
  }

  .nav-toggle {
    display: flex;
    min-width: 44px;
    min-height: 44px;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(30, 20, 15, 0.9);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-2);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    border-bottom: 1px solid rgba(255, 245, 235, 0.1);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    display: block;
  }

  .nav-links a:hover,
  .nav-links a:focus-visible {
    background: rgba(255, 255, 255, 0.1);
  }

  .nav-links a.active::after {
    display: none;
  }

  .nav-links a.active {
    background: rgba(196, 30, 58, 0.2);
  }

  .features-grid, .fang-grid, .case-grid, .framework-grid { grid-template-columns: 1fr; }
  .details-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .filter-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: var(--text-2xl); }
  .hero-subtitle { font-size: var(--text-base); }
  .container { padding: 0 var(--space-4); }

  .filter-header {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .filter-stats {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-2);
  }

  .modal-card {
    padding: var(--space-4);
    max-height: calc(100dvh - 32px);
  }

  .path-steps {
    gap: var(--space-2);
  }

  .path-step {
    padding: var(--space-2) var(--space-3);
    font-size: 13px;
  }

  .path-arrow {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero { padding: var(--space-12) 0 var(--space-8); }
  .hero-title { font-size: var(--text-xl); }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; text-align: center; min-height: 44px; }
  .features-grid { gap: var(--space-4); }
  .path-steps {
    flex-direction: column;
  }
  .path-step {
    width: 100%;
    justify-content: center;
  }
  .path-arrow {
    display: none;
  }
}

/* 应用通知 */
.glass-notification {
  position: fixed;
  top: 80px;
  right: 24px;
  max-width: min(360px, calc(100vw - 32px));
  padding: var(--space-4) var(--space-6);
  background: rgba(34, 24, 20, 0.92);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 3000;
}

.glass-notification.active {
  opacity: 1;
  transform: translateY(0);
}

/* 无障碍：减少动画 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .section-header,
  .features-grid .glass-card,
  .stats-grid .stat-card {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* 学习用途通知条 */
.learning-purpose-notice {
  width: 100%;
  background: rgba(196, 30, 58, 0.12);
  border-top: 1px solid rgba(196, 30, 58, 0.25);
  border-bottom: none;
  padding: 0;
  margin: 0;
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.learning-purpose-notice-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

.learning-purpose-notice-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(196, 30, 58, 0.25);
  color: var(--accent);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
}

.learning-purpose-notice-text {
  flex: 1;
}

.learning-purpose-notice-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.learning-purpose-notice-close {
  flex-shrink: 0;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 14px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.learning-purpose-notice-close:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--glass-border);
}

.learning-purpose-notice-close:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 首页产品定位：阅读、学习、教学练习三条路径 */
.product-lanes {
  padding: 0 0 var(--space-12);
}

.product-lanes-header {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.section-eyebrow,
.product-lane-kicker {
  color: var(--color-gold);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.section-eyebrow {
  margin-bottom: var(--space-2);
}

.product-lanes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.product-lane {
  min-height: 240px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-6);
}

.product-lane h3 {
  color: var(--text-primary);
  font-family: var(--font-title);
  font-size: var(--text-xl);
  margin: var(--space-4) 0 var(--space-3);
}

.product-lane p {
  color: var(--text-secondary);
  line-height: 1.75;
}

.product-lane .text-link {
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-top: auto;
  padding-top: var(--space-6);
  text-decoration: none;
}

.product-lane .text-link:hover,
.product-lane .text-link:focus-visible {
  color: var(--color-gold);
}

.product-lane .text-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.product-lane-caution {
  background: rgba(72, 50, 28, 0.48);
}

@media (max-width: 768px) {
  .product-lanes {
    padding-bottom: var(--space-8);
  }

  .product-lanes-grid {
    grid-template-columns: 1fr;
  }

  .product-lane {
    min-height: 0;
  }
}

/* ── 学习引导 Tab ── */
.lg-tabs {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.lg-tab {
  padding: var(--space-3) var(--space-6);
  background: rgba(255, 245, 235, 0.06);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.lg-tab:hover {
  background: rgba(255, 245, 235, 0.12);
  border-color: rgba(255, 245, 235, 0.25);
  color: var(--text-primary);
}

.lg-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-md);
}

.lg-tab--active {
  background: rgba(196, 30, 58, 0.2);
  border-color: var(--accent);
  color: var(--text-primary);
}

.lg-panel {
  text-align: center;
  padding: var(--space-6);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.lg-panel-title {
  font-family: var(--font-title);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.lg-panel-desc {
  color: var(--text-secondary);
  font-size: var(--text-base);
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: var(--space-4);
}

.lg-panel-btn {
  text-decoration: none;
}

@media (max-width: 480px) {
  .lg-tabs {
    flex-direction: column;
    align-items: stretch;
  }

  .lg-tab {
    text-align: center;
  }
}

/* ── 进阶练习区 ── */
.advanced-practice {
  padding: 0 0 var(--space-12);
}

.advanced-practice-header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

@media (max-width: 768px) {
  .advanced-grid {
    grid-template-columns: 1fr;
  }
}