/* ============================================
   小芒果的历史私藏馆 - 国风视觉系统
   ============================================ */

/* CSS 变量定义 - 主题配色 */
:root {
  /* 浅色模式 */
  --bg-primary: #FFF9F0;      /* 温暖米白 */
  --bg-secondary: #FFF3E6;    /* 次级背景 */
  --text-primary: #2D2D2D;    /* 深灰 */
  --text-secondary: #5A5A5A;  /* 次级文字 */
  --accent-red: #E85A71;      /* 牡丹粉 */
  --accent-red-light: #F48FB1;
  --accent-gold: #F9A825;     /* 黄桃金 */
  --accent-gold-light: #FFD54F;
  --accent-peach: #FFCC80;    /* 黄桃橙 */
  --accent-green: #4A6B5D;    /* 青瓷绿 */
  --border-color: #F5E6D3;
  --shadow-color: rgba(249, 168, 37, 0.15);
  --card-bg: #FFFFFF;
  
  /* 字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  
  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* 深色模式 */
[data-theme="dark"] {
  --bg-primary: #121212;
  --bg-secondary: #1E1E1E;
  --text-primary: #E0E0E0;
  --text-secondary: #B0B0B0;
  --accent-red: #C84B4B;
  --accent-red-light: #E06060;
  --accent-gold: #D4B170;
  --accent-gold-light: #E5C890;
  --accent-green: #5A8B7D;
  --border-color: #333333;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --card-bg: #1E1E1E;
}

/* ============================================
   基础样式重置
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* 宣纸纹理背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.03;
  background-image: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.03) 2px,
      rgba(0,0,0,0.03) 4px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.02) 2px,
      rgba(0,0,0,0.02) 4px
    );
  z-index: -1;
}

a {
  color: var(--accent-red);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

img {
  max-width: 100%;
  height: auto;
}

/* ============================================
   排版
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.05em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
  text-align: justify;
}

/* 竖排文本装饰 */
.vertical-text {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.2em;
}

/* ============================================
   布局容器
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
  display: inline-block;
  width: 100%;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-gold));
  margin: var(--spacing-sm) auto 0;
}

/* ============================================
   顶部导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-normal);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.navbar-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-logo:hover {
  color: var(--accent-red);
}

/* 吉祥物图标 */
.mascot-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-gold);
  box-shadow: 0 2px 8px var(--shadow-color);
}

/* 印章效果 */
.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 2px solid var(--accent-red);
  border-radius: 4px;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  color: var(--accent-red);
  background: transparent;
  transform: rotate(-5deg);
  box-shadow: 
    inset 0 0 0 1px var(--accent-red),
    2px 2px 4px var(--shadow-color);
}

.seal-large {
  width: 60px;
  height: 60px;
  font-size: 1.2rem;
  border-width: 3px;
}

/* 搜索框 */
.search-container {
  position: relative;
  flex: 1;
  max-width: 400px;
  margin: 0 var(--spacing-lg);
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-left: 40px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-red);
  box-shadow: 0 0 0 3px rgba(166, 43, 43, 0.1);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-xs);
  max-height: 300px;
  overflow-y: auto;
  display: none;
  box-shadow: 0 4px 12px var(--shadow-color);
}

.search-results.active {
  display: block;
}

.search-result-item {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--bg-secondary);
}

.search-result-item mark {
  background: rgba(166, 43, 43, 0.2);
  color: var(--accent-red);
  padding: 0 2px;
  border-radius: 2px;
}

/* 导航链接 */
.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-link {
  color: var(--text-primary);
  font-size: 0.9rem;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent-red);
  background: var(--bg-secondary);
}

/* 深色模式切换 */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

/* 汉堡菜单（移动端） */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ============================================
   首页巨幕
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xxl) var(--spacing-md);
  padding-top: 80px;
  background: 
    linear-gradient(135deg, rgba(249, 168, 37, 0.08) 0%, transparent 50%),
    linear-gradient(225deg, rgba(232, 90, 113, 0.08) 0%, transparent 50%);
}

/* 首页吉祥物 */
.hero-mascot {
  margin-bottom: var(--spacing-lg);
}

.mascot-large {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent-gold);
  box-shadow: 0 8px 32px rgba(249, 168, 37, 0.3);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--accent-red);
  text-shadow: 2px 2px 4px var(--shadow-color);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-family: var(--font-serif);
  letter-spacing: 0.3em;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-gold);
  font-family: var(--font-serif);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ============================================
   朝代卡片网格
   ============================================ */
.dynasty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-md);
}

.dynasty-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.dynasty-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-gold));
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.dynasty-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-color);
  border-color: var(--accent-red);
}

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

.dynasty-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.dynasty-name {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--accent-red);
}

.dynasty-period {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.dynasty-tagline {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.dynasty-duration {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--accent-gold);
  margin-top: var(--spacing-sm);
}

/* ============================================
   朝代详情页
   ============================================ */
.dynasty-detail {
  padding-top: 80px;
}

.dynasty-header {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  padding: var(--spacing-xxl) 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.dynasty-header h1 {
  font-size: 3rem;
  color: var(--accent-red);
  margin-bottom: var(--spacing-sm);
}

.dynasty-header .period {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-family: var(--font-serif);
}

.dynasty-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

.meta-item {
  text-align: center;
}

.meta-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
}

.meta-value {
  font-size: 1.1rem;
  color: var(--text-primary);
  font-family: var(--font-serif);
}

/* 内容区域 */
.dynasty-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.content-section {
  margin-bottom: var(--spacing-xxl);
}

.content-section h2 {
  color: var(--accent-red);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.content-section h2::before {
  content: "◆";
  color: var(--accent-gold);
  font-size: 0.8em;
}

/* 信息卡片网格 */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.info-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: all var(--transition-fast);
}

.info-card:hover {
  border-color: var(--accent-gold);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.info-card h4 {
  color: var(--accent-gold);
  margin-bottom: var(--spacing-sm);
  font-size: 1rem;
}

.info-card p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ============================================
   时间轴
   ============================================ */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-red), var(--accent-gold));
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-lg);
  animation: fadeInUp 0.5s ease forwards;
  opacity: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--accent-red);
  border-radius: 50%;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-red);
}

.timeline-year {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--accent-gold);
  font-size: 0.9rem;
}

.timeline-title {
  font-weight: 600;
  color: var(--text-primary);
  margin: var(--spacing-xs) 0;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   人物卡片
   ============================================ */
.figures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.figure-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
}

.figure-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
  border-color: var(--accent-gold);
}

.figure-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--accent-red);
  margin-bottom: var(--spacing-xs);
}

.figure-role {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--accent-gold);
  margin-bottom: var(--spacing-sm);
}

.figure-life {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.figure-desc {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ============================================
   成就展示
   ============================================ */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.achievement-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.achievement-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-gold);
}

.achievement-item h4 {
  color: var(--accent-gold);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.achievement-item p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ============================================
   测验区域
   ============================================ */
.quiz-container {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.quiz-progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.quiz-progress-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-gold));
  transition: width var(--transition-normal);
}

.quiz-question {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.quiz-option {
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-primary);
}

.quiz-option:hover {
  border-color: var(--accent-gold);
  background: var(--bg-secondary);
}

.quiz-option.selected {
  border-color: var(--accent-red);
  background: rgba(166, 43, 43, 0.1);
}

.quiz-option.correct {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.1);
}

.quiz-option.wrong {
  border-color: #F44336;
  background: rgba(244, 67, 54, 0.1);
}

.quiz-explanation {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  display: none;
}

.quiz-explanation.show {
  display: block;
}

.quiz-score {
  text-align: center;
  padding: var(--spacing-xl);
}

.quiz-score-number {
  font-size: 3rem;
  font-family: var(--font-serif);
  color: var(--accent-gold);
}

/* ============================================
   收藏按钮
   ============================================ */
.favorite-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-primary);
}

.favorite-btn:hover {
  border-color: var(--accent-red);
}

.favorite-btn.active {
  background: var(--accent-red);
  border-color: var(--accent-red);
  color: white;
}

.favorite-btn .heart {
  font-size: 1.2rem;
}

/* ============================================
   对比表格
   ============================================ */
.compare-container {
  padding: var(--spacing-xl);
}

.compare-selectors {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  justify-content: center;
}

.compare-selector {
  flex: 1;
  max-width: 300px;
}

.compare-selector label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.compare-selector select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 1rem;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow-color);
}

.compare-table th,
.compare-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.compare-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--accent-red);
}

.compare-table tr:last-child td {
  border-bottom: none;
}

.compare-bar {
  height: 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.compare-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-gold));
  transition: width var(--transition-normal);
}

/* ============================================
   拖拽游戏
   ============================================ */
.game-container {
  padding: var(--spacing-xl);
}

.game-area {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-width: 600px;
  margin: 0 auto;
}

.game-card {
  background: var(--card-bg);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  cursor: grab;
  transition: all var(--transition-fast);
  user-select: none;
}

.game-card:active {
  cursor: grabbing;
}

.game-card.dragging {
  opacity: 0.5;
  transform: scale(1.02);
  box-shadow: 0 8px 24px var(--shadow-color);
}

.game-card.drag-over {
  border-color: var(--accent-gold);
  background: var(--bg-secondary);
}

.game-card.correct {
  border-color: #4CAF50;
  border-style: solid;
  background: rgba(76, 175, 80, 0.1);
}

.game-card.wrong {
  border-color: #F44336;
  border-style: solid;
  background: rgba(244, 67, 54, 0.1);
}

.game-controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-red), var(--accent-red-light));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(166, 43, 43, 0.3);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-gold {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-light));
  color: white;
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(197, 160, 89, 0.3);
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xxl);
  text-align: center;
}

.footer-content {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--accent-red);
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.animate-fade-in-up {
  animation: fadeInUp 0.5s ease forwards;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .achievements-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  /* 导航栏移动端 */
  .navbar-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 12px var(--shadow-color);
  }
  
  .navbar-nav.active {
    display: flex;
  }
  
  .hamburger {
    display: flex;
  }
  
  .search-container {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    max-width: none;
    margin: 0;
  }
  
  .search-container.active {
    display: block;
  }
  
  /* 首页 */
  .hero {
    min-height: auto;
    padding: var(--spacing-xxl) var(--spacing-md);
    padding-top: 100px;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
    letter-spacing: 0.1em;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  /* 朝代卡片 */
  .dynasty-grid {
    grid-template-columns: 1fr;
  }
  
  /* 详情页 */
  .dynasty-header h1 {
    font-size: 2rem;
  }
  
  .dynasty-meta {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  /* 时间轴 */
  .timeline {
    padding-left: 24px;
  }
  
  .timeline::before {
    left: 6px;
  }
  
  .timeline-item::before {
    left: -20px;
    width: 10px;
    height: 10px;
  }
  
  /* 人物卡片 */
  .figures-grid {
    grid-template-columns: 1fr;
  }
  
  /* 对比 */
  .compare-selectors {
    flex-direction: column;
    align-items: center;
  }
  
  .compare-table {
    font-size: 0.85rem;
  }
  
  .compare-table th,
  .compare-table td {
    padding: var(--spacing-sm);
  }
  
  /* 按钮 */
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }
  
  /* 统计数字 */
  .stat-number {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .hero-title {
    font-size: 1.75rem;
  }
  
  .dynasty-header h1 {
    font-size: 1.75rem;
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .dynasty-content {
    padding: var(--spacing-md);
  }
  
  .content-section h2 {
    font-size: 1.25rem;
  }
}

/* ============================================
   工具类
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.hidden { display: none !important; }

/* ============================================
   飞行动画 - 小芒果飞书效果
   ============================================ */
.flying-bird {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: none;
  width: 80px;
  height: 80px;
  filter: drop-shadow(0 4px 12px rgba(249, 168, 37, 0.5));
}

.flying-bird img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.flying-bird.active {
  opacity: 1;
}

.flying-bird.flying {
  animation: birdFly 1.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes birdFly {
  0% {
    transform: translate(0, 0) scale(0.5) rotate(-15deg);
    opacity: 0;
  }
  15% {
    transform: translate(calc(var(--fly-x) * 0.15), calc(var(--fly-y) * 0.15 - 20px)) scale(0.8) rotate(-10deg);
    opacity: 1;
  }
  30% {
    transform: translate(calc(var(--fly-x) * 0.3), calc(var(--fly-y) * 0.3 - 40px)) scale(1) rotate(5deg);
  }
  50% {
    transform: translate(calc(var(--fly-x) * 0.5), calc(var(--fly-y) * 0.5 - 30px)) scale(1.1) rotate(-3deg);
  }
  70% {
    transform: translate(calc(var(--fly-x) * 0.7), calc(var(--fly-y) * 0.7 - 15px)) scale(1.05) rotate(2deg);
  }
  85% {
    transform: translate(calc(var(--fly-x) * 0.9), calc(var(--fly-y) * 0.9 - 5px)) scale(1) rotate(-1deg);
  }
  100% {
    transform: translate(var(--fly-x), var(--fly-y)) scale(0.9) rotate(0deg);
  }
}

/* ============================================
   书本展开遮罩 - 中国传统从右向左翻书
   ============================================ */
.book-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9998;
  pointer-events: none;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  background: rgba(0, 0, 0, 0.5);
  transition: opacity 0.5s ease;
}

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

/* 古籍书本容器 */
.ancient-book {
  position: relative;
  width: 300px;
  height: 420px;
  perspective: 1500px;
}

/* 书名显示 - 在封面之上，不参与翻转 */
.book-title-display {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: bold;
  color: #8B0000;
  text-shadow: 
    2px 2px 4px rgba(0,0,0,0.3),
    0 0 20px rgba(255,255,255,0.5);
  z-index: 20;
  pointer-events: none;
  opacity: 0.95;
  letter-spacing: 0.1em;
}

/* 书本封面 */
.book-cover {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 10;
  transform-origin: left center;
  transform-style: preserve-3d;
  border-radius: 4px 12px 12px 4px;
  box-shadow: 
    0 4px 20px rgba(0,0,0,0.4),
    inset 0 0 60px rgba(139, 69, 19, 0.1);
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 4px 12px 12px 4px;
}

/* 书页堆叠 */
.book-pages {
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 5;
}

.page {
  position: absolute;
  width: 95%;
  height: 96%;
  top: 2%;
  right: 0;
  background: linear-gradient(135deg, #FFF9F0 0%, #F5E6D3 100%);
  border: 1px solid #D4C4B0;
  border-radius: 2px 10px 10px 2px;
  transform-origin: left center;
  box-shadow: 
    inset -5px 0 15px rgba(139, 69, 19, 0.08),
    2px 2px 8px rgba(0,0,0,0.1);
}

/* 纸张纹理 */
.page::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 24px,
      rgba(139, 69, 19, 0.04) 24px,
      rgba(139, 69, 19, 0.04) 25px
    );
  pointer-events: none;
}

/* 竖排文字装饰 */
.page::after {
  content: '史記';
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: rgba(139, 69, 19, 0.15);
  letter-spacing: 0.5em;
}

.page-1 { z-index: 8; right: -2px; }
.page-2 { z-index: 7; right: -4px; }
.page-3 { z-index: 6; right: -6px; }

/* 翻书动画 - 从右向左翻（中国传统）- 加速版 */
.book-overlay.active .book-cover {
  animation: flipCover 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.book-overlay.active .page-1 {
  animation: flipPage1 1s cubic-bezier(0.4, 0, 0.2, 1) 0.1s forwards;
}

.book-overlay.active .page-2 {
  animation: flipPage2 1s cubic-bezier(0.4, 0, 0.2, 1) 0.18s forwards;
}

.book-overlay.active .page-3 {
  animation: flipPage3 1s cubic-bezier(0.4, 0, 0.2, 1) 0.26s forwards;
}

/* 封面翻页 - 从右向左 */
@keyframes flipCover {
  0% {
    transform: rotateY(0deg);
  }
  40% {
    transform: rotateY(-80deg);
  }
  100% {
    transform: rotateY(-180deg);
    opacity: 0;
  }
}

/* 内页翻页 */
@keyframes flipPage1 {
  0% {
    transform: rotateY(0deg);
  }
  35% {
    transform: rotateY(-70deg);
  }
  100% {
    transform: rotateY(-175deg);
    opacity: 0;
  }
}

@keyframes flipPage2 {
  0% {
    transform: rotateY(0deg);
  }
  30% {
    transform: rotateY(-60deg);
  }
  100% {
    transform: rotateY(-170deg);
    opacity: 0;
  }
}

@keyframes flipPage3 {
  0% {
    transform: rotateY(0deg);
  }
  25% {
    transform: rotateY(-50deg);
  }
  100% {
    transform: rotateY(-165deg);
    opacity: 0;
  }
}
.visible { display: block !important; }

/* 打印样式 */
@media print {
  .navbar,
  .theme-toggle,
  .favorite-btn,
  .quiz-container,
  .game-container {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .dynasty-card,
  .figure-card,
  .achievement-item {
    break-inside: avoid;
  }
}