```css
/* ============================================================
   91妈妈 - 溪桥流水人家，热门短剧与旅行影像
   官方品牌站样式表
   ============================================================ */

/* ---------- CSS 变量与主题 ---------- */
:root {
  --brand-primary: #2b5a3b;
  --brand-secondary: #8fbc8f;
  --brand-accent: #d4a373;
  --brand-light: #f8f9f5;
  --brand-dark: #1e2f24;
  --text-main: #1e2a1e;
  --text-secondary: #3e4e3e;
  --bg-body: #f4f7f2;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --border-light: #dce5d6;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.1);
  --radius-md: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  transition: background var(--transition-base), color var(--transition-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.dark-mode {
  --bg-body: #0f1610;
  --bg-card: #1a241a;
  --bg-glass: rgba(26, 36, 26, 0.72);
  --text-main: #e2efe2;
  --text-secondary: #b0c4b0;
  --border-light: #2e3e2e;
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
  color: var(--brand-accent);
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

ul,
ol {
  list-style: none;
}

/* ---------- 容器 ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* ---------- 吸顶导航（毛玻璃效果） ---------- */
.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 12px 0;
  gap: 12px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--brand-primary);
  letter-spacing: 1px;
  transition: transform var(--transition-fast);
  cursor: pointer;
  user-select: none;
}

.logo:hover {
  transform: scale(1.03);
}

.logo span {
  color: var(--brand-accent);
}

/* ---------- 导航链接 ---------- */
.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  font-weight: 500;
}

.nav-links li a {
  color: var(--text-main);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.nav-links li a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-accent);
  border-radius: 2px;
  transition: width var(--transition-base);
}

.nav-links li a:hover {
  color: var(--brand-primary);
  text-decoration: none;
}

.nav-links li a:hover::after {
  width: 100%;
}

/* ---------- 导航操作区 ---------- */
.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* ---------- 搜索框 ---------- */
.search-box {
  display: flex;
  border: 1px solid var(--border-light);
  border-radius: 40px;
  overflow: hidden;
  background: var(--bg-body);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(43, 90, 59, 0.12);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 8px 16px;
  font-size: 0.9rem;
  color: var(--text-main);
  outline: none;
  width: 160px;
  transition: width var(--transition-base);
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-box input:focus {
  width: 200px;
}

.search-box button {
  background: var(--brand-primary);
  border: none;
  color: #fff;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
  background: var(--brand-dark);
}

.search-box button:active {
  transform: scale(0.96);
}

/* ---------- 暗黑模式切换按钮 ---------- */
.dark-toggle {
  background: none;
  border: 1px solid var(--border-light);
  border-radius: 30px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text-main);
  transition: all var(--transition-fast);
  line-height: 1;
}

.dark-toggle:hover {
  background: var(--bg-body);
  border-color: var(--brand-primary);
  transform: rotate(15deg);
}

/* ---------- 移动端菜单按钮 ---------- */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text-main);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--bg-body);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: transparent;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 6px;
  align-items: center;
}

.breadcrumb li a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb li a:hover {
  color: var(--brand-primary);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin-left: 6px;
  color: var(--border-light);
}

/* ---------- Banner 轮播（渐变背景） ---------- */
.banner-carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 24px 0;
  box-shadow: var(--shadow-lg);
  background: var(--brand-dark);
}

.slides {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.slide {
  min-width: 100%;
  padding: 64px 48px;
  background: linear-gradient(135deg, #2b5a3b 0%, #1e3a2a 50%, #3a6b4a 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.slide::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(212, 163, 115, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.slide::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(143, 188, 143, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.slide h2 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.slide p {
  font-size: 1.15rem;
  opacity: 0.92;
  max-width: 600px;
  position: relative;
  z-index: 1;
  line-height: 1.8;
}

/* ---------- 轮播指示点 ---------- */
.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 16px 0;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.dot:hover {
  background: rgba(255, 255, 255, 0.7);
}

.dot.active {
  background: var(--brand-accent);
  transform: scale(1.3);
  border-color: rgba(255, 255, 255, 0.3);
}

/* ---------- 通用卡片 ---------- */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

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

.card h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
  color: var(--brand-primary);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text-main);
  font-weight: 700;
}

.card p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.card p:last-child {
  margin-bottom: 0;
}

/* ---------- 章节标题 ---------- */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 32px;
  color: var(--text-main);
  position: relative;
  display: inline-block;
  padding-bottom: 8px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-accent), var(--brand-secondary));
  border-radius: 4px;
  transition: width var(--transition-slow);
}

.section-title:hover::after {
  width: 100%;
}

/* ---------- 网格布局 ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

/* ---------- 数字动画 ---------- */
.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--brand-primary);
  line-height: 1.2;
  transition: color var(--transition-base);
  font-variant-numeric: tabular-nums;
}

.card:hover .stat-number {
  color: var(--brand-accent);
}

/* ---------- FAQ 手风琴 ---------- */
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 16px 0;
  transition: background var(--transition-fast);
}

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

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-main);
  padding: 8px 0;
  transition: color var(--transition-fast);
  user-select: none;
}

.faq-question:hover {
  color: var(--brand-primary);
}

.faq-question::after {
  content: '+';
  font-size: 1.6rem;
  color: var(--brand-primary);
  transition: transform var(--transition-base), color var(--transition-fast);
  font-weight: 300;
  line-height: 1;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-question::after {
  content: '−';
  transform: rotate(180deg);
  color: var(--brand-accent);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.2s ease, opacity 0.3s ease;
  color: var(--text-secondary);
  padding-right: 24px;
  line-height: 1.8;
  opacity: 0;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding-top: 12px;
  padding-bottom: 8px;
  opacity: 1;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-dark));
  color: #fff;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
  border: none;
  line-height: 1;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--brand-accent), var(--brand-primary));
}

.back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

/* ---------- 滚动动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 页脚 ---------- */
footer {
  background: linear-gradient(180deg, var(--brand-dark) 0%, #152018 100%);
  color: #d0e0d0;
  padding: 56px 0 24px;
  margin-top: 64px;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent), var(--brand-secondary));
}

footer a {
  color: #b8d0b8;
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--brand-accent);
  text-decoration: none;
}

footer h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #fff;
  position: relative;
  padding-bottom: 8px;
}

footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--brand-accent);
  border-radius: 2px;
}

footer p {
  line-height: 1.9;
  font-size: 0.95rem;
}

footer ul {
  line-height: 2.2;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: 40px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.9rem;
  color: #8aa88a;
}

.footer-bottom p {
  line-height: 2;
}

/* ---------- 文章列表 ---------- */
.article-item {
  border-bottom: 1px solid var(--border-light);
  padding: 24px 0;
  transition: padding-left var(--transition-base), background var(--transition-fast);
  position: relative;
}

.article-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--brand-accent);
  border-radius: 3px;
  transition: height var(--transition-base);
}

.article-item:hover::before {
  height: 60%;
}

.article-item:hover {
  padding-left: 16px;
}

.article-item h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  color: var(--text-main);
  transition: color var(--transition-fast);
  line-height: 1.5;
}

.article-item:hover h3 {
  color: var(--brand-primary);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  gap: 16px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.article-meta time {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more {
  font-weight: 600;
  color: var(--brand-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition-fast), color var(--transition-fast);
  margin-top: 8px;
}

.read-more:hover {
  gap: 8px;
  color: var(--brand-accent);
  text-decoration: none;
}

/* ---------- HowTo 步骤 ---------- */
.howto-step {
  background: var(--bg-card);
  border-left: 4px solid var(--brand-accent);
  padding: 20px 24px;
  margin-bottom: 16px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--brand-primary);
}

.howto-step h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--brand-primary);
  font-weight: 700;
}

.howto-step p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ---------- 图片懒加载占位 ---------- */
.lazy-svg {
  background: linear-gradient(135deg, var(--border-light) 0%, var(--bg-body) 100%);
  border-radius: var(--radius-sm);
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: shimmer 1.8s infinite linear;
  background-size: 200% 100%;
}

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

/* ---------- 通用间距 ---------- */
.mt-4 { margin-top: 32px; }
.mb-4 { margin-bottom: 32px; }
.py-4 { padding: 48px 0; }

/* ---------- 内联样式补充 ---------- */
.card[style*="text-align:center"] h3 {
  color: var(--brand-primary);
}

.card[style*="text-align:center"] p {
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
  background: var(--brand-secondary);
  border-radius: 5px;
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-primary);
}

/* ---------- 选中文本 ---------- */
::selection {
  background: var(--brand-accent);
  color: #fff;
}

/* ---------- 焦点可见性 ---------- */
:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
}

/* ============================================================
   响应式适配
   ============================================================ */

/* ---------- 平板（≤1024px） ---------- */
@media (max-width: 1024px) {
  .slide h2 {
    font-size: 2rem;
  }

  .slide p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- 手机（≤768px） ---------- */
@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .container {
    padding: 0 16px;
  }

  /* 导航 */
  .nav-inner {
    padding: 10px 0;
    gap: 8px;
  }

  .logo {
    font-size: 1.5rem;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 4px;
    padding: 12px 0;
    border-top: 1px solid var(--border-light);
    margin-top: 8px;
    animation: slideDown 0.3s ease;
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li a {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
  }

  .nav-links li a:hover {
    background: var(--bg-body);
  }

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

  .menu-toggle {
    display: block;
    order: 3;
  }

  .nav-actions {
    order: 2;
    gap: 8px;
  }

  .search-box input {
    width: 100px;
    padding: 6px 12px;
    font-size: 0.85rem;
  }

  .search-box input:focus {
    width: 130px;
  }

  .search-box button {
    padding: 6px 12px;
    font-size: 0.85rem;
  }

  .dark-toggle {
    padding: 5px 10px;
    font-size: 1rem;
  }

  /* Banner */
  .banner-carousel {
    border-radius: var(--radius-md);
    margin: 16px 0;
  }

  .slide {
    padding: 40px 24px;
    gap: 12px;
  }

  .slide h2 {
    font-size: 1.5rem;
  }

  .slide p {
    font-size: 0.95rem;
  }

  .carousel-dots {
    padding: 12px 0;
  }

  .dot {
    width: 10px;
    height: 10px;
  }

  /* 章节标题 */
  .section-title {
    font-size: 1.5rem;
    margin-bottom: 24px;
  }

  .section-title::after {
    width: 48px;
    height: 3px;
  }

  /* 卡片 */
  .card {
    padding: 20px;
    border-radius: var(--radius-sm);
  }

  .card h2 {
    font-size: 1.2rem;
  }

  .card h3 {
    font-size: 1.05rem;
  }

  /* 网格 */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 数字 */
  .stat-number {
    font-size: 2rem;
  }

  /* 文章 */
  .article-item {
    padding: 18px 0;
  }

  .article-item h3 {
    font-size: 1.05rem;
  }

  .article-item:hover {
    padding-left: 10px;
  }

  /* HowTo */
  .howto-step {
    padding: 16px 18px;
  }

  .howto-step:hover {
    transform: translateX(3px);
  }

  /* 页脚 */
  footer {
    padding: 40px 0 20px;
    margin-top: 48px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    margin-top: 28px;
    padding-top: 20px;
    font-size: 0.8rem;
  }

  /* 返回顶部 */
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.4rem;
  }

  /* 间距 */
  .py-4 {
    padding: 32px 0;
  }

  .mt-4 {
    margin-top: 24px;
  }

  .mb-4 {
    margin-bottom: 24px;
  }

  /* FAQ */
  .faq-question {
    font-size: 1rem;
    padding: 6px 0;
  }

  .faq-question::after {
    font-size: 1.4rem;
  }

  .faq-answer {
    padding-right: 16px;
    font-size: 0.95rem;
  }
}

/* ---------- 小屏手机（≤480px） ---------- */
@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

  .container {
    padding: 0 14px;
  }

  .logo {
    font-size: 1.3rem;
  }

  .search-box input {
    width: 80px;
  }

  .search-box input:focus {
    width: 100px;
  }

  .slide {
    padding: 32px 18px;
  }

  .slide h2 {
    font-size: 1.3rem;
  }

  .slide p {
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 1.3rem;
  }

  .card {
    padding: 16px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 38px;
    height: 38px;
    font-size: 1.2rem;
  }

  .breadcrumb {
    font-size: 0.8rem;
  }
}

/* ---------- 大屏优化（≥1440px） ---------- */
@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }

  .slide h2 {
    font-size: 2.8rem;
  }

  .slide p {
    font-size: 1.25rem;
  }
}

/* ---------- 减少动画偏好 ---------- */
@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;
  }

  .fade-up {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .sticky-nav,
  .back-to-top,
  .banner-carousel,
  .dark-toggle,
  .menu-toggle,
  .search-box {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .section-title::after {
    display: none;
  }
}
```