```css
/* ==========================================================================
   香香漫画 - gdpqzn.com
   少女恋爱漫画精选，甜宠剧情在线看
   完整样式表 - 纯CSS，无外部依赖
   ========================================================================== */

/* ==========================================================================
   1. CSS 变量与主题
   ========================================================================== */
:root {
  /* 品牌色 */
  --pink: #FF6B9D;
  --pink-dark: #E84A7F;
  --pink-light: #FFB6D0;
  --purple: #8B5CF6;
  --purple-light: #C4B5FD;

  /* 背景与表面 */
  --bg: #FFF8FB;
  --bg-alt: #FFF0F6;
  --card: #FFFFFF;
  --card-hover: #FFFCFE;

  /* 文字 */
  --text: #2D2A32;
  --text-secondary: #4A4550;
  --muted: #6B6570;

  /* 边框与阴影 */
  --border: #F3E3EB;
  --border-hover: #F0C4D8;
  --shadow-sm: 0 2px 8px rgba(255, 107, 157, 0.06);
  --shadow: 0 8px 30px rgba(255, 107, 157, 0.12);
  --shadow-lg: 0 16px 48px rgba(255, 107, 157, 0.18);

  /* 渐变 */
  --gradient-brand: linear-gradient(135deg, #FF6B9D 0%, #8B5CF6 100%);
  --gradient-hero: linear-gradient(135deg, #FFE3EE 0%, #F0E6FF 50%, #EDE4FF 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 107, 157, 0.03) 0%, rgba(139, 92, 246, 0.03) 100%);

  /* 毛玻璃 */
  --glass-bg: rgba(255, 248, 251, 0.82);
  --glass-border: rgba(255, 255, 255, 0.6);
  --glass-blur: 16px;

  /* 尺寸 */
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 22px;
  --radius-full: 999px;
  --container: 1180px;

  /* 过渡 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition: 0.3s var(--ease);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  /* 字号 */
  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-md: 16px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 34px;

  /* 行高 */
  --lh-tight: 1.35;
  --lh-normal: 1.65;
  --lh-relaxed: 1.85;
}

/* 暗色模式 */
body.dark {
  --bg: #1A1620;
  --bg-alt: #201A28;
  --card: #241E2C;
  --card-hover: #2A2333;

  --text: #F0EAF2;
  --text-secondary: #D8D0DE;
  --muted: #B4ACBB;

  --border: #3A3145;
  --border-hover: #4D4260;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);

  --gradient-hero: linear-gradient(135deg, #3A2540 0%, #332A4A 50%, #2E2545 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 107, 157, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);

  --glass-bg: rgba(26, 22, 32, 0.85);
  --glass-border: rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   2. 重置与基础
   ========================================================================== */
*,
*::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);
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

a {
  color: var(--pink-dark);
  text-decoration: none;
  transition: color var(--transition);
}

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

a:focus-visible {
  outline: 2px solid var(--pink);
  outline-offset: 2px;
  border-radius: 4px;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

input,
button,
textarea,
select {
  font: inherit;
}

ul,
ol {
  list-style: none;
}

/* 选中文字 */
::selection {
  background: var(--pink);
  color: #fff;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--pink-light);
  border-radius: var(--radius-full);
}

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

/* ==========================================================================
   3. 通用工具类
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip:focus {
  left: 10px;
  top: 10px;
  width: auto;
  height: auto;
  padding: 10px 20px;
  background: var(--pink);
  color: #fff;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
}

/* ==========================================================================
   4. 头部导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.site-header:hover {
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 16px;
}

/* 品牌 Logo */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
  transition: color var(--transition);
}

.brand:hover {
  color: var(--pink);
  text-decoration: none;
}

.brand .logo {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 19px;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(255, 107, 157, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

.brand:hover .logo {
  transform: rotate(-8deg) scale(1.05);
  box-shadow: 0 6px 20px rgba(255, 107, 157, 0.5);
}

/* 主导航 */
.main-nav ul {
  display: flex;
  gap: 4px;
  align-items: center;
  flex-wrap: wrap;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  color: var(--text-secondary);
  font-size: var(--fs-base);
  font-weight: 500;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.main-nav a:hover {
  color: var(--pink-dark);
  background: rgba(255, 107, 157, 0.08);
  text-decoration: none;
}

/* 导航工具 */
.nav-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--card);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
  border-color: var(--pink);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.15);
}

.search-box input {
  border: none;
  outline: none;
  padding: 9px 14px;
  font-size: var(--fs-sm);
  width: 140px;
  background: transparent;
  color: var(--text);
  transition: width var(--transition);
}

.search-box input::placeholder {
  color: var(--muted);
}

.search-box input:focus {
  width: 180px;
}

.search-box button {
  border: none;
  background: var(--gradient-brand);
  color: #fff;
  padding: 9px 16px;
  font-size: var(--fs-sm);
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
  white-space: nowrap;
}

.search-box button:hover {
  opacity: 0.9;
}

/* 图标按钮 */
.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  transition: all var(--transition);
  flex-shrink: 0;
}

.icon-btn:hover {
  border-color: var(--pink);
  background: rgba(255, 107, 157, 0.08);
  transform: scale(1.08);
}

.icon-btn:active {
  transform: scale(0.95);
}

.menu-toggle {
  display: none;
}

/* ==========================================================================
   5. 面包屑
   ========================================================================== */
.breadcrumb {
  padding: 16px 0;
  font-size: var(--fs-sm);
  color: var(--muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}

.breadcrumb a {
  color: var(--muted);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--pink);
  text-decoration: none;
}

.breadcrumb span {
  color: var(--pink-dark);
  font-weight: 600;
}

/* ==========================================================================
   6. Hero Banner 轮播
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 10px 0 44px;
  background: var(--gradient-hero);
  box-shadow: var(--shadow);
  transition: background var(--transition), box-shadow var(--transition);
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 107, 157, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.slides {
  position: relative;
  min-height: 360px;
}

.slide {
  display: none;
  padding: 52px 48px;
  align-items: center;
  gap: 32px;
  grid-template-columns: 1.2fr 1fr;
  animation: slideFadeIn 0.5s var(--ease);
}

.slide.active {
  display: grid;
}

@keyframes slideFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide h1 {
  font-size: var(--fs-3xl);
  line-height: var(--lh-tight);
  margin-bottom: 16px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.slide h1 em {
  font-style: normal;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--pink-dark);
}

.slide p {
  color: var(--muted);
  margin-bottom: 24px;
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
  max-width: 560px;
}

.slide-art {
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-art svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 8px 24px rgba(255, 107, 157, 0.2));
  animation: floatArt 4s ease-in-out infinite;
}

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

/* 轮播点 */
.slider-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.slider-dots button {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  border: none;
  background: rgba(255, 107, 157, 0.35);
  cursor: pointer;
  padding: 0;
  transition: all var(--transition);
}

.slider-dots button:hover {
  background: rgba(255, 107, 157, 0.6);
}

.slider-dots button.active {
  background: var(--pink);
  width: 28px;
  box-shadow: 0 2px 8px rgba(255, 107, 157, 0.4);
}

/* ==========================================================================
   7. 按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
  color: #fff;
  font-weight: 600;
  font-size: var(--fs-base);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.25s var(--ease-bounce), box-shadow 0.25s var(--ease), opacity 0.25s var(--ease);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(255, 107, 157, 0.45);
  text-decoration: none;
  color: #fff;
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: translateY(-1px) scale(0.98);
}

.btn.ghost {
  background: transparent;
  color: var(--pink-dark);
  border: 2px solid var(--pink);
  box-shadow: none;
}

.btn.ghost::after {
  background: var(--pink);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn.ghost:hover {
  color: #fff;
  box-shadow: 0 10px 28px rgba(255, 107, 157, 0.35);
}

.btn.ghost:hover::after {
  opacity: 1;
}

.btn.ghost > * {
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   8. 区块与标题
   ========================================================================== */
section {
  padding: 48px 0;
  position: relative;
}

.section-head {
  text-align: center;
  margin-bottom: 38px;
}

.section-head h2 {
  font-size: var(--fs-2xl);
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text);
  letter-spacing: -0.01em;
  position: relative;
  display: inline-block;
}

.section-head h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin: 12px auto 0;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
}

.section-head p {
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto;
  font-size: var(--fs-md);
  line-height: var(--lh-relaxed);
}

/* ==========================================================================
   9. 网格布局
   ========================================================================== */
.grid {
  display: grid;
  gap: 24px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

/* ==========================================================================
   10. 卡片
   ========================================================================== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
  background: var(--card-hover);
}

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

.card h3 {
  font-size: var(--fs-lg);
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
  line-height: 1.4;
}

.card h4 {
  font-size: var(--fs-base);
  font-weight: 700;
  margin: 16px 0 8px;
  color: var(--pink-dark);
  display: flex;
  align-items: center;
  gap: 6px;
}

.card h4::before {
  content: "";
  width: 4px;
  height: 14px;
  border-radius: 2px;
  background: var(--gradient-brand);
  flex-shrink: 0;
}

.card p {
  color: var(--muted);
  font-size: var(--fs-base);
  line-height: var(--lh-relaxed);
}

.card p + p {
  margin-top: 8px;
}

/* ==========================================================================
   11. 统计数字
   ========================================================================== */
.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
  margin-top: 32px;
  padding: 32px 20px;
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.stat {
  padding: 12px 8px;
  position: relative;
}

.stat:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -10px;
  top: 20%;
  height: 60%;
  width: 1px;
  background: var(--border);
}

.stat .num {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.2;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--pink-dark);
  font-variant-numeric: tabular-nums;
}

.stat .label {
  color: var(--muted);
  font-size: var(--fs-sm);
  margin-top: 4px;
  font-weight: 500;
}

/* ==========================================================================
   12. 文章列表
   ========================================================================== */
.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.article-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
  position: relative;
  overflow: hidden;
}

.article-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition);
}

.article-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-hover);
}

.article-item:hover::after {
  opacity: 1;
}

.article-item h3 {
  font-size: var(--fs-lg);
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
  line-height: 1.45;
  transition: color var(--transition);
}

.article-item:hover h3 {
  color: var(--pink-dark);
}

.article-meta {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin-bottom: 14px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

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

.article-meta span {
  padding: 2px 10px;
  background: rgba(255, 107, 157, 0.08);
  border-radius: var(--radius-full);
  color: var(--pink-dark);
  font-weight: 500;
  font-size: var(--fs-xs);
}

.article-item p {
  color: var(--muted);
  font-size: var(--fs-base);
  margin-bottom: 16px;
  line-height: var(--lh-relaxed);
}

.read-more {
  color: var(--pink-dark);
  font-weight: 600;
  font-size: var(--fs-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition), color var(--transition);
  text-decoration: none;
}

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

/* ==========================================================================
   13. FAQ 手风琴
   ========================================================================== */
.faq-list {
  max-width: 920px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.faq-item:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.faq-item.open {
  border-color: var(--pink-light);
  box-shadow: var(--shadow);
}

.faq-q {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: transparent;
  border: none;
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  transition: color var(--transition), background var(--transition);
  line-height: 1.5;
}

.faq-q:hover {
  color: var(--pink-dark);
  background: rgba(255, 107, 157, 0.03);
}

.faq-q .arrow {
  transition: transform 0.35s var(--ease);
  color: var(--pink);
  font-size: 14px;
  flex-shrink: 0;
  display: inline-block;
}

.faq-item.open .arrow {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease), padding 0.4s var(--ease);
  padding: 0 24px;
}

.faq-item.open .faq-a {
  max-height: 500px;
  padding-bottom: 20px;
}

.faq-a p {
  color: var(--muted);
  font-size: var(--fs-base);
  line-height: var(--lh-relaxed);
  padding-top: 4px;
  border-top: 1px dashed var(--border);
  padding-top: 16px;
}

/* ==========================================================================
   14. HowTo 步骤
   ========================================================================== */
.howto-steps {
  counter-reset: step;
  max-width: 920px;
  margin: 0 auto;
}

.step {
  position: relative;
  padding: 24px 24px 24px 76px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.step:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
  border-color: var(--border-hover);
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 22px;
  top: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: var(--fs-md);
  box-shadow: 0 4px 14px rgba(255, 107, 157, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
}

.step:hover::before {
  transform: scale(1.1) rotate(-6deg);
  box-shadow: 0 6px 20px rgba(255, 107, 157, 0.45);
}

.step h3 {
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.step p {
  color: var(--muted);
  font-size: var(--fs-base);
  line-height: var(--lh-relaxed);
}

/* ==========================================================================
   15. 页脚
   ========================================================================== */
.site-footer {
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 52px 0 24px;
  margin-top: 40px;
  transition: background var(--transition), border-color var(--transition);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-col h4 {
  font-size: var(--fs-base);
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 3px;
  border-radius: var(--radius-full);
  background: var(--gradient-brand);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
  font-size: var(--fs-sm);
  color: var(--muted);
  line-height: 1.6;
}

.footer-col a {
  color: var(--muted);
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

.footer-col a:hover {
  color: var(--pink);
  padding-left: 4px;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 22px;
  text-align: center;
  font-size: var(--fs-xs);
  color: var(--muted);
  line-height: 1.8;
}

.footer-bottom p {
  margin-bottom: 6px;
}

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

/* ==========================================================================
   16. 返回顶部
   ========================================================================== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(255, 107, 157, 0.45);
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px) scale(0.8);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease-bounce), box-shadow var(--transition);
  z-index: 90;
}

.back-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.back-top:hover {
  box-shadow: 0 10px 30px rgba(255, 107, 157, 0.6);
  transform: translateY(-4px) scale(1.05);
}

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

/* ==========================================================================
   17. 滚动动画
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 交错动画延迟 */
.grid .reveal:nth-child(1) { transition-delay: 0s; }
.grid .reveal:nth-child(2) { transition-delay: 0.08s; }
.grid .reveal:nth-child(3) { transition-delay: 0.16s; }
.grid .reveal:nth-child(4) { transition-delay: 0.24s; }
.grid .reveal:nth-child(5) { transition-delay: 0.32s; }
.grid .reveal:nth-child(6) { transition-delay: 0.4s; }

/* ==========================================================================
   18. 响应式布局
   ========================================================================== */

/* 大平板 / 小桌面 */
@media (max-width: 1024px) {
  :root {
    --fs-3xl: 30px;
    --fs-2xl: 26px;
  }

  .slide {
    padding: 40px 36px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

/* 平板 */
@media (max-width: 900px) {
  :root {
    --fs-3xl: 26px;
    --fs-2xl: 24px;
  }

  .slide.active {
    grid-template-columns: 1fr;
    padding: 32px 24px;
    gap: 20px;
  }

  .slide h1 {
    font-size: var(--fs-3xl);
  }

  .slide-art {
    max-width: 320px;
    margin: 0 auto;
  }

  .grid-3,
  .grid-2,
  .grid-4,
  .article-list {
    grid-template-columns: 1fr;
  }

  .stat-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat:nth-child(2)::after {
    display: none;
  }

  /* 移动端导航 */
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
    box-shadow: var(--shadow);
    animation: navSlideDown 0.3s var(--ease);
  }

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

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
    align-items: stretch;
  }

  .main-nav a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

  .menu-toggle {
    display: flex;
  }

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

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

  .hero {
    margin-bottom: 32px;
  }

  section {
    padding: 36px 0;
  }
}

/* 手机 */
@media (max-width: 600px) {
  :root {
    --fs-3xl: 22px;
    --fs-2xl: 21px;
    --fs-xl: 19px;
    --fs-lg: 17px;
    --fs-md: 15px;
    --fs-base: 14px;
    --fs-sm: 12px;
    --fs-xs: 11px;
    --radius: 16px;
    --radius-lg: 18px;
  }

  .container {
    padding: 0 16px;
  }

  .nav-wrap {
    padding: 10px 0;
    gap: 10px;
  }

  .brand {
    font-size: 17px;
    gap: 8px;
  }

  .brand .logo {
    width: 36px;
    height: 36px;
    font-size: 16px;
    border-radius: 11px;
  }

  .search-box {
    display: none;
  }

  .icon-btn {
    width: 36px;
    height: 36px;
    font-size: 15px;
  }

  .slide {
    padding: 26px 20px 40px;
  }

  .slide h1 {
    font-size: var(--fs-3xl);
    margin-bottom: 12px;
  }

  .slide p {
    font-size: var(--fs-base);
    margin-bottom: 18px;
  }

  .btn {
    padding: 11px 22px;
    font-size: var(--fs-sm);
  }

  .btn.ghost {
    margin-left: 0 !important;
    margin-top: 10px;
  }

  .slide-art {
    max-width: 240px;
  }

  .slides {
    min-height: 0;
  }

  .slider-dots {
    bottom: 12px;
  }

  .section-head {
    margin-bottom: 28px;
  }

  .section-head h2::after {
    width: 44px;
    height: 3px;
    margin-top: 10px;
  }

  .card,
  .article-item {
    padding: 20px;
  }

  .stat-row {
    padding: 24px 12px;
    gap: 12px;
  }

  .stat .num {
    font-size: 30px;
  }

  .stat:not(:last-child)::after {
    display: none;
  }

  .faq-q {
    padding: 16px 18px;
    font-size: var(--fs-base);
  }

  .faq-a {
    padding: 0 18px;
  }

  .faq-item.open .faq-a {
    padding-bottom: 16px;
  }

  .step {
    padding: 20px 18px 20px 64px;
  }

  .step::before {
    left: 16px;
    top: 20px;
    width: 36px;
    height: 36px;
    font-size: var(--fs-sm);
  }

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

  .site-footer {
    padding: 36px 0 20px;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
    font-size: 18px;
  }
}

/* 超小屏 */
@media (max-width: 380px) {
  .brand span:not(.logo) {
    display: none;
  }

  .slide h1 {
    font-size: 20px;
  }

  .stat-row {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   19. 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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================================
   20. 打印样式
   ========================================================================== */
@media print {
  .site-header,
  .back-top,
  .slider-dots,
  .nav-tools,
  .btn {
    display: none !important;
  }

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

  .card,
  .article-item,
  .faq-item,
  .step {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  .faq-a {
    max-height: none !important;
    overflow: visible !important;
  }

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