```css
/* ==========================================================================
   在线天堂中文 - 治愈剧集与温情电影，家庭观影时光
   完整样式表 (style.css)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 重置与基础
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 品牌色板 - 温暖治愈系 */
  --brand: #2c3e50;
  --brand-light: #34495e;
  --brand-dark: #1a252f;
  --accent: #e67e22;
  --accent-soft: #f39c12;
  --accent-glow: rgba(230, 126, 34, 0.35);
  --green: #2ecc71;
  --blue: #3498db;
  --purple: #9b59b6;

  /* 背景与表面 */
  --bg: #fdfcf8;
  --bg-alt: #f4f1ea;
  --card: #ffffff;
  --card-hover: #fffefb;
  --glass: rgba(253, 252, 248, 0.78);
  --glass-border: rgba(255, 255, 255, 0.55);

  /* 文字 */
  --text: #2c3e50;
  --text-soft: #5d6d7e;
  --text-muted: #8a9aa8;

  /* 边框与阴影 */
  --border: #e0dcd3;
  --border-light: #ece8e0;
  --shadow-sm: 0 2px 8px rgba(44, 62, 80, 0.06);
  --shadow: 0 4px 20px rgba(44, 62, 80, 0.08);
  --shadow-lg: 0 12px 32px rgba(44, 62, 80, 0.12);
  --shadow-glow: 0 8px 28px rgba(230, 126, 34, 0.28);

  /* 圆角 */
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;

  /* 字体 */
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Roboto Mono", Consolas, monospace;

  /* 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);
  --transition-fast: 0.2s var(--ease);
  --transition-slow: 0.5s var(--ease);

  /* 布局 */
  --header-h: 68px;
  --container: 1160px;
}

/* --------------------------------------------------------------------------
   2. 全局元素
   -------------------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input {
  font-family: inherit;
}

::selection {
  background: var(--accent-soft);
  color: #fff;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-alt);
}

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

/* --------------------------------------------------------------------------
   3. 布局容器
   -------------------------------------------------------------------------- */
.container {
  width: min(var(--container), 92%);
  margin-inline: auto;
}

section {
  padding: 64px 0;
  position: relative;
}

.bg-alt {
  background: var(--bg-alt);
  transition: background-color var(--transition-slow);
}

/* --------------------------------------------------------------------------
   4. 导航栏 - 毛玻璃效果
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass);
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition), background var(--transition-slow);
}

.site-header.scrolled {
  box-shadow: var(--shadow);
  background: var(--glass);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  gap: 16px;
  min-height: var(--header-h);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--brand);
  letter-spacing: 0.5px;
  white-space: nowrap;
  transition: transform var(--transition-fast);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--brand);
}

.logo svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(44, 62, 80, 0.2);
  transition: transform var(--transition), box-shadow var(--transition);
}

.logo:hover svg {
  transform: rotate(-6deg);
  box-shadow: 0 6px 18px rgba(241, 196, 15, 0.35);
}

/* 导航链接 */
.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}

.nav-links a {
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-soft);
  position: relative;
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 3px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-links a:hover {
  background: var(--bg-alt);
  color: var(--brand);
  transform: translateY(-1px);
}

.nav-links a:hover::after {
  width: 60%;
}

/* 导航操作区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* 搜索框 */
.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box input {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 9px 14px 9px 38px;
  font-size: 0.9rem;
  width: 180px;
  color: var(--text);
  transition: width var(--transition), border-color var(--transition-fast),
    box-shadow var(--transition-fast), background var(--transition-slow);
}

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

.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  width: 220px;
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.search-box svg {
  position: absolute;
  left: 12px;
  width: 17px;
  height: 17px;
  opacity: 0.5;
  pointer-events: none;
  color: var(--text-soft);
  transition: opacity var(--transition-fast);
}

.search-box:focus-within svg {
  opacity: 0.9;
  color: var(--accent);
}

/* 主题切换 & 菜单按钮 */
.theme-toggle,
.menu-toggle {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 1.05rem;
  color: var(--text);
  transition: transform var(--transition-fast), background var(--transition-fast),
    box-shadow var(--transition-fast);
}

.theme-toggle:hover,
.menu-toggle:hover {
  transform: scale(1.06) rotate(6deg);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:active,
.menu-toggle:active {
  transform: scale(0.96);
}

.menu-toggle {
  display: none;
}

/* --------------------------------------------------------------------------
   5. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
  font-size: 0.86rem;
  color: var(--text-soft);
  padding: 16px 0 0;
}

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

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li::after {
  content: "›";
  margin-left: 6px;
  color: var(--border);
  font-weight: 700;
}

.breadcrumb li:last-child::after {
  content: "";
}

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

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

/* --------------------------------------------------------------------------
   6. Hero Banner - 渐变轮播
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 55%, #0f151b 100%);
  color: #fff;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  overflow: hidden;
  margin-bottom: 8px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 78% 22%, rgba(243, 156, 18, 0.18), transparent 45%),
    radial-gradient(circle at 12% 82%, rgba(46, 204, 113, 0.12), transparent 42%);
  pointer-events: none;
}

.hero-slides {
  position: relative;
  min-height: 440px;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s var(--ease), visibility 0.8s var(--ease);
  display: flex;
  align-items: center;
  padding: 60px 0;
}

.hero-slide.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  width: 100%;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.9rem);
  line-height: 1.32;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
  font-weight: 800;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}

.hero h1 .accent {
  color: var(--accent-soft);
  position: relative;
  background: linear-gradient(120deg, var(--accent-soft), #ffd166);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.05rem;
  opacity: 0.92;
  margin-bottom: 22px;
  max-width: 640px;
  color: #e8ecf1;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.hero-tags span {
  background: rgba(255, 255, 255, 0.1);
  padding: 5px 15px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.hero-tags span:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: #fff;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(230, 126, 34, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.6s var(--ease);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.btn:hover::before {
  transform: translateX(120%);
}

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

.btn svg {
  transition: transform var(--transition-fast);
}

.btn:hover svg {
  transform: translateX(3px);
}

.btn-ghost {
  background: transparent;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  margin-left: 12px;
  box-shadow: none;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  box-shadow: none;
  border-color: rgba(255, 255, 255, 0.8);
}

/* Hero 插画 */
.hero-art {
  display: grid;
  place-items: center;
}

.hero-art svg {
  width: 100%;
  max-width: 320px;
  filter: drop-shadow(0 12px 30px rgba(0, 0, 0, 0.35));
  animation: heroFloat 6s ease-in-out infinite;
}

@keyframes heroFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

/* 轮播指示点 */
.hero-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}

.hero-dots button {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  border: none;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition);
  padding: 0;
}

.hero-dots button:hover {
  background: rgba(255, 255, 255, 0.7);
}

.hero-dots button.active {
  background: var(--accent-soft);
  width: 28px;
  box-shadow: 0 0 12px rgba(243, 156, 18, 0.6);
}

/* --------------------------------------------------------------------------
   7. 区块标题
   -------------------------------------------------------------------------- */
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 42px;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  color: var(--brand);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
  padding-bottom: 14px;
  font-weight: 800;
  letter-spacing: 0.3px;
}

.section-head h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 64px;
  height: 3px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  box-shadow: 0 2px 10px var(--accent-glow);
}

.section-head p {
  color: var(--text-soft);
  font-size: 1.02rem;
}

/* --------------------------------------------------------------------------
   8. 网格系统
   -------------------------------------------------------------------------- */
.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);
}

/* --------------------------------------------------------------------------
   9. 卡片 - 圆角 + hover 动画
   -------------------------------------------------------------------------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition-fast), background var(--transition-slow);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft), var(--green));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  background: var(--card-hover);
}

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

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--brand);
  font-weight: 700;
  line-height: 1.45;
}

.card p {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.card strong {
  color: var(--brand);
  font-weight: 600;
}

/* 卡片图标 */
.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--bg-alt), var(--card));
  border: 1px solid var(--border-light);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover .card-icon {
  transform: scale(1.08) rotate(-4deg);
  box-shadow: 0 6px 18px rgba(44, 62, 80, 0.12);
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

/* --------------------------------------------------------------------------
   10. 数字统计
   -------------------------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stats > div {
  padding: 24px 12px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stats > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  color: var(--text-soft);
  font-size: 0.92rem;
  margin-top: 6px;
}

/* --------------------------------------------------------------------------
   11. 文章卡片
   -------------------------------------------------------------------------- */
.article-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition-fast);
}

.article-card::after {
  content: "";
  position: absolute;
  top: -60%;
  right: -60%;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

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

.article-meta {
  display: flex;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  flex-wrap: wrap;
}

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

.article-meta span:last-child {
  color: var(--accent);
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.08rem;
  margin-bottom: 8px;
  line-height: 1.5;
  color: var(--brand);
  font-weight: 700;
  transition: color var(--transition-fast);
}

.article-card:hover h3 {
  color: var(--accent);
}

.article-card p {
  font-size: 0.92rem;
  color: var(--text-soft);
  flex: 1;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 14px;
  align-self: flex-start;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.read-more:hover {
  gap: 10px;
  color: var(--accent-soft);
}

/* --------------------------------------------------------------------------
   12. FAQ 手风琴
   -------------------------------------------------------------------------- */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition-fast),
    transform var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--accent-soft);
}

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

.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--brand);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  line-height: 1.5;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.faq-q:hover {
  color: var(--accent);
  background: var(--bg-alt);
}

.faq-q .arrow {
  transition: transform var(--transition);
  flex-shrink: 0;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--accent);
}

.faq-item.open .faq-q {
  color: var(--accent);
}

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

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease), padding var(--transition);
  padding: 0 22px;
}

.faq-item.open .faq-a {
  max-height: 500px;
  padding-bottom: 18px;
}

.faq-a p {
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   13. HowTo 步骤
   -------------------------------------------------------------------------- */
.howto-steps {
  counter-reset: step;
  display: grid;
  gap: 18px;
}

.howto-step {
  position: relative;
  padding: 22px 22px 22px 78px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition-fast);
}

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

.howto-step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 22px;
  top: 22px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 4px 14px var(--accent-glow);
  transition: transform var(--transition);
}

.howto-step:hover::before {
  transform: scale(1.1) rotate(-8deg);
}

.howto-step h4 {
  margin-bottom: 8px;
  color: var(--brand);
  font-size: 1.05rem;
  font-weight: 700;
}

.howto-step p {
  color: var(--text-soft);
  font-size: 0.94rem;
}

/* --------------------------------------------------------------------------
   14. 联系信息
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  padding: 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.contact-item:hover {
  background: var(--card);
  transform: translateX(4px);
}

.contact-item .ci-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--bg-alt), var(--card));
  border: 1px solid var(--border-light);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: transform var(--transition), box-shadow var(--transition);
}

.contact-item:hover .ci-icon {
  transform: scale(1.08);
  box-shadow: var(--shadow-sm);
}

.contact-item .ci-icon svg {
  width: 22px;
  height: 22px;
}

.contact-item strong {
  display: block;
  margin-bottom: 2px;
  color: var(--brand);
  font-weight: 700;
}

.contact-item span {
  color: var(--text-soft);
  font-size: 0.94rem;
  word-break: break-word;
}

/* --------------------------------------------------------------------------
   15. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  background: linear-gradient(160deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #cbd5e0;
  padding: 56px 0 24px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(230, 126, 34, 0.12), transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 32px;
  margin-bottom: 36px;
  position: relative;
  z-index: 1;
}

.site-footer h4 {
  color: #fff;
  font-size: 1.02rem;
  margin-bottom: 16px;
  font-weight: 700;
  position: relative;
  padding-bottom: 10px;
}

.site-footer h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
}

.site-footer p {
  font-size: 0.92rem;
  line-height: 1.8;
  color: #cbd5e0;
}

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

.site-footer li {
  margin-bottom: 9px;
  font-size: 0.92rem;
}

.site-footer a {
  color: #cbd5e0;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.site-footer a:hover {
  color: var(--accent-soft);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}

.footer-bottom a {
  color: #cbd5e0;
}

.footer-bottom a:hover {
  color: var(--accent-soft);
}

/* --------------------------------------------------------------------------
   16. 返回顶部
   -------------------------------------------------------------------------- */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: #fff;
  border: none;
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: all var(--transition);
  z-index: 900;
  box-shadow: var(--shadow-glow);
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 10px 28px rgba(230, 126, 34, 0.5);
}

.back-top:active {
  transform: translateY(-2px) scale(1);
}

/* --------------------------------------------------------------------------
   17. 滚动揭示动画
   -------------------------------------------------------------------------- */
.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: none;
}

/* 子元素错峰动画 */
.reveal.visible .card,
.reveal.visible .article-card,
.reveal.visible .howto-step {
  animation: fadeInUp 0.6s var(--ease) both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   18. 暗色模式
   -------------------------------------------------------------------------- */
body.dark {
  --brand: #e8ecf1;
  --brand-light: #cbd5e0;
  --brand-dark: #12171d;
  --bg: #1a1f26;
  --bg-alt: #222831;
  --card: #262d36;
  --card-hover: #2b333d;
  --glass: rgba(26, 31, 38, 0.82);
  --glass-border: rgba(255, 255, 255, 0.08);
  --text: #e8ecf1;
  --text-soft: #a8b3c0;
  --text-muted: #7a8794;
  --border: #333c47;
  --border-light: #2c343e;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  --accent-glow: rgba(230, 126, 34, 0.4);
}

body.dark .site-header {
  background: var(--glass);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

body.dark .hero {
  background: linear-gradient(135deg, #1a252f 0%, #12171d 55%, #0a0e12 100%);
}

body.dark .hero::before {
  background: radial-gradient(circle at 78% 22%, rgba(243, 156, 18, 0.14), transparent 45%),
    radial-gradient(circle at 12% 82%, rgba(46, 204, 113, 0.1), transparent 42%);
}

body.dark .site-footer {
  background: linear-gradient(160deg, #12171d 0%, #0a0e12 100%);
}

body.dark .card-icon,
body.dark .ci-icon {
  background: linear-gradient(135deg, #2c343e, #262d36);
}

body.dark .search-box input {
  background: var(--card);
  color: var(--text);
}

body.dark .theme-toggle,
body.dark .menu-toggle {
  background: var(--bg-alt);
  border-color: var(--border);
}

body.dark ::-webkit-scrollbar-track {
  background: #1a1f26;
}

body.dark ::-webkit-scrollbar-thumb {
  background: #333c47;
  border-color: #1a1f26;
}

body.dark ::-webkit-scrollbar-thumb:hover {
  background: #4a5563;
}

body.dark .stat-num {
  background: linear-gradient(135deg, var(--accent-soft), #ffd166);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.dark .section-head h2 {
  color: var(--text);
}

body.dark .card h3,
body.dark .article-card h3,
body.dark .howto-step h4,
body.dark .faq-q,
body.dark .contact-item strong {
  color: var(--text);
}

body.dark .faq-q:hover {
  background: var(--bg-alt);
}

body.dark .hero h1 {
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------------------------
   19. 响应式 - 平板
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-inner {
    gap: 28px;
  }

  .hero h1 {
    font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .footer-grid > div:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 920px) {
  section {
    padding: 52px 0;
  }

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

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid > div:last-child {
    grid-column: auto;
  }

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

  .hero-art {
    display: none;
  }

  .hero-slides {
    min-height: 400px;
  }

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

  .stats {
    gap: 16px;
  }

  .stat-num {
    font-size: 2rem;
  }
}

/* --------------------------------------------------------------------------
   20. 响应式 - 手机
   -------------------------------------------------------------------------- */
@media (max-width: 680px) {
  :root {
    --header-h: 62px;
  }

  body {
    font-size: 15px;
  }

  section {
    padding: 44px 0;
  }

  .container {
    width: 92%;
  }

  /* 移动端导航 */
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--card);
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-130%);
    transition: transform 0.35s var(--ease);
    z-index: 999;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-links a {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
  }

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

  .menu-toggle {
    display: grid;
  }

  .search-box input {
    width: 120px;
    padding: 8px 10px 8px 34px;
    font-size: 0.85rem;
  }

  .search-box input:focus {
    width: 150px;
  }

  .search-box svg {
    left: 10px;
    width: 15px;
    height: 15px;
  }

  .logo span {
    font-size: 1.05rem;
  }

  .logo svg {
    width: 32px;
    height: 32px;
  }

  /* 网格单列 */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stats > div {
    padding: 18px 8px;
  }

  .stat-num {
    font-size: 1.7rem;
  }

  .stat-label {
    font-size: 0.82rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }

  /* Hero 移动端 */
  .hero-slides {
    min-height: 520px;
  }

  .hero-slide {
    padding: 44px 0 60px;
    align-items: flex-start;
  }

  .hero h1 {
    font-size: clamp(1.5rem, 6vw, 2rem);
    line-height: 1.35;
  }

  .hero p {
    font-size: 0.96rem;
  }

  .hero-tags span {
    font-size: 0.78rem;
    padding: 4px 12px;
  }

  .btn {
    padding: 11px 22px;
    font-size: 0.95rem;
  }

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

  .hero-dots {
    bottom: 14px;
  }

  /* 卡片内边距 */
  .card {
    padding: 22px;
  }

  .article-card {
    padding: 20px;
  }

  .section-head {
    margin-bottom: 32px;
  }

  .section-head h2 {
    font-size: 1.45rem;
  }

  .section-head p {
    font-size: 0.94rem;
  }

  /* HowTo 移动端 */
  .howto-step {
    padding: 20px 18px 20px 66px;
  }

  .howto-step::before {
    left: 16px;
    top: 20px;
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }

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

  /* FAQ 移动端 */
  .faq-q {
    padding: 15px 18px;
    font-size: 0.95rem;
  }

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

  .faq-item.open .faq-a {
    padding-bottom: 15px;
  }

  /* 返回顶部 */
  .back-top {
    right: 16px;
    bottom: 20px;
    width: 44px;
    height: 44px;
  }

  /* 联系 */
  .contact-item {
    padding: 10px 8px;
  }

  .contact-item:hover {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   21. 超小屏
   -------------------------------------------------------------------------- */
@media (max-width: 380px) {
  .nav-wrap {
    gap: 8px;
  }

  .search-box {
    display: none;
  }

  .logo span {
    font-size: 0.95rem;
  }

  .theme-toggle,
  .menu-toggle {
    width: 38px;
    height: 38px;
    font-size: 0.95rem;
  }

  .hero h1 {
    font-size: 1.35rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .btn-ghost {
    margin-top: 8px;
  }
}

/* --------------------------------------------------------------------------
   22. 无障碍与动画偏好
   -------------------------------------------------------------------------- */
@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;
  }

  .hero-art svg {
    animation: none;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  :root {
    --border: #000;
    --text-soft: #333;
  }

  .card,
  .article-card,
  .faq-item {
    border-width: 2px;
  }
}

/* --------------------------------------------------------------------------
   23. 打印样式
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .back-top,
  .hero-dots,
  .theme-toggle,
  .menu-toggle,
  .search-box,
  .site-footer {
    display: none !important;
  }

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

  .hero {
    background: #fff;
    color: #000;
    border-radius: 0;
  }

  .hero h1 .accent {
    -webkit-text-fill-color: #000;
    color: #000;
  }

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

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

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

/* --------------------------------------------------------------------------
   24. 工具类
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.text-accent {
  color: var(--accent);
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
```