```css
/* =========================================================
   天堂在线 · qvceq.cn 完整样式表
   设计原则：高可读性、响应式、双主题、平滑动效
   版本：1.0.0
   ========================================================= */

/* ---------- CSS 变量与主题令牌 ---------- */
:root {
  /* 主色板（浅色模式） */
  --bg-primary: #f6f8fc;
  --bg-secondary: #ffffff;
  --bg-soft: #e9eef5;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.92);
  --text-primary: #0b1b33;
  --text-secondary: #243855;
  --text-tertiary: #3b4f6b;
  --text-quaternary: #556b85;
  --text-invert: #ffffff;
  --text-link: #1a5fb4;
  --text-link-hover: #0d3d7a;
  --border-color: #d3dce8;
  --border-light: #e4eaf2;
  --brand-primary: #0f4c81;
  --brand-secondary: #1c6fb8;
  --brand-gradient: linear-gradient(135deg, #0f4c81 0%, #1c6fb8 60%, #2a8fd6 100%);
  --brand-glow: rgba(28, 111, 184, 0.25);
  --btn-primary: #0f4c81;
  --btn-primary-hover: #0a3d66;
  --btn-primary-text: #ffffff;
  --btn-outline-color: #0f4c81;
  --btn-outline-hover: rgba(15, 76, 129, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 8px 32px var(--brand-glow);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-full: 60px;
  --navbar-bg: rgba(255, 255, 255, 0.8);
  --footer-bg: #0b1b33;
  --footer-text: #b6c4d6;
  --footer-heading: #ffffff;
  --footer-link: #b6c4d6;
  --footer-link-hover: #ffffff;
  --scrollbar-track: #e9eef5;
  --scrollbar-thumb: #b6c4d6;
  --scrollbar-thumb-hover: #8aa0b8;
  --code-bg: #f0f3f8;
}

/* 暗色主题覆盖 */
[data-theme="dark"] {
  --bg-primary: #0d1424;
  --bg-secondary: #131e30;
  --bg-soft: #1b2940;
  --bg-glass: rgba(19, 30, 48, 0.72);
  --bg-glass-strong: rgba(19, 30, 48, 0.92);
  --text-primary: #eef2f9;
  --text-secondary: #cbd5e4;
  --text-tertiary: #a8b8cf;
  --text-quaternary: #8ba0ba;
  --text-invert: #0d1424;
  --text-link: #6ab0f3;
  --text-link-hover: #9bc9ff;
  --border-color: #2b3d5c;
  --border-light: #1f2e46;
  --brand-primary: #3b82f6;
  --brand-secondary: #60a5fa;
  --brand-gradient: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 60%, #60a5fa 100%);
  --brand-glow: rgba(59, 130, 246, 0.3);
  --btn-primary: #2563eb;
  --btn-primary-hover: #1d4ed8;
  --btn-outline-color: #60a5fa;
  --btn-outline-hover: rgba(96, 165, 250, 0.12);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 8px 32px var(--brand-glow);
  --navbar-bg: rgba(13, 20, 36, 0.8);
  --footer-bg: #070c18;
  --footer-text: #8ba0ba;
  --footer-heading: #f0f4fa;
  --footer-link: #8ba0ba;
  --footer-link-hover: #ffffff;
  --scrollbar-track: #131e30;
  --scrollbar-thumb: #2b3d5c;
  --scrollbar-thumb-hover: #3b5280;
  --code-bg: #1b2940;
}

/* ---------- 基础重置与全局 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.7;
  font-size: 16px;
  font-weight: 400;
  transition: background-color 0.4s ease, color 0.4s ease;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 10px;
  border: 2px solid transparent;
  background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
  background-clip: content-box;
}

/* 选中态 */
::selection {
  background: var(--brand-primary);
  color: var(--text-invert);
}

/* 通用容器 */
.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.75rem;
  width: 100%;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1.25rem;
  }
}

/* 标题体系 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  line-height: 1.3;
  font-weight: 600;
  margin-bottom: 0.5em;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.3em;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  margin: 1.5em 0 0.8em;
  position: relative;
  padding-left: 1.2rem;
  border-left: 6px solid var(--brand-primary);
  border-radius: 0 8px 8px 0;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  margin-bottom: 0.6em;
}

h4 {
  font-size: 1.2rem;
  margin: 1.2em 0 0.5em;
}

p {
  color: var(--text-primary);
  margin-bottom: 1em;
  line-height: 1.8;
}

a {
  color: var(--text-link);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--text-link-hover);
  text-decoration: none;
}

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

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ---------- 导航栏 (毛玻璃效果) ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--navbar-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  transition: background 0.4s ease, border-color 0.4s ease;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.9rem;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.logo span {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 1rem;
  position: relative;
  padding: 0.4rem 0;
  transition: color 0.2s ease;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-primary);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-menu a:hover {
  color: var(--brand-primary);
}

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

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.3rem 0.3rem 1.2rem;
  border: 1px solid transparent;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.search-box:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.45rem 0.8rem;
  font-size: 0.95rem;
  outline: none;
  color: var(--text-primary);
  width: 160px;
  transition: width 0.3s ease;
}

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

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

.search-box button {
  background: var(--brand-gradient);
  color: var(--btn-primary-text);
  border: none;
  border-radius: var(--radius-full);
  padding: 0.55rem 1.4rem;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.search-box button:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* 主题切换按钮 */
.theme-toggle, .menu-toggle {
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--text-primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  line-height: 1;
}

.theme-toggle:hover, .menu-toggle:hover {
  background: var(--brand-primary);
  color: var(--text-invert);
  border-color: var(--brand-primary);
}

.menu-toggle {
  display: none;
}

/* 移动端导航 */
@media (max-width: 992px) {
  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--bg-glass-strong);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 1rem 1.5rem 1.5rem;
    gap: 0.8rem;
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--border-light);
    border-radius: 0 0 24px 24px;
    align-items: stretch;
  }
  
  .nav-menu.active {
    display: flex;
    animation: slideDown 0.3s ease forwards;
  }

  .nav-menu a {
    padding: 0.6rem 0.8rem;
    border-radius: 12px;
    font-size: 1.05rem;
    display: block;
  }

  .nav-menu a:hover {
    background: var(--bg-soft);
  }

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

  .search-box {
    width: 100%;
    margin: 0.5rem 0;
  }

  .search-box input {
    flex: 1;
    width: 100%;
  }

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

  .theme-toggle {
    align-self: flex-start;
  }

  .menu-toggle {
    display: flex;
    font-size: 1.6rem;
    padding: 0.3rem 0.8rem;
  }
}

/* 下拉动画 */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  background: var(--bg-soft);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  margin: 1.25rem 0;
  display: inline-block;
  border: 1px solid var(--border-light);
  color: var(--text-tertiary);
}

.breadcrumb a {
  color: var(--text-link);
  font-weight: 500;
}

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

/* ---------- Hero 首屏 ---------- */
.hero {
  background: var(--brand-gradient);
  border-radius: var(--radius-lg);
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1.8rem, 5vw, 3.5rem);
  margin: 2rem 0 3rem;
  position: relative;
  overflow: hidden;
  color: var(--text-invert);
  box-shadow: var(--shadow-lg);
}

/* 装饰光晕 */
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero h1 {
  color: var(--text-invert);
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: 0.5em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 1;
}

.hero p {
  color: rgba(255, 255, 255, 0.92);
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 700px;
  margin-bottom: 1.5rem;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 1;
}

.btn-group {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

/* 按钮样式 */
.btn-primary {
  background: var(--btn-primary-text);
  color: var(--brand-primary);
  padding: 0.8rem 2rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  display: inline-block;
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
  background: var(--bg-soft);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.8);
  color: var(--text-invert);
  padding: 0.7rem 1.8rem;
  border-radius: var(--radius-full);
  background: transparent;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--text-invert);
  transform: translateY(-3px);
}

/* ---------- 信息区块 ---------- */
.info-section {
  margin: 2.5rem 0 3rem;
}

.info-section h2 {
  margin-bottom: 0.8em;
}

/* ---------- 卡片网格 (SVG卡片) ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.svg-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 1rem 1rem 1.5rem;
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border: 1px solid var(--border-light);
  overflow: hidden;
  position: relative;
}

.svg-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--brand-primary);
}

.svg-card svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  margin-bottom: 1rem;
  transition: transform 0.4s ease;
}

.svg-card:hover svg {
  transform: scale(1.03);
}

.svg-card h3 {
  margin-top: 0.5rem;
  font-size: 1.2rem;
  margin-bottom: 0.3rem;
}

.svg-card p {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  margin: 0;
}

/* ---------- 文章卡片 ---------- */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.8rem;
  margin: 2rem 0;
}

.article-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--brand-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

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

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

.article-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.4rem;
  transition: color 0.2s ease;
}

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

.article-card .meta {
  color: var(--text-quaternary);
  font-size: 0.85rem;
  margin-bottom: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 0.8rem;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.3rem;
  font-weight: 600;
  color: var(--brand-primary);
  font-size: 0.95rem;
  transition: gap 0.2s ease;
}

.read-more:hover {
  gap: 0.6rem;
  color: var(--brand-primary);
}

.read-more::after {
  content: '→';
  transition: transform 0.2s ease;
}

/* ---------- FAQ 区块 ---------- */
.faq-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 1.3rem 1.6rem;
  margin-bottom: 0.8rem;
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  cursor: pointer;
}

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

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  gap: 1rem;
}

.faq-question span {
  transition: transform 0.3s ease;
  color: var(--brand-primary);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.faq-item.active .faq-question span {
  transform: rotate(180deg);
}

.faq-answer {
  margin-top: 1rem;
  color: var(--text-secondary);
  border-top: 1px dashed var(--border-color);
  padding-top: 0.9rem;
  display: none;
  line-height: 1.8;
  animation: fadeIn 0.3s ease;
}

.faq-item.active .faq-answer {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 观影指南 HowTo ---------- */
.howto-box {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.howto-box h3 {
  margin-bottom: 1rem;
}

.howto-box p {
  margin-bottom: 0.8rem;
  line-height: 1.8;
}

.howto-box strong {
  color: var(--brand-primary);
}

/* 步骤列表样式 */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}

.step-item {
  background: var(--bg-soft);
  padding: 1.2rem;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--brand-primary);
}

.step-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--brand-primary);
  opacity: 0.6;
  display: block;
  margin-bottom: 0.3rem;
}

/* ---------- 联系与公司 ---------- */
.contact-detail {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  background: var(--bg-secondary);
  padding: 1.8rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  margin-bottom: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  font-size: 0.95rem;
  color: var(--text-primary);
}

.contact-item svg {
  fill: var(--brand-primary);
  flex-shrink: 0;
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--brand-gradient);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer h5 {
  color: var(--footer-heading);
  margin-bottom: 1rem;
  font-size: 1.1rem;
  font-weight: 600;
  position: relative;
  display: inline-block;
}

.footer h5::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--brand-primary);
  border-radius: 2px;
}

.footer a {
  color: var(--footer-link);
  display: block;
  margin-bottom: 0.6rem;
  font-weight: 400;
  transition: color 0.2s ease, padding-left 0.2s ease;
  font-size: 0.95rem;
}

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

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  text-align: center;
  color: var(--footer-text);
  font-size: 0.9rem;
  opacity: 0.8;
}

/* ---------- 返回顶部按钮 ---------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--brand-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  padding: 0.7rem 1.1rem;
  cursor: pointer;
  font-weight: bold;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  line-height: 1;
}

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

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

/* ---------- 滚动动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* 动画延迟辅助类 */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* ---------- 统计数字 ---------- */
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ---------- 响应式细节 ---------- */
@media (max-width: 768px) {
  .hero {
    padding: 2.5rem 1.5rem;
    border-radius: var(--radius-md);
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .article-list {
    grid-template-columns: 1fr;
  }
  
  .faq-item {
    padding: 1.1rem 1.2rem;
  }
  
  .contact-detail {
    grid-template-columns: 1fr;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    padding: 0.6rem 0.9rem;
  }
  
  .footer {
    padding: 2.5rem 0 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .logo {
    font-size: 1.6rem;
  }
  
  .btn-group {
    flex-direction: column;
  }
  
  .btn-primary, .btn-outline {
    width: 100%;
    text-align: center;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 无障碍与焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--brand-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 减少动态效果偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
```