```css
/* 全局重置与变量 - 高可读性颜色系统 */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f3f6fc;
  --bg-card: #ffffff;
  --bg-footer: #1e293b;
  --text-primary: #1f2937;
  --text-secondary: #334155;
  --text-heading: #111827;
  --text-link: #1d4ed8;
  --text-footer: #cbd5e1;
  --text-footer-heading: #f1f5f9;
  --border-light: #e2e8f0;
  --brand-color: #b91c1c;
  --brand-dark: #7f1d1d;
  --btn-text: #ffffff;
  --nav-bg: rgba(255,255,255,0.95);
  --shadow: 0 4px 12px rgba(0,0,0,0.06);
  --radius: 12px;
  --gradient-hero: linear-gradient(135deg, #1e1b4b, #4c1d95);
  --gradient-card: linear-gradient(145deg, #ffffff, #f8fafc);
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(255,255,255,0.3);
  --glow: 0 0 30px rgba(185,28,28,0.15);
}
[data-theme="dark"] {
  --bg-primary: #12181f;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-footer: #0f172a;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-heading: #ffffff;
  --text-link: #93c5fd;
  --text-footer: #cbd5e1;
  --text-footer-heading: #ffffff;
  --border-light: #334155;
  --brand-color: #ef4444;
  --brand-dark: #b91c1c;
  --nav-bg: rgba(15,23,42,0.95);
  --shadow: 0 4px 12px rgba(0,0,0,0.4);
  --gradient-hero: linear-gradient(135deg, #0f172a, #1e1b4b);
  --gradient-card: linear-gradient(145deg, #1e293b, #1a2332);
  --glass-bg: rgba(30,41,59,0.7);
  --glass-border: rgba(148,163,184,0.2);
  --glow: 0 0 30px rgba(239,68,68,0.2);
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}
a { color: var(--text-link); text-decoration:none; transition: color 0.2s; }
a:hover { text-decoration:underline; color: var(--brand-color); }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* 导航栏 */
.navbar {
  position: sticky; top:0; z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow);
  transition: background 0.3s;
}
.nav-inner { display:flex; align-items:center; justify-content: space-between; height: 70px; }
.logo { font-size: 1.8rem; font-weight: 700; color: var(--brand-color); letter-spacing: 1px; position: relative; }
.logo::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-color);
  transition: width 0.3s ease;
}
.logo:hover::after { width: 100%; }
.logo span { color: var(--text-heading); }
.nav-links { display:flex; gap: 28px; font-weight:500; }
.nav-links a { color: var(--text-secondary); transition: color 0.2s, transform 0.2s; font-size: 1rem; position: relative; }
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand-color);
  transition: width 0.3s ease;
}
.nav-links a:hover { color: var(--brand-color); text-decoration:none; transform: translateY(-2px); }
.nav-links a:hover::after { width: 100%; }
.nav-right { display:flex; align-items:center; gap: 16px; }
.search-box { display:flex; background: var(--bg-secondary); border-radius: 30px; padding: 6px 14px; border:1px solid var(--border-light); transition: all 0.3s; }
.search-box:focus-within { box-shadow: 0 0 0 3px rgba(185,28,28,0.1); border-color: var(--brand-color); }
.search-box input { border:none; background:transparent; outline:none; color: var(--text-primary); width:150px; font-size: 0.95rem; }
.search-box button { background:none; border:none; cursor:pointer; color: var(--text-secondary); font-size: 1.2rem; transition: color 0.2s; }
.search-box button:hover { color: var(--brand-color); }
.theme-toggle { background:var(--bg-secondary); border:1px solid var(--border-light); border-radius:30px; padding:6px 12px; cursor:pointer; color:var(--text-primary); font-weight:500; transition: all 0.3s; }
.theme-toggle:hover { border-color: var(--brand-color); box-shadow: 0 0 10px rgba(185,28,28,0.2); }
.menu-toggle { display:none; background:none; border:none; font-size:1.8rem; color:var(--text-primary); cursor:pointer; }

/* Hero区域 */
.hero { 
  background: var(--gradient-hero); 
  color: white; 
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: heroGlow 8s ease-in-out infinite;
}
@keyframes heroGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(5%, 5%) scale(1.1); }
}
.hero-content { display:flex; align-items:center; gap: 40px; flex-wrap:wrap; position: relative; z-index: 1; }
.hero-text { flex: 1 1 400px; }
.hero-text h1 { 
  font-size: 2.8rem; 
  font-weight: 800; 
  color:white; 
  margin-bottom: 20px; 
  line-height:1.2;
  animation: fadeInUp 0.8s ease-out;
}
.hero-text p { 
  font-size: 1.2rem; 
  color:#e0e7ff; 
  margin-bottom: 30px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.btn-group { display:flex; gap: 16px; flex-wrap: wrap; }
.btn-primary { 
  background:var(--brand-color); 
  color:white; 
  padding: 12px 30px; 
  border-radius: 40px; 
  font-weight:600; 
  border:none; 
  cursor:pointer; 
  transition: all 0.3s;
  box-shadow: 0 4px 15px rgba(185,28,28,0.3);
}
.btn-primary:hover { 
  background:var(--brand-dark); 
  text-decoration:none; 
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(185,28,28,0.4);
}
.btn-outline { 
  background:transparent; 
  border:2px solid white; 
  color:white; 
  padding: 12px 30px; 
  border-radius: 40px; 
  font-weight:600; 
  cursor:pointer;
  transition: all 0.3s;
}
.btn-outline:hover { 
  background: rgba(255,255,255,0.1); 
  text-decoration: none;
  transform: translateY(-3px);
}
.hero-visual { 
  flex: 1 1 300px; 
  min-height: 240px; 
  background: var(--glass-bg); 
  border: 1px solid var(--glass-border);
  border-radius:20px; 
  display:flex; 
  align-items:center; 
  justify-content:center; 
  padding: 20px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* 通用section */
.section { padding: 70px 0; position: relative; }
.section-title { 
  font-size: 2.2rem; 
  font-weight: 700; 
  color: var(--text-heading); 
  margin-bottom: 20px; 
  text-align:center;
  position: relative;
  display: inline-block;
  width: 100%;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--brand-color);
  border-radius: 2px;
}
.section-sub { 
  text-align:center; 
  color: var(--text-secondary); 
  margin-bottom: 50px; 
  font-size:1.1rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* 卡片网格 */
.grid-4 { display:grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.grid-3 { display:grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.card { 
  background: var(--gradient-card); 
  border-radius: var(--radius); 
  padding: 28px; 
  box-shadow: var(--shadow); 
  border:1px solid var(--border-light); 
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-color), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.card:hover { 
  transform: translateY(-6px); 
  box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}
.card:hover::before { transform: scaleX(1); }
.card h3 { color: var(--text-heading); font-size: 1.3rem; margin-bottom: 12px; }
.card p { color: var(--text-secondary); }
.card .icon { 
  font-size: 2.2rem; 
  margin-bottom: 12px; 
  display: block;
  transition: transform 0.3s ease;
}
.card:hover .icon { transform: scale(1.1) rotate(5deg); }
.card h4 { color: var(--text-heading); font-size: 1.1rem; margin-bottom: 8px; }

/* 文章列表 */
.article-item { 
  background: var(--bg-card); 
  border-radius: 10px; 
  padding: 20px 24px; 
  margin-bottom: 16px; 
  border:1px solid var(--border-light);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.article-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--brand-color);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}
.article-item:hover {
  transform: translateX(6px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.08);
}
.article-item:hover::before { transform: scaleY(1); }
.article-item h4 { color: var(--text-heading); font-size: 1.2rem; transition: color 0.2s; }
.article-item:hover h4 { color: var(--brand-color); }
.article-item .date { color: var(--text-secondary); font-size: 0.9rem; margin-right: 15px; }
.article-item p { color: var(--text-secondary); margin-top: 8px; }
.read-more { font-weight: 600; color: var(--brand-color); }

/* FAQ */
.faq-item { 
  background: var(--bg-card); 
  border:1px solid var(--border-light); 
  border-radius: 10px; 
  padding: 18px 24px; 
  margin-bottom: 14px;
  transition: all 0.3s ease;
}
.faq-item:hover { 
  border-color: var(--brand-color);
  box-shadow: var(--glow);
}
.faq-question { 
  font-weight: 600; 
  color: var(--text-heading); 
  cursor:pointer; 
  display:flex; 
  justify-content: space-between; 
  align-items:center;
  transition: color 0.2s;
}
.faq-question:hover { color: var(--brand-color); }
.faq-question span { 
  font-size: 1.5rem; 
  font-weight: 300; 
  transition: transform 0.3s ease;
  color: var(--brand-color);
}
.faq-answer { 
  color: var(--text-primary); 
  margin-top: 12px;
  border-left: 3px solid var(--brand-color);
  padding-left: 16px;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* HowTo */
.howto-step { 
  display:flex; 
  gap: 18px; 
  margin-bottom: 20px;
  background: var(--bg-card);
  padding: 20px;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}
.howto-step:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow);
}
.step-num { 
  background: var(--brand-color); 
  color: white; 
  width: 36px; 
  height: 36px; 
  border-radius: 50%; 
  display:flex; 
  align-items:center; 
  justify-content:center; 
  font-weight: 700; 
  flex-shrink:0;
  box-shadow: 0 4px 10px rgba(185,28,28,0.3);
}
.howto-step p { color: var(--text-primary); }

/* 表格 */
.table-wrap { overflow-x: auto; }
table { 
  width:100%; 
  border-collapse: collapse; 
  background: var(--bg-card); 
  border-radius: 10px;
  box-shadow: var(--shadow);
}
th { 
  background: var(--bg-secondary); 
  color: var(--text-heading); 
  font-weight: 600; 
  padding: 14px; 
  text-align:left;
  border-bottom: 2px solid var(--brand-color);
}
td { 
  padding: 14px; 
  border-bottom: 1px solid var(--border-light); 
  color: var(--text-primary);
  transition: background 0.2s;
}
tr:hover td { background: var(--bg-secondary); }

/* Footer */
footer { 
  background: var(--bg-footer); 
  color: var(--text-footer); 
  padding: 60px 0 30px;
  position: relative;
}
footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--brand-color), transparent);
}
.footer-grid { display:grid; grid-template-columns: repeat(4,1fr); gap: 40px; }
.footer-col h4 { 
  color: var(--text-footer-heading); 
  margin-bottom: 16px; 
  font-size: 1.1rem;
  position: relative;
  padding-bottom: 8px;
}
.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--brand-color);
}
.footer-col a { 
  display:block; 
  color: var(--text-footer); 
  margin-bottom: 10px;
  transition: all 0.2s;
}
.footer-col a:hover { 
  color: white; 
  transform: translateX(4px);
  text-decoration: none;
}
.copyright { 
  text-align:center; 
  margin-top: 50px; 
  border-top:1px solid #334155; 
  padding-top: 20px; 
  color: var(--text-footer);
  font-size: 0.9rem;
}

/* 返回顶部 */
.back-to-top { 
  position:fixed; 
  bottom:30px; 
  right:30px; 
  background: var(--brand-color); 
  color:white; 
  width:48px; 
  height:48px; 
  border-radius:50%; 
  display:flex; 
  align-items:center; 
  justify-content:center; 
  cursor:pointer; 
  font-size:1.5rem; 
  box-shadow: var(--shadow); 
  border:none; 
  z-index:999;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--brand-dark);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(185,28,28,0.4);
}

/* 滚动动画 */
.reveal { opacity:1; transition: all 0.6s; }

/* 响应式设计 */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-text h1 { font-size: 2.2rem; }
}

@media (max-width: 900px) {
  .nav-links { 
    display:none; 
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    box-shadow: var(--shadow);
    border-bottom: 1px solid var(--border-light);
  }
  .nav-links.active { display: flex; }
  .menu-toggle { display:block; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { padding: 50px 0; }
  .hero-text h1 { font-size: 2rem; }
  .search-box { display: none; }
}

@media (max-width: 600px) {
  .grid-4 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.8rem; }
  .hero-text h1 { font-size: 1.6rem; }
  .hero-text p { font-size: 1rem; }
  .btn-group { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; text-align: center; }
  .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 1.2rem; }
  .container { padding: 0 16px; }
}

/* 打印样式 */
@media print {
  .navbar, .back-to-top, .theme-toggle, .menu-toggle { display: none; }
  body { background: white; color: black; }
  .section { padding: 20px 0; }
}
```