```css
/* ===== 全局设计系统 ===== */
:root {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-soft: #eef2f6;
  --text-primary: #1f2937;
  --text-secondary: #334155;
  --text-muted: #475569;
  --text-heading: #0f172a;
  --text-link: #1d4ed8;
  --text-button: #ffffff;
  --border: #cbd5e1;
  --accent: #2563eb;
  --accent-dark: #1e40af;
  --accent-glow: rgba(37, 99, 235, 0.25);
  --shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.1);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --footer-bg: #0f172a;
  --footer-text: #e2e8f0;
  --footer-heading: #ffffff;
  --faq-border: #94a3b8;
  --input-bg: #ffffff;
  --placeholder: #64748b;
  --gradient-hero: linear-gradient(145deg, #e0e7ff 0%, #f0f4ff 40%, #f8fafc 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.5) 100%);
  --gradient-btn: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
  --gradient-title: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #1e40af 100%);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 50px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #0b1120;
  --bg-card: #1e293b;
  --bg-soft: #16213a;
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-heading: #f8fafc;
  --text-link: #93c5fd;
  --text-button: #0b1120;
  --border: #334155;
  --accent: #3b82f6;
  --accent-dark: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.4);
  --nav-bg: rgba(15, 23, 42, 0.9);
  --footer-bg: #020617;
  --footer-text: #cbd5e1;
  --footer-heading: #ffffff;
  --faq-border: #4b5563;
  --input-bg: #1e293b;
  --placeholder: #9ca3af;
  --gradient-hero: linear-gradient(145deg, #0f172a 0%, #1e293b 50%, #0b1120 100%);
  --gradient-card: linear-gradient(135deg, rgba(30,41,59,0.9) 0%, rgba(30,41,59,0.5) 100%);
  --gradient-btn: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --gradient-title: linear-gradient(135deg, #f8fafc 0%, #93c5fd 50%, #60a5fa 100%);
  --glass-bg: rgba(15, 23, 42, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1.2rem;
  color: var(--text-primary);
  line-height: 1.7;
}

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

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

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: clamp(3rem, 8vw, 5rem) 0;
  position: relative;
}

.section-title {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3rem;
}

.section-title h2 {
  background: var(--gradient-title);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.logo span {
  background: var(--gradient-btn);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-primary);
  padding: 6px 4px;
  position: relative;
  transition: color var(--transition);
}

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

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

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 4px 6px 4px 16px;
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

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

.search-box input {
  border: none;
  background: transparent;
  color: var(--text-primary);
  padding: 8px 12px;
  font-size: 0.95rem;
  width: 200px;
  outline: none;
}

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

.search-box button {
  background: var(--gradient-btn);
  border: none;
  color: white;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.9rem;
}

.search-box button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.theme-toggle, .menu-toggle {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.theme-toggle:hover, .menu-toggle:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: rotate(10deg);
}

.menu-toggle {
  display: none;
  font-size: 1.1rem;
}

.mobile-nav {
  display: none;
  background: var(--bg-card);
  padding: 16px;
  border-top: 1px solid var(--border);
  backdrop-filter: blur(20px);
}

.mobile-nav.active {
  display: block;
  animation: slideDown 0.3s ease;
}

.mobile-nav a {
  display: block;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.mobile-nav a:hover {
  background: var(--bg-soft);
  color: var(--accent);
  padding-left: 24px;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 按钮 ===== */
.btn {
  background: var(--gradient-btn);
  color: white;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  border: none;
  cursor: pointer;
  display: inline-block;
  font-size: 1rem;
  transition: all var(--transition);
  box-shadow: 0 4px 15px var(--accent-glow);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--accent-glow);
  color: white;
}

.btn:hover::before {
  left: 100%;
}

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

.btn-outline:hover {
  background: var(--accent);
  color: white;
}

/* ===== Hero Banner ===== */
.hero {
  padding: clamp(3rem, 8vw, 5rem) 0;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15), transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.05); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: var(--gradient-btn);
  color: white;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  margin-bottom: 20px;
  font-weight: 600;
  box-shadow: 0 4px 15px var(--accent-glow);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin-bottom: 20px;
  background: var(--gradient-title);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-img {
  position: relative;
  z-index: 1;
}

.hero-img svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-hover);
  transition: transform var(--transition-slow);
}

.hero-img:hover svg {
  transform: scale(1.02) rotate(1deg);
}

/* ===== 卡片 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.card {
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-btn);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-8px);
  border-color: var(--accent);
}

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

.card h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
}

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

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: inline-block;
  transition: transform var(--transition);
}

.card:hover .card-icon {
  transform: scale(1.2) rotate(10deg);
}

.card-tag {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card-stats {
  display: flex;
  gap: 16px;
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ===== 文章列表 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 6px solid var(--accent);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.article-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.article-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateX(8px);
  border-color: var(--accent-dark);
}

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

.article-item h4 {
  margin-bottom: 8px;
  font-size: 1.1rem;
  position: relative;
  z-index: 1;
}

.article-item .meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}

.article-item p {
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
}

.article-item a {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin-top: 8px;
  font-weight: 600;
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--faq-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition);
}

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

.faq-q {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-heading);
  transition: all var(--transition);
  font-size: 1rem;
}

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

.faq-q span:last-child {
  font-size: 1.6rem;
  font-weight: 400;
  transition: transform var(--transition);
  color: var(--accent);
  min-width: 24px;
  text-align: center;
}

.faq-item.open .faq-q span:last-child {
  transform: rotate(45deg);
}

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

.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}

.faq-a p {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== HowTo ===== */
.howto-box {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.howto-box:hover {
  box-shadow: var(--shadow-hover);
}

.howto-box ol {
  padding-left: 24px;
  counter-reset: step;
}

.howto-box li {
  margin-bottom: 16px;
  color: var(--text-primary);
  padding: 12px 16px;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  list-style: none;
  position: relative;
  padding-left: 48px;
}

.howto-box li:hover {
  background: var(--accent);
  color: white;
  transform: translateX(4px);
}

.howto-box li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.howto-box li:hover::before {
  background: white;
  color: var(--accent);
}

.howto-box li strong {
  font-weight: 600;
}

/* ===== 表格 ===== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.info-table th,
.info-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.info-table th {
  background: var(--bg-soft);
  color: var(--text-heading);
  font-weight: 600;
}

.info-table tr:last-child td {
  border-bottom: none;
}

.info-table tr {
  transition: background var(--transition);
}

.info-table tbody tr:hover {
  background: var(--bg-soft);
}

/* ===== 友情链接 ===== */
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  color: var(--footer-text);
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-pill);
  transition: all var(--transition);
  font-size: 0.9rem;
}

.footer-links a:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-2px);
  text-decoration: none;
}

/* ===== Footer ===== */
.footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 60px 0 24px;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.footer h4 {
  color: var(--footer-heading);
  margin-bottom: 20px;
  font-size: 1.1rem;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  color: var(--footer-text);
}

.copyright p {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

/* ===== 返回顶部 ===== */
.back-top {
  position: fixed;
  right: 30px;
  bottom: 30px;
  background: var(--gradient-btn);
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-hover);
  border: none;
  z-index: 999;
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

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

.back-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 20px;
  }
  
  .hero-grid {
    gap: 30px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 900px) {
  .nav-links,
  .nav-right .search-box {
    display: none;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .mobile-nav.active {
    display: block;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-badge {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-img {
    order: -1;
  }
  
  .hero-img svg {
    max-width: 90%;
    margin: 0 auto;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .section {
    padding: 3rem 0;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }
  
  .nav-wrap {
    height: 64px;
  }
  
  .logo {
    font-size: 1.5rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
  
  .back-top {
    right: 20px;
    bottom: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
  
  .article-item {
    padding: 20px;
  }
  
  .search-box input {
    width: 150px;
  }
}

/* ===== 暗色模式微调 ===== */
[data-theme="dark"] .card {
  background: var(--gradient-card);
}

[data-theme="dark"] .hero-img svg text {
  fill: var(--text-primary);
}

[data-theme="dark"] .hero-img svg rect[fill="#1e293b"],
[data-theme="dark"] .hero-img svg rect[fill="#334155"] {
  fill: #334155;
}

[data-theme="dark"] .hero-img svg rect[fill="#f8fafc"] {
  fill: var(--bg-soft);
}

/* ===== 打印样式 ===== */
@media print {
  .navbar,
  .back-top,
  .theme-toggle,
  .menu-toggle,
  .mobile-nav {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .hero {
    background: none;
    padding: 0;
  }
  
  .card,
  .article-item,
  .faq-item,
  .howto-box {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}
```