```css
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f3f6fc;
  --bg-card: #ffffff;
  --text-primary: #1F2937;
  --text-secondary: #2D3B4F;
  --text-muted: #334155;
  --text-link: #1D4ED8;
  --text-heading: #111827;
  --border-color: #d1d5db;
  --nav-bg: #ffffff;
  --footer-bg: #1F2937;
  --footer-text: #E5E7EB;
  --btn-bg: #1D4ED8;
  --btn-text: #ffffff;
  --accent: #1E3A8A;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #1F2937;
  --bg-secondary: #111827;
  --bg-card: #1F2937;
  --text-primary: #F1F5F9;
  --text-secondary: #E2E8F0;
  --text-muted: #CBD5E1;
  --text-link: #93C5FD;
  --text-heading: #FFFFFF;
  --border-color: #374151;
  --nav-bg: #111827;
  --footer-bg: #0B1120;
  --footer-text: #E5E7EB;
  --btn-bg: #3B82F6;
  --btn-text: #ffffff;
  --glass-bg: rgba(17, 24, 39, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

* {
  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', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 */
.navbar {
  background: var(--nav-bg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: var(--glass-bg);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: 1280px;
  margin: auto;
  gap: 16px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.02);
}

.logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 2px 4px rgba(225, 29, 72, 0.3));
}

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

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

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

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

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

.menu-toggle:hover {
  background: var(--bg-secondary);
}

.theme-toggle,
.search-toggle {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.theme-toggle:hover,
.search-toggle:hover {
  background: var(--bg-secondary);
  transform: rotate(15deg);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 30px;
  padding: 4px 8px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.search-box:focus-within {
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1);
  border-color: var(--text-link);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 8px 12px;
  color: var(--text-primary);
  outline: none;
  width: 180px;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.search-box button {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 30px;
  padding: 8px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.search-box button:hover {
  background: var(--accent);
  transform: scale(1.05);
}

/* Banner */
.banner {
  background: linear-gradient(135deg, #1E3A8A 0%, #2b4a9b 50%, #3B82F6 100%);
  color: white;
  padding: 60px 0;
  border-radius: 0 0 40px 40px;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: float 6s ease-in-out infinite;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

.banner-content {
  max-width: 800px;
  position: relative;
  z-index: 1;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.banner h1 {
  font-size: 3rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  line-height: 1.2;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.banner p {
  font-size: 1.2rem;
  color: #E5E7EB;
  margin-bottom: 24px;
  line-height: 1.8;
}

.btn-primary {
  background: #ffffff;
  color: #1E3A8A;
  padding: 12px 28px;
  border-radius: 40px;
  font-weight: 700;
  display: inline-block;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.3);
}

.btn-outline {
  border: 2px solid #E5E7EB;
  color: #E5E7EB;
  padding: 10px 24px;
  border-radius: 40px;
  margin-left: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #ffffff;
  transform: translateY(-2px);
}

/* 卡片区 */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-heading);
  margin: 40px 0 24px;
  position: relative;
  transition: var(--transition);
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--text-link), transparent);
  margin-top: 8px;
  border-radius: 2px;
  transition: var(--transition);
}

.section-title:hover::after {
  width: 80px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--text-link), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

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

.card h3 {
  font-size: 1.3rem;
  color: var(--text-heading);
  margin-bottom: 10px;
  transition: var(--transition);
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
}

.card a {
  color: var(--text-link);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.card a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.badge {
  display: inline-block;
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 4px 12px;
  border-radius: 30px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-right: 8px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.badge:hover {
  background: var(--text-link);
  color: white;
  border-color: var(--text-link);
}

/* 文章列表 */
.article-list {
  list-style: none;
}

.article-list li {
  border-bottom: 1px solid var(--border-color);
  padding: 18px 0;
  transition: var(--transition);
  animation: fadeInUp 0.5s ease-out;
  animation-fill-mode: both;
}

.article-list li:nth-child(2) { animation-delay: 0.1s; }
.article-list li:nth-child(3) { animation-delay: 0.2s; }
.article-list li:nth-child(4) { animation-delay: 0.3s; }
.article-list li:nth-child(5) { animation-delay: 0.4s; }
.article-list li:nth-child(6) { animation-delay: 0.5s; }
.article-list li:nth-child(7) { animation-delay: 0.6s; }
.article-list li:nth-child(8) { animation-delay: 0.7s; }
.article-list li:nth-child(9) { animation-delay: 0.8s; }
.article-list li:nth-child(10) { animation-delay: 0.9s; }

.article-list li:hover {
  padding-left: 12px;
  background: var(--bg-secondary);
}

.article-list h4 {
  color: var(--text-heading);
  font-size: 1.2rem;
  margin-bottom: 6px;
  transition: var(--transition);
}

.article-list li:hover h4 {
  color: var(--text-link);
}

.article-list p {
  color: var(--text-secondary);
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* FAQ */
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--bg-card);
  transition: var(--transition);
}

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

.faq-question {
  padding: 18px 20px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  background: var(--bg-secondary);
  color: var(--text-heading);
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover {
  background: var(--bg-primary);
}

.faq-question span {
  transition: var(--transition);
  font-size: 1.2rem;
}

.faq-item.active .faq-question span {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 20px 20px;
  color: var(--text-secondary);
  display: none;
  line-height: 1.8;
  animation: fadeInUp 0.3s ease-out;
}

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

/* HowTo */
.howto-step {
  background: var(--bg-secondary);
  padding: 18px;
  border-radius: 12px;
  margin-bottom: 12px;
  border-left: 6px solid var(--text-link);
  transition: var(--transition);
}

.howto-step:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-sm);
}

.howto-step h4 {
  color: var(--text-heading);
  margin-bottom: 6px;
  font-size: 1.1rem;
}

.howto-step p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 40px 0 20px;
  margin-top: 60px;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--text-link), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
}

footer h5 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 12px;
  position: relative;
}

footer h5::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--text-link);
  transition: var(--transition);
}

footer h5:hover::after {
  width: 50px;
}

footer a {
  color: var(--footer-text);
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
  transition: var(--transition);
  position: relative;
  padding-left: 0;
}

footer a:hover {
  color: #93C5FD;
  padding-left: 8px;
}

.copyright {
  border-top: 1px solid #374151;
  margin-top: 30px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.9rem;
}

/* 其他 */
.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.mt-2 {
  margin-top: 12px;
}

.back-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
  z-index: 200;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.back-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  background: var(--accent);
}

/* 数字动画 */
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-heading);
  transition: var(--transition);
}

/* 滚动动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.card-grid > * {
  animation: fadeInUp 0.6s ease-out;
  animation-fill-mode: both;
}

.card-grid > *:nth-child(2) { animation-delay: 0.1s; }
.card-grid > *:nth-child(3) { animation-delay: 0.2s; }
.card-grid > *:nth-child(4) { animation-delay: 0.3s; }
.card-grid > *:nth-child(5) { animation-delay: 0.4s; }
.card-grid > *:nth-child(6) { animation-delay: 0.5s; }

/* 移动端 */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .nav-container {
    flex-wrap: wrap;
    padding: 12px 16px;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: var(--nav-bg);
    padding: 12px;
    gap: 12px;
    position: absolute;
    top: 60px;
    left: 0;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }

  .nav-links.active {
    display: flex;
    animation: fadeIn 0.3s ease-out;
  }

  .menu-toggle {
    display: block;
  }

  .banner {
    padding: 40px 0;
    border-radius: 0 0 24px 24px;
  }

  .banner h1 {
    font-size: 2rem;
  }

  .banner p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .search-box {
    display: none;
  }

  .search-box.active {
    display: flex;
    width: 100%;
    margin-top: 8px;
  }

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

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

  .btn-outline {
    margin-left: 0;
    margin-top: 12px;
    display: inline-block;
  }

  .back-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}

/* 小屏幕 */
@media (max-width: 480px) {
  .logo {
    font-size: 1.4rem;
  }

  .logo svg {
    width: 28px;
    height: 28px;
  }

  .banner h1 {
    font-size: 1.6rem;
  }

  .banner p {
    font-size: 0.95rem;
  }

  .btn-primary,
  .btn-outline {
    padding: 10px 20px;
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 1.3rem;
    margin: 30px 0 20px;
  }

  .card {
    padding: 16px;
  }

  .article-list h4 {
    font-size: 1rem;
  }

  .faq-question {
    padding: 14px 16px;
    font-size: 0.95rem;
  }
}

/* 打印样式 */
@media print {
  .navbar,
  .back-top,
  .menu-toggle,
  .theme-toggle,
  .search-box {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    break-inside: avoid;
    box-shadow: none;
  }
}

/* 无障碍 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

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

/* 选中文本 */
::selection {
  background: var(--text-link);
  color: white;
}
```