```css
:root {
  --bg-light: #f8fafc;
  --bg-dark: #0b1320;
  --text-light: #1f2937;
  --text-dark: #e2e8f0;
  --primary: #1e3a5f;
  --primary-light: #2d4a74;
  --accent: #b8860b;
  --card-bg-light: #ffffff;
  --card-bg-dark: #16202e;
  --border-light: #d1d9e6;
  --border-dark: #2d3f54;
  --footer-bg-light: #1e2a3a;
  --footer-text-light: #e2e8f0;
  --footer-bg-dark: #0a0f18;
  --footer-text-dark: #cbd5e1;
  --nav-bg-light: rgba(255, 255, 255, 0.85);
  --nav-bg-dark: rgba(10, 18, 28, 0.9);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --vp-xxxlarge: 56px;
  --vp-xxlarge: 48px;
  --vp-xlarge: 40px;
  --vp-large: 32px;
  --vp-medium: 24px;
  --vp-small: 16px;
  --vp-xsmall: 8px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg-light);
  color: var(--text-light);
  line-height: 1.7;
  transition: background-color 0.2s, color 0.2s;
  overflow-x: hidden;
}

body.dark-mode {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

h1, h2, h3, h4 {
  color: #0b1c2e;
  font-weight: 700;
  line-height: 1.3;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4 {
  color: #f8fafc;
}

h1 { font-size: 2.2rem; }
h2 { font-size: 1.8rem; margin-top: 1.5rem; margin-bottom: 1rem; border-left: 4px solid var(--primary); padding-left: 0.8rem; }
h3 { font-size: 1.4rem; margin-top: 1.2rem; }
h4 { font-size: 1.2rem; }

p {
  color: var(--text-light);
  margin-bottom: 1rem;
}

body.dark-mode p {
  color: var(--text-dark);
}

a {
  color: #1d4ed8;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

body.dark-mode a {
  color: #93c5fd;
}

a:hover {
  text-decoration: underline;
  color: #1e40af;
}

body.dark-mode a:hover {
  color: #bfdbfe;
}

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

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg-light);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  transition: background 0.2s, border-color 0.2s;
}

body.dark-mode .navbar {
  background: var(--nav-bg-dark);
  border-bottom-color: var(--border-dark);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1rem;
  gap: 0.5rem;
}

.logo a {
  font-size: 1.8rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: 1px;
}

body.dark-mode .logo a {
  color: #f1f5f9;
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  color: #1f2937;
  position: relative;
  transition: color 0.2s;
}

body.dark-mode .nav-links a {
  color: #e2e8f0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s;
}

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

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.search-box {
  display: flex;
  align-items: center;
  background: #eef2f6;
  border-radius: 30px;
  padding: 0.2rem 0.8rem;
  transition: box-shadow 0.2s;
}

body.dark-mode .search-box {
  background: #1e293b;
}

.search-box:focus-within {
  box-shadow: 0 0 0 2px rgba(30, 58, 95, 0.3);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.5rem 0.3rem;
  color: #1e293b;
  outline: none;
  width: 140px;
  font-size: 0.95rem;
}

body.dark-mode .search-box input {
  color: #e2e8f0;
}

.search-box input::placeholder {
  color: #94a3b8;
}

body.dark-mode .search-box input::placeholder {
  color: #64748b;
}

.search-box button {
  background: transparent;
  border: none;
  cursor: pointer;
  color: #334155;
  font-size: 1rem;
  transition: transform 0.2s;
}

body.dark-mode .search-box button {
  color: #cbd5e1;
}

.search-box button:hover {
  transform: scale(1.1);
}

.theme-toggle,
.menu-toggle {
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 0.3rem 0.8rem;
  cursor: pointer;
  color: #1e293b;
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.2s;
}

body.dark-mode .theme-toggle,
body.dark-mode .menu-toggle {
  border-color: var(--border-dark);
  color: #e2e8f0;
}

.theme-toggle:hover,
.menu-toggle:hover {
  background: rgba(0, 0, 0, 0.05);
  transform: translateY(-2px);
}

body.dark-mode .theme-toggle:hover,
body.dark-mode .menu-toggle:hover {
  background: rgba(255, 255, 255, 0.05);
}

.menu-toggle {
  display: none;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1rem;
  background: var(--card-bg-light);
  border-radius: var(--radius);
  margin: 0.5rem 1rem;
  box-shadow: var(--shadow);
}

body.dark-mode .mobile-menu {
  background: var(--card-bg-dark);
}

.mobile-menu a {
  color: var(--text-light);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: background 0.2s;
}

body.dark-mode .mobile-menu a {
  color: var(--text-dark);
}

.mobile-menu a:hover {
  background: rgba(0, 0, 0, 0.05);
  text-decoration: none;
  color: var(--accent);
}

body.dark-mode .mobile-menu a:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e3a5f, #1a2b4a, #2d4a74, #1e3a5f);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  border-radius: var(--radius);
  margin: 1.5rem 0;
  padding: 2.5rem 2rem;
  color: white;
  position: relative;
  overflow: hidden;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(184, 134, 11, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(10deg); }
}

body.dark-mode .hero {
  background: linear-gradient(145deg, #0f1b2e, #17293d, #1f3a57, #0f1b2e);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

.hero h1 {
  color: #ffffff;
  font-size: 2.5rem;
  margin-bottom: 0.8rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 0.8s ease;
}

.hero p {
  color: #e2e8f0;
  font-size: 1.2rem;
  max-width: 70%;
  animation: fadeInUp 0.8s ease 0.2s both;
}

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

.hero .btn-group {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
  background-color: #ffffff;
  color: #1e3a5f;
  padding: 0.7rem 1.8rem;
  border-radius: 40px;
  font-weight: 700;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  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, 0.3), transparent);
  transition: left 0.5s;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

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

.btn-outline {
  background: transparent;
  border: 2px solid #ffffff;
  color: white;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* 卡片 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.8rem;
  margin: 2rem 0;
}

.card {
  background: var(--card-bg-light);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  padding: 1.5rem;
  transition: all 0.3s;
  box-shadow: var(--shadow);
  cursor: default;
}

body.dark-mode .card {
  background: var(--card-bg-dark);
  border-color: var(--border-dark);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
  border-color: var(--primary);
}

body.dark-mode .card:hover {
  border-color: var(--primary-light);
}

.card h3 {
  color: #0b1c2e;
  margin-bottom: 0.5rem;
  transition: color 0.2s;
}

body.dark-mode .card h3 {
  color: #f8fafc;
}

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

.card p {
  color: #334155;
  font-size: 0.95rem;
}

body.dark-mode .card p {
  color: #cbd5e1;
}

.card a {
  color: #1d4ed8;
}

body.dark-mode .card a {
  color: #93c5fd;
}

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

.article-list li {
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--border-light);
  transition: padding-left 0.3s;
}

body.dark-mode .article-list li {
  border-bottom-color: var(--border-dark);
}

.article-list li:hover {
  padding-left: 0.5rem;
}

.article-list h4 a {
  color: #0b1c2e;
  transition: all 0.2s;
}

body.dark-mode .article-list h4 a {
  color: #e2e8f0;
}

.article-list h4 a:hover {
  color: var(--accent);
  text-decoration: none;
}

.article-meta {
  font-size: 0.9rem;
  color: #475569;
  margin: 0.3rem 0;
}

body.dark-mode .article-meta {
  color: #94a3b8;
}

/* FAQ */
.faq-item {
  margin-bottom: 1rem;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s;
}

body.dark-mode .faq-item {
  border-color: var(--border-dark);
}

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

.faq-question {
  background: #eef2f6;
  padding: 0.8rem 1.2rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #0f172a;
  user-select: none;
  transition: background 0.2s;
}

body.dark-mode .faq-question {
  background: #1e293b;
  color: #f1f5f9;
}

.faq-question span {
  font-size: 1.5rem;
  font-weight: 300;
  transition: transform 0.3s;
}

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

.faq-question:hover {
  background: #e2e8f0;
}

body.dark-mode .faq-question:hover {
  background: #2d3748;
}

.faq-answer {
  padding: 0 1.2rem 1rem;
  background: var(--card-bg-light);
  color: #1f2937;
  display: none;
  animation: fadeIn 0.3s ease;
}

body.dark-mode .faq-answer {
  background: var(--card-bg-dark);
  color: #e2e8f0;
}

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

.faq-answer p {
  color: #1e293b;
  padding-top: 0.8rem;
}

body.dark-mode .faq-answer p {
  color: #d1d5db;
}

/* HowTo */
.howto-box {
  background: #f1f5f9;
  border-radius: var(--radius);
  padding: 1.8rem;
  margin: 2rem 0;
  border-left: 4px solid var(--accent);
}

body.dark-mode .howto-box {
  background: #1e293b;
}

.howto-box ol {
  margin-left: 1.5rem;
}

.howto-box li {
  margin: 0.8rem 0;
  color: inherit;
}

/* 表格 */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.info-table th {
  background: #1e3a5f;
  color: white;
  padding: 0.8rem;
  text-align: left;
}

body.dark-mode .info-table th {
  background: #1f3a57;
}

.info-table td {
  border: 1px solid var(--border-light);
  padding: 0.8rem;
  color: #1f2937;
}

body.dark-mode .info-table td {
  border-color: var(--border-dark);
  color: #e2e8f0;
}

/* footer */
.footer {
  background-color: var(--footer-bg-light);
  color: var(--footer-text-light);
  padding: 2.5rem 0 1rem;
  margin-top: 3rem;
  position: relative;
}

body.dark-mode .footer {
  background-color: var(--footer-bg-dark);
  color: var(--footer-text-dark);
}

.footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.footer h4 {
  color: #ffffff;
  margin-bottom: 1rem;
  border-left: none;
  padding-left: 0;
}

body.dark-mode .footer h4 {
  color: #f8fafc;
}

.footer a {
  color: #cbd5e1;
  transition: color 0.2s;
}

body.dark-mode .footer a {
  color: #9ca3af;
}

.footer a:hover {
  color: #ffffff;
  text-decoration: none;
}

body.dark-mode .footer a:hover {
  color: #f1f5f9;
}

.footer-bottom {
  border-top: 1px solid #2d3f54;
  margin-top: 2rem;
  padding-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
  color: #94a3b8;
}

/* 面包屑 */
.breadcrumb {
  font-size: 0.9rem;
  padding: 1rem 0;
  color: #475569;
}

body.dark-mode .breadcrumb {
  color: #94a3b8;
}

.breadcrumb a {
  color: #1e40af;
}

body.dark-mode .breadcrumb a {
  color: #93c5fd;
}

/* 通用 */
.section-title {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.svg-placeholder {
  background: #e2e8f0;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #334155;
  min-height: 120px;
  transition: transform 0.3s;
}

body.dark-mode .svg-placeholder {
  background: #1e293b;
  color: #cbd5e1;
}

.svg-placeholder:hover {
  transform: scale(1.02);
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  background: var(--card-bg-light);
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
}

body.dark-mode .contact-row {
  background: var(--card-bg-dark);
  border-color: var(--border-dark);
}

.back-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #1e3a5f;
  color: white;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: none;
  opacity: 0.8;
  transition: all 0.3s;
  z-index: 999;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

body.dark-mode .back-top {
  background: #2d4a74;
}

.back-top:hover {
  opacity: 1;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* 滚动动画 */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式 */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .menu-toggle { display: inline-block; }
  .mobile-menu.show { display: flex; }
  .search-box { display: none; }
}

@media (max-width: 600px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  .hero { padding: 2rem 1.5rem; }
  .hero p { max-width: 100%; font-size: 1.1rem; }
  .hero h1 { font-size: 2rem; }
  .card-grid { grid-template-columns: 1fr; }
  .back-top { bottom: 1rem; right: 1rem; width: 40px; height: 40px; font-size: 1rem; }
  .footer .container { grid-template-columns: 1fr; }
  .contact-row { padding: 1rem; }
}

@media (min-width: 601px) and (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .hero p { max-width: 85%; }
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}

/* 暗色模式滚动条 */
body.dark-mode ::-webkit-scrollbar-thumb {
  background: #4a5568;
}

/* 选择文本 */
::selection {
  background-color: var(--accent);
  color: white;
}

/* 焦点可见性 */
:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* 减少动画偏好 */
@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;
  }
}

/* 打印样式 */
@media print {
  .navbar, .back-top, .search-box, .theme-toggle, .menu-toggle, .mobile-menu, .btn-group {
    display: none !important;
  }
  body {
    background: white;
    color: black;
  }
  .hero {
    background: #f0f0f0;
    color: black;
  }
  .hero h1, .hero p {
    color: black;
  }
}
```