```css
/* ===== 全局样式与CSS变量 ===== */
:root {
  --primary: #1a3a5c;
  --primary-dark: #0f2a42;
  --primary-light: #2a5f8f;
  --accent: #e50914;
  --accent-hover: #b2070f;
  --bg: #f0f2f5;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --bg-footer: #1a2634;
  --text-main: #1f2937;
  --text-heading: #0b1a2a;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --blur-bg: rgba(255, 255, 255, 0.6);
  --blur-border: rgba(255, 255, 255, 0.3);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

/* 暗色模式变量 */
[data-theme="dark"],
body.dark {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-nav: rgba(15, 23, 42, 0.85);
  --bg-footer: #0b121c;
  --text-main: #e2e8f0;
  --text-heading: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --border-light: #273548;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --blur-bg: rgba(15, 23, 42, 0.7);
  --blur-border: rgba(51, 65, 85, 0.4);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  transition: background 0.4s ease, color 0.3s ease;
  overflow-x: hidden;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--primary-light);
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea {
  font-family: inherit;
}

/* ===== 排版 ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  margin-bottom: 1.5rem;
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary-light));
  border-radius: 4px;
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

h4 {
  font-size: 1.1rem;
}

p {
  color: var(--text-main);
}

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

.text-muted {
  color: var(--text-muted);
}

/* ===== 容器 ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px);
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: 12px 0;
  transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.navbar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-heading);
  white-space: nowrap;
}

.navbar .brand svg {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  padding: 6px;
  box-shadow: 0 4px 12px rgba(26, 58, 92, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

.nav-links a {
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
  transition: color 0.2s;
}

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

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

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

/* 汉堡菜单 - 移动端 */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1100;
}

.burger span {
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: 0.3s;
}

.burger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger.active span:nth-child(2) {
  opacity: 0;
}

.burger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
  padding: 80px 24px 24px;
  transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1050;
  overflow-y: auto;
}

.mobile-menu.open {
  right: 0;
}

.mobile-menu a {
  display: block;
  padding: 12px 8px;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-light);
}

.mobile-menu a:hover {
  color: var(--accent);
  padding-left: 16px;
}

/* ===== 按钮 ===== */
.btn-primary,
.btn-outline,
.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff !important;
  box-shadow: 0 4px 20px rgba(26, 58, 92, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(26, 58, 92, 0.4);
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary) !important;
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff !important;
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #ff4d4d);
  color: #fff !important;
  box-shadow: 0 4px 20px rgba(229, 9, 20, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(229, 9, 20, 0.4);
}

/* ===== 徽章 ===== */
.badge {
  display: inline-block;
  background: linear-gradient(135deg, #e6f0ff, #d4e4ff);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

[data-theme="dark"] .badge,
body.dark .badge {
  background: rgba(26, 58, 92, 0.4);
  color: #a0c6ff;
}

/* ===== Banner ===== */
.banner {
  position: relative;
  background: linear-gradient(135deg, #0b1f33 0%, #14344d 50%, #1a3a5c 100%);
  padding: clamp(60px, 10vw, 120px) 0;
  overflow: hidden;
  border-radius: 0 0 clamp(24px, 4vw, 48px) clamp(24px, 4vw, 48px);
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
  animation: float 12s ease-in-out infinite reverse;
}

.banner .container {
  position: relative;
  z-index: 2;
}

.banner h1 {
  color: #fff;
  max-width: 800px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  animation: fadeSlideUp 0.8s ease both;
}

.banner p {
  color: rgba(255, 255, 255, 0.85);
  font-size: clamp(1rem, 2vw, 1.3rem);
  margin: 24px 0 32px;
  max-width: 650px;
  animation: fadeSlideUp 0.8s ease 0.1s both;
}

.banner .btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeSlideUp 0.8s ease 0.2s both;
}

.banner .btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: #fff !important;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.banner .btn-outline:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #fff;
}

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

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

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

.card h3,
.card h4 {
  margin-bottom: 8px;
}

.card p:last-child {
  margin-bottom: 0;
}

/* ===== 文章卡片 ===== */
.article-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--border-light);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-md);
}

.article-card h3 {
  font-size: 1.15rem;
  line-height: 1.4;
}

.article-card .date {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  flex-grow: 1;
}

.article-card a {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
}

.article-card a:hover {
  gap: 8px;
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 12px;
  transition: all 0.3s ease;
  cursor: pointer;
}

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

.faq-question {
  font-weight: 600;
  color: var(--text-heading);
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  color: var(--text-secondary);
  margin-top: 12px;
  line-height: 1.6;
  display: none;
  animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 表格 ===== */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  min-width: 600px;
}

.table th {
  background: var(--bg);
  color: var(--text-heading);
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
}

.table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-main);
}

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

.table tr:hover td {
  background: var(--bg);
}

/* ===== 分割线 ===== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  border: none;
  margin: 24px 0;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-footer) !important;
  color: #e2e8f0;
  padding: clamp(40px, 6vw, 60px) 0 24px;
  margin-top: 60px;
  position: relative;
}

.footer h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 8px;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.footer ul li {
  margin-bottom: 8px;
}

.footer a {
  color: #a0aec0;
  transition: color 0.3s, padding-left 0.3s;
  font-weight: 400;
}

.footer a:hover {
  color: #fff;
  padding-left: 6px;
}

.footer .copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  margin-top: 32px;
  text-align: center;
  color: #718096;
  font-size: 0.9rem;
}

.footer .copyright a {
  color: #a0aec0;
}

.footer .copyright a:hover {
  color: #fff;
}

/* ===== 返回顶部 ===== */
#backTop {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
}

#backTop:hover {
  background: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

/* ===== 搜索框 ===== */
.search-wrapper {
  position: relative;
  max-width: 400px;
}

.search-wrapper input {
  width: 100%;
  padding: 12px 48px 12px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.search-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.15);
}

.search-wrapper .search-icon {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ===== 网格布局 ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ===== 图标背景 ===== */
.icon-bg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  margin-bottom: 16px;
  box-shadow: 0 4px 12px rgba(26, 58, 92, 0.2);
}

/* ===== 标签云 ===== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud a {
  padding: 4px 14px;
  background: var(--bg);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.tag-cloud a:hover {
  background: var(--primary);
  color: #fff;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }
  
  .burger {
    display: flex;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  
  .container {
    padding: 0 16px;
  }
  
  h1 {
    font-size: 1.8rem;
  }
  
  h2 {
    font-size: 1.4rem;
  }
  
  .banner {
    padding: 48px 0;
  }
  
  .banner p {
    font-size: 1rem;
  }
  
  .btn-primary,
  .btn-outline,
  .btn-accent {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
  
  .card {
    padding: 18px;
  }
  
  .footer {
    padding: 32px 0 16px;
  }
  
  .footer .grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  #backTop {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 12px;
  }
  
  .navbar .brand {
    font-size: 1.2rem;
  }
  
  .banner h1 {
    font-size: 1.5rem;
  }
  
  .banner .btn-group {
    flex-direction: column;
    width: 100%;
  }
  
  .banner .btn-group .btn-primary,
  .banner .btn-group .btn-outline {
    width: 100%;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .faq-item {
    padding: 16px;
  }
  
  .faq-question {
    font-size: 1rem;
  }
}

/* ===== 暗色模式适配 ===== */
body.dark .navbar {
  background: var(--bg-nav);
  border-bottom-color: var(--border);
}

body.dark .card,
body.dark .article-card,
body.dark .faq-item,
body.dark .table {
  background: var(--bg-card);
  border-color: var(--border);
}

body.dark .table th {
  background: var(--bg);
  color: var(--text-heading);
}

body.dark .table td {
  border-bottom-color: var(--border);
}

body.dark .icon-bg {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

/* ===== 打印样式 ===== */
@media print {
  .navbar,
  .footer,
  #backTop,
  .burger,
  .mobile-menu {
    display: none !important;
  }
  
  body {
    background: #fff;
    color: #000;
  }
  
  .card,
  .article-card,
  .faq-item {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}

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

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

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

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

/* ===== 选中文本样式 ===== */
::selection {
  background: var(--primary);
  color: #fff;
}

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