```css

/* ===== 设计变量与基础重置 ===== */
:root {
  --bg-light: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #1F2937;
  --text-secondary: #334155;
  --text-heading: #111827;
  --text-footer: #E2E8F0;
  --brand-primary: #1f4d7a;
  --brand-dark: #0f2b44;
  --brand-light: #e6f0f9;
  --border-light: #cbd5e1;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
  --radius: 16px;
  --text-link: #1a4b7a;
  --ring: #0d2b44;
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.4);
  --gradient-banner: linear-gradient(145deg, var(--brand-dark), var(--brand-primary));
  --hover-translate: translateY(-4px);
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 暗黑模式变量 */
[data-theme="dark"] {
  --bg-light: #0b1622;
  --bg-card: #16202e;
  --text-primary: #E2E8F0;
  --text-secondary: #cbd5e1;
  --text-heading: #F8FAFC;
  --text-footer: #cbd5e1;
  --brand-primary: #2d6a9f;
  --brand-dark: #0a1a2b;
  --brand-light: #1b344b;
  --border-light: #2d4055;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.5);
  --text-link: #7ab3e5;
  --ring: #9ac2e0;
  --glass-bg: rgba(22, 32, 46, 0.6);
  --glass-border: rgba(45, 64, 85, 0.4);
  --gradient-banner: linear-gradient(145deg, #0a1a2b, #1b344b);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 文字层级颜色明确 */
h1, h2, h3, h4 {
  color: var(--text-heading);
  font-weight: 650;
  line-height: 1.3;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 1.9rem);
  margin: 1.8rem 0 0.8rem;
  border-left: 6px solid var(--brand-primary);
  padding-left: 0.9rem;
  position: relative;
}

h2::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 0;
  bottom: 0;
  width: 6px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--brand-primary), transparent);
}

h3 {
  font-size: clamp(1.2rem, 3vw, 1.4rem);
  margin: 1.5rem 0 0.6rem;
}

h4 {
  font-size: 1.15rem;
  margin: 1.2rem 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-primary);
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.3s;
}

a:hover {
  border-bottom-color: var(--text-link);
  color: var(--brand-primary);
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

/* 卡片、导航、按钮等对比度 */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.2rem;
}

/* ===== 导航 ===== */
.navbar {
  background-color: var(--glass-bg);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  box-shadow: var(--shadow-sm);
  padding: 0.8rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--glass-border);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

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

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.brand {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform var(--transition-fast);
}

.brand:hover {
  transform: scale(1.05);
}

.brand svg {
  width: 30px;
  height: 30px;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.nav-links {
  display: flex;
  gap: 1.6rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  border-bottom: none;
  padding: 0.35rem 0;
  position: relative;
  transition: color 0.3s ease;
}

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

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

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

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border: 1px solid var(--border-light);
  border-radius: 40px;
  padding: 0.2rem 0.6rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-box:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(31, 77, 122, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.5rem 0.6rem;
  color: var(--text-primary);
  outline: none;
  min-width: 140px;
  font-size: 0.95rem;
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.8;
}

.search-box button {
  background: var(--brand-primary);
  border: none;
  color: white;
  padding: 0.4rem 0.8rem;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

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

/* 主题切换按钮 */
.theme-toggle {
  background: var(--brand-light);
  border: 1px solid var(--border-light);
  border-radius: 30px;
  padding: 0.3rem 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1.1rem;
}

.theme-toggle:hover {
  transform: rotate(15deg) scale(1.1);
  box-shadow: var(--shadow-sm);
}

/* 移动菜单 */
.menu-check {
  display: none;
}

.menu-icon {
  display: none;
  font-size: 1.8rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: transform 0.3s ease;
}

.menu-icon:hover {
  transform: scale(1.2);
}

/* ===== Banner ===== */
.banner {
  background: var(--gradient-banner);
  color: white;
  padding: 3rem 0;
  border-radius: 0 0 40px 40px;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
  transition: background 0.5s ease;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: float 6s ease-in-out infinite;
}

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

.banner-content {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.banner-text {
  flex: 1 1 300px;
}

.banner-text h1 {
  color: white;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1.2;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  animation: fadeInUp 0.8s ease;
}

.banner-text p {
  color: #f0f7ff;
  font-size: clamp(1rem, 3vw, 1.2rem);
  margin-top: 1rem;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.banner-cta {
  background: white;
  color: var(--brand-dark);
  padding: 0.8rem 2rem;
  border-radius: 60px;
  font-weight: 700;
  display: inline-block;
  margin-top: 1.2rem;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  animation: fadeInUp 0.8s ease 0.4s both;
}

.banner-cta:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.banner svg {
  animation: fadeIn 1s ease 0.5s both;
}

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

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

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
  margin: 2rem 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-primary), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: var(--hover-translate);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-primary);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 0;
  transition: color 0.3s ease;
}

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

.card p {
  color: var(--text-primary);
}

/* ===== 文章卡片 ===== */
.article-item {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 14px;
  border-left: 4px solid var(--brand-primary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.2rem;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.article-item::after {
  content: '';
  position: absolute;
  right: -30px;
  top: -30px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--brand-light);
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

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

.article-item:hover::after {
  opacity: 1;
  transform: scale(1.5);
}

.article-item h3 {
  margin: 0 0 0.5rem;
  transition: color 0.3s ease;
}

.article-item:hover h3 {
  color: var(--brand-primary);
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-meta::before {
  content: '📅';
  font-size: 0.8rem;
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--bg-card);
  border-radius: 14px;
  padding: 1.2rem 1.5rem;
  border: 1px solid var(--border-light);
  margin-bottom: 1rem;
  transition: all 0.3s ease;
  cursor: pointer;
}

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

.faq-question {
  font-weight: 650;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.3s ease;
}

.faq-question span {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--brand-primary);
}

.faq-item:hover .faq-question {
  color: var(--brand-primary);
}

.faq-item.open .faq-question span {
  transform: rotate(180deg);
}

.faq-answer {
  color: var(--text-primary);
  margin-top: 0.8rem;
  display: none;
  animation: slideDown 0.3s ease;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-light);
}

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

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

/* ===== 表格 ===== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  color: var(--text-primary);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.info-table th, .info-table td {
  border: 1px solid var(--border-light);
  padding: 0.8rem 1rem;
  text-align: left;
  transition: background-color 0.3s ease;
}

.info-table th {
  background: var(--brand-light);
  color: var(--text-heading);
  font-weight: 650;
}

.info-table tr:hover td {
  background: var(--brand-light);
}

/* ===== Footer ===== */
.footer {
  background: #0f1b2a;
  color: var(--text-footer);
  padding: 3rem 0 1.5rem;
  margin-top: 3rem;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-primary), transparent);
}

.footer a {
  color: #bed9f0;
  transition: color 0.3s ease;
}

.footer a:hover {
  color: white;
  border-bottom-color: white;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
}

.footer h4 {
  color: #F8FAFC;
}

.footer p {
  color: #cbd5e1;
}

.footer-bottom {
  border-top: 1px solid #2a3a4a;
  padding-top: 1.5rem;
  margin-top: 2rem;
  font-size: 0.9rem;
  color: #a9c1d6;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.footer-bottom span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-bottom span::before {
  content: '🔒';
  font-size: 0.8rem;
}

/* ===== 数字动画 ===== */
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--brand-primary);
  transition: color 0.3s ease;
}

.stat-number:hover {
  color: var(--brand-dark);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s, transform 0.6s;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--brand-primary);
  color: white;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.8rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
}

.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--brand-dark);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

/* ===== 按钮 ===== */
.btn {
  background: var(--brand-primary);
  color: white;
  border: none;
  padding: 0.6rem 1.4rem;
  border-radius: 40px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-block;
}

.btn:hover {
  background: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===== 毛玻璃效果 ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
}

/* ===== 响应式 ===== */
@media (max-width: 800px) {
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 0;
    border-radius: 0 0 16px 16px;
    gap: 1rem;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    box-shadow: var(--shadow-md);
  }

  .menu-check:checked ~ .nav-links {
    display: flex;
    animation: slideDown 0.3s ease;
  }

  .menu-icon {
    display: block;
    cursor: pointer;
    z-index: 101;
  }

  .menu-check:checked ~ .menu-icon {
    color: var(--brand-primary);
  }

  .banner-content {
    flex-direction: column;
    text-align: center;
  }

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

  .banner svg {
    width: 180px;
    height: 150px;
  }

  .search-box {
    width: 100%;
    max-width: 300px;
  }

  .search-box input {
    flex: 1;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

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

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .brand {
    font-size: 1.5rem;
  }

  .brand svg {
    width: 24px;
    height: 24px;
  }

  .banner {
    padding: 2rem 0;
    border-radius: 0 0 30px 30px;
  }

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

  .banner-cta {
    padding: 0.6rem 1.5rem;
    font-size: 0.95rem;
  }

  .card {
    padding: 1.2rem;
  }

  .article-item {
    padding: 1.2rem;
  }

  .faq-item {
    padding: 1rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

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

:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
  border-radius: 4px;
}

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-dark);
}

/* ===== 图片文字对比度保证 ===== */
svg text {
  fill: currentColor;
}

/* ===== 链接下划线动画 ===== */
a {
  position: relative;
}

a:not(.btn):not(.banner-cta):not(.nav-links a):not(.footer a)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width 0.3s ease;
}

a:not(.btn):not(.banner-cta):not(.nav-links a):not(.footer a):hover::after {
  width: 100%;
}

/* ===== 内容选择样式 ===== */
::selection {
  background: var(--brand-primary);
  color: white;
}

/* ===== 打印样式 ===== */
@media print {
  .navbar, .banner, .back-to-top, .theme-toggle, .footer {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card, .article-item, .faq-item {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

```