```css
/* ===== 颜色系统 (高对比度版本) ===== */
:root {
  --bg-main: #ffffff;
  --bg-soft: #f5f7fa;
  --bg-card: #ffffff;
  --bg-footer: #1f2937;
  --bg-nav: rgba(255, 255, 255, 0.96);
  --text-primary: #1f2937;
  --text-secondary: #2d3c4e;
  --text-heading: #0b1a2a;
  --text-link: #1e4b7a;
  --text-on-dark: #f1f5f9;
  --text-muted-on-dark: #cbd5e1;
  --border-light: #d1d9e6;
  --accent: #1a5276;
  --accent-bright: #2980b9;
  --btn-text: #ffffff;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.08);
  --gradient-hero: linear-gradient(145deg, #e8f0fe 0%, #f8fafc 50%, #e0f2fe 100%);
  --gradient-card: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  --glass-effect: blur(12px) saturate(180%);
  --border-glass: rgba(255, 255, 255, 0.4);
  --scrollbar-thumb: #cbd5e1;
  --scrollbar-track: #f1f5f9;
}

/* 暗黑模式变量 */
[data-theme="dark"] {
  --bg-main: #12181f;
  --bg-soft: #1c2530;
  --bg-card: #1e293b;
  --bg-footer: #0f172a;
  --bg-nav: rgba(18, 24, 31, 0.96);
  --text-primary: #e2e8f0;
  --text-secondary: #cbd5e1;
  --text-heading: #ffffff;
  --text-link: #7cb8e8;
  --text-on-dark: #f1f5f9;
  --text-muted-on-dark: #cbd5e1;
  --border-light: #334155;
  --accent: #3b82c4;
  --accent-bright: #60a5fa;
  --btn-text: #ffffff;
  --gradient-hero: linear-gradient(145deg, #1a2634 0%, #1c2530 50%, #1e293b 100%);
  --gradient-card: linear-gradient(135deg, #1e293b 0%, #1c2530 100%);
  --border-glass: rgba(255, 255, 255, 0.08);
  --scrollbar-thumb: #334155;
  --scrollbar-track: #12181f;
}

/* ===== 基础重置与排版 ===== */
* {
  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, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.75;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 10px;
  border: 2px solid var(--scrollbar-track);
}

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

h1, h2, h3, h4 {
  color: var(--text-heading);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

h1 {
  font-size: 2.2rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.9rem;
  border-left: 6px solid var(--accent);
  padding-left: 1rem;
  margin-top: 2.5rem;
  position: relative;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.5rem;
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

h3 {
  font-size: 1.4rem;
  margin-top: 1.8rem;
}

h4 {
  font-size: 1.15rem;
  margin-top: 1.2rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

a {
  color: var(--text-link);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  margin-left: 1.8rem;
  margin-bottom: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 4rem 0;
}

/* 文本选择样式 */
::selection {
  background: var(--accent);
  color: var(--btn-text);
}

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-nav);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  border-bottom: 1px solid var(--border-light);
  transition: background 0.3s, box-shadow 0.3s;
}

.navbar:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
}

.brand {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease;
}

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

.brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  padding: 0.3rem 0;
}

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

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

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

.search-box {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-soft);
  padding: 0.4rem 0.8rem;
  border-radius: 30px;
  border: 1px solid var(--border-light);
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 82, 118, 0.1);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.3rem 0.6rem;
  color: var(--text-primary);
  width: 160px;
  outline: none;
  font-size: 0.9rem;
}

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

.search-box button {
  background: var(--accent);
  border: none;
  border-radius: 30px;
  padding: 0.3rem 1rem;
  color: var(--btn-text);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.search-box button:hover {
  background: var(--accent-bright);
  transform: scale(1.02);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.3rem;
  border-radius: 8px;
  transition: background 0.2s ease;
}

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

.theme-toggle {
  background: var(--bg-soft);
  border: none;
  border-radius: 30px;
  padding: 0.4rem 0.9rem;
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--accent);
  color: var(--btn-text);
  border-color: var(--accent);
}

/* 移动菜单 */
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0.8rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.mobile-menu a {
  color: var(--text-primary);
  font-size: 1.1rem;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  transition: background 0.2s ease, color 0.2s ease;
}

.mobile-menu a:hover {
  background: var(--bg-soft);
  color: var(--accent);
  text-decoration: none;
}

/* ===== Hero Banner ===== */
.hero {
  background: var(--gradient-hero);
  border-radius: 2rem;
  padding: 3rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-glass);
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(26, 82, 118, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(41, 128, 185, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

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

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

.hero-text h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-heading) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.btn {
  background: var(--accent);
  color: var(--btn-text);
  padding: 0.7rem 2rem;
  border-radius: 40px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-block;
  font-size: 1rem;
  box-shadow: 0 4px 12px rgba(26, 82, 118, 0.2);
}

.btn:hover {
  background: var(--accent-bright);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 82, 118, 0.3);
  text-decoration: none;
}

.btn:active {
  transform: translateY(0);
}

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

.btn-outline:hover {
  background: var(--accent);
  color: var(--btn-text);
  box-shadow: 0 4px 12px rgba(26, 82, 118, 0.2);
}

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

.card {
  background: var(--gradient-card);
  border: 1px solid var(--border-light);
  border-radius: 1.5rem;
  padding: 1.8rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

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

.card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 文章列表 ===== */
.article-list {
  list-style: none;
  margin-left: 0;
}

.article-list li {
  border-bottom: 1px solid var(--border-light);
  padding: 1.2rem 0;
  transition: padding-left 0.3s ease, background 0.3s ease;
  border-radius: 8px;
  padding-left: 0.5rem;
}

.article-list li:hover {
  padding-left: 1.2rem;
  background: var(--bg-soft);
}

.article-list a {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-heading);
  transition: color 0.2s ease;
}

.article-list a:hover {
  color: var(--accent);
}

.article-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-meta::before {
  content: "📅";
  font-size: 0.85rem;
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 1rem 0;
  transition: background 0.2s ease;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-heading);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem;
  border-radius: 8px;
  transition: background 0.2s ease, color 0.2s ease;
}

.faq-question:hover {
  background: var(--bg-soft);
  color: var(--accent);
}

.faq-question span {
  font-size: 1.3rem;
  font-weight: 300;
  transition: transform 0.3s ease;
  color: var(--accent);
}

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

.faq-answer {
  margin-top: 0.8rem;
  color: var(--text-primary);
  padding: 0 0.8rem 0.8rem;
  line-height: 1.7;
  border-left: 3px solid var(--accent);
  margin-left: 0.8rem;
}

/* ===== 表格 ===== */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

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

.info-table tr {
  transition: background 0.2s ease;
}

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

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-footer);
  color: var(--text-on-dark);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
  position: relative;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright), var(--accent));
}

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

.footer h4 {
  color: var(--text-on-dark);
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.footer p {
  color: var(--text-muted-on-dark);
  margin-bottom: 0.5rem;
}

.footer a {
  color: var(--text-muted-on-dark);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid #334155;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  text-align: center;
  color: var(--text-muted-on-dark);
}

.footer-bottom p {
  margin-bottom: 0.3rem;
  font-size: 0.9rem;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  padding: 0.8rem 1rem;
  background: var(--bg-soft);
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.breadcrumb a {
  color: var(--text-link);
  transition: color 0.2s ease;
}

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

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

/* ===== 图片占位SVG ===== */
.svg-placeholder {
  background: var(--bg-soft);
  border-radius: 1rem;
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.svg-placeholder:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

/* ===== 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);
}

/* ===== 解决方案区域 ===== */
.solutions-section {
  background: var(--bg-soft);
  border-radius: 2rem;
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}

.solutions-section::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(26, 82, 118, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.8rem;
  margin-top: 1.5rem;
}

.solutions-grid > div {
  background: var(--bg-card);
  border-radius: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--border-light);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.solutions-grid > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.solutions-grid h4 {
  color: var(--accent);
  margin-bottom: 0.8rem;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.solutions-grid h4::before {
  content: "✦";
  font-size: 1.2rem;
}

.solutions-grid p {
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

/* ===== 友情链接区域 ===== */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.friend-links a {
  padding: 0.5rem 1.2rem;
  background: var(--bg-soft);
  border-radius: 30px;
  border: 1px solid var(--border-light);
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

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

/* ===== 联系信息卡片 ===== */
.contact-grid {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.contact-grid .card {
  text-align: center;
  padding: 1.5rem;
}

.contact-grid .card strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-heading);
  font-size: 1.1rem;
}

.contact-grid .card br {
  display: none;
}

/* ===== 返回顶部按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 12px 20px;
  border-radius: 40px;
  background: var(--accent);
  color: var(--btn-text);
  border: none;
  font-weight: bold;
  cursor: pointer;
  z-index: 999;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.back-to-top:hover {
  background: var(--accent-bright);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.back-to-top::before {
  content: "↑";
  font-size: 1.2rem;
}

/* ===== 分隔线 ===== */
.divider {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 2rem 0;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-text h1 {
    font-size: 2.4rem;
  }

  .nav-links {
    gap: 1.2rem;
  }

  .search-box input {
    width: 120px;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .search-box {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .mobile-menu.active {
    display: flex;
  }

  .hero {
    padding: 2rem;
    border-radius: 1.5rem;
  }

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

  .hero-text p {
    font-size: 1.05rem;
  }

  .hero-cta {
    flex-direction: column;
    gap: 0.8rem;
  }

  .hero-cta .btn {
    width: 100%;
    text-align: center;
  }

  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.2rem;
  }

  .card {
    padding: 1.2rem;
  }

  .section-padding {
    padding: 2.5rem 0;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }

  .footer-bottom {
    font-size: 0.85rem;
  }

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

  .solutions-section {
    padding: 1.5rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    padding: 10px 16px;
  }

  .breadcrumb {
    font-size: 0.85rem;
    padding: 0.6rem 0.8rem;
  }

  .article-list a {
    font-size: 1.05rem;
  }

  .faq-question {
    font-size: 1rem;
    padding: 0.6rem;
  }

  .faq-answer {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.6rem;
  }

  .hero {
    padding: 1.5rem;
  }

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

  .brand {
    font-size: 1.5rem;
  }

  .theme-toggle {
    padding: 0.3rem 0.6rem;
    font-size: 0.85rem;
  }

  .menu-toggle {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 0.8rem;
  }

  .back-to-top {
    padding: 8px 14px;
    font-size: 0.85rem;
  }

  .friend-links {
    gap: 0.8rem;
  }

  .friend-links a {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
  }
}

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

  body {
    background: white;
    color: black;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}

/* ===== 无障碍访问 ===== */
@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;
  }

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

/* 焦点可见性 */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (forced-colors: active) {
  .btn,
  .theme-toggle,
  .search-box button {
    border: 2px solid ButtonText;
  }
}
```