```css
:root {
  --bg-light: #F8F9FC;
  --bg-dark: #12181F;
  --text-primary-light: #1F2937;
  --text-secondary-light: #2D3B4F;
  --text-heading-light: #0B1E33;
  --text-link-light: #1A4B8C;
  --text-white: #FFFFFF;
  --bg-card-light: #FFFFFF;
  --bg-card-dark: #1F2937;
  --border-light: #D1D9E6;
  --border-dark: #334155;
  --accent: #C44536;
  --accent-dark: #A9937B;
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(255,255,255,0.3);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f0f4ff 100%);
  --gradient-accent: linear-gradient(90deg, #C44536, #E2A38B);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-display: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --bg-light: #12181F;
  --bg-dark: #0B0F14;
  --text-primary-light: #E2E8F0;
  --text-secondary-light: #CBD5E1;
  --text-heading-light: #F8FAFC;
  --text-link-light: #8AB4F8;
  --text-white: #F1F5F9;
  --bg-card-light: #1E293B;
  --bg-card-dark: #0F172A;
  --border-light: #334155;
  --border-dark: #475569;
  --accent: #E2A38B;
  --accent-dark: #B7A9A1;
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255,255,255,0.1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.6);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  --gradient-card: linear-gradient(145deg, #1E293B 0%, #0F172A 100%);
  --gradient-accent: linear-gradient(90deg, #E2A38B, #B7A9A1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-display);
  background-color: var(--bg-light);
  color: var(--text-primary-light);
  line-height: 1.7;
  transition: var(--transition);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  position: relative;
  padding-bottom: 0.5rem;
  margin-bottom: 2rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

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

a {
  color: var(--text-link-light);
  text-decoration: none;
  transition: var(--transition);
  position: relative;
}

a:hover {
  opacity: 0.85;
  color: var(--accent);
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.nav {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 0.8rem 0;
  transition: var(--transition);
  box-shadow: 0 4px 30px rgba(0,0,0,0.1);
}

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

.nav-links {
  display: flex;
  gap: 0.5rem;
}

.nav-links a {
  color: var(--text-heading-light);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: var(--transition);
  border-radius: var(--radius-full);
}

.nav-links a:hover::after {
  width: 60%;
}

.nav-links a:hover {
  background: rgba(196, 69, 54, 0.1);
  color: var(--accent);
}

.search-box {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-full);
  color: var(--text-primary-light);
  font-size: 0.9rem;
  width: 180px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.search-box:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(196, 69, 54, 0.2);
  width: 220px;
}

.search-box::placeholder {
  color: var(--text-secondary-light);
}

#theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 0.5rem 1.2rem;
  color: var(--text-heading-light);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

#theme-toggle:hover {
  border-color: var(--accent);
  background: rgba(196, 69, 54, 0.1);
  transform: translateY(-2px);
}

/* Hero 区域 */
#home > section:first-of-type {
  background: var(--gradient-hero);
  border-radius: var(--radius-lg);
  margin: 2rem 0;
  padding: 4rem 2rem !important;
  position: relative;
  overflow: hidden;
}

#home > section:first-of-type::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%);
  animation: float 6s ease-in-out infinite;
}

#home > section:first-of-type::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 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); }
}

#home > section:first-of-type h1 {
  color: #fff;
  -webkit-text-fill-color: #fff;
  position: relative;
  z-index: 1;
}

#home > section:first-of-type p {
  color: rgba(255,255,255,0.9);
  position: relative;
  z-index: 1;
}

/* 卡片 */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(196, 69, 54, 0.3);
}

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

[data-theme="dark"] .card {
  background: var(--gradient-card);
  border-color: var(--border-dark);
}

/* 按钮 */
.btn {
  background: var(--gradient-accent);
  color: #fff !important;
  font-weight: 600;
  padding: 0.8rem 2rem;
  border-radius: var(--radius-full);
  border: none;
  display: inline-block;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(196, 69, 54, 0.3);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(196, 69, 54, 0.4);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

/* 网格布局 */
.grid-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

/* 标签 */
.tag {
  background: var(--gradient-accent);
  color: #fff;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-block;
  transition: var(--transition);
}

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

/* FAQ 样式 */
.faq-item {
  border-bottom: 1px solid var(--border-light);
  padding: 1.25rem 0;
  transition: var(--transition);
}

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

.faq-question {
  font-weight: 600;
  color: var(--text-heading-light);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent);
  transition: var(--transition);
}

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

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

.faq-answer {
  margin-top: 0.75rem;
  color: var(--text-secondary-light);
  display: none;
  animation: fadeIn 0.3s ease;
}

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

/* 表格 */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--glass-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table th {
  background: var(--gradient-accent);
  color: #fff;
  padding: 1rem;
  font-weight: 600;
  text-align: left;
}

.table td {
  border-bottom: 1px solid var(--border-light);
  padding: 1rem;
  transition: var(--transition);
}

.table tr:hover td {
  background: rgba(196, 69, 54, 0.05);
}

/* 滚动动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 占位图 */
.svg-placeholder {
  background: linear-gradient(135deg, #E0E7F0, #F0F4FF);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  min-height: 180px;
  color: #1E3A5F;
  font-weight: 600;
  border: 2px dashed var(--border-light);
  transition: var(--transition);
}

.svg-placeholder:hover {
  border-color: var(--accent);
  transform: scale(1.02);
}

[data-theme="dark"] .svg-placeholder {
  background: linear-gradient(135deg, #2D3B4F, #1E293B);
  color: #E2E8F0;
  border-color: var(--border-dark);
}

/* Footer */
.footer {
  background: linear-gradient(135deg, #0B1E33, #1A2B4C);
  color: #E2E8F0;
  padding: 3rem 0;
  margin-top: 4rem;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
}

.footer a {
  color: #CDE0FF;
  transition: var(--transition);
}

.footer a:hover {
  color: var(--accent);
  transform: translateX(5px);
}

.footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.footer .container > div {
  flex: 1;
  min-width: 250px;
}

.footer .container > div:first-child {
  flex: 2;
}

.copyright {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 1rem;
}

/* 返回顶部 */
#backTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--gradient-accent);
  color: #fff;
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  z-index: 999;
  border: none;
  font-size: 1.2rem;
  opacity: 0;
  visibility: hidden;
}

#backTop.visible {
  opacity: 1;
  visibility: visible;
}

#backTop:hover {
  transform: translateY(-5px) scale(1.1);
  box-shadow: var(--shadow-lg);
}

/* 文章卡片 */
article.card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

article.card time {
  color: var(--text-secondary-light);
  font-size: 0.9rem;
  opacity: 0.8;
}

article.card a {
  color: var(--accent);
  font-weight: 600;
  margin-top: auto;
}

article.card a:hover {
  text-decoration: underline;
}

/* 解决方案区域 */
#solutions > div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

#solutions > div > div {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

#solutions > div > div:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

#solutions h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

/* 联系区域 */
#contact > div:first-of-type {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

#contact > div:first-of-type > div {
  background: var(--glass-bg);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
}

#contact > div:first-of-type > div:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

/* 友情链接 */
#contact a {
  margin: 0 0.5rem;
  padding: 0.25rem 0.75rem;
  background: var(--glass-bg);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  transition: var(--transition);
  display: inline-block;
  margin-bottom: 0.5rem;
}

#contact a:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

/* 移动端适配 */
.mobile-menu {
  display: none;
}

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

  .nav-links {
    display: none;
  }

  .mobile-menu {
    display: block;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  .search-box {
    width: 120px;
  }

  .search-box:focus {
    width: 150px;
  }

  #home > section:first-of-type {
    padding: 3rem 1rem !important;
  }

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

  #solutions > div {
    grid-template-columns: 1fr;
  }

  .footer .container {
    flex-direction: column;
    gap: 1.5rem;
  }

  #backTop {
    bottom: 20px;
    right: 20px;
    padding: 0.6rem 1rem;
  }

  /* FAQ 移动端优化 */
  .faq-question {
    font-size: 1rem;
  }

  /* 表格横向滚动 */
  .table-wrapper {
    overflow-x: auto;
  }

  .table {
    min-width: 600px;
  }
}

/* 暗色模式微调 */
[data-theme="dark"] .nav {
  background: rgba(15, 23, 42, 0.8);
}

[data-theme="dark"] .search-box,
[data-theme="dark"] #theme-toggle {
  background: rgba(30, 41, 59, 0.8);
  border-color: var(--border-dark);
}

[data-theme="dark"] .faq-item {
  border-color: var(--border-dark);
}

[data-theme="dark"] .table td {
  border-color: var(--border-dark);
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
}

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

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

/* 移动端菜单（简单实现） */
.mobile-menu-btn {
  background: none;
  border: none;
  color: var(--text-heading-light);
  font-size: 1.5rem;
  cursor: pointer;
  display: none;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
}

/* 响应式导航折叠 */
@media (max-width: 768px) {
  .nav .container {
    flex-wrap: wrap;
  }

  .nav-links-mobile {
    display: none;
    width: 100%;
    flex-direction: column;
    padding: 1rem 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-md);
    margin-top: 1rem;
  }

  .nav-links-mobile.active {
    display: flex;
  }

  .nav-links-mobile a {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
  }

  .nav-links-mobile a:hover {
    background: rgba(196, 69, 54, 0.1);
  }
}

/* 动画效果 */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* 应用动画 */
.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-slide-in {
  animation: slideIn 0.5s ease;
}

.animate-bounce {
  animation: bounce 2s ease-in-out infinite;
}

/* 打印优化 */
@media print {
  .nav, .footer, #backTop, .btn, .search-box, #theme-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* 性能优化：减少重排 */
.card, .btn, .tag, .faq-item, .nav a, #theme-toggle, .search-box {
  will-change: transform, opacity;
}

/* 高 DPI 屏幕优化 */
@media (min-resolution: 2dppx) {
  .card {
    -webkit-font-smoothing: antialiased;
  }
}

/* 无障碍：焦点可见 */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 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;
  }
}
```