```css
:root {
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.7);
  --surface-solid: #ffffff;
  --surface-dark: #111827;
  --text-primary: #1F2937;
  --text-secondary: #2d3e55;
  --text-heading: #111827;
  --link-color: #0b4f9e;
  --accent: #1e4b7a;
  --border: #d1d9e6;
  --footer-bg: #121a2b;
  --footer-text: #cbd5e1;
  --btn-bg: #1e3a6e;
  --btn-text: #ffffff;
  --banner-overlay: rgba(0, 0, 0, 0.4);
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --glass-blur: blur(16px);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a6e 50%, #2d4a7a 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.6), rgba(255,255,255,0.2));
  --gradient-title: linear-gradient(90deg, #dd3b4a, #f59e0b);
  --hover-transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --section-spacing: 4rem;
  --border-radius-lg: 24px;
  --border-radius-md: 16px;
  --border-radius-sm: 8px;
}

body.dark-mode {
  --bg: #0b0e1a;
  --surface: rgba(27, 34, 52, 0.7);
  --surface-solid: #1b2234;
  --surface-dark: #0f172a;
  --text-primary: #E2E8F0;
  --text-secondary: #b8c4d6;
  --text-heading: #F8FAFC;
  --link-color: #8ab8ff;
  --border: #2d3f5e;
  --footer-bg: #0b0e1a;
  --footer-text: #b8c4d6;
  --btn-bg: #3b5f9e;
  --btn-text: #ffffff;
  --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --gradient-card: linear-gradient(145deg, rgba(27,34,52,0.6), rgba(15,23,42,0.3));
}

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

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(30, 75, 122, 0.05) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(221, 59, 74, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

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

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

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 20px;
  border: 2px solid var(--bg);
}

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

/* 导航 */
.navbar {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  transition: var(--hover-transition);
}

body.dark-mode .navbar {
  background: rgba(15, 23, 42, 0.7);
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-heading);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-heading), var(--link-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo span {
  background: var(--gradient-title);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  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(--gradient-title);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

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

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: var(--border-radius-sm);
  font-size: 1.2rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--hover-transition);
}

.menu-toggle:hover {
  background: var(--btn-bg);
  color: var(--btn-text);
}

.dark-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--hover-transition);
}

.dark-toggle:hover {
  background: var(--btn-bg);
  color: var(--btn-text);
  transform: scale(1.05);
}

/* Hero区 */
.hero {
  background: var(--gradient-hero);
  color: white;
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(221, 59, 74, 0.2) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 95, 158, 0.3) 0%, transparent 70%);
  animation: float 10s ease-in-out infinite reverse;
}

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

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  animation: fadeInUp 1s ease-out;
}

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

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  color: #FFFFFF;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  margin-bottom: 20px;
  line-height: 1.2;
  letter-spacing: -1px;
}

.hero h1::selection {
  background: rgba(221, 59, 74, 0.3);
}

.hero p {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: #E5E7EB;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  line-height: 1.6;
}

.hero-cta {
  margin-top: 30px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  background: linear-gradient(135deg, var(--btn-bg), #2d4a7a);
  color: var(--btn-text);
  border: none;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: var(--hover-transition);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

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

.btn-outline {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  box-shadow: none;
}

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

/* 内容区块 */
section {
  position: relative;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  color: var(--text-heading);
  margin: var(--section-spacing) 0 30px;
  position: relative;
  display: inline-block;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 40px;
  height: 4px;
  background: var(--gradient-title);
  border-radius: 4px;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 44px;
  bottom: -8px;
  width: 20px;
  height: 4px;
  background: var(--gradient-title);
  border-radius: 4px;
  opacity: 0.5;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 30px 0;
}

.card {
  background: var(--gradient-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--border-radius-lg);
  padding: 28px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  transition: var(--hover-transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-title);
  transform: scaleX(0);
  transition: transform 0.4s ease;
  transform-origin: left;
}

.card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
}

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

.card h3 {
  color: var(--text-heading);
  font-size: 1.4rem;
  margin-bottom: 16px;
  font-weight: 700;
}

.card h4 {
  color: var(--text-heading);
  font-size: 1.2rem;
  margin-bottom: 12px;
  font-weight: 600;
}

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

.card a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  margin-top: 12px;
  transition: all 0.2s;
}

.card a:hover {
  transform: translateX(4px);
}

.badge {
  background: linear-gradient(135deg, #e8ecf3, #d1d9e6);
  color: #1F2937;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  display: inline-block;
  margin-right: 8px;
  margin-bottom: 8px;
  font-weight: 500;
  transition: var(--hover-transition);
}

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

body.dark-mode .badge {
  background: linear-gradient(135deg, #2d3f5e, #1b2234);
  color: #E5E7EB;
}

/* 表格 */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--border-radius-lg);
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 20px 0;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

th, td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: linear-gradient(135deg, #eef2f7, #e0e8f0);
  color: var(--text-heading);
  font-weight: 600;
  letter-spacing: 0.3px;
}

body.dark-mode th {
  background: linear-gradient(135deg, #1b2234, #2d3f5e);
}

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

tbody tr {
  transition: background 0.3s ease;
}

tbody tr:hover {
  background: rgba(139, 184, 255, 0.05);
}

td {
  color: var(--text-primary);
}

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

.article-list li {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.3s ease;
}

.article-list li:hover {
  padding-left: 12px;
}

.article-list a {
  font-size: 1.15rem;
  color: var(--text-heading);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s;
  display: block;
}

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

.article-list .meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* FAQ */
.faq-item {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-md);
  margin: 16px 0;
  padding: 0;
  overflow: hidden;
  transition: var(--hover-transition);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.faq-item:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  border-color: var(--link-color);
}

.faq-question {
  background: transparent;
  border: none;
  padding: 22px 28px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-heading);
  width: 100%;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s ease;
}

.faq-question:hover {
  background: rgba(139, 184, 255, 0.05);
}

.faq-question span {
  font-size: 0.9rem;
  transition: transform 0.3s ease;
  color: var(--link-color);
}

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

.faq-answer {
  padding: 0 28px 22px;
  color: var(--text-secondary);
  display: none;
  animation: fadeIn 0.4s ease-out;
}

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

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

.faq-answer p {
  margin-bottom: 8px;
  line-height: 1.8;
}

/* footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 60px 0 30px;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(221, 59, 74, 0.5), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
}

.footer-grid h4 {
  color: #ffffff;
  margin-bottom: 16px;
  font-weight: 600;
  position: relative;
  padding-bottom: 8px;
}

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

.footer-grid a {
  color: var(--footer-text);
  text-decoration: none;
  display: block;
  margin-bottom: 10px;
  transition: all 0.2s ease;
  position: relative;
  padding-left: 0;
}

.footer-grid a:hover {
  color: #fff;
  padding-left: 8px;
}

.copyright {
  border-top: 1px solid #2a3550;
  margin-top: 40px;
  padding-top: 24px;
  text-align: center;
  color: #9aa7bd;
  font-size: 0.95rem;
}

.copyright a {
  color: #cbd5e1;
  text-decoration: none;
  transition: color 0.2s;
}

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

/* 联系信息 */
.contact-info {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  padding: 24px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--card-shadow);
}

.contact-info p {
  color: var(--text-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s ease;
}

.contact-info p:hover {
  transform: translateX(4px);
}

/* 滚动按钮 */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--btn-bg), #2d4a7a);
  color: #fff;
  border: none;
  padding: 14px 20px;
  border-radius: 50px;
  cursor: pointer;
  font-size: 1.2rem;
  z-index: 99;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  transition: var(--hover-transition);
  display: none;
}

.scroll-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

/* 通用工具类 */
.lazy-img {
  background: linear-gradient(135deg, #eef1f5, #d1d9e6);
  border-radius: var(--border-radius-md);
}

.stat {
  font-weight: 700;
  font-size: 2rem;
  color: var(--text-heading);
  background: linear-gradient(135deg, var(--btn-bg), #dd3b4a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 链接样式 */
a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* 选择文本 */
::selection {
  background: rgba(221, 59, 74, 0.2);
  color: var(--text-primary);
}

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

  .navbar {
    padding: 12px 16px;
    flex-wrap: wrap;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    position: absolute;
    top: 100%;
    left: 0;
    padding: 20px;
    gap: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.active {
    display: flex;
    animation: slideDown 0.3s ease-out;
  }

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

  .menu-toggle {
    display: block;
  }

  .hero {
    padding: 60px 0 80px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1.1rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    text-align: center;
    padding: 14px 24px;
  }

  .section-title {
    font-size: 1.6rem;
    margin: 3rem 0 20px;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 24px;
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 1rem;
  }

  .faq-answer {
    padding: 0 20px 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .scroll-top {
    bottom: 20px;
    right: 20px;
    padding: 12px 16px;
    font-size: 1rem;
  }

  .copyright {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .logo {
    font-size: 1.3rem;
  }

  .dark-toggle {
    padding: 4px 10px;
    font-size: 0.85rem;
  }
}

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

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

/* 卡片浮动装饰 */
.card::after {
  content: '';
  position: absolute;
  right: -20px;
  bottom: -20px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 184, 255, 0.1) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

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

/* 品牌区特殊样式 */
#brand .card:first-child {
  background: linear-gradient(135deg, rgba(30, 75, 122, 0.05), rgba(255, 255, 255, 0.5));
}

body.dark-mode #brand .card:first-child {
  background: linear-gradient(135deg, rgba(30, 75, 122, 0.2), rgba(15, 23, 42, 0.5));
}

/* 友情链接区域 */
section a[href="#"] {
  display: inline-block;
  padding: 8px 16px;
  margin: 4px;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: 20px;
  border: 1px solid var(--border);
  transition: var(--hover-transition);
}

section a[href="#"]:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border-color: var(--link-color);
}

/* 教程卡片 */
#tutorial .card {
  background: linear-gradient(145deg, var(--surface), transparent);
  border: 1px solid var(--border);
  position: relative;
}

#tutorial .card h3 {
  color: var(--link-color);
}

/* 性能优化 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}
```