```css
/* ===== 全局变量与主题 ===== */
:root {
  --bg-page: #f8f7fc;
  --bg-card: #ffffff;
  --bg-soft: #f1eff9;
  --text-primary: #1f1a2e;
  --text-secondary: #2d2b3f;
  --text-body: #1f1a2e;
  --text-heading: #1a1330;
  --text-link: #4c1d95;
  --text-link-hover: #3b0764;
  --text-white: #ffffff;
  --border-light: #ddd8ea;
  --brand-main: #6d28d9;
  --brand-dark: #4c1d95;
  --brand-light: #ede9fe;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.08);
  --radius-md: 16px;
  --radius-sm: 10px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --transition-fast: 0.2s ease;
  --gradient-hero: linear-gradient(135deg, #f0eaff 0%, #ffffff 70%);
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.4);
}

[data-theme="dark"] {
  --bg-page: #12101a;
  --bg-card: #1d1a2b;
  --bg-soft: #262233;
  --text-primary: #f0eff4;
  --text-secondary: #d6d2e3;
  --text-body: #e5e2ee;
  --text-heading: #ffffff;
  --text-link: #b79cf5;
  --text-link-hover: #d4c2ff;
  --text-white: #ffffff;
  --border-light: #3a334f;
  --brand-main: #9d7be9;
  --brand-dark: #b79cf5;
  --brand-light: #2e2744;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #1d1a2b 0%, #12101a 70%);
  --glass-bg: rgba(29, 26, 43, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
}

/* ===== 基础重置与排版 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.7;
  transition: background-color 0.3s, color 0.3s;
  font-size: 1rem;
}

h1, h2, h3, h4, h5 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-heading);
}

h1 {
  font-size: 2.4rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.9rem;
  margin-top: 1.8rem;
  margin-bottom: 1rem;
  border-left: 6px solid var(--brand-main);
  padding-left: 1rem;
}

h3 {
  font-size: 1.4rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: 1.2rem;
  margin-top: 1.2rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1.2rem;
  color: var(--text-body);
}

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

a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}

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

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

.anchor {
  scroll-margin-top: 100px;
}

/* ===== 滚动动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section {
  animation: fadeInUp 0.6s ease-out both;
}

/* 卡片延迟交错入场 */
.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.2s; }
.card:nth-child(5) { animation-delay: 0.25s; }
.card:nth-child(6) { animation-delay: 0.3s; }
.card:nth-child(7) { animation-delay: 0.35s; }
.card:nth-child(8) { animation-delay: 0.4s; }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-light);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.02em;
}

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

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

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--brand-main);
  transition: width 0.3s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle, .menu-toggle {
  background: var(--bg-soft);
  border: none;
  border-radius: 30px;
  padding: 0.4rem 1rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-primary);
  transition: background-color 0.2s, transform 0.2s;
}

.theme-toggle:hover, .menu-toggle:hover {
  background: var(--brand-light);
  transform: scale(1.05);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-soft);
  border-radius: 40px;
  padding: 0.2rem 0.5rem;
  transition: box-shadow 0.2s;
}

.search-box:focus-within {
  box-shadow: 0 0 0 2px var(--brand-main);
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.4rem 0.8rem;
  width: 160px;
  color: var(--text-primary);
  outline: none;
}

.search-box button {
  background: transparent;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: transform 0.2s;
}

.search-box button:hover {
  transform: scale(1.2);
}

.menu-toggle {
  display: none;
}

/* ===== Hero Banner ===== */
.hero {
  background: var(--gradient-hero);
  padding: 3rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, var(--brand-light) 0%, transparent 70%);
  opacity: 0.5;
  animation: float 8s ease-in-out infinite alternate;
}

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

.hero-grid {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1 1 380px;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-heading) 0%, var(--brand-main) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 2rem;
}

.hero-stats div {
  text-align: center;
}

.hero-stats strong {
  font-size: 2.2rem;
  color: var(--brand-dark);
  display: block;
  transition: transform 0.3s;
}

.hero-stats div:hover strong {
  transform: scale(1.1);
}

.hero-visual {
  flex: 1 1 300px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 30px;
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s, box-shadow 0.3s;
}

.hero-visual:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(109, 40, 217, 0.2);
}

.hero-visual svg {
  width: 100%;
  height: auto;
}

/* ===== 通用区块与卡片 ===== */
.section {
  padding: 3.5rem 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.8rem;
  margin-top: 2rem;
}

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

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-main), var(--brand-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

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

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

.card h3 {
  margin-top: 0.2rem;
}

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

.badge {
  background: var(--brand-main);
  color: var(--text-white);
  padding: 0.2rem 0.8rem;
  border-radius: 30px;
  font-size: 0.8rem;
  display: inline-block;
  transition: transform 0.2s;
}

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

/* ===== 文章列表 ===== */
.article-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--border-light);
  padding: 1rem 0;
  transition: padding-left 0.3s;
}

.article-item:hover {
  padding-left: 1rem;
  border-bottom-color: var(--brand-main);
}

.article-item a {
  font-weight: 600;
}

.article-date {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1.2rem;
  margin-bottom: 0.8rem;
  border: 1px solid var(--border-light);
  transition: border-color 0.3s, box-shadow 0.3s;
}

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

.faq-question {
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  color: var(--text-heading);
  user-select: none;
}

.faq-question span {
  transition: transform 0.3s;
  display: inline-block;
}

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

.faq-answer {
  padding-top: 0.8rem;
  color: var(--text-body);
  display: none;
}

/* ===== 按钮 ===== */
.btn-primary {
  background: var(--brand-main);
  color: white;
  border: none;
  padding: 0.6rem 1.4rem;
  border-radius: 40px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s, box-shadow 0.3s;
  box-shadow: 0 4px 12px rgba(109, 40, 217, 0.3);
}

.btn-primary:hover {
  background: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(76, 29, 149, 0.4);
}

/* ===== 双列布局 ===== */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  padding: 3rem 0 1.5rem;
  margin-top: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
}

.footer a {
  color: var(--text-secondary);
  transition: color 0.2s, padding-left 0.2s;
}

.footer a:hover {
  color: var(--brand-main);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  text-align: center;
}

.copyright {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== 回到顶部 ===== */
.to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--brand-main);
  color: white;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 99;
  box-shadow: var(--shadow-md);
  transition: background-color 0.3s, transform 0.3s, opacity 0.3s;
  opacity: 0;
  visibility: hidden;
}

.to-top.visible {
  opacity: 1;
  visibility: visible;
}

.to-top:hover {
  background: var(--brand-dark);
  transform: scale(1.1);
}

/* ===== 响应式设计 ===== */
@media (max-width: 900px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    gap: 1rem;
    flex-direction: column;
    align-items: flex-start;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
  }

  .nav-links.open {
    display: flex;
    animation: fadeInUp 0.3s ease-out;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .menu-toggle {
    display: block;
  }

  .hero-grid {
    flex-direction: column;
  }

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

  .hero-stats {
    gap: 1.5rem;
  }

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

  .grid-2col {
    grid-template-columns: 1fr;
  }

  .search-box {
    display: none;
  }

  .nav-actions {
    gap: 0.5rem;
  }
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.5rem;
  }

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

  .hero-stats strong {
    font-size: 1.6rem;
  }

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

  .container {
    padding: 0 16px;
  }

  .badge {
    font-size: 0.7rem;
  }

  .btn-primary {
    width: 100%;
  }
}

/* ===== 无障碍与细节优化 ===== */
:focus-visible {
  outline: 2px solid var(--brand-main);
  outline-offset: 2px;
}

::selection {
  background-color: var(--brand-main);
  color: white;
}

::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--brand-main);
  border-radius: 10px;
}

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