<style>
    /* 精简、高效、必应友好CSS — 蓝色科技风格 */
    :root {
      --primary: #0a66c2;
      --primary-dark: #004182;
      --primary-light: #e8f0fe;
      --accent: #00a8ff;
      --gray-bg: #f5f9ff;
      --text-main: #1e2b3c;
      --text-muted: #4a5c6b;
      --border-light: #d0e0f0;
      --shadow-sm: 0 4px 12px rgba(0,102,204,0.08);
      --shadow-md: 0 8px 24px rgba(0,65,130,0.12);
      --radius: 20px;
      --radius-sm: 12px;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      background: #fff;
      color: var(--text-main);
      line-height: 1.5;
    }
    a { text-decoration: none; color: inherit; }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 头部 — 符合语义化 */
    .site-header {
      background: #fff;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.9);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo a {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #0a66c2 0%, #0099ff 80%);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .logo span { font-weight: 300; color: #1e2b3c; background: none; -webkit-text-fill-color: initial; }
    .nav ul {
      display: flex;
      gap: 40px;
      list-style: none;
    }
    .nav a {
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav a:hover, .nav a.active { color: var(--primary); border-bottom-color: var(--primary); }
    /* 按钮 */
    .btn {
      display: inline-block;
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 12px 32px;
      border-radius: 60px;
      box-shadow: 0 6px 14px rgba(10,102,194,0.25);
      transition: all 0.15s;
      border: none;
      cursor: pointer;
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      box-shadow: none;
      border: 1.5px solid var(--primary);
    }
    .btn:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 10px 20px rgba(10,102,194,0.3); }
    .btn-outline:hover { background: var(--primary-light); color: var(--primary-dark); }
    /* 版块通用 */
    section { padding: 70px 0; }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: #0b2b4a;
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 48px;
    }
    .text-center { text-align: center; }
    /* 首页英雄下载区 — 满屏大气 */
    .hero {
      background: linear-gradient(145deg, #e3f0ff 0%, #ffffff 80%);
      border-radius: 0 0 48px 48px;
      padding: 60px 0 80px;
      margin-bottom: 20px;
    }
    .hero h1 {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      color: #0a2540;
    }
    .hero .highlight { color: var(--primary); }
    .hero-desc {
      font-size: 20px;
      max-width: 800px;
      margin: 0 auto 32px;
      color: #2c4258;
    }
    .btn-group { display: flex; gap: 20px; justify-content: center; margin: 32px 0; }
    .stats-mini {
      display: flex;
      justify-content: center;
      gap: 48px;
      margin-top: 40px;
    }
    .stat-item { text-align: center; }
    .stat-num { font-size: 28px; font-weight: 800; color: var(--primary-dark); }
    .stat-label { color: var(--text-muted); }
    .stars { color: #f5b342; letter-spacing: 4px; font-size: 22px; }
    /* 卡片网格 */
    .grid-4, .grid-3 {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 28px;
    }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .card {
      background: white;
      padding: 28px 20px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      border: 1px solid #eaf1fb;
      transition: 0.2s;
    }
    .card:hover { box-shadow: var(--shadow-md); }
    .card-icon { font-size: 40px; margin-bottom: 20px; }
    .card h3 { font-size: 22px; margin-bottom: 12px; color: #0a2540; }
    .check-list { list-style: none; margin-top: 16px; }
    .check-list li { padding: 6px 0; color: var(--text-muted); }
    .check-list li::before { content: "✓"; color: var(--primary); font-weight: bold; margin-right: 10px; }
    /* 平台图标 */
    .platform-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px; margin: 40px 0; }
    .platform-item { text-align: center; min-width: 100px; }
    /* FAQ折叠 — details/summary */
    .faq-list { max-width: 900px; margin: 0 auto; }
    .faq-item {
      background: white;
      border-radius: 20px;
      margin-bottom: 12px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      border: 1px solid var(--border-light);
    }
    .faq-item summary {
      padding: 22px 28px;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      list-style: none;
      display: flex;
      align-items: center;
    }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "▼"; margin-left: auto; font-size: 14px; color: var(--primary); transition: 0.2s; }
    .faq-item[open] summary::after { transform: rotate(180deg); }
    .faq-answer { padding: 0 28px 24px 28px; color: var(--text-muted); border-top: 1px dashed var(--border-light); }
    /* 底部 */
    .site-footer {
      background: #0a1a2b;
      color: #ccddee;
      padding: 48px 0 24px;
      margin-top: 40px;
    }
    .footer-nav { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 40px; }
    .footer-links h4 { color: white; margin-bottom: 16px; }
    .footer-links ul { list-style: none; }
    .footer-links li { margin: 8px 0; }
    .footer-links a { color: #b0c7e0; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
    .tag { background: #1e3a5f; padding: 4px 12px; border-radius: 40px; font-size: 14px; color: #bdd6f0; }
    .copyright { text-align: center; border-top: 1px solid #1e405b; padding-top: 28px; margin-top: 28px; }
    /* 响应式 */
    @media (max-width: 768px) {
      .grid-4, .grid-3 { grid-template-columns: 1fr; }
      .header-inner { flex-direction: column; height: auto; padding: 16px 0; gap: 10px; }
      .nav ul { gap: 24px; }
      .hero h1 { font-size: 36px; }
      .stats-mini { flex-direction: column; gap: 20px; }
    }
    /* 实用 */
    .mb-2 { margin-bottom: 16px; }
    .mt-4 { margin-top: 40px; }
    .bg-light { background: var(--gray-bg); }
  </style>