* { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: #1f2937;
    background: #f7f9fc;
    line-height: 1.6;
  }
  a { text-decoration: none; color: inherit; }
  .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

  /* 顶部导航 */
  .header {
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 100;
  }
  .nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
  }
  .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: #0b5fff;
  }
  .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #0b5fff, #00c2a8);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
  }
  .nav-links {
    display: flex;
    gap: 28px;
  }
  .nav-links a {
    font-size: 15px;
    color: #374151;
    transition: color .2s;
  }
  .nav-links a:hover { color: #0b5fff; }
  .nav-btn {
    background: #0b5fff;
    color: #fff;
    padding: 8px 18px;
    border-radius: 6px;
    font-size: 14px;
    transition: background .2s;
  }
  .nav-btn:hover { background: #0848d1; }

  /* Hero 主视觉 */
  .hero {
    background: linear-gradient(135deg, #0b5fff 0%, #00c2a8 100%);
    color: #fff;
    padding: 90px 0;
  }
  .hero-content {
    max-width: 760px;
  }
  .hero h1 {
    font-size: 42px;
    line-height: 1.3;
    margin-bottom: 20px;
  }
  .hero p {
    font-size: 17px;
    opacity: .95;
    margin-bottom: 32px;
  }
  .hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
  }
  .btn-primary, .btn-outline {
    padding: 12px 26px;
    border-radius: 6px;
    font-size: 15px;
    cursor: pointer;
    transition: all .2s;
    border: none;
  }
  .btn-primary {
    background: #fff;
    color: #0b5fff;
    font-weight: 600;
  }
  .btn-primary:hover { background: #f0f4ff; }
  .btn-outline {
    background: transparent;
    color: #fff;
    border: 1px solid rgba(255,255,255,.6);
  }
  .btn-outline:hover { background: rgba(255,255,255,.1); }

  /* 通用板块 */
  .section {
    padding: 80px 0;
  }
  .section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 12px;
    color: #111827;
  }
  .section-subtitle {
    text-align: center;
    color: #6b7280;
    margin-bottom: 50px;
    font-size: 15px;
  }

  /* 核心业务 */
  .features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .feature-card {
    background: #fff;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,.04);
    transition: transform .2s, box-shadow .2s;
  }
  .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(11,95,255,.1);
  }
  .feature-icon {
    width: 48px;
    height: 48px;
    background: #e8f0ff;
    color: #0b5fff;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 18px;
  }
  .feature-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
  }
  .feature-card p {
    color: #6b7280;
    font-size: 14px;
  }

  /* 平台优势 */
  .advantages {
    background: #fff;
  }
  .advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
  .advantage-item {
    text-align: center;
    padding: 24px;
  }
  .advantage-num {
    font-size: 36px;
    font-weight: 700;
    color: #0b5fff;
    margin-bottom: 8px;
  }
  .advantage-item h4 {
    font-size: 16px;
    margin-bottom: 8px;
  }
  .advantage-item p {
    font-size: 13px;
    color: #6b7280;
  }

  /* 服务对象 */
  .services {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .service-card {
    background: #fff;
    border-radius: 10px;
    padding: 28px 20px;
    text-align: center;
    border: 1px solid #e5e7eb;
    transition: all .2s;
  }
  .service-card:hover {
    border-color: #0b5fff;
    box-shadow: 0 4px 12px rgba(11,95,255,.08);
  }
  .service-card h4 {
    font-size: 16px;
    margin-bottom: 8px;
  }
  .service-card p {
    font-size: 13px;
    color: #6b7280;
  }

  /* 合作入口 */
  .cooperation {
    background: linear-gradient(135deg, #0b5fff 0%, #00c2a8 100%);
    color: #fff;
    text-align: center;
  }
  .cooperation h2 {
    font-size: 30px;
    margin-bottom: 14px;
  }
  .cooperation p {
    opacity: .95;
    margin-bottom: 30px;
  }
  .cooperation .btn-primary {
    color: #0b5fff;
  }

  /* 页脚 */
  .footer {
    background: #111827;
    color: #9ca3af;
    padding: 50px 0 30px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
  }
  .footer h4 {
    color: #fff;
    font-size: 15px;
    margin-bottom: 16px;
  }
  .footer ul { list-style: none; }
  .footer ul li {
    margin-bottom: 8px;
    font-size: 14px;
  }
  .footer ul li a:hover { color: #fff; }
  .footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
  }

  /* 响应式 */
  @media (max-width: 900px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 30px; }
    .features, .advantage-grid, .services, .footer-grid {
      grid-template-columns: 1fr 1fr;
    }
  }
  @media (max-width: 600px) {
    .features, .advantage-grid, .services, .footer-grid {
      grid-template-columns: 1fr;
    }
    .hero { padding: 60px 0; }
    .section { padding: 50px 0; }
  }