/* roulang page: index */
:root {
      --primary-blue: #0F52BA;
      --deep-blue: #1E3A8A;
      --accent-orange: #FF5722;
      --bg-light: #F8FAFC;
      --dark-slate: #0F172A;
      --card-radius: 20px;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: #1E293B;
      line-height: 1.7;
    }
    .gradient-hero-btn {
      background: linear-gradient(135deg, #0F52BA 0%, #06B6D4 100%);
    }
    .gradient-orange-btn {
      background: linear-gradient(135deg, #FF5722 0%, #F59E0B 100%);
    }
    .badge-blur {
      background: rgba(15, 82, 186, 0.08);
      border: 1px solid rgba(15, 82, 186, 0.2);
    }
    .card-hover-effect {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 82, 186, 0.12), 0 8px 10px -6px rgba(15, 82, 186, 0.08);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }
    .code-block-bg {
      background: #0B1120;
      border: 1px solid #1E293B;
    }