/* roulang page: index */
:root {
      --color-brand-dark: #0F242A;
      --color-brand-navy: #0B192C;
      --color-brand-teal: #0D9488;
      --color-brand-emerald: #059669;
      --color-brand-bg: #F8FAFC;
      --font-stack: system-ui, -apple-system, "PingFang SC", "HarmonyOS Sans", "Microsoft YaHei", "Source Han Sans", sans-serif;
    }
    body {
      font-family: var(--font-stack);
      color: #334155;
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.75;
    }
    .custom-scrollbar::-webkit-scrollbar {
      width: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: #CBD5E1;
      border-radius: 3px;
    }
    .trans-smooth {
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -10px rgba(15, 36, 42, 0.08);
      border-color: #0D9488;
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .hero-pattern {
      background-image: radial-gradient(rgba(13, 148, 136, 0.08) 1px, transparent 0);
      background-size: 24px 24px;
    }