/* roulang page: index */
:root {
      --primary-gradient: linear-gradient(135deg, #0F52BA 0%, #00A86B 100%);
      --accent-color: #F59E0B;
      --bg-slate-soft: #F8FAFC;
      --bg-slate-card: #F1F5F9;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --radius-large: 1.25rem;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: #334155;
      background-color: #F8FAFC;
      line-height: 1.7;
    }
    .brand-gradient-bg {
      background: var(--primary-gradient);
    }
    .brand-gradient-text {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .card-hover-effect {
      transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -8px rgba(15, 82, 186, 0.12), 0 8px 16px -4px rgba(0, 168, 107, 0.08);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
    }