/* roulang page: index */
:root {
      --primary-dark: #0B0F17;
      --secondary-dark: #0F172A;
      --accent-cyan: #06B6D4;
      --accent-sky: #0EA5E9;
      --accent-amber: #F59E0B;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --bg-light: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: #334155;
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.7;
    }
    .custom-scrollbar::-webkit-scrollbar {
      height: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: #CBD5E1;
      border-radius: 4px;
    }
    .glass-nav {
      background: rgba(15, 23, 42, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .gradient-hero-overlay {
      background: linear-gradient(135deg, rgba(11, 15, 23, 0.94) 0%, rgba(15, 23, 42, 0.88) 60%, rgba(6, 182, 212, 0.4) 100%);
    }
    .card-hover-fx {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-fx:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.12);
    }