/* roulang page: index */
:root {
      --primary-dark: #0B0F19;
      --card-bg: #111827;
      --brand-blue: #3B82F6;
      --brand-indigo: #6366F1;
      --brand-emerald: #10B981;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: #F8FAFC;
      color: #0F172A;
      overflow-x: hidden;
    }
    .smooth-scroll { scroll-behavior: smooth; }
    .hero-mask {
      background: linear-gradient(180deg, rgba(11, 15, 25, 0.88) 0%, rgba(11, 15, 25, 0.96) 100%);
    }
    .wave-glow {
      box-shadow: 0 0 35px -5px rgba(59, 130, 246, 0.3);
    }
    .hover-card-lift {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .hover-card-lift:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    }