/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #06B6D4;
      --accent-glow: rgba(6, 182, 212, 0.25);
      --bg-light: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: #F8FAFC;
      color: #1E293B;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(6, 182, 212, 0.18) 0%, rgba(15, 23, 42, 0) 70%);
    }
    .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 16px 32px -8px rgba(6, 182, 212, 0.15);
      border-color: rgba(6, 182, 212, 0.5);
    }
    .diagonal-band {
      clip-path: polygon(0 4vw, 100% 0, 100% calc(100% - 4vw), 0 100%);
    }