/* roulang page: index */
:root {
      --primary-dark: #0F241D;
      --accent-green: #00D084;
      --vibrant-orange: #FF6B35;
      --bg-slate: #F8FAFC;
      --text-heading: #0F172A;
      --text-body: #334155;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: #F8FAFC;
      color: #334155;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .scroll-anchor {
      scroll-margin-top: 100px;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 36, 29, 0.08);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 16px 32px -6px rgba(15, 36, 29, 0.16);
      transform: translateY(-3px);
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 36, 29, 0.95) 0%, rgba(11, 19, 21, 0.92) 100%);
    }
    .deep-mask {
      background: linear-gradient(180deg, #0B1315 0%, #050B0D 100%);
    }