/* roulang page: index */
:root {
      --primary: #1D4ED8;
      --primary-hover: #1e40af;
      --accent: #0D9488;
      --dark-surface: #0F172A;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-body: #334155;
      --bg-page: #F8FAFC;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      color: var(--text-body);
      line-height: 1.75;
      background-color: var(--bg-page);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .custom-scrollbar::-webkit-scrollbar {
      height: 6px;
      width: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: #cbd5e1;
      border-radius: 4px;
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 138, 0.88) 100%);
    }
    .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 30px -10px rgba(15, 23, 42, 0.12);
    }