/* roulang page: index */
:root {
      --primary-navy: #1E3A8A;
      --accent-blue: #2563EB;
      --dynamic-cyan: #06B6D4;
      --bg-slate: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #334155;
      --card-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-slate);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-shadow {
      box-shadow: 0 4px 12px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    }
    .hover-shadow {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hover-shadow:hover {
      box-shadow: 0 20px 25px -5px rgba(30, 58, 138, 0.1), 0 8px 10px -6px rgba(30, 58, 138, 0.08);
      transform: translateY(-4px);
    }
    .hero-mesh {
      background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
                  radial-gradient(circle at 10% 80%, rgba(6, 182, 212, 0.06) 0%, transparent 45%),
                  #F8FAFC;
    }
    .card-stack-1 {
      transform: rotate(-2.5deg) translateY(12px);
      z-index: 10;
    }
    .card-stack-2 {
      transform: rotate(2.5deg) translateY(18px);
      z-index: 10;
    }
    .card-stack-main {
      z-index: 20;
    }