/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #06B6D4;
      --accent-emerald: #10B981;
      --bg-light: #F8FAFC;
      --card-border: #E2E8F0;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .custom-shadow {
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 20px 30px -10px rgba(30, 64, 175, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
      transform: translateY(-4px);
    }
    .hero-badge-glow {
      box-shadow: 0 0 20px rgba(6, 182, 212, 0.25);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.3s ease;
    }
    .accordion-content.open {
      max-height: 500px;
    }