/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-dark: #115E59;
      --accent: #F97316;
      --bg-slate: #0F172A;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --card-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-body);
      background-color: #F8FAFC;
    }
    .hero-stat-badge {
      backdrop-filter: blur(8px);
      background: rgba(255, 255, 255, 0.9);
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 118, 110, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 16px 32px -4px rgba(15, 118, 110, 0.14), 0 4px 12px -2px rgba(0, 0, 0, 0.06);
      transform: translateY(-3px);
    }
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }