/* roulang page: index */
:root {
      --primary-blue: #1e3a8a;
      --accent-amber: #d97706;
      --bg-slate: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #64748b;
    }
    body {
      font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      background-color: #f8fafc;
      color: #0f172a;
      -webkit-font-smoothing: antialiased;
    }
    .text-num {
      font-family: 'Inter', monospace;
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.25s ease;
      opacity: 0;
    }
    .accordion-content.open {
      max-height: 280px;
      opacity: 1;
    }
    .hero-slide {
      transition: opacity 0.8s ease-in-out;
    }