/* roulang page: index */
:root {
      --primary: #0F172A;
      --secondary: #1D4ED8;
      --accent: #059669;
      --highlight: #D97706;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --radius: 0.75rem;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      overflow-x: hidden;
    }
    .custom-container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(11, 19, 43, 0.88) 100%), url('/assets/images/6053d3617262854f.jpg') center/cover no-repeat;
    }
    .dark-band {
      background-color: #0B132B;
    }
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(15, 23, 42, 0.12);
      border-color: #CBD5E1;
    }
    .accordion-content {
      transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .accordion-content.open {
      max-height: 500px;
      opacity: 1;
    }