/* roulang page: index */
:root {
      --primary: #0F2537;
      --navy: #183B56;
      --blue: #1D4ED8;
      --teal: #0D9488;
      --bg: #F8FAFC;
      --card-radius: 20px;
    }
    body {
      background-color: var(--bg);
      color: #334155;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .custom-card {
      border-radius: var(--card-radius);
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      box-shadow: 0 10px 30px -5px rgba(15, 37, 86, 0.05);
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 35px -8px rgba(15, 37, 86, 0.12);
    }
    .text-gradient {
      background: linear-gradient(135deg, #1D4ED8 0%, #0D9488 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .btn-gradient {
      background: linear-gradient(135deg, #1D4ED8 0%, #0D9488 100%);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      opacity: 0.94;
      box-shadow: 0 8px 20px rgba(13, 148, 136, 0.35);
    }
    .glass-header {
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      background-color: rgba(255, 255, 255, 0.92);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .accordion-open .accordion-content {
      max-height: 500px;
      transition: max-height 0.35s ease-in-out;
    }
    .accordion-open .accordion-icon {
      transform: rotate(180deg);
    }