/* roulang page: index */
:root {
      --primary: #0F2744;
      --accent: #00A884;
      --night: #091827;
      --border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 39, 68, 0.08);
    }
    .custom-shadow-hover:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px -4px rgba(15, 39, 68, 0.12);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
    }
    .accordion-content.open {
      max-height: 500px;
      transition: max-height 0.35s ease-in-out;
    }