/* roulang page: index */
:root {
      --primary: #1A56DB;
      --accent: #FF6B00;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --card-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
    }
    .hover-lift {
      transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hover-lift:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px -8px rgba(26, 86, 219, 0.12);
    }
    .accordion-content {
      transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .accordion-content.active {
      max-height: 240px;
      opacity: 1;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 44px;
      height: 4px;
      background-color: var(--primary);
      margin-top: 10px;
      border-radius: 2px;
    }
    .section-title.center::after {
      margin-left: auto;
      margin-right: auto;
    }