/* roulang page: index */
:root {
      --bg-main: #F8FAFC;
      --bg-dark: #0B132B;
      --color-primary: #0F4C81;
      --color-accent: #00A884;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-muted);
      overflow-x: hidden;
    }
    .font-tabular {
      font-variant-numeric: tabular-nums;
    }
    .site-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      transition: all 0.25s ease-in-out;
      box-shadow: 0 1px 3px rgba(0,0,0,0.03);
    }
    .site-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(15,76,129,0.08);
      border-color: #CBD5E1;
    }
    .hero-bg {
      background-image: linear-gradient(rgba(11, 19, 43, 0.88), rgba(11, 19, 43, 0.94)), url('/assets/images/d1374525cb9723e6.jpg');
      background-size: cover;
      background-position: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }