/* roulang page: index */
:root {
      --color-primary: #1E293B;
      --color-dark: #0F172A;
      --color-accent: #0EA5E9;
      --color-gold: #F59E0B;
      --color-bg: #F8FAFC;
      --color-card: #FFFFFF;
      --text-main: #334155;
      --text-heading: #0F172A;
      --font-stack: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      font-family: var(--font-stack);
      line-height: 1.75;
      letter-spacing: 0.02em;
      color: var(--text-main);
      background-color: var(--color-bg);
      -webkit-font-smoothing: antialiased;
    }
    .custom-scroll::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: #cbd5e1;
      border-radius: 4px;
    }
    .faq-answer {
      transition: max-height 0.35s ease, opacity 0.3s ease;
    }