/* roulang page: index */
:root {
      --brand-primary: #0F766E;
      --brand-dark: #0A1926;
      --brand-blue: #0284C7;
      --brand-bg: #F8FAFC;
      --brand-border: #E2E8F0;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    body {
      color: var(--text-main);
      background-color: var(--brand-bg);
      font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      -webkit-font-smoothing: antialiased;
    }
    .hero-bg-pattern {
      background-image: radial-gradient(#0f766e15 1px, transparent 1px), radial-gradient(#0284c715 1px, #f8fafc 1px);
      background-size: 40px 40px;
      background-position: 0 0, 20px 20px;
    }
    .custom-shadow {
      box-shadow: 0 4px 24px -4px rgba(15, 118, 110, 0.08);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .faq-content.open {
      max-height: 400px;
      transition: max-height 0.4s ease-in-out;
    }
    .step-line::after {
      content: '';
      position: absolute;
      top: 24px;
      left: 50%;
      width: 100%;
      height: 2px;
      background: #E2E8F0;
      z-index: 1;
    }
    @media (max-width: 1023px) {
      .step-line::after { display: none; }
    }