/* roulang page: index */
:root {
      --primary: #0284C7;
      --primary-dark: #0F172A;
      --accent: #0D9488;
      --bg-base: #F8FAFC;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      color: #334155;
      background-color: #F8FAFC;
      overflow-x: hidden;
    }
    .hero-bg {
      background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.94), rgba(11, 15, 25, 0.96)), url('/assets/images/877d94a668e52d9c.jpg');
      background-size: cover;
      background-position: center;
    }
    .tech-grid-bg {
      background-image: linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px), linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
      background-size: 32px 32px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      opacity: 0;
    }
    .faq-answer.open {
      max-height: 300px;
      opacity: 1;
    }
    .chevron-icon {
      transition: transform 0.3s ease;
    }
    .chevron-icon.rotate {
      transform: rotate(180deg);
    }