/* roulang page: index */
:root {
      --color-primary: #0284C7;
      --color-cyan: #0EA5E9;
      --color-amber: #F59E0B;
      --color-dark: #0F141C;
      --color-surface: #181F2A;
      --color-light: #F8FAFC;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      color: #1E293B;
      background-color: #FFFFFF;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(14, 165, 233, 0.18) 0%, rgba(15, 20, 28, 0) 70%);
    }
    .tech-grid {
      background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 0);
      background-size: 24px 24px;
    }
    .custom-card-shadow {
      box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px -4px rgba(2, 132, 199, 0.15);
    }
    .tab-btn.active {
      background-color: #0284C7;
      color: #FFFFFF;
      border-color: #0284C7;
    }
    .faq-answer {
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .code-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .code-scroll::-webkit-scrollbar-thumb {
      background: rgba(255, 255, 255, 0.2);
      border-radius: 3px;
    }