/* roulang page: index */
:root {
      --bg-dark: #0B0F19;
      --bg-slate: #111827;
      --bg-light: #F8FAFC;
      --primary: #0E7490;
      --primary-hover: #0284C7;
      --accent-green: #10B981;
      --accent-cyan: #06B6D4;
      --border-dark: #1E293B;
      --border-light: #E2E8F0;
      --text-main: #0F172A;
      --text-muted: #64748B;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    }

    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      overflow-x: hidden;
      line-height: 1.75;
    }

    .tech-pattern {
      background-image: radial-gradient(rgba(14, 116, 144, 0.12) 1px, transparent 1px);
      background-size: 28px 28px;
    }

    .tech-pattern-dark {
      background-image: radial-gradient(rgba(6, 182, 212, 0.15) 1px, transparent 1px);
      background-size: 28px 28px;
    }

    .card-hover {
      transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease, border-color 0.3s ease;
    }

    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
      border-color: #0E7490;
    }

    .faq-content {
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
    }

    /* 移动端汉堡菜单样式 */
    #mobileMenu {
      transition: transform 0.3s ease-in-out;
    }