/* roulang page: index */
:root {
      --primary: #5B21B6;
      --purple: #7C3AED;
      --accent: #F97316;
      --cyan: #06B6D4;
      --dark: #0F172A;
      --night: #1E1B4B;
      --slate-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: #334155;
      background-color: #F8FAFC;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .code-console {
      background: #0B0F19;
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1), 0 20px 40px -15px rgba(0, 0, 0, 0.7);
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 27, 75, 0.92) 100%), url('/assets/images/22332a398ea2dcae.webp') center/cover no-repeat;
    }
    .dark-section-bg {
      background: linear-gradient(180deg, #0F172A 0%, #1E1B4B 100%);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .accordion-content.open {
      max-height: 800px;
      transition: max-height 0.4s ease-in-out;
    }
    .custom-card {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-card:hover {
      transform: translateY(-6px);
    }