/* roulang page: index */
:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --bg-slate: #0b0f19;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: #f8fafc;
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-shadow {
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(11, 15, 25, 0.94), rgba(15, 23, 42, 0.82)), url('/assets/images/fe2b646928e7f22c.webp');
      background-size: cover;
      background-position: center;
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.06);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.12);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
      opacity: 0;
    }
    .faq-answer.open {
      max-height: 200px;
      opacity: 1;
    }
    .faq-icon {
      transition: transform 0.3s ease;
    }
    .faq-icon.open {
      transform: rotate(180deg);
    }