/* roulang page: index */
:root {
      --primary: #0F2942;
      --accent: #00B5AD;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: #0F172A;
      background-color: #FFFFFF;
      line-height: 1.75;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(9, 19, 29, 0.92) 0%, rgba(15, 41, 66, 0.88) 100%), url('/assets/images/bbfa7a3207f3f67c.webp') center/cover no-repeat;
    }
    .dark-engine-bg {
      background: linear-gradient(180deg, #09131D 0%, #0D1E2F 100%);
    }
    .card-hover-shadow {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -8px rgba(15, 41, 66, 0.12);
    }
    .countdown-circle {
      stroke-dasharray: 283;
      stroke-dashoffset: 45;
      transform: rotate(-90deg);
      transform-origin: 50% 50%;
    }
    .faq-answer {
      transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
    }