/* roulang page: index */
:root {
      --color-primary: #0F172A;
      --color-slate: #1E293B;
      --color-accent: #059669;
      --color-accent-light: #10B981;
      --color-bg-light: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .hero-bg {
      background-image: linear-gradient(to right, rgba(11, 17, 32, 0.92), rgba(15, 23, 42, 0.85)), url('/assets/images/0b1b223a65085b90.jpg');
      background-size: cover;
      background-position: center;
    }
    .spec-card {
      transition: all 0.25s ease-in-out;
    }
    .spec-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 28px -8px rgba(15, 23, 42, 0.12);
    }
    .slide-item {
      display: none;
      opacity: 0;
      transition: opacity 0.5s ease-in-out;
    }
    .slide-item.active {
      display: block;
      opacity: 1;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }