/* roulang page: index */
:root {
      --primary: #0F3D3E;
      --secondary: #10B981;
      --accent-orange: #F97316;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-subtle: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 61, 62, 0.94) 0%, rgba(11, 27, 28, 0.96) 100%);
    }
    .custom-shadow {
      box-shadow: 0 10px 30px -5px rgba(15, 61, 62, 0.08);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .accordion-item.active .accordion-content {
      max-height: 280px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }
    .carousel-slide {
      display: none;
      opacity: 0;
      transition: opacity 0.5s ease-in-out;
    }
    .carousel-slide.active {
      display: block;
      opacity: 1;
    }