/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --secondary: #059669;
      --dark-accent: #0F172A;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --card-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-body);
      background-color: var(--bg-light);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      overflow-x: hidden;
    }
    .custom-shadow {
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 20px 25px -5px rgba(30, 64, 175, 0.1), 0 8px 10px -6px rgba(30, 64, 175, 0.1);
      transform: translateY(-4px);
    }
    .transition-standard {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.35s ease;
    }
    .accordion-item.active .accordion-content {
      max-height: 240px;
      padding-top: 1rem;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }
    .hero-slide {
      display: none;
      opacity: 0;
      transition: opacity 0.8s ease-in-out;
    }
    .hero-slide.active {
      display: block;
      opacity: 1;
    }