/* roulang page: index */
:root {
      --primary-slate: #0F2830;
      --primary-deep: #08171C;
      --brand-mint: #0D9488;
      --brand-accent: #14B8A6;
      --bg-light: #F6F8F8;
      --text-main: #1E292B;
      --text-muted: #4B5E63;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
    }
    body {
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }
    .custom-container {
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .hero-bg {
      background-image: linear-gradient(135deg, rgba(15, 40, 48, 0.94) 0%, rgba(8, 23, 28, 0.96) 100%), url('/assets/images/4378ce4edbb85a80.webp');
      background-size: cover;
      background-position: center;
    }
    .blueprint-pattern {
      background-image: radial-gradient(#14B8A6 0.75px, transparent 0.75px);
      background-size: 24px 24px;
      opacity: 0.12;
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .soft-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 20px -2px rgba(15, 40, 48, 0.05);
      transition: all 0.25s ease-in-out;
    }
    .soft-card:hover {
      box-shadow: 0 12px 28px -4px rgba(13, 148, 136, 0.15);
      transform: translateY(-4px);
    }
    .accordion-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-body {
      max-height: 380px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }