/* roulang page: index */
:root {
      --primary-color: #0F2A4A;
      --accent-teal: #0D9488;
      --accent-cyan: #06B6D4;
      --accent-amber: #D97706;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-xl: 1rem;
    }
    body {
      color: var(--text-body);
      background-color: #FFFFFF;
      overflow-x: hidden;
      font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
      line-height: 1.75;
    }
    .text-title {
      color: var(--text-main);
      letter-spacing: -0.015em;
    }
    .shadow-soft {
      box-shadow: 0 4px 20px rgba(15, 42, 74, 0.06);
    }
    .shadow-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .shadow-hover:hover {
      box-shadow: 0 16px 36px rgba(13, 148, 136, 0.14);
      transform: translateY(-4px);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .grid-pattern {
      background-image: radial-gradient(rgba(13, 148, 136, 0.08) 1px, transparent 1px);
      background-size: 24px 24px;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 280px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(45deg);
      color: #0D9488;
    }