/* roulang page: index */
:root {
      --primary-teal: #0E4A4E;
      --accent-emerald: #059669;
      --dark-obsidian: #091E21;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-line: #E2E8F0;
      --bg-light: #F8FAFC;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-body);
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      text-rendering: optimizeLegibility;
      -webkit-font-smoothing: antialiased;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }
    .custom-shadow-hover:hover {
      box-shadow: 0 12px 32px rgba(14, 74, 78, 0.08);
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(5, 150, 105, 0.12) 0%, rgba(14, 74, 78, 0.04) 50%, transparent 80%);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-open .accordion-content {
      max-height: 400px;
    }
    .accordion-open .accordion-icon {
      transform: rotate(180deg);
    }