/* roulang page: index */
:root {
      --primary: #0f172a;
      --accent: #14b8a6;
      --accent-cyan: #22d3ee;
      --bg-slate: #f8fafc;
      --border-color: #e2e8f0;
      --text-main: #1e293b;
      --text-muted: #64748b;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      -webkit-font-smoothing: antialiased;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(2, 6, 23, 0.92) 100%), url('/assets/images/6580dd79ca2fc5a2.webp') center/cover no-repeat;
    }
    .dark-tech-pattern {
      background-color: #020617;
      background-image: radial-gradient(rgba(20, 184, 166, 0.12) 1px, transparent 1px);
      background-size: 28px 28px;
    }
    .accordion-content {
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
    }
    .tab-btn.active {
      border-color: #14b8a6;
      color: #14b8a6;
      background-color: rgba(20, 184, 166, 0.08);
    }