/* roulang page: index */
:root {
            --brand-blue: #1E40AF;
            --tech-cyan: #0EA5E9;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #475569;
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.88), rgba(30, 64, 175, 0.82)), url('/assets/images/18b46289a8caed6e.webp');
            background-size: cover;
            background-position: center;
        }
        .banner-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.95)), url('/assets/images/ce80b3a669b76c4d.webp');
            background-size: cover;
            background-position: center;
        }
        .card-shadow {
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.02);
            transition: all 0.3s ease;
        }
        .card-shadow:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 30px -10px rgba(30, 64, 175, 0.12);
        }