/* roulang page: index */
:root {
            --primary: #1E40AF;
            --accent: #3B82F6;
            --teal: #0D9488;
            --dark: #0F172A;
            --bg: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.78), rgba(30, 64, 175, 0.82)), url('/assets/images/a43d3fd8896113ac.webp');
            background-size: cover;
            background-position: center;
        }
        .hero-banner-accent {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.88), rgba(13, 148, 136, 0.75)), url('/assets/images/5caba7decc40b9e1.jpg');
            background-size: cover;
            background-position: center;
        }
        .transition-all-custom {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
        }