/* roulang page: index */
:root {
            --primary: #1d4ed8;
            --primary-hover: #1e40af;
            --accent: #f97316;
            --bg-light: #f8fafc;
            --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;
            scroll-behavior: smooth;
        }
        .hero-banner-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.75), rgba(15, 23, 42, 0.85)), url('/assets/images/b81f022dfd61208d.webp');
            background-size: cover;
            background-position: center;
        }
        .tech-dark-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.98)), url('/assets/images/dc772787e4c6940e.jpg');
            background-size: cover;
            background-position: center;
        }
        .cta-gradient-bg {
            background-image: linear-gradient(135deg, rgba(29, 78, 216, 0.95), rgba(2, 132, 199, 0.9)), url('/assets/images/eacd87fa39e2eed3.jpg');
            background-size: cover;
            background-position: center;
        }
        .card-custom {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
        }