/* roulang page: index */
:root {
            --primary-blue: #1d4ed8;
            --primary-hover: #1e40af;
            --slate-dark: #0f172a;
            --slate-light: #f8fafc;
            --border-color: #e2e8f0;
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        .card-transition {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-transition:hover {
            transform: translateY(-4px);
        }
        .gradient-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 138, 0.88) 100%);
        }
        .hero-pattern {
            background-color: #ffffff;
            background-image: radial-gradient(#e2e8f0 1px, transparent 1px);
            background-size: 24px 24px;
        }