/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-light: #2563EB;
            --bg-main: #F8FAFC;
            --text-dark: #0F172A;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-main);
            color: #334155;
            overflow-x: hidden;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(11, 19, 43, 0.92) 0%, rgba(30, 64, 175, 0.85) 100%);
        }
        .bento-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .bento-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
        }