/* roulang page: index */
:root {
            --bg-base: #F8FAFC;
            --text-main: #334155;
            --text-muted: #64748B;
            --brand-deep: #0F172A;
            --brand-highlight: #0EA5E9;
            --border-light: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", PingFang SC, "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: var(--text-main);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }
        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
            color: var(--brand-deep);
            font-weight: 700;
        }
        .hero-video-mask {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.78) 50%, rgba(2, 132, 199, 0.82) 100%);
        }
        .bento-card {
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 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);
        }