/* roulang page: index */
:root {
            --brand-dark: #0F172A;
            --brand-accent: #2563EB;
            --brand-accent-hover: #1D4ED8;
            --brand-bg: #F8FAFC;
            --brand-card: #FFFFFF;
            --brand-border: #E2E8F0;
            --brand-text: #334155;
            --brand-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--brand-text);
            background-color: var(--brand-bg);
            overflow-x: hidden;
        }
        .section-separator {
            border-bottom: 1px solid var(--brand-border);
        }
        .hero-banner-bg {
            background-image: linear-gradient(to right, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.8)), url('/assets/images/137ffab437db9afb.webp');
            background-size: cover;
            background-position: center;
        }
        .philosophy-bg {
            background-image: linear-gradient(to right, rgba(10, 15, 29, 0.98), rgba(10, 15, 29, 0.92)), url('/assets/images/8a8c613e6f13b4d0.webp');
            background-size: cover;
            background-position: center;
        }