/* roulang page: index */
:root {
            --primary-navy: #0F172A;
            --primary-blue: #2563EB;
            --accent-green: #059669;
            --surface-light: #F8FAFC;
            --surface-white: #FFFFFF;
            --text-dark: #0F172A;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
            background-color: var(--surface-light);
            color: var(--text-dark);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .hero-banner-bg {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(15, 23, 42, 0.82) 100%), url('/assets/images/52f2d455d6bde5b1.webp');
            background-size: cover;
            background-position: center;
        }
        .science-bg {
            background-image: linear-gradient(180deg, rgba(17, 24, 39, 0.98) 0%, rgba(17, 24, 39, 0.95) 100%), url('/assets/images/895a548e87c6f901.webp');
            background-size: cover;
            background-position: center;
        }
        .text-balance {
            text-wrap: balance;
        }
        .glass-card {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }