/* roulang page: index */
:root {
            --primary: #059669;
            --primary-dark: #047857;
            --surface-bg: #F8FAFC;
            --surface-card: #FFFFFF;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-light: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            -webkit-font-smoothing: antialiased;
        }
        .text-balance {
            text-wrap: balance;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.82) 100%);
        }
        .card-subtle {
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .card-subtle:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
        }