/* roulang page: index */
:root {
            --primary: #10B981;
            --primary-dark: #059669;
            --slate-dark: #0F172A;
            --slate-deep: #020617;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --bg-light: #F8FAFC;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            line-height: 1.25;
            font-weight: 700;
        }
        .text-balanced {
            text-wrap: balance;
        }
        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
        }