/* roulang page: index */
:root {
            --brand-primary: #4F46E5;
            --brand-accent: #FF6B4A;
            --text-main: #1E293B;
            --text-muted: #475569;
            --bg-light: #F9F9FB;
            --border-color: #E2E8F0;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.75;
            scroll-behavior: smooth;
        }
        .text-balanced {
            line-height: 1.25;
            letter-spacing: -0.02em;
        }
        .custom-shadow {
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
        }
        .custom-shadow-hover:hover {
            box-shadow: 0 20px 35px -10px rgba(79, 70, 229, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
            transform: translateY(-4px);
        }
        .transition-smooth {
            transition: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
        }