/* roulang page: index */
:root {
            --brand-primary: #2563eb;
            --brand-gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
            --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --card-hover-shadow: 0 20px 25px -5px rgba(37, 99, 235, 0.1), 0 8px 10px -6px rgba(37, 99, 235, 0.1);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            letter-spacing: 0.01em;
            line-height: 1.68;
            background-color: #f8fafc;
            color: #334155;
        }
        .ui-card-hover {
            transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--card-shadow);
        }
        .ui-card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-hover-shadow);
        }
        .bg-brand-mesh {
            background-image: radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.08) 0px, transparent 50%),
                              radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.08) 0px, transparent 50%);
        }