/* roulang page: index */
:root {
            --brand-primary: #2563eb;
            --brand-hover: #1d4ed8;
            --accent-orange: #f97316;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
            --card-shadow-hover: 0 12px 30px -4px rgba(37, 99, 235, 0.12), 0 4px 12px -2px rgba(15, 23, 42, 0.06);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: #ffffff;
            line-height: 1.68;
            -webkit-font-smoothing: antialiased;
        }
        .custom-card {
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-shadow-hover);
        }
        .glass-header {
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background-color: rgba(255, 255, 255, 0.92);
        }
        .tech-badge {
            background: linear-gradient(135deg, rgba(37,99,235,0.08) 0%, rgba(14,165,233,0.08) 100%);
            border: 1px solid rgba(37,99,235,0.18);
        }
        .pulse-subtle {
            animation: pulse-ring 2.5s infinite;
        }
        @keyframes pulse-ring {
            0% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.4); }
            70% { box-shadow: 0 0 0 10px rgba(249, 115, 22, 0); }
            100% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0); }
        }