/* roulang page: index */
:root {
            --brand-primary: #0284c7;
            --brand-electric: #2563eb;
            --dark-surface: #0b0f17;
            --text-main: #0f172a;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #f8fafc;
            overflow-x: hidden;
        }
        .hero-glow {
            background: radial-gradient(circle at 50% 30%, rgba(2, 132, 199, 0.15) 0%, rgba(11, 15, 23, 0) 70%);
        }
        .glass-header {
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .tech-card {
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .tech-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -10px rgba(2, 132, 199, 0.18);
        }