/* roulang page: index */
:root {
            --bg-main: #020617;
            --bg-card: #0F172A;
            --cyan-glow: rgba(6, 182, 212, 0.25);
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-main);
            color: #F8FAFC;
            line-height: 1.75;
            overflow-x: hidden;
        }
        .hero-bg {
            background-image: linear-gradient(to bottom, rgba(2, 6, 23, 0.75), rgba(2, 6, 23, 0.95)), url('/assets/images/1638cbc5f7b87dd1.jpg');
            background-size: cover;
            background-position: center;
        }
        .card-glow:hover {
            box-shadow: 0 10px 25px -5px rgba(6, 182, 212, 0.2);
            border-color: rgba(6, 182, 212, 0.5);
            transform: translateY(-4px);
        }
        .tech-border {
            border: 1px solid rgba(148, 163, 184, 0.15);
        }