/* roulang page: index */
:root {
            --color-dark: #0B0F19;
            --color-slate: #1E293B;
            --color-primary: #2563EB;
            --color-cyan: #06B6D4;
            --color-emerald: #10B981;
            --color-surface: #F8FAFC;
        }
        html { scroll-behavior: smooth; }
        body { font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(11, 15, 25, 0.94) 0%, rgba(30, 41, 59, 0.92) 100%);
        }
        .tech-gradient-border {
            border-image: linear-gradient(to right, #06B6D4, #2563EB) 1;
        }
        .custom-scrollbar::-webkit-scrollbar {
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background-color: #cbd5e1;
            border-radius: 4px;
        }