/* roulang page: index */
:root {
            --color-primary: #0052FF;
            --color-teal: #00D2B4;
            --color-dark: #0B0F17;
            --color-dark-panel: #0F141C;
            --color-border: #E5E7EB;
            --color-gray-soft: #F8F9FA;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
            color: #111827;
            background-color: #FFFFFF;
            line-height: 1.7;
        }
        .text-balanced { text-wrap: balance; }
        .hero-bg {
            background-image: linear-gradient(135deg, rgba(11, 15, 23, 0.94) 0%, rgba(15, 20, 28, 0.88) 100%), url('/assets/images/b84ba3ac39c47eb1.webp');
            background-size: cover;
            background-position: center;
        }
        .deep-dark-bg {
            background-image: linear-gradient(180deg, rgba(11, 15, 23, 0.98) 0%, rgba(15, 20, 28, 0.96) 100%), url('/assets/images/2b1f0a0419e58ab4.webp');
            background-size: cover;
            background-position: center;
        }
        .tech-shadow {
            box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .tech-shadow:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 28px -4px rgba(0, 82, 255, 0.12);
        }