/* roulang page: index */
:root {
            --primary-dark: #0A0F1D;
            --primary-navy: #101935;
            --accent-green: #00E599;
            --accent-blue: #0070F3;
            --bg-light: #F4F6F9;
            --text-dark: #0F172A;
            --text-gray: #475569;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-dark);
            -webkit-font-smoothing: antialiased;
        }
        .bg-grid-pattern {
            background-image: radial-gradient(rgba(0, 229, 153, 0.12) 1px, transparent 1px);
            background-size: 28px 28px;
        }
        .nav-link {
            position: relative;
            transition: color 0.3s ease;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-green);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero-banner-bg {
            background: linear-gradient(135deg, rgba(10, 15, 29, 0.95) 0%, rgba(16, 25, 53, 0.92) 100%), url('/assets/images/df10e5ff6737c882.png') center/cover no-repeat;
        }
        .dark-tech-bg {
            background: linear-gradient(180deg, #0A0F1D 0%, #0D1322 100%), url('/assets/images/7550905ae854d9be.jpg') center/cover no-repeat;
            background-blend-mode: overlay;
        }
        .custom-scrollbar::-webkit-scrollbar {
            height: 6px;
            width: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background: #334155;
            border-radius: 4px;
        }