/* roulang page: index */
:root { --font-main: 'PingFang SC', 'Microsoft YaHei', sans-serif; }
        body { font-family: var(--font-main); color: #334155; }
        .section-padding { padding-top: 4rem; padding-bottom: 4rem; }
        @media (min-width: 768px) { .section-padding { padding-top: 6rem; padding-bottom: 6rem; } }
        .bg-gradient-tech { background: linear-gradient(135deg, #0B0F19 0%, #1e293b 100%); }
        .nav-link { transition: color 0.3s; }
        .nav-link:hover { color: #00D2B4; }