.bg-gradient-tech {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
        }

.card-hover:hover {
            transform: translateY(-5px);
            transition: all 0.3s ease;
        }

html { scroll-behavior: smooth; }
#back-to-top { transition: opacity 0.3s, visibility 0.3s; }