.breathing-shadow {
            animation: pulse-shadow 3s infinite alternate;
        }
        @keyframes pulse-shadow {
            0% { box-shadow: 0 0 15px rgba(59, 130, 246, 0.2); }
            100% { box-shadow: 0 0 40px rgba(59, 130, 246, 0.6); }
        }
        html { scroll-behavior: smooth; }