@keyframes breathing-shadow {
            0% { box-shadow: 0 0 15px rgba(37, 99, 235, 0.2); }
            50% { box-shadow: 0 0 35px rgba(37, 99, 235, 0.5); }
            100% { box-shadow: 0 0 15px rgba(37, 99, 235, 0.2); }
        }
        .breathe-effect { animation: breathing-shadow 3s infinite ease-in-out; }