@keyframes breathe {
            0%, 100% { box-shadow: 0 0 15px rgba(59, 130, 246, 0.3); }
            50% { box-shadow: 0 0 35px rgba(59, 130, 246, 0.7); }
        }
        .breathe-effect {
            animation: breathe 3.5s infinite ease-in-out;
        }