@keyframes breathe {
            0%, 100% { box-shadow: 0 0 15px rgba(59, 130, 246, 0.3); transform: scale(1); }
            50% { box-shadow: 0 0 30px rgba(59, 130, 246, 0.6); transform: scale(1.02); }
        }
        .breathe-effect {
            animation: breathe 4s ease-in-out infinite;
        }