@keyframes breathe {
            0%, 100% { transform: scale(1); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); }
            50% { transform: scale(1.02); box-shadow: 0 20px 25px -5px rgba(59, 130, 246, 0.3); }
        }
        .breathe-effect { animation: breathe 4s ease-in-out infinite; }