.breathe-shadow {
            animation: breathe 3s infinite ease-in-out;
        }
        @keyframes breathe {
            0% { box-shadow: 0 0 15px rgba(156, 163, 175, 0.2); }
            50% { box-shadow: 0 0 30px rgba(107, 114, 128, 0.5); }
            100% { box-shadow: 0 0 15px rgba(156, 163, 175, 0.2); }
        }