.breathing-shadow {
            animation: breathe 3s infinite ease-in-out;
        }
        @keyframes breathe {
            0%, 100% { box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); transform: translateY(0); }
            50% { box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15); transform: translateY(-3px); }
        }