.breathing-shadow {
        box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
        animation: breathe 3s ease-in-out infinite;
    }
    @keyframes breathe {
        0% { box-shadow: 0 0 15px rgba(59, 130, 246, 0.4); }
        50% { box-shadow: 0 0 35px rgba(59, 130, 246, 0.8); }
        100% { box-shadow: 0 0 15px rgba(59, 130, 246, 0.4); }
    }