@keyframes subtle-glow {
            0%, 100% { box-shadow: 0 0 20px 2px rgba(59, 130, 246, 0.2); }
            50% { box-shadow: 0 0 40px 8px rgba(59, 130, 246, 0.5); }
        }
        .breathing-glow {
            animation: subtle-glow 4s infinite ease-in-out;
        }