@keyframes pulse-shadow {
            0%, 100% { box-shadow: 0 0 0 0 rgba(31, 41, 55, 0.4); }
            50% { box-shadow: 0 0 15px 8px rgba(31, 41, 55, 0.2); }
        }
        .hero-img-effect { animation: pulse-shadow 3s infinite; }