.collection-list li:nth-of-type(even) {
    margin-top: 1.5rem;
}
@media screen and (min-width: 1024px) {
    .collection-list li:nth-of-type(even) {
        margin-top: 0;
    }
    .collection-list li:nth-of-type(3n+2) {
        margin-top: 1.5rem;
    }
}