.layout-selector{display:flex;gap:10px;margin-bottom:15px}.layout-selector button{background:#f0f0f0;border:1px solid #ccc;cursor:pointer;padding:10px}.layout-selector button.is-primary{background:#007cba;border-color:#007cba;color:#fff}.columns-preview{display:grid;gap:10px}.columns-preview.columns-1{grid-template-columns:1fr}.columns-preview.columns-2{grid-template-columns:1fr 1fr}.columns-preview.columns-3{grid-template-columns:1fr 1fr 1fr}.columns-preview.columns-4{grid-template-columns:1fr 1fr 1fr 1fr}