/* Collapse only empty space; keep the slot measurable at its full width. */
.ad-unit { width: 100%; height: 0; margin: 0; padding: 0; overflow: hidden; visibility: hidden; }
.ad-unit[data-filled="true"] { height: auto; margin: 2rem 0; overflow: visible; visibility: visible; }
.ad-unit__label { margin: 0 0 .4rem; color: #b8d8b8; font-size: .75rem; }