/*
 * Site header stacking — the header paints over everything pinned below it.
 *
 * The header part is unpositioned, so its dropdowns (core's submenu, z-index
 * 2) stack in the root context, under every sticky thing the page scrolls
 * past: core's sticky groups (10) and the anchor nav (11). An open dropdown
 * then slides behind them. Positioning the part with a z-index lifts it, and
 * everything in it, over all of them. 100 leaves headroom over any z-index a
 * block takes in Additional CSS (§10), and stays under Woo's gallery
 * lightbox (woo-product-gallery.css lifts its column to 1000). Modals are
 * <dialog> in the top layer, above any z-index.
 *
 * The mobile menu overlay (core's z-index 100000) is now capped at 100 too,
 * which still covers the page; only the admin bar (99999, logged in only)
 * paints over it, and core already offsets the overlay below the admin bar.
 */
.wp-site-blocks > header.wp-block-template-part {
	position: relative;
	z-index: 100;
}