/* ── SHARED HEADER: ZERO-FLASH PRE-HIDE ───────────────────────────────── style.css is a blocking stylesheet, so these rules apply BEFORE the browser renders any of the body — eliminating the flash-of-original- header (FOSH) that occurs when shared-header.js is loaded with defer. Pages that opt out of the shared header add class="sk-no-header" to their tag; that class overrides every rule here so their own navs remain visible. The shared header itself (#sk-top-nav) and the bottom nav are excluded. .sk-sub-nav is ALSO excluded — and it was not, which deleted a primary CTA from several hubs on every device. This rule hides the old page-level headers a page shipped before the shared header existed. But a hub's sticky sub-nav (Healthcare "Register Facility", Car Hub "Sell Vehicle", Entertainment, Tech Hub, Product) is not an old header — it is the bar that holds the hub's main action, and shared-header.js deliberately keeps it alive with :not(.sk-sub-nav) in its own hide rule. This one never got the same exclusion, and it is !important and render-blocking, so it won. The result: any hub whose sub-nav was built as a