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The watch label, version selectors, diff options and tabs move into a sticky #diff-header, and the top menu above it (watch URL, EDIT, theme and GitHub links) becomes sticky too, so the whole header stays on screen while the diff scrolls. The minimap and anchor jumps offset by the measured height of both bars instead of a fixed value. Heights are measured on load and kept current with a ResizeObserver where it is available, falling back to the window resize and hashchange events as the restock graph and queue sparkline already do, plus one deferred measure at load - the tab switch hides #settings and so resizes the header without a window resize, and opening a link already at #screenshot does the same with no hashchange to follow. The app header is stored before the diff header is measured, since the latter's cap is derived from the former. A sticky bar must be opaque to the content scrolling beneath it, but the page's own backdrop is a fixed full-viewport gradient layer over the page colour, so a flat --color-background panel reads as a white band cutting across it. Instead each bar repaints that same backdrop via a shared page-surface-gradient mixin: the three gradient stops pre-composited against --color-background-page with color-mix() at the layer's 0.91 opacity, with background-attachment: fixed so they stay registered with body::after. Children of #diff-header are centred with a flex column, mirroring the align-items: center that section.content applies to the non-sticky siblings, so the controls panel and tabs keep their intrinsic width and standard colours. The top menu is made sticky only under body.difference-page. Upstream already wants this globally (see the @todo in parts/_top_menu.scss) but held off because the bar has no background of its own; scoping it here keeps that decision separate. Sticky makes .header a stacking context, so its mobile drawer is capped at the bar's z-index of 30 - high enough to cover #diff-header, low enough that the action rail's hover flyout and toast notifications still paint over the bar as before. The activity strip is fixed on body in the root stacking context, so it would have painted through the capped drawer; on this page it drops just below the bar rather than raising the bar past the rail. Dropping the 40px section.content padding and tightening the title's own padding closes the gap between the two bars, and #diff-header's half-viewport cap now excludes the top menu so the sticky stack stays within the same budget on short viewports. .app-main's 0.55rem gap goes too on this page: it sits between the two sticky bars, so the diff header would otherwise start 8.8px below the top menu and slide up to meet it over the first 8.8px of scroll. That gap cannot survive sticking - it is outside both bars, so the diff would scroll through it - and the bars are flush at every scroll position instead. Co-authored-by: Engineer <engineer@agents.matrixsi.com> Co-authored-by: Jeff Hedlund <jhedlund@gmail.com> Signed-off-by: Jeff Hedlund <jhedlund@gmail.com>