- Restore explicit overflow-y:auto on #main-app for mobile (removed in 63f5d64) — implicit coercion from overflow-x:auto is not reliable in all Safari/WebKit versions. - Override position:sticky on .readme to position:relative on mobile. The desktop sticky (left:0) is correct for horizontal scroll, but on mobile vertical scroll it pinned the 100dvh-tall readme across the entire viewport, hiding all stacked notes behind it.