The phone block lifted the toolbar (and padded .main) by (100vh - --app-height) on iOS Safari to clear a bottom bar that position: fixed elements were assumed to sit behind. On iPhone Safari fixed elements already stop above the bar, and 100vh is the large viewport with the bar collapsed while --app-height is the visual viewport with it expanded, so the expression measures the bar's collapsible height and shows up as an empty band between the toolbar and the bar whenever the bar is expanded. The terminal was padded by the same amount.
The lift is now --chrome-overlap, set in updateAppHeight() as innerHeight minus the visual viewport height: the distance the layout viewport that anchors fixed elements extends past the visible area. That is 0 on iPhone Safari, so the toolbar meets the bar, and it is the overlap itself on any browser where fixed elements really do land behind the chrome, so those keep the lift. The keyboard-visible rules, which already override the toolbar offset, are unchanged.
