Desktop (>1080px): the sidebar is a sticky column; the bottom bar is hidden.

Phone (≤1080px): the sidebar leaves the grid and becomes an off-canvas drawer opened by the burger or by pressing Space on the focused toggle; the bottom bar appears with four labelled slots around the raised centre button, and the main column reserves room for it including the iOS home-indicator strip.

Narrow phone (≤560px): the bar keeps the icons and drops the labels.