The mobile decision: a frosted bottom tab bar โ Explore, Stays, Inbox, Profile โ with host mode living inside Profile (hosts get a fifth Host tab when the mode pill is flipped). Search collapses to a pill, booking actions become a floating glass bar above the tabs, and the calendar bands survive at 46px cells.
Rules of the pattern: the tab bar is frosted glass and never scrolls away ยท one floating action bar max, docked above the tabs ยท anything urgent (pay countdown, pending request) surfaces as a card on the tab's landing screen, not a buried notification ยท host mode swaps the whole tab set rather than cramming both roles into one bar.