4
8
12
16
20
24
32
40
48
56
Side padding 16px (24px from 1024). Header 116px on phones, 106px from 1024. Bottom tab bar 70px + safe area. Sections 24px apart (32 from 1024); cards 16px apart; card padding 16, inner gap 12. Card grids 2-up desktop, 1-up mobile.