·Top bar: context switcher, language, account. Navigation: side on lg and up, bottom on phones with up to five items.
·Page: title block (heading1, description, one primary action), sections separated by space 8, sticky action bar on long forms.
·Gutters: space 4 on phones, space 6 on tablets, space 8 on desktop. Content capped at the container sizes.
·Reading order equals visual order; the navigation has a skip link; 200 % zoom keeps every control reachable.