The page grid, the page’s widths, spacing, and the pieces that place things on them.
Pages sit on fluid columns: 4 on phones, 8 from 768px, and 12 from 1200px of the page’s own width.
The page’s width: the margins for its size class, a maximum width, and centering past it.
The page’s columns as a component: each item covers whole columns at each size class.
Pieces in a column or a row, on the spacing grid.
Equal columns that wrap to fewer as the room narrows.
Retained for design review. No consumer screen uses this component.
Two regions side by side: a main column and a side column a third as wide, 40px apart on web, such as an activity’s details with its dates.
The overview card.
The commute map.
Space by purpose: inside a container, inside a group, between sections, between columns, and at the page’s edge.
Four levels from the page up, each one material, so depth reads the same everywhere.