System

Layout. Page width, gutters, and the header's reserved band.

Widths

Four widths, nested. --containeris a retune of a registry token; the other three are this site's own.

WidthTokenValueNote
Page--container960pxChrome and rules: the header, the footer, and the widest a section may run. The registry sets this to 1540px for a docs layout with a sidebar; at that width a single column of prose reads as a banner.Registry ships 1540px
Content--container-narrow800pxThe default column for a content section inside the page width.
Prose--max-width-md384pxRunning text. Narrow enough to hold a comfortable line length without setting a character measure.
Panel--max-width-sm320pxA form column or a narrow card.

Gutters and Chrome

The space outside the column, and the band the fixed header reserves at the top of every page.

TokenValueNote
--spacing-gutter32pxThe page's side inset at desktop widths.
--spacing-gutter-snug24pxThe tighter inset, for a section that should sit closer to the edge than the page does.
--header-h80pxThe height the fixed header occupies. Anything that must clear the header offsets by this rather than by a number.
--spacing-chrome-bleed16pxHow far a full-bleed element may run past the gutter. A retune: the registry ships 0, and this site widens it at larger viewports.