Centered content wrapper with xsmall, small, default, large, and expand width modifiers for consistent page rhythm.

Vertical spacing sections with default, small, large, and xlarge padding plus muted, primary, and secondary style modifiers.

Responsive column grid with gutter control, nesting, match-height, and masonry layout via pure CSS classes.

Fractional and fixed-width utility classes — 1/2, 1/3, 2/5, auto, expand — responsive per breakpoint.