:root {
  /* 8px base. 4/12/17 exist for typographic adjustment; structure snaps to 8/24/32/48/80. */
  --sp-xxs: 4px;
  --sp-xs: 8px;
  --sp-sm: 12px;
  --sp-md: 17px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-xxl: 48px;
  --sp-section: 80px;
  --sp-section-tight: 48px;

  --gutter: 24px;
  --page-margin: 32px;
  --measure-text: 720px;
  --measure-prose: 980px;
  --measure-grid: 1440px;
}