:root{
  /* Corners are square. Radius exists only for the two places print can't reach:
     form controls and the pill-shaped filter chip. Nothing else rounds. */
  --radius-none:0;
  --radius-xs:2px;
  --radius-pill:999px;

  --border-width-hairline:1px;
  --border-width-rule:1px;
  --border-width-heavy:2px;

  --border-hair:1px solid var(--border-hairline);
  --border-hair-strong:1px solid var(--border-strong);
  --border-ink:1px solid var(--border-solid);

  /* The horizontal rule that splits the monogram, and every divider derived from it */
  --rule-hair:1px solid var(--hairline-ink);
  --rule-inset:var(--space-6);
}