:root {
  /* Borders are drawn as inset rings in the source, not CSS borders */
  --ring-card: inset 0 0 0 1px var(--ac-line-faint);
  --ring-control: inset 0 0 0 1px var(--ac-line-strong);
  --ring-hairline: inset 0 0 0 1px var(--ac-line-soft);
  --ring-editorial: inset 0 0 0 1px var(--ac-paper-rule-2);
  --ring-selected: inset 0 0 0 2px var(--ac-tl-ink);
  --ring-dark: inset 0 0 0 1px var(--ac-dark-line);

  --shadow-knob: 0px 1px 2px 0px rgba(0,0,0,0.05);
  --shadow-knob-dark: 0px 1px 4px 0px rgba(0,0,0,0.35);
  --shadow-sheet: 0px -8px 40px 0px rgba(0,0,0,0.7);
  --shadow-accent-glow: 0px 4px 24px 0px rgba(204,0,0,0.35);
}