:root{
  --ease:cubic-bezier(.2,0,.2,1); /* @kind other */
  --dur-fast:.2s; /* @kind other */
  --dur-base:.3s; /* @kind other */
  /* Motion is limited to colour/opacity/underline-reveal. No transforms on content, no bounce. */
  --transition-link:color var(--dur-fast) var(--ease);
  --transition-rule:transform var(--dur-base) var(--ease);
  --transition-border:border-color var(--dur-base) var(--ease);
}