:root{
  /* Motion: short, linear-ish, no bounce. */
  --ease-standard:cubic-bezier(.2,0,.2,1); /* @kind other */
  --ease-out:cubic-bezier(0,0,.2,1); /* @kind other */
  --duration-fast:120ms; /* @kind other */
  --duration-base:180ms; /* @kind other */
  --duration-slow:320ms; /* @kind other */
}