:root{
  --dur-fast:120ms; /* @kind other */
  --dur-base:220ms; /* @kind other */
  --dur-slow:420ms; /* @kind other */
  --dur-ambient:9s; /* @kind other */
  /* Calm, engineered easing. No bounce, no overshoot. */
  --ease-standard:cubic-bezier(.4,0,.2,1); /* @kind other */
  --ease-out:cubic-bezier(.16,1,.3,1); /* @kind other */
  --ease-in:cubic-bezier(.4,0,1,1); /* @kind other */
}