:root{
  /* no blurred shadows anywhere. edges only. light from directly above. */
  --edge-raised:inset 0 1px 0 rgba(255,255,255,.55), inset 0 -1px 0 rgba(0,0,0,.20); /* @kind shadow */
  --edge-raised-dk:inset 0 1px 0 rgba(255,255,255,.10), inset 0 -1px 0 rgba(0,0,0,.55); /* @kind shadow */
  --edge-recessed:inset 0 1px 2px rgba(0,0,0,.38), inset 0 -1px 0 rgba(255,255,255,.42); /* @kind shadow */
  --edge-recessed-dk:inset 0 2px 3px rgba(0,0,0,.70), inset 0 -1px 0 rgba(255,255,255,.07); /* @kind shadow */

  --glow-rec:0 0 6px rgba(217,47,34,.8);
  --glow-arm:0 0 6px rgba(240,125,18,.7);
  --glow-ok:0 0 6px rgba(55,163,64,.7);
  --glow-link:0 0 6px rgba(31,95,208,.7);
}