.word-quality {
  --word-surprisal: 0;
  display: inline-block;
  padding: 0.08rem 0.14rem;
  border-bottom: calc(1px + 5px * var(--word-surprisal)) solid
    color-mix(
      in srgb,
      var(--rd-accent, #7c9cff) calc(25% + 70% * var(--word-surprisal)),
      transparent
    );
  cursor: help;
}