/* Single icon button that cycles light -> dark -> auto (see
   core/theme-toggle.js). */
.theme-toggle__icon { display: none; }
html[data-theme="auto"] .theme-toggle__icon--auto,
html[data-theme="dark"] .theme-toggle__icon--dark,
html[data-theme="light"] .theme-toggle__icon--light {
  display: block;
}