/* high-contrast — accessibility-first override. Pure black/white with a
   yellow accent, no shadow, no rounded corners. */
:root[data-theme="highcontrast"] {
  --bg:        #000000;
  --fg:        #ffffff;
  --muted-fg:  #cccccc;
  --accent:    #ffff00;
  --accent-fg: #000000;
  --border:    #ffffff;
  --shadow:    none;
  --radius:    0;
}