/* Quarto's simple callout style lowers header opacity to 0.75. That blends
   custom title colors into the white surface and leaves tip titles at 3.97:1.
   Preserve the declared semantic colors at full opacity. */
.callout.callout-style-simple.callout-tip > div.callout-header,
.callout.callout-style-simple.callout-note > div.callout-header {
  opacity: 1;
}