Blue Hour palette
Denim Abbey
Five stops tuned to sit together without fighting — #005188 ink anchors the set, #81c2ff opens it up, and #007ac8, #3396e6, #58a6eb cross the middle in a tetradic arrangement. Denim Abbey suits book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#005188
#007ac8
#3396e6
#58a6eb
#81c2ff
The generator opens with #005188 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.