Blue Hour palette
Thistled Estuary
Dark anchor, working middle, light release: #186597, #4c8fc1, #68abdf, #82bae7, #a4d7ff form a monochromatic blue hour set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
skybluehourfive-stop
#186597
#4c8fc1
#68abdf
#82bae7
#a4d7ff
The generator opens with #186597 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.