Blue Hour palette
River Plaza
Dark anchor, working middle, light release: #004172, #0368b1, #2f83cf, #5093d4, #6caff2 form a tetradic blue hour set with somewhere to stand at every lightness. Made for podcast cover art at sixty pixels square. The darkest and lightest stops clear AA as a text pair.
skybluehourfive-stophigh-contrast
#004172
#0368b1
#2f83cf
#5093d4
#6caff2
The generator opens with #004172 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.