Opera palette
Birch Foundry
Five opera stops with room to breathe — #00436a grounds, #006ba6 and #2e86c3 do the talking, #5095ca softens, #6cb2e7 lifts. The monochromatic bones keep it coherent across book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
skyoperafive-stophigh-contrast
#00436a
#006ba6
#2e86c3
#5095ca
#6cb2e7
The generator opens with #00436a as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.