Opera palette
Birch Brook
From #004873 ink through #0070b0, #308ccd, #539bd3 to #6fb7f1 light, Birch Brook is a split-complementary progression that holds together at any size. Use it for hotel key cards and lobby signage in one system. The darkest and lightest stops clear AA for large text.
skyoperafive-stop
#004873
#0070b0
#308ccd
#539bd3
#6fb7f1
The generator opens with #004873 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.