Opera palette
Herbal Brook
From #005477 ink through #007eb0, #349acd, #59a8d5 to #76c5f3 light, Herbal Brook is a tetradic 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
#005477
#007eb0
#349acd
#59a8d5
#76c5f3
The generator opens with #005477 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.