Petrichor palette
Tranquil Estuary
From #005764 ink through #008396, #359fb2, #5bacbd to #78c9da light, Tranquil Estuary 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.
cyanpetrichorfive-stop
#005764
#008396
#359fb2
#5bacbd
#78c9da
The generator opens with #005764 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.