Industrial palette
Opal Fen
From #004650 ink through #007080, #308b9b, #5298a6 to #6eb5c3 light, Opal Fen is a analogous progression that holds together at any size. Use it for national-park posters with layered mountain silhouettes. The darkest and lightest stops clear AA as a text pair.
cyanindustrialfive-stophigh-contrast
#004650
#007080
#308b9b
#5298a6
#6eb5c3
The generator opens with #004650 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.