Storm palette
Emerald Ridge
Dark anchor, working middle, light release: #004656, #007088, #308ba4, #5299ae, #6eb5cb form a tetradic storm set with somewhere to stand at every lightness. Made for book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
cyanstormfive-stophigh-contrast
#004656
#007088
#308ba4
#5299ae
#6eb5cb
The generator opens with #004656 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.