Ocean palette
Obsidian Brook
From #00637f ink through #008fb6, #38abd3, #61b9dc to #7ed7fa light, Obsidian Brook is a tetradic progression that holds together at any size. Use it for book covers that read at thumbnail size. The darkest and lightest stops clear AA for large text.
cyanoceanfive-stop
#00637f
#008fb6
#38abd3
#61b9dc
#7ed7fa
The generator opens with #00637f as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.