Sumi palette
Terracotta Gallery
Five stops tuned to sit together without fighting — #7e0200 ink anchors the set, #f28b7b opens it up, and #ad3b2e, #cc5748, #d36f60 cross the middle in a tetradic arrangement. Terracotta Gallery suits book covers that read at thumbnail size. The darkest and lightest stops clear AA as a text pair.
redsumifive-stophigh-contrast
#7e0200
#ad3b2e
#cc5748
#d36f60
#f28b7b
The generator opens with #7e0200 as the primary and the next two stops as secondary and accent — adjust, check contrast, and export tokens or CSS from there.