Four families, each a ladder of three: a pale tint, the color, and its deep. Butter runs Custard to Toffee, Pink runs Blush to Raspberry, Lilac runs Haze to Violet, Blue runs Ice to Navy. Paper is the one white and Plum the one ink outside the families.
Roughly how much of each color appears across a piece. Paper carries most of the weight, the pastels take turns as the surface color, Plum is every word, and Blue appears about once per piece.
Pairs live inside one family, and the value gap does the work: tint ground with the deep on it, deep ground with the tint or the color on it. Hue never changes within a surface, so nothing can clash, and the families take turns across a piece. Plum on Paper stays the reading pair.
Combinations to avoid: pairs that cross families, and rungs that sit too close on the same ladder. If the hues differ or the values nearly match, it is not a Gleam pair.
Each mode suits a medium. RGB gives the brightest Butter and Blue on screen, where this brand lives; CMYK covers everyday printing and will soften them a little, which is expected and fine.