Suggested base / primary / accent combinations derived from your seed. When your seed is a foreground, the base is its low-chroma echo; when your seed is a neutral, the primary is a hue-rotated, chroma-pumped complement. Each card has its own copy buttons for the full scheme (seed palette + roles).
A syntax highlighting scheme derived from your seed: base + primary + four tetradic accents. Tokens share one palette step so no color visually jumps. Comments use a muted base step; keywords/strings/numbers/functions/types take the accents.