Cool slate paper, ink hierarchy, restrained slate-blue accent, Japanese serif + Source Code Pro numerals. The tokens and primitives below are the only building blocks the app should use — anything not documented here is a candidate for extraction.
Body copy sits in Noto Sans JP. Use for paragraphs, hints, and anything that isn't a number or a heading.
Secondary ink color for subordinate copy.
primary variant is reserved for one hero action per screen. Hover transitions to a fill; press nudges 1px down.highlighted persists hover wash for keyboard-navigated lists. Wrap in a Card padding="sm" elevation="overlay" when floating above body cards.currentColor, so wrap in a span with the desired ink token to retint.