Nulab Style Design System (DESIGN.md, Japanese UI)

Design policy: Large, pale tinted surfaces on a white ground. High-saturation colors are confined to CTAs and logos only, and surfaces are always dropped to pastels with a lightness of 95% or higher. "Lively, but not noisy" is achieved through color design - About Nulab: The mission is "Creating 'I'm glad I got to work with this team' all over the world." The difficult problem of having four products, each with its own brand color, is solved by the division of labor: "deep colors for logos, pale colors for surfaces" - Density: Medium density. The top page runs full-width KV (illustration) → ve