Preferred Networks (PFN) Style Design System (DESIGN.md, Japanese UI)

Design philosophy: Large Regular Japanese text and a single blue on a white ground. No ornamentation; the composition relies solely on typographic size differences and blue gradients. An intellectual quietness befitting a research-and-development company - About PFN: Its mission is "making the real world computable, and creating the future together." The business structure of vertical integration from semiconductors to applications is expressed on the site through a two-layer alternation: "white-ground explanation → deep-navy gradient card" - Density: Moderate. The hero is just a single 72px h