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

Design philosophy: An anti-decoration ultra-minimal approach that layers extremely small typography (10px base) onto a strict monochrome of pure black and pure white. Images dominate the entire surface, and the UI disappears to the limit - Density: Information density is low. Full-width hero images and collection photography take the lead, with text serving a caption-like role - Keywords: ultra-minimal, monochrome, anti-decoration, 10px base, global palt, HelveticaNeueLTPro, editorial, brutalist typography - Characteristics: - A fully binary color palette — only #000000 and #ffffff. No accent