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

Design approach: A monochrome editorial style built on a white ground (#ffffff). A center-aligned serif (Mincho) wordmark, generous whitespace, and a quiet layout that lets the products take center stage. A gallery/magazine-like presence. - Density: Body line-height is a roomy 1.8. Headings build hierarchy through size differences rather than weight (every element is weight 400 = regular-based). - Keywords: minimal, monochrome, Mincho editorial, quiet, product-first - Characteristics: - Uses the web font Noto Serif JP (Mincho) for Japanese text. Both headings and body are set in Mincho, creati