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

Design policy: A craft-luxury site that conveys the pride of leather artisans, composed of "Rokkitt (slab serif) + Hiragino Kaku Gothic Pro W3 + warm brown-gray." A Latin-first font stack that places Rokkitt (slab serif) at the head for Latin text and pairs it with Hiragino Kaku Gothic Pro W3 for Japanese text. A restrained color scheme with warm brown-gray text color #5b5454 on a pure white background, with no bright accent colors whatsoever. Generous letter-spacing (0.04em–0.2em) is applied throughout, expressing a quiet dignity like the patina of aged leather. - Density: An extremely spacio