Yoshida Kaban / YOSHIDA & Co. (PORTER) Style Design System (DESIGN.md, Japanese UI)

Design Policy: A thoroughly artisan, catalog-like minimalism befitting a long-established bag manufacturer founded in 1935. Decoration is eliminated; the composition uses only black, white, and grayscale - Density: Extremely high information density. Body text at 12px and product thumbnail captions at 10px — among the smallest on any Japanese site. Structured with a professional buyer's catalog in mind - Keywords: Minimal, monochrome, Helvetica, artisan, catalog, high density - Characteristics: Every CTA / card / input field uses border-radius: 0px (a completely squared-off design). Colors are