±0 (Plus Minus Zero) Style Design System (DESIGN.md, Japanese UI)

Design policy: A thoroughly neutral e-commerce catalog that lines up product photos plainly against a simple gray background. A design stripped of decoration, translating Naoto Fukasawa's philosophy of "this is affordance" into web layout - Density: The product grid is medium density. Each card carries only "product name / price / color variations," thoroughly eliminating noise - Keywords: neutral, gray, affordance, thin, restrained, product photos as the star - Characteristics: A WordPress (block editor) based site. The brand accent is solely #0999d8 (bright light blue), used only for the CTA