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

Design approach: A Japanese e-commerce site that expresses a rugged American vintage industrial atmosphere through navy blue #001a60 and bold English headings set in Arial Black - Density: A high-information-density layout with a small base font (12px) and a compact product grid, efficiently showcasing a large number of products - Keywords: industrial, American vintage, navy blue, flat & angular, bilingual headings - Characteristics: - Arial Black is used for English headings. The bold, powerful typeface creates an industrial label feel - Japanese text is based on Noto Sans JP, with Meiryo and