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

Design philosophy: A B2B/B2C corporate design built on deep navy blue #0d2ea1, organizing product information with clear contrast between white backgrounds and gray surfaces. Prioritizes information accessibility over decoration - Density: Body text at 14px / line-height 1.7, compactly fitting information-heavy pages such as product specs and category lists. Headings are tightly set at 28px / line-height 1.22, making section breaks clear - Keywords: deep navy, corporate trust, Yu Gothic, information organization, sharp angular UI, the approachability of "at your side" - Characteristics: - The