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

Design policy: Corporate and solid. Expresses the trustworthiness and reliability of the world's largest tire manufacturer through simple structure and restrained use of color - Density: Generous whitespace and large hero visuals. A layout that enhances the presence of tires and mobility products - Keywords: Solid, structural, flat, grayscale, trust - Characteristics: - Full use of the custom web font BridgestoneTypeTP-Regular. Unifies corporate identity at the typeface level - Yu Gothic (YuGothic) placed as the top-priority fallback — choosing Yu Gothic rather than Meiryo is intended to conve