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

Design policy: A clean light-theme foundation (#ffffff / #f5f5f5 backgrounds + dark text), emphasizing functionality and trustworthiness as a sports equipment e-commerce site. Uses the brand color Mizuno Blue (#001489) as an accent, with a visual-driven layout that puts product imagery front and center - Density: The top page is high-density with a hero banner plus category grid. Product listings use a regular card grid. The footer is dark (#111111) with light text (#f5f5f5) - Keywords: sports, functional, light & clean, dark CTA, grid e-commerce - Characteristics: - Uses Roboto (Latin) + Hira