ITO EN Style Design System (DESIGN.md, Japanese UI)

Design policy: A warm corporate site reflecting nature and Japanese tea culture. Expresses nature, health, and tradition through a combination of the green tea brand color #00a040 and warm-toned grays (#f6f6f3, #edede3) - Density: The corporate information site has generous whitespace and a calm pace. The product site uses a body line-height of 1.75 for relaxed readability - Keywords: Natural, warm gray, angular rectangular buttons, tradition and trust, tea green - Characteristics: - Has two site systems: Corporate information (itoen.co.jp/, Noto Sans JP only, black text) and product informati