NTT Group Style Design System (DESIGN.md, Japanese UI)

Design policy: A trustworthy corporate design with a white background and NTT Blue as an accent. A clean structure that balances the formality of a major telecommunications group with technological sophistication - Density: Medium information density. A portal-style layout with news, IR information, and group company introductions arranged in an orderly manner - Keywords: Trust, clean, corporate blue, structural, formal