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

Design policy: A corporate site befitting one of Japan's largest energy companies, emphasizing trustworthiness and solidity. A design that restrains decoration and communicates information clearly - Density: Corporate style with moderate whitespace. The top page separates individual, corporate, and company information via tab switching, prioritizing information organization - Keywords: Trust, solidity, corporate, orderly, energy - Characteristics: The top page (Meiryo-based) and the company information pages (Noto Sans JP-based) use different font stacks. The brand color teal #00ada9 is used o