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

Design policy: A refreshing brand site centered on Calpis Blue. With Calpis Blue accents on a white background, it expresses the freshness of a lactic acid bacteria beverage and 100 years of tradition. A lightweight implementation using system fonts only - Density: A spacious layout centered on a large hero carousel and product photos. Body text at line-height: 1.5 for standard readability - Keywords: Refreshing, Calpis Blue, polka-dot pattern, white and blue, traditional brand, system fonts - Characteristics: Calpis Blue #0033ff is used for CTAs, and Medium Blue #0053c5 for product titles and