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

Design policy: Functional, practical, e-commerce-focused design. A white base with the Nitori teal #009e96 accent to convey trust and cleanliness. An information-dense layout stripped of ornamentation, driving product search and purchase along the shortest path - Density: High information density. A typical large-scale e-commerce site packed with category navigation, product grids, and feature banners. Body line-height is a standard 1.6 - Keywords: Functional, trustworthy, e-commerce-focused, information-dense, value-oriented - Characteristics: - The brand color is #009e96 (teal green). Used f