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

Design policy: An architectural, Swiss-style monochrome built on a base of deep navy (#283249), assembled with white and achromatic grays. Straight-edged rectangles with no rounded corners (radius 0) and the negative space of the photo grid quietly assert the brand's avant-gardism. The only accent color is the single point of yellow (#fbc02d) on the "Limited" badge - Density: Information density is low to medium. Product photography (gray-surface #e5e5e5 placeholders) takes the lead role, while text is kept small and concise. Functional e-commerce information (prices, labels) is neatly consoli