Karimoku Furniture (karimoku) Style Design System (DESIGN.md, Japanese UI)

Design policy: Completely flat, with not a single shadow on a white background. It also has almost no rounded corners (border-radius: 0 on 77 elements), dividing surfaces using only rules and whitespace. Furniture photography takes center stage, and the UI is kept thoroughly restrained. - Density: Whitespace is extremely generous. Section padding-top is 60 / 90 / 120px. Body text is small at 14px, with line spacing fixed at 28px. - Keywords: flat, fixed line spacing, Japanese-Western two-tier, letter spacing, shadowless