TABIO (Tabio / Socks Shop) Style Design System (DESIGN.md, Japanese UI)

Design approach: A serene, refined monochrome EC site that uses Koburina Gothic (Fontplus) throughout. It doesn't rely on color — it expresses refinement through typography and whitespace - Density: Body text 14px / line-height 1.23 / letter-spacing 0.08em. The product grid uses generous spacing to make the materiality of each individual pair of socks stand out - Keywords: Koburina Gothic, monochrome, 0.08em wide tracking, craft feel, muted gray - Characteristics: - Uses Fontplus's Koburina Gothic (KoburinaGoStdN) in two weights: W3 (Light) and W6 (Bold). A typeface selection suited to a craft