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

Design approach: Black-based full-bleed photography + modern sans-serif using Roboto / Noto Sans JP. The brand site's first view is a full-screen black-background key visual, composed of white knockout text and pill-shaped CTAs — a hybrid design of "outdoor gear × street fashion" - Density: Body text 16px / line-height 1.5 / letter-spacing normal. Large images, minimal text. Generous whitespace, letting the photography speak to the product's texture - Keywords: monochrome, black-dominant, pill CTA, Roboto, Noto Sans JP, outdoor, street, toughness - Characteristics: - font-feature-settings is n