Blue Bottle Coffee Japan Style Design System (DESIGN.md, Japanese UI)

Design philosophy: Serene, clean, minimal. Almost every element is unified at weight 400 (Regular) — a typography that "doesn't raise its voice." The ghost button (outline only, no fill) CTA is emblematic - Density: Body text line-height 2.0, headings also 1.5–2.0 — extremely relaxed. Product listings use a grid with generous whitespace. Atmosphere is prioritized over information density - Keywords: Serene, sky blue, ghost CTA, unified weight 400, generous line spacing, coffee-house whitespace - Characteristics: - Uses AXIS Font Basic R ProN (Adobe Fonts) for Japanese text. A geometric sans-se