MARUGAME SEIMEN Style Design System (DESIGN.md, Japanese UI)

Design policy: Compose entirely in Mincho typefaces on an unbleached ground (#fbf7ef). The design transfers the texture of an udon shop's signboard and noren curtain directly to the Web, and Gothic typefaces appear only in 10px annotations - Density: Relaxed. Body text 16px, copy line-height 2.0–2.3. Container widths in three tiers: 1200 / 960 / 880px - Keywords: Mincho, vertical writing, solid setting (beta-gumi), unbleached, single weight