/* ============================================================ SG SQUARE UI v2 — Toss-inspired restyle (2026-08-19) v1 = style.css. 플래그: 쿠키 fm_ui=v2 (?ui=v2 / ?ui=v1). middleware/uiVersion.js 설계: docs/superpowers/specs/2026-08-19-ui-v2-toss-restyle-design.md 규칙: 뷰 인라인