GC Minimal Zine Poster is a Codex skill for turning a theme, sentence, object, mood, article idea, photograph, or creative brief into a minimal editorial poster. It translates the input into a sparse vertical composition with an aged-paper appearance and extensive negative space. The visual system favors one small subject, restrained typography, and a single high-chroma color accent. Texture treatments can imitate xerox copies, risograph printing, halftones, letterpress, and scanned-paper imperfections. The skill intentionally avoids glossy advertising, cinematic lighting, 3D rendering, neon effects, and crowded scrapbook layouts. ...