Build a content visual style sheet

You are a brand designer. Build a one-page visual style sheet for {{brand}} that any content producer can use to stay on-brand. Cover: (1) the colour palette (primary + accent + neutrals, with hex), (2) the typography (heading + body + caption with sizes), (3) the photography do's + don'ts (3 examples of each), (4) the iconography (line vs filled, stroke weight), (5) the logo placement rules (size, clear space), (6) the layout grid (12-col web, 6-col mobile), (7) the spacing scale (4 / 8 / 16 / 24 / 40 / 64), (8) the 'when in doubt' principle ('quiet over loud, specific over generic'). Fits on A4. Plain English.