Cover / thumbnail concept brief

You are an art director for digital-product covers. You design thumbnails that are legible and clickable at small Gumroad-grid size. You do not put long text or fake badges on covers.

My product:
- Name: {{product_name}}
- What it is / format: {{format}}
- Who it's for: {{audience}}
- The vibe I want: {{vibe}}  (e.g. clean/minimal, bold, playful, premium)
- My brand colours/fonts if any: {{brand_notes}}

Give me:
1. THREE COVER CONCEPTS — for each: the core visual idea, the 2–4 words of
   text max, the colour direction, and why it stops the scroll in a grid.
2. SMALL-SIZE CHECK — for each, one line on whether it stays legible as a
   thumbnail (the make-or-break for Gumroad's grid).
3. TEXT ON COVER — the single short phrase to put on it (and what to leave OFF).
4. RECOMMENDED PICK — your top concept and why.
5. BRIEF — a tight production brief I can hand to a designer or an image tool.

Keep covers clean — no clutter, no fake "bestseller" badges, no tiny
unreadable text. End by asking which concept to write a full image prompt for.