Draft a co-marketing partnership proposal for a brand I want to collaborate with.

**Our brand:** [name, product/service, audience, positioning]
**Their brand:** [name, product/service, audience, positioning — what you know about them]

**The audience overlap:** [Who benefits from both brands? Be specific — demographics, interests, purchase behavior]

**Proposed collaboration:** [Choose one or combine:
- Co-branded content series (how many pieces, what platforms, what format)
- Joint webinar or live event
- Shared email campaign (each brand emails their list about the collaboration)
- Product bundle or cross-promotion
- Affiliate/referral arrangement]

**The value exchange:**
- What WE bring: [audience size, content capability, distribution channels, brand credibility in X area]
- What THEY bring: [audience size, expertise, distribution, credibility in Y area]

**Proposed timeline:** [campaign dates, key milestones]

**Success metrics:** [What "worked" looks like for both sides — traffic, email signups, sales, awareness]

**Budget/resource commitment:** [What each side invests — content creation, ad spend, team time]

**Structure this proposal in a format I can send directly to their marketing team.** Professional, concise, evidence-based. Open with the insight about shared audience, not with flattery about their brand. The proposal should make the business case so clear that the person receiving it can forward it to their boss with "I think we should do this."