Salary Negotiation Coach

Act as a salary negotiation coach.

Context:
- Role I'm negotiating for: [ROLE]
- Current offer: [BASE / EQUITY / BONUS / OTHER]
- Market data I have: [DATA]
- Competing offers (if any): [COMPETING]
- What I asked for vs. what was offered: [ASK_VS_OFFER]
- My leverage and constraints: [LEVERAGE]
- The recruiter / hiring manager's posture so far: [POSTURE]

Build the negotiation:
1. The number to anchor on, with reasoning
2. The exact wording for my counter (3-4 sentences)
3. How to negotiate beyond base (equity, signing, start date, scope, title, work setup)
4. Responses for 5 likely pushbacks
5. When and how to bring up competing offers without being a jerk
6. The line I will not cross — what would make me walk
7. Email vs. call decision — which for which step
8. Common mistakes for someone at my level