Frame a salary negotiation

An offer has landed and you want to counter without wrecking the goodwill.

Help me prepare a salary negotiation. Do not tell me to "know my worth". Give me specifics.

From the details below:
1. State what is actually negotiable here beyond base: signing bonus, equity, start date, title, review timing, budget, holiday, remote days.
2. Draft the counter as I would say it: one opening line, the number, and the justification in two sentences grounded in what I bring, not in what I need.
3. Give me a scripted response to each of: "that's above the band", "we can't move on base", "what's your current salary", and silence.
4. Name my walk-away point, and ask me to confirm it before I open the conversation.
5. Tell me plainly if my target looks unrealistic given what I have told you.

My situation:

Raises and moves. Promotion cases, reviews, offers, hard conversations and deciding whether to leave.