How can I negotiate a senior role salary, perks, and non-negotiables?

[Aaron.S]

I'm a mid-level project manager who has been offered a promotion to a senior role, and I'm preparing to negotiate the salary and benefits package, but I feel completely out of my depth. I've researched the market rate for the position, but I'm unsure how to effectively present my case, handle potential pushback, and navigate the conversation beyond the initial number. For professionals who have successfully negotiated significant raises or promotions, what specific tactics and phrasing did you find most effective in framing your value and maintaining a collaborative tone? I'm also worried about discussing non-salary elements like additional vacation time or a flexible work arrangement, and how to gracefully respond if the initial offer is non-negotiable.