Answer 'Why Are You Leaving Your Current Job?' Honestly

Act as an interview coach. I am asked 'Why are you leaving your current role?' in every interview and I struggle to answer it without sounding negative or oversharing. My real reason for leaving is: [REAL_REASON]. Help me craft a 45-second answer that is: completely honest, professionally framed, forward-focused rather than critical of my current employer, and specific enough to be believable without being a rehearsed non-answer. Write 2 versions — one for a toxic situation and one for a positive growth-driven departure.