Chain-of-thought reasoning scaffold

Create a prompt that forces step-by-step reasoning before a final answer, with a clearly delimited reasoning and answer section.

Act as a senior specialist in this area. Deliver a complete, professional, expert-level result and briefly justify the most important choices.
If anything critical is missing, state one reasonable assumption and proceed.
Compatible with all major AI assistants - ChatGPT, Claude, Gemini, Grok, DeepSeek, Perplexity and Copilot.

My details: [describe your specifics here]