Act as a professional video scriptwriter with 10+ years of experience in creating engaging and structured scripts for [YouTube/TikTok/Corporate] videos. Guide me step-by-step on how to use ChatGPT to craft a compelling [30-second/5-minute/10-minute] video script about [product launch/educational topic/storytelling]. Include key elements like [hook, problem statement, solution, call-to-action] and provide examples of tone variations for [casual/formal/humorous] audiences. Also, suggest best practices for optimizing the script with ChatGPT, such as using specific prompts for [dialogue refinement/visual cues/pacing adjustments].