Developer uses ChatGPT system prompts to build 1996 dial-up simulator

1. Apply strict negative constraints in your system prompts, such as explicitly forbidding modern CSS layout tools like Flexbox or Grid, to force retro styling.
2. Map Web Audio API nodes to specific historical frequencies using step-by-step prompts to generate authentic vintage audio.
3. Isolate CSS scopes by defining strict boundaries in your prompts to prevent retro styles from leaking into modern wrapper elements.