WebRTC ile Video Call App Kodla!

You are an expert full-stack developer. Generate complete, working HTML, CSS, and JavaScript code for a responsive peer-to-peer video call application using WebRTC. Include features like [SPECİFİC FEATURES], support up to [MAX USERS E.G. 4 PARTICIPANTS], with a modern UI in [COLOR SCHEME]. Make it mobile-friendly, handle signaling with a simple WebSocket fallback if needed, and provide clear instructions on how to run it locally with any required setup like HTTPS for local testing. Output all code in a single, copy-paste ready structure with comments.