Kavish1012/VibroX ? reverse-engineered prompt

Build me a clean modern music player website in a single HTML file.

I want it to feel smooth and easy to use, with a nice visual design, a playlist, basic playback controls like play, pause, skip, volume, and a progress bar. It should also support sleep audio or relaxing audio playback, since this project seems to be focused on that kind of experience. Make it responsive so it looks good on phone and desktop, and keep the whole thing simple enough that I can open it directly in a browser and use it right away.

Please make it polished, with a pleasant dark themed style, subtle animations, and clear labels so it’s easy for anyone to understand. If you need to look up anything current online, go ahead.