Is it best practices to split an index file into three files for html, css and JavaScript?

It depends a little bit on what kind of set up you're working in but generally I would split those out into individual files, yes.

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I don't think Astro supports it but I may be 100% wrong bc I hardly know what I'm doing

In astro you usually have components, a css, and little to no js files.

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Yep, I'm back to my 800 line index file

I do have an api.js file, but it is no longer working after my morning mayhem, so I may do it the right way now

What are you building? Are you using any sort of guide or are you just tinkering to see what works?

Very cool. What's the client going to do?

I'm building a Farcaster client

It's my first coding project 

I've got some *limited* Figma skills, but I'm just going straight into html and CSS on this one