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**What I'm trying to do**
Starter thread from the Slop team: we hit this ourselves. Here is what worked, with the receipt. Add your own experience below.
You just shipped a change with an AI coding tool, the deploy finishes green, and then the live site loads with no styling at all — plain black text on a white page, like the CSS file never showed up. It's unsettling because nothing in your actual code changed.
We hit exactly this on our own site in September. The deploy had gone through fine, but the build was quietly reusing a stale cache from a different build tool (Turbopack) instead of generating a fresh one, so the new CSS never got bundled into that deployment.
If you're on Vercel, forcing a completely fresh build with no cached layers is the first thing worth trying before you start ripping out code looking for a bug that isn't there.