At least in the web, I know that you should have one or very few CSS stylesheets, to better control the style across different pages and all.
That only true for the final build, not for the development environmental.
It is much better to have small files with good names that target only small sections or modules. It's easier to browse, easier to understand and to manage even. Then, of course, they should be "compiled" to one file only because that's HTTP1 optimization.
In fact, modern JS frameworks also encourage this approach, like Components in React.
I don't know about other languages, though.
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That only true for the final build, not for the development environmental.
It is much better to have small files with good names that target only small sections or modules. It's easier to browse, easier to understand and to manage even. Then, of course, they should be "compiled" to one file only because that's HTTP1 optimization.
In fact, modern JS frameworks also encourage this approach, like Components in React.
I don't know about other languages, though.