Is it possible within a single blog to let non signed in viewers read only one category and to be obliged to sign in to read the other categories?
Absolutely. The easiest way (which may or may not be directly applicable to what you need to do) is to include the restricted categories in a loop that’s nested in the is_user_logged_in function.
There are various plug-ins that will do this as well, more or less.
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*May or may not contain any actual "CSS" or "Tricks".