Exercise 3: Why No Preprocessing Is Needed Here — Possible Solution
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WHY THE DARK THEME CSS NEEDS NOTHING MORE THAN PROPSHAFT'S DEFAULT BEHAVIOR
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Per this chapter, app/assets/stylesheets/application.css holds this site's own dark theme written as plain CSS, with no Sass variables, nesting, or other preprocessor-only features used. Since Propshaft's entire job is fingerprinting a static file and serving it, and the file is already valid, final CSS with nothing left to compile, Propshaft's default fingerprint-and-serve behavior is already the complete pipeline this file needs - there's no compilation step being skipped or deferred, because none was ever required.

WHY THIS WORKS AS AN ANSWER
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It correctly explains that the dark theme stylesheet is already plain, final CSS with no preprocessor features in use, and correctly connects that fact to why Propshaft's minimal fingerprint-and-serve behavior is sufficient on its own, with no additional preprocessing tool needed.