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* **Code Quality:** Simple, functional JavaScript; lacks error handling and robust theme management. * **Language Use:** Basic JavaScript features; inefficient theme toggling; missing `const`/`let`. * **Structure:** Minimal structure; functions are globally scoped; unclear `checkBox` variable origin. * **Improvements:** Use `const`/`let`; add error handling; encapsulate theme logic; use a dedicated theme management library or CSS variables directly in CSS instead of JS. Consider using a more structured approach like a class or module to organize the code better and avoid global variables. * **Security:** High number of critical security issues reported, needs immediate attention. Investigate and remediate vulnerabilities. * **Maintainability:** Low maintainability due to lack of structure, error handling and testing. Improve code quality to address these issues.