The text is a comprehensive guide to CSS refactoring, aimed at improving the readability, maintainability, and performance of CSS code. It highlights the importance of refactoring in enhancing website performance, given that poorly structured CSS can degrade user experience by increasing load times, reducing mobile responsiveness, and causing poor visual stability. The guide covers best practices such as using CSS preprocessors, adopting a mobile-first design approach, and employing tools like PostCSS for optimization. It emphasizes the need for organized CSS structures, removal of unused code, and the use of version control to track changes, while also discussing the role of browser-specific prefixes and testing in ensuring compatibility and performance across different devices. Additionally, the guide addresses common pitfalls and provides solutions to avoid redundant or inefficient code, offering insights for both novice and experienced developers to enhance their CSS skills.