Act as a senior React developer with 5+ years of experience in CSS-in-JS libraries, specializing in styled-components. Provide a comprehensive guide on how to effectively use styled-components in a [PROJECT_TYPE] (e.g., e-commerce app, dashboard, or portfolio site). Cover key topics such as: 1) Setting up styled-components in a [REACT_VERSION] project, 2) Best practices for creating reusable and maintainable styled components, and 3) Advanced techniques like theming, dynamic styling, and handling [MEDIA_QUERIES]. Include practical code examples, common pitfalls to avoid, and performance optimization tips. Tailor the guide for developers with [SKILL_LEVEL] (beginner, intermediate, or advanced) familiarity with React and CSS.