What functionality does the Style System offer in AEM?

The Style System in AEM is specifically designed to provide authors with the ability to create reusable design elements. This functionality allows users to define a set of styles that can be applied across different components and pages, ensuring consistency in design and improving efficiency in content creation. By enabling the creation of these styles, authors can easily implement branding or layout changes without needing to delve into code or customize each component individually, enhancing the overall editing experience and streamlining the design process.

The other options highlight useful functions commonly found in content management systems, but they do not align with the primary purpose of the Style System. While a graphical interface for page layout might enhance the building of a page, that is not a core feature of the Style System. Similarly, managing SEO properties and generating reports on content performance are functionalities associated with content management and analytics rather than the specific aim of creating reusable design elements.