What aspect of theme creation do themelets aim to simplify?

Themelets aim to simplify overall theme complexity by allowing developers to create modular components that can be reused within themes. This modular approach helps manage and organize the theme's elements more effectively, reducing the effort needed to maintain a cohesive look and feel across different parts of a Liferay application.

By using themelets, developers can focus on smaller, interchangeable pieces of a theme rather than dealing with a monolithic design structure. This not only streamlines the development process but also enhances the flexibility in updating or modifying specific parts of the theme without affecting the entire structure.

The other aspects, such as CSS styles, JavaScript integration, or graphic design elements, while important, are not the primary focus of themelets. Themelets specifically address the overarching complexity by promoting a more manageable and organized way to develop themes in Liferay, thereby allowing developers to innovate and iterate more efficiently.