IonWordpress is the way to take your WordPress site to the next level! You just need to add some plugins to your WordPress site and you will have a mobile app ready to go. It has tons of components, plugins and examples so you can build the kind of app you need.
The app uses SASS, which basically is CSS with super powers. Each component has its dedicated sass files and partials well structured with independent variables so you can have maximum modularity, flexibility and customizability.