Looking for a word processing software where it’s much easier to set up your styles. There are several modes.
Design mode let you set style properties. You can change font size with slider, edit html code, edit style name. You have many ways of selecting colors. You can set style shortcuts. You can save design to use on other documents.
Content mode ignores what paper you write on. It is only intended to show the content. This mode has little layout to remove distractions. You can however easily move between other documents.
When you are finished writing, you can adjust the content so that it flows correctly. Don’t know if it make sense to have it’s own mode for this.
Have a look at https://www.lyx.org/ for inspiration. It is a content editor with LaTeX for doing the styling and rendering. It is quite complicated and you need to learn some LaTeX if you want to use it to full potential. But if you have to write a research doc or a thesis there is no better tool IMHO.
This looks very promising!