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.
The great thing about Markdown is its simplicity. Focus on the actual content and keep the formatting to a minimum (other than headers, italics, bold, lists, etc) and then apply some styling afterwards through Pandoc (like how you style a whole website through CSS) during conversion. I guess you could also rely on a bit of HTML tags if you need to put some colors for emphasis that is outside what Markdown does.