If you’re still open for inspiration on this implementation of collapsible sections, I’ll reiterate my recommendation of Notion’s implementation of toggles and toggle headings in terms of both aesthetics and effect. For example, I love having the ability to make both bullet points and headings collapsible, and I love how easy they are to create (by beginning an empty line with “> text”).
If you’re still open for inspiration on this implementation of collapsible sections, I’ll reiterate my recommendation of Notion’s implementation of toggles and toggle headings in terms of both aesthetics and effect. For example, I love having the ability to make both bullet points and headings collapsible, and I love how easy they are to create (by beginning an empty line with “> text”).