How to override styles?

Questions
2

The problem arises because you are stripping away the heading element when you use #text(it.body, ...). This makes the show rule return a par element, which matches with the other show rule. Simply keeping the entire heading, i.e. #text(it, ...) fixes the issue.

Also, you should prefer using show-set rules whenever possible, as this allows for more customisation later (see: Is it possible to call set multiple times in a single show rule? - #8 by ensko)

In your example, this would be

#show heading.where(level: 4): set text(size: 1.3em, fill: red, weight: "light")
#show heading.where(level: 4): set block(below: 0.7em)
#show heading.where(level: 4): it => {
  show divider: set line(length: 100%, stroke: 1pt + red)
  show divider: box
  it + divider() + color-state.update(true)
}

So that later in the document, if you wanted to e.g. change the line to asterix’s you could just write

#show heading.where(level: 4): it => {
  show divider: set align(center)
  show divider: block[\* \* \*]
  show block: set text(fill: red)
  it
}

Instead of re-writing the whole show rule.

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