How to use different CJK font weight in different elements but not affect the latin characters?

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4

It depends on whether the font of the heading or strong is the same as the main text. Bluss gives the latter case, and here’s the former case.

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#set page(width: auto, height: auto, margin: 1em)

#set text(
  lang: "zh",
  font: (
    (name: "Libertinus Serif", covers: "latin-in-cjk"),
    "Noto Serif CJK SC",
  ),
  top-edge: "ascender",
  bottom-edge: "descender",
)

#show strong: set text(font: (
  (name: "Libertinus Serif", covers: "latin-in-cjk"),
  "Noto Sans CJK SC",
))
#show strong: it => {
  show regex("\p{Han}"): set text(weight: 100)
  it
}


= Heading 标题

text正文*强调 strong*

#set strong(delta: 0)
*strong 强调*

Besides, I recommend replace show-func with show-set whenever possible, especially for template authors.
The reason is that show-func rules are hard to override. See Which show rule takes precedence? for explanation.

Maybe you could install SourceHanSans-Regular alone (without other weights)…

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