I don’t know why bold weight works so badly with Chinese characters, to the point where complex ones can become hardly readable... I realised recently that I needed to use another font rather than change the font weight of the words I’m studying.
Here is an example of an Anki card with highlighted words in bold (using font-weight: bold in css) VS using a bold font (in this case, Google Font Noto Sans Simplified Chinese bold).
#Anki

