font config

fonts.conf

.config/fontconfig/fonts.conf
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
<fontconfig>

  <!-- Default system-ui fonts -->
  <match target="pattern">
    <test name="family">
      <string>system-ui</string>
    </test>
    <edit name="family" mode="prepend" binding="strong">
      <string>sans-serif</string>
    </edit>
  </match>

  <!-- Default sans-serif fonts-->
  <match target="pattern">
    <test name="family">
      <string>sans-serif</string>
    </test>
    <edit name="family" mode="prepend" binding="strong">
      <string>PingFang SC</string>
      <string>Helvetica Neue</string>
      <string>Apple Color Emoji</string>
    </edit>
  </match>

  <!-- Default serif fonts-->
  <match target="pattern">
    <test name="family">
      <string>serif</string>
    </test>
    <edit name="family" mode="prepend" binding="strong">
      <string>Songti SC</string>
      <string>Times</string>
      <string>Apple Color Emoji</string>
    </edit>
  </match>

  <!-- Default monospace fonts-->
  <match target="pattern">
    <test name="family">
      <string>monospace</string>
    </test>
    <edit name="family" mode="prepend" binding="strong">
      <string>.SF NS Mono</string>
      <string>Fira Code</string>
      <string>PingFang SC</string>
      <string>Apple Color Emoji</string>
    </edit>
  </match>

</fontconfig>