fix(scss): limit --zh-font-family to only simplified Chinese

Author: tats-u

assets/scss/variables.scss

@@ -43,8 +43,13 @@ $defaultTagColors: #fff, #fff, #fff, #fff, #fff;
     --sys-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Droid Sans", "Helvetica Neue";
     --zh-font-family: "PingFang SC", "Hiragino Sans GB", "Droid Sans Fallback", "Microsoft YaHei";
 
-    --base-font-family: "Lato", var(--sys-font-family), var(--zh-font-family), sans-serif;
-    --code-font-family: Menlo, Monaco, Consolas, "Courier New", var(--zh-font-family), monospace;
+    --base-font-family: "Lato", var(--sys-font-family), sans-serif;
+    --code-font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
+}
+
+:root:where(:lang(zh):not(:is(:lang(zh-Hant), :lang(zh-TW), :lang(zh-HK), :lang(zh-MO)))) {
+    --base-font-family: "Lato", var(--sys-font-family), var(--zh-font-family, ""), sans-serif;
+    --code-font-family: Menlo, Monaco, Consolas, "Courier New", var(--zh-font-family, ""), monospace;
 }
 
 /*