[Misc] improve web section group title display

Signed-off-by: reidliu41 <[email protected]>

Author: reidliu41

docs/mkdocs/stylesheets/extra.css

@@ -22,3 +22,15 @@ a:not(:has(svg)):not(.md-icon) {
         display: inline-block;
     }
 }
+
+/* Light mode: darker section titles */
+body[data-md-color-scheme="default"] .md-nav__item--section > label.md-nav__link .md-ellipsis {
+  color: black !important;
+  font-weight: bold;
+}
+
+/* Dark mode: lighter gray section titles */
+body[data-md-color-scheme="slate"] .md-nav__item--section > label.md-nav__link .md-ellipsis {
+  color: white !important;
+  font-weight: bold;
+}