Reset som Hugo Zen changes from Drupal Zen.

sass/navigation/more-link/_more-link.scss

@@ -1,10 +1,6 @@
 // "More" link
 //
-// Styles the "Read more…" and "Help" links common in Drupal.
-//
-// Markup: more-link.twig
-//
-// Style guide: navigation.more-link
+// Styles the "Read more…" and "Help" links common on the web.
 
 .more-link,
 %more-link {
@@ -26,15 +22,3 @@
     }
   }
 }
-
-//
-// Drupal selectors.
-//
-
-.more-help-link {
-  @extend %more-link;
-
-  a {
-    @extend %more-link__help-icon;
-  }
-}

sass/navigation/navbar/_navbar.scss

@@ -29,21 +29,3 @@
     }
   }
 }
-
-//
-// Drupal selectors.
-//
-
-.main-navigation {
-  // Hide the block titles put into the main-navigation area of the page.tpl.php.
-  .block-menu .block__title,
-  .block-menu-block .block__title {
-    @extend %visually-hidden;
-  }
-
-  // Main menu and secondary menu links and menu block links.
-  .links,
-  .menu {
-    @extend %navbar;
-  }
-}

sass/navigation/pager/_pager.scss

@@ -27,7 +27,7 @@
 }
 
 //
-// Drupal selectors.
+// Zen selectors.
 //
 
 // .pager-item     - A list item containing a page number in the list of pages.