diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -7,10 +7,10 @@
  */
 return array(
   'names' => array(
-    'core.pkg.css' => 'ba9b6450',
+    'core.pkg.css' => '4e2c8d53',
     'core.pkg.js' => '23d653bb',
     'darkconsole.pkg.js' => '8ab24e01',
-    'differential.pkg.css' => '380f07e5',
+    'differential.pkg.css' => '14f0fa92',
     'differential.pkg.js' => '7b5a4aa4',
     'diffusion.pkg.css' => '591664fa',
     'diffusion.pkg.js' => 'bfc0737b',
@@ -41,7 +41,7 @@
     'rsrc/css/application/base/standard-page-view.css' => '60d0df9a',
     'rsrc/css/application/chatlog/chatlog.css' => '852140ff',
     'rsrc/css/application/config/config-options.css' => '7fedf08b',
-    'rsrc/css/application/config/config-template.css' => '25d446d6',
+    'rsrc/css/application/config/config-template.css' => '8e6c6fcd',
     'rsrc/css/application/config/config-welcome.css' => 'b0d16200',
     'rsrc/css/application/config/setup-issue.css' => '22270af2',
     'rsrc/css/application/config/unhandled-exception.css' => '37d4f9a2',
@@ -55,7 +55,7 @@
     'rsrc/css/application/dashboard/dashboard.css' => 'c0062064',
     'rsrc/css/application/diff/inline-comment-summary.css' => 'eb5f8e8c',
     'rsrc/css/application/differential/add-comment.css' => 'c478bcaa',
-    'rsrc/css/application/differential/changeset-view.css' => 'b2b71e76',
+    'rsrc/css/application/differential/changeset-view.css' => '8244e5a8',
     'rsrc/css/application/differential/core.css' => '7ac3cabc',
     'rsrc/css/application/differential/results-table.css' => '181aa9d9',
     'rsrc/css/application/differential/revision-comment.css' => '48186045',
@@ -104,7 +104,7 @@
     'rsrc/css/application/slowvote/slowvote.css' => '266df6a1',
     'rsrc/css/application/tokens/tokens.css' => '3d0f239e',
     'rsrc/css/application/uiexample/example.css' => '528b19de',
-    'rsrc/css/core/core.css' => '8f9b9588',
+    'rsrc/css/core/core.css' => 'c8c5ecd2',
     'rsrc/css/core/remarkup.css' => 'e8e5a324',
     'rsrc/css/core/syntax.css' => '56c1ba38',
     'rsrc/css/core/z-index.css' => '8239495e',
@@ -124,14 +124,14 @@
     'rsrc/css/phui/phui-action-list.css' => '9ee9910a',
     'rsrc/css/phui/phui-action-panel.css' => '3ee9afd5',
     'rsrc/css/phui/phui-box.css' => '7b3a2eed',
-    'rsrc/css/phui/phui-button.css' => 'ffe12633',
+    'rsrc/css/phui/phui-button.css' => '21cb97f9',
     'rsrc/css/phui/phui-crumbs-view.css' => '594d719e',
     'rsrc/css/phui/phui-document.css' => '8240b0b1',
     'rsrc/css/phui/phui-error-view.css' => '41518665',
     'rsrc/css/phui/phui-feed-story.css' => 'c9f3a0b5',
-    'rsrc/css/phui/phui-fontkit.css' => '9b345998',
+    'rsrc/css/phui/phui-fontkit.css' => 'bd111278',
     'rsrc/css/phui/phui-form-view.css' => '8b78a986',
-    'rsrc/css/phui/phui-form.css' => '9aecbda1',
+    'rsrc/css/phui/phui-form.css' => 'f535f938',
     'rsrc/css/phui/phui-header-view.css' => '083669db',
     'rsrc/css/phui/phui-icon.css' => 'd35aa857',
     'rsrc/css/phui/phui-image-mask.css' => '5a8b09c8',
@@ -520,7 +520,7 @@
     'conpherence-notification-css' => '04a6e10a',
     'conpherence-update-css' => '1099a660',
     'conpherence-widget-pane-css' => '3d575438',
-    'differential-changeset-view-css' => 'b2b71e76',
+    'differential-changeset-view-css' => '8244e5a8',
     'differential-core-view-css' => '7ac3cabc',
     'differential-inline-comment-editor' => 'f2441746',
     'differential-results-table-css' => '181aa9d9',
@@ -715,12 +715,12 @@
     'phabricator-busy' => '6453c869',
     'phabricator-chatlog-css' => '852140ff',
     'phabricator-content-source-view-css' => '4b8b05d4',
-    'phabricator-core-css' => '8f9b9588',
+    'phabricator-core-css' => 'c8c5ecd2',
     'phabricator-countdown-css' => '86b7b0a0',
     'phabricator-dashboard-css' => 'c0062064',
     'phabricator-drag-and-drop-file-upload' => '8c49f386',
     'phabricator-draggable-list' => 'a16ec1c6',
-    'phabricator-fatal-config-template-css' => '25d446d6',
+    'phabricator-fatal-config-template-css' => '8e6c6fcd',
     'phabricator-feed-css' => 'b513b5f4',
     'phabricator-file-upload' => 'a4ae61bf',
     'phabricator-filetree-view-css' => 'fccf9f82',
@@ -773,7 +773,7 @@
     'phui-action-header-view-css' => '89c497e7',
     'phui-action-panel-css' => '3ee9afd5',
     'phui-box-css' => '7b3a2eed',
-    'phui-button-css' => 'ffe12633',
+    'phui-button-css' => '21cb97f9',
     'phui-calendar-css' => '8675968e',
     'phui-calendar-day-css' => 'de035c8a',
     'phui-calendar-list-css' => 'c1d0ca59',
@@ -783,8 +783,8 @@
     'phui-error-view-css' => '41518665',
     'phui-feed-story-css' => 'c9f3a0b5',
     'phui-font-icon-base-css' => '3dad2ae3',
-    'phui-fontkit-css' => '9b345998',
-    'phui-form-css' => '9aecbda1',
+    'phui-fontkit-css' => 'bd111278',
+    'phui-form-css' => 'f535f938',
     'phui-form-view-css' => '8b78a986',
     'phui-header-view-css' => '083669db',
     'phui-icon-view-css' => 'd35aa857',
diff --git a/src/applications/celerity/CelerityResourceTransformer.php b/src/applications/celerity/CelerityResourceTransformer.php
--- a/src/applications/celerity/CelerityResourceTransformer.php
+++ b/src/applications/celerity/CelerityResourceTransformer.php
@@ -171,6 +171,10 @@
 
   public static function getCSSVariableMap() {
     return array(
+      // Fonts
+      'basefont' => "13px/1.231 'Segoe UI', 'Segoe UI Web Regular', ".
+        "'Segoe UI Symbol', 'Helvetica Neue', Helvetica, Arial, sans-serif",
+
       // Base Colors
       'red'           => '#c0392b',
       'lightred'      => '#f4dddb',
diff --git a/webroot/rsrc/css/application/config/config-template.css b/webroot/rsrc/css/application/config/config-template.css
--- a/webroot/rsrc/css/application/config/config-template.css
+++ b/webroot/rsrc/css/application/config/config-template.css
@@ -6,7 +6,8 @@
   background: #f9f9f9;
   margin: 0;
   padding: 0;
-  font: 13px/1.231 'Helvetica Neue', Arial, sans-serif;
+  font: 13px/1.231 'Segoe UI', 'Segoe UI Web Regular', 'Segoe UI Symbol',
+    'Helvetica Neue', Helvetica, Arial, sans-serif;
   text-align: left;
   -webkit-text-size-adjust: none;
 }
diff --git a/webroot/rsrc/css/application/differential/changeset-view.css b/webroot/rsrc/css/application/differential/changeset-view.css
--- a/webroot/rsrc/css/application/differential/changeset-view.css
+++ b/webroot/rsrc/css/application/differential/changeset-view.css
@@ -178,7 +178,7 @@
 
 .differential-diff td.show-more,
 .differential-diff td.differential-shield {
-  font-family: "Helvetica Neue", "Arial", sans-serif;
+  font: {$basefont};
   font-size:   12px;
   white-space: normal;
 }
@@ -255,7 +255,7 @@
 .differential-inline-comment-edit {
   background:         #ffffee;
   border:             1px solid #ccccaa;
-  font-family:        "Helvetica Neue", "Arial", sans-serif;
+  font:               {$basefont};
   font-size:          12px;
   margin:             6px 0px;
   padding:            8px 10px;
diff --git a/webroot/rsrc/css/core/core.css b/webroot/rsrc/css/core/core.css
--- a/webroot/rsrc/css/core/core.css
+++ b/webroot/rsrc/css/core/core.css
@@ -51,8 +51,7 @@
 }
 
 body {
-  font: 13px/1.231 'Segoe UI', 'Segoe UI Web Regular', 'Segoe UI Symbol',
-    'Helvetica Neue', Helvetica, Arial, sans-serif;
+  font: {$basefont};
   direction: ltr;
   text-align: left;
   unicode-bidi: embed;
diff --git a/webroot/rsrc/css/phui/phui-button.css b/webroot/rsrc/css/phui/phui-button.css
--- a/webroot/rsrc/css/phui/phui-button.css
+++ b/webroot/rsrc/css/phui/phui-button.css
@@ -5,7 +5,7 @@
 
 button,
 a.button {
-  font: 13px/1.231 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  font: {$basefont};
   -webkit-font-smoothing: antialiased;
   -webkit-user-select: none;
   -moz-user-select: none;
diff --git a/webroot/rsrc/css/phui/phui-fontkit.css b/webroot/rsrc/css/phui/phui-fontkit.css
--- a/webroot/rsrc/css/phui/phui-fontkit.css
+++ b/webroot/rsrc/css/phui/phui-fontkit.css
@@ -50,13 +50,13 @@
 
 .phui-font-source-sans .phui-property-list-container {
   padding-bottom: 6px;
-  font-family: 'Helvetica Neue', Arial, sans-serif;
-  font-size: 13px;
+  font: {$basefont};
   line-height: 16px;
 }
 
 .phui-font-source-sans .phabricator-action-view {
-  font-family: 'Helvetica Neue', Arial, sans-serif;
+  font: {$basefont};
+  font-size: 12px;
 }
 
 .phui-font-source-sans a.atom-ref,
@@ -70,7 +70,7 @@
 }
 
 .phui-font-source-sans .phui-form-view {
-  font: 13px/1.231 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  font: {$basefont};
   font-weight: normal;
 }
 
diff --git a/webroot/rsrc/css/phui/phui-form.css b/webroot/rsrc/css/phui/phui-form.css
--- a/webroot/rsrc/css/phui/phui-form.css
+++ b/webroot/rsrc/css/phui/phui-form.css
@@ -24,7 +24,7 @@
   line-height: 18px;
   color: #333;
   vertical-align: middle;
-  font: 13px 'Helvetica Neue', Helvetica, Arial, sans-serif;
+  font: {$basefont};
   -webkit-font-smoothing: antialiased;
 }