diff --git a/core/css/apps.css b/core/css/apps.css
index 33bcbf09d68508556731f0500647721d29f76102..ac2be40ac5b72a575a11970bdd4274ee5433d0ef 100644
--- a/core/css/apps.css
+++ b/core/css/apps.css
@@ -566,11 +566,11 @@ button.loading {
 .section h2 {
 	font-size: 20px;
 	margin-bottom: 12px;
-	font-weight: normal;
+	font-weight: 300;
 }
 .section h3 {
 	font-size: 15px;
-	font-weight: normal;
+	font-weight: 300;
 	margin: 12px 0;
 }
 /* slight position correction of checkboxes and radio buttons */
diff --git a/core/css/fonts.css b/core/css/fonts.css
index de2742c63684051a92c1fcfdc92f4d2c0f324829..2a894031e547e77a29f16d689c1d7157d7f89def 100644
--- a/core/css/fonts.css
+++ b/core/css/fonts.css
@@ -1,3 +1,13 @@
+/* for low-res screens, use Regular font-weight instead of Light */
+@media (-webkit-max-device-pixel-ratio: 1.3), (max-resolution: 124.8dpi) {
+	@font-face {
+		font-family: 'Open Sans';
+		font-style: normal;
+		font-weight: normal;
+		src: local('Open Sans'), local('OpenSans'), url(../fonts/OpenSans-Regular.woff) format('woff');
+	}
+}
+
 @font-face {
 	font-family: 'Open Sans';
 	font-style: normal;
diff --git a/core/css/header.css b/core/css/header.css
index 369750251c48d58dc575fcd74de41313b2888a76..37f06ef0632e5053c5136e10f9628a46a2613920 100644
--- a/core/css/header.css
+++ b/core/css/header.css
@@ -119,6 +119,7 @@
 	position: relative;
 	color: #fff;
 	font-size: 16px;
+	font-weight: 300;
 	margin: 0;
 	margin-top: -24px;
 	padding: 7px 0 7px 5px;
@@ -352,3 +353,11 @@
 		-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
 		opacity: 1;
 	}
+
+/* do not show display name when profile picture is present */
+#header .avatardiv.avatardiv-shown + #expandDisplayName {
+	display: none;
+}
+#header #expand {
+	display: block;
+}
diff --git a/core/css/mobile.css b/core/css/mobile.css
index 26f7b8520b9a69a4042d41a5be5f8da18dfdf507..288ae2979de44d9d869e504ae8db848a6dd4282d 100644
--- a/core/css/mobile.css
+++ b/core/css/mobile.css
@@ -26,14 +26,6 @@
 	display: none;
 }
 
-/* do not show display name on mobile when profile picture is present */
-#header .avatardiv.avatardiv-shown + #expandDisplayName {
-	display: none;
-}
-#header #expand {
-	display: block;
-}
-
 /* do not show update notification on mobile */
 #update-notification {
 	display: none !important;
diff --git a/core/css/styles.css b/core/css/styles.css
index 15325eada3396d66d09458bb2805f3b3eb02f6c0..0a48c60f939bddfdda884e37cfb1d11aa9a0c793 100644
--- a/core/css/styles.css
+++ b/core/css/styles.css
@@ -27,7 +27,7 @@ select:hover {
 
 body {
 	background-color: #ffffff;
-	font-weight: 300;
+	font-weight: 400;
 	font-size: .8em;
 	line-height: 1.6em;
 	font-family: 'Open Sans', Frutiger, Calibri, 'Myriad Pro', Myriad, sans-serif;
@@ -258,6 +258,9 @@ button, .button,
 	border: 1px solid rgba(240,240,240,.9);
 	cursor: pointer;
 }
+select, .button.multiselect {
+	font-weight: 400;
+}
 input[type="submit"]:hover, input[type="submit"]:focus,
 input[type="button"]:hover, input[type="button"]:focus,
 button:hover, button:focus,
@@ -591,6 +594,7 @@ input[type="submit"].enabled {
 #body-login input[type="password"],
 #body-login input[type="email"] {
 	border: none;
+	font-weight: 300;
 }
 
 /* Nicely grouping input field sets */
diff --git a/core/fonts/OpenSans-Regular.woff b/core/fonts/OpenSans-Regular.woff
new file mode 100644
index 0000000000000000000000000000000000000000..2abc3ed69fd619c57169a7515ea0b4481dfbf2a0
Binary files /dev/null and b/core/fonts/OpenSans-Regular.woff differ
diff --git a/settings/css/settings.css b/settings/css/settings.css
index 5fa9b30a647d7cffc9f15edcd8b3a1fd40ed2388..60ba805d3ca0eef4c8c7d664445231f9b175ea56 100644
--- a/settings/css/settings.css
+++ b/settings/css/settings.css
@@ -19,6 +19,7 @@ input#openid, input#webdav { width:20em; }
 	margin-top: -30px;
 }
 .clientsbox h2 {
+	font-weight: 300;
 	font-size: 20px;
 	margin: 35px 0 10px;
 }
@@ -26,7 +27,7 @@ input#openid, input#webdav { width:20em; }
 	margin-top: 10px;
 }
 .clientsbox a {
-	font-weight: bold;
+	font-weight: 600;
 }
 
 #displaynameerror {