Use lighter text colour for preference categories.

briar-android/src/main/res/layout/divider_preference.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<View xmlns:android="http://schemas.android.com/apk/res/android"
-      android:layout_width="match_parent"
-      android:layout_height="1dp"
-      android:background="@color/divider">
-</View>

briar-android/src/main/res/layout/preferences_category.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+          android:id="@android:id/title"
+          android:layout_width="match_parent"
+          android:layout_height="wrap_content"
+          android:layout_marginTop="16dp"
+          android:layout_marginLeft="16dp"
+          android:layout_marginStart="16dp"
+          android:textSize="14sp"
+          android:textStyle="bold"
+          android:textColor="@color/briar_blue_light"/>

briar-android/src/main/res/values/color.xml

@@ -2,8 +2,10 @@
 <resources>
 	<color name="briar_blue">#2D3E50</color>
 	<color name="briar_blue_dark">#0F1720</color>
+	<color name="briar_blue_light">#4F6C8C</color>
 	<color name="briar_gold">#FCCF1C</color>
 	<color name="briar_green_light">#95D220</color>
+	<color name="briar_link">#06B9FF</color>
 
 	<color name="window_background">#eceff1</color>
 	<color name="action_bar_text">#FFFFFF</color>
@@ -19,23 +21,20 @@
 	<color name="control_normal_light">#757575</color>
 
 	<!-- text colors -->
-	<color name="briar_text_link">#06b9ff</color>
+	<color name="briar_text_link">@color/briar_link</color>
 	<color name="briar_text_primary">#df000000</color>
 	<color name="briar_text_primary_inverse">#ffffff</color>
 	<color name="briar_text_secondary">#8a000000</color>
 	<color name="briar_text_secondary_inverse">#b4ffffff</color>
 	<color name="briar_text_tertiary">#61000000</color>
 	<color name="briar_text_tertiary_inverse">#80ffffff</color>
-	<color name="briar_button_positive">#06b9ff</color>
+	<color name="briar_button_positive">@color/briar_link</color>
 	<color name="briar_button_negative">#ff0000</color>
 	<color name="briar_warning_background">#ff0000</color>
 	<color name="emoji_text_color">#ff000000</color>
 
 	<color name="emoji_pager_background">@color/window_background</color>
 
-	<!-- this is needed as preference_category_material layout uses this color as the text color -->
-	<color name="preference_fallback_accent_color">@color/briar_accent</color>
-
 	<color name="thread_indicator">#9e9e9e</color>
 	<color name="divider">#c1c1c1</color>
 	<color name="menu_background">#FFFFFF</color>

briar-android/src/main/res/values/themes.xml

@@ -9,10 +9,7 @@
 		<item name="android:textColorLink">@color/briar_text_link</item>
 		<item name="android:windowBackground">@color/window_background</item>
 		<item name="android:windowAnimationStyle">@style/ActivityAnimation</item>
-
-		<!-- These fix a long-standing UI bug in the support preference library -->
 		<item name="preferenceTheme">@style/PreferenceThemeOverlay.v14.Material</item>
-		<item name="android:listSeparatorTextViewStyle">@style/BriarTheme.ListSeparatorTextView</item>
 	</style>
 
 	<style name="BriarTheme.NoActionBar" parent="BriarTheme">
@@ -56,13 +53,4 @@
 		<item name="buttonBarNeutralButtonStyle">@style/Widget.AppCompat.Button.Borderless</item>
 	</style>
 
-	<!-- This fixes a UI bug in the support preference library -->
-	<style name="BriarTheme.ListSeparatorTextView">
-		<item name="android:textSize">14sp</item>
-		<item name="android:textStyle">bold</item>
-		<item name="android:textColor">@color/briar_accent</item>
-		<item name="android:paddingTop">16dp</item>
-		<item name="android:layout_marginBottom">16dp</item>
-	</style>
-
 </resources>

briar-android/src/main/res/xml/settings.xml

@@ -3,6 +3,7 @@
 	xmlns:android="http://schemas.android.com/apk/res/android">
 
 	<PreferenceCategory
+		android:layout="@layout/preferences_category"
 		android:title="@string/network_settings_title">
 
 		<ListPreference
@@ -25,9 +26,8 @@
 
 	</PreferenceCategory>
 
-	<PreferenceCategory android:layout="@layout/divider_preference"/>
-
 	<PreferenceCategory
+		android:layout="@layout/preferences_category"
 		android:title="@string/security_settings_title">
 
 		<Preference
@@ -41,9 +41,8 @@
 
 	</PreferenceCategory>
 
-	<PreferenceCategory android:layout="@layout/divider_preference"/>
-
 	<PreferenceCategory
+		android:layout="@layout/preferences_category"
 		android:title="@string/panic_setting_title">
 
 		<Preference
@@ -58,9 +57,8 @@
 
 	</PreferenceCategory>
 
-	<PreferenceCategory android:layout="@layout/divider_preference"/>
-
 	<PreferenceCategory
+		android:layout="@layout/preferences_category"
 		android:title="@string/notification_settings_title">
 
 		<CheckBoxPreference
@@ -111,9 +109,8 @@
 
 	</PreferenceCategory>
 
-	<PreferenceCategory android:layout="@layout/divider_preference"/>
-
 	<PreferenceCategory
+		android:layout="@layout/preferences_category"
 		android:title="@string/feedback_settings_title">
 
 		<Preference