diff --git a/res/drawable-hdpi/copy.png b/res/drawable-hdpi/copy.png
new file mode 100644
index 00000000..34b0283b
Binary files /dev/null and b/res/drawable-hdpi/copy.png differ
diff --git a/res/drawable-hdpi/heart.png b/res/drawable-hdpi/heart.png
new file mode 100644
index 00000000..b4608722
Binary files /dev/null and b/res/drawable-hdpi/heart.png differ
diff --git a/res/drawable-hdpi/logo.png b/res/drawable-hdpi/logo.png
new file mode 100644
index 00000000..9d2d600d
Binary files /dev/null and b/res/drawable-hdpi/logo.png differ
diff --git a/res/drawable-hdpi/paste.png b/res/drawable-hdpi/paste.png
new file mode 100644
index 00000000..f4764680
Binary files /dev/null and b/res/drawable-hdpi/paste.png differ
diff --git a/res/drawable-hdpi/sym_keyboard_delete.png b/res/drawable-hdpi/sym_keyboard_delete.png
new file mode 100644
index 00000000..f02cef88
Binary files /dev/null and b/res/drawable-hdpi/sym_keyboard_delete.png differ
diff --git a/res/drawable-ldpi/copy.png b/res/drawable-ldpi/copy.png
new file mode 100644
index 00000000..34b0283b
Binary files /dev/null and b/res/drawable-ldpi/copy.png differ
diff --git a/res/drawable-ldpi/heart.png b/res/drawable-ldpi/heart.png
new file mode 100644
index 00000000..b4608722
Binary files /dev/null and b/res/drawable-ldpi/heart.png differ
diff --git a/res/drawable-ldpi/logo.png b/res/drawable-ldpi/logo.png
new file mode 100644
index 00000000..9d2d600d
Binary files /dev/null and b/res/drawable-ldpi/logo.png differ
diff --git a/res/drawable-ldpi/paste.png b/res/drawable-ldpi/paste.png
new file mode 100644
index 00000000..f4764680
Binary files /dev/null and b/res/drawable-ldpi/paste.png differ
diff --git a/res/drawable-ldpi/sym_keyboard_delete.png b/res/drawable-ldpi/sym_keyboard_delete.png
new file mode 100644
index 00000000..f02cef88
Binary files /dev/null and b/res/drawable-ldpi/sym_keyboard_delete.png differ
diff --git a/res/drawable-mdpi/copy.png b/res/drawable-mdpi/copy.png
new file mode 100644
index 00000000..34b0283b
Binary files /dev/null and b/res/drawable-mdpi/copy.png differ
diff --git a/res/drawable-mdpi/heart.png b/res/drawable-mdpi/heart.png
new file mode 100644
index 00000000..b4608722
Binary files /dev/null and b/res/drawable-mdpi/heart.png differ
diff --git a/res/drawable-mdpi/logo.png b/res/drawable-mdpi/logo.png
new file mode 100644
index 00000000..9d2d600d
Binary files /dev/null and b/res/drawable-mdpi/logo.png differ
diff --git a/res/drawable-mdpi/paste.png b/res/drawable-mdpi/paste.png
new file mode 100644
index 00000000..f4764680
Binary files /dev/null and b/res/drawable-mdpi/paste.png differ
diff --git a/res/drawable-mdpi/sym_keyboard_delete.png b/res/drawable-mdpi/sym_keyboard_delete.png
new file mode 100644
index 00000000..f02cef88
Binary files /dev/null and b/res/drawable-mdpi/sym_keyboard_delete.png differ
diff --git a/res/layout/calc_history_button.xml b/res/layout/calc_history_button.xml
index 732f86b1..f089ae2b 100644
--- a/res/layout/calc_history_button.xml
+++ b/res/layout/calc_history_button.xml
@@ -12,6 +12,5 @@
 													   calc:textUp="@string/c_undo"
 													   calc:textDown="@string/c_redo"
 													   style="?controlButtonStyle"
-													   a:textSize="18dp"
 													   a:textStyle="bold"
 													   a:onClick="historyButtonClickHandler"/>
\ No newline at end of file
diff --git a/res/layout/history.xml b/res/layout/history.xml
index 323df2a0..98840f02 100644
--- a/res/layout/history.xml
+++ b/res/layout/history.xml
@@ -14,16 +14,11 @@
 	<TextView a:id="@+id/history_time"
 			  a:layout_width="fill_parent"
 			  a:layout_height="fill_parent"
-			  a:textColor="@android:color/white"
-			  a:paddingLeft="6dp"
-			  a:paddingRight="6dp"
-			  a:textStyle="bold"/>
+			  style="@style/history_time"/>
 
 	<TextView a:id="@+id/history_item"
 			  a:layout_width="fill_parent"
 			  a:layout_height="fill_parent"
-			  a:paddingBottom="6dp"
-			  a:paddingLeft="6dp"
-			  a:paddingRight="6dp"/>
+			  style="@style/history_item"/>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/res/layout/var.xml b/res/layout/var.xml
index 2fdc739d..0a07b948 100644
--- a/res/layout/var.xml
+++ b/res/layout/var.xml
@@ -19,13 +19,7 @@
 		<TextView a:id="@+id/var_text"
 				  a:layout_width="fill_parent"
 				  a:layout_height="fill_parent"
-				  a:textSize="20dp"
-				  a:textColor="@android:color/white"
-				  a:paddingBottom="3dp"
-				  a:paddingLeft="6dp"
-				  a:paddingRight="6dp"
-				  a:paddingTop="6dp"
-				  a:textStyle="bold">
+				  style="@style/var_text">
 		</TextView>
 
 	</LinearLayout>
@@ -33,10 +27,7 @@
 	<TextView a:id="@+id/var_description"
 			  a:layout_width="fill_parent"
 			  a:layout_height="fill_parent"
-			  a:paddingBottom="6dp"
-			  a:paddingLeft="6dp"
-			  a:paddingRight="6dp"
-			  a:paddingTop="0dp">
+			  style="@style/var_description">
 	</TextView>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/res/layout/var_edit.xml b/res/layout/var_edit.xml
index 4e458571..50984080 100644
--- a/res/layout/var_edit.xml
+++ b/res/layout/var_edit.xml
@@ -21,16 +21,18 @@
 		<TextView a:layout_height="fill_parent"
 				  a:layout_width="wrap_content"
 				  a:padding="6dp"
+				  style="@style/default_text_size"
 				  a:text="@string/c_var_name"/>
 
 		<EditText a:id="@+id/var_edit_name"
 				  a:layout_width="fill_parent"
 				  a:layout_height="wrap_content"
-				  a:textSize="20dp">
+				  style="@style/default_text_size">
 		</EditText>
 
 		<TextView a:layout_height="fill_parent"
 				  a:layout_width="wrap_content"
+				  style="@style/default_text_size"
 				  a:padding="6dp"
 				  a:text="@string/c_var_value"/>
 
@@ -38,18 +40,19 @@
 				  a:layout_width="fill_parent"
 				  a:layout_height="wrap_content"
 				  a:inputType="numberDecimal"
-				  a:textSize="20dp">
+				  style="@style/default_text_size">
 		</EditText>
 
 		<TextView a:layout_height="fill_parent"
 				  a:layout_width="wrap_content"
 				  a:padding="6dp"
+				  style="@style/default_text_size"
 				  a:text="@string/c_var_description"/>
 
 		<EditText a:id="@+id/var_edit_description"
 				  a:layout_width="fill_parent"
 				  a:layout_height="wrap_content"
-				  a:textSize="20dp">
+				  style="@style/default_text_size">
 		</EditText>
 
 	</LinearLayout>
diff --git a/res/layout/vars.xml b/res/layout/vars.xml
index f999168a..20341704 100644
--- a/res/layout/vars.xml
+++ b/res/layout/vars.xml
@@ -22,8 +22,7 @@
         a:layout_height="wrap_content"
         a:layout_gravity="center_horizontal"
         a:text="@string/c_add"
-		a:paddingLeft="40dp"
-		a:paddingRight="40dp"
+		style="@style/add_var_button"
         a:onClick="addVarButtonClickHandler"/>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/res/values-hdpi/styles.xml b/res/values-hdpi/styles.xml
new file mode 100644
index 00000000..849380a1
--- /dev/null
+++ b/res/values-hdpi/styles.xml
@@ -0,0 +1,44 @@
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<resources>
+
+	<style name="default_text_size">
+		<item name="android:textSize">20dp</item>
+	</style>
+
+	<style name="button_style_parent" parent="default_text_size">
+		<item name="android:textColor">@color/button_text_color</item>
+	</style>
+
+	<style name="display_style_parent" parent="default_text">
+		<item name="android:textSize">25dp</item>
+		<item name="android:padding">5dp</item>
+	</style>
+
+	<style name="editor_style_parent" parent="default_text">
+		<item name="android:textSize">25dp</item>
+		<item name="android:padding">5dp</item>
+	</style>
+
+	<style name="about_style_parent" parent="default_text">
+		<item name="android:textSize">15dp</item>
+		<item name="android:padding">5dp</item>
+	</style>
+
+	<style name="var_text_parent" parent="default_text_size">
+	</style>
+
+	<style name="var_description_parent">
+		<item name="android:textSize">15dp</item>
+	</style>
+
+	<style name="add_var_button_parent">
+		<item name="android:paddingLeft">40dp</item>
+		<item name="android:paddingRight">40dp</item>
+	</style>
+
+</resources>
\ No newline at end of file
diff --git a/res/values-ldpi/styles.xml b/res/values-ldpi/styles.xml
new file mode 100644
index 00000000..b2bfc0cc
--- /dev/null
+++ b/res/values-ldpi/styles.xml
@@ -0,0 +1,44 @@
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<resources>
+
+	<style name="button_style_parent">
+		<item name="android:textSize">40dp</item>
+		<item name="android:textColor">@color/button_text_color</item>
+	</style>
+
+	<style name="display_style_parent" parent="default_text">
+		<item name="android:textSize">50dp</item>
+		<item name="android:padding">10dp</item>
+	</style>
+
+	<style name="editor_style_parent" parent="default_text">
+		<item name="android:textSize">50dp</item>
+		<item name="android:padding">10dp</item>
+	</style>
+
+	<style name="about_style_parent" parent="default_text">
+		<item name="android:textSize">30dp</item>
+		<item name="android:padding">10dp</item>
+	</style>
+
+	<style name="var_text_parent">
+		<item name="android:textSize">40dp</item>
+	</style>
+
+	<style name="var_description_parent">
+		<item name="android:textSize">30dp</item>
+	</style>
+
+	<style name="add_var_button_parent">
+		<item name="android:paddingLeft">80dp</item>
+		<item name="android:paddingRight">80dp</item>
+	</style>
+
+
+
+</resources>
\ No newline at end of file
diff --git a/res/values-mdpi/styles.xml b/res/values-mdpi/styles.xml
new file mode 100644
index 00000000..d38dc3d2
--- /dev/null
+++ b/res/values-mdpi/styles.xml
@@ -0,0 +1,43 @@
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<resources>
+
+	<style name="button_style_parent">
+		<item name="android:textSize">30dp</item>
+		<item name="android:textColor">@color/button_text_color</item>
+	</style>
+
+	<style name="display_style_parent" parent="default_text">
+		<item name="android:textSize">37dp</item>
+		<item name="android:padding">7dp</item>
+	</style>
+
+	<style name="editor_style_parent" parent="default_text">
+		<item name="android:textSize">37dp</item>
+		<item name="android:padding">7dp</item>
+	</style>
+
+	<style name="about_style_parent" parent="default_text">
+		<item name="android:textSize">23dp</item>
+		<item name="android:padding">7dp</item>
+	</style>
+
+	<style name="var_text_parent">
+		<item name="android:textSize">30dp</item>
+	</style>
+
+	<style name="var_description_parent">
+		<item name="android:textSize">23dp</item>
+	</style>
+
+	<style name="add_var_button_parent">
+		<item name="android:paddingLeft">60dp</item>
+		<item name="android:paddingRight">60dp</item>
+	</style>
+
+
+</resources>
\ No newline at end of file
diff --git a/res/values/colors.xml b/res/values/colors.xml
index dcae5b06..2613c677 100644
--- a/res/values/colors.xml
+++ b/res/values/colors.xml
@@ -1,5 +1,12 @@
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
 <resources>
-    <color name="magic_flame">#00ffffff</color>
-    <color name="button_text_color">#ffffffff</color>
-    <color name="text_color">#ffffffff</color>
+	<color name="magic_flame">#00ffffff</color>
+	<color name="button_text_color">#ffffffff</color>
+	<color name="default_text_color">#ffffffff</color>
+	<color name="default_background">#ff000000</color>
 </resources>
\ No newline at end of file
diff --git a/res/values/styles-common-history.xml b/res/values/styles-common-history.xml
new file mode 100644
index 00000000..cb132b75
--- /dev/null
+++ b/res/values/styles-common-history.xml
@@ -0,0 +1,15 @@
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<resources>
+
+	<style name="history_time" parent="var_text">
+	</style>
+
+	<style name="history_item" parent="var_description">
+	</style>
+
+</resources>
\ No newline at end of file
diff --git a/res/values/styles-common-var.xml b/res/values/styles-common-var.xml
new file mode 100644
index 00000000..195a9db9
--- /dev/null
+++ b/res/values/styles-common-var.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<resources>
+
+	<style name="var_text" parent="var_text_parent">
+		<item name="android:paddingTop">6dp</item>
+		<item name="android:paddingLeft">6dp</item>
+		<item name="android:paddingRight">6dp</item>
+		<item name="android:paddingBottom">3dp</item>
+		<item name="android:textStyle">bold</item>
+		<item name="android:textColor">@android:color/white</item>
+	</style>
+
+	<style name="var_description" parent="var_description_parent">
+		<item name="android:paddingTop">0dp</item>
+		<item name="android:paddingLeft">6dp</item>
+		<item name="android:paddingRight">6dp</item>
+		<item name="android:paddingBottom">6dp</item>
+		<item name="android:textColor">#bebebe</item>
+	</style>
+
+	<style name="add_var_button" parent="add_var_button_parent">
+	</style>
+
+</resources>
\ No newline at end of file
diff --git a/res/values/styles-common.xml b/res/values/styles-common.xml
new file mode 100644
index 00000000..624d8e96
--- /dev/null
+++ b/res/values/styles-common.xml
@@ -0,0 +1,95 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<resources>
+
+	<style name="button_style" parent="button_style_parent">
+		<item name="android:layout_width">fill_parent</item>
+		<item name="android:layout_height">fill_parent</item>
+		<item name="android:layout_weight">1</item>
+		<item name="android:focusable">true</item>
+		<item name="android:background">@drawable/button</item>
+		<item name="android:layout_marginLeft">1dp</item>
+		<item name="android:layout_marginBottom">1dp</item>
+	</style>
+
+	<style name="default_digit_button_style" parent="button_style">
+		<item name="android:background">@drawable/blue_button</item>
+	</style>
+
+	<style name="violet_digit_button_style" parent="button_style">
+		<item name="android:background">@drawable/violet_button</item>
+	</style>
+
+	<style name="light_blue_digit_button_style" parent="button_style">
+		<item name="android:background">@drawable/light_blue_button</item>
+	</style>
+
+	<style name="default_control_button_style" parent="button_style"/>
+
+	<style name="violet_control_button_style" parent="button_style">
+		<item name="android:background">@drawable/dark_violet_button</item>
+	</style>
+
+	<style name="light_blue_control_button_style" parent="button_style">
+		<item name="android:background">@drawable/dark_blue_button</item>
+	</style>
+
+	<style name="default_control_image_button_style" parent="default_control_button_style">
+		<item name="android:padding">6dp</item>
+	</style>
+
+	<style name="violet_control_image_button_style" parent="violet_control_button_style">
+		<item name="android:padding">6dp</item>
+	</style>
+
+	<style name="light_blue_control_image_button_style" parent="light_blue_control_button_style">
+		<item name="android:padding">6dp</item>
+	</style>
+
+	<style name="editor_style" parent="editor_style_parent">
+		<item name="android:gravity">left|top</item>
+		<item name="android:layout_width">fill_parent</item>
+		<item name="android:layout_height">fill_parent</item>
+	</style>
+
+	<style name="display_style" parent="display_style_parent">
+		<item name="android:gravity">right|center_vertical</item>
+		<item name="android:layout_width">fill_parent</item>
+		<item name="android:layout_height">fill_parent</item>
+	</style>
+
+	<style name="about_style" parent="about_style_parent">
+		<item name="android:gravity">center</item>
+		<item name="android:layout_width">fill_parent</item>
+		<item name="android:layout_height">fill_parent</item>
+	</style>
+
+	<style name="default_theme">
+		<item name="digitButtonStyle">@style/default_digit_button_style</item>
+		<item name="controlButtonStyle">@style/default_control_button_style</item>
+		<item name="controlImageButtonStyle">@style/default_control_image_button_style</item>
+	</style>
+
+	<style name="violet_theme">
+		<item name="digitButtonStyle">@style/violet_digit_button_style</item>
+		<item name="controlButtonStyle">@style/violet_control_button_style</item>
+		<item name="controlImageButtonStyle">@style/violet_control_image_button_style</item>
+	</style>
+
+	<style name="light_blue_theme">
+		<item name="digitButtonStyle">@style/light_blue_digit_button_style</item>
+		<item name="controlButtonStyle">@style/light_blue_control_button_style</item>
+		<item name="controlImageButtonStyle">@style/light_blue_control_image_button_style</item>
+	</style>
+
+	<style name="default_text">
+		<item name="android:background">@color/default_background</item>
+		<item name="android:textColor">@color/default_text_color</item>
+	</style>
+
+</resources>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 4421f250..849380a1 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -1,103 +1,44 @@
-<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
 <resources>
 
-	<style name="editTextInputStyle">
-		<item name="android:layout_width">fill_parent</item>
-		<item name="android:layout_height">wrap_content</item>
-		<item name="android:typeface">monospace</item>
-	</style>
-
-	<style name="button_style">
-		<item name="android:layout_width">fill_parent</item>
-		<item name="android:layout_height">fill_parent</item>
-		<item name="android:layout_weight">1</item>
-		<item name="android:focusable">true</item>
+	<style name="default_text_size">
 		<item name="android:textSize">20dp</item>
-		<item name="android:background">@drawable/button</item>
-		<item name="android:layout_marginLeft">1dp</item>
-		<item name="android:layout_marginBottom">1dp</item>
 	</style>
 
-	<style name="default_digit_button_style" parent="button_style">
-		<item name="android:background">@drawable/blue_button</item>
+	<style name="button_style_parent" parent="default_text_size">
+		<item name="android:textColor">@color/button_text_color</item>
 	</style>
 
-	<style name="violet_digit_button_style" parent="button_style">
-		<item name="android:background">@drawable/violet_button</item>
-	</style>
-
-	<style name="light_blue_digit_button_style" parent="button_style">
-		<item name="android:background">@drawable/light_blue_button</item>
-	</style>
-
-	<style name="default_control_button_style" parent="button_style"/>
-
-	<style name="violet_control_button_style" parent="button_style">
-		<item name="android:background">@drawable/dark_violet_button</item>
-	</style>
-
-	<style name="light_blue_control_button_style" parent="button_style">
-		<item name="android:background">@drawable/dark_blue_button</item>
-	</style>
-
-	<style name="default_control_image_button_style" parent="default_control_button_style">
-		<item name="android:padding">6dp</item>
-	</style>
-
-	<style name="violet_control_image_button_style" parent="violet_control_button_style">
-		<item name="android:padding">6dp</item>
-	</style>
-
-	<style name="light_blue_control_image_button_style" parent="light_blue_control_button_style">
-		<item name="android:padding">6dp</item>
-	</style>
-
-	<style name="editor_style">
+	<style name="display_style_parent" parent="default_text">
 		<item name="android:textSize">25dp</item>
-		<item name="android:background">#000000</item>
-		<item name="android:textColor">@color/text_color</item>
-		<item name="android:gravity">left|top</item>
 		<item name="android:padding">5dp</item>
-		<item name="android:layout_width">fill_parent</item>
-		<item name="android:layout_height">fill_parent</item>
 	</style>
 
-	<style name="display_style">
+	<style name="editor_style_parent" parent="default_text">
 		<item name="android:textSize">25dp</item>
-		<item name="android:background">#000000</item>
-		<item name="android:textColor">@color/text_color</item>
-		<item name="android:gravity">right|center_vertical</item>
 		<item name="android:padding">5dp</item>
-		<item name="android:layout_width">fill_parent</item>
-		<item name="android:layout_height">fill_parent</item>
 	</style>
 
-	<style name="about_style">
+	<style name="about_style_parent" parent="default_text">
 		<item name="android:textSize">15dp</item>
-		<item name="android:background">#000000</item>
-		<item name="android:textColor">@color/text_color</item>
-		<item name="android:gravity">center</item>
 		<item name="android:padding">5dp</item>
-		<item name="android:layout_width">fill_parent</item>
-		<item name="android:layout_height">fill_parent</item>
 	</style>
 
-	<style name="default_theme">
-		<item name="digitButtonStyle">@style/default_digit_button_style</item>
-		<item name="controlButtonStyle">@style/default_control_button_style</item>
-		<item name="controlImageButtonStyle">@style/default_control_image_button_style</item>
+	<style name="var_text_parent" parent="default_text_size">
 	</style>
 
-	<style name="violet_theme">
-		<item name="digitButtonStyle">@style/violet_digit_button_style</item>
-		<item name="controlButtonStyle">@style/violet_control_button_style</item>
-		<item name="controlImageButtonStyle">@style/violet_control_image_button_style</item>
+	<style name="var_description_parent">
+		<item name="android:textSize">15dp</item>
 	</style>
 
-	<style name="light_blue_theme">
-		<item name="digitButtonStyle">@style/light_blue_digit_button_style</item>
-		<item name="controlButtonStyle">@style/light_blue_control_button_style</item>
-		<item name="controlImageButtonStyle">@style/light_blue_control_image_button_style</item>
+	<style name="add_var_button_parent">
+		<item name="android:paddingLeft">40dp</item>
+		<item name="android:paddingRight">40dp</item>
 	</style>
 
-</resources>
+</resources>
\ No newline at end of file