diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9604b34..46bc072 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,6 +12,12 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Fragments"
         tools:targetApi="31">
+        <activity
+            android:name=".ActivityB"
+            android:exported="false" />
+        <activity
+            android:name=".ActivityA"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
new file mode 100644
index 0000000..b8ec4a5
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityA.kt
@@ -0,0 +1,16 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityA : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_a)
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.activity_a, FragmentA())
+            .commit()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
new file mode 100644
index 0000000..ef39ea2
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/ActivityB.kt
@@ -0,0 +1,16 @@
+package otus.gpb.homework.fragments
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+class ActivityB : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_b)
+
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.activity_b, FragmentB())
+            .commit()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
new file mode 100644
index 0000000..0422427
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentA.kt
@@ -0,0 +1,54 @@
+package otus.gpb.homework.fragments
+
+import android.content.Context
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.activity.OnBackPressedCallback
+import androidx.fragment.app.Fragment
+import com.google.android.material.button.MaterialButton
+
+class FragmentA : Fragment() {
+
+    private fun generateBackgroundColor() = ColorGenerator.generateColor()
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        val callback = object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                if (childFragmentManager.backStackEntryCount > 1) childFragmentManager.popBackStack()
+                else {
+                    isEnabled = false
+                    requireActivity().onBackPressedDispatcher.onBackPressed()
+                }
+            }
+        }
+        requireActivity().onBackPressedDispatcher.addCallback(this, callback)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<MaterialButton>(R.id.fragment_a_btn).setOnClickListener {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_aa, FragmentAA.newInstance(generateBackgroundColor()))
+                .addToBackStack(null)
+                .commit()
+        }
+    }
+
+    fun createFragmentAB() {
+        childFragmentManager.beginTransaction()
+            .replace(R.id.fragment_aa, FragmentAB.newInstance(generateBackgroundColor()))
+            .addToBackStack(null)
+            .commit()
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
new file mode 100644
index 0000000..d69e371
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAA.kt
@@ -0,0 +1,41 @@
+package otus.gpb.homework.fragments
+
+import android.graphics.Color
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.google.android.material.button.MaterialButton
+
+private const val COLOR_ARG = "color_arg"
+
+class FragmentAA : Fragment() {
+
+    private fun getBackgroundColor() = arguments?.getInt(COLOR_ARG) ?: Color.WHITE
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_aa, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(getBackgroundColor())
+        view.findViewById<MaterialButton>(R.id.fragment_ab_btn).setOnClickListener {
+            (parentFragment as FragmentA).createFragmentAB()
+        }
+    }
+
+    companion object {
+        fun newInstance(color: Int): FragmentAA {
+            fun setBundleArgument() = Bundle().apply { putInt(COLOR_ARG, color) }
+            return FragmentAA().apply {
+                arguments = setBundleArgument()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
new file mode 100644
index 0000000..f31263c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentAB.kt
@@ -0,0 +1,37 @@
+package otus.gpb.homework.fragments
+
+import android.graphics.Color
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+
+private const val COLOR_ARG = "color_arg"
+
+class FragmentAB : Fragment() {
+
+    private fun getBackgroundColor() = arguments?.getInt(COLOR_ARG) ?: Color.WHITE
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ab, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.setBackgroundColor(getBackgroundColor())
+    }
+
+    companion object {
+        fun newInstance(color: Int): FragmentAB {
+            fun setBundleArgument () = Bundle().apply { putInt(COLOR_ARG, color) }
+            return FragmentAB().apply {
+                arguments = setBundleArgument()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
new file mode 100644
index 0000000..244042c
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentB.kt
@@ -0,0 +1,31 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+
+class FragmentB : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.fragment_ba, FragmentBA())
+                .replace(R.id.fragment_bb, FragmentBB())
+                .addToBackStack(null)
+                .commit()
+            return inflater.inflate(R.layout.activity_b_land, container, false)
+        } else {
+            childFragmentManager.beginTransaction()
+                .replace(R.id.activity_b, FragmentBA())
+                .addToBackStack(null)
+                .commit()
+            return inflater.inflate(R.layout.activity_b, container, false)
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
new file mode 100644
index 0000000..1faf6a3
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBA.kt
@@ -0,0 +1,46 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.graphics.Color
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.google.android.material.button.MaterialButton
+
+private const val COLOR_ARG = "color_arg"
+private const val FRAGMENT_REQUESTED_COLOR = "fr_req_color"
+
+class FragmentBA : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_ba, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        parentFragmentManager.setFragmentResultListener(FRAGMENT_REQUESTED_COLOR, this) { _, bundle ->
+            val backgroundColor = bundle.getInt(COLOR_ARG, Color.WHITE)
+            view.setBackgroundColor(backgroundColor)
+        }
+
+        val openBbBtn = view.findViewById<MaterialButton>(R.id.fragment_bb_btn)
+
+        if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
+            openBbBtn.visibility = View.GONE
+        } else {
+            openBbBtn.setOnClickListener {
+                parentFragmentManager.beginTransaction()
+                    .replace(R.id.activity_b, FragmentBB())
+                    .addToBackStack(null)
+                    .commit()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
new file mode 100644
index 0000000..60c0fea
--- /dev/null
+++ b/app/src/main/java/otus/gpb/homework/fragments/FragmentBB.kt
@@ -0,0 +1,36 @@
+package otus.gpb.homework.fragments
+
+import android.content.res.Configuration
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import com.google.android.material.button.MaterialButton
+
+private const val COLOR_ARG = "color_arg"
+private const val FRAGMENT_REQUESTED_COLOR = "fr_req_color"
+
+class FragmentBB : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return inflater.inflate(R.layout.fragment_bb, container, false)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<MaterialButton>(R.id.send_color_btn).setOnClickListener {
+            val result = Bundle().apply { putInt(COLOR_ARG, ColorGenerator.generateColor()) }
+            parentFragmentManager.setFragmentResult(FRAGMENT_REQUESTED_COLOR, result)
+
+            if (resources.configuration.orientation == Configuration.ORIENTATION_PORTRAIT) {
+                parentFragmentManager.popBackStack()
+            }
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
index 5e89c44..9883330 100644
--- a/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
+++ b/app/src/main/java/otus/gpb/homework/fragments/MainActivity.kt
@@ -1,12 +1,22 @@
 package otus.gpb.homework.fragments
 
+import android.content.Intent
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.button.MaterialButton
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        findViewById<MaterialButton>(R.id.activity_a_btn).setOnClickListener {
+            startActivity(Intent(this, ActivityA::class.java))
+        }
+
+        findViewById<MaterialButton>(R.id.activity_b_btn).setOnClickListener {
+            startActivity(Intent(this, ActivityB::class.java))
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/res/layout-land/activity_b_land.xml b/app/src/main/res/layout-land/activity_b_land.xml
new file mode 100644
index 0000000..15a4d81
--- /dev/null
+++ b/app/src/main/res/layout-land/activity_b_land.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/activity_b"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="horizontal"
+    android:showDividers="middle">
+
+    <FrameLayout
+        android:id="@+id/fragment_ba"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+    <View
+        android:layout_width="2dp"
+        android:layout_height="match_parent"
+        android:background="@color/black" />
+
+    <FrameLayout
+        android:id="@+id/fragment_bb"
+        android:layout_width="0dp"
+        android:layout_height="match_parent"
+        android:layout_weight="1" />
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_a.xml b/app/src/main/res/layout/activity_a.xml
new file mode 100644
index 0000000..36d5b37
--- /dev/null
+++ b/app/src/main/res/layout/activity_a.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/activity_a"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ActivityA">
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_b.xml b/app/src/main/res/layout/activity_b.xml
new file mode 100644
index 0000000..0989962
--- /dev/null
+++ b/app/src/main/res/layout/activity_b.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/activity_b"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 17eab17..e23a813 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -6,13 +6,23 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/activity_a_btn"
+        android:text="@string/open_activity_a"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/activity_b_btn"
+        android:text="@string/open_activity_b"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/activity_a_btn" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_a.xml b/app/src/main/res/layout/fragment_a.xml
new file mode 100644
index 0000000..aab9348
--- /dev/null
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TextView
+            android:id="@+id/fragment_a_tv"
+            style="@style/FragmentsTitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_a_title"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/fragment_a_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/fragment_a_tv"
+            android:text="@string/open_fragment_aa"
+            android:textAllCaps="false"/>
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+    <FrameLayout
+        android:id="@+id/fragment_aa"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_aa.xml b/app/src/main/res/layout/fragment_aa.xml
new file mode 100644
index 0000000..5e82500
--- /dev/null
+++ b/app/src/main/res/layout/fragment_aa.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TextView
+            android:id="@+id/fragment_aa_tv"
+            style="@style/FragmentsTitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_aa_title"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/fragment_ab_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/open_fragment_ab"
+            android:textAllCaps="false"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/fragment_aa_tv" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ab.xml b/app/src/main/res/layout/fragment_ab.xml
new file mode 100644
index 0000000..7625bec
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ab.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/fragment_ab_title"
+        style="@style/FragmentsTitleText"
+        android:gravity="center"/>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_ba.xml b/app/src/main/res/layout/fragment_ba.xml
new file mode 100644
index 0000000..fbc0d03
--- /dev/null
+++ b/app/src/main/res/layout/fragment_ba.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TextView
+            android:id="@+id/fragment_ba_tv"
+            style="@style/FragmentsTitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_ba_title"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/fragment_bb_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/open_fragment_bb"
+            android:textAllCaps="false"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/fragment_ba_tv" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_bb.xml b/app/src/main/res/layout/fragment_bb.xml
new file mode 100644
index 0000000..3cd85df
--- /dev/null
+++ b/app/src/main/res/layout/fragment_bb.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TextView
+            android:id="@+id/fragment_bb_tv"
+            style="@style/FragmentsTitleText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/fragment_bb_title"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/send_color_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/send_color"
+            android:textAllCaps="false"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/fragment_bb_tv" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 34277aa..3d63ff3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,14 @@
 <resources>
     <string name="app_name">Fragments</string>
+    <string name="open_activity_a">open Activity A</string>
+    <string name="open_activity_b">open Activity B</string>
+    <string name="fragment_a_title">Fragment A</string>
+    <string name="fragment_aa_title">Fragment AA</string>
+    <string name="fragment_ab_title">Fragment AB</string>
+    <string name="fragment_ba_title">Fragment BA</string>
+    <string name="fragment_bb_title">Fragment BB</string>
+    <string name="open_fragment_ab">open Fragment AB</string>
+    <string name="open_fragment_aa">open Fragment AA</string>
+    <string name="open_fragment_bb">open Fragment BB</string>
+    <string name="send_color">Send color</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
new file mode 100644
index 0000000..d103b11
--- /dev/null
+++ b/app/src/main/res/values/styles.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="FragmentsTitleText" parent="@style/TextAppearance.Material3.TitleLarge">
+        <item name="android:padding">16dp</item>
+    </style>
+</resources>
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bd20018..598d925 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '8.7.2' apply false
-    id 'com.android.library' version '8.7.2' apply false
+    id 'com.android.application' version '8.12.3' apply false
+    id 'com.android.library' version '8.12.3' apply false
     id 'org.jetbrains.kotlin.android' version '2.0.21' apply false
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1f1d072..f464719 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 #Tue Nov 05 08:41:56 CET 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists