diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 8bea3d3..1175110 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -23,8 +23,8 @@ android {
         applicationId = "com.example.maposition"
         minSdk = 21
         targetSdk = 36
-        versionCode = 3
-        versionName = "1.2"
+        versionCode = 4
+        versionName = "1.3"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/src/main/java/com/example/maposition/MainActivity.kt b/app/src/main/java/com/example/maposition/MainActivity.kt
index 4dcabd4..5b398a5 100644
--- a/app/src/main/java/com/example/maposition/MainActivity.kt
+++ b/app/src/main/java/com/example/maposition/MainActivity.kt
@@ -26,7 +26,6 @@ import com.google.android.gms.location.FusedLocationProviderClient
 import com.google.android.gms.location.LocationServices
 import com.google.android.gms.location.Priority
 import com.google.android.gms.tasks.CancellationTokenSource
-import com.google.android.material.button.MaterialButton
 import com.google.android.material.card.MaterialCardView
 import com.google.android.material.progressindicator.CircularProgressIndicator
 import java.util.concurrent.TimeUnit
@@ -49,7 +48,7 @@ class MainActivity : AppCompatActivity() {
 
     private val handler = Handler(Looper.getMainLooper())
 
-    private lateinit var sendButton: MaterialButton
+    private lateinit var sendButton: View
     private lateinit var statusText: TextView
     private lateinit var progress: CircularProgressIndicator
     private lateinit var recipientsText: TextView
@@ -166,6 +165,7 @@ class MainActivity : AppCompatActivity() {
         busy = true
         resetReportState()
         sendButton.isEnabled = false
+        sendButton.alpha = 0.55f
         progress.visibility = View.VISIBLE
         setStatus(getString(R.string.status_locating))
 
@@ -285,6 +285,7 @@ class MainActivity : AppCompatActivity() {
         busy = false
         progress.visibility = View.GONE
         sendButton.isEnabled = true
+        sendButton.alpha = 1f
     }
 
     private fun resetReportState() {
diff --git a/app/src/main/res/drawable-nodpi/bg_watermark.jpg b/app/src/main/res/drawable-nodpi/bg_watermark.jpg
new file mode 100644
index 0000000..beada34
Binary files /dev/null and b/app/src/main/res/drawable-nodpi/bg_watermark.jpg differ
diff --git a/app/src/main/res/drawable/globe_button_bg.xml b/app/src/main/res/drawable/globe_button_bg.xml
new file mode 100644
index 0000000..c281c10
--- /dev/null
+++ b/app/src/main/res/drawable/globe_button_bg.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="#40FFFFFF">
+    <item>
+        <shape android:shape="oval">
+            <gradient
+                android:type="radial"
+                android:centerX="0.35"
+                android:centerY="0.28"
+                android:gradientRadius="200dp"
+                android:startColor="#4A9DFF"
+                android:centerColor="#1E63C8"
+                android:endColor="#0A2F73" />
+            <stroke
+                android:width="3dp"
+                android:color="#59FFFFFF" />
+        </shape>
+    </item>
+</ripple>
diff --git a/app/src/main/res/drawable/ic_globe.xml b/app/src/main/res/drawable/ic_globe.xml
new file mode 100644
index 0000000..8a4121d
--- /dev/null
+++ b/app/src/main/res/drawable/ic_globe.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM11,19.93c-3.95,-0.49 -7,-3.85 -7,-7.93 0,-0.62 0.08,-1.21 0.21,-1.79L9,15v1c0,1.1 0.9,2 2,2v1.93zM17.9,17.39c-0.26,-0.81 -1,-1.39 -1.9,-1.39h-1v-3c0,-0.55 -0.45,-1 -1,-1L8,12v-2h2c0.55,0 1,-0.45 1,-1L11,7h2c1.1,0 2,-0.9 2,-2v-0.41c2.93,1.19 5,4.06 5,7.41 0,2.08 -0.8,3.97 -2.1,5.39z" />
+</vector>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3821c46..8c08d1f 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -2,51 +2,98 @@
 <androidx.constraintlayout.widget.ConstraintLayout 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"
-    android:padding="24dp">
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/bgImage"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:alpha="0.10"
+        android:importantForAccessibility="no"
+        android:scaleType="centerCrop"
+        android:src="@drawable/bg_watermark"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
 
     <TextView
         android:id="@+id/titleText"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="24dp"
         android:text="@string/app_name"
-        android:textSize="26sp"
+        android:textSize="28sp"
         android:textStyle="bold"
         app:layout_constraintEnd_toStartOf="@id/settingsButton"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <TextView
+        android:id="@+id/subtitleText"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="2dp"
+        android:text="@string/subtitle"
+        android:textColor="?attr/colorOnSurfaceVariant"
+        android:textSize="14sp"
+        app:layout_constraintEnd_toStartOf="@id/settingsButton"
+        app:layout_constraintStart_toStartOf="@id/titleText"
+        app:layout_constraintTop_toBottomOf="@id/titleText" />
+
     <ImageButton
         android:id="@+id/settingsButton"
         android:layout_width="48dp"
         android:layout_height="48dp"
+        android:layout_marginEnd="16dp"
         android:background="?attr/selectableItemBackgroundBorderless"
         android:contentDescription="@string/settings_title"
         android:src="@drawable/ic_settings"
-        app:layout_constraintBottom_toBottomOf="@id/titleText"
+        app:layout_constraintBottom_toBottomOf="@id/subtitleText"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="@id/titleText"
         app:tint="?attr/colorOnSurfaceVariant" />
 
-    <com.google.android.material.button.MaterialButton
+    <FrameLayout
         android:id="@+id/sendButton"
-        android:layout_width="240dp"
-        android:layout_height="240dp"
-        android:text="@string/send_button"
-        android:textColor="@color/white"
-        android:textSize="17sp"
-        android:textStyle="bold"
-        app:backgroundTint="@color/brand_blue"
-        app:cornerRadius="120dp"
-        app:icon="@drawable/ic_pin"
-        app:iconGravity="top"
-        app:iconSize="44dp"
-        app:iconTint="@color/white"
+        android:layout_width="256dp"
+        android:layout_height="256dp"
+        android:background="@drawable/globe_button_bg"
+        android:clickable="true"
+        android:elevation="12dp"
+        android:focusable="true"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.38" />
+        app:layout_constraintVertical_bias="0.36">
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:gravity="center"
+            android:orientation="vertical">
+
+            <ImageView
+                android:layout_width="88dp"
+                android:layout_height="88dp"
+                android:importantForAccessibility="no"
+                android:src="@drawable/ic_globe" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:gravity="center"
+                android:letterSpacing="0.06"
+                android:text="@string/send_button"
+                android:textColor="@color/white"
+                android:textSize="16sp"
+                android:textStyle="bold" />
+        </LinearLayout>
+    </FrameLayout>
 
     <com.google.android.material.progressindicator.CircularProgressIndicator
         android:id="@+id/progress"
@@ -64,7 +111,9 @@
         android:id="@+id/statusText"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
         android:layout_marginTop="12dp"
+        android:layout_marginEnd="24dp"
         android:gravity="center"
         android:textSize="15sp"
         app:layout_constraintEnd_toEndOf="parent"
@@ -75,9 +124,11 @@
         android:id="@+id/recipientsCard"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
+        android:layout_margin="20dp"
         android:clickable="true"
         android:focusable="true"
-        app:cardCornerRadius="16dp"
+        app:cardCornerRadius="18dp"
+        app:cardElevation="3dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent">
@@ -92,9 +143,9 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:text="@string/recipients_label"
+                android:textColor="?attr/colorOnSurfaceVariant"
                 android:textSize="13sp"
-                android:textStyle="bold"
-                android:textColor="?attr/colorOnSurfaceVariant" />
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/recipientsText"
diff --git a/app/src/main/res/layout/activity_settings.xml b/app/src/main/res/layout/activity_settings.xml
index 3b2eafd..11624fa 100644
--- a/app/src/main/res/layout/activity_settings.xml
+++ b/app/src/main/res/layout/activity_settings.xml
@@ -1,6 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<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">
+
+    <ImageView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:alpha="0.07"
+        android:importantForAccessibility="no"
+        android:scaleType="centerCrop"
+        android:src="@drawable/bg_watermark" />
+
+<LinearLayout
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
@@ -74,3 +86,4 @@
         app:cornerRadius="16dp" />
 
 </LinearLayout>
+</FrameLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 97f2d28..509d19e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,6 +1,7 @@
 <resources>
     <string name="app_name">Ma Position</string>
     <string name="settings_title">Paramètres</string>
+    <string name="subtitle">Votre position par SMS, en un geste</string>
     <string name="back">Retour</string>
 
     <!-- Écran principal -->