diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index b75758c..d1e7f40 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 = 5
-        versionName = "1.4"
+        versionCode = 6
+        versionName = "1.5"
 
         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 7394e13..75a6b14 100644
--- a/app/src/main/java/com/example/maposition/MainActivity.kt
+++ b/app/src/main/java/com/example/maposition/MainActivity.kt
@@ -9,6 +9,9 @@ import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.pm.PackageManager
+import android.content.res.ColorStateList
+import android.graphics.Color
+import android.graphics.Typeface
 import android.location.Location
 import android.os.Build
 import android.os.Bundle
@@ -125,11 +128,20 @@ class MainActivity : AppCompatActivity() {
 
         groupChips.visibility = View.VISIBLE
         val active = Prefs.getActiveGroup(this)!!
+        val blue = ContextCompat.getColor(this, R.color.brand_blue)
         groups.forEach { g ->
+            val checked = g.name == active.name
             val chip = Chip(this).apply {
                 text = g.name
                 isCheckable = true
-                isChecked = g.name == active.name
+                isChecked = checked
+                if (checked) {
+                    chipBackgroundColor = ColorStateList.valueOf(blue)
+                    setTextColor(Color.WHITE)
+                    typeface = Typeface.DEFAULT_BOLD
+                } else {
+                    alpha = 0.5f
+                }
                 setOnClickListener {
                     Prefs.setActiveGroupName(this@MainActivity, g.name)
                     refreshRecipientsCard()
diff --git a/app/src/main/res/drawable/globe_button_bg.xml b/app/src/main/res/drawable/globe_button_bg.xml
index c281c10..32c6cc6 100644
--- a/app/src/main/res/drawable/globe_button_bg.xml
+++ b/app/src/main/res/drawable/globe_button_bg.xml
@@ -2,18 +2,42 @@
 <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>
+        <layer-list>
+            <!-- Halo extérieur -->
+            <item>
+                <shape android:shape="oval">
+                    <solid android:color="#1C4A9DFF" />
+                </shape>
+            </item>
+            <item
+                android:bottom="9dp"
+                android:left="9dp"
+                android:right="9dp"
+                android:top="9dp">
+                <shape android:shape="oval">
+                    <solid android:color="#304A9DFF" />
+                </shape>
+            </item>
+            <!-- Sphère -->
+            <item
+                android:bottom="18dp"
+                android:left="18dp"
+                android:right="18dp"
+                android:top="18dp">
+                <shape android:shape="oval">
+                    <gradient
+                        android:type="radial"
+                        android:centerX="0.33"
+                        android:centerY="0.25"
+                        android:gradientRadius="190dp"
+                        android:startColor="#5FB0FF"
+                        android:centerColor="#1E63C8"
+                        android:endColor="#082B66" />
+                    <stroke
+                        android:width="2dp"
+                        android:color="#8CFFFFFF" />
+                </shape>
+            </item>
+        </layer-list>
     </item>
 </ripple>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index d0caca3..6b4bf80 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,18 +4,25 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <androidx.constraintlayout.widget.Guideline
+        android:id="@+id/bgGuide"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        app:layout_constraintGuide_percent="0.42" />
+
     <ImageView
         android:id="@+id/bgImage"
         android:layout_width="0dp"
         android:layout_height="0dp"
-        android:alpha="0.10"
+        android:alpha="0.16"
         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" />
+        app:layout_constraintTop_toTopOf="@id/bgGuide" />
 
     <TextView
         android:id="@+id/titleText"
@@ -45,42 +52,39 @@
 
     <FrameLayout
         android:id="@+id/sendButton"
-        android:layout_width="256dp"
-        android:layout_height="256dp"
+        android:layout_width="236dp"
+        android:layout_height="236dp"
         android:background="@drawable/globe_button_bg"
         android:clickable="true"
-        android:elevation="12dp"
         android:focusable="true"
-        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/bgGuide"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.36">
+        app:layout_constraintTop_toBottomOf="@id/subtitleText"
+        app:layout_constraintVertical_bias="0.85">
 
-        <LinearLayout
+        <ImageView
+            android:layout_width="196dp"
+            android:layout_height="196dp"
+            android:layout_gravity="center"
+            android:alpha="0.30"
+            android:importantForAccessibility="no"
+            android:src="@drawable/ic_globe" />
+
+        <TextView
             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>
+            android:letterSpacing="0.08"
+            android:lineSpacingExtra="4dp"
+            android:shadowColor="#99000000"
+            android:shadowDy="2"
+            android:shadowRadius="8"
+            android:text="@string/send_button"
+            android:textColor="@color/white"
+            android:textSize="17sp"
+            android:textStyle="bold" />
     </FrameLayout>
 
     <com.google.android.material.progressindicator.CircularProgressIndicator