diff --git a/app/src/main/res/drawable/bg_chat_ai_message.xml b/app/src/main/res/drawable/bg_chat_ai_message.xml
new file mode 100644
index 00000000..2f70235e
--- /dev/null
+++ b/app/src/main/res/drawable/bg_chat_ai_message.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- AI 메시지용 배경: color_111111 10% 투명, 코너: 4dp 16dp 16dp 16dp (TL, TR, BR, BL) -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+android:shape="rectangle">
+<solid android:color="#1A111111" />
+<corners
+    android:topLeftRadius="4dp"
+    android:topRightRadius="16dp"
+    android:bottomRightRadius="16dp"
+    android:bottomLeftRadius="16dp" />
+</shape>
diff --git a/app/src/main/res/drawable/bg_chat_input.xml b/app/src/main/res/drawable/bg_chat_input.xml
new file mode 100644
index 00000000..4333229d
--- /dev/null
+++ b/app/src/main/res/drawable/bg_chat_input.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 입력창 배경: 기존 bg_round_corner_999_263238.xml 활용 -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@drawable/bg_round_corner_999_263238" />
+</selector>
diff --git a/app/src/main/res/drawable/bg_chat_notice.xml b/app/src/main/res/drawable/bg_chat_notice.xml
new file mode 100644
index 00000000..bc83efc7
--- /dev/null
+++ b/app/src/main/res/drawable/bg_chat_notice.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 안내 메시지용 배경: 반투명 다크, 라운드 16dp -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <!-- 0.7 opacity of #13181B => #B313181B -->
+    <solid android:color="#B313181B" />
+    <corners android:radius="16dp" />
+</shape>
diff --git a/app/src/main/res/drawable/bg_chat_user_message.xml b/app/src/main/res/drawable/bg_chat_user_message.xml
new file mode 100644
index 00000000..f6dbf87d
--- /dev/null
+++ b/app/src/main/res/drawable/bg_chat_user_message.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 사용자 메시지용 배경: color_3bb9f1 70% 투명, 코너: 16dp 4dp 16dp 16dp (TL, TR, BR, BL) -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <!-- 0.7 opacity of #3BB9F1 => #B33BB9F1 -->
+    <solid android:color="#B33BB9F1" />
+    <corners
+        android:topLeftRadius="16dp"
+        android:topRightRadius="4dp"
+        android:bottomRightRadius="16dp"
+        android:bottomLeftRadius="16dp" />
+</shape>