diff --git a/app/src/main/res/anim/typing_dots_animation.xml b/app/src/main/res/anim/typing_dots_animation.xml
index 72c6c894..00135f3e 100644
--- a/app/src/main/res/anim/typing_dots_animation.xml
+++ b/app/src/main/res/anim/typing_dots_animation.xml
@@ -1,12 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!--
-  타이핑 인디케이터용 알파 애니메이션
-  - duration: 600ms
-  - fromAlpha: 0.3 -> toAlpha: 1.0
-  - repeat: infinite, reverse
-  - 3개의 점을 순차적으로 반짝이게 하려면, 이 애니메이션을 각 점에 적용하고 startOffset을 다르게 지정하세요.
-    예) dot1: 0ms, dot2: 200ms, dot3: 400ms
--->
 <set xmlns:android="http://schemas.android.com/apk/res/android">
     <alpha
         android:duration="600"
diff --git a/app/src/main/res/layout/item_chat_ai_message.xml b/app/src/main/res/layout/item_chat_ai_message.xml
new file mode 100644
index 00000000..832eb99f
--- /dev/null
+++ b/app/src/main/res/layout/item_chat_ai_message.xml
@@ -0,0 +1,98 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  AI 메시지 아이템 레이아웃 (3.3)
+  - 왼쪽 정렬된 메시지 버블
+  - 프로필 이미지, 이름(조건부), 메시지, 시간(오른쪽, 조건부)
+  - 배경: @drawable/bg_chat_ai_message
+  - 그룹화 지원: iv_profile, tv_name, tv_time의 가시성을 어댑터에서 제어
+-->
+<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="wrap_content"
+    android:paddingStart="12dp"
+    android:paddingEnd="12dp"
+    android:paddingTop="6dp"
+    android:paddingBottom="6dp">
+
+    <!-- 프로필 이미지 (그룹 첫 메시지에서만 보임) -->
+    <ImageView
+        android:id="@+id/iv_profile"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_marginEnd="8dp"
+        android:scaleType="centerCrop"
+        android:src="@drawable/ic_placeholder_profile"
+        android:contentDescription="AI 프로필 이미지"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent" />
+
+    <!-- 메시지 그룹: 이름 + 메시지 버블 -->
+    <LinearLayout
+        android:id="@+id/message_group"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintStart_toEndOf="@id/iv_profile"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/tv_time"
+        app:layout_constraintHorizontal_bias="0"
+        android:layout_marginEnd="8dp">
+
+        <!-- 보낸이 이름 (그룹의 첫 메시지에서만 보임) -->
+        <TextView
+            android:id="@+id/tv_name"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="@android:color/white"
+            android:textSize="12sp"
+            android:includeFontPadding="false"
+            android:layout_marginBottom="2dp"
+            android:maxLines="1"
+            android:ellipsize="end" />
+
+        <!-- 메시지 버블 컨테이너 -->
+        <androidx.constraintlayout.widget.ConstraintLayout
+            android:id="@+id/message_container"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:background="@drawable/bg_chat_ai_message"
+            android:paddingStart="14dp"
+            android:paddingEnd="14dp"
+            android:paddingTop="10dp"
+            android:paddingBottom="10dp">
+
+            <TextView
+                android:id="@+id/tv_message"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textColor="@android:color/white"
+                android:textSize="15sp"
+                android:lineSpacingExtra="2dp"
+                android:includeFontPadding="false"
+                android:hyphenationFrequency="normal"
+                android:breakStrategy="balanced"
+                android:ellipsize="end"
+                android:maxLines="1000"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintEnd_toEndOf="parent" />
+        </androidx.constraintlayout.widget.ConstraintLayout>
+    </LinearLayout>
+
+    <!-- 전송 시간: 버블의 오른쪽에 표시 (그룹의 마지막 메시지에서만 보임) -->
+    <TextView
+        android:id="@+id/tv_time"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textColor="@color/color_777777"
+        android:textSize="12sp"
+        android:includeFontPadding="false"
+        app:layout_constraintBottom_toBottomOf="@id/message_group"
+        app:layout_constraintStart_toEndOf="@id/message_group"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginStart="8dp" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/item_chat_typing_indicator.xml b/app/src/main/res/layout/item_chat_typing_indicator.xml
new file mode 100644
index 00000000..ee5e8421
--- /dev/null
+++ b/app/src/main/res/layout/item_chat_typing_indicator.xml
@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  타이핑 인디케이터 아이템 레이아웃 (3.4)
+  - AI 메시지 레이아웃과 동일한 좌측 정렬 구조
+  - 메시지 영역 대신 3개 점(•••) 애니메이션 표시
+  - 애니메이션: @anim/typing_dots_animation (순차 반짝임은 추후 ViewHolder에서 startOffset 제어 가능)
+-->
+<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="wrap_content"
+    android:paddingStart="12dp"
+    android:paddingEnd="12dp"
+    android:paddingTop="6dp"
+    android:paddingBottom="6dp">
+
+    <!-- 프로필 이미지 (AI) -->
+    <ImageView
+        android:id="@+id/iv_profile"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_marginEnd="8dp"
+        android:scaleType="centerCrop"
+        android:src="@drawable/ic_placeholder_profile"
+        android:contentDescription="AI 프로필 이미지"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent" />
+
+    <!-- 이름 + 타이핑 버블 그룹 -->
+    <LinearLayout
+        android:id="@+id/message_group"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintStart_toEndOf="@id/iv_profile"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginEnd="56dp">
+
+        <!-- 보낸이 이름 (필요 시 표시) -->
+        <TextView
+            android:id="@+id/tv_name"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="@android:color/white"
+            android:textSize="12sp"
+            android:includeFontPadding="false"
+            android:layout_marginBottom="2dp"
+            android:maxLines="1"
+            android:ellipsize="end" />
+
+        <!-- 타이핑 표시 컨테이너 (AI 버블 배경 재사용 가능) -->
+        <androidx.constraintlayout.widget.ConstraintLayout
+            android:id="@+id/typing_container"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:background="@drawable/bg_chat_ai_message"
+            android:paddingStart="14dp"
+            android:paddingEnd="14dp"
+            android:paddingTop="10dp"
+            android:paddingBottom="10dp">
+
+            <!-- 3개 점 애니메이션 -->
+            <LinearLayout
+                android:id="@+id/ll_typing_dots"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintEnd_toEndOf="parent">
+
+                <TextView
+                    android:id="@+id/dot1"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="\u2022"
+                    android:textSize="18sp"
+                    android:textColor="@android:color/white"
+                    android:includeFontPadding="false"
+                    android:animation="@anim/typing_dots_animation" />
+
+                <TextView
+                    android:id="@+id/dot2"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="4dp"
+                    android:text="\u2022"
+                    android:textSize="18sp"
+                    android:textColor="@android:color/white"
+                    android:includeFontPadding="false"
+                    android:animation="@anim/typing_dots_animation" />
+
+                <TextView
+                    android:id="@+id/dot3"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="4dp"
+                    android:text="\u2022"
+                    android:textSize="18sp"
+                    android:textColor="@android:color/white"
+                    android:includeFontPadding="false"
+                    android:animation="@anim/typing_dots_animation" />
+            </LinearLayout>
+        </androidx.constraintlayout.widget.ConstraintLayout>
+    </LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/item_chat_user_message.xml b/app/src/main/res/layout/item_chat_user_message.xml
new file mode 100644
index 00000000..2e16d870
--- /dev/null
+++ b/app/src/main/res/layout/item_chat_user_message.xml
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  사용자 메시지 아이템 레이아웃
+  - 오른쪽 정렬된 메시지 버블
+  - 버블의 왼쪽에 시간 표시
+  - 배경: @drawable/bg_chat_user_message
+-->
+<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="wrap_content"
+    android:paddingStart="12dp"
+    android:paddingEnd="12dp"
+    android:paddingTop="6dp"
+    android:paddingBottom="6dp">
+
+    <!-- 전송 시간: 버블의 왼쪽에 표시 -->
+    <TextView
+        android:id="@+id/tv_time"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textColor="@color/color_777777"
+        android:textSize="12sp"
+        android:includeFontPadding="false"
+        app:layout_constraintBottom_toBottomOf="@id/message_container"
+        app:layout_constraintEnd_toStartOf="@id/message_container"
+        app:layout_constraintStart_toStartOf="parent"
+        android:layout_marginEnd="8dp"/>
+
+    <!-- 메시지 버블 컨테이너: 오른쪽 정렬 -->
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/message_container"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:background="@drawable/bg_chat_user_message"
+        android:paddingStart="14dp"
+        android:paddingEnd="14dp"
+        android:paddingTop="10dp"
+        android:paddingBottom="10dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@id/tv_time">
+
+        <TextView
+            android:id="@+id/tv_message"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="@android:color/white"
+            android:textSize="15sp"
+            android:lineSpacingExtra="2dp"
+            android:includeFontPadding="false"
+            android:hyphenationFrequency="normal"
+            android:breakStrategy="balanced"
+            android:ellipsize="end"
+            android:maxLines="1000"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintEnd_toEndOf="parent" />
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>