diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 79761ab..610f1ea 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -38,7 +38,7 @@
         android:label="@string/app_name"
         android:networkSecurityConfig="@xml/network_security_config"
         android:supportsRtl="true"
-        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+        android:theme="@style/AppTheme">
         <activity
             android:name=".LoginActivity"
             android:exported="true"
@@ -52,105 +52,81 @@
         <activity
             android:name=".MainActivity"
             android:launchMode="singleTask"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".RegisterActivity"
             android:screenOrientation="portrait"
             android:theme="@style/ThemeSplash" />
         <activity
             android:name=".UserActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".YinsiActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".QRActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".AddStudentActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".NickActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".SexActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".NianActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ShenActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".UserAgreementActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".AccountActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
 
         <activity
             android:name=".ChangePwdActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".EditStudentActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ChooseActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".AddTeacherActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ErrorBookActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ImageActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ImageEditActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ImageSelectActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".AddSuccessActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ErrorListActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".ErrorDetailActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".TeacherChooseActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity
             android:name=".TeacherMainActivity"
-            android:screenOrientation="portrait"
-            android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
+            android:screenOrientation="portrait" />
         <activity android:name=".StuHomeworkActivity" />
         <activity android:name=".HomeworkDetailActivity" />
         <activity android:name=".HomeworkSelectActivity" />
diff --git a/app/src/main/res/layout/dialog_add_homework.xml b/app/src/main/res/layout/dialog_add_homework.xml
index 50c443b..d3496fa 100644
--- a/app/src/main/res/layout/dialog_add_homework.xml
+++ b/app/src/main/res/layout/dialog_add_homework.xml
@@ -146,7 +146,7 @@
                 <TextView
                     android:id="@+id/tvDate"
                     tools:text="2024-09-18"
-                    android:textSize="16sp"
+                    android:textSize="13sp"
                     android:textColor="#333"
                     android:gravity="center_vertical"
                     android:paddingHorizontal="16dp"
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 4395fbe..c85bad1 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,8 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
+        <!-- 全局应用的 Spinner 样式 -->
+        <item name="android:spinnerItemStyle">@style/CustomSpinnerItemStyle</item>
+    </style>
 
+    <style name="CustomSpinnerItemStyle" parent="@style/Widget.AppCompat.TextView.SpinnerItem">
+        <item name="android:textSize">13sp</item>
+    </style>
 
-    <style name="ThemeSplash" parent="Theme.AppCompat.Light.NoActionBar">
+
+    <style name="ThemeSplash" parent="AppTheme">
         <item name="android:windowBackground">@drawable/welcome_bg</item>
         <item name="colorPrimaryDark">@android:color/transparent</item>
         <item name="windowActionBar">false</item>
@@ -50,7 +58,7 @@
         <item name="divider">@color/border</item>
         <item name="android:scrollbars">none</item>
         <item name="android:dividerHeight">1dp</item>
-        <item name="android:textSize">15sp</item>
+        <item name="android:textSize">13sp</item>
     </style>
 
     <style name="empty_space">