diff --git a/lib/app_upgrade_simple.dart b/lib/app_upgrade_simple.dart
index 21279ab..6585e4f 100644
--- a/lib/app_upgrade_simple.dart
+++ b/lib/app_upgrade_simple.dart
@@ -1122,13 +1122,14 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
   ///
   /// 采用自定义解析器，逐字符扫描并使用递归解析子内容，从而支持任意嵌套。
   List<TextSpan> _parseRichText(String content, ColorScheme colorScheme) {
-    final result = _parseRichTextInternal(content, colorScheme, 0, null);
+    final styles = _RichTextStyles(colorScheme);
+    final result = _parseRichTextInternal(content, styles, 0, null);
     return result.spans;
   }
 
   _RichTextParseResult _parseRichTextInternal(
     String text,
-    ColorScheme colorScheme,
+    _RichTextStyles styles,
     int startIndex,
     String? endToken,
   ) {
@@ -1140,7 +1141,7 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
       if (buffer.isEmpty) return;
       spans.add(TextSpan(
         text: buffer.toString(),
-        style: _defaultRichTextStyle(colorScheme),
+        style: styles.defaultStyle,
       ));
       buffer.clear();
     }
@@ -1157,13 +1158,13 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
 
       // [高亮]
       if (currentChar == '[') {
-        final innerResult = _parseRichTextInternal(text, colorScheme, index + 1, ']');
+        final innerResult = _parseRichTextInternal(text, styles, index + 1, ']');
         if (innerResult.closed) {
           flushBuffer();
           final innerText = text.substring(index + 1, innerResult.nextIndex - 1);
           spans.addAll(_applyStyleToSpans(
             innerResult.spans,
-            _highlightTextStyle(colorScheme),
+            styles.highlightStyle,
             innerText,
           ));
           index = innerResult.nextIndex;
@@ -1183,7 +1184,7 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
           final codeText = text.substring(index + 1, closingIndex);
           spans.add(TextSpan(
             text: codeText,
-            style: _codeTextStyle(colorScheme),
+            style: styles.codeStyle,
           ));
           index = closingIndex + 1;
           handled = true;
@@ -1196,13 +1197,13 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
       }
       // **粗体**
       else if (text.startsWith('**', index)) {
-        final innerResult = _parseRichTextInternal(text, colorScheme, index + 2, '**');
+        final innerResult = _parseRichTextInternal(text, styles, index + 2, '**');
         if (innerResult.closed) {
           flushBuffer();
           final innerText = text.substring(index + 2, innerResult.nextIndex - 2);
           spans.addAll(_applyStyleToSpans(
             innerResult.spans,
-            _boldTextStyle(colorScheme),
+            styles.boldStyle,
             innerText,
           ));
           index = innerResult.nextIndex;
@@ -1216,13 +1217,13 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
       }
       // __斜体__
       else if (text.startsWith('__', index)) {
-        final innerResult = _parseRichTextInternal(text, colorScheme, index + 2, '__');
+        final innerResult = _parseRichTextInternal(text, styles, index + 2, '__');
         if (innerResult.closed) {
           flushBuffer();
           final innerText = text.substring(index + 2, innerResult.nextIndex - 2);
           spans.addAll(_applyStyleToSpans(
             innerResult.spans,
-            _italicTextStyle(colorScheme),
+            styles.italicStyle,
             innerText,
           ));
           index = innerResult.nextIndex;
@@ -1244,51 +1245,6 @@ mixin _UpgradeDialogLogic<T extends StatefulWidget> on State<T> {
     return _RichTextParseResult(spans, index, false);
   }
 
-  TextStyle _defaultRichTextStyle(ColorScheme colorScheme) {
-    return TextStyle(
-      fontSize: 13,
-      color: colorScheme.onSurface.withOpacity(0.8),
-      height: 1.4,
-    );
-  }
-
-  TextStyle _boldTextStyle(ColorScheme colorScheme) {
-    return TextStyle(
-      fontSize: 13,
-      color: colorScheme.onSurface.withOpacity(0.9),
-      height: 1.4,
-      fontWeight: FontWeight.bold,
-    );
-  }
-
-  TextStyle _italicTextStyle(ColorScheme colorScheme) {
-    return TextStyle(
-      fontSize: 13,
-      color: colorScheme.onSurface.withOpacity(0.9),
-      height: 1.4,
-      fontStyle: FontStyle.italic,
-    );
-  }
-
-  TextStyle _codeTextStyle(ColorScheme colorScheme) {
-    return TextStyle(
-      fontSize: 12,
-      color: colorScheme.primary,
-      height: 1.4,
-      fontFamily: 'monospace',
-      backgroundColor: colorScheme.primaryContainer.withOpacity(0.2),
-    );
-  }
-
-  TextStyle _highlightTextStyle(ColorScheme colorScheme) {
-    return TextStyle(
-      fontSize: 13,
-      color: colorScheme.primary,
-      height: 1.4,
-      fontWeight: FontWeight.w600,
-    );
-  }
-
   List<TextSpan> _applyStyleToSpans(List<TextSpan> spans, TextStyle style, String fallbackText) {
     if (spans.isEmpty) {
       return [
@@ -2218,6 +2174,46 @@ class _ToastWidget extends StatelessWidget {
 
 typedef BoolCallback = void Function(bool success);
 
+class _RichTextStyles {
+  _RichTextStyles(ColorScheme colorScheme)
+      : defaultStyle = TextStyle(
+          fontSize: 13,
+          color: colorScheme.onSurface.withOpacity(0.8),
+          height: 1.4,
+        ),
+        boldStyle = TextStyle(
+          fontSize: 13,
+          color: colorScheme.onSurface.withOpacity(0.9),
+          height: 1.4,
+          fontWeight: FontWeight.bold,
+        ),
+        italicStyle = TextStyle(
+          fontSize: 13,
+          color: colorScheme.onSurface.withOpacity(0.9),
+          height: 1.4,
+          fontStyle: FontStyle.italic,
+        ),
+        codeStyle = TextStyle(
+          fontSize: 12,
+          color: colorScheme.primary,
+          height: 1.4,
+          fontFamily: 'monospace',
+          backgroundColor: colorScheme.primaryContainer.withOpacity(0.2),
+        ),
+        highlightStyle = TextStyle(
+          fontSize: 13,
+          color: colorScheme.primary,
+          height: 1.4,
+          fontWeight: FontWeight.w600,
+        );
+
+  final TextStyle defaultStyle;
+  final TextStyle boldStyle;
+  final TextStyle italicStyle;
+  final TextStyle codeStyle;
+  final TextStyle highlightStyle;
+}
+
 class _RichTextParseResult {
   final List<TextSpan> spans;
   final int nextIndex;