整个课程和数据UI重新设计版本

kouyu_english/lib/features/lesson/steps/reading_step.dart

@@ -21,6 +21,9 @@ class _ReadingStepState extends State<_ReadingStep> {
   int? selectedOptionIndex;
   bool showAnswer = false;
 
+  /// Typed answers are judged on tap, not on every keystroke.
+  bool typedAnswerChecked = false;
+
   /// 打乱后的选项：答案不再固定排在第一位，但同一道题顺序保持稳定。
   late final List<String> options = shuffledOptions(
     widget.activity.readingOptions,
@@ -332,7 +335,7 @@ class _ReadingStepState extends State<_ReadingStep> {
           ] else ...[
             TextField(
               controller: controller,
-              onChanged: (_) => setState(() {}),
+              onChanged: (_) => setState(() => typedAnswerChecked = false),
               decoration: InputDecoration(
                 hintText: '用英文输入答案',
                 filled: true,
@@ -340,6 +343,14 @@ class _ReadingStepState extends State<_ReadingStep> {
                 border: OutlineInputBorder(),
               ),
             ),
+            if (typedAnswerChecked && !answeredCorrectly && !showAnswer)
+              SectionCard(
+                tint: AppColors.warm,
+                child: Text(
+                  '不对哦：答案需要写全对话里的关键词。再读一遍对话，或查看答案后继续。',
+                  style: TextStyle(color: AppColors.warmInk),
+                ),
+              ),
           ],
           if (showAnswer)
             SectionCard(
@@ -351,9 +362,7 @@ class _ReadingStepState extends State<_ReadingStep> {
             ),
           if (!showAnswer &&
               ((isOptionMode && hasSelected && !answeredCorrectly) ||
-                  (!isOptionMode &&
-                      controller.text.isNotEmpty &&
-                      !answeredCorrectly)))
+                  (!isOptionMode && typedAnswerChecked && !answeredCorrectly)))
             TextButton(
               onPressed: () => setState(() => showAnswer = true),
               child: const Text('查看答案后继续学习'),
@@ -364,6 +373,8 @@ class _ReadingStepState extends State<_ReadingStep> {
                 : (isOptionMode ? '请选择答案' : '检查并继续'),
             onPressed: showAnswer || answeredCorrectly
                 ? widget.onContinue
+                : !isOptionMode && controller.text.trim().isNotEmpty
+                ? () => setState(() => typedAnswerChecked = true)
                 : null,
           ),
         ],