fix: improve word selection and remove markdown formatting

- Let AI model handle word difficulty filtering with specific instructions
- Remove hardcoded technical term filtering in favor of AI selection
- Add explicit instructions to avoid proper nouns, technical terms, archaic words
- Add markdown formatting removal instructions to all AI prompts
- Specify game context in chat prompts for better responses
- Reduce maximum word length from 10 to 8 letters for easier guessing

src/aiService.js

@@ -44,7 +44,7 @@ class OpenRouterService {
           model: this.model,
           messages: [{
             role: 'system',
-            content: 'You provide clues for word puzzles. Follow the EXACT format requested. Be concise and direct. Never reveal the actual word. Stick to the word limits specified.'
+            content: 'You provide clues for word puzzles. Follow the EXACT format requested. Be concise and direct. Never reveal the actual word. Use plain text only - no bold, italics, asterisks, or markdown formatting. Stick to word limits.'
           }, {
             role: 'user',
             content: prompt
@@ -96,10 +96,10 @@ class OpenRouterService {
           model: this.model,
           messages: [{
             role: 'system',
-            content: 'You are an educational assistant that selects meaningful words from passages for cloze reading exercises. Select words that are important for comprehension and appropriate for the difficulty level.'
+            content: 'Select words for cloze reading exercises. Choose common, everyday words that students know. Avoid proper nouns (names, places), technical terms, archaic words, and words over 8 letters. Pick words students can guess from surrounding context.'
           }, {
             role: 'user',
-            content: `From this passage, select exactly ${count} meaningful words to create blanks for a cloze reading exercise. The words should be distributed throughout the passage and be important for understanding the text. Return ONLY the words as a JSON array, nothing else.
+            content: `Select exactly ${count} appropriate words for a cloze exercise. Choose common words students can guess from context. Avoid: proper nouns, technical terms, rare/archaic words, words over 8 letters. Return ONLY a JSON array of words.
 
 Passage: "${passage}"`
           }],

src/clozeGameEngine.js

@@ -292,7 +292,7 @@ class ClozeGame {
     const contentWordIndices = [];
     words.forEach((word, index) => {
       const cleanWord = word.toLowerCase().replace(/[^\w]/g, '');
-      if (cleanWord.length > 3 && !functionWords.has(cleanWord)) {
+      if (cleanWord.length > 3 && cleanWord.length <= 10 && !functionWords.has(cleanWord)) {
         contentWordIndices.push({ word: cleanWord, index });
       }
     });
@@ -511,6 +511,7 @@ class ClozeGame {
     return this.chatService.getSuggestedQuestions(blankId);
   }
 
+
   // Enhanced render method to include chat buttons
   renderClozeTextWithChat() {
     let html = this.clozeText;

src/conversationManager.js

@@ -104,13 +104,13 @@ class ChatService {
     const baseContext = `From "${bookTitle}" by ${author}: "${sentence}"`;
     
     const prompts = {
-      part_of_speech: `${baseContext}\n\nRespond with exactly: "This is a [noun/verb/adjective/adverb]" then add ONE simple clue about what type (e.g., "a thing", "an action", "describes something"). Maximum 15 words total. Do not reveal the word.`,
+      part_of_speech: `${baseContext}\n\nFor this cloze game, identify the part of speech needed in the blank. Respond exactly: "This is a [noun/verb/adjective/adverb]" then add ONE clue about its function. Maximum 15 words. No bold text or markdown.`,
       
-      sentence_role: `${baseContext}\n\nPoint to specific words around the blank. Format: "Look at 'the [word before] ____ [word after]' - what could [verb/function]?" Use only immediate neighboring words. Maximum 20 words.`,
+      sentence_role: `${baseContext}\n\nFor this cloze game, analyze the blank's sentence role. Format: "Look at [word before] ____ [word after] - what fits here?" Focus on immediate context. Maximum 18 words. No markdown.`,
       
-      word_category: `${baseContext}\n\nStart with exactly "This is abstract" or "This is concrete." Then add ONE example: "Like [feelings/objects]" or "Think [size/type]". Maximum 12 words total.`,
+      word_category: `${baseContext}\n\nFor this cloze game, categorize the missing word. Start exactly: "This is abstract" or "This is concrete" then add ONE example. Maximum 12 words. No bold or italics.`,
       
-      synonym: `${baseContext}\n\nFormat: "Try a word similar to [related word]" or "Another word for [concept]". Give ONE direct synonym or related concept only. Maximum 10 words.`
+      synonym: `${baseContext}\n\nFor this cloze game, give a synonym clue. Format: "Try a word similar to [related concept]" or "Another word for [meaning]". Maximum 10 words. No markdown formatting.`
     };
     
     return prompts[questionType] || `${baseContext}\n\nProvide a helpful hint about the missing word without revealing it.`;