Add: spot the difference game in web app

Author: KhushiVadadoriya

web-app/index.html

@@ -134,6 +134,13 @@ <h3>Simon Says</h3>
                     <button class="btn-play">Play Now</button>
                 </div>
 
+                <div class="project-card" data-category="games" data-project="spot-the-difference" data-tags="games">
+                    <div class="card-icon">🔍</div>
+                    <h3>Spot the Difference</h3>
+                    <p>Find all the hidden differences between two scenes!</p>
+                    <button class="btn-play">Play Now</button>
+                </div>
+
                 <!-- Math Tools -->
                 <div class="project-card" data-category="math" data-project="fibonacci" data-tags="math,sequence,series,loops,recursion">
                     <div class="card-icon">✨</div>

web-app/js/main.js

@@ -62,11 +62,14 @@ backToTopButton.addEventListener('click', () => {
 
 // Category Filtering
 const tabs = document.querySelectorAll('.tab');
+const projectCards = document.querySelectorAll('.project-card');
 
-// Category Filtering (tabs)
+let recentSearches = JSON.parse(localStorage.getItem('recentSearches') || '[]');
+let currentSearchQuery = '';
+let selectedSuggestionIndex = -1;
+let currentCategory = 'all';
 
-const projectCards = document.querySelectorAll('.project-card');
-const tabs = document.querySelectorAll('.tab');
+// Category Filtering (tabs)
 const searchInput = document.getElementById('projectSearch');
 const searchClear = document.getElementById('searchClear');
 const searchDropdown = document.getElementById('searchDropdown');
@@ -171,10 +174,12 @@ function highlightMatch(text, query) {
 
 // Render recent searches
 function renderRecentSearches() {
+    if (!recentSearchesSection) return;
+    
     if (recentSearches.length === 0) {
         recentSearchesSection.style.display = 'none';
-        tipsSection.style.display = 'block';
-        resultsSection.style.display = 'none';
+        if (tipsSection) tipsSection.style.display = 'block';
+        if (resultsSection) resultsSection.style.display = 'none';
         return;
     }