diff --git a/beango/index.html b/beango/index.html
index d85fb24..0bb75cf 100644
--- a/beango/index.html
+++ b/beango/index.html
@@ -332,8 +332,17 @@
                 </div>
             </details>
 
-            <!-- Buttons outside sections -->
-            <!-- REMOVED BUTTONS FROM HERE -->
+            <!-- Dangerous Reset All Button -->
+            <div class="border-t border-red-300 pt-4 mt-6">
+                <button onclick="resetAllSettings()" class="w-full bg-red-600 hover:bg-red-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:ring-2 focus:ring-red-500 focus:ring-offset-2">
+                    <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-5 h-5 inline-block mr-1 align-text-bottom">
+                        <path stroke-linecap="round" stroke-linejoin="round" d="M12 9v3.75m-9.303 3.376c-.866 1.5.217 3.374 1.948 3.374h14.71c1.73 0 2.813-1.874 1.948-3.374L13.949 3.378c-.866-1.5-3.032-1.5-3.898 0L2.697 16.126ZM12 15.75h.008v.008H12v-.008Z" />
+                    </svg>
+                    Reset ALL Settings to Defaults
+                </button>
+                <p class="mt-2 text-xs text-red-600 text-center">Warning: This will clear all saved customizations and board content.</p>
+            </div>
+
         </div>
     </div>
 
diff --git a/beango/js/beango.js b/beango/js/beango.js
index f7f03c7..91c029a 100644
--- a/beango/js/beango.js
+++ b/beango/js/beango.js
@@ -850,7 +850,7 @@ function shuffleArray(array) {
     return array;
 }
 
-// Function to reset settings and clear board
+// --- Function to reset ONLY board content/structure settings ---
 function resetSettings() {
     // Clear localStorage relevant ONLY to the board structure/content
     localStorage.removeItem(LS_BOARD_SIZE);
@@ -859,27 +859,6 @@ function resetSettings() {
     localStorage.removeItem(LS_MARKED_INDICES);
     localStorage.removeItem(LS_ORIGINAL_ITEMS); // User's raw input
 
-    // DO NOT clear these:
-    // localStorage.removeItem(LS_CONFIG_OPEN);
-    // localStorage.removeItem(LS_BACKGROUND_TYPE);
-    // localStorage.removeItem(LS_SOLID_COLOR);
-    // localStorage.removeItem(LS_GRADIENT_COLOR_1);
-    // localStorage.removeItem(LS_GRADIENT_COLOR_1_OPACITY);
-    // localStorage.removeItem(LS_GRADIENT_COLOR_2);
-    // localStorage.removeItem(LS_GRADIENT_COLOR_2_OPACITY);
-    // localStorage.removeItem(LS_GRADIENT_DIRECTION);
-    // localStorage.removeItem(LS_HEADER_TEXT);
-    // localStorage.removeItem(LS_HEADER_IMAGE_URL);
-    // localStorage.removeItem(LS_MARKED_STYLE_TYPE);
-    // localStorage.removeItem(LS_MARKED_COLOR);
-    // localStorage.removeItem(LS_MARKED_IMAGE_URL);
-    // localStorage.removeItem(LS_MARKED_COLOR_OPACITY);
-    // localStorage.removeItem(LS_CELL_BORDER_COLOR); // Keep style on board reset
-    // localStorage.removeItem(LS_CELL_BORDER_OPACITY);
-    // localStorage.removeItem(LS_CELL_BG_COLOR);
-    // localStorage.removeItem(LS_CELL_BG_OPACITY);
-    // localStorage.removeItem(LS_CELL_BG_IMAGE_URL);
-
     // Reset global variables for board content
     currentItems = [];
     displayedItems = [];
@@ -917,6 +896,31 @@ function resetSettings() {
     showNotification('Board settings reset. Generate a new board to apply.', 'success');
 }
 
+// --- Function to reset ALL application settings ---
+function resetAllSettings() {
+    if (confirm('Are you sure you want to reset ALL settings (styles, header, board content, etc.) to their defaults? This cannot be undone.')) {
+        const keysToRemove = [];
+        for (let i = 0; i < localStorage.length; i++) {
+            const key = localStorage.key(i);
+            if (key.startsWith('beango_')) {
+                keysToRemove.push(key);
+            }
+        }
+
+        keysToRemove.forEach(key => {
+            localStorage.removeItem(key);
+            console.log(`Removed setting: ${key}`); // Optional: log removed keys
+        });
+
+        showNotification('Resetting all settings to defaults...', 'warning', 1500); // Show brief message before reload
+
+        // Use a short delay before reload to ensure the notification is visible
+        setTimeout(() => {
+             location.reload();
+        }, 1600); // Slightly longer than notification duration
+    }
+}
+
 // --- Helper to get indices of marked cells ---
 function getMarkedIndices() {
     const markedCells = document.querySelectorAll('#bingo-board .bingo-cell.marked');