diff --git a/templates/base.html b/templates/base.html
index f9d8842..8f3f656 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -120,6 +120,16 @@
     {% endif %}
 
     <script>
+    // Prevent double-submit on all forms
+    document.querySelectorAll('form').forEach(function(form) {
+        form.addEventListener('submit', function() {
+            var btn = form.querySelector('button[type="submit"]');
+            if (btn) {
+                btn.disabled = true;
+                btn.style.opacity = '0.5';
+            }
+        });
+    });
     // Convert UTC timestamps to local timezone
     document.querySelectorAll('.js-localtime').forEach(function(el) {
         var dt = new Date(el.getAttribute('datetime'));