tweaks

public/learn-bitcoin/nodes.html

@@ -51,5 +51,16 @@
         <a href="#top" title="Back to Top">🔝</a>
     </div>
 
-
+<script>  
+// --- 2. Dropdown navigation ---------------------------------------------
+  window.navigateToSection = function (select) {
+    const sectionId = select.value;
+    if (sectionId) {
+      const section = document.getElementById(sectionId);
+      if (section) {
+        section.scrollIntoView({ behavior: 'smooth' });
+      }
+    }
+  };</script>
+  </body>
 </html>