diff --git a/public/js/text.js b/public/js/text.js
index 9dab122..aca2210 100644
--- a/public/js/text.js
+++ b/public/js/text.js
@@ -1,4 +1,4 @@
-const expandedNodeIds = new Set();
+const expandedChildByParent = new Map();
 let activeNodeId = null;
 
 document.addEventListener('DOMContentLoaded', () => {
@@ -102,7 +102,10 @@ function renderTree(nodes, textId, depth = 0) {
         const addBtn = document.createElement('button');
         addBtn.textContent = 'Add child';
         addBtn.className = 'add-child';
-        addBtn.addEventListener('click', () => toggleAddForm(li, node.id, textId));
+        addBtn.addEventListener(
+            'click',
+            () => toggleAddForm(li, node.id, node.parentNodeId, textId)
+        );
         li.appendChild(addBtn);
 
         const bulkBtn = document.createElement('button');
@@ -110,31 +113,32 @@ function renderTree(nodes, textId, depth = 0) {
         bulkBtn.className = 'bulk-add-children';
         bulkBtn.addEventListener(
             'click',
-            () => toggleBulkAddForm(li, node.id, textId)
+            () => toggleBulkAddForm(li, node.id, node.parentNodeId, textId)
         );
         li.appendChild(bulkBtn);
 
         if (node.children.length > 0) {
             const childUl = renderTree(node.children, textId, depth + 1);
             const childrenVisible =
-                expandedNodeIds.has(node.id) || depth === 0;
-            if (childrenVisible) {
-                expandedNodeIds.add(node.id);
-            }
+                depth === 0 ||
+                expandedChildByParent.get(node.parentNodeId) === node.id;
             childUl.style.display = childrenVisible ? '' : 'none';
 
             const toggleBtn = document.createElement('button');
             toggleBtn.className = 'toggle-children';
             toggleBtn.textContent = childrenVisible ? '▼' : '▶';
             toggleBtn.addEventListener('click', () => {
-                const isHidden = childUl.style.display === 'none';
-                childUl.style.display = isHidden ? '' : 'none';
-                toggleBtn.textContent = isHidden ? '▼' : '▶';
-                if (isHidden) {
-                    expandedNodeIds.add(node.id);
-                } else {
-                    expandedNodeIds.delete(node.id);
+                if (depth === 0) {
+                    return;
                 }
+                const expandedSibling =
+                    expandedChildByParent.get(node.parentNodeId);
+                if (expandedSibling === node.id) {
+                    expandedChildByParent.delete(node.parentNodeId);
+                } else {
+                    expandedChildByParent.set(node.parentNodeId, node.id);
+                }
+                fetchAndRenderNodes(textId);
             });
 
             li.appendChild(toggleBtn);
@@ -161,7 +165,7 @@ function closeAllAddForms() {
     });
 }
 
-function toggleAddForm(li, parentNodeId, textId) {
+function toggleAddForm(li, parentNodeId, grandparentId, textId) {
     const existing = li.querySelector('input.child-title');
     if (existing) {
         existing.remove();
@@ -184,7 +188,7 @@ function toggleAddForm(li, parentNodeId, textId) {
         const title = input.value.trim();
         if (!title) return;
 
-        expandedNodeIds.add(parentNodeId);
+        expandedChildByParent.set(grandparentId, parentNodeId);
         fetch('/api/nodes', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
@@ -211,7 +215,7 @@ function toggleAddForm(li, parentNodeId, textId) {
     input.focus();
 }
 
-function toggleBulkAddForm(li, parentNodeId, textId) {
+function toggleBulkAddForm(li, parentNodeId, grandparentId, textId) {
     const existing = li.querySelector('input.bulk-title');
     if (existing) {
         existing.remove();
@@ -242,7 +246,7 @@ function toggleBulkAddForm(li, parentNodeId, textId) {
         const count = parseInt(countInput.value);
         if (!titlePrefix || !count || count < 1) return;
 
-        expandedNodeIds.add(parentNodeId);
+        expandedChildByParent.set(grandparentId, parentNodeId);
         fetch('/api/nodes/bulk', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },