diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptEdit.razor b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptEdit.razor
index f7dd8ab2..0010d172 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptEdit.razor
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/ScriptEdit.razor
@@ -13,7 +13,6 @@
 @using ZB.MOM.WW.OtOpcUa.Configuration.Entities
 @inject IDbContextFactory<OtOpcUaConfigDbContext> DbFactory
 @inject NavigationManager Nav
-@inject IJSRuntime JS
 
 <div class="d-flex justify-content-between align-items-center mb-3">
     <h4 class="mb-0">@(IsNew ? "New script" : "Edit script")</h4>
@@ -57,15 +56,8 @@ else
         <section class="panel rise mt-3">
             <div class="panel-head">Source</div>
             <div style="padding:1rem">
-                @* The textarea stays in the DOM and remains Blazor's source of truth. Monaco
-                   mounts a <div> beside it (textarea hides), and the loader's onDidChangeModelContent
-                   handler mirrors edits back into the textarea + fires the input event so @bind
-                   picks them up. Falls back to the textarea gracefully if Monaco's CDN is
-                   unreachable (air-gapped deployments — see monaco-loader.js). *@
-                <InputTextArea id="script-source" @bind-Value="_form.SourceCode"
-                               class="form-control form-control-sm mono" rows="20"
-                               placeholder="// C# expression body" />
-                <div class="form-text">SHA-256 hash is computed automatically on save. Monaco editor attaches over the textarea on render.</div>
+                    <MonacoEditor @bind-Value="_form.SourceCode" Height="420px" />
+                <div class="form-text">SHA-256 hash is computed automatically on save.</div>
             </div>
         </section>
 
@@ -110,24 +102,6 @@ else
         _loaded = true;
     }
 
-    protected override async Task OnAfterRenderAsync(bool firstRender)
-    {
-        if (!firstRender || !_loaded) return;
-        // Inject loader once, then attach over the textarea. Failures are silent — the page
-        // is fully usable via the underlying textarea if Monaco's CDN is unreachable.
-        try
-        {
-            await JS.InvokeVoidAsync("eval", "if (!document.querySelector('script[data-otopcua=monaco-loader]')) { var s=document.createElement('script'); s.src='/_content/ZB.MOM.WW.OtOpcUa.AdminUI/js/monaco-loader.js'; s.dataset.otopcua='monaco-loader'; document.head.appendChild(s); }");
-            // Wait a tick for the loader IIFE to register window.otOpcUaScriptEditor, then attach.
-            await Task.Delay(50);
-            await JS.InvokeVoidAsync("otOpcUaScriptEditor.attach", "script-source");
-        }
-        catch
-        {
-            // Textarea remains the editor — no-op.
-        }
-    }
-
     private async Task SubmitAsync()
     {
         _busy = true; _error = null;
diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/wwwroot/js/monaco-loader.js b/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/wwwroot/js/monaco-loader.js
deleted file mode 100644
index c88822a0..00000000
--- a/src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/wwwroot/js/monaco-loader.js
+++ /dev/null
@@ -1,59 +0,0 @@
-// Phase 7 Stream F — Monaco editor loader for ScriptEditor.razor.
-// Progressive enhancement: the textarea is authoritative until Monaco attaches;
-// after attach, Monaco syncs back into the textarea on every change so Blazor's
-// @bind still sees the latest value.
-
-(function () {
-    if (window.otOpcUaScriptEditor) return;
-
-    const MONACO_CDN = 'https://cdn.jsdelivr.net/npm/monaco-editor@0.52.2/min/vs';
-    let loaderPromise = null;
-
-    function ensureLoader() {
-        if (loaderPromise) return loaderPromise;
-        loaderPromise = new Promise((resolve, reject) => {
-            const script = document.createElement('script');
-            script.src = `${MONACO_CDN}/loader.js`;
-            script.onload = () => {
-                window.require.config({ paths: { vs: MONACO_CDN } });
-                window.require(['vs/editor/editor.main'], () => resolve(window.monaco));
-            };
-            script.onerror = () => reject(new Error('Monaco CDN unreachable'));
-            document.head.appendChild(script);
-        });
-        return loaderPromise;
-    }
-
-    window.otOpcUaScriptEditor = {
-        attach: async function (textareaId) {
-            const ta = document.getElementById(textareaId);
-            if (!ta) return;
-            const monaco = await ensureLoader();
-
-            // Mount Monaco over the textarea. The textarea stays in the DOM as the
-            // source of truth for Blazor's @bind — Monaco mirrors into it on every
-            // keystroke so server-side state stays in sync.
-            const host = document.createElement('div');
-            host.style.height = '340px';
-            host.style.border = '1px solid #ced4da';
-            host.style.borderRadius = '0.25rem';
-            ta.style.display = 'none';
-            ta.parentNode.insertBefore(host, ta);
-
-            const editor = monaco.editor.create(host, {
-                value: ta.value,
-                language: 'csharp',
-                theme: 'vs',
-                automaticLayout: true,
-                fontSize: 13,
-                minimap: { enabled: false },
-                scrollBeyondLastLine: false,
-            });
-
-            editor.onDidChangeModelContent(() => {
-                ta.value = editor.getValue();
-                ta.dispatchEvent(new Event('input', { bubbles: true }));
-            });
-        },
-    };
-})();