diff --git a/tests/production-ui-smoke.mjs b/tests/production-ui-smoke.mjs
new file mode 100644
index 0000000..05de96d
--- /dev/null
+++ b/tests/production-ui-smoke.mjs
@@ -0,0 +1,79 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs/promises';
+import {chromium,expect} from '@playwright/test';
+
+// Fetch real production assets, but use a synthetic SDK session and workspace.
+// All backend traffic is blocked: this verifies published UI, not server login,
+// and never reads or modifies a customer account or database.
+const base=new URL(process.env.TIMEWEB_BASE_URL||'https://app.caterium.ru');
+assert.equal(base.protocol,'https:');
+const output='production-ui-results';
+await fs.mkdir(output,{recursive:true});
+const browser=await chromium.launch();
+const results=[];
+try{
+ for(const width of [1440,390]){
+  const context=await browser.newContext({viewport:{width,height:900},serviceWorkers:'block'});
+  try{
+   await context.route('**/*',route=>{
+    const request=route.request(),url=new URL(request.url());
+    if(request.method()==='GET'&&url.origin===base.origin&&!url.pathname.startsWith('/api/'))return route.continue();
+    return route.abort();
+   });
+   await context.addInitScript(()=>{
+    const workspaceId='ui-smoke-workspace';
+    const user={id:'ui-smoke-user',email:'ui-smoke@example.invalid',email_confirmed_at:'2026-01-01T00:00:00Z'};
+    localStorage.setItem('sunCloudV2Config',JSON.stringify({workspaceId,localWorkspaceId:workspaceId,tenantStorageReady:true,autoSync:false}));
+    window.supabase={createClient:()=>({
+     auth:{onAuthStateChange:()=>({data:{subscription:{unsubscribe(){}}}}),getSession:async()=>({data:{session:{user}},error:null}),getUser:async()=>({data:{user},error:null})},
+     rpc:async name=>{
+      if(name==='sun_my_workspaces')return new Promise(resolve=>{window.finishUiSmokeWorkspace=()=>resolve({data:[{id:workspaceId,name:'UI verification',role:'admin',is_active:true,permissions:{}}],error:null});});
+      if(name==='sun_subscription_snapshot')return {data:{plan_id:'full',plan_name:'Full',status:'active',access_mode:'full',features:{}},error:null};
+      if(name==='caterium_trial_demo_status')return {data:{canInstall:false,canUpgrade:false},error:null};
+      if(name==='sun_is_platform_admin')return {data:false,error:null};
+      return {data:null,error:null};
+     },
+     channel:()=>({on(){return this;},subscribe(){return this;}}),removeChannel(){}
+    })};
+   });
+   const page=await context.newPage();
+   await page.goto(base.href,{waitUntil:'domcontentloaded',timeout:60000});
+   const gate=page.locator('#sunCloudAuthGateV3');
+   await expect(gate).toHaveAttribute('data-auth-state','loading',{timeout:20000});
+   await expect(gate.locator('h2')).toHaveText('Загружаю рабочую базу');
+   await expect(gate.locator('button:visible,input:visible,a:visible')).toHaveCount(0);
+   await expect(gate.locator('.sun-cloud-auth-error')).toBeHidden();
+   await expect(page.locator('body > header')).toBeHidden();
+   await page.screenshot({path:`${output}/loading-${width}.png`});
+   await page.evaluate(()=>window.finishUiSmokeWorkspace());
+   await expect(gate).toHaveCount(0,{timeout:20000});
+   await expect(page.locator('body > header')).toBeVisible();
+   const help=page.locator('#ctHelpNav');
+   await expect(help).toHaveClass(/sun-nav-button/);
+   await help.scrollIntoViewIfNeeded();
+   let icon=null;
+   if(width>900){
+    await expect.poll(()=>help.evaluate(el=>getComputedStyle(el,'::before').maskImage||getComputedStyle(el,'::before').webkitMaskImage)).toContain('data:image/svg+xml');
+    icon=await help.evaluate(el=>{
+     const peer=document.querySelector('header nav .nav-settings');
+     const size=node=>{const s=getComputedStyle(node,'::before');return {width:s.width,height:s.height,marginRight:s.marginRight,background:s.backgroundColor};};
+     const s=getComputedStyle(el,'::before');
+     return {help:size(el),peer:size(peer),mask:s.maskImage||s.webkitMaskImage};
+    });
+    assert.deepEqual(icon.help,icon.peer);
+    assert.match(decodeURIComponent(icon.mask),/<circle[^>]*r="9"/);
+    assert.match(decodeURIComponent(icon.mask),/M12 17h\.01/);
+    await page.locator('body > header').screenshot({path:`${output}/sidebar-${width}.png`});
+   }
+   await help.click();
+   await expect(page.locator('#ctHelpDialog')).toBeVisible();
+   await expect(page.locator('#ctHelpTitle')).toHaveText('Помощь в Caterium');
+   await expect.poll(()=>page.locator('#ctHelpResults details').count()).toBeGreaterThan(0);
+   await page.locator('#ctHelpClose').click();
+   await expect(page.locator('#ctHelpDialog')).not.toBeVisible();
+   results.push({width,quietLoading:true,automaticOpen:true,helpDialog:true,icon});
+   console.log(`PASS published UI ${width}px: quiet loading, automatic open, Help dialog${icon?', native question-circle icon':''}`);
+  }finally{await context.close();}
+ }
+ await fs.writeFile(`${output}/result.json`,JSON.stringify({base:base.href,checkedAt:new Date().toISOString(),backend:'mocked and network-blocked',results},null,2));
+}finally{await browser.close();}