diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 479530a..1cba512 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -62,18 +62,41 @@ const Index = () => {
     }
   }, [setModel]);
 
-  const handleLoadDemo = useCallback(async () => {
-    setLoadingDemo(true);
+  const handleLoadCloud = useCallback(async () => {
+    const url = window.prompt('URL do modelo (GLB · OBJ · STL · IFC):', 'https://');
+    if (!url) return;
+    setLoadingCloud(true);
     try {
-      const { blob, fileName, fileSize } = await generateDemoBeamGLB();
-      const url = URL.createObjectURL(blob);
-      setModel({ fileName, fileSize, url });
-      toast.success('Modelo demo "IPE 200 — 1000mm" carregado!');
+      const fileName = url.split('/').pop()?.split('?')[0] || 'modelo-cloud';
+      const ext = getSupportedExtension(fileName);
+      if (!ext) {
+        toast.error('URL deve apontar para .GLB, .OBJ, .STL ou .IFC');
+        return;
+      }
+      const response = await fetch(url, { mode: 'cors' });
+      if (!response.ok) throw new Error(`HTTP ${response.status}`);
+      const buffer = await response.arrayBuffer();
+
+      let blob: Blob;
+      let outName = fileName;
+      let outSize = buffer.byteLength;
+      if (ext === 'glb') {
+        blob = new Blob([buffer], { type: 'model/gltf-binary' });
+      } else if (ext === 'ifc') {
+        const r = await convertIFCtoGLB(buffer, fileName);
+        blob = r.blob; outName = r.fileName; outSize = r.fileSize;
+      } else {
+        const r = await convertToGLB(buffer, ext, fileName);
+        blob = r.blob; outName = r.fileName; outSize = r.fileSize;
+      }
+      const blobUrl = URL.createObjectURL(blob);
+      setModel({ fileName: outName, fileSize: outSize, url: blobUrl });
+      toast.success(`"${outName}" carregado da nuvem (RAM)`);
     } catch (err) {
       console.error(err);
-      toast.error('Falha ao gerar modelo demo');
+      toast.error('Falha ao carregar da nuvem (verifique URL/CORS)');
     } finally {
-      setLoadingDemo(false);
+      setLoadingCloud(false);
     }
   }, [setModel]);