diff --git a/src/components/ViewerControls.tsx b/src/components/ViewerControls.tsx
index 4cfa60c..b08a0ef 100644
--- a/src/components/ViewerControls.tsx
+++ b/src/components/ViewerControls.tsx
@@ -238,6 +238,49 @@ export function ViewerControls() {
         )}
       </div>
 
+      {/* Selection cluster */}
+      <div className="flex items-end gap-1.5">
+        <Button
+          variant={selectionMode ? 'default' : 'outline'}
+          size="sm"
+          className="gap-2 h-9"
+          onClick={() => setSelectionMode(!selectionMode)}
+          disabled={!activeModelId}
+          title="Clique nos elementos do modelo para selecionar (viga, chapa…)"
+        >
+          <MousePointerClick className="h-3.5 w-3.5" />
+          <span className="font-mono text-xs">
+            {selectionMode
+              ? hasSelection ? `${selectedElementKeys.size} sel.` : 'Selecionar…'
+              : 'Selecionar'}
+          </span>
+        </Button>
+
+        {hasSelection && (
+          <>
+            <Button variant="ghost" size="icon" className="h-9 w-9" onClick={hideSelectedElements} title="Esconder selecionados">
+              <EyeOff className="h-3.5 w-3.5 text-muted-foreground" />
+            </Button>
+            <Button variant="ghost" size="icon" className="h-9 w-9" onClick={isolateSelectedElements} title="Isolar selecionados (esconder o resto)">
+              <Focus className="h-3.5 w-3.5 text-primary" />
+            </Button>
+            <Button variant="ghost" size="icon" className="h-9 w-9" onClick={handleExportSelection} title="Exportar selecionados como GLB">
+              <Download className="h-3.5 w-3.5 text-primary" />
+            </Button>
+            <Button variant="ghost" size="icon" className="h-9 w-9" onClick={clearElementSelection} title="Limpar seleção">
+              <Undo2 className="h-3.5 w-3.5 text-muted-foreground" />
+            </Button>
+          </>
+        )}
+
+        {hasHiddenOrIsolated && (
+          <Button variant="ghost" size="sm" className="h-9 gap-1.5" onClick={showAllElements} title="Mostrar todos os elementos">
+            <Eye className="h-3.5 w-3.5" />
+            <span className="font-mono text-xs">Mostrar tudo</span>
+          </Button>
+        )}
+      </div>
+
 
       {/* Screenshot */}
       <Button