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client/src/components/Refinity.tsx

@@ -854,6 +854,28 @@ const EditorPane: React.FC<{ source: string; initialTranslation: string; onBack:
       setTextareaHeight(`${height}px`);
     }
   }, [source]);
+  // Re-measure when fullscreen toggles (layout changes)
+  React.useEffect(() => {
+    const measure = () => {
+      if (sourceRef.current) {
+        const h = sourceRef.current.offsetHeight;
+        setTextareaHeight(`${h}px`);
+      }
+    };
+    // double rAF to wait for layout stabilization
+    requestAnimationFrame(() => requestAnimationFrame(measure));
+  }, [isFullscreen]);
+  // Re-measure on window resize
+  React.useEffect(() => {
+    const onResize = () => {
+      if (sourceRef.current) {
+        const h = sourceRef.current.offsetHeight;
+        setTextareaHeight(`${h}px`);
+      }
+    };
+    window.addEventListener('resize', onResize);
+    return () => window.removeEventListener('resize', onResize);
+  }, []);
 
   const save = async ()=>{
     setSaving(true);
@@ -924,8 +946,9 @@ const EditorPane: React.FC<{ source: string; initialTranslation: string; onBack:
             onChange={(e)=>setText(e.target.value)} 
             className="relative z-10 w-full px-4 py-3 border border-ui-border rounded-lg focus:outline-none focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 bg-white" 
             style={{ 
-              minHeight: textareaHeight, 
+              minHeight: textareaHeight,
               height: textareaHeight,
+              maxHeight: textareaHeight,
               resize: 'none',
               overflowY: 'auto'
             }}