diff --git a/src/components/LayoutStep.tsx b/src/components/LayoutStep.tsx
index 7b54400..fcb5a66 100644
--- a/src/components/LayoutStep.tsx
+++ b/src/components/LayoutStep.tsx
@@ -18,22 +18,20 @@ type DragTarget =
 
 export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
   const svgRef = useRef<SVGSVGElement>(null);
-  
   const [mode, setMode] = useState<EditMode>('lines');
   
+  // States
   const [mousePos, setMousePos] = useState({ x: 0, y: 0 }); 
   const [isButtonHovered, setIsButtonHovered] = useState(false);
-  
   const [phantomMainAxis, setPhantomMainAxis] = useState<Axis | null>(null);
   const [hoveredMainSplit, setHoveredMainSplit] = useState<{ axis: Axis; index: number } | null>(null);
-
   const [hoveredCell, setHoveredCell] = useState<{ i: number; j: number } | null>(null);
   const [hoveredPartition, setHoveredPartition] = useState<{ id: string; cellKey: string } | null>(null);
   const [phantomPartition, setPhantomPartition] = useState<{ axis: Axis; offset: number } | null>(null);
-  
   const [selectedPartitionId, setSelectedPartitionId] = useState<string | null>(null);
   const [dragging, setDragging] = useState<DragTarget | null>(null);
 
+  // --- Safe Data (Защита от вылетов) ---
   const safeX = Array.isArray(splits?.x) ? splits.x : [];
   const safeY = Array.isArray(splits?.y) ? splits.y : [];
   const safePartitions = splits?.partitions || {};
@@ -48,6 +46,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
   const sortedX = useMemo(() => [0, ...safeX, 1].sort((a, b) => a - b), [safeX]);
   const sortedY = useMemo(() => [0, ...safeY, 1].sort((a, b) => a - b), [safeY]);
 
+  // --- Helper ---
   const getSelectedPartition = () => {
       if (!selectedPartitionId) return null;
       for (const key in safePartitions) {
@@ -58,6 +57,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
   };
   const selectedData = getSelectedPartition();
 
+  // --- ACTIONS ---
   const removeMainSplit = (axis: Axis, index: number) => {
     const newSplits = { ...splits, x: [...safeX], y: [...safeY] };
     newSplits[axis] = newSplits[axis].filter((_, i) => i !== index);
@@ -72,10 +72,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
       const current = safePartitions[key] || [];
       const newPart: Partition = {
           id: Math.random().toString(36).substr(2, 9),
-          axis,
-          offset,
-          height: config.drawer.height || 80,
-          rounded: false
+          axis, offset, height: config.drawer.height || 80, rounded: false
       };
       onChange({ ...splits, partitions: { ...safePartitions, [key]: [...current, newPart] } });
       setSelectedPartitionId(newPart.id);
@@ -94,6 +91,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
       setHoveredPartition(null);
   };
 
+  // --- MOUSE HANDLER ---
   const handleMouseMove = (e: React.MouseEvent) => {
     if (!svgRef.current) return;
     const rect = svgRef.current.getBoundingClientRect();
@@ -117,13 +115,13 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
             const cellY1 = sortedY[j]; const cellY2 = sortedY[j+1];
             
             let newOffset = 0;
-            if (pDrag.axis === 'x') {
-                newOffset = (nx - cellX1) / (cellX2 - cellX1);
-            } else {
-                newOffset = (ny - cellY1) / (cellY2 - cellY1);
-            }
+            if (pDrag.axis === 'x') { newOffset = (nx - cellX1) / (cellX2 - cellX1); } 
+            else { newOffset = (ny - cellY1) / (cellY2 - cellY1); }
+            
             newOffset = Math.max(0.05, Math.min(0.95, newOffset));
-            updatePartition(pDrag.cellKey, pDrag.id, { offset: newOffset });
+            if (!isNaN(newOffset)) {
+                updatePartition(pDrag.cellKey, pDrag.id, { offset: newOffset });
+            }
         }
         return;
     }
@@ -234,10 +232,11 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
 
   return (
     <div className="bg-slate-900 p-4 rounded-xl shadow-lg border border-slate-800 h-full flex flex-col relative overflow-hidden">
+      
       {/* HEADER */}
       <div className="flex justify-between items-center mb-2 z-20 shrink-0">
         <h2 className="text-lg font-bold flex items-center gap-2 text-primary">
-          <Grid size={20} /> 2. Редактор макета
+          <Grid size={20} /> 2. Макет
         </h2>
         <div className="flex bg-slate-800 p-1 rounded-lg border border-slate-700">
             <button onClick={() => { setMode('lines'); setSelectedPartitionId(null); }} className={`flex items-center gap-2 px-3 py-1.5 rounded-md text-xs font-bold transition-all ${mode === 'lines' ? 'bg-primary text-white shadow' : 'text-gray-400 hover:text-gray-200'}`}>Границы</button>
@@ -253,12 +252,12 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
           <MousePointer2 size={14} className="text-primary" />
           {mode === 'lines' ? (
               <div className="flex gap-3">
-                  <span><b className="text-blue-400">ЛКМ:</b> Создать/Тянуть линию</span>
+                  <span><b className="text-blue-400">ЛКМ:</b> Линия</span>
                   <span><b className="text-red-400">ПКМ:</b> Удалить</span>
               </div>
           ) : (
               <div className="flex gap-3">
-                  <span><b className="text-green-400">ЛКМ в ячейке:</b> Создать стенку</span>
+                  <span><b className="text-green-400">ЛКМ в ячейке:</b> Стенка</span>
                   <span><b className="text-purple-400">Драг:</b> Двигать</span>
                   <span><b className="text-red-400">2xЛКМ:</b> Удалить</span>
               </div>
@@ -289,13 +288,17 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
                       </defs>
                       <rect width="100%" height="100%" fill="url(#grid)" />
 
-                      {/* CELLS & PARTITIONS */}
+                      {/* --- CELLS & PARTITIONS --- */}
                       {sortedX.slice(0, -1).map((x1, i) => {
                           const x2 = sortedX[i + 1];
                           return sortedY.slice(0, -1).map((y1, j) => {
                               const y2 = sortedY[j + 1];
+                              // SAFETY CHECK: Если y2 не определен (такого быть не должно, но вдруг)
+                              if (y2 === undefined) return null;
+
                               const cellX = x1 * viewBoxW; const cellY = y1 * viewBoxH;
                               const cellW = (x2 - x1) * viewBoxW; const cellH = (y2 - y1) * viewBoxH;
+                              
                               const key = `${i}-${j}`;
                               const parts = safePartitions[key] || [];
                               const isHovered = hoveredCell?.i === i && hoveredCell?.j === j && mode === 'cells';
@@ -331,7 +334,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
                           });
                       })}
 
-                      {/* MAIN GRID */}
+                      {/* --- MAIN GRID X --- */}
                       {safeX.map((x, i) => {
                           const isHovered = hoveredMainSplit?.axis === 'x' && hoveredMainSplit.index === i;
                           return (
@@ -341,6 +344,8 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
                             </g>
                           );
                       })}
+
+                      {/* --- MAIN GRID Y --- */}
                       {safeY.map((y, i) => {
                           const isHovered = hoveredMainSplit?.axis === 'y' && hoveredMainSplit.index === i;
                           return (
@@ -358,7 +363,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
                 </div>
             </div>
 
-            {/* SIDEBAR */}
+            {/* --- SIDEBAR --- */}
             {mode === 'cells' && selectedData && (
                 <div className="absolute top-0 right-0 bottom-0 w-72 bg-slate-900 border-l border-slate-700 p-4 shadow-2xl flex flex-col z-30 animate-in slide-in-from-right duration-200">
                     <div className="flex justify-between items-center mb-6">
@@ -382,6 +387,7 @@ export const LayoutStep: React.FC<Props> = ({ config, splits, onChange }) => {
                 </div>
             )}
         </div>
+      </div>
     </div>
   );
 };
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