diff --git a/components/WeeklyGrid.tsx b/components/WeeklyGrid.tsx
index c54fa68..2ae66d3 100644
--- a/components/WeeklyGrid.tsx
+++ b/components/WeeklyGrid.tsx
@@ -95,6 +95,7 @@ const WeeklyGrid: React.FC<WeeklyGridProps & { top50Mode: 'eu' | 'uk' }> = ({
     const [primaryMetric, setPrimaryMetric] = useState<'units' | 'revenue'>('units');
     const scrollContainerRef = useRef<HTMLDivElement>(null);
     const [hoveredTotalWeek, setHoveredTotalWeek] = useState<string | null>(null);
+    const [tooltipPos, setTooltipPos] = useState<{ x: number; y: number } | null>(null);
 
     // State for Column Filters (SKU, ASIN, Title, Line)
     const [columnFilters, setColumnFilters] = useState<Record<string, ColumnFilterCondition>>({});
@@ -799,8 +800,12 @@ const WeeklyGrid: React.FC<WeeklyGridProps & { top50Mode: 'eu' | 'uk' }> = ({
 
                                     return (
                                     <th key={week} className="p-3 text-sm font-black text-white text-center border-r border-white/10 relative"
-                                        onMouseEnter={() => setHoveredTotalWeek(week)}
-                                        onMouseLeave={() => setHoveredTotalWeek(null)}
+                                        onMouseEnter={(e) => {
+                                            const rect = (e.currentTarget as HTMLElement).getBoundingClientRect();
+                                            setTooltipPos({ x: rect.left + rect.width / 2, y: rect.top });
+                                            setHoveredTotalWeek(week);
+                                        }}
+                                        onMouseLeave={() => { setHoveredTotalWeek(null); setTooltipPos(null); }}
                                     >
                                         <div className="flex flex-col items-center">
                                             {primaryMetric === 'units' ? (
@@ -832,8 +837,10 @@ const WeeklyGrid: React.FC<WeeklyGridProps & { top50Mode: 'eu' | 'uk' }> = ({
                                             </div>
                                         </div>
 
-                                        {isHovered && (
-                                            <div className="absolute bottom-full left-1/2 -translate-x-1/2 mb-2 z-50 w-64 bg-slate-900 border border-white/20 rounded-xl shadow-2xl p-3 text-left pointer-events-none">
+                                        {isHovered && tooltipPos && (
+                                            <div className="pointer-events-none fixed z-[9999] w-64 bg-slate-900 border border-white/20 rounded-xl shadow-2xl p-3 text-left"
+                                                style={{ left: tooltipPos.x, top: tooltipPos.y - 8, transform: 'translate(-50%, -100%)' }}
+                                            >
                                                 <div className="text-[10px] font-black text-white/50 uppercase tracking-widest mb-2">{week}</div>
 
                                                 {/* Semana anterior */}