diff --git a/components/WeeklyGrid.tsx b/components/WeeklyGrid.tsx
index 7f99d5d..35f437e 100644
--- a/components/WeeklyGrid.tsx
+++ b/components/WeeklyGrid.tsx
@@ -1,4 +1,4 @@
-import React, { useMemo } from 'react';
+import React, { useMemo, useState } from 'react';
 import { CombinedKPIs } from '../types';
 import { pivotWeeklySalesData, WeeklyPivotRow } from '../services/dataProcessor';
 
@@ -6,23 +6,60 @@ interface WeeklyGridProps {
     data: CombinedKPIs[];
 }
 
+type SortConfig = {
+    key: string; // weekKey
+    direction: 'asc' | 'desc';
+} | null;
+
 const WeeklyGrid: React.FC<WeeklyGridProps> = ({ data }) => {
     const { rows, weeks } = useMemo(() => pivotWeeklySalesData(data), [data]);
 
-    // Group rows by 'line'
+    // Default sort: most recent week, descending
+    const [sortConfig, setSortConfig] = useState<SortConfig>(() => {
+        if (weeks.length > 0) {
+            return { key: weeks[0], direction: 'desc' };
+        }
+        return null;
+    });
+
+    const handleSort = (weekKey: string) => {
+        setSortConfig(prev => {
+            if (prev?.key === weekKey) {
+                return { key: weekKey, direction: prev.direction === 'asc' ? 'desc' : 'asc' };
+            }
+            return { key: weekKey, direction: 'desc' };
+        });
+    };
+
+    // Group and Sort rows
     const groupedRows = useMemo(() => {
         const groups: { [line: string]: WeeklyPivotRow[] } = {};
-        rows.forEach(row => {
+
+        // Clone and sort rows based on config
+        const sortedRows = [...rows];
+        if (sortConfig) {
+            sortedRows.sort((a, b) => {
+                const valA = a.unitsByWeek[sortConfig.key] || 0;
+                const valB = b.unitsByWeek[sortConfig.key] || 0;
+                if (sortConfig.direction === 'asc') {
+                    return valA - valB;
+                }
+                return valB - valA;
+            });
+        }
+
+        sortedRows.forEach(row => {
             const line = row.line || 'Uncategorized';
             if (!groups[line]) groups[line] = [];
             groups[line].push(row);
         });
+
         // Sort lines alphabetically
         return Object.keys(groups).sort().reduce((acc, line) => {
             acc[line] = groups[line];
             return acc;
         }, {} as { [line: string]: WeeklyPivotRow[] });
-    }, [rows]);
+    }, [rows, sortConfig]);
 
     // Calculate totals per week
     const weekTotals = useMemo(() => {
@@ -53,8 +90,17 @@ const WeeklyGrid: React.FC<WeeklyGridProps> = ({ data }) => {
                         <tr className="bg-slate-900 border-b border-white/10">
                             <th className="p-2 text-[9px] font-black text-slate-400 uppercase tracking-widest sticky left-0 z-30 bg-slate-900 border-r border-white/10 min-w-[200px]">Product Details</th>
                             {weeks.map(week => (
-                                <th key={week} className="p-2 text-[9px] font-black text-slate-400 uppercase tracking-widest text-center border-r border-white/10 w-24">
-                                    {week.split('-')[1]}/{week.split('-')[0].slice(-2)}
+                                <th
+                                    key={week}
+                                    className={`p-2 text-[9px] font-black uppercase tracking-widest text-center border-r border-white/10 w-24 cursor-pointer hover:bg-white/5 transition-colors select-none ${sortConfig?.key === week ? 'text-indigo-400 bg-white/[0.02]' : 'text-slate-400'}`}
+                                    onClick={() => handleSort(week)}
+                                >
+                                    <div className="flex flex-col items-center gap-1">
+                                        <span>{week.split('-')[1]}/{week.split('-')[0].slice(-2)}</span>
+                                        {sortConfig?.key === week && (
+                                            <span className="text-[10px]">{sortConfig.direction === 'asc' ? '↑' : '↓'}</span>
+                                        )}
+                                    </div>
                                 </th>
                             ))}
                         </tr>
@@ -91,9 +137,9 @@ const WeeklyGrid: React.FC<WeeklyGridProps> = ({ data }) => {
                                             const val = row.unitsByWeek[week] || 0;
                                             const prevVal = row.unitsByWeek[weeks[idx + 1]] || 0;
                                             return (
-                                                <td key={week} className="p-2 py-1.5 text-center border-r border-white/5 align-middle">
+                                                <td key={week} className={`p-2 py-1.5 text-center border-r border-white/5 align-middle ${sortConfig?.key === week ? 'bg-white/[0.01]' : ''}`}>
                                                     <div className="flex flex-col items-center justify-center">
-                                                        <span className={`text-xs font-bold ${val > 0 ? 'text-white' : 'text-slate-700'}`}>
+                                                        <span className={`text-xs font-bold ${val > 0 ? (sortConfig?.key === week ? 'text-indigo-400' : 'text-white') : 'text-slate-700'}`}>
                                                             {val > 0 ? val.toLocaleString('de-DE') : '-'}
                                                         </span>
                                                         {val > 0 && renderGrowth(val, prevVal)}