diff --git a/sync_manager.py b/sync_manager.py
index 4676fd73..97cf24a8 100644
--- a/sync_manager.py
+++ b/sync_manager.py
@@ -464,4 +464,113 @@ class SyncManager:
             else:
                 self.logger.info("--> Ergebnis: Werte sind IDENTISCH.")
 
-        self.logger.info("========== ENDE SYNC-DEBUG-MODUS ==========")
\ No newline at end of file
+        self.logger.info("========== ENDE SYNC-DEBUG-MODUS ==========")
+    
+    def simulate_sync(self):
+        """
+        Führt eine reine "Trockenlauf"-Analyse des Sync-Prozesses durch, ohne Daten zu schreiben.
+        Gibt einen detaillierten Bericht über alle potenziellen Änderungen aus.
+        """
+        self.logger.info("========== START SYNC-SIMULATION ==========")
+        if not self._load_data():
+            self.logger.error("Simulation abgebrochen, da das Laden der Daten fehlschlug.")
+            return
+
+        # Die Analyse-Logik ist identisch zum echten Lauf
+        d365_ids = set(self.d365_df['CRM ID'].dropna())
+        gsheet_ids = set(self.gsheet_df['CRM ID'].dropna())
+        new_ids = d365_ids - gsheet_ids
+        existing_ids = d365_ids.intersection(gsheet_ids)
+        
+        simulation_results = defaultdict(list)
+        
+        # 1. Bestehende Accounts analysieren
+        if existing_ids:
+            d365_indexed = self.d365_df.set_index('CRM ID')
+            gsheet_to_update_df = self.gsheet_df[self.gsheet_df['CRM ID'].isin(existing_ids)]
+
+            for _, gsheet_row in gsheet_to_update_df.iterrows():
+                crm_id = gsheet_row['CRM ID']
+                d365_row = d365_indexed.loc[crm_id]
+                
+                changes = []
+                conflicts = []
+                needs_reeval = False
+
+                for gsheet_col in self.d365_wins_cols:
+                    d365_val = str(d365_row[gsheet_col]).strip()
+                    gsheet_val = str(gsheet_row[gsheet_col]).strip()
+                    
+                    trigger_update = False
+                    if gsheet_col == 'CRM Land':
+                        d365_code_lower, gsheet_val_lower = d365_val.lower(), gsheet_val.lower()
+                        d365_translated = Config.COUNTRY_CODE_MAP.get(d365_code_lower, d365_code_lower).lower()
+                        if gsheet_val_lower != d365_code_lower and gsheet_val_lower != d365_translated:
+                            trigger_update = True
+                    elif gsheet_col == 'CRM Anzahl Techniker':
+                        semantically_empty = ['', '0', '-1']
+                        if d365_val in semantically_empty and gsheet_val in semantically_empty: pass
+                        elif d365_val != gsheet_val: trigger_update = True
+                    elif gsheet_col == 'CRM Branche':
+                        if gsheet_row['Chat Vorschlag Branche'] == '' and d365_val != gsheet_val:
+                            trigger_update = True
+                    elif gsheet_col == 'CRM Umsatz':
+                        if gsheet_row['Wiki Umsatz'] == '' and d365_val != gsheet_val:
+                            trigger_update = True
+                    elif gsheet_col == 'CRM Anzahl Mitarbeiter':
+                        if gsheet_row['Wiki Mitarbeiter'] == '' and d365_val != gsheet_val:
+                            trigger_update = True
+                    elif gsheet_col == 'CRM Beschreibung':
+                        if gsheet_row['Website Zusammenfassung'] == '' and d365_val != gsheet_val:
+                            trigger_update = True
+                    else:
+                        if d365_val != gsheet_val: trigger_update = True
+                    
+                    if trigger_update:
+                        changes.append(f"UPDATE: {gsheet_col} von '{gsheet_val}' zu '{d365_val}'")
+                        needs_reeval = True
+
+                for gsheet_col in self.smart_merge_cols:
+                    d365_val = str(d365_row.get(gsheet_col, '')).strip()
+                    gsheet_val = str(gsheet_row.get(gsheet_col, '')).strip()
+                    if d365_val and gsheet_val and d365_val != gsheet_val:
+                        conflicts.append(f"CONFLICT: {gsheet_col} (D365='{d365_val}' vs GSheet='{gsheet_val}')")
+
+                if changes or conflicts:
+                    account_name = d365_row.get('CRM Name', 'Unbekannt')
+                    key = f"ACCOUNT: {crm_id} ({account_name})"
+                    simulation_results[key].extend(changes)
+                    simulation_results[key].extend(conflicts)
+                    if needs_reeval:
+                        simulation_results[key].append("AKTION: ReEval Flag würde gesetzt werden.")
+
+        # 2. Den Bericht generieren und ausgeben
+        self.logger.info("\n\n" + "="*80)
+        self.logger.info(" S Y N C   S I M U L A T I O N S B E R I C H T")
+        self.logger.info("="*80)
+        
+        self.logger.info(f"\n--- ZUSAMMENFASSUNG ---")
+        self.logger.info(f"Accounts im D365-Export: {len(d365_ids)}")
+        self.logger.info(f"Accounts im Google Sheet: {len(gsheet_ids)}")
+        self.logger.info(f"--> {len(new_ids)} NEUE Accounts würden hinzugefügt.")
+        self.logger.info(f"--> {len(simulation_results)} BESTEHENDE Accounts würden geändert.")
+        self.logger.info(f"--> {len(existing_ids) - len(simulation_results)} bestehende Accounts bleiben UNVERÄNDERT.")
+        self.logger.info("-" * 80)
+        
+        if new_ids:
+            self.logger.info(f"\n--- {len(new_ids)} NEUE ACCOUNTS ---")
+            new_accounts_df = self.d365_df[self.d365_df['CRM ID'].isin(new_ids)]
+            for _, row in new_accounts_df.head(20).iterrows(): # Zeige maximal die ersten 20
+                self.logger.info(f"  - NEU: {row['CRM ID']} ({row['CRM Name']})")
+            if len(new_ids) > 20: self.logger.info("  - ... und weitere.")
+        
+        if simulation_results:
+            self.logger.info(f"\n--- {len(simulation_results)} ZU AKTUALISIERENDE ACCOUNTS ---")
+            for account, details in simulation_results.items():
+                self.logger.info(account)
+                for detail in details:
+                    self.logger.info(f"  - {detail}")
+        
+        self.logger.info("\n" + "="*80)
+        self.logger.info(" S I M U L A T I O N   B E E N D E T")
+        self.logger.info("="*80)
\ No newline at end of file