diff --git a/sync_calendar.py b/sync_calendar.py
index 5f4c6f5..67807bb 100644
--- a/sync_calendar.py
+++ b/sync_calendar.py
@@ -25,6 +25,20 @@ HEADERS = {
     "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) Unraid-Sync/1.0"
 }
 
+
+def normalize_url(url):
+    """Normalize URLs to make matching robust against trailing slash differences."""
+    return str(url).strip().rstrip("/")
+
+
+def find_calendar_by_url(calendars, target_url):
+    """Find a calendar whose URL matches the configured Baikal calendar URL."""
+    normalized_target = normalize_url(target_url)
+    for cal in calendars:
+        if normalize_url(cal.url) == normalized_target:
+            return cal
+    return None
+
 def delete_event(event):
     """Helper function to delete a single event."""
     try:
@@ -107,14 +121,22 @@ def sync():
                     print(f"   - {c.url}")
                 return
         else:
-            # Si no hay ID, usar el primero como antes
-            if calendars:
-                calendar = calendars[0]
-            else:
+            # Si no hay CALENDAR_ID, seleccionar por BAIKAL_URL
+            if not calendars:
                 print("!!! No se encontró ningún calendario en esa URL.")
                 return
 
+            calendar = find_calendar_by_url(calendars, BAIKAL_URL)
+            if not calendar:
+                print("!!! Error: No se encontró un calendario que coincida con BAIKAL_URL.")
+                print(f"   BAIKAL_URL configurado: {BAIKAL_URL}")
+                print("   Calendarios disponibles:")
+                for c in calendars:
+                    print(f"   - {c.url}")
+                return
+
         print(f"-> Calendario seleccionado: {calendar}")
+        print(f"-> URL del calendario seleccionado: {calendar.url}")
 
         # 3. Borrar eventos antiguos (NUEVO)
         delete_all_events(calendar)