diff --git a/client/src/components/ui/calendar.tsx b/client/src/components/ui/calendar.tsx
index a637f3b..5a23667 100644
--- a/client/src/components/ui/calendar.tsx
+++ b/client/src/components/ui/calendar.tsx
@@ -28,9 +28,13 @@ function Calendar({
         ...props.modifiers,
       }}
       modifiersClassNames={{
-        weekend: "bg-gray-100 dark:bg-gray-800",
+        weekend: "weekend-day",
         ...props.modifiersClassNames,
       }}
+      modifiersStyles={{
+        weekend: { backgroundColor: '#f3f4f6' },
+        ...props.modifiersStyles,
+      }}
       classNames={{
         months: "flex flex-col sm:flex-row space-y-4 sm:space-x-4 sm:space-y-0",
         month: "space-y-4",
diff --git a/client/src/index.css b/client/src/index.css
index 518fc8f..994d90d 100644
--- a/client/src/index.css
+++ b/client/src/index.css
@@ -325,3 +325,29 @@ button[aria-current="date"]:focus-visible,
   outline: 2px solid #2563eb !important;
   outline-offset: 2px !important;
 }
+
+/* Style pour les weekends dans le calendrier - FOND GRIS CLAIR */
+.weekend-day,
+.rdp-day.weekend-day,
+.rdp-button.weekend-day {
+  background-color: #f3f4f6 !important; /* bg-gray-100 */
+}
+
+.dark .weekend-day,
+.dark .rdp-day.weekend-day,
+.dark .rdp-button.weekend-day {
+  background-color: #1f2937 !important; /* bg-gray-800 */
+}
+
+/* Forcer le style weekend sur tous les samedis et dimanches */
+[data-day-weekend="true"],
+button[data-day-weekend="true"],
+.rdp-day[data-day-weekend="true"] {
+  background-color: #f3f4f6 !important;
+}
+
+.dark [data-day-weekend="true"],
+.dark button[data-day-weekend="true"],
+.dark .rdp-day[data-day-weekend="true"] {
+  background-color: #1f2937 !important;
+}