diff --git a/src/components/Map/markerManager.js b/src/components/Map/markerManager.js
index 560f96d..8c6b61f 100644
--- a/src/components/Map/markerManager.js
+++ b/src/components/Map/markerManager.js
@@ -20,15 +20,54 @@ export function clearAllMarkers(markersRef, expandedElRef) {
 }
 
 /**
- * Helper: hide/show all markers except one element
+ * Util: rectangles overlap?
  */
-function setOthersVisibility(markersRef, exceptEl, visible) {
+function rectsOverlap(a, b) {
+  return !(
+    a.right < b.left ||
+    a.left > b.right ||
+    a.bottom < b.top ||
+    a.top > b.bottom
+  );
+}
+
+/**
+ * Hide only markers that overlap the expanded card.
+ * - expandedEl: the marker root that is expanded
+ */
+export function applyOcclusionForExpanded(markersRef, expandedEl) {
+  if (!expandedEl) return;
+
+  const expandedCard = expandedEl.querySelector(".post-card");
+  if (!expandedCard) return;
+
+  const expandedRect = expandedCard.getBoundingClientRect();
+  const list = markersRef.current || [];
+
+  for (const item of list) {
+    const el = item?.el;
+    if (!el || el === expandedEl) continue;
+
+    // Compute marker rect (bubble + pointer)
+    const r = el.getBoundingClientRect();
+
+    const hide = rectsOverlap(expandedRect, r);
+
+    el.style.visibility = hide ? "hidden" : "visible";
+    el.style.pointerEvents = hide ? "none" : "auto";
+  }
+}
+
+/**
+ * Reset all markers visible
+ */
+export function clearOcclusion(markersRef) {
   const list = markersRef.current || [];
   for (const item of list) {
     const el = item?.el;
-    if (!el || el === exceptEl) continue;
-    el.style.visibility = visible ? "visible" : "hidden";
-    el.style.pointerEvents = visible ? "auto" : "none";
+    if (!el) continue;
+    el.style.visibility = "visible";
+    el.style.pointerEvents = "auto";
   }
 }
 
@@ -39,8 +78,8 @@ function setOthersVisibility(markersRef, exceptEl, visible) {
  *
  * Règles:
  * - 1 seul post ouvert à la fois
- * - clic sur la map => ferme (géré dans useMapCore)
- * - quand un post est ouvert => on cache les autres markers pour éviter les overlaps
+ * - clic sur la map => ferme (useMapCore)
+ * - quand un post est ouvert => on cache SEULEMENT les markers qui le recouvrent
  */
 export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
   const map = mapRef.current;
@@ -96,8 +135,8 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
       </div>
       <div class="post-pin-pointer-small"></div>
     `;
-    // remettre les autres markers visibles
-    setOthersVisibility(markersRef, root, true);
+    // bring back hidden markers
+    clearOcclusion(markersRef);
   }
 
   function renderExpanded() {
@@ -149,14 +188,16 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
       <div class="post-card-pointer"></div>
     `;
 
-    // cacher les autres markers pendant que celui-ci est ouvert
-    setOthersVisibility(markersRef, root, false);
+    // Wait a frame so DOM has final size, then hide only overlapping markers
+    requestAnimationFrame(() => {
+      applyOcclusionForExpanded(markersRef, root);
+    });
   }
 
   // état initial : compact
   renderCompact();
 
-  // IMPORTANT: garder une ref stable pour useMapCore (clic sur map => ferme)
+  // utilisé par useMapCore pour fermer via clic map
   root.__renderCompact = renderCompact;
 
   const marker = new maplibregl.Marker({
@@ -179,7 +220,7 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
       expandedElRef.current = null;
     }
 
-    // Toggle pour ce post
+    // Toggle
     const isExpanded = root.classList.contains("post-pin--expanded");
     if (isExpanded) {
       renderCompact();
diff --git a/src/components/Map/useMapCore.js b/src/components/Map/useMapCore.js
index d0b71b8..f41cc28 100644
--- a/src/components/Map/useMapCore.js
+++ b/src/components/Map/useMapCore.js
@@ -2,7 +2,7 @@ import { useEffect, useRef, useState } from "react";
 import maplibregl from "maplibre-gl";
 import { LAST_VIEW_KEY } from "./mapConfig";
 import { getViewFromMap } from "./mapGeo";
-import { clearAllMarkers } from "./markerManager";
+import { clearAllMarkers, applyOcclusionForExpanded } from "./markerManager";
 
 // renvoie le style MapLibre en fonction du thème
 function getBaseStyle(theme) {
@@ -98,6 +98,14 @@ export function useMapCore(theme) {
     map.addControl(new maplibregl.NavigationControl(), "top-right");
     mapRef.current = map;
 
+    // If a post is expanded, re-apply occlusion on zoom/move (only hides overlapping ones)
+    const reOcclude = () => {
+      const el = expandedElRef.current;
+      if (el) applyOcclusionForExpanded(markersRef, el);
+    };
+    map.on("move", reOcclude);
+    map.on("zoom", reOcclude);
+
     // Close expanded post when clicking on the map (outside markers)
     map.on("click", () => {
       const el = expandedElRef.current;