diff --git a/src/components/Map/markerManager.js b/src/components/Map/markerManager.js
index 5379b5f..560f96d 100644
--- a/src/components/Map/markerManager.js
+++ b/src/components/Map/markerManager.js
@@ -8,28 +8,45 @@ export function clearAllMarkers(markersRef, expandedElRef) {
     for (const m of markersRef.current) {
       try {
         m.marker.remove();
-      } catch {}
+      } catch {
+        // ignore
+      }
     }
   }
   markersRef.current = [];
-  if (expandedElRef) expandedElRef.current = null;
+  if (expandedElRef) {
+    expandedElRef.current = null;
+  }
 }
 
-function shortText(s, max = 22) {
-  const t = String(s || "").trim();
-  if (!t) return "Post";
-  return t.length > max ? t.slice(0, max - 3) + "..." : t;
+/**
+ * Helper: hide/show all markers except one element
+ */
+function setOthersVisibility(markersRef, exceptEl, visible) {
+  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";
+  }
 }
 
 /**
  * Crée un marqueur pour un post :
- * - compact : bulle + pointe
- * - expanded : carte + pointe
+ * - état compact : petite bulle + pointe
+ * - état étendu : gros post (carte)
+ *
+ * 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
  */
 export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
   const map = mapRef.current;
   if (!map) return;
 
+  // --- coordonnées ---
   const lat =
     typeof post.lat === "number"
       ? post.lat
@@ -48,11 +65,12 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
       ? post.longitude
       : null;
 
-  if (lat == null || lon == null) return;
+  if (lat == null || lon == null) {
+    console.warn("post sans coordonnée:", post);
+    return;
+  }
 
   const title = (post.title || post.Title || "").trim() || "Untitled";
-  const titleShort = shortText(title, 22);
-
   const body =
     (post.snippet || post.Snippet || "").trim() ||
     (post.body || post.Body || "").trim() ||
@@ -66,7 +84,6 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
 
   const root = document.createElement("div");
   root.className = "post-pin post-pin--compact";
-  // base z-index (compact)
   root.style.zIndex = "1";
 
   function renderCompact() {
@@ -75,16 +92,17 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
     root.innerHTML = `
       <div class="post-pin-bubble">
         <div class="post-pin-dot"></div>
-        <div class="post-pin-text">${escapeHtml(titleShort)}</div>
+        <div class="post-pin-text">${escapeHtml(title)}</div>
       </div>
       <div class="post-pin-pointer-small"></div>
     `;
+    // remettre les autres markers visibles
+    setOthersVisibility(markersRef, root, true);
   }
 
   function renderExpanded() {
     root.className = "post-pin post-pin--expanded";
-    // ALWAYS on top
-    root.style.zIndex = "99999";
+    root.style.zIndex = "999999";
     root.innerHTML = `
       <div class="post-card">
         <div class="post-card-header">
@@ -99,15 +117,21 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
 
         <div class="post-card-main">
           <div class="post-card-media">
-            <div class="post-card-media-label">Image / Vidéo</div>
+            <div class="post-card-media-label">
+              Image / Vidéo
+            </div>
           </div>
 
           <div class="post-card-info">
-            <div class="post-card-title">${escapeHtml(title)}</div>
+            <div class="post-card-title">
+              ${escapeHtml(title)}
+            </div>
             <div class="post-card-meta">
               by ${escapeHtml(author)} · lat ${lat.toFixed(3)} · lon ${lon.toFixed(3)}
             </div>
-            <div class="post-card-body">${escapeHtml(body)}</div>
+            <div class="post-card-body">
+              ${escapeHtml(body)}
+            </div>
           </div>
         </div>
 
@@ -124,19 +148,17 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
       </div>
       <div class="post-card-pointer"></div>
     `;
+
+    // cacher les autres markers pendant que celui-ci est ouvert
+    setOthersVisibility(markersRef, root, false);
   }
 
-  function setExpanded(next) {
-    if (next) renderExpanded();
-    else renderCompact();
-  }
-
-  // expose pour useMapCore (close on map click)
-  root.__setExpanded = setExpanded;
-
-  // état initial
+  // état initial : compact
   renderCompact();
 
+  // IMPORTANT: garder une ref stable pour useMapCore (clic sur map => ferme)
+  root.__renderCompact = renderCompact;
+
   const marker = new maplibregl.Marker({
     element: root,
     anchor: "bottom",
@@ -149,24 +171,27 @@ export function createMarkerForPost(post, mapRef, markersRef, expandedElRef) {
   root.addEventListener("click", (ev) => {
     ev.stopPropagation();
 
-    // ferme l'autre expanded
+    // Fermer l'ancien gros post
     if (expandedElRef.current && expandedElRef.current !== root) {
-      expandedElRef.current.__setExpanded &&
-        expandedElRef.current.__setExpanded(false);
+      if (expandedElRef.current.__renderCompact) {
+        expandedElRef.current.__renderCompact();
+      }
       expandedElRef.current = null;
     }
 
+    // Toggle pour ce post
     const isExpanded = root.classList.contains("post-pin--expanded");
     if (isExpanded) {
-      setExpanded(false);
+      renderCompact();
       expandedElRef.current = null;
     } else {
-      setExpanded(true);
+      renderExpanded();
       expandedElRef.current = root;
     }
   });
 }
 
+/* petite fonction pour éviter d’injecter du HTML sale */
 function escapeHtml(str) {
   return String(str)
     .replace(/&/g, "&amp;")