diff --git a/public/data/carte-o.json b/public/data/carte-o.json
index 3aa3196..6b38838 100644
--- a/public/data/carte-o.json
+++ b/public/data/carte-o.json
@@ -1,6 +1,6 @@
 {
   "version": "1.1",
-  "generatedAt": "2026-05-11T18:07:36.883Z",
+  "generatedAt": "2026-05-11T22:29:46.546Z",
   "nodes": [
     {
       "id": "contrat-social-medecine-corps-social",
diff --git a/src/components/astro/ColCentre.astro b/src/components/astro/ColCentre.astro
index de8a75f..f2ffcea 100644
--- a/src/components/astro/ColCentre.astro
+++ b/src/components/astro/ColCentre.astro
@@ -3,6 +3,7 @@
 //          MILIEU : preview article (V1.2-P) - inseree au clic journal-item-click.
 //          BAS  : iframe carte AEP (toujours visible).
 // V1.3-D : ChatbotV2 retire du DOM (backlog V2). Pour reactivation -> reintroduire le tab + panel.
+// V1.4-C : cadre Carte O + bouton toggle desktop + drag fix (window listeners) + preview hydration (client:load) + transitions.
 import CarteOWrapper from '../vue/CarteOWrapper.vue';
 import EmbedDynamique from '../vue/EmbedDynamique.vue';
 import PreviewArticle from '../vue/PreviewArticle.vue';
@@ -19,11 +20,13 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
   data-preview-open="false"
   style="height: 100%; overflow-y: hidden;"
 >
-  <!-- HAUT (default flex-1 base 33%) : V1.3-D bandeau "Sommaire editorial" + legende + Carte O plein espace -->
+  <!-- HAUT (default flex-1 base 33%) : V1.3-D bandeau "Sommaire editorial" + legende + Carte O plein espace
+       V1.4-C1 : cadre 1px renforce (border-neutral-300) + transition height pour toggle collapse desktop -->
   <section
     id="col-centre-haut"
-    class="border border-neutral-200 rounded flex flex-col overflow-hidden bg-white"
-    style="min-height: 0; flex: 1 1 33%;"
+    class="rounded flex flex-col overflow-hidden bg-white"
+    style="min-height: 0; flex: 1 1 33%; border: 1px solid #CBD5E1; border-radius: 6px; transition: flex-basis 0.3s ease, min-height 0.3s ease;"
+    data-collapsed="false"
   >
     <!-- V1.3-D : bandeau header (titre gauche + legende droite) -->
     <header
@@ -33,32 +36,45 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
       <span class="text-xs truncate" style="color: #475569;">
         Sommaire éditorial d'architecture d'écologie politique
       </span>
-      <ul class="flex items-center gap-3 shrink-0 text-xs" style="color: #475569;" aria-label="Légende">
-        <li class="flex items-center gap-1.5">
-          <span
-            aria-hidden="true"
-            style="width: 8px; height: 8px; border-radius: 999px; background: #0F172A; display: inline-block;"
-          ></span>
-          <span>publié</span>
-        </li>
-        <li class="flex items-center gap-1.5">
-          <span
-            aria-hidden="true"
-            style="width: 8px; height: 8px; border-radius: 999px; background: transparent; border: 1px solid #0F172A; display: inline-block;"
-          ></span>
-          <span>à venir</span>
-        </li>
-        <li class="flex items-center gap-1.5">
-          <span
-            aria-hidden="true"
-            style="width: 8px; height: 8px; border-radius: 999px; background: #B45309; display: inline-block;"
-          ></span>
-          <span>projet</span>
-        </li>
-      </ul>
+      <div class="flex items-center gap-3 shrink-0">
+        <ul class="flex items-center gap-3 shrink-0 text-xs" style="color: #475569;" aria-label="Légende">
+          <li class="flex items-center gap-1.5">
+            <span
+              aria-hidden="true"
+              style="width: 8px; height: 8px; border-radius: 999px; background: #0F172A; display: inline-block;"
+            ></span>
+            <span>publié</span>
+          </li>
+          <li class="flex items-center gap-1.5">
+            <span
+              aria-hidden="true"
+              style="width: 8px; height: 8px; border-radius: 999px; background: transparent; border: 1px solid #0F172A; display: inline-block;"
+            ></span>
+            <span>à venir</span>
+          </li>
+          <li class="flex items-center gap-1.5">
+            <span
+              aria-hidden="true"
+              style="width: 8px; height: 8px; border-radius: 999px; background: #B45309; display: inline-block;"
+            ></span>
+            <span>projet</span>
+          </li>
+        </ul>
+        <!-- V1.4-C2 : bouton toggle Carte O desktop (replier/deployer la zone HAUT) -->
+        <button
+          id="col-centre-haut-toggle-desktop"
+          type="button"
+          aria-label="Replier la Carte O"
+          class="hidden md:inline-flex items-center justify-center w-5 h-5 text-neutral-500 hover:text-neutral-900 cursor-pointer transition-colors"
+          style="font-size: 10px; line-height: 1;"
+          title="Replier la Carte O"
+        >
+          <span id="col-centre-haut-toggle-icon">▼</span>
+        </button>
+      </div>
     </header>
 
-    <div class="flex-1 overflow-hidden relative">
+    <div id="col-centre-haut-body" class="flex-1 overflow-hidden relative" style="transition: opacity 0.25s ease;">
       <div id="panel-mindmap" class="absolute inset-0">
         <CarteOWrapper client:visible />
       </div>
@@ -86,16 +102,19 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
 
   <!-- MILIEU (V1.2-P) : preview article inseree entre Carte O et iframe AEP.
        Pas de border ici - PreviewArticle.vue gere son propre conteneur.
-       shrink-0 pour preserver sa taille auto, sinon flex pourrait l'ecraser. -->
+       shrink-0 pour preserver sa taille auto, sinon flex pourrait l'ecraser.
+       V1.4-E1 : client:load (vs client:visible) pour garantir hydration immediate des listeners
+                  'preview-open' / 'journal-item-click' (le v-if rendait l'observer aveugle). -->
   <div id="col-centre-preview-slot" class="shrink-0" style="display: contents;">
-    <PreviewArticle client:visible />
+    <PreviewArticle client:load />
   </div>
 
-  <!-- BAS (default flex-1 base 67%) : iframe carte AEP toujours visible -->
+  <!-- BAS (default flex-1 base 67%) : iframe carte AEP toujours visible
+       V1.4-E2 : transition flex-basis 0.3s ease (smooth quand preview ouvre/ferme) -->
   <section
     id="col-centre-bas"
     class="border border-neutral-200 rounded overflow-hidden bg-white"
-    style="min-height: 0; flex: 1 1 67%;"
+    style="min-height: 0; flex: 1 1 67%; transition: flex-basis 0.3s ease;"
   >
     <div class="h-full min-h-[60vh] md:min-h-[400px]">
       <EmbedDynamique client:visible />
@@ -104,11 +123,14 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
 </div>
 
 <script>
-  // Poignee repli zone HAUT (mobile only)
+  // Poignee repli zone HAUT (mobile only) + toggle desktop V1.4-C2
   const grid = document.getElementById('col-centre-grid');
   const haut = document.getElementById('col-centre-haut');
   const bas = document.getElementById('col-centre-bas');
   const poignee = document.getElementById('col-centre-poignee');
+  const toggleDesktop = document.getElementById('col-centre-haut-toggle-desktop');
+  const toggleDesktopIcon = document.getElementById('col-centre-haut-toggle-icon');
+  const hautBody = document.getElementById('col-centre-haut-body');
 
   // Sauvegarde flex-basis defaults pour restaure apres fermeture preview
   let defaultHautFlex = '1 1 33%';
@@ -140,6 +162,44 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
     applyRepliState(next);
   });
 
+  // V1.4-C2 : bouton toggle Carte O desktop (replier/deployer la zone HAUT).
+  // Etat distinct de l'etat mobile (clef differente) pour permettre persistance par device.
+  // Replie : flex 0 0 36px (juste le bandeau header reste visible), body masque.
+  // Deploye : restaure flex-basis precedent (default 33% ou drag-resize sauvegarde).
+  const applyDesktopCollapseState = (collapsed: boolean) => {
+    if (!haut) return;
+    if (grid && grid.dataset.previewOpen === 'true') return; // skip si preview ouverte (preview pilote la mise en page)
+    if (collapsed) {
+      haut.style.flex = '0 0 36px';
+      haut.dataset.collapsed = 'true';
+      if (hautBody) hautBody.style.opacity = '0';
+      if (toggleDesktopIcon) toggleDesktopIcon.textContent = '▶';
+      toggleDesktop?.setAttribute('aria-label', 'Deployer la Carte O');
+      toggleDesktop?.setAttribute('title', 'Deployer la Carte O');
+    } else {
+      // Restaure flex-basis precedent (drag-resize ou default)
+      haut.style.flex = defaultHautFlex;
+      haut.dataset.collapsed = 'false';
+      if (hautBody) hautBody.style.opacity = '1';
+      if (toggleDesktopIcon) toggleDesktopIcon.textContent = '▼';
+      toggleDesktop?.setAttribute('aria-label', 'Replier la Carte O');
+      toggleDesktop?.setAttribute('title', 'Replier la Carte O');
+    }
+  };
+
+  const savedDesktopCollapsed = sessionStorage.getItem('tf-carte-o-collapsed') === 'true';
+  if (savedDesktopCollapsed) {
+    // applique apres que defaultHautFlex soit defini (deja le cas)
+    applyDesktopCollapseState(true);
+  }
+
+  toggleDesktop?.addEventListener('click', () => {
+    const current = sessionStorage.getItem('tf-carte-o-collapsed') === 'true';
+    const next = !current;
+    sessionStorage.setItem('tf-carte-o-collapsed', String(next));
+    applyDesktopCollapseState(next);
+  });
+
   // V1.2-P : preview ouverte = container scrollable, Carte O et iframe AEP figes en vh.
   const applyPreviewState = (open: boolean) => {
     if (!grid || !haut || !bas) return;
@@ -196,19 +256,27 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
     let startHautH = 0;
     let containerH = 0;
 
+    // V1.4-D : fix drag handle qui ne se "decliquait" pas au mouseup.
+    // - Listeners poses sur window (vs document) pour capter les events meme si la souris quitte l'iframe
+    // - Ajout mouseleave/blur/pointerup pour robustesse cross-browser / cross-flow utilisateur
+    // - Desactive aussi les transitions CSS pendant le drag (pas de lag visuel) puis restaure
     dragHandle.addEventListener('mousedown', (e: MouseEvent) => {
       if (grid.dataset.previewOpen === 'true') return;
       if (sessionStorage.getItem('tf-haut-replie') === 'true') return;
+      if (sessionStorage.getItem('tf-carte-o-collapsed') === 'true') return;
       isDragging = true;
       startY = e.clientY;
       startHautH = haut.getBoundingClientRect().height;
       containerH = grid.getBoundingClientRect().height;
       document.body.style.cursor = 'row-resize';
       document.body.style.userSelect = 'none';
+      // Suspend transitions pendant drag pour responsivite
+      haut.style.transition = 'none';
+      bas.style.transition = 'none';
       e.preventDefault();
     });
 
-    document.addEventListener('mousemove', (e: MouseEvent) => {
+    const onMouseMove = (e: MouseEvent) => {
       if (!isDragging) return;
       const delta = e.clientY - startY;
       const newHautH = Math.min(Math.max(startHautH + delta, containerH * 0.2), containerH * 0.8);
@@ -216,24 +284,37 @@ import PreviewArticle from '../vue/PreviewArticle.vue';
       const basPct = 100 - hautPct;
       haut.style.flex = `1 1 ${hautPct.toFixed(1)}%`;
       bas.style.flex = `1 1 ${basPct.toFixed(1)}%`;
-    });
+    };
 
-    document.addEventListener('mouseup', () => {
-      if (isDragging) {
-        isDragging = false;
-        document.body.style.cursor = '';
-        document.body.style.userSelect = '';
-        const hf = haut.style.flex;
-        const bf = bas.style.flex;
-        if (hf) {
-          sessionStorage.setItem('tf-centre-haut-flex', hf);
-          defaultHautFlex = hf;
-        }
-        if (bf) {
-          sessionStorage.setItem('tf-centre-bas-flex', bf);
-          defaultBasFlex = bf;
-        }
+    const stopDrag = () => {
+      if (!isDragging) return;
+      isDragging = false;
+      document.body.style.cursor = '';
+      document.body.style.userSelect = '';
+      // Restaure transitions
+      haut.style.transition = 'flex-basis 0.3s ease, min-height 0.3s ease';
+      bas.style.transition = 'flex-basis 0.3s ease';
+      const hf = haut.style.flex;
+      const bf = bas.style.flex;
+      if (hf) {
+        sessionStorage.setItem('tf-centre-haut-flex', hf);
+        defaultHautFlex = hf;
       }
+      if (bf) {
+        sessionStorage.setItem('tf-centre-bas-flex', bf);
+        defaultBasFlex = bf;
+      }
+    };
+
+    // Listeners multiples sur window pour couvrir tous les cas (sortie iframe, perte focus, etc.)
+    window.addEventListener('mousemove', onMouseMove);
+    window.addEventListener('mouseup', stopDrag);
+    window.addEventListener('pointerup', stopDrag);
+    window.addEventListener('mouseleave', stopDrag);
+    window.addEventListener('blur', stopDrag);
+    // Si on rentre dans la fenetre sans bouton souris enfonce, on stoppe (l'user a relache hors-page)
+    window.addEventListener('mouseenter', (e: MouseEvent) => {
+      if (isDragging && e.buttons === 0) stopDrag();
     });
 
     // Restaurer position depuis sessionStorage
diff --git a/src/components/vue/CarteO.vue b/src/components/vue/CarteO.vue
index 794cd56..a17bf15 100644
--- a/src/components/vue/CarteO.vue
+++ b/src/components/vue/CarteO.vue
@@ -404,12 +404,14 @@ function render() {
       return -220
     }))
     .force('center', d3.forceCenter(width.value / 2, height.value / 2))
-    .force('x', d3.forceX<SimNode>(width.value / 2).strength(0.05))
-    .force('y', d3.forceY<SimNode>(height.value / 2).strength(0.05))
+    // V1.4-C1 : rappel horizontal/vertical renforce (0.05 -> 0.08) + collide +14 (vs +12)
+    // pour mieux contenir les nodes dans le cadre visible de la zone Carte O.
+    .force('x', d3.forceX<SimNode>(width.value / 2).strength(0.08))
+    .force('y', d3.forceY<SimNode>(height.value / 2).strength(0.08))
     .force('collide', d3.forceCollide<SimNode>().radius(d => {
       // V1.3-D : central traite comme zone large (rect 300x64 -> rayon equivalent 160)
       if (d.niveau === 0) return CENTRAL_COLLIDE_RADIUS
-      return getRadius(d) + 12
+      return getRadius(d) + 14
     }))
     .alphaDecay(0.025)
     .velocityDecay(0.4)
@@ -476,8 +478,9 @@ onMounted(() => {
     }
     if (simulation) {
       simulation.force('center', d3.forceCenter(width.value / 2, height.value / 2))
-      simulation.force('x', d3.forceX<SimNode>(width.value / 2).strength(0.05))
-      simulation.force('y', d3.forceY<SimNode>(height.value / 2).strength(0.05))
+      // V1.4-C1 : aligne avec la simulation initiale (strength 0.08)
+      simulation.force('x', d3.forceX<SimNode>(width.value / 2).strength(0.08))
+      simulation.force('y', d3.forceY<SimNode>(height.value / 2).strength(0.08))
       simulation.alpha(0.3).restart()
     }
   })
diff --git a/src/components/vue/PreviewArticle.vue b/src/components/vue/PreviewArticle.vue
index 24eab0f..007ee59 100644
--- a/src/components/vue/PreviewArticle.vue
+++ b/src/components/vue/PreviewArticle.vue
@@ -112,6 +112,7 @@ const formatDate = (iso: string) => {
 </script>
 
 <template>
+  <Transition name="preview-fade">
   <div v-if="mode" class="preview-article border border-neutral-200 rounded overflow-hidden bg-white flex flex-col">
 
     <!-- Header : reset + label (hashtag article OU "Manifeste") -->
@@ -199,4 +200,21 @@ const formatDate = (iso: string) => {
       </div>
     </template>
   </div>
+  </Transition>
 </template>
+
+<style scoped>
+/* V1.4-E2 : animation legere ouverture/fermeture preview (fade + slide-up subtil) */
+.preview-fade-enter-active,
+.preview-fade-leave-active {
+  transition: opacity 0.25s ease, transform 0.25s ease;
+}
+.preview-fade-enter-from {
+  opacity: 0;
+  transform: translateY(8px);
+}
+.preview-fade-leave-to {
+  opacity: 0;
+  transform: translateY(4px);
+}
+</style>