diff --git a/src/components/astro/ColCentre.astro b/src/components/astro/ColCentre.astro
index 0158e07..1f1f25b 100644
--- a/src/components/astro/ColCentre.astro
+++ b/src/components/astro/ColCentre.astro
@@ -6,9 +6,9 @@ import ChatbotV2 from '../vue/ChatbotV2.vue';
 import IframeCarteAEP from './IframeCarteAEP.astro';
 import ScrollArticles from './ScrollArticles.astro';
 ---
-<div class="h-full grid grid-rows-2 gap-2 p-2">
+<div id="col-centre-grid" class="h-full grid grid-rows-2 gap-2 p-2">
   <!-- HAUT 50% : tabs Carte O / Chatbot -->
-  <section class="border border-neutral-200 rounded flex flex-col overflow-hidden bg-white">
+  <section id="col-centre-haut" class="border border-neutral-200 rounded flex flex-col overflow-hidden bg-white">
     <nav role="tablist" aria-label="Vues centrales" class="flex border-b border-neutral-200 px-1 pt-1">
       <button
         type="button"
@@ -56,6 +56,16 @@ import ScrollArticles from './ScrollArticles.astro';
     </div>
   </section>
 
+  <!-- Poignee repli zone HAUT - mobile only -->
+  <button
+    id="col-centre-poignee"
+    type="button"
+    aria-label="Replier ou deployer la Carte O"
+    class="md:hidden flex items-center justify-center h-6 bg-neutral-100 border-y border-neutral-200 cursor-pointer w-full -mt-2 -mb-2 hover:bg-neutral-200 transition-colors"
+  >
+    <span class="block w-8 h-0.5 bg-neutral-400 rounded-full"></span>
+  </button>
+
   <!-- BAS 50% : iframe carte AEP + scroll articles Substack (PC4) -->
   <section class="border border-neutral-200 rounded overflow-y-auto bg-white">
     <div class="h-full min-h-[60vh] md:min-h-[400px]">
@@ -66,6 +76,39 @@ import ScrollArticles from './ScrollArticles.astro';
 </div>
 
 <script>
+  // Poignee repli zone HAUT (mobile only, D.3)
+  const grid = document.getElementById('col-centre-grid');
+  const haut = document.getElementById('col-centre-haut');
+  const poignee = document.getElementById('col-centre-poignee');
+
+  const applyRepliState = (replie: boolean) => {
+    if (!grid || !haut) return;
+    if (replie) {
+      grid.classList.remove('grid-rows-2');
+      grid.style.gridTemplateRows = '0fr 1fr';
+      haut.style.overflow = 'hidden';
+      haut.style.minHeight = '0';
+      poignee?.setAttribute('aria-label', 'Deployer la Carte O');
+    } else {
+      grid.classList.add('grid-rows-2');
+      grid.style.gridTemplateRows = '';
+      haut.style.overflow = '';
+      haut.style.minHeight = '';
+      poignee?.setAttribute('aria-label', 'Replier la Carte O');
+    }
+  };
+
+  // Etat initial depuis sessionStorage
+  const savedRepli = sessionStorage.getItem('tf-haut-replie');
+  applyRepliState(savedRepli === 'true');
+
+  poignee?.addEventListener('click', () => {
+    const current = sessionStorage.getItem('tf-haut-replie') === 'true';
+    const next = !current;
+    sessionStorage.setItem('tf-haut-replie', String(next));
+    applyRepliState(next);
+  });
+
   // Tabs toggle.
   const tabs = document.querySelectorAll<HTMLButtonElement>('[data-tab]');
   const panels = document.querySelectorAll<HTMLElement>('[data-tab-panel]');
diff --git a/src/components/astro/HamburgerMenu.astro b/src/components/astro/HamburgerMenu.astro
index 0927d27..66121dc 100644
--- a/src/components/astro/HamburgerMenu.astro
+++ b/src/components/astro/HamburgerMenu.astro
@@ -5,7 +5,7 @@
 <button
   id="hamburger-trigger"
   type="button"
-  class="fixed top-4 left-4 z-50 p-3 bg-white/95 border border-neutral-200 rounded-lg shadow-md hover:bg-white transition-colors md:top-6 md:left-6"
+  class="fixed top-4 right-4 z-50 p-3 bg-white/95 border border-neutral-200 rounded-lg shadow-md hover:bg-white transition-colors md:top-6 md:right-6"
   aria-label="Ouvrir le menu"
   aria-expanded="false"
   aria-controls="hamburger-drawer"
diff --git a/src/components/astro/MobileTabBar.astro b/src/components/astro/MobileTabBar.astro
new file mode 100644
index 0000000..9d88bff
--- /dev/null
+++ b/src/components/astro/MobileTabBar.astro
@@ -0,0 +1,71 @@
+---
+// MobileTabBar - indicateur de colonne active sur mobile (V1.1-D.1)
+// Ecoute l'event "swipe-position-change" emis par SwipeContainer.vue
+// Affiche : Journal | Carte | Insta - colonne active surlignee
+---
+<nav
+  id="mobile-tab-bar"
+  aria-label="Navigation colonnes"
+  class="fixed top-0 left-0 right-0 z-30 h-11 bg-white border-b border-neutral-200 flex items-stretch justify-around md:hidden"
+>
+  <button
+    type="button"
+    data-tab-index="0"
+    class="mobile-tab flex-1 text-sm px-2 border-b-2 transition-colors"
+    aria-label="Aller au journal"
+  >
+    Journal
+  </button>
+  <button
+    type="button"
+    data-tab-index="1"
+    class="mobile-tab flex-1 text-sm px-2 border-b-2 transition-colors"
+    aria-label="Aller à la carte"
+  >
+    Carte
+  </button>
+  <button
+    type="button"
+    data-tab-index="2"
+    class="mobile-tab flex-1 text-sm px-2 border-b-2 transition-colors"
+    aria-label="Aller à Instagram"
+  >
+    Insta
+  </button>
+</nav>
+
+<script>
+  const tabs = document.querySelectorAll<HTMLButtonElement>('.mobile-tab');
+
+  function setActive(pos: number) {
+    tabs.forEach((tab, i) => {
+      const active = i === pos;
+      tab.classList.toggle('text-neutral-900', active);
+      tab.classList.toggle('font-medium', active);
+      tab.classList.toggle('border-neutral-900', active);
+      tab.classList.toggle('text-neutral-400', !active);
+      tab.classList.toggle('border-transparent', !active);
+    });
+  }
+
+  // Etat initial depuis sessionStorage (cle utilisee par SwipeContainer.vue)
+  const saved = sessionStorage.getItem('pc-position');
+  const initial = saved !== null && !Number.isNaN(Number(saved)) ? Number(saved) : 1;
+  setActive(initial);
+
+  // Ecoute les changements de position emis par SwipeContainer.vue
+  document.addEventListener('swipe-position-change', (e: Event) => {
+    const detail = (e as CustomEvent<{ pos: number }>).detail;
+    if (detail && typeof detail.pos === 'number') {
+      setActive(detail.pos);
+    }
+  });
+
+  // Les boutons de la tab bar declenchent un scroll via un event custom
+  tabs.forEach((tab) => {
+    tab.addEventListener('click', () => {
+      const idx = Number(tab.dataset.tabIndex);
+      document.dispatchEvent(new CustomEvent('mobile-tab-scroll', { detail: { pos: idx } }));
+    });
+  });
+</script>
diff --git a/src/components/vue/SwipeContainer.vue b/src/components/vue/SwipeContainer.vue
index 49b08f8..f0419c2 100644
--- a/src/components/vue/SwipeContainer.vue
+++ b/src/components/vue/SwipeContainer.vue
@@ -22,12 +22,17 @@ const resetFade = () => {
   }, 3000);
 };
 
+const emitPositionChange = (pos: number) => {
+  document.dispatchEvent(new CustomEvent('swipe-position-change', { detail: { pos } }));
+};
+
 onMounted(() => {
   if (!emblaApi.value) return;
   emblaApi.value.on('select', () => {
     if (!emblaApi.value) return;
     selectedIndex.value = emblaApi.value.selectedScrollSnap();
     sessionStorage.setItem('pc-position', String(selectedIndex.value));
+    emitPositionChange(selectedIndex.value);
     resetFade();
   });
   const saved = sessionStorage.getItem('pc-position');
@@ -35,6 +40,13 @@ onMounted(() => {
     const idx = Number(saved);
     if (!Number.isNaN(idx)) emblaApi.value.scrollTo(idx, false);
   }
+  // Ecoute les clics de la MobileTabBar
+  document.addEventListener('mobile-tab-scroll', (e: Event) => {
+    const detail = (e as CustomEvent<{ pos: number }>).detail;
+    if (detail && typeof detail.pos === 'number') {
+      emblaApi.value?.scrollTo(detail.pos);
+    }
+  });
   resetFade();
 });
 
diff --git a/src/layouts/BaseLayout.astro b/src/layouts/BaseLayout.astro
index bde0144..213d45c 100644
--- a/src/layouts/BaseLayout.astro
+++ b/src/layouts/BaseLayout.astro
@@ -9,7 +9,7 @@ interface Props {
 
 const {
   title = 'trans-former.fr',
-  description = 'Page-cerveau : journal, mindmap AEP, Insta',
+  description = "Architecture d'ecologie politique - journal, carte conceptuelle, manifeste",
 } = Astro.props;
 ---
 <!doctype html>
diff --git a/src/pages/index.astro b/src/pages/index.astro
index 71a5031..6e3ca82 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -7,10 +7,12 @@ import ColCentre from '../components/astro/ColCentre.astro';
 import ColInsta from '../components/astro/ColInsta.astro';
 import SwipeContainer from '../components/vue/SwipeContainer.vue';
 import HamburgerMenu from '../components/astro/HamburgerMenu.astro';
+import MobileTabBar from '../components/astro/MobileTabBar.astro';
 import PopupOnboarding from '../components/astro/PopupOnboarding.astro';
 ---
 <BaseLayout title="trans-former.fr">
   <HamburgerMenu />
+  <MobileTabBar />
   <PopupOnboarding />
 
   <!-- Desktop : grid 3 colonnes -->
@@ -20,8 +22,8 @@ import PopupOnboarding from '../components/astro/PopupOnboarding.astro';
     <aside class="border-l border-neutral-200 overflow-y-auto"><ColInsta /></aside>
   </div>
 
-  <!-- Mobile : SwipeContainer Vue island -->
-  <div class="md:hidden h-screen overflow-hidden">
+  <!-- Mobile : SwipeContainer Vue island - decale de 44px pour la tabbar -->
+  <div class="md:hidden overflow-hidden" style="height: calc(100dvh - 44px); margin-top: 44px;">
     <SwipeContainer client:load>
       <ColJournal slot="left" />
       <ColCentre slot="center" />
diff --git a/src/styles/global.css b/src/styles/global.css
index f1d8c73..60b87f6 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -1 +1,23 @@
 @import "tailwindcss";
+
+/* Typographie monospace - labels editoriaux (V1.1-G.1) */
+.font-mono-editorial,
+.hashtag-label,
+.nature-badge,
+.carte-o-label {
+  font-family: 'Courier New', Courier, monospace;
+}
+
+/* Corps de texte pages statiques (V1.1-G.2) */
+.prose-page {
+  font-size: 1.0625rem;
+  line-height: 1.75;
+  color: #374151;
+  max-width: 65ch;
+}
+.prose-page h1, .prose-page h2, .prose-page h3 {
+  color: #111827;
+  font-weight: 600;
+  line-height: 1.3;
+}
+