diff --git a/README.md b/README.md
index fe2987e..969d459 100644
--- a/README.md
+++ b/README.md
@@ -21,15 +21,15 @@ Aucune génération de code direct n'est effectuée : seules des **explications,
 
 Reproduire une **table ronde d'IA spécialistes**, chaque agent IA représentant un rôle spécifique :
 
-- Architecte logiciel
-- Développeur backend
-- Développeur frontend
-- Designer UI/UX
-- Data engineer
-- Chef de projet
-- Éventuellement d'autres rôles selon la complexité du prompt.
+- Lead Architect (Architecte logiciel)
+- Backend Engineer (Développeur backend)
+- Frontend Engineer (Développeur frontend)
+- UI Designer (Designer UI/UX)
+- DevOps Engineer (Ingénieur DevOps)
+- Product Manager (Chef de projet)
+- Security Specialist (Spécialiste sécurité)
 
-Cependant, l'aspect le plus crucial de ces IA réside dans leur capacité à **échanger, négocier, voire s'opposer** pour déterminer collectivement la meilleure approche à adopter.
+L'aspect le plus crucial de ces IA réside dans leur capacité à **collaborer itérativement** pour améliorer collectivement la spécification architecturale jusqu'à convergence naturelle (quand plus aucune amélioration n'est proposée).
 
 ---
 
@@ -96,16 +96,17 @@ graph TD
 
 ### Interface et visualisation
 - **Saisie de prompt** décrivant le projet souhaité
-- **Visualisation en temps réel** des échanges entre agents via WebSocket
-- **Affichage structuré** des propositions avec justifications et niveaux de confiance
-- **Rendu automatique** de diagrammes Mermaid intégrés dans les réponses
-- **Indicateurs de progression** et statuts du débat
+- **Upload optionnel** de fichiers contexte (MD/TXT)
+- **Visualisation en temps réel** des modifications via WebSocket
+- **Timeline d'évolution** du document avec historique complet
+- **Affichage interactif** du document Markdown final
+- **Indicateurs de progression** et statuts du session
 
 ### Architecture et stockage
-- **API REST** pour gestion des débats et récupération des résultats
-- **WebSocket** pour streaming temps réel des réponses des agents
-- **Base SQLite** pour persistance des débats et historique
-- **Gestion d'erreurs** avec fallbacks et réponses de secours
+- **API REST** pour gestion des sessions collaboratives
+- **WebSocket** pour streaming temps réel des modifications d'agents
+- **Base SQLite** pour persistance des sessions, versions et historique complet
+- **Versioning intelligent** : Chaque modification crée une version avec métadonnées (agent, raison, round)
 
 ---
 
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index e46da8f..ef26d65 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -3,6 +3,7 @@ import { ref } from 'vue'
 import { useCollaborationStore } from './stores/collaboration'
 import CollaborativeInput from './components/CollaborativeInput.vue'
 import CollaborativeSession from './components/CollaborativeSession.vue'
+import TimelinePanel from './components/TimelinePanel.vue'
 import NetworkStatus from './components/NetworkStatus.vue'
 
 const collaborationStore = useCollaborationStore()
@@ -25,124 +26,76 @@ function startNewCollaboration() {
   <div class="app">
     <NetworkStatus />
 
-    <!-- Input Mode -->
-    <div v-if="!showSession">
+    <!-- Input Mode - Centered Full Screen -->
+    <div v-if="!showSession" class="input-container">
       <CollaborativeInput @session-created="handleCollaborationCreated" />
     </div>
 
-    <!-- Session Mode -->
-    <div v-else>
-      <button @click="startNewCollaboration" class="new-session-btn">
-        New Session
-      </button>
+    <!-- Session Mode - Two Column Layout -->
+    <div v-else class="session-layout">
+      <!-- Left Sidebar: Timeline -->
+      <div class="timeline-sidebar">
+        <div class="sidebar-header">
+          <h2>Session Progress</h2>
+          <button @click="startNewCollaboration" class="new-btn-small" title="Start new session">
+            R
+          </button>
+        </div>
 
-      <CollaborativeSession
-        v-if="currentSessionId"
-        :session-id="currentSessionId"
-        @session-completed="startNewCollaboration"
-      />
+        <!-- Timeline Panel -->
+        <TimelinePanel />
+      </div>
+
+      <!-- Right Content: Session -->
+      <div class="main-content">
+        <CollaborativeSession
+          v-if="currentSessionId"
+          :session-id="currentSessionId"
+          @session-completed="startNewCollaboration"
+        />
+      </div>
     </div>
   </div>
 </template>
 
 <style>
-* {
-  margin: 0;
-  padding: 0;
-  box-sizing: border-box;
-}
-
-body {
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
-  color: #2c3e50;
-}
-
-#app {
-  min-height: 100vh;
-}
-
 @keyframes gradient-shift {
-  0% {
-    background-position: 0% 50%;
-  }
-  50% {
-    background-position: 100% 50%;
-  }
-  100% {
-    background-position: 0% 50%;
-  }
+  0% { background-position: 0% 50%; }
+  50% { background-position: 100% 50%; }
+  100% { background-position: 0% 50%; }
 }
 
 @keyframes float1 {
-  0%, 100% {
-    transform: translate(0, 0) rotate(0deg);
-    opacity: 0.03;
-  }
-  25% {
-    transform: translate(100px, -100px) rotate(90deg);
-    opacity: 0.05;
-  }
-  50% {
-    transform: translate(-50px, 150px) rotate(180deg);
-    opacity: 0.03;
-  }
-  75% {
-    transform: translate(-100px, -50px) rotate(270deg);
-    opacity: 0.04;
-  }
+  0%, 100% { transform: translate(0, 0) rotate(0deg); opacity: 0.03; }
+  25% { transform: translate(100px, -100px) rotate(90deg); opacity: 0.05; }
+  50% { transform: translate(-50px, 150px) rotate(180deg); opacity: 0.03; }
+  75% { transform: translate(-100px, -50px) rotate(270deg); opacity: 0.04; }
 }
 
 @keyframes float2 {
-  0%, 100% {
-    transform: translate(0, 0) rotate(0deg);
-    opacity: 0.04;
-  }
-  25% {
-    transform: translate(-120px, 80px) rotate(-90deg);
-    opacity: 0.06;
-  }
-  50% {
-    transform: translate(80px, -120px) rotate(-180deg);
-    opacity: 0.04;
-  }
-  75% {
-    transform: translate(120px, 100px) rotate(-270deg);
-    opacity: 0.05;
-  }
+  0%, 100% { transform: translate(0, 0) rotate(0deg); opacity: 0.04; }
+  25% { transform: translate(-120px, 80px) rotate(-90deg); opacity: 0.06; }
+  50% { transform: translate(80px, -120px) rotate(-180deg); opacity: 0.04; }
+  75% { transform: translate(120px, 100px) rotate(-270deg); opacity: 0.05; }
 }
 
 @keyframes float3 {
-  0%, 100% {
-    transform: translate(0, 0) rotate(0deg);
-    opacity: 0.03;
-  }
-  25% {
-    transform: translate(-80px, -80px) rotate(45deg);
-    opacity: 0.05;
-  }
-  50% {
-    transform: translate(100px, 100px) rotate(135deg);
-    opacity: 0.03;
-  }
-  75% {
-    transform: translate(-100px, 80px) rotate(225deg);
-    opacity: 0.04;
-  }
+  0%, 100% { transform: translate(0, 0) rotate(0deg); opacity: 0.03; }
+  25% { transform: translate(-80px, -80px) rotate(45deg); opacity: 0.05; }
+  50% { transform: translate(100px, 100px) rotate(135deg); opacity: 0.03; }
+  75% { transform: translate(-100px, 80px) rotate(225deg); opacity: 0.04; }
+}
+
+@keyframes pulse {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0.5; }
 }
 </style>
 
 <style scoped>
 .app {
   min-height: 100vh;
-  padding: 2rem;
-  background: linear-gradient(
-    -45deg,
-    #0f0c29 0%,
-    #302b63 25%,
-    #24243e 50%,
-    #302b63 75%,
-    #0f0c29 100%
-  );
+  background: linear-gradient(-45deg, #0f0c29 0%, #302b63 25%, #24243e 50%, #302b63 75%, #0f0c29 100%);
   background-size: 400% 400%;
   animation: gradient-shift 15s ease infinite;
   position: relative;
@@ -182,27 +135,125 @@ body {
   z-index: 1;
 }
 
-.new-session-btn {
-  position: fixed;
-  top: 2rem;
-  right: 2rem;
-  padding: 0.75rem 1.5rem;
-  background: rgba(102, 126, 234, 0.8);
-  border: 1px solid rgba(255, 255, 255, 0.2);
-  color: white;
-  border-radius: 12px;
-  font-weight: 600;
-  cursor: pointer;
-  transition: all 0.3s;
-  box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
-  backdrop-filter: blur(10px);
-  z-index: 50;
+.input-container {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 100vh;
+  padding: 2rem;
 }
 
-.new-session-btn:hover {
-  background: rgba(102, 126, 234, 0.95);
-  transform: translateY(-2px);
-  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.4);
-  border-color: rgba(255, 255, 255, 0.3);
+.session-layout {
+  display: grid;
+  grid-template-columns: 320px 1fr;
+  min-height: 100vh;
+  gap: 0;
+}
+
+.timeline-sidebar {
+  background: rgba(48, 43, 99, 0.4);
+  border-right: 1px solid rgba(255, 255, 255, 0.1);
+  backdrop-filter: blur(20px);
+  padding: 1.5rem;
+  overflow-y: auto;
+  max-height: 100vh;
+  box-shadow: inset -1px 0 0 rgba(102, 126, 234, 0.2);
+}
+
+.sidebar-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 1.5rem;
+  padding-bottom: 1rem;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.sidebar-header h2 {
+  font-size: 1.2rem;
+  margin: 0;
+  background: linear-gradient(135deg, #667eea, #764ba2);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+}
+
+.new-btn-small {
+  width: 32px;
+  height: 32px;
+  padding: 0;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 1.2rem;
+  background: rgba(102, 126, 234, 0.6);
+}
+
+.new-btn-small:hover {
+  background: rgba(102, 126, 234, 0.9);
+  transform: rotate(20deg);
+}
+
+.timeline-content {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.main-content {
+  padding: 2rem;
+  overflow-y: auto;
+  max-height: 100vh;
+}
+
+/* Scrollbar styling */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+  background: rgba(102, 126, 234, 0.4);
+  border-radius: 4px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: rgba(102, 126, 234, 0.6);
+}
+
+/* Mobile responsive */
+@media (max-width: 1024px) {
+  .session-layout {
+    grid-template-columns: 250px 1fr;
+  }
+
+  .timeline-sidebar {
+    padding: 1rem;
+  }
+
+  .main-content {
+    padding: 1rem;
+  }
+}
+
+@media (max-width: 768px) {
+  .session-layout {
+    grid-template-columns: 1fr;
+  }
+
+  .timeline-sidebar {
+    border-right: none;
+    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+    max-height: none;
+  }
+
+  .main-content {
+    max-height: none;
+  }
 }
 </style>
diff --git a/frontend/src/components/CollaborativeSession.vue b/frontend/src/components/CollaborativeSession.vue
index e1103eb..c5f0824 100644
--- a/frontend/src/components/CollaborativeSession.vue
+++ b/frontend/src/components/CollaborativeSession.vue
@@ -3,6 +3,7 @@ import { ref, computed, onMounted, onUnmounted } from 'vue'
 import { useCollaborationStore } from '../stores/collaboration'
 import { useWebSocket } from '../composables/useWebSocket'
 import DocumentViewer from './DocumentViewer.vue'
+import TimelinePanel from './TimelinePanel.vue'
 
 const props = defineProps({
   sessionId: {
@@ -18,17 +19,31 @@ const ws = useWebSocket(props.sessionId)
 
 const isRunningRound = ref(false)
 const sessionStarted = ref(false)
-const showTimeline = ref(false)
-const selectedVersion = ref(null)
+const isAutoRunning = ref(false)
+const autoRunTimeout = ref(null)
 
 const currentSession = computed(() => collaborationStore.currentSession)
 const currentDocument = computed(() => collaborationStore.currentDocument)
 const agents = computed(() => currentSession.value?.agents || [])
 const conversationHistory = computed(() => collaborationStore.conversationHistory)
+
+// True convergence: ALL 7 agents must say no changes
 const hasConverged = computed(() => {
   if (conversationHistory.value.length === 0) return false
   const lastRound = conversationHistory.value[conversationHistory.value.length - 1]
-  return !lastRound.agentsMadeChanges || lastRound.agentsMadeChanges.length === 0
+  // Check if last round has no changes from ANY agent
+  return !lastRound.agentsMadeChanges || (Array.isArray(lastRound.agentsMadeChanges) && lastRound.agentsMadeChanges.length === 0)
+})
+
+// Count of agents in current session
+const agentCount = computed(() => agents.value?.length || 0)
+
+// Check if all available agents have participated without changes
+const allAgentsConverged = computed(() => {
+  if (conversationHistory.value.length === 0) return false
+  const lastRound = conversationHistory.value[conversationHistory.value.length - 1]
+  // All agents in this session must have zero changes
+  return hasConverged.value && agentCount.value > 0
 })
 
 onMounted(async () => {
@@ -47,7 +62,10 @@ onMounted(async () => {
       }
     }, 100)
 
-    onUnmounted(() => clearInterval(messageInterval))
+    onUnmounted(() => {
+      clearInterval(messageInterval)
+      if (autoRunTimeout.value) clearTimeout(autoRunTimeout.value)
+    })
 
     // If session hasn't been started, start it
     if (currentSession.value?.status === 'created') {
@@ -62,19 +80,50 @@ const handleWebSocketMessage = (message) => {
   if (message.type === 'initial_document_created') {
     sessionStarted.value = true
     collaborationStore.updateDocumentFromMessage(message)
+    // Start first auto-round after initial document
+    scheduleNextRound(2000)
   } else if (message.type === 'document_modified') {
     collaborationStore.updateDocumentFromMessage(message)
   } else if (message.type === 'round_complete') {
     isRunningRound.value = false
     collaborationStore.updateDocumentFromMessage(message)
-    if (message.hasConverged) {
-      // Auto-complete on convergence
+
+    // Check convergence
+    if (hasConverged.value && allAgentsConverged.value) {
+      // All agents converged - auto-complete after delay
+      isAutoRunning.value = false
       setTimeout(() => {
         completeSession()
       }, 2000)
+    } else {
+      // Schedule next round with delay
+      scheduleNextRound(1500)
     }
   } else if (message.type === 'session_error') {
     console.error('Session error:', message.error)
+    isRunningRound.value = false
+    isAutoRunning.value = false
+  }
+}
+
+const scheduleNextRound = (delay) => {
+  if (autoRunTimeout.value) clearTimeout(autoRunTimeout.value)
+  isAutoRunning.value = true
+  autoRunTimeout.value = setTimeout(() => {
+    runNextRoundAuto()
+  }, delay)
+}
+
+const runNextRoundAuto = async () => {
+  if (isRunningRound.value || hasConverged.value) return
+
+  isRunningRound.value = true
+  try {
+    await collaborationStore.runRound(props.sessionId)
+  } catch (error) {
+    console.error('Error running auto round:', error)
+    isRunningRound.value = false
+    isAutoRunning.value = false
   }
 }
 
@@ -86,20 +135,10 @@ const startSession = async () => {
   }
 }
 
-const runNextRound = async () => {
-  if (isRunningRound.value || hasConverged.value) return
-
-  isRunningRound.value = true
-  try {
-    await collaborationStore.runRound(props.sessionId)
-  } catch (error) {
-    console.error('Error running round:', error)
-    isRunningRound.value = false
-  }
-}
-
 const completeSession = async () => {
   try {
+    isAutoRunning.value = false
+    if (autoRunTimeout.value) clearTimeout(autoRunTimeout.value)
     await collaborationStore.completeSession(props.sessionId)
     emit('session-completed')
   } catch (error) {
@@ -112,113 +151,287 @@ const downloadDocument = () => {
   const extension = format === 'md' ? 'md' : 'txt'
   collaborationStore.downloadDocument(`collaborative-document.${extension}`)
 }
-
-const viewVersion = (versionNumber) => {
-  selectedVersion.value = selectedVersion.value === versionNumber ? null : versionNumber
-}
 </script>
 
 <template>
   <div class="collaborative-session">
+    <!-- Header with minimal controls -->
     <div class="session-header">
       <div class="header-content">
-        <h1>Design Session</h1>
+        <h1>Collaborative Design</h1>
         <p class="session-meta">
           <span>Session #{{ sessionId }}</span>
-          <span class="badge" :class="{ active: sessionStarted }">
-            {{ sessionStarted ? 'Active' : 'Waiting' }}
+          <span class="badge" :class="{ active: sessionStarted, converged: allAgentsConverged }">
+            {{ allAgentsConverged ? 'Converged' : sessionStarted ? 'Active' : 'Waiting' }}
           </span>
         </p>
       </div>
 
       <div class="header-actions">
-        <button
-          @click="runNextRound"
-          :disabled="!sessionStarted || isRunningRound || hasConverged"
-          class="btn btn-primary"
-        >
-          {{ isRunningRound ? 'Round in Progress...' : 'Next Review Round' }}
-        </button>
-
-        <button
-          @click="completeSession"
-          :disabled="!sessionStarted"
-          class="btn btn-secondary"
-        >
-          Complete Session
-        </button>
-
         <button
           @click="downloadDocument"
           :disabled="!currentDocument"
-          class="btn btn-outline"
+          class="download-btn"
+          title="Download the document"
         >
           Download
         </button>
 
-        <button
-          @click="showTimeline = !showTimeline"
-          class="btn btn-outline"
-        >
-          Timeline
-        </button>
+        <div v-if="isAutoRunning || isRunningRound" class="auto-run-indicator">
+          <span class="pulse"></span>
+          Auto-running...
+        </div>
       </div>
     </div>
 
-    <!-- Status Message -->
-    <div v-if="hasConverged" class="convergence-message">
-      Convergence reached. All agents satisfied.
+    <!-- Status message -->
+    <div v-if="allAgentsConverged" class="convergence-message">
+      <span class="checkmark">[OK]</span>
+      All {{ agentCount }} agents have reviewed and approved. Auto-completing...
     </div>
 
-    <!-- Agent List -->
-    <div class="agents-section">
-      <h3>Team ({{ agents.length }} agents)</h3>
-      <div class="agents-grid">
-        <div v-for="agent in agents" :key="agent" class="agent-badge">
+    <!-- Team agents display -->
+    <div class="team-display">
+      <h3>Team</h3>
+      <div class="team-grid">
+        <div v-for="agent in agents" :key="agent" class="team-member">
           {{ formatAgentName(agent) }}
         </div>
       </div>
     </div>
 
-    <!-- Timeline View -->
-    <div v-if="showTimeline" class="timeline-section">
-      <h3>Modification Timeline</h3>
-      <div class="timeline">
-        <div v-for="(round, index) in conversationHistory" :key="index" class="timeline-item">
-          <div class="timeline-marker">
-            {{ index + 1 }}
-          </div>
-          <div class="timeline-content">
-            <div class="round-title">Round {{ round.roundNumber }}</div>
-            <div v-if="Array.isArray(round.agentsMadeChanges) && round.agentsMadeChanges.length > 0" class="agents-modified">
-              Modified by: {{ round.agentsMadeChanges.join(', ') }}
-            </div>
-            <div v-else class="no-changes">
-              No changes
-            </div>
-          </div>
-        </div>
-      </div>
-    </div>
-
-    <!-- Document Viewer -->
+    <!-- Main Document Viewer -->
     <div class="document-section">
+      <div class="document-header">
+        <h2>Architecture Document</h2>
+        <span v-if="currentDocument" class="doc-status">Live</span>
+      </div>
       <DocumentViewer
-        :document="currentDocument"
+        :document="currentDocument || 'Waiting for initial document...'"
         :format="currentSession?.documentFormat || 'md'"
       />
     </div>
-
-    <!-- Round Information -->
-    <div class="round-info">
-      <p>Current Round: <strong>{{ collaborationStore.currentRound }}</strong></p>
-      <p v-if="conversationHistory.length > 0">
-        Last Round: {{ conversationHistory.length }} agents reviewed
-      </p>
-    </div>
   </div>
 </template>
 
+<style scoped>
+@keyframes pulse {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0.5; }
+}
+
+.collaborative-session {
+  width: 100%;
+  display: flex;
+  flex-direction: column;
+  gap: 1.5rem;
+}
+
+.session-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 1.5rem;
+  background: rgba(255, 255, 255, 0.07);
+  backdrop-filter: blur(20px);
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-radius: 16px;
+  box-shadow: 0 8px 32px rgba(31, 38, 135, 0.1);
+}
+
+.header-content h1 {
+  margin: 0;
+  font-size: 1.8rem;
+  font-weight: 700;
+  background: linear-gradient(135deg, #667eea, #764ba2);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+}
+
+.session-meta {
+  margin-top: 0.5rem;
+  display: flex;
+  gap: 1rem;
+  align-items: center;
+  font-size: 0.9rem;
+  color: rgba(255, 255, 255, 0.7);
+}
+
+.badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.4rem 0.9rem;
+  background: rgba(255, 255, 255, 0.1);
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  border-radius: 20px;
+  font-size: 0.85rem;
+  font-weight: 500;
+}
+
+.badge.active {
+  background: rgba(102, 126, 234, 0.2);
+  border-color: rgba(102, 126, 234, 0.4);
+  color: rgba(102, 126, 234, 0.95);
+}
+
+.badge.converged {
+  background: rgba(76, 175, 80, 0.2);
+  border-color: rgba(76, 175, 80, 0.4);
+  color: rgba(76, 175, 80, 0.95);
+}
+
+.header-actions {
+  display: flex;
+  gap: 1rem;
+  align-items: center;
+}
+
+.download-btn {
+  padding: 0.75rem 1.5rem;
+  background: rgba(102, 126, 234, 0.8);
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  color: white;
+  border-radius: 10px;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.3s ease;
+  backdrop-filter: blur(10px);
+}
+
+.download-btn:hover:not(:disabled) {
+  background: rgba(102, 126, 234, 0.95);
+  transform: translateY(-2px);
+  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
+}
+
+.download-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.auto-run-indicator {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+  padding: 0.5rem 1rem;
+  background: rgba(76, 175, 80, 0.15);
+  border: 1px solid rgba(76, 175, 80, 0.3);
+  border-radius: 10px;
+  font-size: 0.85rem;
+  color: rgba(76, 175, 80, 0.9);
+  font-weight: 500;
+}
+
+.pulse {
+  display: inline-block;
+  width: 6px;
+  height: 6px;
+  background: rgba(76, 175, 80, 0.8);
+  border-radius: 50%;
+  animation: pulse 1.5s infinite;
+}
+
+.convergence-message {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  padding: 1.2rem;
+  background: rgba(76, 175, 80, 0.1);
+  border: 1px solid rgba(76, 175, 80, 0.3);
+  border-radius: 12px;
+  color: rgba(76, 175, 80, 0.95);
+  font-weight: 500;
+  backdrop-filter: blur(10px);
+}
+
+.checkmark {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  background: rgba(76, 175, 80, 0.3);
+  border-radius: 50%;
+  font-weight: 700;
+  font-size: 0.9rem;
+}
+
+.team-display {
+  padding: 1rem;
+  background: rgba(255, 255, 255, 0.04);
+  border: 1px solid rgba(255, 255, 255, 0.08);
+  border-radius: 12px;
+}
+
+.team-display h3 {
+  margin: 0 0 0.75rem 0;
+  font-size: 0.95rem;
+  color: rgba(255, 255, 255, 0.8);
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  font-weight: 600;
+}
+
+.team-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
+  gap: 0.6rem;
+}
+
+.team-member {
+  padding: 0.6rem 0.9rem;
+  background: rgba(102, 126, 234, 0.12);
+  border: 1px solid rgba(102, 126, 234, 0.25);
+  border-radius: 8px;
+  font-size: 0.85rem;
+  color: rgba(102, 126, 234, 0.95);
+  font-weight: 500;
+  text-align: center;
+  transition: all 0.3s ease;
+}
+
+.team-member:hover {
+  background: rgba(102, 126, 234, 0.2);
+  border-color: rgba(102, 126, 234, 0.4);
+}
+
+.document-section {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+}
+
+.document-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 1rem;
+  padding-bottom: 0.75rem;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.document-header h2 {
+  margin: 0;
+  font-size: 1.2rem;
+  color: white;
+}
+
+.doc-status {
+  display: inline-block;
+  padding: 0.3rem 0.7rem;
+  background: rgba(76, 175, 80, 0.2);
+  border: 1px solid rgba(76, 175, 80, 0.3);
+  border-radius: 6px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  color: rgba(76, 175, 80, 0.9);
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+</style>
+
 <script>
 function formatAgentName(agent) {
   return agent
@@ -227,290 +440,3 @@ function formatAgentName(agent) {
     .join(' ')
 }
 </script>
-
-<style scoped>
-@keyframes gradient-shift {
-  0% {
-    background-position: 0% 50%;
-  }
-  50% {
-    background-position: 100% 50%;
-  }
-  100% {
-    background-position: 0% 50%;
-  }
-}
-
-@keyframes float1 {
-  0%, 100% {
-    transform: translate(0, 0) rotate(0deg);
-    opacity: 0.03;
-  }
-  25% {
-    transform: translate(100px, -100px) rotate(90deg);
-    opacity: 0.05;
-  }
-  50% {
-    transform: translate(-50px, 150px) rotate(180deg);
-    opacity: 0.03;
-  }
-  75% {
-    transform: translate(-100px, -50px) rotate(270deg);
-    opacity: 0.04;
-  }
-}
-
-.collaborative-session {
-  max-width: 100%;
-  margin: 0;
-  padding: 2rem;
-  min-height: 100vh;
-  background: linear-gradient(
-    -45deg,
-    #0f0c29 0%,
-    #302b63 25%,
-    #24243e 50%,
-    #302b63 75%,
-    #0f0c29 100%
-  );
-  background-size: 400% 400%;
-  animation: gradient-shift 15s ease infinite;
-  position: relative;
-  overflow: hidden;
-}
-
-.collaborative-session::before {
-  content: '';
-  position: fixed;
-  top: 0;
-  left: 0;
-  width: 200%;
-  height: 200%;
-  background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
-              radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.08) 0%, transparent 50%);
-  animation: float1 20s ease-in-out infinite;
-  pointer-events: none;
-  z-index: 0;
-}
-
-.collaborative-session > * {
-  position: relative;
-  z-index: 1;
-}
-
-.session-header {
-  display: flex;
-  justify-content: space-between;
-  align-items: flex-start;
-  margin-bottom: 2rem;
-  padding: 1.5rem;
-  background: rgba(255, 255, 255, 0.08);
-  backdrop-filter: blur(10px);
-  border: 1px solid rgba(255, 255, 255, 0.15);
-  border-radius: 20px;
-  color: white;
-  box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
-}
-
-.header-content h1 {
-  margin: 0;
-  font-size: 2rem;
-  font-weight: 700;
-}
-
-.session-meta {
-  margin-top: 0.5rem;
-  opacity: 0.9;
-  display: flex;
-  gap: 1rem;
-}
-
-.badge {
-  display: inline-block;
-  padding: 0.25rem 0.75rem;
-  background: rgba(255, 255, 255, 0.2);
-  border-radius: 20px;
-  font-size: 0.875rem;
-}
-
-.badge.active {
-  background: rgba(76, 175, 80, 0.4);
-}
-
-.header-actions {
-  display: flex;
-  gap: 0.75rem;
-  flex-wrap: wrap;
-  justify-content: flex-end;
-}
-
-.btn {
-  padding: 0.75rem 1.25rem;
-  border-radius: 10px;
-  font-weight: 600;
-  cursor: pointer;
-  transition: all 0.3s;
-  font-size: 0.95rem;
-}
-
-.btn-primary {
-  background: rgba(255, 255, 255, 0.95);
-  color: #667eea;
-  border: none;
-}
-
-.btn-primary:hover:not(:disabled) {
-  transform: translateY(-2px);
-  box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
-}
-
-.btn-secondary,
-.btn-outline {
-  background: rgba(255, 255, 255, 0.15);
-  color: white;
-  border: 1px solid rgba(255, 255, 255, 0.3);
-  backdrop-filter: blur(5px);
-}
-
-.btn-secondary:hover:not(:disabled),
-.btn-outline:hover:not(:disabled) {
-  background: rgba(255, 255, 255, 0.25);
-  border-color: rgba(255, 255, 255, 0.5);
-}
-
-.btn:disabled {
-  opacity: 0.5;
-  cursor: not-allowed;
-}
-
-.convergence-message {
-  padding: 1rem;
-  background: rgba(76, 175, 80, 0.15);
-  border: 1px solid rgba(76, 175, 80, 0.4);
-  border-radius: 12px;
-  color: rgba(76, 175, 80, 0.9);
-  margin-bottom: 1.5rem;
-  text-align: center;
-  font-weight: 600;
-  backdrop-filter: blur(5px);
-}
-
-.agents-section {
-  margin-bottom: 2rem;
-}
-
-.agents-section h3 {
-  margin-bottom: 1rem;
-  color: white;
-}
-
-.agents-grid {
-  display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
-  gap: 1rem;
-}
-
-.agent-badge {
-  padding: 0.75rem;
-  background: rgba(102, 126, 234, 0.1);
-  border: 1px solid rgba(102, 126, 234, 0.3);
-  border-radius: 10px;
-  text-align: center;
-  font-size: 0.95rem;
-  color: rgba(255, 255, 255, 0.8);
-  backdrop-filter: blur(5px);
-}
-
-.timeline-section {
-  margin-bottom: 2rem;
-  padding: 1.5rem;
-  background: rgba(255, 255, 255, 0.08);
-  border: 1px solid rgba(255, 255, 255, 0.15);
-  border-radius: 12px;
-  backdrop-filter: blur(10px);
-}
-
-.timeline-section h3 {
-  margin-top: 0;
-  color: white;
-}
-
-.timeline {
-  display: flex;
-  flex-direction: column;
-  gap: 1rem;
-}
-
-.timeline-item {
-  display: flex;
-  gap: 1rem;
-  padding: 1rem;
-  background: rgba(255, 255, 255, 0.05);
-  border-radius: 8px;
-  border-left: 3px solid rgba(102, 126, 234, 0.6);
-  backdrop-filter: blur(5px);
-}
-
-.timeline-marker {
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  width: 2rem;
-  height: 2rem;
-  background: rgba(102, 126, 234, 0.6);
-  color: white;
-  border-radius: 50%;
-  flex-shrink: 0;
-  font-weight: 700;
-}
-
-.timeline-content {
-  flex: 1;
-}
-
-.round-title {
-  font-weight: 600;
-  color: white;
-  margin-bottom: 0.25rem;
-}
-
-.agents-modified {
-  font-size: 0.875rem;
-  color: rgba(255, 255, 255, 0.7);
-}
-
-.no-changes {
-  font-size: 0.875rem;
-  color: rgba(255, 255, 255, 0.5);
-  font-style: italic;
-}
-
-.document-section {
-  margin: 2rem 0;
-}
-
-.round-info {
-  padding: 1rem;
-  background: rgba(255, 255, 255, 0.08);
-  border: 1px solid rgba(255, 255, 255, 0.15);
-  border-radius: 12px;
-  text-align: center;
-  color: rgba(255, 255, 255, 0.7);
-  backdrop-filter: blur(10px);
-}
-
-@media (max-width: 768px) {
-  .session-header {
-    flex-direction: column;
-    gap: 1rem;
-  }
-
-  .header-actions {
-    justify-content: flex-start;
-  }
-
-  .agents-grid {
-    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
-  }
-}
-</style>
diff --git a/frontend/src/components/NetworkStatus.vue b/frontend/src/components/NetworkStatus.vue
index 82e3c63..fe6c08c 100644
--- a/frontend/src/components/NetworkStatus.vue
+++ b/frontend/src/components/NetworkStatus.vue
@@ -64,12 +64,12 @@ function getStatusColor() {
 
 function getStatusEmoji() {
   switch (quality.value) {
-    case 'excellent': return '●'
-    case 'good': return '●'
-    case 'fair': return '●'
-    case 'poor': return '●'
-    case 'offline': return '●'
-    default: return '●'
+    case 'excellent': return 'O'
+    case 'good': return 'O'
+    case 'fair': return 'O'
+    case 'poor': return 'O'
+    case 'offline': return 'O'
+    default: return 'O'
   }
 }
 </script>
diff --git a/frontend/src/components/TimelinePanel.vue b/frontend/src/components/TimelinePanel.vue
new file mode 100644
index 0000000..1bf463e
--- /dev/null
+++ b/frontend/src/components/TimelinePanel.vue
@@ -0,0 +1,275 @@
+<script setup>
+import { computed } from 'vue'
+import { useCollaborationStore } from '../stores/collaboration'
+
+const collaborationStore = useCollaborationStore()
+
+const conversationHistory = computed(() => collaborationStore.conversationHistory)
+const currentRound = computed(() => collaborationStore.currentRound)
+
+const allAgents = ['lead_architect', 'backend_engineer', 'frontend_engineer', 'ui_designer', 'devops_engineer', 'product_manager', 'security_specialist']
+
+const getAgentStatus = (round) => {
+  if (!round.agentsMadeChanges) return []
+  return allAgents.map(agent => ({
+    name: formatAgentName(agent),
+    made_changes: round.agentsMadeChanges.includes(agent) || round.agentsMadeChanges.some(a => a.includes(agent))
+  }))
+}
+
+const roundProgress = computed(() => {
+  if (conversationHistory.value.length === 0) return 0
+  return Math.round((conversationHistory.value.length / 10) * 100)
+})
+
+function formatAgentName(agent) {
+  return agent
+    .split('_')
+    .map(word => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ')
+}
+</script>
+
+<template>
+  <div class="timeline-panel">
+    <!-- Progress Bar -->
+    <div class="progress-section">
+      <div class="progress-header">
+        <span class="progress-label">Session Progress</span>
+        <span class="progress-percent">{{ roundProgress }}%</span>
+      </div>
+      <div class="progress-bar">
+        <div class="progress-fill" :style="{ width: roundProgress + '%' }"></div>
+      </div>
+      <div class="round-counter">Round {{ currentRound }}</div>
+    </div>
+
+    <!-- Timeline -->
+    <div class="timeline-list">
+      <div
+        v-for="(round, index) in conversationHistory"
+        :key="index"
+        class="timeline-entry"
+      >
+        <div class="entry-header">
+          <div class="round-number">{{ index + 1 }}</div>
+          <div class="round-label">Round {{ round.roundNumber }}</div>
+        </div>
+
+        <!-- Agent status for this round -->
+        <div class="agent-list">
+          <div
+            v-for="agent in getAgentStatus(round)"
+            :key="agent.name"
+            class="agent-item"
+            :class="{ active: agent.made_changes }"
+            :title="agent.made_changes ? 'Made changes' : 'No changes'"
+          >
+            <span class="agent-dot" :class="{ changed: agent.made_changes }"></span>
+            <span class="agent-short">{{ agent.name.split(' ')[0].slice(0, 1) }}</span>
+          </div>
+        </div>
+
+        <!-- Changes summary -->
+        <div v-if="round.agentsMadeChanges && round.agentsMadeChanges.length > 0" class="changes-count">
+          {{ round.agentsMadeChanges.length }} agent{{ round.agentsMadeChanges.length !== 1 ? 's' : '' }} modified
+        </div>
+        <div v-else class="no-changes-text">No changes</div>
+      </div>
+
+      <!-- Empty state -->
+      <div v-if="conversationHistory.length === 0" class="empty-state">
+        <p>Waiting for first round...</p>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.timeline-panel {
+  display: flex;
+  flex-direction: column;
+  gap: 1.5rem;
+  height: 100%;
+}
+
+.progress-section {
+  padding: 1rem;
+  background: rgba(102, 126, 234, 0.1);
+  border: 1px solid rgba(102, 126, 234, 0.3);
+  border-radius: 12px;
+  backdrop-filter: blur(10px);
+}
+
+.progress-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 0.75rem;
+  font-size: 0.875rem;
+}
+
+.progress-label {
+  color: rgba(255, 255, 255, 0.7);
+  font-weight: 500;
+}
+
+.progress-percent {
+  color: var(--primary);
+  font-weight: 600;
+}
+
+.progress-bar {
+  height: 6px;
+  background: rgba(255, 255, 255, 0.05);
+  border-radius: 3px;
+  overflow: hidden;
+  margin-bottom: 0.5rem;
+}
+
+.progress-fill {
+  height: 100%;
+  background: linear-gradient(90deg, #667eea, #764ba2);
+  border-radius: 3px;
+  transition: width 0.3s ease;
+}
+
+.round-counter {
+  text-align: center;
+  font-size: 0.875rem;
+  color: rgba(255, 255, 255, 0.6);
+  font-weight: 500;
+}
+
+.timeline-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  flex: 1;
+  overflow-y: auto;
+}
+
+.timeline-entry {
+  padding: 0.875rem;
+  background: rgba(255, 255, 255, 0.03);
+  border: 1px solid rgba(102, 126, 234, 0.2);
+  border-radius: 10px;
+  backdrop-filter: blur(10px);
+  transition: all 0.3s ease;
+}
+
+.timeline-entry:hover {
+  background: rgba(255, 255, 255, 0.06);
+  border-color: rgba(102, 126, 234, 0.4);
+}
+
+.entry-header {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.5rem;
+}
+
+.round-number {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  background: rgba(102, 126, 234, 0.5);
+  border-radius: 50%;
+  font-size: 0.75rem;
+  font-weight: 700;
+  color: white;
+}
+
+.round-label {
+  font-size: 0.875rem;
+  font-weight: 600;
+  color: rgba(255, 255, 255, 0.9);
+}
+
+.agent-list {
+  display: flex;
+  gap: 0.4rem;
+  margin-bottom: 0.5rem;
+  flex-wrap: wrap;
+}
+
+.agent-item {
+  display: flex;
+  align-items: center;
+  gap: 0.3rem;
+  padding: 0.25rem 0.5rem;
+  background: rgba(255, 255, 255, 0.05);
+  border-radius: 6px;
+  font-size: 0.7rem;
+  color: rgba(255, 255, 255, 0.5);
+  cursor: help;
+  transition: all 0.2s ease;
+}
+
+.agent-item.active {
+  background: rgba(76, 175, 80, 0.2);
+  color: rgba(76, 175, 80, 0.9);
+  border: 1px solid rgba(76, 175, 80, 0.3);
+}
+
+.agent-dot {
+  width: 4px;
+  height: 4px;
+  background: rgba(255, 255, 255, 0.3);
+  border-radius: 50%;
+}
+
+.agent-dot.changed {
+  background: rgba(76, 175, 80, 0.8);
+  width: 5px;
+  height: 5px;
+}
+
+.agent-short {
+  font-weight: 600;
+  font-size: 0.65rem;
+}
+
+.changes-count {
+  font-size: 0.75rem;
+  color: rgba(76, 175, 80, 0.8);
+  font-weight: 500;
+}
+
+.no-changes-text {
+  font-size: 0.75rem;
+  color: rgba(255, 255, 255, 0.4);
+  font-style: italic;
+}
+
+.empty-state {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+  color: rgba(255, 255, 255, 0.4);
+  text-align: center;
+  font-size: 0.875rem;
+}
+
+/* Scrollbar */
+.timeline-list::-webkit-scrollbar {
+  width: 6px;
+}
+
+.timeline-list::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.timeline-list::-webkit-scrollbar-thumb {
+  background: rgba(102, 126, 234, 0.3);
+  border-radius: 3px;
+}
+
+.timeline-list::-webkit-scrollbar-thumb:hover {
+  background: rgba(102, 126, 234, 0.5);
+}
+</style>
diff --git a/frontend/src/style.css b/frontend/src/style.css
index f691315..d5668e6 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -1,79 +1,136 @@
 :root {
-  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
-  line-height: 1.5;
+  --primary: #667eea;
+  --primary-dark: #5568d3;
+  --secondary: #764ba2;
+  --accent: #f093fb;
+  --dark-bg: #0f0c29;
+  --mid-bg: #302b63;
+  --light-bg: #24243e;
+  --text-primary: #ffffff;
+  --text-secondary: rgba(255, 255, 255, 0.7);
+  --glass-bg: rgba(255, 255, 255, 0.05);
+  --glass-border: rgba(255, 255, 255, 0.1);
+
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+  line-height: 1.6;
   font-weight: 400;
-
-  color-scheme: light dark;
-  color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
-
+  color-scheme: dark;
+  color: var(--text-primary);
+  background-color: var(--dark-bg);
   font-synthesis: none;
   text-rendering: optimizeLegibility;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }
 
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
-}
-a:hover {
-  color: #535bf2;
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
 }
 
 body {
   margin: 0;
-  display: flex;
-  place-items: center;
   min-width: 320px;
   min-height: 100vh;
 }
 
-h1 {
-  font-size: 3.2em;
-  line-height: 1.1;
+a {
+  color: var(--primary);
+  text-decoration: none;
+  transition: all 0.3s ease;
 }
 
+a:hover {
+  color: var(--accent);
+  text-decoration: underline;
+}
+
+h1, h2, h3, h4, h5, h6 {
+  font-weight: 600;
+  line-height: 1.2;
+}
+
+h1 { font-size: 2.5em; }
+h2 { font-size: 2em; }
+h3 { font-size: 1.5em; }
+
 button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
+  border-radius: 12px;
+  border: 1px solid var(--glass-border);
+  padding: 0.75em 1.5em;
   font-size: 1em;
   font-weight: 500;
   font-family: inherit;
-  background-color: #1a1a1a;
+  background: rgba(102, 126, 234, 0.8);
+  color: var(--text-primary);
   cursor: pointer;
-  transition: border-color 0.25s;
-}
-button:hover {
-  border-color: #646cff;
-}
-button:focus,
-button:focus-visible {
-  outline: 4px auto -webkit-focus-ring-color;
+  transition: all 0.3s ease;
+  backdrop-filter: blur(10px);
+  box-shadow: 0 8px 32px rgba(31, 38, 135, 0.1);
 }
 
-.card {
-  padding: 2em;
+button:hover:not(:disabled) {
+  background: rgba(102, 126, 234, 0.95);
+  transform: translateY(-2px);
+  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.3);
+  border-color: var(--glass-border);
+}
+
+button:active:not(:disabled) {
+  transform: translateY(0);
+}
+
+button:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+button.secondary {
+  background: rgba(118, 75, 162, 0.6);
+}
+
+button.secondary:hover:not(:disabled) {
+  background: rgba(118, 75, 162, 0.8);
+}
+
+button.outline {
+  background: transparent;
+  border: 1px solid var(--primary);
+  color: var(--primary);
+}
+
+button.outline:hover:not(:disabled) {
+  background: rgba(102, 126, 234, 0.2);
+  border-color: var(--accent);
+  color: var(--accent);
+}
+
+input, textarea, select {
+  background: rgba(255, 255, 255, 0.05);
+  border: 1px solid var(--glass-border);
+  color: var(--text-primary);
+  padding: 0.75em 1em;
+  border-radius: 8px;
+  font-family: inherit;
+  transition: all 0.3s ease;
+}
+
+input:focus, textarea:focus, select:focus {
+  outline: none;
+  border-color: var(--primary);
+  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
+  background: rgba(255, 255, 255, 0.08);
 }
 
 #app {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
+  min-height: 100vh;
 }
 
-@media (prefers-color-scheme: light) {
-  :root {
-    color: #213547;
-    background-color: #ffffff;
-  }
-  a:hover {
-    color: #747bff;
-  }
-  button {
-    background-color: #f9f9f9;
+@media (prefers-reduced-motion: reduce) {
+  *, *::before, *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
   }
 }