diff --git a/frontend/src/components/TopicDetail.vue b/frontend/src/components/TopicDetail.vue
index 49956a3..8e6e555 100644
--- a/frontend/src/components/TopicDetail.vue
+++ b/frontend/src/components/TopicDetail.vue
@@ -1,5 +1,5 @@
 <script setup>
-import { computed, ref, nextTick } from 'vue'
+import { computed, ref, nextTick, onMounted, onUnmounted } from 'vue'
 import { marked } from 'marked'
 import DOMPurify from 'dompurify'
 import { htmlUrl, chatGuide, fetchProgress, setProgress } from '../api.js'
@@ -25,6 +25,12 @@ function onFrameLoad(e) {
   if (!doc) return
   injectStyles(doc)
   setupProgress(doc)
+  // Klicks im iframe blubbern nicht zum Eltern-document → eigener Listener (same-origin)
+  doc.addEventListener('mousedown', onFrameMouseDown)
+}
+
+function onFrameMouseDown() {
+  if (chatOpen.value) closeChat()
 }
 
 function injectStyles(doc) {
@@ -113,6 +119,7 @@ const input = ref('')
 const loading = ref(false)
 const messagesEl = ref(null)
 const inputEl = ref(null)
+const panelEl = ref(null)
 
 function openChat() {
   chatOpen.value = true
@@ -125,6 +132,36 @@ function closeChat() {
   input.value = ''
 }
 
+// Klicks außerhalb des iframes (Sidebar, Ränder) — mousedown vermeidet die Open/Close-Race beim FAB
+function onDocMouseDown(e) {
+  if (!chatOpen.value) return
+  if (panelEl.value && panelEl.value.contains(e.target)) return
+  closeChat()
+}
+
+// Enter öffnet den Chat (wenn zu, nicht in Eingabefeld); ESC schließt ihn
+function onDocKeyDown(e) {
+  if (e.key === 'Escape' && chatOpen.value) {
+    e.preventDefault()
+    closeChat()
+    return
+  }
+  if (e.key !== 'Enter' || chatOpen.value || !props.previewGuide) return
+  const tag = document.activeElement?.tagName
+  if (tag === 'INPUT' || tag === 'TEXTAREA') return
+  e.preventDefault()
+  openChat()
+}
+
+onMounted(() => {
+  document.addEventListener('mousedown', onDocMouseDown, true)
+  document.addEventListener('keydown', onDocKeyDown)
+})
+onUnmounted(() => {
+  document.removeEventListener('mousedown', onDocMouseDown, true)
+  document.removeEventListener('keydown', onDocKeyDown)
+})
+
 function extractContext() {
   try {
     const doc = frameEl.value?.contentDocument
@@ -199,7 +236,7 @@ async function send() {
 
     <button v-if="previewGuide && !chatOpen" class="chat-fab" title="Fragen zum Guide" @click="openChat">💬</button>
 
-    <div v-if="previewGuide && chatOpen" class="chat-panel">
+    <div v-if="previewGuide && chatOpen" ref="panelEl" class="chat-panel">
       <header class="chat-header">
         <span>Fragen zum Guide</span>
         <button class="chat-close" title="Chat beenden" @click="closeChat">×</button>