diff --git a/apps/mobile/app/(app)/conversations/[id].tsx b/apps/mobile/app/(app)/conversations/[id].tsx
index d23f71a..1adec33 100644
--- a/apps/mobile/app/(app)/conversations/[id].tsx
+++ b/apps/mobile/app/(app)/conversations/[id].tsx
@@ -1,9 +1,15 @@
 import { chat } from '@chat-app/shared';
-import type { ConversationSummary, DecryptedMessage } from '@chat-app/shared/chat';
+import type {
+  ConversationSummary,
+  DecryptedMessage,
+  MessageReaction,
+} from '@chat-app/shared/chat';
 import { Stack, useLocalSearchParams } from 'expo-router';
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import {
+  ActionSheetIOS,
   ActivityIndicator,
+  Alert,
   FlatList,
   KeyboardAvoidingView,
   Platform,
@@ -14,22 +20,24 @@ import {
   View,
 } from 'react-native';
 
+import { MessageActionsSheet } from '../../../components/MessageActionsSheet';
+import { MessageBubble } from '../../../components/MessageBubble';
 import { useAuth } from '../../../lib/authContext';
+import { captureFromCamera, pickFromLibrary, type PickedImage } from '../../../lib/imagePicker';
 import { supabase } from '../../../lib/supabase';
 import { colors } from '../../../theme/colors';
 
-// Phase 1 conversation detail: fetch + decrypt last 50 messages, render
-// them newest-at-bottom, and let the user send a text message. No
-// realtime subscription, no attachments, no edit/delete — those are
-// later phases. Pull-to-refresh re-fetches.
 export default function ConversationDetail() {
   const { id } = useLocalSearchParams<{ id: string }>();
   const { user, device, ownPrivateKey } = useAuth();
   const [conversation, setConversation] = useState<ConversationSummary | null>(null);
   const [messages, setMessages] = useState<DecryptedMessage[] | null>(null);
+  const [reactions, setReactions] = useState<Map<string, MessageReaction[]>>(new Map());
   const [text, setText] = useState('');
   const [sending, setSending] = useState(false);
   const [error, setError] = useState<string | null>(null);
+  const [replyTo, setReplyTo] = useState<DecryptedMessage | null>(null);
+  const [activeMessage, setActiveMessage] = useState<DecryptedMessage | null>(null);
   const listRef = useRef<FlatList<DecryptedMessage>>(null);
 
   const load = useCallback(async () => {
@@ -37,9 +45,7 @@ export default function ConversationDetail() {
     setError(null);
     try {
       const all = await chat.listConversations(supabase);
-      const conv = all.find((c) => c.id === id) ?? null;
-      setConversation(conv);
-
+      setConversation(all.find((c) => c.id === id) ?? null);
       const ciphers = await chat.fetchConversationMessages(supabase, id, 50);
       const decrypted = await chat.decryptMessages({
         client: supabase,
@@ -48,6 +54,17 @@ export default function ConversationDetail() {
         ownPrivateKey,
       });
       setMessages(decrypted);
+      const rows = await chat.listReactionsForMessages(
+        supabase,
+        decrypted.map((m) => m.id),
+      );
+      const map = new Map<string, MessageReaction[]>();
+      for (const r of rows) {
+        const arr = map.get(r.messageId) ?? [];
+        arr.push(r);
+        map.set(r.messageId, arr);
+      }
+      setReactions(map);
     } catch (err: unknown) {
       setError(err instanceof Error ? err.message : 'Nachrichten konnten nicht geladen werden');
     }
@@ -72,10 +89,11 @@ export default function ConversationDetail() {
       ? (conversation.name ?? 'Gruppe')
       : (conversation?.peer?.displayName ?? '…');
 
-  async function handleSend() {
+  async function handleSendText() {
     if (!text.trim() || !user || !device || !ownPrivateKey || !id || sending) return;
     setSending(true);
     setError(null);
+    const replyToId = replyTo?.id;
     try {
       await chat.sendEncryptedMessage({
         client: supabase,
@@ -84,8 +102,10 @@ export default function ConversationDetail() {
         senderUserId: user.id,
         senderDeviceId: device.id,
         senderPrivateKey: ownPrivateKey,
+        ...(replyToId ? { replyToId } : {}),
       });
       setText('');
+      setReplyTo(null);
       await load();
     } catch (err: unknown) {
       setError(err instanceof Error ? err.message : 'Senden fehlgeschlagen');
@@ -94,6 +114,123 @@ export default function ConversationDetail() {
     }
   }
 
+  async function sendImage(pick: PickedImage) {
+    if (!user || !device || !ownPrivateKey || !id) return;
+    setSending(true);
+    setError(null);
+    try {
+      const resp = await fetch(pick.uri);
+      const blob = await resp.blob();
+      const result = await chat.encryptAndUploadAttachment({
+        client: supabase,
+        conversationId: id,
+        file: blob,
+        mimeType: pick.mimeType,
+        sizeBytes: pick.sizeBytes,
+        width: pick.width,
+        height: pick.height,
+      });
+      await chat.sendEncryptedMessage({
+        client: supabase,
+        conversationId: id,
+        plaintext: '',
+        senderUserId: user.id,
+        senderDeviceId: device.id,
+        senderPrivateKey: ownPrivateKey,
+        attachmentHandles: [result.handle],
+      });
+      await load();
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'Bild senden fehlgeschlagen');
+    } finally {
+      setSending(false);
+    }
+  }
+
+  function openImageMenu() {
+    if (Platform.OS === 'ios') {
+      ActionSheetIOS.showActionSheetWithOptions(
+        { options: ['Foto aufnehmen', 'Aus Galerie wählen', 'Abbrechen'], cancelButtonIndex: 2 },
+        async (idx) => {
+          if (idx === 0) {
+            const p = await captureFromCamera();
+            if (p) await sendImage(p);
+          } else if (idx === 1) {
+            const p = await pickFromLibrary();
+            if (p) await sendImage(p);
+          }
+        },
+      );
+    } else {
+      Alert.alert('Bild senden', undefined, [
+        {
+          text: 'Foto aufnehmen',
+          onPress: async () => {
+            const p = await captureFromCamera();
+            if (p) await sendImage(p);
+          },
+        },
+        {
+          text: 'Aus Galerie wählen',
+          onPress: async () => {
+            const p = await pickFromLibrary();
+            if (p) await sendImage(p);
+          },
+        },
+        { text: 'Abbrechen', style: 'cancel' },
+      ]);
+    }
+  }
+
+  async function handleReact(emoji: string, messageId: string) {
+    if (!user) return;
+    try {
+      const mine = reactions.get(messageId)?.some((r) => r.userId === user.id && r.emoji === emoji);
+      if (mine) {
+        await chat.removeReaction(supabase, messageId, emoji);
+      } else {
+        await chat.addReaction(supabase, messageId, emoji);
+      }
+      const rows = await chat.listReactionsForMessages(
+        supabase,
+        (messages ?? []).map((m) => m.id),
+      );
+      const map = new Map<string, MessageReaction[]>();
+      for (const r of rows) {
+        const arr = map.get(r.messageId) ?? [];
+        arr.push(r);
+        map.set(r.messageId, arr);
+      }
+      setReactions(map);
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'Reaktion fehlgeschlagen');
+    }
+  }
+
+  function handleDelete(messageId: string) {
+    Alert.alert('Nachricht löschen', 'Diese Nachricht für alle löschen?', [
+      { text: 'Abbrechen', style: 'cancel' },
+      {
+        text: 'Löschen',
+        style: 'destructive',
+        onPress: async () => {
+          try {
+            await chat.softDeleteMessage(supabase, messageId);
+            await load();
+          } catch (err: unknown) {
+            setError(err instanceof Error ? err.message : 'Löschen fehlgeschlagen');
+          }
+        },
+      },
+    ]);
+  }
+
+  const parentLookup = useMemo(() => {
+    const m = new Map<string, DecryptedMessage>();
+    for (const msg of messages ?? []) m.set(msg.id, msg);
+    return m;
+  }, [messages]);
+
   return (
     <KeyboardAvoidingView
       style={styles.container}
@@ -123,22 +260,59 @@ export default function ConversationDetail() {
           data={messages}
           keyExtractor={(m) => m.id}
           contentContainerStyle={styles.listContent}
-          renderItem={({ item }) => (
-            <MessageRow
-              senderName={senderName(item.senderId)}
-              mine={item.senderId === user?.id}
-              body={item.plaintext ?? '🔒 [Entschlüsselung fehlgeschlagen]'}
-              time={new Date(item.createdAt).toLocaleTimeString('de-DE', {
-                hour: '2-digit',
-                minute: '2-digit',
-              })}
-            />
-          )}
+          renderItem={({ item }) => {
+            const parent = item.replyToId ? (parentLookup.get(item.replyToId) ?? null) : null;
+            return (
+              <MessageBubble
+                message={item}
+                mine={item.senderId === user?.id}
+                senderName={senderName(item.senderId)}
+                parent={parent}
+                parentSenderName={parent ? senderName(parent.senderId) : ''}
+                time={new Date(item.createdAt).toLocaleTimeString('de-DE', {
+                  hour: '2-digit',
+                  minute: '2-digit',
+                })}
+                reactions={reactions.get(item.id) ?? []}
+                myUserId={user?.id ?? null}
+                ownDeviceId={device?.id ?? null}
+                ownPrivateKey={ownPrivateKey}
+                onLongPress={() => setActiveMessage(item)}
+                onToggleReaction={(emoji) => {
+                  void handleReact(emoji, item.id);
+                }}
+              />
+            );
+          }}
           onContentSizeChange={() => listRef.current?.scrollToEnd({ animated: false })}
         />
       )}
 
+      {replyTo && (
+        <View style={styles.replyBanner}>
+          <View style={styles.replyBannerLeft}>
+            <Text style={styles.replyBannerLabel}>
+              Antwort an {senderName(replyTo.senderId)}
+            </Text>
+            <Text style={styles.replyBannerBody} numberOfLines={1}>
+              {replyTo.plaintext ?? '…'}
+            </Text>
+          </View>
+          <Pressable onPress={() => setReplyTo(null)} hitSlop={10}>
+            <Text style={styles.replyBannerClose}>×</Text>
+          </Pressable>
+        </View>
+      )}
+
       <View style={styles.inputRow}>
+        <Pressable
+          style={styles.plusBtn}
+          onPress={openImageMenu}
+          disabled={sending}
+          hitSlop={6}
+        >
+          <Text style={styles.plusText}>＋</Text>
+        </Pressable>
         <TextInput
           value={text}
           onChangeText={setText}
@@ -151,7 +325,7 @@ export default function ConversationDetail() {
         <Pressable
           style={[styles.sendBtn, (!text.trim() || sending) && styles.sendBtnDisabled]}
           disabled={!text.trim() || sending}
-          onPress={handleSend}
+          onPress={handleSendText}
         >
           {sending ? (
             <ActivityIndicator color={colors.text} />
@@ -160,29 +334,22 @@ export default function ConversationDetail() {
           )}
         </Pressable>
       </View>
-    </KeyboardAvoidingView>
-  );
-}
 
-function MessageRow({
-  senderName,
-  mine,
-  body,
-  time,
-}: {
-  senderName: string;
-  mine: boolean;
-  body: string;
-  time: string;
-}) {
-  return (
-    <View style={[styles.bubbleWrap, mine ? styles.bubbleWrapMine : styles.bubbleWrapOther]}>
-      <View style={[styles.bubble, mine ? styles.bubbleMine : styles.bubbleOther]}>
-        {!mine && <Text style={styles.sender}>{senderName}</Text>}
-        <Text style={styles.body}>{body}</Text>
-        <Text style={styles.time}>{time}</Text>
-      </View>
-    </View>
+      <MessageActionsSheet
+        visible={activeMessage !== null}
+        mine={activeMessage?.senderId === user?.id}
+        onClose={() => setActiveMessage(null)}
+        onReact={(emoji) => {
+          if (activeMessage) void handleReact(emoji, activeMessage.id);
+        }}
+        onReply={() => {
+          if (activeMessage) setReplyTo(activeMessage);
+        }}
+        onDelete={() => {
+          if (activeMessage) handleDelete(activeMessage.id);
+        }}
+      />
+    </KeyboardAvoidingView>
   );
 }
 
@@ -190,16 +357,21 @@ const styles = StyleSheet.create({
   container: { flex: 1, backgroundColor: colors.bg },
   loading: { flex: 1, alignItems: 'center', justifyContent: 'center' },
   error: { color: colors.danger, padding: 12, textAlign: 'center' },
-  listContent: { padding: 12, gap: 6 },
-  bubbleWrap: { flexDirection: 'row', marginVertical: 2 },
-  bubbleWrapMine: { justifyContent: 'flex-end' },
-  bubbleWrapOther: { justifyContent: 'flex-start' },
-  bubble: { maxWidth: '78%', padding: 10, borderRadius: 14 },
-  bubbleMine: { backgroundColor: colors.accent },
-  bubbleOther: { backgroundColor: colors.surface, borderColor: colors.border, borderWidth: 1 },
-  sender: { color: colors.textMuted, fontSize: 11, fontWeight: '600', marginBottom: 4 },
-  body: { color: colors.text, fontSize: 15, lineHeight: 20 },
-  time: { color: colors.textDim, fontSize: 10, marginTop: 4, textAlign: 'right' },
+  listContent: { padding: 12 },
+  replyBanner: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    paddingHorizontal: 12,
+    paddingVertical: 8,
+    borderTopWidth: 1,
+    borderTopColor: colors.border,
+    backgroundColor: colors.surface,
+    gap: 12,
+  },
+  replyBannerLeft: { flex: 1 },
+  replyBannerLabel: { color: colors.accent, fontSize: 12, fontWeight: '700' },
+  replyBannerBody: { color: colors.textMuted, fontSize: 13, marginTop: 2 },
+  replyBannerClose: { color: colors.textMuted, fontSize: 22, paddingHorizontal: 6 },
   inputRow: {
     flexDirection: 'row',
     alignItems: 'flex-end',
@@ -209,6 +381,17 @@ const styles = StyleSheet.create({
     borderTopColor: colors.border,
     backgroundColor: colors.surface,
   },
+  plusBtn: {
+    width: 40,
+    height: 40,
+    alignItems: 'center',
+    justifyContent: 'center',
+    backgroundColor: colors.bg,
+    borderRadius: 10,
+    borderColor: colors.border,
+    borderWidth: 1,
+  },
+  plusText: { color: colors.text, fontSize: 20, lineHeight: 22 },
   input: {
     flex: 1,
     minHeight: 40,