diff --git a/README.md b/README.md
index c919df5..8073964 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,14 @@ light/dark mode. Self-hostable via Node.js or Docker Compose.
 - **Pages** — Nested pages (`parent_id`) in workspaces or **books**, icon + cover,
   ordering, TipTap rich-text with **tables + checklists**, stored as JSON + HTML.
 - **Books** 📚 — Independent containers for pages, collapsible in the sidebar.
-- **Tasks** ✅ — Kanban (todo/doing/done), priorities, deadlines, links to books/pages.
+- **Tasks** ✅ — Kanban (todo/doing/doing→done), priorities, deadlines, **assignees**,
+  links to books/pages, **per-team boards**.
+- **Teams** 👥 — Teams with managers/members, **own workspaces** (`TEAM_"name"` badge),
+  permission **groups** (e.g. Team Creators: teams.create/edit/invite, workspace.invite).
+- **Invites + notifications** 🔔 — Pending invites with accept/decline, bell with unread
+  badge (polling + realtime push), notifications for invites and chat messages.
+- **Team chat** 💬 — Realtime workspace channel via Socket.IO.
+- **Uploads** 📤 — Avatar/background images uploadable (served from `/uploads`).
 - **Calendar** 🗓️ — Deadlines from tasks appear automatically.
 - **Time tracking** ⏱️ — Top-right timer, entries linkable to books, history list.
 - **Settings window** ⚙️ — Profile (name, email, avatar, password), appearance
diff --git a/docs/API.md b/docs/API.md
index e879885..821926c 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -84,7 +84,25 @@ Content fields: `content_json` (TipTap JSON), `content_html` (rendered HTML).
 ## Admin (requires `is_admin`)
 
 - `GET /admin/overview` → counts + recent users
-- `GET /admin/users`, `PATCH /admin/users/:id {is_admin}`, `DELETE /admin/users/:id`
+- `GET /admin/users`, `POST /admin/users {name,email,password,is_admin?}` (admins create
+  accounts; public registration is disabled once installed), `PATCH /admin/users/:id`,
+  `DELETE /admin/users/:id`
+
+## Invites & notifications
+
+- `POST /workspaces/:id/members {email,role}` → pending invite + notification
+  (workspace admin+ or `workspace.invite` permission)
+- `GET /invites/mine`, `POST /invites/:id/accept`, `POST /invites/:id/decline`
+- `GET /notifications/mine?unread=1` → `{ notifications, unread }`
+- `PATCH /notifications/:id/read`, `POST /notifications/read-all`
+
+## Chat / teams / groups / upload
+
+- `GET /chat/:workspaceId`, `POST /chat/:workspaceId {body}`, `DELETE /chat/message/:id`
+- `GET /teams/by-workspace/:id`, `POST /teams`, `PATCH/DELETE /teams/:id`,
+  team members CRUD, `POST /teams/:id/workspace {name}` (team workspace + badge)
+- `GET /groups/by-workspace/:id` (seeds `Team Creators`), groups CRUD + members
+- `POST /upload` (multipart image ≤5MB) → `{ url: /uploads/... }`
 
 ## Health
 
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 6eddb08..1565a97 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -4,21 +4,29 @@ import { useAuthStore } from './stores/auth';
 import { useThemeStore } from './stores/theme';
 import { useLocaleStore } from './stores/locale';
 import { useUiStore } from './stores/ui';
+import { fileUrl } from './files';
 import SettingsWindow from './components/SettingsWindow.vue';
 import TimeTrackerButton from './components/TimeTrackerButton.vue';
+import Bell from './components/Bell.vue';
 
 const auth = useAuthStore();
 const theme = useThemeStore();
 const locale = useLocaleStore();
 const ui = useUiStore();
 
+const bgRaw = computed(() => auth.user?.bgImage || '');
+const bgIsImage = computed(() => /^(https?:\/\/|\/uploads|data:)/.test(bgRaw.value));
 const bgStyle = computed(() => {
-  const bg = auth.user?.bgImage || '';
-  if (!bg) return {};
-  const style = { backgroundImage: bg.startsWith('http') ? `url("${bg}")` : bg };
-  if (auth.user?.bgBlur !== false) style.filter = 'blur(14px) brightness(0.85)';
+  if (!bgRaw.value) return {};
+  const style = {
+    backgroundImage: bgIsImage.value ? `url("${fileUrl(bgRaw.value)}")` : bgRaw.value,
+    backgroundSize: 'cover',
+    backgroundPosition: 'center',
+  };
+  if (auth.user?.bgBlur !== false) style.filter = 'blur(16px) brightness(0.9)';
   return style;
 });
+const glassOn = computed(() => !!bgRaw.value && auth.user?.bgGlass !== false);
 
 onMounted(() => {
   locale.set(locale.locale);
@@ -28,9 +36,10 @@ onMounted(() => {
 </script>
 
 <template>
-  <div>
-    <div v-if="bgStyle.backgroundImage" class="bg-layer" :style="bgStyle"></div>
+  <div :class="{ 'has-bg': !!bgRaw, glass: glassOn }">
+    <div v-if="bgRaw" class="bg-layer" :style="bgStyle"></div>
     <div v-if="auth.isLoggedIn" class="top-right">
+      <Bell />
       <TimeTrackerButton />
       <button class="ghost icon-btn" @click="ui.openSettings()" title="⚙️">⚙️</button>
     </div>
diff --git a/frontend/src/assets/style.css b/frontend/src/assets/style.css
index 9ea51e5..f820ce6 100644
--- a/frontend/src/assets/style.css
+++ b/frontend/src/assets/style.css
@@ -239,9 +239,90 @@ input:focus, select:focus { outline: 2px solid var(--accent); border-color: tran
 .toolbar button { padding: 5px 10px; font-size: 13px; }
 .comment { border-top: 1px solid var(--border); padding: 8px 0; }
 
+/* ---- Glassmorphism over background image ---- */
+.has-bg .layout { background: transparent; }
+.glass .sidebar,
+.glass .card,
+.glass .greeting,
+.glass .clock,
+.glass .kanban-col,
+.glass .cal-cell {
+  background: color-mix(in srgb, var(--card) 72%, transparent);
+  backdrop-filter: blur(18px) saturate(1.25);
+  -webkit-backdrop-filter: blur(18px) saturate(1.25);
+}
+
+/* ---- Bell 🔔 ---- */
+.bell { position: relative; }
+.bell-btn { position: relative; }
+.badge {
+  position: absolute; top: -6px; right: -6px;
+  background: #ef4444; color: #fff; font-size: 11px; font-weight: 800;
+  border-radius: 12px; padding: 1px 6px; min-width: 18px; text-align: center;
+}
+.bell-pop {
+  position: absolute; right: 0; top: 44px; width: 330px; z-index: 70;
+  max-height: 60vh; overflow-y: auto; display: grid; gap: 8px;
+}
+.invite-card { padding: 10px; }
+.notif { padding: 8px; border-radius: 8px; cursor: pointer; border-top: 1px solid var(--border); }
+.notif.unread { background: var(--accent-soft); }
+.notif:hover { background: var(--bg-soft); }
+
+/* ---- Chat 💬 ---- */
+.chat-main { display: flex; flex-direction: column; }
+.chat-box {
+  flex: 1; min-height: 50vh; max-height: calc(100vh - 220px);
+  overflow-y: auto; display: flex; flex-direction: column; gap: 10px;
+}
+.chat-msg { display: flex; gap: 8px; align-items: flex-start; }
+.chat-bubble {
+  background: var(--bg-soft); border: 1px solid var(--border);
+  border-radius: 4px 14px 14px 14px; padding: 8px 12px; max-width: 75%;
+  overflow-wrap: anywhere;
+}
+.chat-msg.mine { flex-direction: row-reverse; }
+.chat-msg.mine .chat-bubble { border-radius: 14px 4px 14px 14px; background: var(--accent-soft); }
+.chat-meta { margin-bottom: 2px; }
+
+/* ---- Admin / teams / groups ---- */
+.admin-tabs { margin-bottom: 14px; }
+.team-tabs { margin-bottom: 12px; }
+.team-pill { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border: none; }
+.perm-check { font-size: 13px; }
+.perm-check code {
+  background: var(--bg-soft); border: 1px solid var(--border);
+  border-radius: 6px; padding: 1px 6px; font-size: 12px;
+}
+.side-error {
+  background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca;
+  border-radius: 10px; padding: 8px 10px; font-size: 13px; margin: 0;
+}
+[data-theme='dark'] .side-error { background: #3f1d1d; color: #fca5a5; border-color: #7f2d2d; }
+.ellipsis { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+
+/* ---- Scaling / overflow fixes ---- */
+.main { min-width: 0; }
+.row > input, .row > select { min-width: 0; flex: 1; }
+.row > button { flex-shrink: 0; }
+.sidebar select, .sidebar input { min-width: 0; }
+.table-scroll { overflow-x: auto; }
+.data-table { min-width: 560px; }
+img { max-width: 100%; }
+.topbar { flex-wrap: wrap; }
+input[type='file'] { padding: 4px; }
+
 @media (max-width: 900px) {
   .kanban { grid-template-columns: 1fr; }
   .sidebar { width: 240px; min-width: 240px; }
   .settings-body { flex-direction: column; }
   .settings-tabs { flex-direction: row; border-right: none; border-bottom: 1px solid var(--border); overflow-x: auto; }
 }
+@media (max-width: 640px) {
+  .layout { flex-direction: column; }
+  .sidebar { width: 100%; min-width: 0; max-height: none; position: static; }
+  .main { padding: 16px; }
+  .top-right { top: 8px; right: 8px; }
+  .clock { font-size: 20px; }
+  .greeting { flex-direction: column; align-items: flex-start; }
+}
diff --git a/frontend/src/components/Avatar.vue b/frontend/src/components/Avatar.vue
index 103fd1b..3a8a43d 100644
--- a/frontend/src/components/Avatar.vue
+++ b/frontend/src/components/Avatar.vue
@@ -1,13 +1,20 @@
 <script setup>
 import { computed } from 'vue';
+import { fileUrl } from '../files';
 const props = defineProps({ name: String, avatar: String, size: { type: Number, default: 26 } });
-const isUrl = computed(() => (props.avatar || '').startsWith('http'));
+const src = computed(() => {
+  const a = props.avatar || '';
+  if (a.startsWith('http') || a.startsWith('/uploads') || a.startsWith('data:')) {
+    return fileUrl(a);
+  }
+  return '';
+});
 const letter = computed(() => ((props.name || props.avatar || '?')[0] || '?').toUpperCase());
 </script>
 
 <template>
   <span class="avatar" :style="{ width: size + 'px', height: size + 'px', fontSize: Math.round(size * 0.5) + 'px' }" :title="name">
-    <img v-if="isUrl" :src="avatar" :alt="name" style="width: 100%; height: 100%; border-radius: 50%; object-fit: cover" />
+    <img v-if="src" :src="src" :alt="name" style="width: 100%; height: 100%; border-radius: 50%; object-fit: cover" />
     <span v-else-if="avatar">{{ avatar }}</span>
     <span v-else>{{ letter }}</span>
   </span>
diff --git a/frontend/src/components/Bell.vue b/frontend/src/components/Bell.vue
new file mode 100644
index 0000000..0bcd2d7
--- /dev/null
+++ b/frontend/src/components/Bell.vue
@@ -0,0 +1,107 @@
+<script setup>
+import { computed, onMounted, onUnmounted, ref } from 'vue';
+import { useRouter } from 'vue-router';
+import api from '../api';
+import { getSocket } from '../socket';
+import { useLocaleStore } from '../stores/locale';
+import { useWorkspaceStore } from '../stores/workspace';
+
+const L = useLocaleStore();
+const ws = useWorkspaceStore();
+const router = useRouter();
+
+const open = ref(false);
+const invites = ref([]);
+const notifs = ref([]);
+const unread = ref(0);
+let timer = null;
+
+const total = computed(() => invites.value.length + unread.value);
+
+async function load() {
+  try {
+    const { data } = await api.get('/invites/mine');
+    invites.value = data.invites;
+    const n = await api.get('/notifications/mine');
+    notifs.value = n.data.notifications;
+    unread.value = n.data.unread;
+  } catch { /* offline */ }
+}
+
+async function accept(inv) {
+  await api.post(`/invites/${inv.id}/accept`);
+  invites.value = invites.value.filter((i) => i.id !== inv.id);
+  await ws.fetchWorkspaces();
+  if (ws.currentId) {
+    await ws.fetchBooks();
+    await ws.fetchPages();
+  }
+  router.push('/');
+}
+
+async function decline(inv) {
+  await api.post(`/invites/${inv.id}/decline`);
+  invites.value = invites.value.filter((i) => i.id !== inv.id);
+}
+
+async function markAll() {
+  await api.post('/notifications/read-all');
+  notifs.value.forEach((n) => (n.is_read = true));
+  unread.value = 0;
+}
+
+async function markOne(n) {
+  await api.patch(`/notifications/${n.id}/read`);
+  n.is_read = true;
+  unread.value = Math.max(0, unread.value - 1);
+}
+
+function onPush() {
+  load();
+}
+
+onMounted(() => {
+  load();
+  timer = setInterval(load, 20000);
+  const s = getSocket();
+  s?.on('notification:new', onPush);
+});
+onUnmounted(() => {
+  clearInterval(timer);
+  getSocket()?.off('notification:new', onPush);
+});
+</script>
+
+<template>
+  <div class="bell">
+    <button class="ghost icon-btn bell-btn" @click="open = !open" :title="L.t('bell.title')">
+      🔔<span v-if="total" class="badge">{{ total }}</span>
+    </button>
+    <div v-if="open" class="card bell-pop">
+      <h4 style="margin: 0 0 8px">🔔 {{ L.t('bell.title') }}</h4>
+      <div v-if="invites.length">
+        <div class="side-label">{{ L.t('bell.invites') }}</div>
+        <div v-for="inv in invites" :key="inv.id" class="card invite-card">
+          <strong>{{ inv.workspace_name }}</strong>
+          <div class="muted">{{ L.t('bell.as') }} {{ inv.role }} · {{ inv.inviter_name || '?' }}</div>
+          <div class="row" style="margin-top: 6px">
+            <button class="mini" @click="accept(inv)">✓ {{ L.t('bell.accept') }}</button>
+            <button class="ghost mini" @click="decline(inv)">✕ {{ L.t('bell.decline') }}</button>
+          </div>
+        </div>
+      </div>
+      <div class="side-label">{{ L.t('bell.notifs') }}</div>
+      <div v-if="!notifs.length" class="muted">{{ L.t('bell.empty') }}</div>
+      <div
+        v-for="n in notifs.slice(0, 12)" :key="n.id"
+        class="notif" :class="{ unread: !n.is_read }" @click="markOne(n)"
+      >
+        <strong>{{ n.title }}</strong>
+        <div class="muted">{{ n.body }}</div>
+      </div>
+      <button v-if="unread" class="ghost mini" style="margin-top: 6px" @click="markAll">
+        {{ L.t('bell.readAll') }}
+      </button>
+    </div>
+  </div>
+</template>
diff --git a/frontend/src/components/GreetingHeader.vue b/frontend/src/components/GreetingHeader.vue
index 0f838ee..25d0a7d 100644
--- a/frontend/src/components/GreetingHeader.vue
+++ b/frontend/src/components/GreetingHeader.vue
@@ -12,10 +12,10 @@ onUnmounted(() => clearInterval(timer));
 
 const period = computed(() => {
   const h = now.value.getHours();
-  if (h >= 5 && h < 11) return { key: 'greet.morning', emoji: '🌅' };
-  if (h >= 11 && h < 14) return { key: 'greet.midday', emoji: '🍱' };
-  if (h >= 14 && h < 18) return { key: 'greet.afternoon', emoji: '☀️' };
-  if (h >= 18 && h < 23) return { key: 'greet.evening', emoji: '🌇' };
+  if (h >= 5 && h < 11) return { key: 'greet.morning', emoji: '☀️' };
+  if (h >= 11 && h < 14) return { key: 'greet.midday', emoji: '☕' };
+  if (h >= 14 && h < 18) return { key: 'greet.afternoon', emoji: '🌤️' };
+  if (h >= 18 && h < 23) return { key: 'greet.evening', emoji: '🌆' };
   return { key: 'greet.night', emoji: '🌙' };
 });
 
diff --git a/frontend/src/components/InviteModal.vue b/frontend/src/components/InviteModal.vue
index 95f0e9f..b48000e 100644
--- a/frontend/src/components/InviteModal.vue
+++ b/frontend/src/components/InviteModal.vue
@@ -25,7 +25,7 @@ async function invite() {
   if (!target) return;
   try {
     await api.post(`/workspaces/${props.workspaceId}/members`, { email: target, role: role.value });
-    msg.value = `🎉 ${target} → ${role.value}`;
+    msg.value = `✨ ${target} → ${role.value}`;
     email.value = '';
     picked.value = null;
     emit('invited');
diff --git a/frontend/src/components/SettingsWindow.vue b/frontend/src/components/SettingsWindow.vue
index 4b8191d..2a759f1 100644
--- a/frontend/src/components/SettingsWindow.vue
+++ b/frontend/src/components/SettingsWindow.vue
@@ -1,6 +1,7 @@
 <script setup>
 import { reactive, ref, watch } from 'vue';
 import api from '../api';
+import { uploadImage } from '../files';
 import { useAuthStore } from '../stores/auth';
 import { useLocaleStore } from '../stores/locale';
 import { useThemeStore } from '../stores/theme';
@@ -19,7 +20,9 @@ const msg = ref('');
 const err = ref('');
 const bgUrl = ref('');
 const bgBlur = ref(true);
+const bgGlass = ref(true);
 const bgPreset = ref('none');
+const uploading = ref('');
 
 const GRADIENTS = {
   none: '',
@@ -42,6 +45,7 @@ watch(
         ([, v]) => v && v === auth.user.bgImage,
       )?.[0] || (auth.user.bgImage ? 'custom' : 'none');
       bgBlur.value = auth.user.bgBlur !== false;
+      bgGlass.value = auth.user.bgGlass !== false;
       msg.value = '';
       err.value = '';
     }
@@ -106,13 +110,42 @@ async function saveBackground() {
   msg.value = '';
   err.value = '';
   try {
-    const { data } = await api.patch('/users/me', { bg_image: bgValue(), bg_blur: bgBlur.value });
+    const { data } = await api.patch('/users/me', {
+      bg_image: bgValue(), bg_blur: bgBlur.value, bg_glass: bgGlass.value,
+    });
     persistUser(data.user);
     msg.value = L.t('set.saved');
   } catch (e) {
     err.value = e.response?.data?.error || 'Error';
   }
 }
+
+async function uploadAvatar(e) {
+  const file = e.target.files?.[0];
+  if (!file) return;
+  uploading.value = 'avatar';
+  try {
+    form.avatar = await uploadImage(file);
+  } catch {
+    err.value = 'Upload failed';
+  } finally {
+    uploading.value = '';
+  }
+}
+
+async function uploadBg(e) {
+  const file = e.target.files?.[0];
+  if (!file) return;
+  uploading.value = 'bg';
+  try {
+    bgUrl.value = await uploadImage(file);
+    bgPreset.value = 'custom';
+  } catch {
+    err.value = 'Upload failed';
+  } finally {
+    uploading.value = '';
+  }
+}
 </script>
 
 <template>
@@ -146,6 +179,7 @@ async function saveBackground() {
             <div class="emoji-row">
               <span v-for="e in EMOJIS" :key="e" @click="form.avatar = e">{{ e }}</span>
             </div>
+            <label class="row"><input type="file" accept="image/*" style="width: auto" @change="uploadAvatar" /> {{ uploading === 'avatar' ? '⏳' : L.t('set.upload') }}</label>
             <label>{{ L.t('set.name') }}</label>
             <input v-model="form.name" />
             <label>{{ L.t('set.email') }}</label>
@@ -190,8 +224,10 @@ async function saveBackground() {
             </div>
             <label>{{ L.t('set.bgUrl') }}</label>
             <input v-model="bgUrl" placeholder="https://…" @input="bgPreset = 'custom'" />
+            <label class="row"><input type="file" accept="image/*" style="width: auto" @change="uploadBg" /> {{ uploading === 'bg' ? '⏳' : L.t('set.upload') }}</label>
             <p class="muted">{{ L.t('set.bgUrlHint') }}</p>
             <label class="row"><input type="checkbox" v-model="bgBlur" style="width: auto" /> {{ L.t('set.bgBlur') }}</label>
+            <label class="row"><input type="checkbox" v-model="bgGlass" style="width: auto" /> {{ L.t('set.bgGlass') }}</label>
             <button @click="saveBackground">{{ L.t('set.save') }}</button>
           </div>
 
diff --git a/frontend/src/components/Sidebar.vue b/frontend/src/components/Sidebar.vue
index 2c628de..6aeb722 100644
--- a/frontend/src/components/Sidebar.vue
+++ b/frontend/src/components/Sidebar.vue
@@ -21,6 +21,7 @@ const newPage = ref('');
 const newBook = ref('');
 const search = ref('');
 const results = ref([]);
+const sideErr = ref('');
 const collapsed = ref(JSON.parse(localStorage.getItem('collapsedBooks') || '{}'));
 
 function toggleBook(id) {
@@ -28,9 +29,19 @@ function toggleBook(id) {
   localStorage.setItem('collapsedBooks', JSON.stringify(collapsed.value));
 }
 
+function fail(e, fallback) {
+  sideErr.value = e.response?.data?.error || fallback || 'Error';
+  setTimeout(() => (sideErr.value = ''), 4000);
+}
+
 async function refresh() {
-  await ws.fetchBooks();
-  await ws.fetchPages();
+  try {
+    await ws.fetchWorkspaces();
+    await ws.fetchBooks();
+    await ws.fetchPages();
+  } catch (e) {
+    fail(e);
+  }
 }
 
 async function switchWs(id) {
@@ -40,39 +51,60 @@ async function switchWs(id) {
 
 async function createWs() {
   if (!newWs.value.trim()) return;
-  await ws.createWorkspace(newWs.value.trim());
-  newWs.value = '';
-  await refresh();
+  try {
+    await ws.createWorkspace(newWs.value.trim());
+    newWs.value = '';
+    await refresh();
+  } catch (e) {
+    fail(e);
+  }
 }
 
-async function createPage(bookId = null) {
-  const title = newPage.value.trim() || 'Untitled';
-  const { data } = await api.post('/pages', {
-    workspace_id: ws.currentId, book_id: bookId, title,
-  });
-  newPage.value = '';
-  await ws.fetchPages();
-  router.push(`/page/${data.page.id}`);
+async function createPage(bookId = null, parentId = null) {
+  try {
+    const title = newPage.value.trim() || 'Untitled';
+    const { data } = await api.post('/pages', {
+      workspace_id: ws.currentId, book_id: bookId, parent_id: parentId, title,
+    });
+    newPage.value = '';
+    await ws.fetchPages();
+    router.push(`/page/${data.page.id}`);
+  } catch (e) {
+    fail(e);
+  }
 }
 
 async function createBook() {
   if (!newBook.value.trim()) return;
-  await ws.createBook(newBook.value.trim(), '📚');
-  newBook.value = '';
+  try {
+    await ws.createBook(newBook.value.trim(), '📚');
+    newBook.value = '';
+  } catch (e) {
+    fail(e);
+  }
 }
 
 async function deleteBook(id) {
   if (!confirm('🗑️?')) return;
-  await api.delete(`/books/${id}`);
-  await refresh();
+  try {
+    await api.delete(`/books/${id}`);
+    await ws.fetchBooks();
+    await ws.fetchPages();
+  } catch (e) {
+    fail(e);
+  }
 }
 
 async function doSearch() {
   if (!search.value.trim()) { results.value = []; return; }
-  const { data } = await api.get('/pages/search/query', {
-    params: { q: search.value, workspace_id: ws.currentId },
-  });
-  results.value = data.results;
+  try {
+    const { data } = await api.get('/pages/search/query', {
+      params: { q: search.value, workspace_id: ws.currentId },
+    });
+    results.value = data.results;
+  } catch {
+    results.value = [];
+  }
 }
 
 function logout() {
@@ -87,13 +119,20 @@ onMounted(refresh);
   <aside class="sidebar">
     <div class="user-chip">
       <Avatar :name="auth.user?.name" :avatar="auth.user?.avatar" :size="32" />
-      <strong style="flex: 1">{{ auth.user?.name }}</strong>
+      <strong style="flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis">{{ auth.user?.name }}</strong>
       <button class="ghost icon-btn" @click="ui.openSettings()" title="⚙️">⚙️</button>
     </div>
 
-    <select :value="ws.currentId" @change="switchWs($event.target.value)">
-      <option v-for="w in ws.workspaces" :key="w.id" :value="w.id">{{ w.name }} ({{ w.role }})</option>
-    </select>
+    <p v-if="sideErr" class="side-error">{{ sideErr }}</p>
+
+    <div class="row">
+      <select :value="ws.currentId" @change="switchWs($event.target.value)" style="flex: 1; min-width: 0">
+        <option v-for="w in ws.workspaces" :key="w.id" :value="w.id">
+          {{ w.name }}{{ w.team_name ? ` · TEAM_${w.team_name}` : '' }} ({{ w.role }})
+        </option>
+      </select>
+      <button class="ghost icon-btn" @click="refresh" :title="L.t('side.refresh')">⟳</button>
+    </div>
     <div class="row">
       <input v-model="newWs" :placeholder="L.t('side.newWorkspace')" @keyup.enter="createWs" />
       <button @click="createWs">＋</button>
@@ -104,6 +143,7 @@ onMounted(refresh);
       <router-link to="/tasks">✅ {{ L.t('nav.tasks') }}</router-link>
       <router-link to="/calendar">🗓️ {{ L.t('nav.calendar') }}</router-link>
       <router-link to="/time">⏱️ {{ L.t('nav.time') }}</router-link>
+      <router-link to="/chat">💬 {{ L.t('nav.chat') }}</router-link>
       <router-link v-if="auth.user?.isAdmin" to="/admin">🛡️ {{ L.t('nav.admin') }}</router-link>
     </nav>
 
@@ -121,28 +161,30 @@ onMounted(refresh);
     </div>
     <div v-for="b in ws.books" :key="b.id" class="book">
       <div class="tree-item book-head" @click="toggleBook(b.id)">
-        <span>{{ collapsed[b.id] ? '▶' : '▼' }} {{ b.icon }} {{ b.title }}</span>
-        <span>
-          <button class="ghost mini" @click.stop="createPage(b.id)" title="+">＋</button>
+        <span class="ellipsis">{{ collapsed[b.id] ? '▶' : '▼' }} {{ b.icon }} {{ b.title }}</span>
+        <span class="row">
+          <button class="ghost mini" @click.stop="createPage(b.id, null)" title="+">＋</button>
           <button class="ghost mini" @click.stop="deleteBook(b.id)" title="🗑️">🗑️</button>
         </span>
       </div>
       <div v-if="!collapsed[b.id]" class="book-pages">
         <PageTree
           :nodes="ws.treeFor(b.id)" :active-id="activePageId"
-          @open="router.push(`/page/${$event}`)" @add-child="createPage(b.id)"
+          @open="router.push(`/page/${$event}`)"
+          @add-child="createPage(b.id, $event)"
         />
       </div>
     </div>
 
     <div class="side-label">{{ L.t('side.pages') }}</div>
     <div class="row">
-      <input v-model="newPage" :placeholder="L.t('side.newPagePh')" @keyup.enter="createPage()" />
-      <button @click="createPage()">＋</button>
+      <input v-model="newPage" :placeholder="L.t('side.newPagePh')" @keyup.enter="createPage(null, null)" />
+      <button @click="createPage(null, null)">＋</button>
     </div>
     <PageTree
       :nodes="ws.tree()" :active-id="activePageId"
-      @open="router.push(`/page/${$event}`)" @add-child="createPage()"
+      @open="router.push(`/page/${$event}`)"
+      @add-child="createPage(null, $event)"
     />
 
     <div class="side-footer">
diff --git a/frontend/src/files.js b/frontend/src/files.js
new file mode 100644
index 0000000..4f78e51
--- /dev/null
+++ b/frontend/src/files.js
@@ -0,0 +1,21 @@
+// Resolve avatar/background paths: absolute URLs pass through,
+// relative /uploads/... paths are prefixed with the backend origin.
+export function fileUrl(path) {
+  if (!path) return '';
+  if (/^https?:\/\//i.test(path) || path.startsWith('data:') || path.startsWith('linear-gradient')) {
+    return path;
+  }
+  const apiBase = import.meta.env.VITE_API_URL || 'http://localhost:3000/api';
+  const origin = apiBase.replace(/\/api\/?$/, '');
+  return `${origin}${path.startsWith('/') ? path : `/${path}`}`;
+}
+
+export async function uploadImage(file) {
+  const { default: api } = await import('./api');
+  const form = new FormData();
+  form.append('file', file);
+  const { data } = await api.post('/upload', form, {
+    headers: { 'Content-Type': 'multipart/form-data' },
+  });
+  return data.url; // relative /uploads/... path
+}
diff --git a/frontend/src/i18n/de.js b/frontend/src/i18n/de.js
index 3c67660..6c638f9 100644
--- a/frontend/src/i18n/de.js
+++ b/frontend/src/i18n/de.js
@@ -1,12 +1,37 @@
 export default {
   nav: {
     dashboard: 'Dashboard', tasks: 'Aufgaben', calendar: 'Kalender', time: 'Zeiterfassung',
-    admin: 'Admin', logout: 'Abmelden',
+    admin: 'Admin', logout: 'Abmelden', chat: 'Chat',
   },
   side: {
     workspaces: 'Workspaces', newWorkspace: 'Neuer Workspace', searchPh: 'Seiten suchen …',
     newPagePh: 'Neue Seite', newBookPh: 'Neues Book', books: '📚 Books', pages: '📄 Seiten',
-    members: 'Mitglieder', role: 'Rolle',
+    members: 'Mitglieder', role: 'Rolle', refresh: 'Aktualisieren', teamBadge: 'Team',
+  },
+  auth: {
+    title: 'Willkommen zurück', sub: 'Melde dich an.',
+    email: 'E-Mail', password: 'Passwort', btn: 'Anmelden',
+    locked: '🔒 Accounts werden vom Admin erstellt.',
+  },
+  bell: {
+    title: 'Mitteilungen', invites: 'Einladungen', notifs: 'Neuigkeiten',
+    empty: 'Alles gelesen. ✨', as: 'als', accept: 'Annehmen', decline: 'Ablehnen',
+    readAll: 'Alle als gelesen markieren',
+  },
+  chat: {
+    title: 'Team-Chat', ph: 'Nachricht schreiben …', send: 'Senden',
+    empty: 'Noch keine Nachrichten. Sag Hallo! 👋',
+  },
+  teams: {
+    title: 'Teams', new: 'Neues Team', ph: 'Teamname …',
+    members: 'Mitglieder', makeWs: 'Workspace für Team erstellen',
+    wsName: 'Workspace-Name …', manager: 'Manager', member: 'Mitglied',
+    addMember: 'Hinzufügen', pickUser: 'User wählen …',
+    noTeams: 'Noch keine Teams. Erstelle eins! 🚀',
+  },
+  groups: {
+    title: 'Gruppen & Rechte', new: 'Neue Gruppe', ph: 'Gruppenname …',
+    members: 'Mitglieder', save: 'Speichern', perms: 'Rechte',
   },
   greet: {
     morning: 'Guten Morgen', midday: 'Mahlzeit', afternoon: 'Guten Tag',
@@ -22,14 +47,16 @@ export default {
     save: 'Speichern', saved: 'Gespeichert ✅', theme: 'Farbschema',
     light: '☀️ Hell', dark: '🌙 Dunkel', system: '🖥️ System',
     bgUrl: 'Hintergrundbild-URL', bgUrlHint: 'Leer lassen = kein Bild. Oder Preset wählen:',
-    bgBlur: 'Hintergrund weichzeichnen (Blur)', close: 'Schließen',
+    bgBlur: 'Hintergrund weichzeichnen (Blur)', bgGlass: 'Widgets als Glas darstellen',
+    upload: 'Bild hochladen …', close: 'Schließen',
     presetNone: 'Kein Bild', presetCustom: 'Eigene URL',
   },
   task: {
     title: 'Aufgaben', new: 'Neue Aufgabe', ph: 'Was ist zu tun?',
-    todo: '📝 Offen', doing: '🚧 In Arbeit', done: '✅ Erledigt',
+    todo: '📝 Offen', doing: '⏳ In Arbeit', done: '✅ Erledigt',
     priority: 'Prio', low: 'Niedrig', normal: 'Normal', high: 'Hoch',
     due: 'Fällig', noDue: 'Ohne Termin', book: 'Book', page: 'Seite',
+    team: 'Team', assignee: 'Zuständig', allTeams: 'Alle Teams',
     none: '—', overdue: 'Überfällig!', toTodo: '← Offen', toDoing: 'In Arbeit →',
     toDone: 'Erledigt →', reopen: '↩ Öffnen',
   },
@@ -47,6 +74,7 @@ export default {
     workspaces: 'Workspaces', joined: 'Dabei seit', makeAdmin: 'Zum Admin machen',
     unmake: 'Admin entziehen', del: 'Löschen', confirm: 'Wirklich löschen?',
     you: '(du)', books: 'Books', pages: 'Seiten', tasks: 'Aufgaben', time: 'Zeiteinträge',
+    createUser: 'Benutzer anlegen', newPw: 'Passwort', create: 'Anlegen', created: 'Angelegt ✅',
   },
   c: {
     save: 'Speichern', cancel: 'Abbrechen', delete: 'Löschen', create: 'Anlegen',
diff --git a/frontend/src/i18n/en.js b/frontend/src/i18n/en.js
index 637c165..91f3900 100644
--- a/frontend/src/i18n/en.js
+++ b/frontend/src/i18n/en.js
@@ -1,12 +1,37 @@
 export default {
   nav: {
     dashboard: 'Dashboard', tasks: 'Tasks', calendar: 'Calendar', time: 'Time tracking',
-    admin: 'Admin', logout: 'Log out',
+    admin: 'Admin', logout: 'Log out', chat: 'Chat',
   },
   side: {
     workspaces: 'Workspaces', newWorkspace: 'New workspace', searchPh: 'Search pages …',
     newPagePh: 'New page', newBookPh: 'New book', books: '📚 Books', pages: '📄 Pages',
-    members: 'Members', role: 'Role',
+    members: 'Members', role: 'Role', refresh: 'Refresh', teamBadge: 'Team',
+  },
+  auth: {
+    title: 'Welcome back', sub: 'Log in to your workspace.',
+    email: 'Email', password: 'Password', btn: 'Log in',
+    locked: '🔒 Accounts are created by an admin.',
+  },
+  bell: {
+    title: 'Notifications', invites: 'Invites', notifs: 'Updates',
+    empty: 'All caught up. ✨', as: 'as', accept: 'Accept', decline: 'Decline',
+    readAll: 'Mark all as read',
+  },
+  chat: {
+    title: 'Team chat', ph: 'Write a message …', send: 'Send',
+    empty: 'No messages yet. Say hi! 👋',
+  },
+  teams: {
+    title: 'Teams', new: 'New team', ph: 'Team name …',
+    members: 'Members', makeWs: 'Create workspace for team',
+    wsName: 'Workspace name …', manager: 'Manager', member: 'Member',
+    addMember: 'Add', pickUser: 'Pick user …',
+    noTeams: 'No teams yet. Create one! 🚀',
+  },
+  groups: {
+    title: 'Groups & permissions', new: 'New group', ph: 'Group name …',
+    members: 'Members', save: 'Save', perms: 'Permissions',
   },
   greet: {
     morning: 'Good morning', midday: 'Enjoy your lunch', afternoon: 'Good afternoon',
@@ -22,14 +47,16 @@ export default {
     save: 'Save', saved: 'Saved ✅', theme: 'Color scheme',
     light: '☀️ Light', dark: '🌙 Dark', system: '🖥️ System',
     bgUrl: 'Background image URL', bgUrlHint: 'Empty = no image. Or pick a preset:',
-    bgBlur: 'Blur background', close: 'Close',
+    bgBlur: 'Blur background', bgGlass: 'Glassmorphism widgets',
+    upload: 'Upload image …', close: 'Close',
     presetNone: 'No image', presetCustom: 'Custom URL',
   },
   task: {
     title: 'Tasks', new: 'New task', ph: 'What needs doing?',
-    todo: '📝 Todo', doing: '🚧 Doing', done: '✅ Done',
+    todo: '📝 Todo', doing: '⏳ Doing', done: '✅ Done',
     priority: 'Priority', low: 'Low', normal: 'Normal', high: 'High',
     due: 'Due', noDue: 'No due date', book: 'Book', page: 'Page',
+    team: 'Team', assignee: 'Assignee', allTeams: 'All teams',
     none: '—', overdue: 'Overdue!', toTodo: '← Todo', toDoing: 'Doing →',
     toDone: 'Done →', reopen: '↩ Reopen',
   },
@@ -47,6 +74,7 @@ export default {
     workspaces: 'Workspaces', joined: 'Joined', makeAdmin: 'Make admin',
     unmake: 'Remove admin', del: 'Delete', confirm: 'Really delete?',
     you: '(you)', books: 'Books', pages: 'Pages', tasks: 'Tasks', time: 'Time entries',
+    createUser: 'Create user', newPw: 'Password', create: 'Create', created: 'Created ✅',
   },
   c: {
     save: 'Save', cancel: 'Cancel', delete: 'Delete', create: 'Create',
diff --git a/frontend/src/i18n/zh.js b/frontend/src/i18n/zh.js
index f1af06f..e0f7960 100644
--- a/frontend/src/i18n/zh.js
+++ b/frontend/src/i18n/zh.js
@@ -1,12 +1,37 @@
 export default {
   nav: {
     dashboard: '仪表盘', tasks: '任务', calendar: '日历', time: '时间记录',
-    admin: '管理', logout: '退出登录',
+    admin: '管理', logout: '退出登录', chat: '聊天',
   },
   side: {
     workspaces: '工作区', newWorkspace: '新建工作区', searchPh: '搜索页面 …',
     newPagePh: '新建页面', newBookPh: '新建书册', books: '📚 书册', pages: '📄 页面',
-    members: '成员', role: '角色',
+    members: '成员', role: '角色', refresh: '刷新', teamBadge: '团队',
+  },
+  auth: {
+    title: '欢迎回来', sub: '登录到你的工作区。',
+    email: '电子邮件', password: '密码', btn: '登录',
+    locked: '🔒 账号由管理员创建。',
+  },
+  bell: {
+    title: '通知', invites: '邀请', notifs: '动态',
+    empty: '全部已读。✨', as: '以', accept: '接受', decline: '拒绝',
+    readAll: '全部标为已读',
+  },
+  chat: {
+    title: '团队聊天', ph: '写消息 …', send: '发送',
+    empty: '还没有消息，打个招呼吧！👋',
+  },
+  teams: {
+    title: '团队', new: '新建团队', ph: '团队名称 …',
+    members: '成员', makeWs: '为团队创建工作区',
+    wsName: '工作区名称 …', manager: '管理员', member: '成员',
+    addMember: '添加', pickUser: '选择用户 …',
+    noTeams: '还没有团队，创建一个吧！🚀',
+  },
+  groups: {
+    title: '分组与权限', new: '新建分组', ph: '分组名称 …',
+    members: '成员', save: '保存', perms: '权限',
   },
   greet: {
     morning: '早上好', midday: '午餐愉快', afternoon: '下午好',
@@ -22,14 +47,16 @@ export default {
     save: '保存', saved: '已保存 ✅', theme: '配色方案',
     light: '☀️ 浅色', dark: '🌙 深色', system: '🖥️ 跟随系统',
     bgUrl: '背景图片链接', bgUrlHint: '留空 = 无背景，或选择预设：',
-    bgBlur: '模糊背景', close: '关闭',
+    bgBlur: '模糊背景', bgGlass: '玻璃拟态组件',
+    upload: '上传图片 …', close: '关闭',
     presetNone: '无背景', presetCustom: '自定义链接',
   },
   task: {
     title: '任务', new: '新建任务', ph: '要做什么？',
-    todo: '📝 待办', doing: '🚧 进行中', done: '✅ 已完成',
+    todo: '📝 待办', doing: '⏳ 进行中', done: '✅ 已完成',
     priority: '优先级', low: '低', normal: '中', high: '高',
     due: '截止', noDue: '无截止日期', book: '书册', page: '页面',
+    team: '团队', assignee: '负责人', allTeams: '全部团队',
     none: '—', overdue: '已逾期！', toTodo: '← 待办', toDoing: '进行中 →',
     toDone: '完成 →', reopen: '↩ 重新打开',
   },
@@ -47,6 +74,7 @@ export default {
     workspaces: '工作区', joined: '加入时间', makeAdmin: '设为管理员',
     unmake: '取消管理员', del: '删除', confirm: '确认删除？',
     you: '（你）', books: '书册', pages: '页面', tasks: '任务', time: '时间记录',
+    createUser: '创建用户', newPw: '密码', create: '创建', created: '已创建 ✅',
   },
   c: {
     save: '保存', cancel: '取消', delete: '删除', create: '创建',
diff --git a/frontend/src/router/index.js b/frontend/src/router/index.js
index d6fd5bd..9803122 100644
--- a/frontend/src/router/index.js
+++ b/frontend/src/router/index.js
@@ -2,24 +2,24 @@ import { createRouter, createWebHistory } from 'vue-router';
 import { useAuthStore } from '../stores/auth';
 import { useSetupStore } from '../stores/setup';
 import Login from '../views/Login.vue';
-import Register from '../views/Register.vue';
 import Setup from '../views/Setup.vue';
 import Dashboard from '../views/Dashboard.vue';
 import PageEditor from '../views/PageEditor.vue';
 import Tasks from '../views/Tasks.vue';
 import Calendar from '../views/Calendar.vue';
 import Time from '../views/Time.vue';
+import Chat from '../views/Chat.vue';
 import Admin from '../views/Admin.vue';
 
 const routes = [
   { path: '/setup', component: Setup },
   { path: '/login', component: Login, meta: { guest: true } },
-  { path: '/register', component: Register, meta: { guest: true } },
   { path: '/', component: Dashboard, meta: { auth: true } },
   { path: '/page/:id', component: PageEditor, meta: { auth: true } },
   { path: '/tasks', component: Tasks, meta: { auth: true } },
   { path: '/calendar', component: Calendar, meta: { auth: true } },
   { path: '/time', component: Time, meta: { auth: true } },
+  { path: '/chat', component: Chat, meta: { auth: true } },
   { path: '/admin', component: Admin, meta: { auth: true, admin: true } },
 ];
 
diff --git a/frontend/src/views/Admin.vue b/frontend/src/views/Admin.vue
index 4727a09..992e080 100644
--- a/frontend/src/views/Admin.vue
+++ b/frontend/src/views/Admin.vue
@@ -1,36 +1,152 @@
 <script setup>
-import { onMounted, ref } from 'vue';
+import { onMounted, reactive, ref } from 'vue';
 import api from '../api';
+import { useWorkspaceStore } from '../stores/workspace';
 import { useLocaleStore } from '../stores/locale';
 import Sidebar from '../components/Sidebar.vue';
 import Avatar from '../components/Avatar.vue';
 
 const L = useLocaleStore();
+const ws = useWorkspaceStore();
+const tab = ref('overview');
+
 const counts = ref({});
 const users = ref([]);
-const recent = ref([]);
+const newUser = reactive({ name: '', email: '', password: '', is_admin: false });
+const userMsg = ref('');
 
-async function load() {
+const teams = ref([]);
+const newTeam = ref('');
+const teamMembers = ref({});
+const teamWsName = ref({});
+const members = ref([]);
+
+const groups = ref([]);
+const availPerms = ref([]);
+const newGroup = ref('');
+const newPerms = ref([]);
+const groupMembers = ref({});
+
+async function loadOverview() {
   const { data } = await api.get('/admin/overview');
   counts.value = data.counts;
-  recent.value = data.recentUsers;
-  const u = await api.get('/admin/users');
-  users.value = u.data.users;
 }
-
+async function loadUsers() {
+  const { data } = await api.get('/admin/users');
+  users.value = data.users;
+}
+async function createUser() {
+  userMsg.value = '';
+  try {
+    const { data } = await api.post('/admin/users', { ...newUser });
+    users.value.push({ ...data.user, workspaces: 0 });
+    newUser.name = '';
+    newUser.email = '';
+    newUser.password = '';
+    newUser.is_admin = false;
+    userMsg.value = L.t('admin.created');
+  } catch (e) {
+    userMsg.value = e.response?.data?.error || 'Error';
+  }
+}
 async function setAdmin(u, val) {
   const { data } = await api.patch(`/admin/users/${u.id}`, { is_admin: val });
   u.is_admin = data.user.is_admin;
-  load();
 }
-
 async function removeUser(u) {
   if (!confirm(`${L.t('admin.confirm')} (${u.email})`)) return;
   await api.delete(`/admin/users/${u.id}`);
   users.value = users.value.filter((x) => x.id !== u.id);
 }
 
-onMounted(load);
+async function loadTeams() {
+  if (!ws.currentId) return;
+  const { data } = await api.get(`/teams/by-workspace/${ws.currentId}`);
+  teams.value = data.teams;
+  const m = await api.get(`/workspaces/${ws.currentId}/members`);
+  members.value = m.data.members;
+}
+async function createTeam() {
+  if (!newTeam.value.trim()) return;
+  const { data } = await api.post('/teams', { workspace_id: ws.currentId, name: newTeam.value.trim() });
+  teams.value.push(data.team);
+  newTeam.value = '';
+}
+async function removeTeam(t) {
+  if (!confirm('🗑️?')) return;
+  await api.delete(`/teams/${t.id}`);
+  teams.value = teams.value.filter((x) => x.id !== t.id);
+}
+async function showTeamMembers(t) {
+  const { data } = await api.get(`/teams/${t.id}/members`);
+  teamMembers.value[t.id] = data.members;
+}
+async function addTeamMember(t, userId, role) {
+  if (!userId) return;
+  await api.post(`/teams/${t.id}/members`, { user_id: userId, role });
+  showTeamMembers(t);
+}
+async function removeTeamMember(t, userId) {
+  await api.delete(`/teams/${t.id}/members/${userId}`);
+  showTeamMembers(t);
+}
+async function makeTeamWs(t) {
+  const name = teamWsName.value[t.id]?.trim();
+  if (!name) return;
+  const { data } = await api.post(`/teams/${t.id}/workspace`, { name });
+  teamWsName.value[t.id] = '';
+  await ws.fetchWorkspaces();
+  alert(`✓ ${data.workspace.name} · TEAM_${t.name}`);
+}
+
+async function loadGroups() {
+  if (!ws.currentId) return;
+  const { data } = await api.get(`/groups/by-workspace/${ws.currentId}`);
+  groups.value = data.groups;
+  availPerms.value = data.availablePermissions;
+}
+async function createGroup() {
+  if (!newGroup.value.trim()) return;
+  const { data } = await api.post('/groups', {
+    workspace_id: ws.currentId, name: newGroup.value.trim(), permissions: newPerms.value,
+  });
+  groups.value.push(data.group);
+  newGroup.value = '';
+  newPerms.value = [];
+}
+async function togglePerm(g, perm) {
+  const perms = new Set(g.permissions || []);
+  if (perms.has(perm)) perms.delete(perm);
+  else perms.add(perm);
+  const { data } = await api.patch(`/groups/${g.id}`, { permissions: [...perms] });
+  g.permissions = data.group.permissions;
+}
+async function removeGroup(g) {
+  if (!confirm('🗑️?')) return;
+  await api.delete(`/groups/${g.id}`);
+  groups.value = groups.value.filter((x) => x.id !== g.id);
+}
+async function showGroupMembers(g) {
+  const { data } = await api.get(`/groups/${g.id}/members`);
+  groupMembers.value[g.id] = data.members;
+}
+async function addGroupMember(g, userId) {
+  if (!userId) return;
+  await api.post(`/groups/${g.id}/members`, { user_id: userId });
+  showGroupMembers(g);
+}
+async function removeGroupMember(g, userId) {
+  await api.delete(`/groups/${g.id}/members/${userId}`);
+  showGroupMembers(g);
+}
+
+onMounted(async () => {
+  if (!ws.workspaces.length) await ws.fetchWorkspaces();
+  await loadOverview();
+  await loadUsers();
+  await loadTeams();
+  await loadGroups();
+});
 </script>
 
 <template>
@@ -38,45 +154,139 @@ onMounted(load);
     <Sidebar />
     <main class="main">
       <h2>🛡️ {{ L.t('admin.title') }}</h2>
-      <h3>{{ L.t('admin.overview') }}</h3>
-      <div class="stat-grid">
-        <div class="card stat">👥<strong>{{ counts.users }}</strong>{{ L.t('admin.users') }}</div>
-        <div class="card stat">🏠<strong>{{ counts.workspaces }}</strong>{{ L.t('nav.dashboard') }}</div>
-        <div class="card stat">📚<strong>{{ counts.books }}</strong>{{ L.t('admin.books') }}</div>
-        <div class="card stat">📄<strong>{{ counts.pages }}</strong>{{ L.t('admin.pages') }}</div>
-        <div class="card stat">✅<strong>{{ counts.tasks }}</strong>{{ L.t('admin.tasks') }}</div>
-        <div class="card stat">⏱️<strong>{{ counts.timeEntries }}</strong>{{ L.t('admin.time') }}</div>
+      <div class="row wrap admin-tabs">
+        <button :class="{ ghost: tab !== 'overview' }" @click="tab = 'overview'">{{ L.t('admin.overview') }}</button>
+        <button :class="{ ghost: tab !== 'users' }" @click="tab = 'users'">{{ L.t('admin.users') }}</button>
+        <button :class="{ ghost: tab !== 'teams' }" @click="tab = 'teams'">👥 {{ L.t('teams.title') }}</button>
+        <button :class="{ ghost: tab !== 'groups' }" @click="tab = 'groups'">🔑 {{ L.t('groups.title') }}</button>
       </div>
-      <h3>{{ L.t('admin.users') }} ({{ users.length }})</h3>
-      <div class="card">
-        <table class="data-table">
-          <thead>
-            <tr>
-              <th></th>
-              <th>{{ L.t('admin.name') }}</th>
-              <th>{{ L.t('admin.email') }}</th>
-              <th>{{ L.t('admin.role') }}</th>
-              <th>{{ L.t('admin.workspaces') }}</th>
-              <th>{{ L.t('admin.joined') }}</th>
-              <th></th>
-            </tr>
-          </thead>
-          <tbody>
-            <tr v-for="u in users" :key="u.id">
-              <td><Avatar :name="u.name" :size="24" /></td>
-              <td><strong>{{ u.name }}</strong></td>
-              <td class="muted">{{ u.email }}</td>
-              <td>{{ u.is_admin ? `⭐ ${L.t('admin.admin')}` : L.t('admin.user') }}</td>
-              <td>{{ u.workspaces }}</td>
-              <td class="muted">{{ new Date(u.created_at).toLocaleDateString() }}</td>
-              <td class="row">
-                <button v-if="!u.is_admin" class="ghost mini" @click="setAdmin(u, true)">{{ L.t('admin.makeAdmin') }}</button>
-                <button v-else class="ghost mini" @click="setAdmin(u, false)">{{ L.t('admin.unmake') }}</button>
-                <button class="ghost mini" @click="removeUser(u)">🗑️</button>
-              </td>
-            </tr>
-          </tbody>
-        </table>
+
+      <div v-if="tab === 'overview'">
+        <div class="stat-grid">
+          <div class="card stat">👥<strong>{{ counts.users }}</strong>{{ L.t('admin.users') }}</div>
+          <div class="card stat">🏠<strong>{{ counts.workspaces }}</strong>Workspaces</div>
+          <div class="card stat">📚<strong>{{ counts.books }}</strong>{{ L.t('admin.books') }}</div>
+          <div class="card stat">📄<strong>{{ counts.pages }}</strong>{{ L.t('admin.pages') }}</div>
+          <div class="card stat">✅<strong>{{ counts.tasks }}</strong>{{ L.t('admin.tasks') }}</div>
+          <div class="card stat">⏱️<strong>{{ counts.timeEntries }}</strong>{{ L.t('admin.time') }}</div>
+        </div>
+      </div>
+
+      <div v-if="tab === 'users'">
+        <div class="card" style="margin-bottom: 12px">
+          <h4>＋ {{ L.t('admin.createUser') }}</h4>
+          <div class="row wrap">
+            <input v-model="newUser.name" :placeholder="L.t('admin.name')" />
+            <input v-model="newUser.email" type="email" :placeholder="L.t('admin.email')" />
+            <input v-model="newUser.password" type="password" :placeholder="L.t('admin.newPw')" />
+            <label class="row"><input type="checkbox" v-model="newUser.is_admin" style="width: auto" /> {{ L.t('admin.admin') }}</label>
+            <button @click="createUser">{{ L.t('admin.create') }}</button>
+          </div>
+          <p v-if="userMsg" class="muted">{{ userMsg }}</p>
+        </div>
+        <div class="card table-scroll">
+          <table class="data-table">
+            <thead>
+              <tr>
+                <th></th><th>{{ L.t('admin.name') }}</th><th>{{ L.t('admin.email') }}</th>
+                <th>{{ L.t('admin.role') }}</th><th>{{ L.t('admin.workspaces') }}</th>
+                <th>{{ L.t('admin.joined') }}</th><th></th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr v-for="u in users" :key="u.id">
+                <td><Avatar :name="u.name" :size="24" /></td>
+                <td><strong>{{ u.name }}</strong></td>
+                <td class="muted">{{ u.email }}</td>
+                <td>{{ u.is_admin ? `⭐ ${L.t('admin.admin')}` : L.t('admin.user') }}</td>
+                <td>{{ u.workspaces }}</td>
+                <td class="muted">{{ new Date(u.created_at).toLocaleDateString() }}</td>
+                <td class="row">
+                  <button v-if="!u.is_admin" class="ghost mini" @click="setAdmin(u, true)">{{ L.t('admin.makeAdmin') }}</button>
+                  <button v-else class="ghost mini" @click="setAdmin(u, false)">{{ L.t('admin.unmake') }}</button>
+                  <button class="ghost mini" @click="removeUser(u)">🗑️</button>
+                </td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
+      </div>
+
+      <div v-if="tab === 'teams'">
+        <div class="card" style="margin-bottom: 12px">
+          <h4>＋ {{ L.t('teams.new') }}</h4>
+          <div class="row">
+            <input v-model="newTeam" :placeholder="L.t('teams.ph')" @keyup.enter="createTeam" />
+            <button @click="createTeam">{{ L.t('c.create') }}</button>
+          </div>
+        </div>
+        <p v-if="!teams.length" class="muted">{{ L.t('teams.noTeams') }}</p>
+        <div v-for="t in teams" :key="t.id" class="card" style="margin-bottom: 10px">
+          <div class="row" style="justify-content: space-between">
+            <strong>{{ t.icon }} {{ t.name }} <span class="muted">({{ t.members }})</span></strong>
+            <button class="ghost mini" @click="removeTeam(t)">🗑️</button>
+          </div>
+          <div class="row wrap" style="margin-top: 8px">
+            <button class="ghost mini" @click="showTeamMembers(t)">👥 {{ L.t('teams.members') }}</button>
+            <input v-model="teamWsName[t.id]" :placeholder="L.t('teams.wsName')" style="max-width: 220px" />
+            <button class="ghost mini" @click="makeTeamWs(t)">🏠 {{ L.t('teams.makeWs') }}</button>
+          </div>
+          <div v-if="teamMembers[t.id]?.length" style="margin-top: 8px">
+            <div v-for="m in teamMembers[t.id]" :key="m.id" class="row member-row">
+              <Avatar :name="m.name" :avatar="m.avatar" :size="24" />
+              <span style="flex: 1">{{ m.name }}</span>
+              <span class="pill">{{ m.role }}</span>
+              <button class="ghost mini" @click="removeTeamMember(t, m.id)">✕</button>
+            </div>
+          </div>
+          <div class="row" style="margin-top: 8px">
+            <select @change="addTeamMember(t, $event.target.value, 'member'); $event.target.value = ''" style="max-width: 200px">
+              <option value="">{{ L.t('teams.pickUser') }}</option>
+              <option v-for="m in members" :key="m.id" :value="m.id">{{ m.name }}</option>
+            </select>
+          </div>
+        </div>
+      </div>
+
+      <div v-if="tab === 'groups'">
+        <div class="card" style="margin-bottom: 12px">
+          <h4>＋ {{ L.t('groups.new') }}</h4>
+          <div class="row wrap">
+            <input v-model="newGroup" :placeholder="L.t('groups.ph')" @keyup.enter="createGroup" style="flex: 1" />
+            <button @click="createGroup">{{ L.t('c.create') }}</button>
+          </div>
+          <div class="row wrap" style="margin-top: 8px">
+            <label v-for="p in availPerms" :key="p" class="row perm-check">
+              <input type="checkbox" :value="p" v-model="newPerms" style="width: auto" /> <code>{{ p }}</code>
+            </label>
+          </div>
+        </div>
+        <div v-for="g in groups" :key="g.id" class="card" style="margin-bottom: 10px">
+          <div class="row" style="justify-content: space-between">
+            <strong>🔑 {{ g.name }} <span class="muted">({{ g.members }})</span></strong>
+            <button class="ghost mini" @click="removeGroup(g)">🗑️</button>
+          </div>
+          <div class="muted">{{ L.t('groups.perms') }}:</div>
+          <div class="row wrap">
+            <label v-for="p in availPerms" :key="p" class="row perm-check">
+              <input type="checkbox" :checked="(g.permissions || []).includes(p)" @change="togglePerm(g, p)" style="width: auto" /> <code>{{ p }}</code>
+            </label>
+          </div>
+          <div class="row" style="margin-top: 8px">
+            <button class="ghost mini" @click="showGroupMembers(g)">👥 {{ L.t('groups.members') }}</button>
+            <select @change="addGroupMember(g, $event.target.value); $event.target.value = ''" style="max-width: 200px">
+              <option value="">{{ L.t('teams.pickUser') }}</option>
+              <option v-for="m in members" :key="m.id" :value="m.id">{{ m.name }}</option>
+            </select>
+          </div>
+          <div v-if="groupMembers[g.id]?.length" style="margin-top: 8px">
+            <div v-for="m in groupMembers[g.id]" :key="m.id" class="row member-row">
+              <Avatar :name="m.name" :avatar="m.avatar" :size="24" />
+              <span style="flex: 1">{{ m.name }}</span>
+              <button class="ghost mini" @click="removeGroupMember(g, m.id)">✕</button>
+            </div>
+          </div>
+        </div>
       </div>
     </main>
   </div>
diff --git a/frontend/src/views/Chat.vue b/frontend/src/views/Chat.vue
new file mode 100644
index 0000000..42cd049
--- /dev/null
+++ b/frontend/src/views/Chat.vue
@@ -0,0 +1,96 @@
+<script setup>
+import { nextTick, onMounted, onUnmounted, ref, watch } from 'vue';
+import api from '../api';
+import { connectSocket, getSocket } from '../socket';
+import { useWorkspaceStore } from '../stores/workspace';
+import { useAuthStore } from '../stores/auth';
+import { useLocaleStore } from '../stores/locale';
+import Sidebar from '../components/Sidebar.vue';
+import Avatar from '../components/Avatar.vue';
+
+const ws = useWorkspaceStore();
+const auth = useAuthStore();
+const L = useLocaleStore();
+const messages = ref([]);
+const body = ref('');
+const box = ref(null);
+
+function scrollDown() {
+  nextTick(() => {
+    if (box.value) box.value.scrollTop = box.value.scrollHeight;
+  });
+}
+
+async function load() {
+  if (!ws.currentId) return;
+  const { data } = await api.get(`/chat/${ws.currentId}`);
+  messages.value = data.messages;
+  const s = connectSocket();
+  s?.emit('chat:join', { workspaceId: ws.currentId });
+  scrollDown();
+}
+
+function onMsg({ message }) {
+  if (message.workspace_id !== ws.currentId) return;
+  messages.value.push(message);
+  scrollDown();
+}
+function onDel({ id }) {
+  messages.value = messages.value.filter((m) => m.id !== id);
+}
+
+async function send() {
+  const text = body.value.trim();
+  if (!text) return;
+  body.value = '';
+  await api.post(`/chat/${ws.currentId}`, { body: text });
+}
+
+async function remove(id) {
+  await api.delete(`/chat/message/${id}`);
+}
+
+onMounted(async () => {
+  if (!ws.workspaces.length) await ws.fetchWorkspaces();
+  await load();
+  const s = getSocket();
+  s?.on('chat:message', onMsg);
+  s?.on('chat:deleted', onDel);
+});
+onUnmounted(() => {
+  const s = getSocket();
+  s?.off('chat:message', onMsg);
+  s?.off('chat:deleted', onDel);
+});
+watch(() => ws.currentId, load);
+</script>
+
+<template>
+  <div class="layout">
+    <Sidebar />
+    <main class="main chat-main">
+      <h2>💬 {{ L.t('chat.title') }}</h2>
+      <div ref="box" class="card chat-box">
+        <div
+          v-for="m in messages" :key="m.id"
+          class="chat-msg" :class="{ mine: m.user_id === auth.user?.id }"
+        >
+          <Avatar :name="m.author_name" :avatar="m.author_avatar" :size="30" />
+          <div class="chat-bubble">
+            <div class="muted chat-meta">
+              <strong>{{ m.author_name || '?' }}</strong> ·
+              {{ new Date(m.created_at).toLocaleString() }}
+              <span v-if="m.user_id === auth.user?.id" class="link" @click="remove(m.id)"> 🗑</span>
+            </div>
+            <div>{{ m.body }}</div>
+          </div>
+        </div>
+        <p v-if="!messages.length" class="muted">{{ L.t('chat.empty') }}</p>
+      </div>
+      <div class="row" style="margin-top: 8px">
+        <input v-model="body" :placeholder="L.t('chat.ph')" @keyup.enter="send" />
+        <button @click="send">{{ L.t('chat.send') }}</button>
+      </div>
+    </main>
+  </div>
+</template>
diff --git a/frontend/src/views/Dashboard.vue b/frontend/src/views/Dashboard.vue
index f6b15af..68716d3 100644
--- a/frontend/src/views/Dashboard.vue
+++ b/frontend/src/views/Dashboard.vue
@@ -21,6 +21,7 @@ async function fetchMembers() {
 }
 
 const currentName = computed(() => ws.workspaces.find((w) => w.id === ws.currentId)?.name || '');
+const currentTeam = computed(() => ws.workspaces.find((w) => w.id === ws.currentId)?.team_name || '');
 
 onMounted(async () => {
   await auth.fetchMe().catch(() => {});
@@ -36,7 +37,7 @@ onMounted(async () => {
     <Sidebar />
     <main class="main">
       <GreetingHeader :name="auth.user?.name" />
-      <p class="muted">🏠 {{ currentName }} · {{ L.t('side.role') || ws.role }}: <strong>{{ ws.role }}</strong></p>
+      <p class="muted">🏠 {{ currentName }} <span v-if="currentTeam" class="pill team-pill">TEAM_{{ currentTeam }}</span> · {{ L.t('side.role') }}: <strong>{{ ws.role }}</strong></p>
       <InviteModal v-if="ws.currentId" :workspace-id="ws.currentId" @invited="fetchMembers" />
       <div class="card" style="margin-top: 12px">
         <h4>👥 {{ L.t('side.members') }} ({{ members.length }})</h4>
diff --git a/frontend/src/views/Login.vue b/frontend/src/views/Login.vue
index a7574bb..9c67587 100644
--- a/frontend/src/views/Login.vue
+++ b/frontend/src/views/Login.vue
@@ -2,6 +2,9 @@
 import { ref } from 'vue';
 import { useRouter } from 'vue-router';
 import { useAuthStore } from '../stores/auth';
+import { useLocaleStore } from '../stores/locale';
+
+const L = useLocaleStore();
 
 const email = ref('');
 const password = ref('');
@@ -22,14 +25,14 @@ async function submit() {
 
 <template>
   <div class="auth-wrap card">
-    <h1>Welcome back</h1>
-    <p class="muted">Log in to your workspace.</p>
+    <h1>{{ L.t('auth.title') }}</h1>
+    <p class="muted">{{ L.t('auth.sub') }}</p>
     <form @submit.prevent="submit" style="display: grid; gap: 10px">
-      <input v-model="email" type="email" placeholder="Email" required />
-      <input v-model="password" type="password" placeholder="Password" required />
-      <button type="submit">Login</button>
+      <input v-model="email" type="email" :placeholder="L.t('auth.email')" required />
+      <input v-model="password" type="password" :placeholder="L.t('auth.password')" required />
+      <button type="submit">{{ L.t('auth.btn') }}</button>
     </form>
     <p v-if="err" style="color: red">{{ err }}</p>
-    <p class="muted">No account? <router-link to="/register">Register</router-link></p>
+    <p class="muted">{{ L.t('auth.locked') }}</p>
   </div>
 </template>
diff --git a/frontend/src/views/PageEditor.vue b/frontend/src/views/PageEditor.vue
index 85255c9..5a1a760 100644
--- a/frontend/src/views/PageEditor.vue
+++ b/frontend/src/views/PageEditor.vue
@@ -158,7 +158,7 @@ onUnmounted(() => {
         <button class="ghost" @click="editor?.chain().focus().toggleHeading({ level: 2 }).run()">H2</button>
         <button class="ghost" @click="editor?.chain().focus().toggleBulletList().run()">• {{ L.t('side.pages') }}</button>
         <button class="ghost" @click="editor?.chain().focus().toggleTaskList().run()">☑️</button>
-        <button class="ghost" @click="editor?.chain().focus().insertTable({ rows: 3, cols: 3 }).run()">▦ Table</button>
+        <button class="ghost" @click="editor?.chain().focus().insertTable({ rows: 3, cols: 3 }).run()">⊞ Table</button>
         <button class="ghost" @click="editor?.chain().focus().toggleCodeBlock().run()">&lt;/&gt;</button>
         <button @click="save()">💾 {{ L.t('c.save') }}</button>
       </div>
diff --git a/frontend/src/views/Register.vue b/frontend/src/views/Register.vue
deleted file mode 100644
index 4ed46fb..0000000
--- a/frontend/src/views/Register.vue
+++ /dev/null
@@ -1,37 +0,0 @@
-<script setup>
-import { ref } from 'vue';
-import { useRouter } from 'vue-router';
-import { useAuthStore } from '../stores/auth';
-
-const email = ref('');
-const name = ref('');
-const password = ref('');
-const err = ref('');
-const router = useRouter();
-const auth = useAuthStore();
-
-async function submit() {
-  err.value = '';
-  try {
-    await auth.register(email.value, name.value, password.value);
-    router.push('/');
-  } catch (e) {
-    err.value = e.response?.data?.error || 'Registration failed';
-  }
-}
-</script>
-
-<template>
-  <div class="auth-wrap card">
-    <h1>Create account</h1>
-    <p class="muted">Start your collaborative workspace.</p>
-    <form @submit.prevent="submit" style="display: grid; gap: 10px">
-      <input v-model="name" placeholder="Display name" required />
-      <input v-model="email" type="email" placeholder="Email" required />
-      <input v-model="password" type="password" placeholder="Password (min 8 chars)" required minlength="8" />
-      <button type="submit">Register</button>
-    </form>
-    <p v-if="err" style="color: red">{{ err }}</p>
-    <p class="muted">Have an account? <router-link to="/login">Log in</router-link></p>
-  </div>
-</template>
diff --git a/frontend/src/views/Tasks.vue b/frontend/src/views/Tasks.vue
index 73af810..bbbd552 100644
--- a/frontend/src/views/Tasks.vue
+++ b/frontend/src/views/Tasks.vue
@@ -1,21 +1,27 @@
 <script setup>
-import { computed, onMounted, ref } from 'vue';
+import { computed, onMounted, ref, watch } from 'vue';
 import { useRouter } from 'vue-router';
 import api from '../api';
 import { useWorkspaceStore } from '../stores/workspace';
 import { useLocaleStore } from '../stores/locale';
 import Sidebar from '../components/Sidebar.vue';
+import Avatar from '../components/Avatar.vue';
 
 const ws = useWorkspaceStore();
 const L = useLocaleStore();
 const router = useRouter();
 
 const tasks = ref([]);
+const teams = ref([]);
+const members = ref([]);
+const teamFilter = ref('');
 const title = ref('');
 const due = ref('');
 const priority = ref('normal');
 const bookId = ref('');
 const pageId = ref('');
+const teamId = ref('');
+const assigneeId = ref('');
 
 const cols = computed(() => ({
   todo: tasks.value.filter((t) => t.status === 'todo'),
@@ -32,10 +38,19 @@ function fmtDate(d) {
 
 async function load() {
   if (!ws.currentId) return;
-  const { data } = await api.get(`/tasks/by-workspace/${ws.currentId}`);
+  const params = {};
+  if (teamFilter.value) params.team_id = teamFilter.value;
+  const { data } = await api.get(`/tasks/by-workspace/${ws.currentId}`, { params });
   tasks.value = data.tasks;
 }
 
+async function loadMeta() {
+  const { data } = await api.get(`/teams/by-workspace/${ws.currentId}`);
+  teams.value = data.teams;
+  const m = await api.get(`/workspaces/${ws.currentId}/members`);
+  members.value = m.data.members;
+}
+
 async function create() {
   if (!title.value.trim()) return;
   const { data } = await api.post('/tasks', {
@@ -45,12 +60,16 @@ async function create() {
     due_at: due.value || null,
     book_id: bookId.value || null,
     page_id: pageId.value || null,
+    team_id: teamId.value || null,
+    assignee_id: assigneeId.value || null,
   });
   tasks.value.unshift(data.task);
   title.value = '';
   due.value = '';
   bookId.value = '';
   pageId.value = '';
+  teamId.value = '';
+  assigneeId.value = '';
 }
 
 async function setStatus(t, status) {
@@ -58,16 +77,27 @@ async function setStatus(t, status) {
   Object.assign(t, data.task);
 }
 
+async function assign(t, userId) {
+  const { data } = await api.patch(`/tasks/${t.id}`, { assignee_id: userId || null });
+  Object.assign(t, data.task);
+  const m = members.value.find((x) => x.id === data.task.assignee_id);
+  t.assignee_name = m?.name || null;
+  t.assignee_avatar = m?.avatar || null;
+}
+
 async function remove(t) {
   if (!confirm('🗑️?')) return;
   await api.delete(`/tasks/${t.id}`);
   tasks.value = tasks.value.filter((x) => x.id !== t.id);
 }
 
+watch(teamFilter, load);
+
 onMounted(async () => {
   if (!ws.workspaces.length) await ws.fetchWorkspaces();
   await ws.fetchBooks();
   await ws.fetchPages();
+  await loadMeta();
   await load();
 });
 </script>
@@ -77,6 +107,16 @@ onMounted(async () => {
     <Sidebar />
     <main class="main">
       <h2>✅ {{ L.t('task.title') }}</h2>
+      <div class="row wrap team-tabs">
+        <button :class="{ ghost: teamFilter !== '' }" @click="teamFilter = ''">🌐 {{ L.t('task.allTeams') }}</button>
+        <button
+          v-for="tm in teams" :key="tm.id"
+          :class="{ ghost: teamFilter !== tm.id }"
+          @click="teamFilter = tm.id"
+        >
+          {{ tm.icon }} {{ tm.name }}
+        </button>
+      </div>
       <div class="card new-task">
         <div class="row wrap">
           <input v-model="title" :placeholder="L.t('task.ph')" @keyup.enter="create" style="flex: 2" />
@@ -96,6 +136,14 @@ onMounted(async () => {
             <option value="">{{ L.t('task.page') }}: {{ L.t('task.none') }}</option>
             <option v-for="p in ws.pages" :key="p.id" :value="p.id">{{ p.title }}</option>
           </select>
+          <select v-model="teamId">
+            <option value="">{{ L.t('task.team') }}: {{ L.t('task.none') }}</option>
+            <option v-for="tm in teams" :key="tm.id" :value="tm.id">{{ tm.icon }} {{ tm.name }}</option>
+          </select>
+          <select v-model="assigneeId">
+            <option value="">{{ L.t('task.assignee') }}: {{ L.t('task.none') }}</option>
+            <option v-for="m in members" :key="m.id" :value="m.id">{{ m.name }}</option>
+          </select>
           <button @click="create">＋ {{ L.t('task.new') }}</button>
         </div>
       </div>
@@ -112,6 +160,14 @@ onMounted(async () => {
             <div class="muted">
               <span v-if="t.book_title">📚 {{ t.book_title }}</span>
               <span v-if="t.page_title" class="link" @click="router.push(`/page/${t.page_id}`)">📄 {{ t.page_title }}</span>
+              <span v-if="t.team_name" class="pill">👥 {{ t.team_name }}</span>
+            </div>
+            <div class="row wrap">
+              <Avatar v-if="t.assignee_name" :name="t.assignee_name" :avatar="t.assignee_avatar" :size="22" />
+              <select :value="t.assignee_id || ''" @change="assign(t, $event.target.value)" style="max-width: 150px">
+                <option value="">{{ L.t('task.assignee') }}</option>
+                <option v-for="m in members" :key="m.id" :value="m.id">{{ m.name }}</option>
+              </select>
             </div>
             <div class="row wrap">
               <button v-if="t.status !== 'todo'" class="ghost mini" @click="setStatus(t, 'todo')">{{ L.t('task.toTodo') }}</button>