diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 1c821a0..218b395 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -62,10 +62,19 @@
       </div>
       <div class="scroll">
         <div v-if="loading.users" class="muted">Cargando usuarios…</div>
-        <div v-else class="grid">
-          <UserCard v-for="u in filteredUsers" :key="u.username" :item="u" :mode="layoutMode"
-            @toggleDisable="toggleDisable" @remove="removeUser" @edit="openEditUser" />
-        </div>
+        <template v-else>
+          <div v-if="layoutMode==='user'" class="grid">
+            <UserCard v-for="u in filteredUsers" :key="u.username" :item="u" :devicesById="devicesById"
+              :expanded="!!userExpanded[u.username]"
+              @toggle-expand="userExpanded[u.username] = !userExpanded[u.username]"
+              @toggleDisable="toggleDisable" @remove="removeUser" @edit="openEditUser" />
+          </div>
+          <div v-else class="grid">
+            <DispositivoCard v-for="d in devices" :key="d.id" :device="d" :users="usersForDevice(d.id)" :devicesById="devicesById"
+              :expanded="!!deviceExpanded[d.id]"
+              @toggle-expand="deviceExpanded[d.id] = !deviceExpanded[d.id]" />
+          </div>
+        </template>
       </div>
     </main>
   </section>
@@ -111,9 +120,10 @@
 </template>
 
 <script setup>
-import { onMounted, reactive, ref, computed } from 'vue';
+import { onMounted, reactive, ref, computed, watch } from 'vue';
 import EventCard from './components/EventCard.js';
-import UserCard from './components/UserCard.js';
+import UserCard from './components/UserCard.vue';
+import DispositivoCard from './components/DispositivoCard.vue';
 import Modal from './components/Modal.vue';
 import UserForm from './components/UserForm.vue';
 import RawDbViewer from './components/RawDbViewer.vue';
@@ -122,6 +132,9 @@ import VlanForm from './components/VlanForm.vue';
 const users = ref([]);
 const requests = ref([]);
 const loading = reactive({ users: false, requests: false });
+const devices = ref([]);
+const userExpanded = reactive({});
+const deviceExpanded = reactive({});
 // formulario inline removido: se usa modal con UserForm
 
 const showEventFilters = ref(false);
@@ -153,6 +166,14 @@ async function fetchRequests() {
   } finally { loading.requests = false; }
 }
 
+async function fetchDevices() {
+  try {
+    const res = await fetch('/api/devices');
+    const data = await res.json();
+    devices.value = data.items || [];
+  } catch {}
+}
+
 async function toggleDisable(u) {
   await fetch(`/api/users/${encodeURIComponent(u.username)}`, {
     method: 'PATCH',
@@ -181,17 +202,39 @@ async function selfTest() {
 
 function setupSse() {
   const ev = new EventSource('/api/events');
+  let refreshTimer = null;
+  function scheduleRefresh() {
+    if (refreshTimer) clearTimeout(refreshTimer);
+    refreshTimer = setTimeout(async () => {
+      await Promise.all([fetchUsers(), fetchDevices()]);
+      refreshTimer = null;
+    }, 1000);
+  }
   ev.addEventListener('message', (e) => {
     try {
       const data = JSON.parse(e.data);
       if (data && data.ts) requests.value.push(data);
+      const t = data && data.type;
+      if (t === 'authorize' || t === 'post-auth' || t === 'accounting' || t === 'coa-disconnect') {
+        scheduleRefresh();
+      }
     } catch {}
   });
   ev.addEventListener('clear', () => { requests.value = []; });
 }
 
 onMounted(async () => {
+  // Load persisted expand state
+  try {
+    const ue = JSON.parse(localStorage.getItem('ui_userExpanded') || '{}');
+    Object.assign(userExpanded, ue && typeof ue === 'object' ? ue : {});
+  } catch {}
+  try {
+    const de = JSON.parse(localStorage.getItem('ui_deviceExpanded') || '{}');
+    Object.assign(deviceExpanded, de && typeof de === 'object' ? de : {});
+  } catch {}
   await fetchUsers();
+  await fetchDevices();
   await fetchRequests();
   setupSse();
   applyTheme();
@@ -218,6 +261,24 @@ const filteredUsers = computed(() => {
   });
 });
 
+const devicesById = computed(() => {
+  const m = {};
+  for (const d of devices.value) m[d.id] = d;
+  return m;
+});
+
+function usersForDevice(id) {
+  return users.value.filter(u => Array.isArray(u.dispositivos_utilizados) && u.dispositivos_utilizados.includes(id));
+}
+
+// Persist expansion state
+watch(userExpanded, (v) => {
+  try { localStorage.setItem('ui_userExpanded', JSON.stringify(v)); } catch {}
+}, { deep: true });
+watch(deviceExpanded, (v) => {
+  try { localStorage.setItem('ui_deviceExpanded', JSON.stringify(v)); } catch {}
+}, { deep: true });
+
 function copyRequests() {
   const txt = JSON.stringify(requests.value, null, 2);
   navigator.clipboard?.writeText(txt);
diff --git a/frontend/src/components/DispositivoCard.vue b/frontend/src/components/DispositivoCard.vue
new file mode 100644
index 0000000..8a68622
--- /dev/null
+++ b/frontend/src/components/DispositivoCard.vue
@@ -0,0 +1,35 @@
+<template>
+  <div class="card">
+    <div class="row">
+      <b>{{ device.nombre || device.mac }}</b>
+      <span class="chip">{{ device.mac }}</span>
+      <span v-if="connectedCount>0 || connected" class="chip" style="background: rgba(255,127,187,.2); border-color: rgba(255,127,187,.5);">Conectado</span>
+      <span class="spacer"></span>
+      <button v-if="!simple" class="icon-btn" @click="$emit('toggleExpand')">{{ expanded ? 'Contraer' : 'Expandir' }}</button>
+    </div>
+    <div v-if="expanded && users && users.length" style="margin-top:8px;">
+      <div class="grid">
+        <UserCard v-for="u in users" :key="u.username" :item="u" :devicesById="devicesById" :expandable="false" />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue';
+import UserCard from './UserCard.vue';
+
+const props = defineProps({
+  device: { type: Object, required: true },
+  users: { type: Array, default: () => [] },
+  devicesById: { type: Object, default: () => ({}) },
+  simple: { type: Boolean, default: false },
+  connected: { type: Boolean, default: false },
+  expanded: { type: Boolean, default: false }
+});
+const connectedCount = computed(() => {
+  if (!props.users || !props.users.length) return props.connected ? 1 : 0;
+  const id = props.device.id;
+  return props.users.filter(u => Array.isArray(u.dispositivos_conectados) && u.dispositivos_conectados.includes(id)).length;
+});
+</script>
diff --git a/frontend/src/components/UserCard.js b/frontend/src/components/UserCard.js
deleted file mode 100644
index baf6c99..0000000
--- a/frontend/src/components/UserCard.js
+++ /dev/null
@@ -1,26 +0,0 @@
-import { defineComponent, h } from 'vue';
-import htm from 'htm';
-const html = htm.bind(h);
-
-export default defineComponent({
-  name: 'UserCard',
-  props: { item: { type: Object, required: true }, mode: { type: String, default: 'user' } },
-  emits: ['toggleDisable', 'remove', 'edit'],
-  setup(props, { emit }) {
-    function toggle() { emit('toggleDisable', props.item); }
-    function remove() { emit('remove', props.item); }
-    function edit() { emit('edit', props.item); }
-    return () => html`<div class="card">
-      <div class="row">
-        <b>${props.mode === 'user' ? props.item.username : (props.item.device || props.item.username)}</b>
-        <span class="chip">VLAN ${props.item.vlan}</span>
-        ${props.item.disabled ? html`<span class="chip" style="color:#b33">deshabilitado</span>` : html`<span class="chip">activo</span>`}
-        <span class="spacer"></span>
-        <button class="icon-btn" onClick=${edit}>Editar</button>
-        <button class="icon-btn" onClick=${toggle}>${props.item.disabled ? 'Habilitar' : 'Deshabilitar'}</button>
-        <button class="icon-btn" onClick=${remove}>Eliminar</button>
-      </div>
-      <div class="muted" style="margin-top:6px; font-size:12px;">${props.item.devices ? props.item.devices.length : 0} dispositivos</div>
-    </div>`;
-  }
-});
diff --git a/frontend/src/components/UserCard.vue b/frontend/src/components/UserCard.vue
new file mode 100644
index 0000000..4e6ee84
--- /dev/null
+++ b/frontend/src/components/UserCard.vue
@@ -0,0 +1,40 @@
+<template>
+  <div class="card">
+    <div class="row">
+      <b>{{ item.username }}</b>
+      <span class="chip">VLAN {{ item.vlan }}</span>
+      <span class="chip" :style="item.disabled ? 'color:#b33' : ''">{{ item.disabled ? 'deshabilitado' : 'activo' }}</span>
+      <span class="spacer"></span>
+      <button class="icon-btn" @click="$emit('edit', item)">Editar</button>
+      <button class="icon-btn" @click="$emit('toggleDisable', item)">{{ item.disabled ? 'Habilitar' : 'Deshabilitar' }}</button>
+      <button class="icon-btn" @click="$emit('remove', item)">Eliminar</button>
+      <button v-if="expandable" class="icon-btn" @click="$emit('toggleExpand')">{{ expanded ? 'Contraer' : 'Expandir' }}</button>
+    </div>
+    <div v-if="expanded && deviceList.length" style="margin-top:8px;">
+      <div class="grid">
+        <DispositivoCard v-for="d in deviceList" :key="d.id" :device="d" :connected="isConnected(d.id)" simple />
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue';
+import DispositivoCard from './DispositivoCard.vue';
+
+const props = defineProps({
+  item: { type: Object, required: true },
+  devicesById: { type: Object, default: () => ({}) },
+  expandable: { type: Boolean, default: true },
+  expanded: { type: Boolean, default: false }
+});
+
+const deviceList = computed(() => {
+  const ids = props.item.dispositivos_utilizados || [];
+  return ids.map(id => props.devicesById[id]).filter(Boolean);
+});
+
+function isConnected(id) {
+  return Array.isArray(props.item.dispositivos_conectados) && props.item.dispositivos_conectados.includes(id);
+}
+</script>
diff --git a/node-api/src/routes/api.js b/node-api/src/routes/api.js
index 6d9c95d..5e958ed 100644
--- a/node-api/src/routes/api.js
+++ b/node-api/src/routes/api.js
@@ -151,4 +151,15 @@ router.post('/vlans', async (req, res) => {
   }
 });
 
+// Devices list (read-only)
+router.get('/devices', async (_req, res) => {
+  try {
+    const result = await pool.query('SELECT id, mac, nombre, vendor, descripcion, first_seen, last_seen FROM dispositivos ORDER BY last_seen DESC NULLS LAST, first_seen DESC');
+    res.json({ items: result.rows });
+  } catch (e) {
+    console.error('GET /api/devices error:', e?.message || e);
+    res.status(500).json({ ok: false, error: 'db_error', items: [] });
+  }
+});
+
 export default router;