diff --git a/.gitignore b/.gitignore
index d17aa93..3fcbcf1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 .env
 backend/data/
+frontend/node_modules/
+frontend/dist/
+frontend/package-lock.json
diff --git a/frontend/src/api/client.js b/frontend/src/api/client.js
index a7bb06d..774d00a 100644
--- a/frontend/src/api/client.js
+++ b/frontend/src/api/client.js
@@ -1,10 +1,37 @@
 /**
  * API client using native Fetch API.
  * All requests go to /api (proxied to backend by Vite in dev, or nginx in prod).
+ *
+ * Phase 2 additions (D-11):
+ *   - Injects Authorization: Bearer header from useAuthStore().accessToken
+ *   - On 401: calls authStore.refresh() and retries once (_retry guard)
+ *   - On refresh failure: clears accessToken, throws 'Session expired'
  */
 
 async function request(path, options = {}) {
-  const res = await fetch(path, options)
+  // Lazy import to avoid circular dependency (stores/auth.js → api/client.js → stores/auth.js)
+  const { useAuthStore } = await import('../stores/auth.js')
+  const authStore = useAuthStore()
+
+  const headers = { ...(options.headers || {}) }
+  if (authStore.accessToken) {
+    headers['Authorization'] = `Bearer ${authStore.accessToken}`
+  }
+
+  const res = await fetch(path, { ...options, headers, credentials: 'include' })
+
+  // 401 → attempt refresh → retry once
+  if (res.status === 401 && !options._retry) {
+    try {
+      await authStore.refresh()
+      return request(path, { ...options, _retry: true })
+    } catch {
+      authStore.accessToken = null
+      authStore.user = null
+      throw new Error('Session expired')
+    }
+  }
+
   if (!res.ok) {
     let msg = `HTTP ${res.status}`
     try { msg = (await res.json()).detail || msg } catch {}
@@ -103,3 +130,124 @@ export function testProvider(provider) {
 export function getDefaultPrompt() {
   return request('/api/settings/default-prompt')
 }
+
+// ── Auth ─────────────────────────────────────────────────────────────────────
+
+export function login(body) {
+  return request('/api/auth/login', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  })
+}
+
+export function register(body) {
+  return request('/api/auth/register', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  })
+}
+
+export function refreshToken() {
+  // No body — httpOnly cookie sent automatically via credentials: 'include'
+  return request('/api/auth/refresh', { method: 'POST' })
+}
+
+export function logout() {
+  return request('/api/auth/logout', { method: 'POST' })
+}
+
+export function logoutAll() {
+  return request('/api/auth/logout-all', { method: 'POST' })
+}
+
+export function getMe() {
+  return request('/api/auth/me')
+}
+
+export function changePassword(body) {
+  return request('/api/auth/change-password', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  })
+}
+
+// ── TOTP ──────────────────────────────────────────────────────────────────────
+
+export function totpSetup() {
+  return request('/api/auth/totp/setup')
+}
+
+export function totpEnable(code) {
+  return request('/api/auth/totp/enable', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ code }),
+  })
+}
+
+export function totpDisable() {
+  return request('/api/auth/totp', { method: 'DELETE' })
+}
+
+// ── Password reset ────────────────────────────────────────────────────────────
+
+export function passwordResetRequest(email) {
+  return request('/api/auth/password-reset', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ email }),
+  })
+}
+
+export function passwordResetConfirm(token, newPassword) {
+  return request('/api/auth/password-reset/confirm', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ token, new_password: newPassword }),
+  })
+}
+
+// ── Admin ─────────────────────────────────────────────────────────────────────
+
+export function adminListUsers() {
+  return request('/api/admin/users')
+}
+
+export function adminCreateUser(body) {
+  return request('/api/admin/users', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(body),
+  })
+}
+
+export function adminDeactivateUser(id) {
+  return request(`/api/admin/users/${id}/deactivate`, { method: 'POST' })
+}
+
+export function adminReactivateUser(id) {
+  return request(`/api/admin/users/${id}/reactivate`, { method: 'POST' })
+}
+
+export function adminResetUserPassword(id) {
+  return request(`/api/admin/users/${id}/reset-password`, { method: 'POST' })
+}
+
+export function adminUpdateQuota(id, limitBytes) {
+  return request(`/api/admin/users/${id}/quota`, {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ limit_bytes: limitBytes }),
+  })
+}
+
+export function adminUpdateAiConfig(id, provider, model) {
+  return request(`/api/admin/users/${id}/ai-config`, {
+    method: 'PATCH',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ provider, model }),
+  })
+}
diff --git a/frontend/src/components/auth/PasswordStrengthBar.vue b/frontend/src/components/auth/PasswordStrengthBar.vue
new file mode 100644
index 0000000..2d9e560
--- /dev/null
+++ b/frontend/src/components/auth/PasswordStrengthBar.vue
@@ -0,0 +1,68 @@
+<template>
+  <div v-if="password" class="mt-2 space-y-1">
+    <!-- Strength bar: 4 segments -->
+    <div class="flex gap-1">
+      <div
+        v-for="i in 4"
+        :key="i"
+        class="h-1 flex-1 rounded transition-colors duration-200"
+        :class="i <= strength ? segmentColor : 'bg-gray-200'"
+      />
+    </div>
+    <!-- Label -->
+    <div class="flex justify-end">
+      <span class="text-xs font-semibold" :class="labelColor">{{ label }}</span>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue'
+
+const props = defineProps({
+  password: {
+    type: String,
+    default: '',
+  },
+})
+
+/**
+ * Strength score 0–4:
+ *   +1 if length >= 12
+ *   +1 if contains uppercase
+ *   +1 if contains digit
+ *   +1 if contains special character
+ * Matches backend AUTH-01 rules.
+ */
+const strength = computed(() => {
+  const p = props.password
+  if (!p) return 0
+  let score = 0
+  if (p.length >= 12) score++
+  if (/[A-Z]/.test(p)) score++
+  if (/[0-9]/.test(p)) score++
+  if (/[^A-Za-z0-9]/.test(p)) score++
+  return score
+})
+
+const segmentColor = computed(() => {
+  if (strength.value === 1) return 'bg-red-500'
+  if (strength.value === 2) return 'bg-amber-500'
+  if (strength.value === 3) return 'bg-amber-400'
+  return 'bg-green-500'
+})
+
+const labelColor = computed(() => {
+  if (strength.value === 1) return 'text-red-500'
+  if (strength.value === 2) return 'text-amber-500'
+  if (strength.value === 3) return 'text-amber-400'
+  return 'text-green-500'
+})
+
+const label = computed(() => {
+  if (strength.value === 1) return 'Too weak'
+  if (strength.value === 2) return 'Weak'
+  if (strength.value === 3) return 'Fair'
+  return 'Strong'
+})
+</script>
diff --git a/frontend/src/components/ui/AppSpinner.vue b/frontend/src/components/ui/AppSpinner.vue
new file mode 100644
index 0000000..d24924c
--- /dev/null
+++ b/frontend/src/components/ui/AppSpinner.vue
@@ -0,0 +1,23 @@
+<template>
+  <svg
+    class="animate-spin h-4 w-4"
+    xmlns="http://www.w3.org/2000/svg"
+    fill="none"
+    viewBox="0 0 24 24"
+    aria-hidden="true"
+  >
+    <circle
+      class="opacity-25"
+      cx="12"
+      cy="12"
+      r="10"
+      stroke="currentColor"
+      stroke-width="4"
+    />
+    <path
+      class="opacity-75"
+      fill="currentColor"
+      d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"
+    />
+  </svg>
+</template>
diff --git a/frontend/src/layouts/AuthLayout.vue b/frontend/src/layouts/AuthLayout.vue
new file mode 100644
index 0000000..bb2739b
--- /dev/null
+++ b/frontend/src/layouts/AuthLayout.vue
@@ -0,0 +1,12 @@
+<template>
+  <div class="min-h-screen bg-gray-50 flex items-center justify-center">
+    <div class="w-full max-w-sm">
+      <!-- Brand logo -->
+      <div class="text-center mb-6">
+        <h1 class="text-xl font-semibold text-indigo-600 tracking-tight">DocuVault</h1>
+      </div>
+      <!-- Auth card content -->
+      <router-view />
+    </div>
+  </div>
+</template>
diff --git a/frontend/src/router/index.js b/frontend/src/router/index.js
index ece1f8d..ce5b038 100644
--- a/frontend/src/router/index.js
+++ b/frontend/src/router/index.js
@@ -1,18 +1,57 @@
 import { createRouter, createWebHistory } from 'vue-router'
+import { useAuthStore } from '../stores/auth.js'
 import HomeView from '../views/HomeView.vue'
 import TopicsView from '../views/TopicsView.vue'
 import DocumentView from '../views/DocumentView.vue'
 import SettingsView from '../views/SettingsView.vue'
 
 const routes = [
+  // Existing routes
   { path: '/', component: HomeView },
   { path: '/topics', component: TopicsView },
   { path: '/topics/:name', component: TopicsView },
   { path: '/document/:id', component: DocumentView },
   { path: '/settings', component: SettingsView },
+
+  // Phase 2 — public auth routes (no guard)
+  {
+    path: '/login',
+    component: () => import('../views/auth/LoginView.vue'),
+    meta: { public: true },
+  },
+  {
+    path: '/register',
+    component: () => import('../views/auth/RegisterView.vue'),
+    meta: { public: true },
+  },
+  {
+    path: '/password-reset',
+    component: () => import('../views/auth/PasswordResetView.vue'),
+    meta: { public: true },
+  },
+  {
+    path: '/password-reset/confirm',
+    component: () => import('../views/auth/NewPasswordView.vue'),
+    meta: { public: true },
+  },
+
+  // Phase 2 — authenticated routes
+  { path: '/account', component: () => import('../views/AccountView.vue') },
+  { path: '/admin', component: () => import('../views/AdminView.vue') },
 ]
 
-export default createRouter({
+const router = createRouter({
   history: createWebHistory(),
   routes,
 })
+
+// Navigation guard (D-10): redirect unauthenticated users to /login.
+// Preserves the intended destination via ?redirect= query param.
+router.beforeEach((to) => {
+  const authStore = useAuthStore()
+  if (!to.meta.public && !authStore.accessToken) {
+    return { path: '/login', query: { redirect: to.fullPath } }
+  }
+})
+
+export default router
diff --git a/frontend/src/stores/auth.js b/frontend/src/stores/auth.js
new file mode 100644
index 0000000..d01133c
--- /dev/null
+++ b/frontend/src/stores/auth.js
@@ -0,0 +1,136 @@
+/**
+ * useAuthStore — Pinia auth store for DocuVault.
+ *
+ * Security invariants (CLAUDE.md):
+ *   - accessToken lives ONLY in ref() memory — never written to browser storage
+ *   - Refresh token is an httpOnly cookie managed by the backend
+ *   - On 401: api/client.js calls authStore.refresh() (uses httpOnly cookie)
+ *
+ * State:
+ *   accessToken  ref(null) — JWT access token, memory only
+ *   user         ref(null) — { id, handle, email, role, totp_enabled }
+ *   loading      ref(false)
+ *   error        ref(null)
+ */
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import * as api from '../api/client.js'
+
+export const useAuthStore = defineStore('auth', () => {
+  // State — accessToken in memory only (CLAUDE.md rule: no browser storage writes)
+  const accessToken = ref(null)
+  const user = ref(null)
+  const loading = ref(false)
+  const error = ref(null)
+
+  /**
+   * Register a new account.
+   * Does NOT auto-login — caller should redirect to /login after success.
+   */
+  async function register(handle, email, password) {
+    loading.value = true
+    error.value = null
+    try {
+      const data = await api.register({ handle, email, password })
+      return data
+    } catch (e) {
+      error.value = e.message
+      throw e
+    } finally {
+      loading.value = false
+    }
+  }
+
+  /**
+   * Login with email + password, optionally with TOTP or backup code.
+   *
+   * options:
+   *   { totpCode?: string, backupCode?: string }
+   *
+   * Return values:
+   *   { requires_totp: true }            — TOTP challenge (no tokens issued)
+   *   { requires_password_change: true, user_id: string } — must change pw first
+   *   undefined                          — full success (accessToken + user set)
+   */
+  async function login(email, password, options = {}) {
+    loading.value = true
+    error.value = null
+    try {
+      const data = await api.login({
+        email,
+        password,
+        totp_code: options.totpCode ?? null,
+        backup_code: options.backupCode ?? null,
+      })
+
+      if (data.requires_totp) {
+        return { requires_totp: true }
+      }
+
+      if (data.requires_password_change) {
+        return { requires_password_change: true, user_id: data.user_id }
+      }
+
+      // Full login success
+      accessToken.value = data.access_token
+      user.value = data.user
+    } catch (e) {
+      error.value = e.message
+      throw e
+    } finally {
+      loading.value = false
+    }
+  }
+
+  /**
+   * Refresh the access token using the httpOnly refresh cookie.
+   * Called automatically by api/client.js on 401.
+   * Throws on failure (session expired — caller should redirect to /login).
+   */
+  async function refresh() {
+    const data = await api.refreshToken()
+    accessToken.value = data.access_token
+    user.value = data.user
+  }
+
+  /**
+   * Logout: revoke the current refresh token and clear local state.
+   * Always clears accessToken + user, even if the API call fails.
+   */
+  async function logout() {
+    try {
+      await api.logout()
+    } catch {
+      // Ignore errors — clear state regardless
+    } finally {
+      accessToken.value = null
+      user.value = null
+    }
+  }
+
+  /**
+   * Sign out of all devices: revoke ALL refresh tokens for the current user.
+   */
+  async function logoutAll() {
+    try {
+      await api.logoutAll()
+    } catch {
+      // Ignore errors
+    } finally {
+      accessToken.value = null
+      user.value = null
+    }
+  }
+
+  return {
+    accessToken,
+    user,
+    loading,
+    error,
+    register,
+    login,
+    logout,
+    logoutAll,
+    refresh,
+  }
+})
diff --git a/frontend/src/views/AccountView.vue b/frontend/src/views/AccountView.vue
new file mode 100644
index 0000000..53e059f
--- /dev/null
+++ b/frontend/src/views/AccountView.vue
@@ -0,0 +1,153 @@
+<template>
+  <div class="p-8 max-w-2xl mx-auto">
+    <h2 class="text-2xl font-semibold text-gray-900 mb-6">Account settings</h2>
+
+    <div class="space-y-6">
+      <!-- Account information -->
+      <section class="bg-white border border-gray-200 rounded-xl p-6">
+        <h3 class="font-semibold text-gray-800 mb-4">Account information</h3>
+        <div class="space-y-2 text-sm text-gray-700">
+          <div><span class="text-gray-500">Email:</span> {{ authStore.user?.email }}</div>
+          <div class="flex items-center gap-2">
+            <span class="text-gray-500">Role:</span>
+            <span
+              class="inline-flex items-center px-2 py-1 rounded text-xs font-semibold"
+              :class="authStore.user?.role === 'admin'
+                ? 'bg-indigo-100 text-indigo-700'
+                : 'bg-gray-100 text-gray-600'"
+            >
+              {{ authStore.user?.role }}
+            </span>
+          </div>
+        </div>
+      </section>
+
+      <!-- Change password -->
+      <section class="bg-white border border-gray-200 rounded-xl p-6">
+        <h3 class="font-semibold text-gray-800 mb-4">Change password</h3>
+
+        <form @submit.prevent="changePassword" class="space-y-4 max-w-sm">
+          <div>
+            <label class="block text-sm font-semibold text-gray-700 mb-1">Current password</label>
+            <input
+              v-model="currentPassword"
+              type="password"
+              required
+              class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+            />
+          </div>
+          <div>
+            <label class="block text-sm font-semibold text-gray-700 mb-1">New password</label>
+            <input
+              v-model="newPassword"
+              type="password"
+              required
+              class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+            />
+            <PasswordStrengthBar :password="newPassword" />
+          </div>
+
+          <div v-if="passwordError" class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700">
+            {{ passwordError }}
+          </div>
+          <div v-if="passwordSuccess" class="text-sm text-green-600">{{ passwordSuccess }}</div>
+
+          <button
+            type="submit"
+            :disabled="changingPassword"
+            class="flex items-center gap-2 px-6 py-2.5 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75"
+          >
+            <AppSpinner v-if="changingPassword" />
+            {{ changingPassword ? 'Updating…' : 'Update password' }}
+          </button>
+        </form>
+      </section>
+
+      <!-- Sessions -->
+      <section class="bg-white border border-gray-200 rounded-xl p-6">
+        <h3 class="font-semibold text-gray-800 mb-4">Sessions</h3>
+
+        <template v-if="!confirmSignOutAll">
+          <button
+            @click="confirmSignOutAll = true"
+            class="text-sm px-4 py-2 border border-red-300 text-red-600 rounded-lg hover:bg-red-50 transition-colors"
+          >
+            Sign out all devices
+          </button>
+        </template>
+
+        <template v-else>
+          <p class="text-sm text-gray-700 mb-3">
+            This will sign you out of all devices, including this one. You will need to sign in again.
+          </p>
+          <div class="flex gap-3">
+            <button
+              @click="confirmSignOutAll = false"
+              class="text-sm text-gray-600 hover:text-gray-800"
+            >
+              Keep signed in
+            </button>
+            <button
+              @click="signOutAll"
+              :disabled="signingOutAll"
+              class="flex items-center gap-2 px-4 py-2 bg-red-600 hover:bg-red-700 text-white text-sm font-semibold rounded-lg disabled:opacity-75"
+            >
+              <AppSpinner v-if="signingOutAll" />
+              Sign out all devices
+            </button>
+          </div>
+        </template>
+      </section>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAuthStore } from '../stores/auth.js'
+import * as api from '../api/client.js'
+import PasswordStrengthBar from '../components/auth/PasswordStrengthBar.vue'
+import AppSpinner from '../components/ui/AppSpinner.vue'
+
+const authStore = useAuthStore()
+const router = useRouter()
+
+const currentPassword = ref('')
+const newPassword = ref('')
+const changingPassword = ref(false)
+const passwordError = ref(null)
+const passwordSuccess = ref(null)
+
+const confirmSignOutAll = ref(false)
+const signingOutAll = ref(false)
+
+async function changePassword() {
+  changingPassword.value = true
+  passwordError.value = null
+  passwordSuccess.value = null
+  try {
+    await api.changePassword({
+      current_password: currentPassword.value,
+      new_password: newPassword.value,
+    })
+    passwordSuccess.value = 'Password updated.'
+    currentPassword.value = ''
+    newPassword.value = ''
+  } catch (e) {
+    passwordError.value = e.message
+  } finally {
+    changingPassword.value = false
+  }
+}
+
+async function signOutAll() {
+  signingOutAll.value = true
+  try {
+    await authStore.logoutAll()
+    await router.push('/login')
+  } finally {
+    signingOutAll.value = false
+  }
+}
+</script>
diff --git a/frontend/src/views/AdminView.vue b/frontend/src/views/AdminView.vue
new file mode 100644
index 0000000..0ddcc53
--- /dev/null
+++ b/frontend/src/views/AdminView.vue
@@ -0,0 +1,39 @@
+<template>
+  <div class="p-8 max-w-4xl mx-auto">
+    <h2 class="text-2xl font-semibold text-gray-900 mb-4">Admin panel</h2>
+
+    <!-- Sub-navigation -->
+    <div class="flex border-b border-gray-200 mb-6">
+      <button
+        v-for="tab in tabs"
+        :key="tab.id"
+        @click="activeTab = tab.id"
+        class="px-4 py-2 text-sm font-semibold border-b-2 transition-colors"
+        :class="activeTab === tab.id
+          ? 'text-indigo-600 border-indigo-600'
+          : 'text-gray-500 hover:text-gray-700 border-transparent'"
+      >
+        {{ tab.label }}
+      </button>
+    </div>
+
+    <!-- Tab content (stub — wired in Phase 2 admin plan) -->
+    <div class="text-sm text-gray-500">
+      {{ activeTab === 'users' ? 'User management coming soon.' :
+         activeTab === 'quotas' ? 'Quota management coming soon.' :
+         'AI config management coming soon.' }}
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+
+const tabs = [
+  { id: 'users', label: 'Users' },
+  { id: 'quotas', label: 'Quotas' },
+  { id: 'ai', label: 'AI Config' },
+]
+
+const activeTab = ref('users')
+</script>
diff --git a/frontend/src/views/auth/LoginView.vue b/frontend/src/views/auth/LoginView.vue
new file mode 100644
index 0000000..1a28b62
--- /dev/null
+++ b/frontend/src/views/auth/LoginView.vue
@@ -0,0 +1,266 @@
+<template>
+  <div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-8 w-full">
+    <!-- Step: password -->
+    <template v-if="step === 'password'">
+      <h2 class="text-2xl font-semibold text-gray-900 mb-6">Sign in to DocuVault</h2>
+
+      <form @submit.prevent="submitPassword" class="space-y-4">
+        <div>
+          <label class="block text-sm font-semibold text-gray-700 mb-1">Email</label>
+          <input
+            v-model="email"
+            type="email"
+            required
+            autocomplete="email"
+            class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+          />
+        </div>
+
+        <div>
+          <label class="block text-sm font-semibold text-gray-700 mb-1">Password</label>
+          <input
+            v-model="password"
+            type="password"
+            required
+            autocomplete="current-password"
+            class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+          />
+        </div>
+
+        <!-- Form-level error -->
+        <div
+          v-if="error"
+          class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700"
+        >
+          {{ error }}
+        </div>
+
+        <button
+          type="submit"
+          :disabled="loading"
+          class="w-full flex items-center justify-center gap-2 px-6 py-3 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75 min-h-[44px]"
+        >
+          <AppSpinner v-if="loading" />
+          {{ loading ? 'Signing in…' : 'Sign in' }}
+        </button>
+
+        <p class="text-center text-sm text-gray-500">
+          <router-link to="/password-reset" class="text-indigo-600 hover:underline">
+            Forgot your password?
+          </router-link>
+        </p>
+
+        <p class="text-center text-sm text-gray-500">
+          Don't have an account?
+          <router-link to="/register" class="text-indigo-600 hover:underline">
+            Create one
+          </router-link>
+        </p>
+      </form>
+    </template>
+
+    <!-- Step: TOTP -->
+    <template v-else-if="step === 'totp'">
+      <h2 class="text-2xl font-semibold text-gray-900 mb-1">Two-factor authentication</h2>
+      <p class="text-sm text-gray-500 mb-6">Enter the 6-digit code from your authenticator app.</p>
+
+      <form @submit.prevent="submitTotp" class="space-y-4">
+        <div class="flex justify-center">
+          <input
+            v-model="totpInput"
+            type="text"
+            inputmode="numeric"
+            maxlength="6"
+            autocomplete="one-time-code"
+            placeholder="000000"
+            class="block w-36 rounded-lg px-3 py-3 text-sm text-center border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+          />
+        </div>
+
+        <!-- Form-level error -->
+        <div
+          v-if="error"
+          class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700"
+        >
+          {{ error }}
+        </div>
+
+        <button
+          type="submit"
+          :disabled="loading"
+          class="w-full flex items-center justify-center gap-2 px-6 py-3 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75 min-h-[44px]"
+        >
+          <AppSpinner v-if="loading" />
+          {{ loading ? 'Verifying…' : 'Verify code' }}
+        </button>
+
+        <p class="text-center">
+          <button
+            type="button"
+            @click="step = 'backup'"
+            class="text-sm text-indigo-600 hover:underline"
+          >
+            Use a backup code instead
+          </button>
+        </p>
+
+        <p class="text-center">
+          <button
+            type="button"
+            @click="resetToPassword"
+            class="text-sm text-gray-500 hover:text-gray-700"
+          >
+            Back to sign in
+          </button>
+        </p>
+      </form>
+    </template>
+
+    <!-- Step: backup code -->
+    <template v-else-if="step === 'backup'">
+      <h2 class="text-2xl font-semibold text-gray-900 mb-1">Two-factor authentication</h2>
+      <p class="text-sm text-gray-500 mb-6">Enter a backup code.</p>
+
+      <form @submit.prevent="submitBackupCode" class="space-y-4">
+        <div>
+          <label class="block text-sm font-semibold text-gray-700 mb-1">Backup code</label>
+          <input
+            v-model="backupCodeInput"
+            type="text"
+            placeholder="XXXXXXXX"
+            autocomplete="off"
+            class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 font-mono transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+          />
+        </div>
+
+        <!-- Form-level error -->
+        <div
+          v-if="error"
+          class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700"
+        >
+          {{ error }}
+        </div>
+
+        <button
+          type="submit"
+          :disabled="loading"
+          class="w-full flex items-center justify-center gap-2 px-6 py-3 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75 min-h-[44px]"
+        >
+          <AppSpinner v-if="loading" />
+          {{ loading ? 'Verifying…' : 'Sign in with backup code' }}
+        </button>
+
+        <p class="text-center">
+          <button
+            type="button"
+            @click="step = 'totp'"
+            class="text-sm text-indigo-600 hover:underline"
+          >
+            Use authenticator app instead
+          </button>
+        </p>
+
+        <p class="text-center">
+          <button
+            type="button"
+            @click="resetToPassword"
+            class="text-sm text-gray-500 hover:text-gray-700"
+          >
+            Back to sign in
+          </button>
+        </p>
+      </form>
+    </template>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useRouter, useRoute } from 'vue-router'
+import { useAuthStore } from '../../stores/auth.js'
+import AppSpinner from '../../components/ui/AppSpinner.vue'
+
+const authStore = useAuthStore()
+const router = useRouter()
+const route = useRoute()
+
+// Form state
+const email = ref('')
+const password = ref('')
+const totpInput = ref('')
+const backupCodeInput = ref('')
+const loading = ref(false)
+const error = ref(null)
+
+// Step: 'password' | 'totp' | 'backup'
+const step = ref('password')
+
+function resetToPassword() {
+  step.value = 'password'
+  totpInput.value = ''
+  backupCodeInput.value = ''
+  error.value = null
+}
+
+async function handleLoginResult(result) {
+  if (!result) {
+    // Full success — tokens set in store
+    const redirect = route.query.redirect || '/'
+    await router.push(redirect)
+    return
+  }
+  if (result.requires_totp) {
+    error.value = null
+    step.value = 'totp'
+    return
+  }
+  if (result.requires_password_change) {
+    // User must change password before accessing the app
+    await router.push('/account')
+    return
+  }
+}
+
+async function submitPassword() {
+  loading.value = true
+  error.value = null
+  try {
+    const result = await authStore.login(email.value, password.value)
+    await handleLoginResult(result)
+  } catch (e) {
+    error.value = e.message
+  } finally {
+    loading.value = false
+  }
+}
+
+async function submitTotp() {
+  loading.value = true
+  error.value = null
+  try {
+    const result = await authStore.login(email.value, password.value, {
+      totpCode: totpInput.value,
+    })
+    await handleLoginResult(result)
+  } catch (e) {
+    error.value = e.message
+  } finally {
+    loading.value = false
+  }
+}
+
+async function submitBackupCode() {
+  loading.value = true
+  error.value = null
+  try {
+    const result = await authStore.login(email.value, password.value, {
+      backupCode: backupCodeInput.value,
+    })
+    await handleLoginResult(result)
+  } catch (e) {
+    error.value = e.message || 'Invalid or already used code'
+  } finally {
+    loading.value = false
+  }
+}
+</script>
diff --git a/frontend/src/views/auth/NewPasswordView.vue b/frontend/src/views/auth/NewPasswordView.vue
new file mode 100644
index 0000000..2ef1e17
--- /dev/null
+++ b/frontend/src/views/auth/NewPasswordView.vue
@@ -0,0 +1,70 @@
+<template>
+  <div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-8 w-full">
+    <h2 class="text-2xl font-semibold text-gray-900 mb-1">Set a new password</h2>
+    <p class="text-sm text-gray-500 mb-6">Choose a strong password for your account.</p>
+
+    <template v-if="!done">
+      <form @submit.prevent="submit" class="space-y-4">
+        <div>
+          <label class="block text-sm font-semibold text-gray-700 mb-1">New password</label>
+          <input
+            v-model="newPassword"
+            type="password"
+            required
+            autocomplete="new-password"
+            class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+          />
+          <PasswordStrengthBar :password="newPassword" />
+        </div>
+
+        <div v-if="error" class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700">
+          {{ error }}
+        </div>
+
+        <button
+          type="submit"
+          :disabled="loading"
+          class="w-full flex items-center justify-center gap-2 px-6 py-3 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75 min-h-[44px]"
+        >
+          <AppSpinner v-if="loading" />
+          {{ loading ? 'Setting password…' : 'Set password' }}
+        </button>
+      </form>
+    </template>
+
+    <template v-else>
+      <div class="p-4 bg-green-50 border border-green-200 text-sm text-green-800 rounded-lg mb-4">
+        Password updated. Please sign in.
+      </div>
+      <router-link to="/login" class="text-indigo-600 hover:underline text-sm">Sign in</router-link>
+    </template>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useRoute } from 'vue-router'
+import * as api from '../../api/client.js'
+import PasswordStrengthBar from '../../components/auth/PasswordStrengthBar.vue'
+import AppSpinner from '../../components/ui/AppSpinner.vue'
+
+const route = useRoute()
+const newPassword = ref('')
+const loading = ref(false)
+const error = ref(null)
+const done = ref(false)
+
+async function submit() {
+  loading.value = true
+  error.value = null
+  const token = route.query.token
+  try {
+    await api.passwordResetConfirm(token, newPassword.value)
+    done.value = true
+  } catch (e) {
+    error.value = e.message
+  } finally {
+    loading.value = false
+  }
+}
+</script>
diff --git a/frontend/src/views/auth/PasswordResetView.vue b/frontend/src/views/auth/PasswordResetView.vue
new file mode 100644
index 0000000..f64d519
--- /dev/null
+++ b/frontend/src/views/auth/PasswordResetView.vue
@@ -0,0 +1,72 @@
+<template>
+  <div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-8 w-full">
+    <h2 class="text-2xl font-semibold text-gray-900 mb-1">Reset your password</h2>
+    <p class="text-sm text-gray-500 mb-6">Enter your email and we'll send you a reset link.</p>
+
+    <template v-if="!sent">
+      <form @submit.prevent="submit" class="space-y-4">
+        <div>
+          <label class="block text-sm font-semibold text-gray-700 mb-1">Email</label>
+          <input
+            v-model="email"
+            type="email"
+            required
+            autocomplete="email"
+            class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+          />
+        </div>
+
+        <div v-if="error" class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700">
+          {{ error }}
+        </div>
+
+        <button
+          type="submit"
+          :disabled="loading"
+          class="w-full flex items-center justify-center gap-2 px-6 py-3 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75 min-h-[44px]"
+        >
+          <AppSpinner v-if="loading" />
+          {{ loading ? 'Sending…' : 'Send reset link' }}
+        </button>
+
+        <p class="text-center text-sm text-gray-500">
+          <router-link to="/login" class="text-indigo-600 hover:underline">Back to sign in</router-link>
+        </p>
+      </form>
+    </template>
+
+    <template v-else>
+      <div class="p-4 bg-green-50 border border-green-200 text-sm text-green-800 rounded-lg">
+        If an account exists for that email, you will receive a reset link shortly. Check your inbox.
+      </div>
+      <p class="text-center text-sm text-gray-500 mt-4">
+        <router-link to="/login" class="text-indigo-600 hover:underline">Back to sign in</router-link>
+      </p>
+    </template>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import * as api from '../../api/client.js'
+import AppSpinner from '../../components/ui/AppSpinner.vue'
+
+const email = ref('')
+const loading = ref(false)
+const error = ref(null)
+const sent = ref(false)
+
+async function submit() {
+  loading.value = true
+  error.value = null
+  try {
+    await api.passwordResetRequest(email.value)
+    sent.value = true
+  } catch {
+    // Anti-enumeration: always show success message (D-02)
+    sent.value = true
+  } finally {
+    loading.value = false
+  }
+}
+</script>
diff --git a/frontend/src/views/auth/RegisterView.vue b/frontend/src/views/auth/RegisterView.vue
new file mode 100644
index 0000000..22d3797
--- /dev/null
+++ b/frontend/src/views/auth/RegisterView.vue
@@ -0,0 +1,132 @@
+<template>
+  <div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-8 w-full">
+    <h2 class="text-2xl font-semibold text-gray-900 mb-1">Create your account</h2>
+    <p class="text-sm text-gray-500 mb-6">Start managing your documents securely.</p>
+
+    <form @submit.prevent="submit" class="space-y-4">
+      <!-- Handle -->
+      <div>
+        <label class="block text-sm font-semibold text-gray-700 mb-1">Username</label>
+        <input
+          v-model="handle"
+          type="text"
+          required
+          autocomplete="username"
+          class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+        />
+      </div>
+
+      <!-- Email -->
+      <div>
+        <label class="block text-sm font-semibold text-gray-700 mb-1">Email</label>
+        <input
+          v-model="email"
+          type="email"
+          required
+          autocomplete="email"
+          class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+        />
+      </div>
+
+      <!-- Password -->
+      <div>
+        <label class="block text-sm font-semibold text-gray-700 mb-1">Password</label>
+        <input
+          v-model="password"
+          type="password"
+          required
+          autocomplete="new-password"
+          class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+        />
+        <!-- Password strength indicator -->
+        <PasswordStrengthBar :password="password" />
+        <!-- HIBP breach inline error -->
+        <p v-if="breachError" class="mt-1 text-xs text-red-600">{{ breachError }}</p>
+      </div>
+
+      <!-- Confirm password -->
+      <div>
+        <label class="block text-sm font-semibold text-gray-700 mb-1">Confirm password</label>
+        <input
+          v-model="confirmPassword"
+          type="password"
+          required
+          autocomplete="new-password"
+          class="block w-full rounded-lg px-3 py-3 text-sm border border-gray-300 bg-white text-gray-900 transition-colors focus:ring-2 focus:ring-indigo-500 focus:border-indigo-500 focus:outline-none"
+        />
+        <p v-if="confirmError" class="mt-1 text-xs text-red-600">{{ confirmError }}</p>
+      </div>
+
+      <!-- Form-level error -->
+      <div
+        v-if="error"
+        class="p-3 rounded-lg bg-red-50 border border-red-200 text-sm text-red-700"
+      >
+        {{ error }}
+      </div>
+
+      <button
+        type="submit"
+        :disabled="loading"
+        class="w-full flex items-center justify-center gap-2 px-6 py-3 bg-indigo-600 text-white rounded-lg text-sm font-semibold hover:bg-indigo-700 transition-colors disabled:opacity-75 min-h-[44px]"
+      >
+        <AppSpinner v-if="loading" />
+        {{ loading ? 'Creating account…' : 'Create account' }}
+      </button>
+
+      <p class="text-center text-sm text-gray-500">
+        Already have an account?
+        <router-link to="/login" class="text-indigo-600 hover:underline">
+          Sign in
+        </router-link>
+      </p>
+    </form>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAuthStore } from '../../stores/auth.js'
+import PasswordStrengthBar from '../../components/auth/PasswordStrengthBar.vue'
+import AppSpinner from '../../components/ui/AppSpinner.vue'
+
+const authStore = useAuthStore()
+const router = useRouter()
+
+const handle = ref('')
+const email = ref('')
+const password = ref('')
+const confirmPassword = ref('')
+const loading = ref(false)
+const error = ref(null)
+const breachError = ref(null)
+const confirmError = ref(null)
+
+async function submit() {
+  // Client-side confirm check
+  confirmError.value = null
+  breachError.value = null
+  error.value = null
+
+  if (password.value !== confirmPassword.value) {
+    confirmError.value = 'Passwords do not match.'
+    return
+  }
+
+  loading.value = true
+  try {
+    await authStore.register(handle.value, email.value, password.value)
+    await router.push('/login')
+  } catch (e) {
+    const msg = e.message || ''
+    if (msg.toLowerCase().includes('breach') || msg.toLowerCase().includes('pwned')) {
+      breachError.value = msg
+    } else {
+      error.value = msg
+    }
+  } finally {
+    loading.value = false
+  }
+}
+</script>