diff --git a/src/App.vue b/src/App.vue
index ac76cf1..942d425 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -17,13 +17,26 @@
         >
           我的權限
         </router-link>
-        <router-link
-          to="/admin/permissions"
-          class="text-sm text-gray-600 hover:text-blue-600 transition-colors"
-          active-class="text-blue-600 font-medium"
-        >
-          權限管理
-        </router-link>
+
+        <div class="flex items-center gap-4 border-l border-gray-300 pl-6">
+          <el-dropdown @command="handleAdminNav">
+            <span class="text-sm text-gray-600 hover:text-blue-600 cursor-pointer transition-colors">
+              管理員 <el-icon class="el-icon--right"><arrow-down /></el-icon>
+            </span>
+            <template #dropdown>
+              <el-dropdown-menu>
+                <el-dropdown-item command="permissions">權限管理</el-dropdown-item>
+                <el-dropdown-divider />
+                <el-dropdown-item command="systems">系統管理</el-dropdown-item>
+                <el-dropdown-item command="modules">模組管理</el-dropdown-item>
+                <el-dropdown-item command="companies">公司管理</el-dropdown-item>
+                <el-dropdown-item command="sites">站台管理</el-dropdown-item>
+                <el-dropdown-item command="members">會員列表</el-dropdown-item>
+                <el-dropdown-item command="groups">權限群組</el-dropdown-item>
+              </el-dropdown-menu>
+            </template>
+          </el-dropdown>
+        </div>
       </div>
       <el-button v-if="authStore.isLoggedIn" size="small" @click="logout">登出</el-button>
     </nav>
@@ -37,6 +50,7 @@
 import { computed } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
+import { ArrowDown } from '@element-plus/icons-vue'
 
 const route = useRoute()
 const router = useRouter()
@@ -44,6 +58,19 @@ const authStore = useAuthStore()
 
 const isLoginPage = computed(() => route.name === 'login')
 
+function handleAdminNav(command) {
+  const routes = {
+    permissions: '/admin/permissions',
+    systems: '/admin/systems',
+    modules: '/admin/modules',
+    companies: '/admin/companies',
+    sites: '/admin/sites',
+    members: '/admin/members',
+    groups: '/admin/permission-groups'
+  }
+  router.push(routes[command])
+}
+
 function logout() {
   authStore.logout()
   router.push('/login')
diff --git a/src/api/companies.js b/src/api/companies.js
new file mode 100644
index 0000000..c62607a
--- /dev/null
+++ b/src/api/companies.js
@@ -0,0 +1,4 @@
+import { adminHttp } from './http'
+
+export const getCompanies = () => adminHttp.get('/admin/companies')
+export const createCompany = (data) => adminHttp.post('/admin/companies', data)
diff --git a/src/api/members.js b/src/api/members.js
new file mode 100644
index 0000000..7a10123
--- /dev/null
+++ b/src/api/members.js
@@ -0,0 +1,3 @@
+import { adminHttp } from './http'
+
+export const getMembers = () => adminHttp.get('/admin/members')
diff --git a/src/api/modules.js b/src/api/modules.js
new file mode 100644
index 0000000..f54f398
--- /dev/null
+++ b/src/api/modules.js
@@ -0,0 +1,4 @@
+import { adminHttp } from './http'
+
+export const getModules = () => adminHttp.get('/admin/modules')
+export const createModule = (data) => adminHttp.post('/admin/modules', data)
diff --git a/src/api/permission-groups.js b/src/api/permission-groups.js
new file mode 100644
index 0000000..3ebf8ea
--- /dev/null
+++ b/src/api/permission-groups.js
@@ -0,0 +1,16 @@
+import { adminHttp } from './http'
+
+export const getPermissionGroups = () => adminHttp.get('/admin/permission-groups')
+export const createPermissionGroup = (data) => adminHttp.post('/admin/permission-groups', data)
+
+export const addMemberToGroup = (groupKey, authentikSub) =>
+  adminHttp.post(`/admin/permission-groups/${groupKey}/members/${authentikSub}`)
+
+export const removeMemberFromGroup = (groupKey, authentikSub) =>
+  adminHttp.delete(`/admin/permission-groups/${groupKey}/members/${authentikSub}`)
+
+export const groupGrant = (groupKey, data) =>
+  adminHttp.post(`/admin/permission-groups/${groupKey}/permissions/grant`, data)
+
+export const groupRevoke = (groupKey, data) =>
+  adminHttp.post(`/admin/permission-groups/${groupKey}/permissions/revoke`, data)
diff --git a/src/api/sites.js b/src/api/sites.js
new file mode 100644
index 0000000..674bddf
--- /dev/null
+++ b/src/api/sites.js
@@ -0,0 +1,4 @@
+import { adminHttp } from './http'
+
+export const getSites = () => adminHttp.get('/admin/sites')
+export const createSite = (data) => adminHttp.post('/admin/sites', data)
diff --git a/src/api/systems.js b/src/api/systems.js
new file mode 100644
index 0000000..6d90cd7
--- /dev/null
+++ b/src/api/systems.js
@@ -0,0 +1,4 @@
+import { adminHttp } from './http'
+
+export const getSystems = () => adminHttp.get('/admin/systems')
+export const createSystem = (data) => adminHttp.post('/admin/systems', data)
diff --git a/src/pages/AuthCallbackPage.vue b/src/pages/AuthCallbackPage.vue
index d499733..4485362 100644
--- a/src/pages/AuthCallbackPage.vue
+++ b/src/pages/AuthCallbackPage.vue
@@ -1,55 +1,73 @@
 <template>
   <div class="flex items-center justify-center min-h-[70vh]">
     <el-card class="w-full max-w-md shadow-md">
-      <div class="text-center space-y-3">
-        <h1 class="text-xl font-bold text-gray-800">member.ose.tw</h1>
-        <p class="text-sm text-gray-500">正在處理登入結果...</p>
-        <el-alert
-          v-if="error"
-          :title="error"
-          type="error"
-          show-icon
-          :closable="false"
-        />
+      <div class="text-center">
+        <el-icon class="text-3xl text-blue-600 mb-3">
+          <Loading />
+        </el-icon>
+        <h2 class="text-lg font-bold text-gray-800 mb-2">正在登入...</h2>
+        <p v-if="!error" class="text-sm text-gray-500">
+          正在驗證身份，請稍候
+        </p>
+        <p v-if="error" class="text-sm text-red-600 font-medium">
+          {{ error }}
+        </p>
       </div>
     </el-card>
   </div>
 </template>
 
 <script setup>
-import { onMounted, ref } from 'vue'
-import { useRoute, useRouter } from 'vue-router'
+import { ref, onMounted } from 'vue'
+import { useRouter, useRoute } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
 import { exchangeOidcCode } from '@/api/auth'
+import { Loading } from '@element-plus/icons-vue'
 
-const route = useRoute()
 const router = useRouter()
+const route = useRoute()
 const authStore = useAuthStore()
 const error = ref('')
 
 onMounted(async () => {
-  const code = route.query.code
-  const redirect = sessionStorage.getItem('post_login_redirect') || '/me'
-  if (!code || typeof code !== 'string') {
-    error.value = '缺少授權碼，請重新登入'
-    return
-  }
-
   try {
-    const callbackUrl = `${window.location.origin}/auth/callback`
-    const res = await exchangeOidcCode(code, callbackUrl)
-    authStore.setToken(res.data.access_token)
-    await authStore.fetchMe()
-    sessionStorage.removeItem('post_login_redirect')
-    router.replace(typeof redirect === 'string' ? redirect : '/me')
-  } catch (err) {
-    authStore.logout()
-    const detail = err.response?.data?.detail
-    if (detail === 'authentik_code_exchange_failed') {
-      error.value = '授權碼交換失敗，請重新登入'
-    } else {
-      error.value = '登入失敗，請稍後再試'
+    const code = route.query.code
+    const state = route.query.state
+
+    if (!code) {
+      error.value = '缺少驗證代碼，登入失敗'
+      setTimeout(() => router.push('/login'), 2000)
+      return
     }
+
+    const redirectUri = `${window.location.origin}/auth/callback`
+    const res = await exchangeOidcCode(code, redirectUri)
+    const { access_token } = res.data
+
+    if (!access_token) {
+      error.value = '無法取得 access token'
+      setTimeout(() => router.push('/login'), 2000)
+      return
+    }
+
+    // 存 token 並取得使用者資料
+    authStore.setToken(access_token)
+    await authStore.fetchMe()
+
+    // 導向原頁面或預設的 /me
+    const redirect = sessionStorage.getItem('post_login_redirect') || '/me'
+    sessionStorage.removeItem('post_login_redirect')
+    router.push(redirect)
+  } catch (err) {
+    const detail = err.response?.data?.detail
+    if (detail === 'invalid_authorization_code') {
+      error.value = '授權代碼無效，請重新登入'
+    } else if (detail) {
+      error.value = `登入失敗：${detail}`
+    } else {
+      error.value = '登入過程出錯，請重新登入'
+    }
+    setTimeout(() => router.push('/login'), 3000)
   }
 })
 </script>
diff --git a/src/pages/admin/CompaniesPage.vue b/src/pages/admin/CompaniesPage.vue
new file mode 100644
index 0000000..5744050
--- /dev/null
+++ b/src/pages/admin/CompaniesPage.vue
@@ -0,0 +1,96 @@
+<template>
+  <div>
+    <div class="flex items-center justify-between mb-6">
+      <h2 class="text-xl font-bold text-gray-800">公司管理</h2>
+      <el-button type="primary" @click="showDialog = true" :icon="Plus">新增公司</el-button>
+    </div>
+
+    <el-alert
+      v-if="error"
+      :title="errorMsg"
+      type="error"
+      show-icon
+      :closable="false"
+      class="mb-4"
+    />
+
+    <el-skeleton v-if="loading" :rows="4" animated />
+
+    <el-table v-else :data="companies" stripe border class="w-full shadow-sm">
+      <el-empty v-if="companies.length === 0" slot="empty" description="目前無公司" />
+      <el-table-column prop="company_key" label="Company Key" width="200" />
+      <el-table-column prop="name" label="名稱" min-width="180" />
+    </el-table>
+
+    <!-- 新增 Dialog -->
+    <el-dialog v-model="showDialog" title="新增公司" @close="resetForm">
+      <el-form :model="form" label-width="100px">
+        <el-form-item label="Company Key">
+          <el-input v-model="form.company_key" placeholder="company-001" />
+        </el-form-item>
+        <el-form-item label="名稱">
+          <el-input v-model="form.name" placeholder="公司名稱" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showDialog = false">取消</el-button>
+        <el-button type="primary" :loading="submitting" @click="handleCreate">確認</el-button>
+      </template>
+    </el-dialog>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { ElMessage } from 'element-plus'
+import { Plus } from '@element-plus/icons-vue'
+import { getCompanies, createCompany } from '@/api/companies'
+
+const companies = ref([])
+const loading = ref(false)
+const error = ref(false)
+const errorMsg = ref('')
+const showDialog = ref(false)
+const submitting = ref(false)
+
+const form = ref({ company_key: '', name: '' })
+
+async function load() {
+  loading.value = true
+  error.value = false
+  try {
+    const res = await getCompanies()
+    companies.value = res.data || []
+  } catch (err) {
+    error.value = true
+    errorMsg.value = '載入失敗，請稍後再試'
+  } finally {
+    loading.value = false
+  }
+}
+
+function resetForm() {
+  form.value = { company_key: '', name: '' }
+}
+
+async function handleCreate() {
+  if (!form.value.company_key || !form.value.name) {
+    ElMessage.warning('請填寫完整資訊')
+    return
+  }
+  submitting.value = true
+  try {
+    await createCompany(form.value)
+    ElMessage.success('新增成功')
+    showDialog.value = false
+    resetForm()
+    await load()
+  } catch (err) {
+    ElMessage.error('新增失敗，請稍後再試')
+  } finally {
+    submitting.value = false
+  }
+}
+
+onMounted(load)
+</script>
diff --git a/src/pages/admin/MembersPage.vue b/src/pages/admin/MembersPage.vue
new file mode 100644
index 0000000..ca06b61
--- /dev/null
+++ b/src/pages/admin/MembersPage.vue
@@ -0,0 +1,53 @@
+<template>
+  <div>
+    <div class="flex items-center justify-between mb-6">
+      <h2 class="text-xl font-bold text-gray-800">會員列表</h2>
+      <el-button :loading="loading" @click="load" :icon="Refresh" size="small">重新整理</el-button>
+    </div>
+
+    <el-alert
+      v-if="error"
+      :title="errorMsg"
+      type="error"
+      show-icon
+      :closable="false"
+      class="mb-4"
+    />
+
+    <el-skeleton v-if="loading" :rows="4" animated />
+
+    <el-table v-else :data="members" stripe border class="w-full shadow-sm">
+      <el-empty v-if="members.length === 0" slot="empty" description="目前無會員" />
+      <el-table-column prop="authentik_sub" label="Authentik Sub" min-width="200" />
+      <el-table-column prop="email" label="Email" min-width="200" />
+      <el-table-column prop="display_name" label="顯示名稱" width="150" />
+    </el-table>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { Refresh } from '@element-plus/icons-vue'
+import { getMembers } from '@/api/members'
+
+const members = ref([])
+const loading = ref(false)
+const error = ref(false)
+const errorMsg = ref('')
+
+async function load() {
+  loading.value = true
+  error.value = false
+  try {
+    const res = await getMembers()
+    members.value = res.data || []
+  } catch (err) {
+    error.value = true
+    errorMsg.value = '載入失敗，請稍後再試'
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(load)
+</script>
diff --git a/src/pages/admin/ModulesPage.vue b/src/pages/admin/ModulesPage.vue
new file mode 100644
index 0000000..416db1f
--- /dev/null
+++ b/src/pages/admin/ModulesPage.vue
@@ -0,0 +1,100 @@
+<template>
+  <div>
+    <div class="flex items-center justify-between mb-6">
+      <h2 class="text-xl font-bold text-gray-800">模組管理</h2>
+      <el-button type="primary" @click="showDialog = true" :icon="Plus">新增模組</el-button>
+    </div>
+
+    <el-alert
+      v-if="error"
+      :title="errorMsg"
+      type="error"
+      show-icon
+      :closable="false"
+      class="mb-4"
+    />
+
+    <el-skeleton v-if="loading" :rows="4" animated />
+
+    <el-table v-else :data="modules" stripe border class="w-full shadow-sm">
+      <el-empty v-if="modules.length === 0" slot="empty" description="目前無模組" />
+      <el-table-column prop="system_key" label="System Key" width="140" />
+      <el-table-column prop="module_key" label="Module Key" width="160" />
+      <el-table-column prop="name" label="名稱" min-width="180" />
+    </el-table>
+
+    <!-- 新增 Dialog -->
+    <el-dialog v-model="showDialog" title="新增模組" @close="resetForm">
+      <el-form :model="form" label-width="120px">
+        <el-form-item label="System Key">
+          <el-input v-model="form.system_key" placeholder="mkt" />
+        </el-form-item>
+        <el-form-item label="Module Key">
+          <el-input v-model="form.module_key" placeholder="campaign" />
+        </el-form-item>
+        <el-form-item label="名稱">
+          <el-input v-model="form.name" placeholder="行銷活動" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showDialog = false">取消</el-button>
+        <el-button type="primary" :loading="submitting" @click="handleCreate">確認</el-button>
+      </template>
+    </el-dialog>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { ElMessage } from 'element-plus'
+import { Plus } from '@element-plus/icons-vue'
+import { getModules, createModule } from '@/api/modules'
+
+const modules = ref([])
+const loading = ref(false)
+const error = ref(false)
+const errorMsg = ref('')
+const showDialog = ref(false)
+const submitting = ref(false)
+
+const form = ref({ system_key: '', module_key: '', name: '' })
+
+async function load() {
+  loading.value = true
+  error.value = false
+  try {
+    const res = await getModules()
+    modules.value = res.data || []
+  } catch (err) {
+    error.value = true
+    errorMsg.value = '載入失敗，請稍後再試'
+  } finally {
+    loading.value = false
+  }
+}
+
+function resetForm() {
+  form.value = { system_key: '', module_key: '', name: '' }
+}
+
+async function handleCreate() {
+  if (!form.value.system_key || !form.value.module_key || !form.value.name) {
+    ElMessage.warning('請填寫完整資訊')
+    return
+  }
+  submitting.value = true
+  try {
+    await createModule(form.value)
+    ElMessage.success('新增成功')
+    showDialog.value = false
+    resetForm()
+    await load()
+  } catch (err) {
+    ElMessage.error('新增失敗，請稍後再試')
+  } finally {
+    submitting.value = false
+  }
+}
+
+onMounted(load)
+</script>
diff --git a/src/pages/admin/PermissionGroupsPage.vue b/src/pages/admin/PermissionGroupsPage.vue
new file mode 100644
index 0000000..19517f4
--- /dev/null
+++ b/src/pages/admin/PermissionGroupsPage.vue
@@ -0,0 +1,296 @@
+<template>
+  <div>
+    <h2 class="text-xl font-bold text-gray-800 mb-6">權限群組管理</h2>
+
+    <!-- 認證 -->
+    <el-card class="mb-6 shadow-sm">
+      <template #header>
+        <div class="flex items-center justify-between">
+          <span class="font-medium text-gray-700">管理員認證</span>
+          <el-tag v-if="credsSaved" type="success" size="small">已儲存（session）</el-tag>
+          <el-tag v-else type="warning" size="small">未設定</el-tag>
+        </div>
+      </template>
+      <el-form :model="credsForm" inline>
+        <el-form-item label="X-Client-Key">
+          <el-input v-model="credsForm.clientKey" placeholder="client key" style="width: 220px" show-password />
+        </el-form-item>
+        <el-form-item label="X-API-Key">
+          <el-input v-model="credsForm.apiKey" placeholder="api key" style="width: 220px" show-password />
+        </el-form-item>
+        <el-form-item>
+          <el-button type="primary" @click="saveCreds">儲存認證</el-button>
+          <el-button v-if="credsSaved" @click="clearCreds" class="ml-2">清除</el-button>
+        </el-form-item>
+      </el-form>
+    </el-card>
+
+    <el-tabs v-model="activeTab" type="border-card" class="shadow-sm">
+      <!-- Groups Tab -->
+      <el-tab-pane label="群組管理" name="groups">
+        <div class="mt-4">
+          <el-button v-if="credsSaved" type="primary" @click="showCreateGroup = true" :icon="Plus" class="mb-4">
+            新增群組
+          </el-button>
+          <p v-if="!credsSaved" class="text-xs text-yellow-600 mb-4">請先設定管理員認證</p>
+
+          <el-skeleton v-if="loadingGroups" :rows="4" animated />
+
+          <el-table v-else :data="groups" stripe border class="w-full">
+            <el-empty v-if="groups.length === 0" slot="empty" description="目前無群組" />
+            <el-table-column prop="group_key" label="Group Key" width="180" />
+            <el-table-column prop="name" label="群組名稱" min-width="200" />
+          </el-table>
+        </div>
+      </el-tab-pane>
+
+      <!-- Members Tab -->
+      <el-tab-pane label="綁定會員" name="members" :disabled="!credsSaved">
+        <div class="mt-4">
+          <el-form :model="memberForm" label-width="120px" class="max-w-xl mb-4">
+            <el-form-item label="Group Key">
+              <el-select v-model="memberForm.groupKey" placeholder="選擇群組">
+                <el-option v-for="g in groups" :key="g.group_key" :label="`${g.name} (${g.group_key})`" :value="g.group_key" />
+              </el-select>
+            </el-form-item>
+            <el-form-item label="Authentik Sub">
+              <el-input v-model="memberForm.authentikSub" placeholder="authentik-sub-xxx" />
+            </el-form-item>
+            <el-form-item>
+              <el-button type="primary" :loading="addingMember" @click="handleAddMember" :disabled="!memberForm.groupKey || !memberForm.authentikSub">
+                加入群組
+              </el-button>
+            </el-form-item>
+          </el-form>
+
+          <p v-if="memberError" class="text-red-600 text-sm mb-2">{{ memberError }}</p>
+          <p v-if="memberSuccess" class="text-green-600 text-sm mb-2">{{ memberSuccess }}</p>
+        </div>
+      </el-tab-pane>
+
+      <!-- Permissions Tab -->
+      <el-tab-pane label="群組授權" name="permissions" :disabled="!credsSaved">
+        <div class="mt-4">
+          <el-form :model="groupPermForm" label-width="120px" class="max-w-xl mb-4">
+            <el-form-item label="Group Key">
+              <el-select v-model="groupPermForm.groupKey" placeholder="選擇群組">
+                <el-option v-for="g in groups" :key="g.group_key" :label="`${g.name} (${g.group_key})`" :value="g.group_key" />
+              </el-select>
+            </el-form-item>
+            <el-form-item label="Scope Type">
+              <el-select v-model="groupPermForm.scope_type" placeholder="company or site">
+                <el-option label="Company" value="company" />
+                <el-option label="Site" value="site" />
+              </el-select>
+            </el-form-item>
+            <el-form-item label="Scope ID">
+              <el-input v-model="groupPermForm.scope_id" placeholder="company_key or site_key" />
+            </el-form-item>
+            <el-form-item label="系統">
+              <el-input v-model="groupPermForm.system" placeholder="mkt" />
+            </el-form-item>
+            <el-form-item label="模組（選填）">
+              <el-input v-model="groupPermForm.module" placeholder="campaign" clearable />
+            </el-form-item>
+            <el-form-item label="操作">
+              <el-input v-model="groupPermForm.action" placeholder="view" />
+            </el-form-item>
+            <el-form-item>
+              <el-button
+                type="primary"
+                :loading="grantingGroupPerm"
+                @click="handleGroupGrant"
+                :disabled="!groupPermForm.groupKey || !groupPermForm.scope_type || !groupPermForm.scope_id || !groupPermForm.system || !groupPermForm.action"
+              >
+                Grant 授權
+              </el-button>
+              <el-button
+                type="danger"
+                class="ml-2"
+                :loading="revokingGroupPerm"
+                @click="handleGroupRevoke"
+                :disabled="!groupPermForm.groupKey || !groupPermForm.scope_type || !groupPermForm.scope_id || !groupPermForm.system || !groupPermForm.action"
+              >
+                Revoke 撤銷
+              </el-button>
+            </el-form-item>
+          </el-form>
+
+          <p v-if="groupPermError" class="text-red-600 text-sm mb-2">{{ groupPermError }}</p>
+          <p v-if="groupPermSuccess" class="text-green-600 text-sm mb-2">{{ groupPermSuccess }}</p>
+        </div>
+      </el-tab-pane>
+    </el-tabs>
+
+    <!-- Create Group Dialog -->
+    <el-dialog v-model="showCreateGroup" title="新增群組" @close="resetCreateForm">
+      <el-form :model="createForm" label-width="120px">
+        <el-form-item label="Group Key">
+          <el-input v-model="createForm.group_key" placeholder="group-001" />
+        </el-form-item>
+        <el-form-item label="群組名稱">
+          <el-input v-model="createForm.name" placeholder="群組名稱" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showCreateGroup = false">取消</el-button>
+        <el-button type="primary" :loading="creatingGroup" @click="handleCreateGroup">確認</el-button>
+      </template>
+    </el-dialog>
+  </div>
+</template>
+
+<script setup>
+import { ref, reactive, computed, onMounted } from 'vue'
+import { ElMessage } from 'element-plus'
+import { Plus } from '@element-plus/icons-vue'
+import { usePermissionStore } from '@/stores/permission'
+import {
+  getPermissionGroups,
+  createPermissionGroup,
+  addMemberToGroup,
+  removeMemberFromGroup,
+  groupGrant,
+  groupRevoke
+} from '@/api/permission-groups'
+
+const permissionStore = usePermissionStore()
+const activeTab = ref('groups')
+
+// 認證
+const credsForm = reactive({
+  clientKey: permissionStore.adminClientKey,
+  apiKey: permissionStore.adminApiKey
+})
+
+const credsSaved = computed(() => permissionStore.hasAdminCreds())
+
+function saveCreds() {
+  if (!credsForm.clientKey || !credsForm.apiKey) {
+    ElMessage.warning('請填寫完整認證')
+    return
+  }
+  permissionStore.setAdminCreds(credsForm.clientKey, credsForm.apiKey)
+  ElMessage.success('認證已儲存（session）')
+}
+
+function clearCreds() {
+  permissionStore.clearAdminCreds()
+  credsForm.clientKey = ''
+  credsForm.apiKey = ''
+  ElMessage.info('認證已清除')
+}
+
+// Groups
+const groups = ref([])
+const loadingGroups = ref(false)
+
+async function loadGroups() {
+  loadingGroups.value = true
+  try {
+    const res = await getPermissionGroups()
+    groups.value = res.data || []
+  } catch (err) {
+    ElMessage.error('載入群組失敗')
+  } finally {
+    loadingGroups.value = false
+  }
+}
+
+// Create Group
+const showCreateGroup = ref(false)
+const creatingGroup = ref(false)
+const createForm = reactive({ group_key: '', name: '' })
+
+function resetCreateForm() {
+  createForm.group_key = ''
+  createForm.name = ''
+}
+
+async function handleCreateGroup() {
+  if (!createForm.group_key || !createForm.name) {
+    ElMessage.warning('請填寫完整資訊')
+    return
+  }
+  creatingGroup.value = true
+  try {
+    await createPermissionGroup(createForm)
+    ElMessage.success('新增成功')
+    showCreateGroup.value = false
+    resetCreateForm()
+    await loadGroups()
+  } catch (err) {
+    ElMessage.error('新增失敗')
+  } finally {
+    creatingGroup.value = false
+  }
+}
+
+// Add Member
+const memberForm = reactive({ groupKey: '', authentikSub: '' })
+const addingMember = ref(false)
+const memberError = ref('')
+const memberSuccess = ref('')
+
+async function handleAddMember() {
+  memberError.value = ''
+  memberSuccess.value = ''
+  addingMember.value = true
+  try {
+    await addMemberToGroup(memberForm.groupKey, memberForm.authentikSub)
+    memberSuccess.value = '加入成功'
+    memberForm.groupKey = ''
+    memberForm.authentikSub = ''
+  } catch (err) {
+    memberError.value = '加入失敗，請稍後再試'
+  } finally {
+    addingMember.value = false
+  }
+}
+
+// Group Grant/Revoke
+const groupPermForm = reactive({
+  groupKey: '',
+  scope_type: '',
+  scope_id: '',
+  system: '',
+  module: '',
+  action: ''
+})
+const grantingGroupPerm = ref(false)
+const revokingGroupPerm = ref(false)
+const groupPermError = ref('')
+const groupPermSuccess = ref('')
+
+async function handleGroupGrant() {
+  groupPermError.value = ''
+  groupPermSuccess.value = ''
+  grantingGroupPerm.value = true
+  try {
+    const { groupKey, ...permData } = groupPermForm
+    await groupGrant(groupKey, permData)
+    groupPermSuccess.value = 'Grant 成功'
+  } catch (err) {
+    groupPermError.value = 'Grant 失敗'
+  } finally {
+    grantingGroupPerm.value = false
+  }
+}
+
+async function handleGroupRevoke() {
+  groupPermError.value = ''
+  groupPermSuccess.value = ''
+  revokingGroupPerm.value = true
+  try {
+    const { groupKey, ...permData } = groupPermForm
+    await groupRevoke(groupKey, permData)
+    groupPermSuccess.value = 'Revoke 成功'
+  } catch (err) {
+    groupPermError.value = 'Revoke 失敗'
+  } finally {
+    revokingGroupPerm.value = false
+  }
+}
+
+onMounted(loadGroups)
+</script>
diff --git a/src/pages/admin/SitesPage.vue b/src/pages/admin/SitesPage.vue
new file mode 100644
index 0000000..7a87dd1
--- /dev/null
+++ b/src/pages/admin/SitesPage.vue
@@ -0,0 +1,100 @@
+<template>
+  <div>
+    <div class="flex items-center justify-between mb-6">
+      <h2 class="text-xl font-bold text-gray-800">站台管理</h2>
+      <el-button type="primary" @click="showDialog = true" :icon="Plus">新增站台</el-button>
+    </div>
+
+    <el-alert
+      v-if="error"
+      :title="errorMsg"
+      type="error"
+      show-icon
+      :closable="false"
+      class="mb-4"
+    />
+
+    <el-skeleton v-if="loading" :rows="4" animated />
+
+    <el-table v-else :data="sites" stripe border class="w-full shadow-sm">
+      <el-empty v-if="sites.length === 0" slot="empty" description="目前無站台" />
+      <el-table-column prop="site_key" label="Site Key" width="160" />
+      <el-table-column prop="company_key" label="Company Key" width="160" />
+      <el-table-column prop="name" label="名稱" min-width="180" />
+    </el-table>
+
+    <!-- 新增 Dialog -->
+    <el-dialog v-model="showDialog" title="新增站台" @close="resetForm">
+      <el-form :model="form" label-width="120px">
+        <el-form-item label="Site Key">
+          <el-input v-model="form.site_key" placeholder="site-001" />
+        </el-form-item>
+        <el-form-item label="Company Key">
+          <el-input v-model="form.company_key" placeholder="company-001" />
+        </el-form-item>
+        <el-form-item label="名稱">
+          <el-input v-model="form.name" placeholder="站台名稱" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showDialog = false">取消</el-button>
+        <el-button type="primary" :loading="submitting" @click="handleCreate">確認</el-button>
+      </template>
+    </el-dialog>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { ElMessage } from 'element-plus'
+import { Plus } from '@element-plus/icons-vue'
+import { getSites, createSite } from '@/api/sites'
+
+const sites = ref([])
+const loading = ref(false)
+const error = ref(false)
+const errorMsg = ref('')
+const showDialog = ref(false)
+const submitting = ref(false)
+
+const form = ref({ site_key: '', company_key: '', name: '' })
+
+async function load() {
+  loading.value = true
+  error.value = false
+  try {
+    const res = await getSites()
+    sites.value = res.data || []
+  } catch (err) {
+    error.value = true
+    errorMsg.value = '載入失敗，請稍後再試'
+  } finally {
+    loading.value = false
+  }
+}
+
+function resetForm() {
+  form.value = { site_key: '', company_key: '', name: '' }
+}
+
+async function handleCreate() {
+  if (!form.value.site_key || !form.value.company_key || !form.value.name) {
+    ElMessage.warning('請填寫完整資訊')
+    return
+  }
+  submitting.value = true
+  try {
+    await createSite(form.value)
+    ElMessage.success('新增成功')
+    showDialog.value = false
+    resetForm()
+    await load()
+  } catch (err) {
+    ElMessage.error('新增失敗，請稍後再試')
+  } finally {
+    submitting.value = false
+  }
+}
+
+onMounted(load)
+</script>
diff --git a/src/pages/admin/SystemsPage.vue b/src/pages/admin/SystemsPage.vue
new file mode 100644
index 0000000..305cbc5
--- /dev/null
+++ b/src/pages/admin/SystemsPage.vue
@@ -0,0 +1,96 @@
+<template>
+  <div>
+    <div class="flex items-center justify-between mb-6">
+      <h2 class="text-xl font-bold text-gray-800">系統管理</h2>
+      <el-button type="primary" @click="showDialog = true" :icon="Plus">新增系統</el-button>
+    </div>
+
+    <el-alert
+      v-if="error"
+      :title="errorMsg"
+      type="error"
+      show-icon
+      :closable="false"
+      class="mb-4"
+    />
+
+    <el-skeleton v-if="loading" :rows="4" animated />
+
+    <el-table v-else :data="systems" stripe border class="w-full shadow-sm">
+      <el-empty v-if="systems.length === 0" slot="empty" description="目前無系統" />
+      <el-table-column prop="system_key" label="System Key" width="200" />
+      <el-table-column prop="name" label="名稱" min-width="180" />
+    </el-table>
+
+    <!-- 新增 Dialog -->
+    <el-dialog v-model="showDialog" title="新增系統" @close="resetForm">
+      <el-form :model="form" label-width="100px">
+        <el-form-item label="System Key">
+          <el-input v-model="form.system_key" placeholder="mkt" />
+        </el-form-item>
+        <el-form-item label="名稱">
+          <el-input v-model="form.name" placeholder="行銷平台" />
+        </el-form-item>
+      </el-form>
+      <template #footer>
+        <el-button @click="showDialog = false">取消</el-button>
+        <el-button type="primary" :loading="submitting" @click="handleCreate">確認</el-button>
+      </template>
+    </el-dialog>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue'
+import { ElMessage } from 'element-plus'
+import { Plus } from '@element-plus/icons-vue'
+import { getSystems, createSystem } from '@/api/systems'
+
+const systems = ref([])
+const loading = ref(false)
+const error = ref(false)
+const errorMsg = ref('')
+const showDialog = ref(false)
+const submitting = ref(false)
+
+const form = ref({ system_key: '', name: '' })
+
+async function load() {
+  loading.value = true
+  error.value = false
+  try {
+    const res = await getSystems()
+    systems.value = res.data || []
+  } catch (err) {
+    error.value = true
+    errorMsg.value = '載入失敗，請稍後再試'
+  } finally {
+    loading.value = false
+  }
+}
+
+function resetForm() {
+  form.value = { system_key: '', name: '' }
+}
+
+async function handleCreate() {
+  if (!form.value.system_key || !form.value.name) {
+    ElMessage.warning('請填寫完整資訊')
+    return
+  }
+  submitting.value = true
+  try {
+    await createSystem(form.value)
+    ElMessage.success('新增成功')
+    showDialog.value = false
+    resetForm()
+    await load()
+  } catch (err) {
+    ElMessage.error('新增失敗，請稍後再試')
+  } finally {
+    submitting.value = false
+  }
+}
+
+onMounted(load)
+</script>
diff --git a/src/pages/permissions/PermissionAdminPage.vue b/src/pages/permissions/PermissionAdminPage.vue
index 935442a..c1de8bb 100644
--- a/src/pages/permissions/PermissionAdminPage.vue
+++ b/src/pages/permissions/PermissionAdminPage.vue
@@ -57,13 +57,19 @@
             <el-input v-model="grantForm.display_name" placeholder="User Name" />
           </el-form-item>
           <el-form-item label="Scope 類型" prop="scope_type">
-            <el-input v-model="grantForm.scope_type" placeholder="site" />
+            <el-select v-model="grantForm.scope_type" placeholder="選擇 Scope 類型">
+              <el-option label="Company" value="company" />
+              <el-option label="Site" value="site" />
+            </el-select>
           </el-form-item>
           <el-form-item label="Scope ID" prop="scope_id">
-            <el-input v-model="grantForm.scope_id" placeholder="tw-main" />
+            <el-input v-model="grantForm.scope_id" placeholder="company_key or site_key" />
           </el-form-item>
-          <el-form-item label="模組" prop="module">
-            <el-input v-model="grantForm.module" placeholder="campaign" />
+          <el-form-item label="系統" prop="system">
+            <el-input v-model="grantForm.system" placeholder="mkt" />
+          </el-form-item>
+          <el-form-item label="模組（選填）" prop="module">
+            <el-input v-model="grantForm.module" placeholder="campaign（空值代表系統層）" clearable />
           </el-form-item>
           <el-form-item label="操作" prop="action">
             <el-input v-model="grantForm.action" placeholder="view" />
@@ -115,13 +121,19 @@
             <el-input v-model="revokeForm.authentik_sub" placeholder="authentik-sub-xxx" />
           </el-form-item>
           <el-form-item label="Scope 類型" prop="scope_type">
-            <el-input v-model="revokeForm.scope_type" placeholder="site" />
+            <el-select v-model="revokeForm.scope_type" placeholder="選擇 Scope 類型">
+              <el-option label="Company" value="company" />
+              <el-option label="Site" value="site" />
+            </el-select>
           </el-form-item>
           <el-form-item label="Scope ID" prop="scope_id">
-            <el-input v-model="revokeForm.scope_id" placeholder="tw-main" />
+            <el-input v-model="revokeForm.scope_id" placeholder="company_key or site_key" />
           </el-form-item>
-          <el-form-item label="模組" prop="module">
-            <el-input v-model="revokeForm.module" placeholder="campaign" />
+          <el-form-item label="系統" prop="system">
+            <el-input v-model="revokeForm.system" placeholder="mkt" />
+          </el-form-item>
+          <el-form-item label="模組（選填）" prop="module">
+            <el-input v-model="revokeForm.module" placeholder="campaign（空值代表系統層）" clearable />
           </el-form-item>
           <el-form-item label="操作" prop="action">
             <el-input v-model="revokeForm.action" placeholder="view" />
@@ -207,6 +219,7 @@ const grantForm = reactive({
   display_name: '',
   scope_type: '',
   scope_id: '',
+  system: '',
   module: '',
   action: ''
 })
@@ -218,7 +231,7 @@ const grantRules = {
   display_name: [required],
   scope_type: [required],
   scope_id: [required],
-  module: [required],
+  system: [required],
   action: [required]
 }
 
@@ -255,6 +268,7 @@ const revokeForm = reactive({
   authentik_sub: '',
   scope_type: '',
   scope_id: '',
+  system: '',
   module: '',
   action: ''
 })
@@ -263,7 +277,7 @@ const revokeRules = {
   authentik_sub: [required],
   scope_type: [required],
   scope_id: [required],
-  module: [required],
+  system: [required],
   action: [required]
 }
 
diff --git a/src/pages/permissions/PermissionSnapshotPage.vue b/src/pages/permissions/PermissionSnapshotPage.vue
index 1e735dc..59b5e94 100644
--- a/src/pages/permissions/PermissionSnapshotPage.vue
+++ b/src/pages/permissions/PermissionSnapshotPage.vue
@@ -33,9 +33,10 @@
         border
         class="w-full shadow-sm"
       >
-        <el-table-column prop="scope_type" label="Scope 類型" width="130" />
-        <el-table-column prop="scope_id" label="Scope ID" min-width="160" />
-        <el-table-column prop="module" label="模組" width="140" />
+        <el-table-column prop="scope_type" label="Scope 類型" width="100" />
+        <el-table-column prop="scope_id" label="Scope ID" min-width="140" />
+        <el-table-column prop="system" label="系統" width="120" />
+        <el-table-column prop="module" label="模組" width="120" />
         <el-table-column prop="action" label="操作" width="100" />
       </el-table>
     </template>
diff --git a/src/router/index.js b/src/router/index.js
index fe08486..dbb70ee 100644
--- a/src/router/index.js
+++ b/src/router/index.js
@@ -29,6 +29,36 @@ const routes = [
     path: '/admin/permissions',
     name: 'admin-permissions',
     component: () => import('@/pages/permissions/PermissionAdminPage.vue')
+  },
+  {
+    path: '/admin/systems',
+    name: 'admin-systems',
+    component: () => import('@/pages/admin/SystemsPage.vue')
+  },
+  {
+    path: '/admin/modules',
+    name: 'admin-modules',
+    component: () => import('@/pages/admin/ModulesPage.vue')
+  },
+  {
+    path: '/admin/companies',
+    name: 'admin-companies',
+    component: () => import('@/pages/admin/CompaniesPage.vue')
+  },
+  {
+    path: '/admin/sites',
+    name: 'admin-sites',
+    component: () => import('@/pages/admin/SitesPage.vue')
+  },
+  {
+    path: '/admin/members',
+    name: 'admin-members',
+    component: () => import('@/pages/admin/MembersPage.vue')
+  },
+  {
+    path: '/admin/permission-groups',
+    name: 'admin-permission-groups',
+    component: () => import('@/pages/admin/PermissionGroupsPage.vue')
   }
 ]
 
diff --git a/src/stores/admin.js b/src/stores/admin.js
new file mode 100644
index 0000000..f802f47
--- /dev/null
+++ b/src/stores/admin.js
@@ -0,0 +1,39 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { getSystems } from '@/api/systems'
+import { getModules } from '@/api/modules'
+import { getCompanies } from '@/api/companies'
+import { getSites } from '@/api/sites'
+
+export const useAdminStore = defineStore('admin', () => {
+  const systems = ref([])
+  const modules = ref([])
+  const companies = ref([])
+  const sites = ref([])
+
+  async function loadAllData() {
+    try {
+      const [sysRes, modRes, comRes, siteRes] = await Promise.all([
+        getSystems(),
+        getModules(),
+        getCompanies(),
+        getSites()
+      ])
+      systems.value = sysRes.data || []
+      modules.value = modRes.data || []
+      companies.value = comRes.data || []
+      sites.value = siteRes.data || []
+    } catch (err) {
+      console.error('Error loading admin data:', err)
+      throw err
+    }
+  }
+
+  return {
+    systems,
+    modules,
+    companies,
+    sites,
+    loadAllData
+  }
+})