diff --git a/offer_backend/apps/__init__.py b/offer_backend/apps/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/accounts/__init__.py b/offer_backend/apps/accounts/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/accounts/apps.py b/offer_backend/apps/accounts/apps.py
new file mode 100644
index 0000000..d45b5ba
--- /dev/null
+++ b/offer_backend/apps/accounts/apps.py
@@ -0,0 +1,7 @@
+from django.apps import AppConfig
+
+
+class AccountsConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.accounts'
+    verbose_name = '账户管理'
diff --git a/offer_backend/apps/accounts/migrations/0001_initial.py b/offer_backend/apps/accounts/migrations/0001_initial.py
new file mode 100644
index 0000000..8928f4d
--- /dev/null
+++ b/offer_backend/apps/accounts/migrations/0001_initial.py
@@ -0,0 +1,48 @@
+# Generated by Django 4.2.20 on 2026-03-24 09:09
+
+import django.contrib.auth.models
+import django.contrib.auth.validators
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('auth', '0012_alter_user_first_name_max_length'),
+        ('organizations', '__first__'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='User',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('password', models.CharField(max_length=128, verbose_name='password')),
+                ('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
+                ('is_superuser', models.BooleanField(default=False, help_text='Designates that this user has all permissions without explicitly assigning them.', verbose_name='superuser status')),
+                ('username', models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username')),
+                ('first_name', models.CharField(blank=True, max_length=150, verbose_name='first name')),
+                ('last_name', models.CharField(blank=True, max_length=150, verbose_name='last name')),
+                ('email', models.EmailField(blank=True, max_length=254, verbose_name='email address')),
+                ('is_staff', models.BooleanField(default=False, help_text='Designates whether the user can log into this admin site.', verbose_name='staff status')),
+                ('is_active', models.BooleanField(default=True, help_text='Designates whether this user should be treated as active. Unselect this instead of deleting accounts.', verbose_name='active')),
+                ('date_joined', models.DateTimeField(default=django.utils.timezone.now, verbose_name='date joined')),
+                ('role', models.CharField(choices=[('superadmin', '超级管理员'), ('admin', '公司管理员'), ('seeker', '求职者')], default='seeker', max_length=20)),
+                ('phone', models.CharField(blank=True, max_length=20)),
+                ('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.group', verbose_name='groups')),
+                ('organization', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='admins', to='organizations.organization')),
+                ('user_permissions', models.ManyToManyField(blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user', to='auth.permission', verbose_name='user permissions')),
+            ],
+            options={
+                'verbose_name': '用户',
+                'verbose_name_plural': '用户',
+            },
+            managers=[
+                ('objects', django.contrib.auth.models.UserManager()),
+            ],
+        ),
+    ]
diff --git a/offer_backend/apps/accounts/migrations/__init__.py b/offer_backend/apps/accounts/migrations/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/accounts/models.py b/offer_backend/apps/accounts/models.py
new file mode 100644
index 0000000..ae0bdb9
--- /dev/null
+++ b/offer_backend/apps/accounts/models.py
@@ -0,0 +1,34 @@
+from django.contrib.auth.models import AbstractUser
+from django.db import models
+
+
+class User(AbstractUser):
+    ROLE_CHOICES = [
+        ('superadmin', '超级管理员'),
+        ('admin', '公司管理员'),
+        ('seeker', '求职者'),
+    ]
+    role = models.CharField(max_length=20, choices=ROLE_CHOICES, default='seeker')
+    phone = models.CharField(max_length=20, blank=True)
+    organization = models.ForeignKey(
+        'organizations.Organization',
+        null=True, blank=True,
+        on_delete=models.SET_NULL,
+        related_name='admins'
+    )
+
+    @property
+    def is_superadmin(self):
+        return self.role == 'superadmin'
+
+    @property
+    def is_admin(self):
+        return self.role == 'admin'
+
+    @property
+    def is_seeker(self):
+        return self.role == 'seeker'
+
+    class Meta:
+        verbose_name = '用户'
+        verbose_name_plural = '用户'
diff --git a/offer_backend/apps/accounts/permissions.py b/offer_backend/apps/accounts/permissions.py
new file mode 100644
index 0000000..d725044
--- /dev/null
+++ b/offer_backend/apps/accounts/permissions.py
@@ -0,0 +1,23 @@
+from rest_framework.permissions import BasePermission
+
+
+class IsSuperAdmin(BasePermission):
+    def has_permission(self, request, view):
+        return request.user.is_authenticated and request.user.is_superadmin
+
+
+class IsCompanyAdmin(BasePermission):
+    def has_permission(self, request, view):
+        return request.user.is_authenticated and request.user.is_admin
+
+
+class IsAdminOrSuperAdmin(BasePermission):
+    def has_permission(self, request, view):
+        return request.user.is_authenticated and (
+            request.user.is_admin or request.user.is_superadmin
+        )
+
+
+class IsSeeker(BasePermission):
+    def has_permission(self, request, view):
+        return request.user.is_authenticated and request.user.is_seeker
diff --git a/offer_backend/apps/accounts/serializers.py b/offer_backend/apps/accounts/serializers.py
new file mode 100644
index 0000000..96620f0
--- /dev/null
+++ b/offer_backend/apps/accounts/serializers.py
@@ -0,0 +1,38 @@
+from rest_framework import serializers
+from django.contrib.auth import get_user_model
+
+User = get_user_model()
+
+
+class RegisterSerializer(serializers.ModelSerializer):
+    password = serializers.CharField(write_only=True, min_length=6)
+
+    class Meta:
+        model = User
+        fields = ['username', 'email', 'phone', 'password']
+
+    def create(self, validated_data):
+        return User.objects.create_user(**validated_data, role='seeker')
+
+
+class UserSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = User
+        fields = ['id', 'username', 'email', 'phone', 'role', 'organization']
+        read_only_fields = ['role']
+
+
+class AdminUserSerializer(serializers.ModelSerializer):
+    """超管用于创建/管理公司管理员账号"""
+    password = serializers.CharField(write_only=True, min_length=6)
+
+    class Meta:
+        model = User
+        fields = ['id', 'username', 'email', 'phone', 'role', 'organization', 'password', 'is_active']
+
+    def create(self, validated_data):
+        password = validated_data.pop('password')
+        user = User(**validated_data)
+        user.set_password(password)
+        user.save()
+        return user
diff --git a/offer_backend/apps/accounts/tests/__init__.py b/offer_backend/apps/accounts/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/accounts/tests/test_auth.py b/offer_backend/apps/accounts/tests/test_auth.py
new file mode 100644
index 0000000..8692f73
--- /dev/null
+++ b/offer_backend/apps/accounts/tests/test_auth.py
@@ -0,0 +1,27 @@
+import pytest
+from django.contrib.auth import get_user_model
+
+User = get_user_model()
+
+
+@pytest.mark.django_db
+class TestUserModel:
+    def test_create_seeker(self):
+        user = User.objects.create_user(
+            username='seeker1', password='pass123', role='seeker'
+        )
+        assert user.role == 'seeker'
+        assert user.is_seeker is True
+        assert user.is_admin is False
+
+    def test_create_admin(self):
+        user = User.objects.create_user(
+            username='admin1', password='pass123', role='admin'
+        )
+        assert user.is_admin is True
+
+    def test_create_superadmin(self):
+        user = User.objects.create_user(
+            username='super1', password='pass123', role='superadmin'
+        )
+        assert user.is_superadmin is True
diff --git a/offer_backend/apps/accounts/urls.py b/offer_backend/apps/accounts/urls.py
new file mode 100644
index 0000000..28c4ef6
--- /dev/null
+++ b/offer_backend/apps/accounts/urls.py
@@ -0,0 +1,12 @@
+from django.urls import path
+from rest_framework_simplejwt.views import TokenObtainPairView, TokenRefreshView
+from .views import RegisterView, MeView, UserManageViewSet, UserDetailView
+
+urlpatterns = [
+    path('register/', RegisterView.as_view()),
+    path('login/', TokenObtainPairView.as_view()),
+    path('token/refresh/', TokenRefreshView.as_view()),
+    path('me/', MeView.as_view()),
+    path('users/', UserManageViewSet.as_view()),
+    path('users/<int:pk>/', UserDetailView.as_view()),
+]
diff --git a/offer_backend/apps/accounts/views.py b/offer_backend/apps/accounts/views.py
new file mode 100644
index 0000000..86da59b
--- /dev/null
+++ b/offer_backend/apps/accounts/views.py
@@ -0,0 +1,40 @@
+from rest_framework import generics
+from rest_framework.permissions import AllowAny, IsAuthenticated
+from rest_framework.response import Response
+from rest_framework.views import APIView
+from django.contrib.auth import get_user_model
+from .serializers import RegisterSerializer, UserSerializer, AdminUserSerializer
+from .permissions import IsSuperAdmin
+
+User = get_user_model()
+
+
+class RegisterView(generics.CreateAPIView):
+    serializer_class = RegisterSerializer
+    permission_classes = [AllowAny]
+
+
+class MeView(APIView):
+    permission_classes = [IsAuthenticated]
+
+    def get(self, request):
+        return Response(UserSerializer(request.user).data)
+
+    def patch(self, request):
+        serializer = UserSerializer(request.user, data=request.data, partial=True)
+        serializer.is_valid(raise_exception=True)
+        serializer.save()
+        return Response(serializer.data)
+
+
+class UserManageViewSet(generics.ListCreateAPIView):
+    """超管：管理所有用户"""
+    serializer_class = AdminUserSerializer
+    permission_classes = [IsSuperAdmin]
+    queryset = User.objects.all()
+
+
+class UserDetailView(generics.RetrieveUpdateDestroyAPIView):
+    serializer_class = AdminUserSerializer
+    permission_classes = [IsSuperAdmin]
+    queryset = User.objects.all()
diff --git a/offer_backend/apps/applications/__init__.py b/offer_backend/apps/applications/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/applications/apps.py b/offer_backend/apps/applications/apps.py
new file mode 100644
index 0000000..eb5cd54
--- /dev/null
+++ b/offer_backend/apps/applications/apps.py
@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+class ApplicationsConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.applications'
diff --git a/offer_backend/apps/applications/urls.py b/offer_backend/apps/applications/urls.py
new file mode 100644
index 0000000..e39cb2c
--- /dev/null
+++ b/offer_backend/apps/applications/urls.py
@@ -0,0 +1,3 @@
+from django.urls import path
+
+urlpatterns = []
diff --git a/offer_backend/apps/jobs/__init__.py b/offer_backend/apps/jobs/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/jobs/apps.py b/offer_backend/apps/jobs/apps.py
new file mode 100644
index 0000000..fc7583a
--- /dev/null
+++ b/offer_backend/apps/jobs/apps.py
@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+class JobsConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.jobs'
diff --git a/offer_backend/apps/jobs/urls.py b/offer_backend/apps/jobs/urls.py
new file mode 100644
index 0000000..e39cb2c
--- /dev/null
+++ b/offer_backend/apps/jobs/urls.py
@@ -0,0 +1,3 @@
+from django.urls import path
+
+urlpatterns = []
diff --git a/offer_backend/apps/organizations/__init__.py b/offer_backend/apps/organizations/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/organizations/apps.py b/offer_backend/apps/organizations/apps.py
new file mode 100644
index 0000000..b85c06d
--- /dev/null
+++ b/offer_backend/apps/organizations/apps.py
@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+class OrganizationsConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.organizations'
diff --git a/offer_backend/apps/organizations/models.py b/offer_backend/apps/organizations/models.py
new file mode 100644
index 0000000..f54646a
--- /dev/null
+++ b/offer_backend/apps/organizations/models.py
@@ -0,0 +1,13 @@
+from django.db import models
+
+
+class Organization(models.Model):
+    name = models.CharField(max_length=255)
+
+    class Meta:
+        app_label = 'organizations'
+        verbose_name = '组织'
+        verbose_name_plural = '组织'
+
+    def __str__(self):
+        return self.name
diff --git a/offer_backend/apps/organizations/urls.py b/offer_backend/apps/organizations/urls.py
new file mode 100644
index 0000000..e39cb2c
--- /dev/null
+++ b/offer_backend/apps/organizations/urls.py
@@ -0,0 +1,3 @@
+from django.urls import path
+
+urlpatterns = []
diff --git a/offer_backend/apps/resumes/__init__.py b/offer_backend/apps/resumes/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/offer_backend/apps/resumes/apps.py b/offer_backend/apps/resumes/apps.py
new file mode 100644
index 0000000..910b4e2
--- /dev/null
+++ b/offer_backend/apps/resumes/apps.py
@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+class ResumesConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.resumes'
diff --git a/offer_backend/apps/resumes/urls.py b/offer_backend/apps/resumes/urls.py
new file mode 100644
index 0000000..e39cb2c
--- /dev/null
+++ b/offer_backend/apps/resumes/urls.py
@@ -0,0 +1,3 @@
+from django.urls import path
+
+urlpatterns = []