diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..1f5b97c
--- /dev/null
+++ b/app/__init__.py
@@ -0,0 +1,47 @@
+from flask import Flask
+from flask_login import LoginManager
+import os
+import json
+
+from .models import initialize_db, User
+from .utils.auth import ensure_default_admin, ensure_test_users
+
+login_manager = LoginManager()
+
+
+def create_app():
+    app = Flask(__name__)
+    app.secret_key = os.environ.get('FLASK_SECRET', 'sk_f098a9f7206d40f89bc2a0dd1d2d9182')
+    app.jinja_env.filters['from_json'] = json.loads
+
+    # DB init and seeds
+    initialize_db()
+    if os.environ.get('SEED_ADMIN_DISABLED') != '1':
+        ensure_default_admin()
+    if os.environ.get('SEED_TEST_USERS_DISABLED') != '1':
+        ensure_test_users()
+
+    # Login manager
+    login_manager.init_app(app)
+    login_manager.login_view = 'login'
+
+    @login_manager.user_loader
+    def load_user(user_id):
+        try:
+            return User.get_by_id(int(user_id))
+        except Exception:
+            return None
+
+    # Register blueprints
+    from .blueprints.auth import bp as auth_bp
+    from .blueprints.admin_users import bp as admin_users_bp
+    from .blueprints.core import bp as core_bp
+    from .blueprints.invite import bp as invite_bp
+
+    app.register_blueprint(auth_bp)
+    app.register_blueprint(core_bp)
+    app.register_blueprint(invite_bp)
+    app.register_blueprint(admin_users_bp)
+
+    return app
+
diff --git a/app/blueprints/admin_users.py b/app/blueprints/admin_users.py
new file mode 100644
index 0000000..6184674
--- /dev/null
+++ b/app/blueprints/admin_users.py
@@ -0,0 +1,91 @@
+from flask import Blueprint, render_template, request, redirect, url_for, flash
+from werkzeug.security import generate_password_hash
+from app.models import User
+from app.utils.auth import admin_required
+
+bp = Blueprint('admin_users', __name__)
+
+
+@bp.route('/admin/users', methods=['GET', 'POST'], endpoint='manage_users')
+@admin_required
+def manage_users():
+    if request.method == 'POST':
+        username = request.form['username'].strip()
+        email = request.form['email'].strip()
+        full_name = request.form.get('full_name', '').strip()
+        password = request.form['password']
+        is_admin_flag = request.form.get('is_admin') == 'on'
+
+        if not username, or not email or not password:
+            flash('Заполните обязательные поля', 'danger')
+            return redirect(url_for('manage_users'))
+        if User.select().where((User.username == username) | (User.email == email)).exists():
+            flash('Пользователь с таким логином или email уже существует', 'danger')
+            return redirect(url_for('manage_users'))
+
+        User.create(
+            username=username,
+            email=email,
+            full_name=full_name or None,
+            password_hash=generate_password_hash(password),
+            is_admin=is_admin_flag,
+        )
+        flash('Пользователь создан', 'success')
+        return redirect(url_for('manage_users'))
+
+    users = User.select().order_by(User.id)
+    return render_template('admin/users.html', users=users, title='Пользователи')
+
+
+@bp.route('/admin/users/<int:user_id>/reset_password', methods=['POST'], endpoint='admin_reset_password')
+@admin_required
+def admin_reset_password(user_id):
+    user = User.get_or_none(User.id == user_id)
+    if not user:
+        flash('Пользователь не найден', 'danger')
+        return redirect(url_for('manage_users'))
+    new_password = request.form.get('new_password')
+    if not new_password:
+        flash('Укажите новый пароль', 'danger')
+        return redirect(url_for('manage_users'))
+    user.password_hash = generate_password_hash(new_password)
+    user.save()
+    flash('Пароль обновлён', 'success')
+    return redirect(url_for('manage_users'))
+
+
+@bp.route('/admin/users/<int:user_id>/toggle_admin', methods=['POST'], endpoint='admin_toggle_admin')
+@admin_required
+def admin_toggle_admin(user_id):
+    from flask_login import current_user
+    if current_user.id == user_id:
+        flash('Нельзя менять свои собственные права', 'warning')
+        return redirect(url_for('manage_users'))
+    user = User.get_or_none(User.id == user_id)
+    if not user:
+        flash('Пользователь не найден', 'danger')
+        return redirect(url_for('manage_users'))
+    user.is_admin = not user.is_admin
+    user.save()
+    flash('Права обновлены', 'success')
+    return redirect(url_for('manage_users'))
+
+
+@bp.route('/admin/users/<int:user_id>/delete', methods=['POST'], endpoint='admin_delete_user')
+@admin_required
+def admin_delete_user(user_id):
+    from flask_login import current_user
+    if current_user.id == user_id:
+        flash('Нельзя удалить самого себя', 'warning')
+        return redirect(url_for('manage_users'))
+    user = User.get_or_none(User.id == user_id)
+    if not user:
+        flash('Пользователь не найден', 'danger')
+        return redirect(url_for('manage_users'))
+    try:
+        user.delete_instance(recursive=True)
+        flash('Пользователь удалён', 'success')
+    except Exception:
+        flash('Не удалось удалить пользователя', 'danger')
+    return redirect(url_for('manage_users'))
+
diff --git a/app/blueprints/auth.py b/app/blueprints/auth.py
new file mode 100644
index 0000000..606c069
--- /dev/null
+++ b/app/blueprints/auth.py
@@ -0,0 +1,29 @@
+from flask import Blueprint, render_template, request, redirect, url_for, flash
+from flask_login import login_user, logout_user
+from werkzeug.security import check_password_hash
+
+from app.models import User
+
+bp = Blueprint('auth', __name__)
+
+
+@bp.route('/login', methods=['GET', 'POST'], endpoint='login')
+def login():
+    if request.method == 'POST':
+        username = request.form['username']
+        password = request.form['password']
+        user = User.get_or_none(User.username == username)
+
+        if user and check_password_hash(user.password_hash, password):
+            login_user(user)
+            return redirect(url_for('dashboard' if not user.is_admin else 'manage_surveys'))
+        else:
+            flash('Неверный логин или пароль', 'danger')
+    return render_template('login.html', title='Вход')
+
+
+@bp.route('/logout', endpoint='logout')
+def logout():
+    logout_user()
+    return redirect(url_for('choose_survey'))
+
diff --git a/app/blueprints/core.py b/app/blueprints/core.py
new file mode 100644
index 0000000..0ec3b55
--- /dev/null
+++ b/app/blueprints/core.py
@@ -0,0 +1,54 @@
+from flask import Blueprint, render_template, redirect, url_for
+from flask_login import login_required, current_user
+from app.models import SurveyInvite, UserSurvey, SurveyType, User
+
+bp = Blueprint('core', __name__)
+
+
+@bp.route('/', endpoint='home')
+def home():
+    return redirect(url_for('choose_survey'))
+
+
+@bp.route('/dashboard', endpoint='dashboard')
+@login_required
+def dashboard():
+    if current_user.is_admin:
+        invites = (SurveyInvite
+                   .select()
+                   .join(UserSurvey)
+                   .order_by(SurveyInvite.sent_at.desc()))
+    else:
+        invites = (SurveyInvite
+                   .select()
+                   .join(UserSurvey)
+                   .where(UserSurvey.user == current_user.id)
+                   .order_by(SurveyInvite.sent_at.desc()))
+    return render_template('user/dashboard.html', invites=invites, title='Отчёты')
+
+
+@bp.route('/quiz', endpoint='choose_survey')
+@login_required
+def choose_survey():
+    if current_user.is_admin:
+        surveys = SurveyType.select()
+        users = User.select().where(User.is_admin == False)
+        assignments = {
+            s.id: [us.user.id for us in UserSurvey.select().where(UserSurvey.survey_type == s)]
+            for s in surveys
+        }
+    else:
+        surveys = (SurveyType
+                   .select()
+                   .join(UserSurvey)
+                   .where(UserSurvey.user == current_user.id)
+                   .distinct())
+        users = []
+        assignments = {}
+
+    return render_template('choose_survey.html',
+                           surveys=surveys,
+                           users=users,
+                           assignments=assignments,
+                           title='Опросы')
+
diff --git a/app/blueprints/invite.py b/app/blueprints/invite.py
new file mode 100644
index 0000000..646b38c
--- /dev/null
+++ b/app/blueprints/invite.py
@@ -0,0 +1,90 @@
+from flask import Blueprint, render_template, request, redirect, url_for, flash
+import datetime
+import json
+from app.models import SurveyInvite, Product, Feature, Platform, PlatformFeature, UserSurvey, SurveyType
+from app.utils.mail import send_result_email
+
+bp = Blueprint('invite', __name__)
+
+
+@bp.route('/invite/<uuid_str>', methods=['GET', 'POST'], endpoint='handle_invite')
+def handle_invite(uuid_str):
+    invite = SurveyInvite.get_or_none(SurveyInvite.uuid == uuid_str)
+    if not invite:
+        return "Ссылка недействительна", 404
+
+    user_survey = invite.survey
+    survey_type = user_survey.survey_type
+    products = Product.select().where(Product.survey_type == survey_type)
+
+    if request.method == 'GET':
+        questions = {}
+        for product in products:
+            features = Feature.select().where(Feature.product == product)
+            questions[product.name] = {f.name: f.question_text for f in features}
+        return render_template("invite/form.html", invite=invite, survey=user_survey, questions=questions)
+
+    full_name = request.form.get('full_name')
+    phone = request.form.get('phone')
+    organization = request.form.get('organization')
+    answers = dict(request.form)
+    for k in ['full_name', 'phone', 'organization']:
+        answers.pop(k, None)
+    selected_keys = list(answers.keys())
+
+    platforms = Platform.select().where(Platform.survey_type == survey_type)
+    features = Feature.select().join(Product).where(
+        Feature.name.in_(selected_keys),
+        Product.survey_type == survey_type
+    )
+    comment = request.form.get('comment')
+    scores = {}
+    unsupported = {}
+    total = len(selected_keys)
+
+    for platform in platforms:
+        match = 0
+        unsup = []
+        for feature in features:
+            pf = PlatformFeature.get_or_none(platform=platform, feature=feature)
+            if pf and pf.supported:
+                match += 1
+            else:
+                unsup.append(feature.question_text)
+        scores[platform.name] = round((match / total) * 100) if total else 0
+        unsupported[platform.name] = unsup
+
+    SurveyResult = __import__('app.models', fromlist=['SurveyResult']).SurveyResult
+    SurveyResult.create(
+        invite=invite,
+        full_name=full_name,
+        phone=phone,
+        organization=organization,
+        answers=json.dumps(answers),
+        platform_scores=json.dumps(scores),
+        unsupported=json.dumps(unsupported),
+        submitted_at=datetime.datetime.now(),
+        comment=comment
+    )
+
+    invite.responded = True
+    invite.save()
+
+    send_result_email(
+        to_email=invite.survey.user.email,
+        from_email=invite.recipient_email,
+        survey_name=survey_type.name,
+        scores=scores,
+        unsupported=unsupported,
+        sender_name=invite.survey.user.full_name
+    )
+
+    if not invite.show_result:
+        flash("Спасибо! Ваши ответы отправлены.", "success")
+        return redirect("https://www.mont.ru/ru-ru")
+
+    return render_template("invite/result.html",
+                           scores=scores,
+                           unsupported_features=unsupported,
+                           chart_labels=list(scores.keys()),
+                           chart_data=list(scores.values()))
diff --git a/app/models.py b/app/models.py
new file mode 100644
index 0000000..3a5c663
--- /dev/null
+++ b/app/models.py
@@ -0,0 +1,117 @@
+from peewee import *
+from flask_login import UserMixin
+import os
+import datetime
+import uuid
+
+USE_SQLITE = os.environ.get("USE_SQLITE") == "1"
+
+if USE_SQLITE:
+    db = SqliteDatabase(os.environ.get("SQLITE_PATH", "survey.db"))
+else:
+    db = PostgresqlDatabase(
+        os.environ.get("POSTGRES_DB", "survey"),
+        user=os.environ.get("POSTGRES_USER", "servey"),
+        password=os.environ.get("POSTGRES_PASSWORD", "utOgbZ09servey"),
+        host=os.environ.get("POSTGRES_HOST", "db"),
+        port=int(os.environ.get("POSTGRES_PORT", 5432))
+    )
+
+
+class BaseModel(Model):
+    class Meta:
+        database = db
+
+
+class User(BaseModel, UserMixin):
+    username = CharField(unique=True)
+    email = CharField(unique=True)
+    password_hash = CharField()
+    full_name = CharField(null=True)
+    is_admin = BooleanField(default=False)
+
+    def get_id(self):
+        return str(self.id)
+
+    @property
+    def is_active(self):
+        return True
+
+
+class SurveyType(BaseModel):
+    name = CharField(unique=True)
+
+
+class Product(BaseModel):
+    name = CharField()
+    survey_type = ForeignKeyField(SurveyType, backref='products', on_delete='CASCADE')
+
+
+class Feature(BaseModel):
+    question_text = TextField()
+    product = ForeignKeyField(Product, backref='features', on_delete='CASCADE')
+
+
+class Platform(BaseModel):
+    name = CharField(unique=True)
+    survey_type = ForeignKeyField(SurveyType, backref='platforms', on_delete='CASCADE')
+
+
+class PlatformFeature(BaseModel):
+    platform = ForeignKeyField(Platform, backref='features', on_delete='CASCADE')
+    feature = ForeignKeyField(Feature, backref='platforms', on_delete='CASCADE')
+    supported = BooleanField(default=True)
+
+
+class UserSurvey(BaseModel):
+    user = ForeignKeyField(User, backref='surveys', on_delete='CASCADE')
+    survey_type = ForeignKeyField(SurveyType, on_delete='CASCADE')
+    name = CharField()
+    created_at = DateTimeField(default=datetime.datetime.now)
+
+
+class SurveyInvite(BaseModel):
+    survey = ForeignKeyField(UserSurvey, backref='invites', on_delete='CASCADE')
+    recipient_email = CharField()
+    uuid = UUIDField(default=uuid.uuid4, unique=True)
+    show_result = BooleanField(default=False)
+    ask_full_name = BooleanField(default=False)
+    ask_phone = BooleanField(default=False)
+    ask_organization = BooleanField(default=False)
+    sent_at = DateTimeField(default=datetime.datetime.now)
+    responded = BooleanField(default=False)
+
+
+class SurveyResult(BaseModel):
+    invite = ForeignKeyField(SurveyInvite, backref='result')
+    full_name = CharField(null=True)
+    phone = CharField(null=True)
+    organization = CharField(null=True)
+    answers = TextField(null=True)
+    platform_scores = TextField(null=True)
+    unsupported = TextField(null=True)
+    submitted_at = DateTimeField(default=datetime.datetime.now, null=False)
+    comment = TextField(null=True)
+
+
+def initialize_db():
+    try:
+        db.connect()
+    except Exception:
+        if not USE_SQLITE:
+            sqlite_db = SqliteDatabase(os.environ.get("SQLITE_PATH", "survey.db"))
+            sqlite_db.bind([
+                User, SurveyType, Product, Feature, Platform, PlatformFeature,
+                UserSurvey, SurveyInvite, SurveyResult
+            ], bind_refs=False, bind_backrefs=False)
+            globals()['db'] = sqlite_db
+            sqlite_db.connect()
+        else:
+            raise
+
+    db.create_tables([
+        User, SurveyType, Product, Feature, Platform, PlatformFeature,
+        UserSurvey, SurveyInvite, SurveyResult
+    ], safe=True)
+    db.close()
+
diff --git a/app/utils/auth.py b/app/utils/auth.py
new file mode 100644
index 0000000..f6c8732
--- /dev/null
+++ b/app/utils/auth.py
@@ -0,0 +1,67 @@
+from flask import redirect, url_for, flash
+from flask_login import current_user
+from functools import wraps
+from werkzeug.security import generate_password_hash, check_password_hash
+import os
+
+from app.models import User
+
+
+def admin_required(f):
+    @wraps(f)
+    def decorated(*args, **kwargs):
+        if not current_user.is_authenticated:
+            return redirect(url_for('login'))
+        if not getattr(current_user, 'is_admin', False):
+            flash('Недостаточно прав', 'danger')
+            return redirect(url_for('dashboard'))
+        return f(*args, **kwargs)
+    return decorated
+
+
+def ensure_default_admin():
+    username = os.environ.get('ADMIN_USERNAME', 'ruslan')
+    password = os.environ.get('ADMIN_PASSWORD', '1234')
+    email = os.environ.get('ADMIN_EMAIL', 'ruslan@example.com')
+
+    user = User.get_or_none(User.username == username)
+    if user:
+        changed = False
+        if not user.is_admin:
+            user.is_admin = True
+            changed = True
+        try:
+            if not check_password_hash(user.password_hash, password):
+                user.password_hash = generate_password_hash(password)
+                changed = True
+        except Exception:
+            user.password_hash = generate_password_hash(password)
+            changed = True
+        if changed:
+            user.save()
+    else:
+        User.create(
+            username=username,
+            email=email,
+            full_name='Администратор',
+            password_hash=generate_password_hash(password),
+            is_admin=True
+        )
+
+
+def ensure_test_users():
+    tests = [
+        ('test1', 'test1@example.com', 'Пользователь 1'),
+        ('test2', 'test2@example.com', 'Пользователь 2'),
+    ]
+    for username, email, full_name in tests:
+        u = User.get_or_none(User.username == username)
+        if not u:
+            User.create(
+                username=username,
+                email=email,
+                full_name=full_name,
+                password_hash=generate_password_hash(os.environ.get('TEST_USER_PASSWORD', '1234')),
+                is_admin=False,
+            )
+
diff --git a/app/utils/mail.py b/app/utils/mail.py
new file mode 100644
index 0000000..f5c8763
--- /dev/null
+++ b/app/utils/mail.py
@@ -0,0 +1,64 @@
+import smtplib
+from email.mime.multipart import MIMEMultipart
+from email.mime.text import MIMEText
+
+
+def send_invite_email(to_email, link, sender_name, survey_name):
+    msg = MIMEMultipart("alternative")
+    msg['Subject'] = f"Приглашение пройти опрос: {survey_name}"
+    msg['From'] = "quiz@4mont.ru"
+    msg['To'] = to_email
+
+    plain_text = f"Опрос: {survey_name}\nОтправитель: {sender_name}\n\nСсылка: {link}\n"
+    html = f"""
+    <html>
+      <body style="font-family: sans-serif;">
+        <h3>Приглашение пройти опрос</h3>
+        <p><strong>Опрос:</strong> {survey_name}<br>
+           <strong>Отправитель:</strong> {sender_name}</p>
+        <p><a href="{link}" style="font-size: 16px; font-weight: bold;">Перейти к опросу</a></p>
+      </body>
+    </html>
+    """
+
+    msg.attach(MIMEText(plain_text, "plain"))
+    msg.attach(MIMEText(html, "html"))
+
+    with smtplib.SMTP("mail.hosting.reg.ru", 587) as server:
+        server.starttls()
+        server.login("quiz@4mont.ru", "utOgbZ09quizpochta")
+        server.send_message(msg)
+
+
+def send_result_email(to_email, from_email, survey_name, scores, unsupported, sender_name):
+    report_link = "https://quiz.4mont.ru/dashboard"
+    plain_text = (
+        f"Результаты опроса\nОтправитель: {sender_name} ({from_email})\n"
+        f"Опрос: {survey_name}\n\n" +
+        "\n".join(f"{p}: {v}%" for p, v in scores.items()) +
+        "\n\nПодробности: " + report_link
+    )
+    html = f"""
+    <html>
+      <body style="font-family: sans-serif;">
+        <h3>Результаты опроса: {survey_name}</h3>
+        <ul>
+        {''.join(f'<li><strong>{p}:</strong> {v}%</li>' for p, v in scores.items())}
+        </ul>
+        <p><a href="{report_link}" style="font-weight: bold;">Открыть отчеты</a></p>
+      </body>
+    </html>
+    """
+
+    msg = MIMEMultipart("alternative")
+    msg['Subject'] = f"Результаты опроса: {survey_name}"
+    msg['From'] = "quiz@4mont.ru"
+    msg['To'] = to_email
+    msg.attach(MIMEText(plain_text, "plain"))
+    msg.attach(MIMEText(html, "html"))
+
+    with smtplib.SMTP("mail.hosting.reg.ru", 587) as server:
+        server.starttls()
+        server.login("quiz@4mont.ru", "utOgbZ09quizpochta")
+        server.send_message(msg)
+
diff --git a/wsgi.py b/wsgi.py
new file mode 100644
index 0000000..ae4d675
--- /dev/null
+++ b/wsgi.py
@@ -0,0 +1,7 @@
+from app import create_app
+
+app = create_app()
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', debug=True)
+