diff --git a/DailyGoals.drawio b/DailyGoals.drawio
index ca3101c..b0937cb 100644
--- a/DailyGoals.drawio
+++ b/DailyGoals.drawio
@@ -37,6 +37,12 @@
         <mxCell id="UlVOh7WOaItsqOB8hf6W-9" parent="1" style="whiteSpace=wrap;html=1;aspect=fixed;" value="Node" vertex="1">
           <mxGeometry height="80" width="80" x="400" y="60" as="geometry" />
         </mxCell>
+        <mxCell id="UlVOh7WOaItsqOB8hf6W-19" edge="1" parent="1" source="UlVOh7WOaItsqOB8hf6W-17" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0;entryY=0.5;entryDx=0;entryDy=0;" target="UlVOh7WOaItsqOB8hf6W-1">
+          <mxGeometry relative="1" as="geometry" />
+        </mxCell>
+        <mxCell id="UlVOh7WOaItsqOB8hf6W-17" parent="1" style="whiteSpace=wrap;html=1;aspect=fixed;" value="Session" vertex="1">
+          <mxGeometry height="80" width="80" x="130" y="290" as="geometry" />
+        </mxCell>
       </root>
     </mxGraphModel>
   </diagram>
diff --git a/ai/backend_prompt_template.md b/ai/backend_prompt_template.md
index 1aa846d..c16ef26 100644
--- a/ai/backend_prompt_template.md
+++ b/ai/backend_prompt_template.md
@@ -20,29 +20,41 @@ Code patterns to follow:
 - Entities: constructor with properties, getters
 - DTOs: simple data containers for creation
 - Repositories: interfaces that define data access
+  - Do not write unit tests for concrete repository implementations
+    (e.g., Doctrine/persistence-backed). They are exercised by e2e
+    tests. Use cases are tested with fake repositories.
 - Use cases: business logic with Request objects
   - When throwing exceptions, add @throws docblock
 - Fakes: in-memory implementations for testing
   - Look at tests/Fakes/ for examples
   - Find/lookup methods must return a new instance of the entity, not the stored reference
 - Tests: follow existing patterns in tests/Unit/[Entity]/UseCases/
-  - In setUp, only use fake repositories for entities under test — construct dependency objects directly with `new` (e.g., `new Text(....)`) instead of creating them through their fake repositories
-- Lines should not exceed 80 columns, but should use up to 80 columns when possible — do not split lines unnecessarily
+  - In setUp, only use fake repositories for entities under test - construct dependency objects directly with `new` (e.g., `new Text(....)`) instead of creating them through their fake repositories
+- Lines should not exceed 80 columns, but should use up to 80 columns when possible - do not split lines unnecessarily
 - Imports: always put use statements at the top of the file, never use inline imports (e.g., \App\Foo\Bar::class)
-- Variable names: use explicit, descriptive names — never single-letter or abbreviated variables (e.g., use $sponsorship not $s, $event not $e)
+- Variable names: use explicit, descriptive names - never single-letter or abbreviated variables (e.g., use $sponsorship not $s, $event not $e)
+- Never use em-dashes (—) in code, comments, commit messages, or any
+  written output. Use a regular hyphen (-), a colon, or rephrase
+  with parentheses instead.
 
 Git commit style:
-- Present tense, imperative mood (add, create, test, fix)
-- Lowercase
-- Short (3-6 words)
-- Match patterns found in git history
+- Subject: present tense, imperative mood (add, create, test, fix)
+- Subject: lowercase, short (3-6 words)
+- Match subject patterns found in git history
+- Add a body when the change needs explanation beyond the subject -
+  e.g., why the change was made, non-obvious tradeoffs, or notable
+  implementation details. Skip the body for trivial/self-evident commits.
+- Separate subject and body with a blank line; wrap body at ~72 columns
 
 Git commits:
 - Tests should be committed first, before implementation
-- One commit per file - each new file gets its own commit
-- Make commits SMALL and FREQUENT - every meaningful change should be a commit
+- Group related changes together in a single commit (e.g., a new class
+  plus its registration, or a getter plus the property it exposes).
+  Avoid mixing unrelated concerns in one commit.
+- Keep commits small and focused - prefer many small commits over few
+  large ones, but don't artificially split a single logical change
+  across multiple commits
 - Commits are for reviewing and documenting the development of code
-- A commit can be as simple as adding one import, one getter, one property, etc.
 - Don't wait to commit - commit as you go
 - Run `php-cs-fixer fix` on worked on directories before committing
 
diff --git a/ai/frontend_prompt_template.md b/ai/frontend_prompt_template.md
index 24eb7c3..a865577 100644
--- a/ai/frontend_prompt_template.md
+++ b/ai/frontend_prompt_template.md
@@ -17,22 +17,31 @@ Code patterns to follow:
 - First, explore the codebase to understand existing entity patterns
 - Look at similar pages for reference
 - Tests: follow existing patterns in cypress/e2e/
-- Lines should not exceed 80 columns, but should use up to 80 columns when possible — do not split lines unnecessarily
+- Lines should not exceed 80 columns, but should use up to 80 columns when possible - do not split lines unnecessarily
 - Imports: always put imports at the top of the file
-- Variable names: use explicit, descriptive names — never single-letter or abbreviated variables (e.g., use sponsorship not s, event not e)
+- Variable names: use explicit, descriptive names - never single-letter or abbreviated variables (e.g., use sponsorship not s, event not e)
+- Never use em-dashes (—) in code, comments, commit messages, or any
+  written output. Use a regular hyphen (-), a colon, or rephrase
+  with parentheses instead.
 
 Git commit style:
-- Present tense, imperative mood (add, create, test, fix)
-- Lowercase
-- Short (3-6 words)
-- Match patterns found in git history
+- Subject: present tense, imperative mood (add, create, test, fix)
+- Subject: lowercase, short (3-6 words)
+- Match subject patterns found in git history
+- Add a body when the change needs explanation beyond the subject -
+  e.g., why the change was made, non-obvious tradeoffs, or notable
+  implementation details. Skip the body for trivial/self-evident commits.
+- Separate subject and body with a blank line; wrap body at ~72 columns
 
 Git commits:
 - Tests should be committed first, before implementation
-- One commit per file - each new file gets its own commit
-- Make commits SMALL and FREQUENT - every meaningful change should be a commit
+- Group related changes together in a single commit (e.g., a new class
+  plus its registration, or a getter plus the property it exposes).
+  Avoid mixing unrelated concerns in one commit.
+- Keep commits small and focused - prefer many small commits over few
+  large ones, but don't artificially split a single logical change
+  across multiple commits
 - Commits are for reviewing and documenting the development of code
-- A commit can be as simple as adding one import, one getter, one property, etc.
 - Don't wait to commit - commit as you go
 
 Branch naming:
diff --git a/app/Auth/AdminMiddleware.php b/app/Auth/AdminMiddleware.php
new file mode 100644
index 0000000..47e16be
--- /dev/null
+++ b/app/Auth/AdminMiddleware.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace App\Auth;
+
+use App\User\User;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Slim\Psr7\Response;
+
+class AdminMiddleware implements MiddlewareInterface
+{
+    public function process(
+        ServerRequestInterface $request,
+        RequestHandlerInterface $handler,
+    ): ResponseInterface {
+        $user = $request->getAttribute('user');
+
+        if (!$user instanceof User || !$user->isAdmin()) {
+            return $this->forbidden($request);
+        }
+
+        return $handler->handle($request);
+    }
+
+    private function forbidden(
+        ServerRequestInterface $request
+    ): ResponseInterface {
+        $response = new Response(403);
+
+        if ($this->wantsJson($request)) {
+            $response->getBody()->write(
+                json_encode(['error' => 'forbidden'])
+            );
+            return $response->withHeader(
+                'Content-Type',
+                'application/json'
+            );
+        }
+
+        $html = file_get_contents(
+            __DIR__ . '/../../views/templates/forbidden.php'
+        );
+        $response->getBody()->write($html);
+
+        return $response->withHeader('Content-Type', 'text/html');
+    }
+
+    private function wantsJson(ServerRequestInterface $request): bool
+    {
+        $path = $request->getUri()->getPath();
+        if (str_starts_with($path, '/api/')) {
+            return true;
+        }
+
+        $accept = $request->getHeaderLine('Accept');
+        if (str_contains($accept, 'application/json')) {
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/app/Auth/AuthController.php b/app/Auth/AuthController.php
new file mode 100644
index 0000000..0864730
--- /dev/null
+++ b/app/Auth/AuthController.php
@@ -0,0 +1,166 @@
+<?php
+
+namespace App\Auth;
+
+use App\Auth\UseCases\CreateSession;
+use App\Exceptions\BadRequestException;
+use App\Exceptions\UnauthorizedException;
+use App\User\UseCases\AuthenticateUser;
+use App\User\UseCases\AuthenticateUserRequest;
+use App\User\UseCases\CreateUser;
+use App\User\UseCases\CreateUserRequest;
+use App\User\User;
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+
+class AuthController
+{
+    private const COOKIE_MAX_AGE = 7 * 24 * 60 * 60;
+
+    public function login(
+        Request $request,
+        Response $response,
+        AuthenticateUser $authenticateUser,
+        CreateSession $createSession,
+    ): Response {
+        $data = $this->parseBody($request);
+
+        try {
+            $user = $authenticateUser->execute(
+                new AuthenticateUserRequest(
+                    email: $data['email'] ?? null,
+                    password: $data['password'] ?? null,
+                )
+            );
+        } catch (BadRequestException $exception) {
+            return $this->errorResponse(
+                $response,
+                400,
+                $exception->getMessage()
+            );
+        } catch (UnauthorizedException $exception) {
+            return $this->errorResponse(
+                $response,
+                401,
+                $exception->getMessage()
+            );
+        }
+
+        $session = $createSession->execute($user);
+
+        return $this->userResponse($response, $user)
+            ->withHeader(
+                'Set-Cookie',
+                $this->buildSetCookie($session->getToken())
+            );
+    }
+
+    public function register(
+        Request $request,
+        Response $response,
+        CreateUser $createUser,
+        CreateSession $createSession,
+    ): Response {
+        $data = $this->parseBody($request);
+
+        try {
+            $user = $createUser->execute(new CreateUserRequest(
+                email: $data['email'] ?? null,
+                password: $data['password'] ?? null,
+                isAdmin: false,
+            ));
+        } catch (BadRequestException $exception) {
+            return $this->errorResponse(
+                $response,
+                400,
+                $exception->getMessage()
+            );
+        }
+
+        $session = $createSession->execute($user);
+
+        return $this->userResponse($response, $user)
+            ->withHeader(
+                'Set-Cookie',
+                $this->buildSetCookie($session->getToken())
+            );
+    }
+
+    public function logout(
+        Request $request,
+        Response $response,
+        SessionRepository $sessionRepo,
+    ): Response {
+        $cookies = $request->getCookieParams();
+        $token = $cookies[AuthMiddleware::COOKIE_NAME] ?? null;
+
+        if ($token !== null) {
+            $sessionRepo->deleteByToken($token);
+        }
+
+        return $response->withStatus(204)
+            ->withHeader('Set-Cookie', $this->buildClearCookie());
+    }
+
+    public function me(Request $request, Response $response): Response
+    {
+        $user = $request->getAttribute('user');
+        if (!$user instanceof User) {
+            return $this->errorResponse(
+                $response,
+                401,
+                'unauthenticated'
+            );
+        }
+
+        return $this->userResponse($response, $user);
+    }
+
+    private function parseBody(Request $request): array
+    {
+        return json_decode((string) $request->getBody(), true) ?? [];
+    }
+
+    private function userResponse(Response $response, User $user): Response
+    {
+        $response->getBody()->write(json_encode([
+            'user' => [
+                'id' => $user->getId(),
+                'email' => $user->getEmail()->value(),
+                'isAdmin' => $user->isAdmin(),
+            ],
+        ]));
+
+        return $response->withHeader(
+            'Content-Type',
+            'application/json'
+        );
+    }
+
+    private function errorResponse(
+        Response $response,
+        int $status,
+        string $message,
+    ): Response {
+        $response->getBody()->write(
+            json_encode(['error' => $message])
+        );
+
+        return $response->withStatus($status)
+            ->withHeader('Content-Type', 'application/json');
+    }
+
+    private function buildSetCookie(string $token): string
+    {
+        $maxAge = self::COOKIE_MAX_AGE;
+
+        return AuthMiddleware::COOKIE_NAME . '=' . $token
+            . '; Path=/; HttpOnly; SameSite=Lax; Max-Age=' . $maxAge;
+    }
+
+    private function buildClearCookie(): string
+    {
+        return AuthMiddleware::COOKIE_NAME . '=;'
+            . ' Path=/; HttpOnly; SameSite=Lax; Max-Age=0';
+    }
+}
diff --git a/app/Auth/AuthMiddleware.php b/app/Auth/AuthMiddleware.php
new file mode 100644
index 0000000..e72fba8
--- /dev/null
+++ b/app/Auth/AuthMiddleware.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Auth;
+
+use App\User\UserRepository;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Slim\Psr7\Response;
+
+class AuthMiddleware implements MiddlewareInterface
+{
+    public const COOKIE_NAME = 'auth_token';
+
+    public function __construct(
+        private SessionRepository $sessionRepo,
+        private UserRepository $userRepo,
+        private Clock $clock,
+    ) {}
+
+    public function process(
+        ServerRequestInterface $request,
+        RequestHandlerInterface $handler,
+    ): ResponseInterface {
+        $cookies = $request->getCookieParams();
+        $token = $cookies[self::COOKIE_NAME] ?? null;
+
+        if ($token === null) {
+            return $this->unauthorized($request);
+        }
+
+        $session = $this->sessionRepo->findByToken($token);
+        if ($session === null) {
+            return $this->unauthorized($request);
+        }
+
+        if ($session->isExpired($this->clock->now())) {
+            $this->sessionRepo->deleteByToken($token);
+            return $this->unauthorized($request);
+        }
+
+        $user = $this->userRepo->find($session->getUserId());
+        if ($user === null) {
+            return $this->unauthorized($request);
+        }
+
+        return $handler->handle(
+            $request->withAttribute('user', $user)
+        );
+    }
+
+    private function unauthorized(
+        ServerRequestInterface $request
+    ): ResponseInterface {
+        if ($this->wantsJson($request)) {
+            $response = new Response(401);
+            $response->getBody()->write(
+                json_encode(['error' => 'unauthenticated'])
+            );
+            return $response->withHeader(
+                'Content-Type',
+                'application/json'
+            );
+        }
+
+        return new Response(302)->withHeader('Location', '/login');
+    }
+
+    private function wantsJson(ServerRequestInterface $request): bool
+    {
+        $path = $request->getUri()->getPath();
+        if (str_starts_with($path, '/api/')) {
+            return true;
+        }
+
+        $accept = $request->getHeaderLine('Accept');
+        if (str_contains($accept, 'application/json')) {
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/app/Auth/BcryptPasswordHasher.php b/app/Auth/BcryptPasswordHasher.php
new file mode 100644
index 0000000..8593710
--- /dev/null
+++ b/app/Auth/BcryptPasswordHasher.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Auth;
+
+class BcryptPasswordHasher implements PasswordHasher
+{
+    public function hash(string $plaintext): string
+    {
+        return password_hash($plaintext, PASSWORD_DEFAULT);
+    }
+
+    public function verify(string $plaintext, string $hash): bool
+    {
+        return password_verify($plaintext, $hash);
+    }
+}
diff --git a/app/Auth/Clock.php b/app/Auth/Clock.php
new file mode 100644
index 0000000..ad89957
--- /dev/null
+++ b/app/Auth/Clock.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Auth;
+
+use DateTimeImmutable;
+
+interface Clock
+{
+    /**
+     * Returns the current time in UTC.
+     */
+    public function now(): DateTimeImmutable;
+}
diff --git a/app/Auth/CreateSessionDto.php b/app/Auth/CreateSessionDto.php
new file mode 100644
index 0000000..d79ed76
--- /dev/null
+++ b/app/Auth/CreateSessionDto.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Auth;
+
+use DateTimeImmutable;
+
+class CreateSessionDto
+{
+    public function __construct(
+        public string $token,
+        public int $userId,
+        public DateTimeImmutable $createdAt,
+        public DateTimeImmutable $expiresAt,
+    ) {}
+}
diff --git a/app/Auth/JsonSessionRepository.php b/app/Auth/JsonSessionRepository.php
new file mode 100644
index 0000000..655b601
--- /dev/null
+++ b/app/Auth/JsonSessionRepository.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Auth;
+
+use DateTimeImmutable;
+
+class JsonSessionRepository implements SessionRepository
+{
+    private string $filePath;
+
+    public function __construct()
+    {
+        $this->filePath = __DIR__ . '/../../data/sessions.json';
+    }
+
+    public function create(CreateSessionDto $dto): Session
+    {
+        $sessions = $this->readSessions();
+
+        $sessions[] = [
+            'token' => $dto->token,
+            'userId' => $dto->userId,
+            'createdAt' => $dto->createdAt->format(DATE_ATOM),
+            'expiresAt' => $dto->expiresAt->format(DATE_ATOM),
+        ];
+        $this->writeSessions($sessions);
+
+        return new Session(
+            token: $dto->token,
+            userId: $dto->userId,
+            createdAt: $dto->createdAt,
+            expiresAt: $dto->expiresAt,
+        );
+    }
+
+    public function findByToken(string $token): ?Session
+    {
+        $sessions = $this->readSessions();
+
+        foreach ($sessions as $data) {
+            if ($data['token'] === $token) {
+                return new Session(
+                    token: $data['token'],
+                    userId: $data['userId'],
+                    createdAt: new DateTimeImmutable($data['createdAt']),
+                    expiresAt: new DateTimeImmutable($data['expiresAt']),
+                );
+            }
+        }
+
+        return null;
+    }
+
+    public function deleteByToken(string $token): void
+    {
+        $sessions = $this->readSessions();
+        $filtered = array_values(array_filter(
+            $sessions,
+            function (array $data) use ($token) {
+                return $data['token'] !== $token;
+            }
+        ));
+        $this->writeSessions($filtered);
+    }
+
+    private function readSessions(): array
+    {
+        if (!file_exists($this->filePath)) {
+            return [];
+        }
+
+        $content = file_get_contents($this->filePath);
+
+        return json_decode($content, true) ?? [];
+    }
+
+    private function writeSessions(array $sessions): void
+    {
+        file_put_contents(
+            $this->filePath,
+            json_encode($sessions, JSON_PRETTY_PRINT)
+        );
+    }
+}
diff --git a/app/Auth/PasswordHasher.php b/app/Auth/PasswordHasher.php
new file mode 100644
index 0000000..332d105
--- /dev/null
+++ b/app/Auth/PasswordHasher.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Auth;
+
+interface PasswordHasher
+{
+    public function hash(string $plaintext): string;
+
+    public function verify(string $plaintext, string $hash): bool;
+}
diff --git a/app/Auth/RandomTokenGenerator.php b/app/Auth/RandomTokenGenerator.php
new file mode 100644
index 0000000..0615bff
--- /dev/null
+++ b/app/Auth/RandomTokenGenerator.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Auth;
+
+class RandomTokenGenerator implements TokenGenerator
+{
+    public function generate(): string
+    {
+        return bin2hex(random_bytes(32));
+    }
+}
diff --git a/app/Auth/Session.php b/app/Auth/Session.php
new file mode 100644
index 0000000..82bb95d
--- /dev/null
+++ b/app/Auth/Session.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Auth;
+
+use DateTimeImmutable;
+
+class Session
+{
+    public function __construct(
+        private string $token,
+        private int $userId,
+        private DateTimeImmutable $createdAt,
+        private DateTimeImmutable $expiresAt,
+    ) {}
+
+    public function getToken(): string
+    {
+        return $this->token;
+    }
+
+    public function getUserId(): int
+    {
+        return $this->userId;
+    }
+
+    public function getCreatedAt(): DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function getExpiresAt(): DateTimeImmutable
+    {
+        return $this->expiresAt;
+    }
+
+    public function isExpired(DateTimeImmutable $now): bool
+    {
+        return $now >= $this->expiresAt;
+    }
+}
diff --git a/app/Auth/SessionRepository.php b/app/Auth/SessionRepository.php
new file mode 100644
index 0000000..073a16c
--- /dev/null
+++ b/app/Auth/SessionRepository.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Auth;
+
+interface SessionRepository
+{
+    public function create(CreateSessionDto $dto): Session;
+    public function findByToken(string $token): ?Session;
+    public function deleteByToken(string $token): void;
+}
diff --git a/app/Auth/SystemClock.php b/app/Auth/SystemClock.php
new file mode 100644
index 0000000..dd77c28
--- /dev/null
+++ b/app/Auth/SystemClock.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Auth;
+
+use DateTimeImmutable;
+use DateTimeZone;
+
+class SystemClock implements Clock
+{
+    public function now(): DateTimeImmutable
+    {
+        return new DateTimeImmutable('now', new DateTimeZone('UTC'));
+    }
+}
diff --git a/app/Auth/TokenGenerator.php b/app/Auth/TokenGenerator.php
new file mode 100644
index 0000000..39b4263
--- /dev/null
+++ b/app/Auth/TokenGenerator.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace App\Auth;
+
+interface TokenGenerator
+{
+    public function generate(): string;
+}
diff --git a/app/Auth/UseCases/CreateSession.php b/app/Auth/UseCases/CreateSession.php
new file mode 100644
index 0000000..2fa1f83
--- /dev/null
+++ b/app/Auth/UseCases/CreateSession.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Auth\UseCases;
+
+use App\Auth\Clock;
+use App\Auth\CreateSessionDto;
+use App\Auth\Session;
+use App\Auth\SessionRepository;
+use App\Auth\TokenGenerator;
+use App\User\User;
+
+class CreateSession
+{
+    private const SESSION_LIFETIME = '+7 days';
+
+    public function __construct(
+        private SessionRepository $sessionRepo,
+        private TokenGenerator $tokenGenerator,
+        private Clock $clock,
+    ) {}
+
+    public function execute(User $user): Session
+    {
+        $now = $this->clock->now();
+        $expiresAt = $now->modify(self::SESSION_LIFETIME);
+
+        return $this->sessionRepo->create(new CreateSessionDto(
+            token: $this->tokenGenerator->generate(),
+            userId: $user->getId(),
+            createdAt: $now,
+            expiresAt: $expiresAt,
+        ));
+    }
+}
diff --git a/app/Exceptions/ForbiddenException.php b/app/Exceptions/ForbiddenException.php
new file mode 100644
index 0000000..c9b05cd
--- /dev/null
+++ b/app/Exceptions/ForbiddenException.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace App\Exceptions;
+
+class ForbiddenException extends \RuntimeException {}
diff --git a/app/Exceptions/UnauthorizedException.php b/app/Exceptions/UnauthorizedException.php
new file mode 100644
index 0000000..8c3b1de
--- /dev/null
+++ b/app/Exceptions/UnauthorizedException.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace App\Exceptions;
+
+class UnauthorizedException extends \RuntimeException {}
diff --git a/app/Plan/PlanController.php b/app/Plan/PlanController.php
index cb88de8..f7aa4ec 100644
--- a/app/Plan/PlanController.php
+++ b/app/Plan/PlanController.php
@@ -5,6 +5,7 @@ namespace App\Plan;
 use App\Exceptions\BadRequestException;
 use App\Plan\UseCases\CreatePlan;
 use App\Plan\UseCases\CreatePlanRequest;
+use App\User\User;
 use DomainException;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
@@ -16,9 +17,17 @@ class PlanController
         Response $response,
         CreatePlan $createPlanUseCase,
     ): Response {
+        $user = $request->getAttribute('user');
+        if (!$user instanceof User) {
+            $response->getBody()->write(
+                json_encode(['error' => 'unauthenticated'])
+            );
+            return $response->withStatus(401)
+                ->withHeader('Content-Type', 'application/json');
+        }
+
         $data = json_decode((string) $request->getBody(), true) ?? [];
 
-        $userId = isset($data['userId']) ? (int) $data['userId'] : null;
         $textId = isset($data['textId']) ? (int) $data['textId'] : null;
         $name = $data['name'] ?? null;
         $dateStart = $data['dateStart'] ?? null;
@@ -26,7 +35,7 @@ class PlanController
 
         try {
             $plan = $createPlanUseCase->execute(new CreatePlanRequest(
-                userId: $userId,
+                userId: $user->getId(),
                 textId: $textId,
                 name: $name,
                 dateStart: $dateStart,
diff --git a/app/User/JsonUserRepository.php b/app/User/JsonUserRepository.php
index bde8c62..d5de3a2 100644
--- a/app/User/JsonUserRepository.php
+++ b/app/User/JsonUserRepository.php
@@ -21,13 +21,17 @@ class JsonUserRepository implements UserRepository
 
         $users[] = [
             'id' => $id,
-            'email' => (string) $dto->email,
+            'email' => $dto->email->value(),
+            'passwordHash' => $dto->passwordHash,
+            'isAdmin' => $dto->isAdmin,
         ];
         $this->writeUsers($users);
 
         return new User(
             id: $id,
             email: $dto->email,
+            passwordHash: $dto->passwordHash,
+            isAdmin: $dto->isAdmin,
         );
     }
 
@@ -37,16 +41,36 @@ class JsonUserRepository implements UserRepository
 
         foreach ($users as $data) {
             if ($data['id'] === $id) {
-                return new User(
-                    id: $data['id'],
-                    email: new EmailAddress($data['email']),
-                );
+                return $this->hydrate($data);
             }
         }
 
         return null;
     }
 
+    public function findByEmail(EmailAddress $email): ?User
+    {
+        $users = $this->readUsers();
+
+        foreach ($users as $data) {
+            if ($data['email'] === $email->value()) {
+                return $this->hydrate($data);
+            }
+        }
+
+        return null;
+    }
+
+    private function hydrate(array $data): User
+    {
+        return new User(
+            id: $data['id'],
+            email: new EmailAddress($data['email']),
+            passwordHash: $data['passwordHash'] ?? '',
+            isAdmin: $data['isAdmin'] ?? false,
+        );
+    }
+
     private function readUsers(): array
     {
         if (!file_exists($this->filePath)) {
diff --git a/app/User/UseCases/AuthenticateUser.php b/app/User/UseCases/AuthenticateUser.php
new file mode 100644
index 0000000..a889a06
--- /dev/null
+++ b/app/User/UseCases/AuthenticateUser.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace App\User\UseCases;
+
+use App\Auth\PasswordHasher;
+use App\Exceptions\BadRequestException;
+use App\Exceptions\UnauthorizedException;
+use App\User\User;
+use App\User\UserRepository;
+use App\ValueObjects\EmailAddress;
+
+class AuthenticateUser
+{
+    public function __construct(
+        private UserRepository $userRepo,
+        private PasswordHasher $passwordHasher,
+    ) {}
+
+    /**
+     * @throws BadRequestException
+     * @throws UnauthorizedException
+     */
+    public function execute(AuthenticateUserRequest $request): User
+    {
+        if ($request->email === null) {
+            throw new BadRequestException('email is required');
+        }
+
+        if ($request->password === null) {
+            throw new BadRequestException('password is required');
+        }
+
+        $user = $this->userRepo->findByEmail(
+            new EmailAddress($request->email)
+        );
+        if ($user === null) {
+            throw new UnauthorizedException('invalid credentials');
+        }
+
+        $passwordMatches = $this->passwordHasher->verify(
+            $request->password,
+            $user->getPasswordHash()
+        );
+        if (!$passwordMatches) {
+            throw new UnauthorizedException('invalid credentials');
+        }
+
+        return $user;
+    }
+}
diff --git a/app/User/UseCases/AuthenticateUserRequest.php b/app/User/UseCases/AuthenticateUserRequest.php
new file mode 100644
index 0000000..953ff6e
--- /dev/null
+++ b/app/User/UseCases/AuthenticateUserRequest.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\User\UseCases;
+
+class AuthenticateUserRequest
+{
+    public function __construct(
+        public ?string $email,
+        public ?string $password,
+    ) {}
+}
diff --git a/app/User/UseCases/CreateUser.php b/app/User/UseCases/CreateUser.php
index cc5ffc0..cf89fdd 100644
--- a/app/User/UseCases/CreateUser.php
+++ b/app/User/UseCases/CreateUser.php
@@ -2,7 +2,9 @@
 
 namespace App\User\UseCases;
 
+use App\Auth\PasswordHasher;
 use App\Exceptions\BadRequestException;
+use App\User\User;
 use App\User\UserRepository;
 use App\ValueObjects\EmailAddress;
 
@@ -10,19 +12,37 @@ class CreateUser
 {
     public function __construct(
         private UserRepository $userRepo,
+        private PasswordHasher $passwordHasher,
     ) {}
 
     /**
      * @throws BadRequestException
      */
-    public function execute(CreateUserRequest $dto): void
+    public function execute(CreateUserRequest $dto): User
     {
         if ($dto->email === null) {
             throw new BadRequestException('email is required');
         }
 
-        $this->userRepo->create(new CreateUserDto(
-            email: new EmailAddress($dto->email),
+        if ($dto->password === null) {
+            throw new BadRequestException('password is required');
+        }
+
+        if (strlen($dto->password) < 8) {
+            throw new BadRequestException(
+                'password must be at least 8 characters'
+            );
+        }
+
+        $email = new EmailAddress($dto->email);
+        if ($this->userRepo->findByEmail($email) !== null) {
+            throw new BadRequestException('email already taken');
+        }
+
+        return $this->userRepo->create(new CreateUserDto(
+            email: $email,
+            passwordHash: $this->passwordHasher->hash($dto->password),
+            isAdmin: $dto->isAdmin,
         ));
     }
 }
diff --git a/app/User/UseCases/CreateUserDto.php b/app/User/UseCases/CreateUserDto.php
index e978287..a9c38fa 100644
--- a/app/User/UseCases/CreateUserDto.php
+++ b/app/User/UseCases/CreateUserDto.php
@@ -8,5 +8,7 @@ class CreateUserDto
 {
     public function __construct(
         public EmailAddress $email,
+        public string $passwordHash,
+        public bool $isAdmin = false,
     ) {}
 }
diff --git a/app/User/UseCases/CreateUserRequest.php b/app/User/UseCases/CreateUserRequest.php
index 7c48913..c70ef72 100644
--- a/app/User/UseCases/CreateUserRequest.php
+++ b/app/User/UseCases/CreateUserRequest.php
@@ -6,5 +6,7 @@ class CreateUserRequest
 {
     public function __construct(
         public ?string $email,
+        public ?string $password,
+        public bool $isAdmin,
     ) {}
 }
diff --git a/app/User/User.php b/app/User/User.php
index e685a32..9e8ae97 100644
--- a/app/User/User.php
+++ b/app/User/User.php
@@ -9,6 +9,8 @@ class User
     public function __construct(
         private int $id,
         private EmailAddress $email,
+        private string $passwordHash,
+        private bool $isAdmin,
     ) {}
 
     public function getId(): int
@@ -20,4 +22,14 @@ class User
     {
         return $this->email;
     }
+
+    public function getPasswordHash(): string
+    {
+        return $this->passwordHash;
+    }
+
+    public function isAdmin(): bool
+    {
+        return $this->isAdmin;
+    }
 }
diff --git a/app/User/UserRepository.php b/app/User/UserRepository.php
index c58a649..278cd98 100644
--- a/app/User/UserRepository.php
+++ b/app/User/UserRepository.php
@@ -3,9 +3,11 @@
 namespace App\User;
 
 use App\User\UseCases\CreateUserDto;
+use App\ValueObjects\EmailAddress;
 
 interface UserRepository
 {
     public function create(CreateUserDto $dto): User;
     public function find(int $id): ?User;
+    public function findByEmail(EmailAddress $email): ?User;
 }
diff --git a/app/ValueObjects/EmailAddress.php b/app/ValueObjects/EmailAddress.php
index 6952ae9..e646f4c 100644
--- a/app/ValueObjects/EmailAddress.php
+++ b/app/ValueObjects/EmailAddress.php
@@ -11,6 +11,11 @@ class EmailAddress
         $this->normalized = $email;
     }
 
+    public function value(): string
+    {
+        return $this->normalized;
+    }
+
     public function __toString(): string
     {
         return $this->normalized;
diff --git a/app/View/ViewController.php b/app/View/ViewController.php
index c131683..4fd8d84 100644
--- a/app/View/ViewController.php
+++ b/app/View/ViewController.php
@@ -37,4 +37,24 @@ class ViewController
 
         return $response;
     }
+
+    public function login(Response $response): Response
+    {
+        $html = file_get_contents(
+            __DIR__ . '/../../views/templates/login.php'
+        );
+        $response->getBody()->write($html);
+
+        return $response;
+    }
+
+    public function register(Response $response): Response
+    {
+        $html = file_get_contents(
+            __DIR__ . '/../../views/templates/register.php'
+        );
+        $response->getBody()->write($html);
+
+        return $response;
+    }
 }
diff --git a/bootstrap/app.php b/bootstrap/app.php
index 1ceeb8e..c05dc0f 100644
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -3,6 +3,10 @@
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use DI\Bridge\Slim\Bridge;
+use Slim\Routing\RouteCollectorProxy;
+use App\Auth\AdminMiddleware;
+use App\Auth\AuthController;
+use App\Auth\AuthMiddleware;
 use App\View\ViewController;
 use App\Text\TextController;
 use App\Node\NodeController;
@@ -14,19 +18,48 @@ $app = Bridge::create($container);
 // change first param to false for production
 $app->addErrorMiddleware(true, true, true);
 
-$app->get('/home', [ViewController::class, 'home']);
-$app->get('/admin', [ViewController::class, 'admin']);
-$app->get('/admin/texts', [ViewController::class, 'texts']);
-$app->get('/admin/texts/{textId}', [ViewController::class, 'text']);
+// Public routes (no auth required)
+$app->get('/login', [ViewController::class, 'login']);
+$app->get('/register', [ViewController::class, 'register']);
+$app->post('/api/auth/login', [AuthController::class, 'login']);
+$app->post('/api/auth/register', [AuthController::class, 'register']);
 
-$app->get('/api/texts', [TextController::class, 'getTexts']);
-$app->get('/api/texts/{textId}', [TextController::class, 'getText']);
-$app->post('/api/texts', [TextController::class, 'createText']);
+// Authenticated routes (any logged-in user)
+$app->group('', function (RouteCollectorProxy $group) {
+    $group->get('/home', [ViewController::class, 'home']);
 
-$app->get('/api/nodes/{textId}', [NodeController::class, 'getNodesOfText']);
-$app->post('/api/nodes/bulk', [NodeController::class, 'bulkCreateNodes']);
-$app->post('/api/nodes', [NodeController::class, 'createNode']);
+    $group->post('/api/auth/logout', [AuthController::class, 'logout']);
+    $group->get('/api/auth/me', [AuthController::class, 'me']);
 
-$app->post('/api/plans', [PlanController::class, 'createPlan']);
+    $group->get('/api/texts', [TextController::class, 'getTexts']);
+    $group->get(
+        '/api/texts/{textId}',
+        [TextController::class, 'getText']
+    );
+
+    $group->get(
+        '/api/nodes/{textId}',
+        [NodeController::class, 'getNodesOfText']
+    );
+
+    $group->post('/api/plans', [PlanController::class, 'createPlan']);
+})->add(AuthMiddleware::class);
+
+// Admin-only routes
+$app->group('', function (RouteCollectorProxy $group) {
+    $group->get('/admin', [ViewController::class, 'admin']);
+    $group->get('/admin/texts', [ViewController::class, 'texts']);
+    $group->get(
+        '/admin/texts/{textId}',
+        [ViewController::class, 'text']
+    );
+
+    $group->post('/api/texts', [TextController::class, 'createText']);
+    $group->post(
+        '/api/nodes/bulk',
+        [NodeController::class, 'bulkCreateNodes']
+    );
+    $group->post('/api/nodes', [NodeController::class, 'createNode']);
+})->add(AdminMiddleware::class)->add(AuthMiddleware::class);
 
 return $app;
diff --git a/bootstrap/container.php b/bootstrap/container.php
index fb80996..2ae6e4c 100644
--- a/bootstrap/container.php
+++ b/bootstrap/container.php
@@ -2,6 +2,14 @@
 
 use DI;
 use DI\Container;
+use App\Auth\BcryptPasswordHasher;
+use App\Auth\Clock;
+use App\Auth\JsonSessionRepository;
+use App\Auth\PasswordHasher;
+use App\Auth\RandomTokenGenerator;
+use App\Auth\SessionRepository;
+use App\Auth\SystemClock;
+use App\Auth\TokenGenerator;
 use App\Text\TextRepository;
 use App\Text\JsonTextRepository;
 use App\Node\NodeRepository;
@@ -20,6 +28,11 @@ $container = new Container([
     UserRepository::class => DI\autowire(JsonUserRepository::class),
     ScheduledNodeRepository::class =>
         DI\autowire(JsonScheduledNodeRepository::class),
+    SessionRepository::class =>
+        DI\autowire(JsonSessionRepository::class),
+    TokenGenerator::class => DI\autowire(RandomTokenGenerator::class),
+    Clock::class => DI\autowire(SystemClock::class),
+    PasswordHasher::class => DI\autowire(BcryptPasswordHasher::class),
 ]);
 
 return $container;
diff --git a/cypress/e2e/admin.cy.js b/cypress/e2e/admin.cy.js
index 2c8054c..3bd205f 100644
--- a/cypress/e2e/admin.cy.js
+++ b/cypress/e2e/admin.cy.js
@@ -1,6 +1,7 @@
 describe('The admin page', () => {
   beforeEach(() => {
     cy.exec('npm run db:seed')
+    cy.loginAsAdmin()
     cy.visit('/admin')
   })
   afterEach(() => {
diff --git a/cypress/e2e/adminText.cy.js b/cypress/e2e/adminText.cy.js
index 84be4cd..f5cad89 100644
--- a/cypress/e2e/adminText.cy.js
+++ b/cypress/e2e/adminText.cy.js
@@ -1,6 +1,7 @@
 describe('The admin text detail page', () => {
   beforeEach(() => {
     cy.exec('npm run db:seed')
+    cy.loginAsAdmin()
     cy.intercept('GET', '/api/texts/0').as('getText')
     cy.intercept('GET', '/api/nodes/0').as('getNodes')
     cy.visit('/admin/texts/0')
diff --git a/cypress/e2e/adminTextBulkAdd.cy.js b/cypress/e2e/adminTextBulkAdd.cy.js
index 03159a2..7d1afc2 100644
--- a/cypress/e2e/adminTextBulkAdd.cy.js
+++ b/cypress/e2e/adminTextBulkAdd.cy.js
@@ -1,6 +1,7 @@
 describe('Bulk add children on the admin text detail page', () => {
   beforeEach(() => {
     cy.exec('npm run db:seed')
+    cy.loginAsAdmin()
     cy.intercept('GET', '/api/texts/0').as('getText')
     cy.intercept('GET', '/api/nodes/0').as('getNodes')
     cy.visit('/admin/texts/0')
diff --git a/cypress/e2e/adminTextToggle.cy.js b/cypress/e2e/adminTextToggle.cy.js
index c75132b..23cf830 100644
--- a/cypress/e2e/adminTextToggle.cy.js
+++ b/cypress/e2e/adminTextToggle.cy.js
@@ -1,6 +1,7 @@
 describe('Toggle display of child nodes', () => {
   beforeEach(() => {
     cy.exec('npm run db:seed')
+    cy.loginAsAdmin()
     cy.intercept('GET', '/api/texts/0').as('getText')
     cy.intercept('GET', '/api/nodes/0').as('getNodes')
     cy.visit('/admin/texts/0')
diff --git a/cypress/e2e/auth.cy.js b/cypress/e2e/auth.cy.js
new file mode 100644
index 0000000..ae22d22
--- /dev/null
+++ b/cypress/e2e/auth.cy.js
@@ -0,0 +1,87 @@
+describe('Authentication flows', () => {
+    beforeEach(() => {
+        cy.exec('npm run db:seed')
+    })
+
+    afterEach(() => {
+        cy.exec('npm run db:wipe')
+    })
+
+    it('unauthenticated home redirects to login', () => {
+        cy.visit('/home')
+        cy.url().should('include', '/login')
+    })
+
+    it('login form submits and redirects to home', () => {
+        cy.visit('/login')
+        cy.get('#email').type('user@example.com')
+        cy.get('#password').type('password1')
+        cy.get('#login-form').submit()
+        cy.url().should('include', '/home')
+        cy.get('h1').should('contain', 'Home')
+    })
+
+    it('login shows error on wrong password', () => {
+        cy.visit('/login')
+        cy.get('#email').type('user@example.com')
+        cy.get('#password').type('wrongpassword')
+        cy.get('#login-form').submit()
+        cy.get('#login-error').should('be.visible')
+        cy.url().should('include', '/login')
+    })
+
+    it('register creates user and redirects to home', () => {
+        cy.visit('/register')
+        cy.get('#email').type('fresh@example.com')
+        cy.get('#password').type('password1')
+        cy.get('#register-form').submit()
+        cy.url().should('include', '/home')
+    })
+
+    it('register shows error on short password', () => {
+        cy.visit('/register')
+        cy.get('#email').type('another@example.com')
+        cy.get('#password').invoke(
+            'removeAttr',
+            'minlength'
+        )
+        cy.get('#password').type('short')
+        cy.get('#register-form').submit()
+        cy.get('#register-error').should('be.visible')
+        cy.url().should('include', '/register')
+    })
+
+    it('register shows error on duplicate email', () => {
+        cy.visit('/register')
+        cy.get('#email').type('user@example.com')
+        cy.get('#password').type('password1')
+        cy.get('#register-form').submit()
+        cy.get('#register-error').should('be.visible')
+        cy.url().should('include', '/register')
+    })
+
+    it('logout clears session and redirects to login', () => {
+        cy.loginAsUser()
+        cy.visit('/home')
+        cy.get('#logout').click()
+        cy.url().should('include', '/login')
+        cy.visit('/home')
+        cy.url().should('include', '/login')
+    })
+
+    it('non-admin user hitting /admin gets 403', () => {
+        cy.loginAsUser()
+        cy.request({
+            url: '/admin',
+            failOnStatusCode: false,
+        }).then((response) => {
+            expect(response.status).to.eq(403)
+        })
+    })
+
+    it('admin user can access /admin', () => {
+        cy.loginAsAdmin()
+        cy.visit('/admin')
+        cy.get('#texts').should('exist')
+    })
+})
diff --git a/cypress/e2e/home.cy.js b/cypress/e2e/home.cy.js
index d0ba1fe..83c6984 100644
--- a/cypress/e2e/home.cy.js
+++ b/cypress/e2e/home.cy.js
@@ -1,6 +1,7 @@
 describe('The home page', () => {
     beforeEach(() => {
         cy.exec('npm run db:seed')
+        cy.loginAsUser()
     })
     afterEach(() => {
         cy.exec('npm run db:wipe')
diff --git a/cypress/e2e/homeCreatePlan.cy.js b/cypress/e2e/homeCreatePlan.cy.js
index 3c9ee87..8509a61 100644
--- a/cypress/e2e/homeCreatePlan.cy.js
+++ b/cypress/e2e/homeCreatePlan.cy.js
@@ -1,6 +1,7 @@
 describe('Create plan modal on the home page', () => {
     beforeEach(() => {
         cy.exec('npm run db:seed')
+        cy.loginAsUser()
         cy.intercept('GET', '/api/texts').as('getTexts')
         cy.visit('/home')
         cy.wait('@getTexts')
@@ -60,7 +61,6 @@ describe('Create plan modal on the home page', () => {
         cy.wait('@createPlan').then((createPlanRequest) => {
             expect(createPlanRequest.response.statusCode).to.eq(201)
             expect(createPlanRequest.request.body).to.deep.equal({
-                userId: 0,
                 textId: 0,
                 name: 'My reading plan',
                 dateStart: '2025-01-01',
diff --git a/cypress/support/commands.js b/cypress/support/commands.js
index 66ea16e..61e6549 100644
--- a/cypress/support/commands.js
+++ b/cypress/support/commands.js
@@ -1,25 +1,15 @@
-// ***********************************************
-// This example commands.js shows you how to
-// create various custom commands and overwrite
-// existing commands.
-//
-// For more comprehensive examples of custom
-// commands please read more here:
-// https://on.cypress.io/custom-commands
-// ***********************************************
-//
-//
-// -- This is a parent command --
-// Cypress.Commands.add('login', (email, password) => { ... })
-//
-//
-// -- This is a child command --
-// Cypress.Commands.add('drag', { prevSubject: 'element'}, (subject, options) => { ... })
-//
-//
-// -- This is a dual command --
-// Cypress.Commands.add('dismiss', { prevSubject: 'optional'}, (subject, options) => { ... })
-//
-//
-// -- This will overwrite an existing command --
-// Cypress.Commands.overwrite('visit', (originalFn, url, options) => { ... })
\ No newline at end of file
+Cypress.Commands.add('login', (email, password) => {
+    cy.request({
+        method: 'POST',
+        url: '/api/auth/login',
+        body: { email, password },
+    })
+})
+
+Cypress.Commands.add('loginAsAdmin', () => {
+    cy.login('admin@example.com', 'admin1234')
+})
+
+Cypress.Commands.add('loginAsUser', () => {
+    cy.login('user@example.com', 'password1')
+})
diff --git a/data/seedDb.php b/data/seedDb.php
index 922ca90..aaa329f 100644
--- a/data/seedDb.php
+++ b/data/seedDb.php
@@ -28,15 +28,27 @@ $nodes = [
     ],
 ];
 
+// Default credentials:
+//   admin@example.com / admin1234 (admin)
+//   user@example.com  / password1 (regular user)
 $users = [
     [
         'id' => 0,
+        'email' => 'admin@example.com',
+        'passwordHash' => password_hash('admin1234', PASSWORD_DEFAULT),
+        'isAdmin' => true,
+    ],
+    [
+        'id' => 1,
         'email' => 'user@example.com',
+        'passwordHash' => password_hash('password1', PASSWORD_DEFAULT),
+        'isAdmin' => false,
     ],
 ];
 
 $plans = [];
 $scheduledNodes = [];
+$sessions = [];
 
 $fileDataMap = [
     'texts.json' => $texts,
@@ -44,6 +56,7 @@ $fileDataMap = [
     'users.json' => $users,
     'plans.json' => $plans,
     'scheduledNodes.json' => $scheduledNodes,
+    'sessions.json' => $sessions,
 ];
 
 foreach ($fileDataMap as $file => $data) {
diff --git a/data/wipeDb.php b/data/wipeDb.php
index 658bb2f..6428a92 100644
--- a/data/wipeDb.php
+++ b/data/wipeDb.php
@@ -6,6 +6,7 @@ $files = [
     'users.json',
     'plans.json',
     'scheduledNodes.json',
+    'sessions.json',
 ];
 
 foreach ($files as $file) {
diff --git a/public/js/auth.js b/public/js/auth.js
new file mode 100644
index 0000000..0e8fc96
--- /dev/null
+++ b/public/js/auth.js
@@ -0,0 +1,75 @@
+async function submitAuthForm(endpoint, email, password, errorElement) {
+    errorElement.hidden = true;
+    errorElement.textContent = '';
+
+    const response = await fetch(endpoint, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'same-origin',
+        body: JSON.stringify({ email, password }),
+    });
+
+    if (response.ok) {
+        window.location.href = '/home';
+        return;
+    }
+
+    let message = 'Something went wrong';
+    try {
+        const body = await response.json();
+        if (body.error) {
+            message = body.error;
+        }
+    } catch (parseError) {
+        // fall through to generic message
+    }
+    errorElement.textContent = message;
+    errorElement.hidden = false;
+}
+
+async function logout() {
+    await fetch('/api/auth/logout', {
+        method: 'POST',
+        credentials: 'same-origin',
+    });
+    window.location.href = '/login';
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+    const loginForm = document.getElementById('login-form');
+    if (loginForm !== null) {
+        const errorElement = document.getElementById('login-error');
+        loginForm.addEventListener('submit', async (submitEvent) => {
+            submitEvent.preventDefault();
+            const email = document.getElementById('email').value;
+            const password = document.getElementById('password').value;
+            await submitAuthForm(
+                '/api/auth/login',
+                email,
+                password,
+                errorElement,
+            );
+        });
+    }
+
+    const registerForm = document.getElementById('register-form');
+    if (registerForm !== null) {
+        const errorElement = document.getElementById('register-error');
+        registerForm.addEventListener('submit', async (submitEvent) => {
+            submitEvent.preventDefault();
+            const email = document.getElementById('email').value;
+            const password = document.getElementById('password').value;
+            await submitAuthForm(
+                '/api/auth/register',
+                email,
+                password,
+                errorElement,
+            );
+        });
+    }
+
+    const logoutButton = document.getElementById('logout');
+    if (logoutButton !== null) {
+        logoutButton.addEventListener('click', logout);
+    }
+});
diff --git a/public/js/home.js b/public/js/home.js
index b46a051..e7abc7c 100644
--- a/public/js/home.js
+++ b/public/js/home.js
@@ -3,7 +3,9 @@ document.addEventListener('DOMContentLoaded', () => {
     const createPlanModal = document.getElementById('create-plan-modal');
 
     async function loadTexts() {
-        const response = await fetch('/api/texts');
+        const response = await fetch('/api/texts', {
+            credentials: 'same-origin',
+        });
         const texts = await response.json();
         textsList.innerHTML = texts
             .map(text =>
@@ -67,8 +69,8 @@ document.addEventListener('DOMContentLoaded', () => {
         const response = await fetch('/api/plans', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
+            credentials: 'same-origin',
             body: JSON.stringify({
-                userId: 0,
                 textId: textId,
                 name: planName,
                 dateStart: dateStart,
diff --git a/public/js/text.js b/public/js/text.js
index 0388bf6..59fc4ee 100644
--- a/public/js/text.js
+++ b/public/js/text.js
@@ -1,7 +1,7 @@
 document.addEventListener('DOMContentLoaded', () => {
     const textId = window.location.pathname.split('/').pop();
 
-    fetch('/api/texts/' + textId)
+    fetch('/api/texts/' + textId, { credentials: 'same-origin' })
         .then(res => res.json())
         .then(text => {
             const h1 = document.createElement('h1');
@@ -13,7 +13,7 @@ document.addEventListener('DOMContentLoaded', () => {
 });
 
 function fetchAndRenderNodes(textId) {
-    return fetch('/api/nodes/' + textId)
+    return fetch('/api/nodes/' + textId, { credentials: 'same-origin' })
         .then(res => res.json())
         .then(nodes => {
             const existing = document.querySelector('#text-detail > ul');
@@ -113,6 +113,7 @@ function toggleAddForm(li, parentNodeId, textId) {
         fetch('/api/nodes', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
+            credentials: 'same-origin',
             body: JSON.stringify({ textId: parseInt(textId), title, parentNodeId }),
         })
             .then(res => {
@@ -157,6 +158,7 @@ function toggleBulkAddForm(li, parentNodeId, textId) {
         fetch('/api/nodes/bulk', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
+            credentials: 'same-origin',
             body: JSON.stringify({ textId: parseInt(textId), parentNodeId, titlePrefix, count }),
         })
             .then(res => {
diff --git a/public/js/texts.js b/public/js/texts.js
index 1937749..029196d 100644
--- a/public/js/texts.js
+++ b/public/js/texts.js
@@ -3,7 +3,9 @@ document.addEventListener('DOMContentLoaded', () => {
     const form = document.getElementById('texts-form');
 
     async function loadTexts() {
-        const res = await fetch('/api/texts');
+        const res = await fetch('/api/texts', {
+            credentials: 'same-origin',
+        });
         const texts = await res.json();
         textsList.innerHTML = texts.map(text =>
             '<li><a href=/admin/texts/'
@@ -18,6 +20,7 @@ document.addEventListener('DOMContentLoaded', () => {
         const formData = new FormData(form);
         const res = await fetch('/api/texts', {
             method: 'POST',
+            credentials: 'same-origin',
             body: formData,
         });
         if (res.ok) {
diff --git a/tests/Fakes/FakeClock.php b/tests/Fakes/FakeClock.php
new file mode 100644
index 0000000..31e649b
--- /dev/null
+++ b/tests/Fakes/FakeClock.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\Clock;
+use DateTimeImmutable;
+use InvalidArgumentException;
+
+class FakeClock implements Clock
+{
+    public function __construct(
+        private DateTimeImmutable $currentTime,
+    ) {
+        $this->assertUtc($currentTime);
+    }
+
+    public function now(): DateTimeImmutable
+    {
+        return $this->currentTime;
+    }
+
+    public function setTime(DateTimeImmutable $newTime): void
+    {
+        $this->assertUtc($newTime);
+        $this->currentTime = $newTime;
+    }
+
+    private function assertUtc(DateTimeImmutable $time): void
+    {
+        if ($time->getTimezone()->getOffset($time) !== 0) {
+            throw new InvalidArgumentException(
+                'FakeClock requires a DateTimeImmutable in UTC.'
+            );
+        }
+    }
+}
diff --git a/tests/Fakes/FakePasswordHasher.php b/tests/Fakes/FakePasswordHasher.php
new file mode 100644
index 0000000..4e9a17d
--- /dev/null
+++ b/tests/Fakes/FakePasswordHasher.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\PasswordHasher;
+
+class FakePasswordHasher implements PasswordHasher
+{
+    private const PREFIX = 'hashed:';
+
+    public function hash(string $plaintext): string
+    {
+        return self::PREFIX . $plaintext;
+    }
+
+    public function verify(string $plaintext, string $hash): bool
+    {
+        return $hash === self::PREFIX . $plaintext;
+    }
+}
diff --git a/tests/Fakes/FakeSessionRepository.php b/tests/Fakes/FakeSessionRepository.php
new file mode 100644
index 0000000..18add97
--- /dev/null
+++ b/tests/Fakes/FakeSessionRepository.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\CreateSessionDto;
+use App\Auth\Session;
+use App\Auth\SessionRepository;
+
+class FakeSessionRepository implements SessionRepository
+{
+    /**
+     * @var Session[]
+     */
+    private array $existingSessions = [];
+
+    public function create(CreateSessionDto $dto): Session
+    {
+        $session = new Session(
+            token: $dto->token,
+            userId: $dto->userId,
+            createdAt: $dto->createdAt,
+            expiresAt: $dto->expiresAt,
+        );
+        $this->existingSessions[$dto->token] = $session;
+
+        return $session;
+    }
+
+    public function findByToken(string $token): ?Session
+    {
+        $session = $this->existingSessions[$token] ?? null;
+        if ($session === null) {
+            return null;
+        }
+
+        return new Session(
+            token: $session->getToken(),
+            userId: $session->getUserId(),
+            createdAt: $session->getCreatedAt(),
+            expiresAt: $session->getExpiresAt(),
+        );
+    }
+
+    public function deleteByToken(string $token): void
+    {
+        unset($this->existingSessions[$token]);
+    }
+}
diff --git a/tests/Fakes/FakeTokenGenerator.php b/tests/Fakes/FakeTokenGenerator.php
new file mode 100644
index 0000000..fbe8913
--- /dev/null
+++ b/tests/Fakes/FakeTokenGenerator.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Tests\Fakes;
+
+use App\Auth\TokenGenerator;
+
+class FakeTokenGenerator implements TokenGenerator
+{
+    private int $callCount = 0;
+
+    /**
+     * @param string[] $predefinedTokens
+     */
+    public function __construct(
+        private array $predefinedTokens,
+    ) {}
+
+    public function generate(): string
+    {
+        $index = $this->callCount % count($this->predefinedTokens);
+        $this->callCount++;
+
+        return $this->predefinedTokens[$index];
+    }
+}
diff --git a/tests/Fakes/FakeUserRepository.php b/tests/Fakes/FakeUserRepository.php
index 062cae8..b2e766a 100644
--- a/tests/Fakes/FakeUserRepository.php
+++ b/tests/Fakes/FakeUserRepository.php
@@ -5,6 +5,7 @@ namespace Tests\Fakes;
 use App\User\UseCases\CreateUserDto;
 use App\User\User;
 use App\User\UserRepository;
+use App\ValueObjects\EmailAddress;
 
 class FakeUserRepository implements UserRepository
 {
@@ -28,6 +29,28 @@ class FakeUserRepository implements UserRepository
         return new User(
             id: $user->getId(),
             email: $user->getEmail(),
+            passwordHash: $user->getPasswordHash(),
+            isAdmin: $user->isAdmin(),
+        );
+    }
+
+    public function findByEmail(EmailAddress $email): ?User
+    {
+        $user = array_find(
+            $this->existingUsers,
+            function (User $user) use ($email) {
+                return $user->getEmail()->value() === $email->value();
+            }
+        );
+        if ($user === null) {
+            return null;
+        }
+
+        return new User(
+            id: $user->getId(),
+            email: $user->getEmail(),
+            passwordHash: $user->getPasswordHash(),
+            isAdmin: $user->isAdmin(),
         );
     }
 
@@ -37,6 +60,8 @@ class FakeUserRepository implements UserRepository
         $user = new User(
             id: $id,
             email: $dto->email,
+            passwordHash: $dto->passwordHash,
+            isAdmin: $dto->isAdmin,
         );
         $this->existingUsers[$id] = $user;
 
diff --git a/tests/Unit/Auth/Middleware/AdminMiddlewareTest.php b/tests/Unit/Auth/Middleware/AdminMiddlewareTest.php
new file mode 100644
index 0000000..54eecd3
--- /dev/null
+++ b/tests/Unit/Auth/Middleware/AdminMiddlewareTest.php
@@ -0,0 +1,118 @@
+<?php
+
+namespace Tests\Unit\Auth\Middleware;
+
+use App\Auth\AdminMiddleware;
+use App\User\User;
+use App\ValueObjects\EmailAddress;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Slim\Psr7\Factory\ServerRequestFactory;
+use Slim\Psr7\Response;
+
+class AdminMiddlewareTest extends TestCase
+{
+    private AdminMiddleware $middleware;
+
+    public function setUp(): void
+    {
+        $this->middleware = new AdminMiddleware();
+    }
+
+    private function makeApiRequest(?User $user): ServerRequestInterface
+    {
+        $request = new ServerRequestFactory()
+            ->createServerRequest('POST', 'http://localhost/api/texts');
+        if ($user !== null) {
+            $request = $request->withAttribute('user', $user);
+        }
+        return $request;
+    }
+
+    private function makeHtmlRequest(?User $user): ServerRequestInterface
+    {
+        $request = new ServerRequestFactory()
+            ->createServerRequest('GET', 'http://localhost/admin')
+            ->withHeader('Accept', 'text/html');
+        if ($user !== null) {
+            $request = $request->withAttribute('user', $user);
+        }
+        return $request;
+    }
+
+    private function makeHandler(): RequestHandlerInterface
+    {
+        return new class implements RequestHandlerInterface {
+            public bool $wasCalled = false;
+
+            public function handle(
+                ServerRequestInterface $request
+            ): \Psr\Http\Message\ResponseInterface {
+                $this->wasCalled = true;
+                return new Response(200);
+            }
+        };
+    }
+
+    private function makeUser(bool $isAdmin): User
+    {
+        return new User(
+            id: 1,
+            email: new EmailAddress('test@test.com'),
+            passwordHash: '',
+            isAdmin: $isAdmin,
+        );
+    }
+
+    public function test_passes_through_when_user_is_admin(): void
+    {
+        $handler = $this->makeHandler();
+
+        $response = $this->middleware->process(
+            $this->makeApiRequest($this->makeUser(isAdmin: true)),
+            $handler,
+        );
+
+        $this->assertTrue($handler->wasCalled);
+        $this->assertEquals(200, $response->getStatusCode());
+    }
+
+    public function test_returns_403_json_when_user_not_admin_for_api(): void
+    {
+        $response = $this->middleware->process(
+            $this->makeApiRequest($this->makeUser(isAdmin: false)),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+        $this->assertStringContainsString(
+            'application/json',
+            $response->getHeaderLine('Content-Type')
+        );
+    }
+
+    public function test_returns_403_html_when_user_not_admin_for_view(): void
+    {
+        $response = $this->middleware->process(
+            $this->makeHtmlRequest($this->makeUser(isAdmin: false)),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+        $this->assertStringContainsString(
+            '403 Forbidden',
+            (string) $response->getBody()
+        );
+    }
+
+    public function test_returns_403_when_no_user_attribute(): void
+    {
+        $response = $this->middleware->process(
+            $this->makeApiRequest(null),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(403, $response->getStatusCode());
+    }
+}
diff --git a/tests/Unit/Auth/Middleware/AuthMiddlewareTest.php b/tests/Unit/Auth/Middleware/AuthMiddlewareTest.php
new file mode 100644
index 0000000..8408384
--- /dev/null
+++ b/tests/Unit/Auth/Middleware/AuthMiddlewareTest.php
@@ -0,0 +1,161 @@
+<?php
+
+namespace Tests\Unit\Auth\Middleware;
+
+use App\Auth\AuthMiddleware;
+use App\Auth\CreateSessionDto;
+use App\User\UseCases\CreateUserDto;
+use App\User\User;
+use App\ValueObjects\EmailAddress;
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Slim\Psr7\Factory\ServerRequestFactory;
+use Slim\Psr7\Response;
+use Tests\Fakes\FakeClock;
+use Tests\Fakes\FakeSessionRepository;
+use Tests\Fakes\FakeUserRepository;
+
+class AuthMiddlewareTest extends TestCase
+{
+    private FakeUserRepository $userRepo;
+    private FakeSessionRepository $sessionRepo;
+    private FakeClock $clock;
+    private AuthMiddleware $middleware;
+    private User $user;
+
+    public function setUp(): void
+    {
+        $this->userRepo = new FakeUserRepository();
+        $this->sessionRepo = new FakeSessionRepository();
+        $this->clock = new FakeClock(
+            new DateTimeImmutable('2025-01-01T12:00:00+00:00')
+        );
+        $this->user = $this->userRepo->create(new CreateUserDto(
+            email: new EmailAddress('test@test.com'),
+            passwordHash: '',
+        ));
+        $this->middleware = new AuthMiddleware(
+            $this->sessionRepo,
+            $this->userRepo,
+            $this->clock,
+        );
+    }
+
+    private function makeApiRequest(
+        ?string $cookieToken = null
+    ): ServerRequestInterface {
+        $request = new ServerRequestFactory()
+            ->createServerRequest('GET', 'http://localhost/api/texts');
+        if ($cookieToken !== null) {
+            $request = $request->withCookieParams([
+                'auth_token' => $cookieToken,
+            ]);
+        }
+        return $request;
+    }
+
+    private function makeHtmlRequest(
+        ?string $cookieToken = null
+    ): ServerRequestInterface {
+        $request = new ServerRequestFactory()
+            ->createServerRequest('GET', 'http://localhost/home')
+            ->withHeader('Accept', 'text/html');
+        if ($cookieToken !== null) {
+            $request = $request->withCookieParams([
+                'auth_token' => $cookieToken,
+            ]);
+        }
+        return $request;
+    }
+
+    private function makeHandler(): RequestHandlerInterface
+    {
+        return new class implements RequestHandlerInterface {
+            public ?ServerRequestInterface $capturedRequest = null;
+
+            public function handle(
+                ServerRequestInterface $request
+            ): \Psr\Http\Message\ResponseInterface {
+                $this->capturedRequest = $request;
+                return new Response(200);
+            }
+        };
+    }
+
+    public function test_returns_401_json_when_cookie_missing(): void
+    {
+        $response = $this->middleware->process(
+            $this->makeApiRequest(),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(401, $response->getStatusCode());
+        $this->assertStringContainsString(
+            'application/json',
+            $response->getHeaderLine('Content-Type')
+        );
+    }
+
+    public function test_returns_401_when_token_not_in_repo(): void
+    {
+        $response = $this->middleware->process(
+            $this->makeApiRequest('unknown-token'),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(401, $response->getStatusCode());
+    }
+
+    public function test_returns_401_when_token_expired(): void
+    {
+        $this->sessionRepo->create(new CreateSessionDto(
+            token: 'expired-token',
+            userId: $this->user->getId(),
+            createdAt: new DateTimeImmutable('2024-12-01T00:00:00+00:00'),
+            expiresAt: new DateTimeImmutable('2024-12-08T00:00:00+00:00'),
+        ));
+
+        $response = $this->middleware->process(
+            $this->makeApiRequest('expired-token'),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(401, $response->getStatusCode());
+    }
+
+    public function test_attaches_user_to_request_on_success(): void
+    {
+        $this->sessionRepo->create(new CreateSessionDto(
+            token: 'valid-token',
+            userId: $this->user->getId(),
+            createdAt: new DateTimeImmutable('2025-01-01T00:00:00+00:00'),
+            expiresAt: new DateTimeImmutable('2025-01-08T00:00:00+00:00'),
+        ));
+        $handler = $this->makeHandler();
+
+        $this->middleware->process(
+            $this->makeApiRequest('valid-token'),
+            $handler,
+        );
+
+        $attached = $handler->capturedRequest->getAttribute('user');
+        $this->assertInstanceOf(User::class, $attached);
+        $this->assertEquals(
+            'test@test.com',
+            $attached->getEmail()->value()
+        );
+    }
+
+    public function test_redirects_to_login_when_html_unauthenticated(): void
+    {
+        $response = $this->middleware->process(
+            $this->makeHtmlRequest(),
+            $this->makeHandler(),
+        );
+
+        $this->assertEquals(302, $response->getStatusCode());
+        $this->assertEquals('/login', $response->getHeaderLine('Location'));
+    }
+}
diff --git a/tests/Unit/Auth/UseCases/CreateSessionTest.php b/tests/Unit/Auth/UseCases/CreateSessionTest.php
new file mode 100644
index 0000000..a79eb9c
--- /dev/null
+++ b/tests/Unit/Auth/UseCases/CreateSessionTest.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace Tests\Unit\Auth\UseCases;
+
+use App\Auth\UseCases\CreateSession;
+use App\User\User;
+use App\ValueObjects\EmailAddress;
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+use Tests\Fakes\FakeClock;
+use Tests\Fakes\FakeSessionRepository;
+use Tests\Fakes\FakeTokenGenerator;
+
+class CreateSessionTest extends TestCase
+{
+    private FakeSessionRepository $sessionRepo;
+    private FakeTokenGenerator $tokenGenerator;
+    private FakeClock $clock;
+    private CreateSession $useCase;
+    private User $user;
+
+    public function setUp(): void
+    {
+        $this->sessionRepo = new FakeSessionRepository();
+        $this->tokenGenerator = new FakeTokenGenerator(
+            ['generated-token-abc']
+        );
+        $this->clock = new FakeClock(
+            new DateTimeImmutable('2025-01-01T12:00:00+00:00')
+        );
+        $this->useCase = new CreateSession(
+            $this->sessionRepo,
+            $this->tokenGenerator,
+            $this->clock,
+        );
+        $this->user = new User(
+            id: 7,
+            email: new EmailAddress('test@test.com'),
+            passwordHash: 'hashed:password1',
+            isAdmin: false,
+        );
+    }
+
+    public function test_creates_session_for_user(): void
+    {
+        $session = $this->useCase->execute($this->user);
+
+        $this->assertEquals(7, $session->getUserId());
+    }
+
+    public function test_session_token_comes_from_generator(): void
+    {
+        $session = $this->useCase->execute($this->user);
+
+        $this->assertEquals('generated-token-abc', $session->getToken());
+    }
+
+    public function test_session_created_at_is_now(): void
+    {
+        $session = $this->useCase->execute($this->user);
+
+        $this->assertEquals(
+            new DateTimeImmutable('2025-01-01T12:00:00+00:00'),
+            $session->getCreatedAt()
+        );
+    }
+
+    public function test_session_expires_in_seven_days(): void
+    {
+        $session = $this->useCase->execute($this->user);
+
+        $this->assertEquals(
+            new DateTimeImmutable('2025-01-08T12:00:00+00:00'),
+            $session->getExpiresAt()
+        );
+    }
+
+    public function test_session_is_persisted(): void
+    {
+        $this->useCase->execute($this->user);
+
+        $found = $this->sessionRepo->findByToken('generated-token-abc');
+        $this->assertNotNull($found);
+    }
+}
diff --git a/tests/Unit/Plan/UseCases/CreatePlanTest.php b/tests/Unit/Plan/UseCases/CreatePlanTest.php
index 667e72c..f88bc89 100644
--- a/tests/Unit/Plan/UseCases/CreatePlanTest.php
+++ b/tests/Unit/Plan/UseCases/CreatePlanTest.php
@@ -39,6 +39,7 @@ class CreatePlanTest extends TestCase
         $this->scheduledNodeRepo = new FakeScheduledNodeRepository();
         $this->userRepo->create(new CreateUserDto(
             email: new EmailAddress('test@test.com'),
+            passwordHash: '',
         ));
         $this->createScheduledNode = new CreateScheduledNode(
             scheduledNodeRepo: $this->scheduledNodeRepo,
@@ -232,8 +233,8 @@ class CreatePlanTest extends TestCase
         ));
     }
 
-     public function test_scheduled_nodes_are_scheduled_on_different_days(): void
-     {
+    public function test_scheduled_nodes_are_scheduled_on_different_days(): void
+    {
         $text = $this->textRepo->find(0);
         $rootNode = $this->nodeRepo->create(new CreateNodeDto(
             text: $text,
@@ -269,10 +270,10 @@ class CreatePlanTest extends TestCase
             new DateTimeImmutable('2025-01-02'),
             $childTwo->getDate()
         );
-     }
+    }
 
-     public function test_more_scheduled_nodes_than_days(): void
-     {
+    public function test_more_scheduled_nodes_than_days(): void
+    {
         $text = $this->textRepo->find(0);
         $rootNode = $this->nodeRepo->create(new CreateNodeDto(
             text: $text,
@@ -319,5 +320,5 @@ class CreatePlanTest extends TestCase
             new DateTimeImmutable('2025-01-02'),
             $childThree->getDate()
         );
-     }
+    }
 }
diff --git a/tests/Unit/ScheduledNode/UseCases/CreateScheduledNodeTest.php b/tests/Unit/ScheduledNode/UseCases/CreateScheduledNodeTest.php
index d2bfc2b..477a07a 100644
--- a/tests/Unit/ScheduledNode/UseCases/CreateScheduledNodeTest.php
+++ b/tests/Unit/ScheduledNode/UseCases/CreateScheduledNodeTest.php
@@ -30,7 +30,12 @@ class CreateScheduledNodeTest extends TestCase
         $this->planRepo = new FakePlanRepository();
         $this->planRepo->create(new CreatePlanDto(
             name: 'testplan',
-            user: new User(0, new EmailAddress('test@test.com')),
+            user: new User(
+                id: 0,
+                email: new EmailAddress('test@test.com'),
+                passwordHash: 'hashed:password1',
+                isAdmin: false,
+            ),
         ));
         $this->useCase = new CreateScheduledNode(
             $this->scheduledNodeRepo,
diff --git a/tests/Unit/User/UseCases/AuthenticateUserTest.php b/tests/Unit/User/UseCases/AuthenticateUserTest.php
new file mode 100644
index 0000000..88bb1a9
--- /dev/null
+++ b/tests/Unit/User/UseCases/AuthenticateUserTest.php
@@ -0,0 +1,95 @@
+<?php
+
+namespace Tests\Unit\User\UseCases;
+
+use App\Exceptions\BadRequestException;
+use App\Exceptions\UnauthorizedException;
+use App\User\UseCases\AuthenticateUser;
+use App\User\UseCases\AuthenticateUserRequest;
+use App\User\UseCases\CreateUser;
+use App\User\UseCases\CreateUserRequest;
+use App\User\User;
+use PHPUnit\Framework\TestCase;
+use Tests\Fakes\FakePasswordHasher;
+use Tests\Fakes\FakeUserRepository;
+
+class AuthenticateUserTest extends TestCase
+{
+    private FakeUserRepository $userRepo;
+    private FakePasswordHasher $passwordHasher;
+    private AuthenticateUser $useCase;
+
+    public function setUp(): void
+    {
+        $this->userRepo = new FakeUserRepository();
+        $this->passwordHasher = new FakePasswordHasher();
+        $createUser = new CreateUser(
+            $this->userRepo,
+            $this->passwordHasher,
+        );
+        $createUser->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: 'password1',
+            isAdmin: false,
+        ));
+        $this->useCase = new AuthenticateUser(
+            $this->userRepo,
+            $this->passwordHasher,
+        );
+    }
+
+    public function test_returns_user_on_valid_credentials(): void
+    {
+        $user = $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'test@test.com',
+            password: 'password1',
+        ));
+
+        $this->assertInstanceOf(User::class, $user);
+        $this->assertEquals('test@test.com', $user->getEmail()->value());
+    }
+
+    public function test_throws_bad_request_when_email_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('email is required');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: null,
+            password: 'password1',
+        ));
+    }
+
+    public function test_throws_bad_request_when_password_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('password is required');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'test@test.com',
+            password: null,
+        ));
+    }
+
+    public function test_throws_unauthorized_on_wrong_password(): void
+    {
+        $this->expectException(UnauthorizedException::class);
+        $this->expectExceptionMessage('invalid credentials');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'test@test.com',
+            password: 'wrongpassword',
+        ));
+    }
+
+    public function test_throws_unauthorized_when_email_not_found(): void
+    {
+        $this->expectException(UnauthorizedException::class);
+        $this->expectExceptionMessage('invalid credentials');
+
+        $this->useCase->execute(new AuthenticateUserRequest(
+            email: 'missing@test.com',
+            password: 'password1',
+        ));
+    }
+}
diff --git a/tests/Unit/User/UseCases/CreateUserTest.php b/tests/Unit/User/UseCases/CreateUserTest.php
index 180046f..0333a52 100644
--- a/tests/Unit/User/UseCases/CreateUserTest.php
+++ b/tests/Unit/User/UseCases/CreateUserTest.php
@@ -6,33 +6,119 @@ use App\Exceptions\BadRequestException;
 use App\User\User;
 use App\User\UseCases\CreateUser;
 use App\User\UseCases\CreateUserRequest;
+use Tests\Fakes\FakePasswordHasher;
 use Tests\Fakes\FakeUserRepository;
 use PHPUnit\Framework\TestCase;
 
 class CreateUserTest extends TestCase
 {
+    private FakeUserRepository $userRepo;
+    private FakePasswordHasher $passwordHasher;
+    private CreateUser $useCase;
+
+    public function setUp(): void
+    {
+        $this->userRepo = new FakeUserRepository();
+        $this->passwordHasher = new FakePasswordHasher();
+        $this->useCase = new CreateUser(
+            $this->userRepo,
+            $this->passwordHasher,
+        );
+    }
+
     public function test_create_user(): void
     {
-        $userRepo = new FakeUserRepository();
-        $useCase = new CreateUser($userRepo);
-        $useCase->execute(new CreateUserRequest(
+        $this->useCase->execute(new CreateUserRequest(
             email: 'test@test.com',
+            password: 'password1',
+            isAdmin: false,
         ));
-        $user = $userRepo->find(0);
+        $user = $this->userRepo->find(0);
         $this->assertInstanceOf(User::class, $user);
         $this->assertEquals('test@test.com', $user->getEmail());
     }
 
     public function test_throws_if_email_is_null(): void
     {
-        $userRepo = new FakeUserRepository();
-        $useCase = new CreateUser($userRepo);
-
         $this->expectException(BadRequestException::class);
         $this->expectExceptionMessage('email is required');
 
-        $useCase->execute(new CreateUserRequest(
+        $this->useCase->execute(new CreateUserRequest(
             email: null,
+            password: 'password1',
+            isAdmin: false,
         ));
     }
+
+    public function test_is_admin_can_be_set_true(): void
+    {
+        $this->useCase->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: 'password1',
+            isAdmin: true,
+        ));
+        $user = $this->userRepo->find(0);
+        $this->assertTrue($user->isAdmin());
+    }
+
+    public function test_throws_when_email_already_taken(): void
+    {
+        $this->useCase->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: 'password1',
+            isAdmin: false,
+        ));
+
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('email already taken');
+
+        $this->useCase->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: 'password1',
+            isAdmin: false
+        ));
+    }
+
+    public function test_throws_if_password_is_null(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('password is required');
+
+        $this->useCase->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: null,
+            isAdmin: false,
+        ));
+    }
+
+    public function test_throws_if_password_too_short(): void
+    {
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage(
+            'password must be at least 8 characters'
+        );
+
+        $this->useCase->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: 'short',
+            isAdmin: false,
+        ));
+    }
+
+    public function test_stores_hashed_password(): void
+    {
+        $this->useCase->execute(new CreateUserRequest(
+            email: 'test@test.com',
+            password: 'password1',
+            isAdmin: false,
+        ));
+        $user = $this->userRepo->find(0);
+        $this->assertNotEquals('password1', $user->getPasswordHash());
+        $this->assertTrue(
+            $this->passwordHasher->verify(
+                'password1',
+                $user->getPasswordHash()
+            )
+        );
+    }
 }
diff --git a/tests/e2e/Controllers/AuthControllerTest.php b/tests/e2e/Controllers/AuthControllerTest.php
new file mode 100644
index 0000000..50e39a5
--- /dev/null
+++ b/tests/e2e/Controllers/AuthControllerTest.php
@@ -0,0 +1,294 @@
+<?php
+
+namespace Tests\e2e\Controllers;
+
+use App\Auth\AuthController;
+use App\Auth\CreateSessionDto;
+use App\Auth\UseCases\CreateSession;
+use App\User\UseCases\AuthenticateUser;
+use App\User\UseCases\CreateUser;
+use App\User\UseCases\CreateUserRequest;
+use App\User\User;
+use App\ValueObjects\EmailAddress;
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ServerRequestInterface;
+use Slim\Psr7\Factory\ServerRequestFactory;
+use Slim\Psr7\Factory\StreamFactory;
+use Slim\Psr7\Response;
+use Tests\Fakes\FakeClock;
+use Tests\Fakes\FakePasswordHasher;
+use Tests\Fakes\FakeSessionRepository;
+use Tests\Fakes\FakeTokenGenerator;
+use Tests\Fakes\FakeUserRepository;
+
+class AuthControllerTest extends TestCase
+{
+    private FakeUserRepository $userRepo;
+    private FakeSessionRepository $sessionRepo;
+    private FakeTokenGenerator $tokenGenerator;
+    private FakeClock $clock;
+    private FakePasswordHasher $passwordHasher;
+    private CreateUser $createUser;
+    private AuthenticateUser $authenticateUser;
+    private CreateSession $createSession;
+    private AuthController $controller;
+
+    public function setUp(): void
+    {
+        $this->userRepo = new FakeUserRepository();
+        $this->sessionRepo = new FakeSessionRepository();
+        $this->tokenGenerator = new FakeTokenGenerator(
+            ['session-token-xyz']
+        );
+        $this->clock = new FakeClock(
+            new DateTimeImmutable('2025-01-01T12:00:00+00:00')
+        );
+        $this->passwordHasher = new FakePasswordHasher();
+
+        $this->createUser = new CreateUser(
+            $this->userRepo,
+            $this->passwordHasher,
+        );
+        $this->authenticateUser = new AuthenticateUser(
+            $this->userRepo,
+            $this->passwordHasher,
+        );
+        $this->createSession = new CreateSession(
+            $this->sessionRepo,
+            $this->tokenGenerator,
+            $this->clock,
+        );
+
+        $this->createUser->execute(new CreateUserRequest(
+            email: 'existing@test.com',
+            password: 'password1',
+            isAdmin: false,
+        ));
+
+        $this->controller = new AuthController();
+    }
+
+    private function makeJsonRequest(
+        string $method,
+        string $path,
+        array $data,
+    ): ServerRequestInterface {
+        $body = new StreamFactory()->createStream(json_encode($data));
+        return new ServerRequestFactory()
+            ->createServerRequest($method, 'http://localhost' . $path)
+            ->withHeader('Content-Type', 'application/json')
+            ->withBody($body);
+    }
+
+    public function test_login_returns_200_and_user(): void
+    {
+        $response = $this->controller->login(
+            $this->makeJsonRequest('POST', '/api/auth/login', [
+                'email' => 'existing@test.com',
+                'password' => 'password1',
+            ]),
+            new Response(),
+            $this->authenticateUser,
+            $this->createSession,
+        );
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $body = json_decode($response->getBody(), true);
+        $this->assertEquals(
+            'existing@test.com',
+            $body['user']['email']
+        );
+    }
+
+    public function test_login_sets_auth_cookie(): void
+    {
+        $response = $this->controller->login(
+            $this->makeJsonRequest('POST', '/api/auth/login', [
+                'email' => 'existing@test.com',
+                'password' => 'password1',
+            ]),
+            new Response(),
+            $this->authenticateUser,
+            $this->createSession,
+        );
+
+        $setCookie = $response->getHeaderLine('Set-Cookie');
+        $this->assertStringContainsString(
+            'auth_token=session-token-xyz',
+            $setCookie
+        );
+        $this->assertStringContainsString('HttpOnly', $setCookie);
+        $this->assertStringContainsString('SameSite=Lax', $setCookie);
+        $this->assertStringContainsString('Path=/', $setCookie);
+    }
+
+    public function test_login_creates_session(): void
+    {
+        $this->controller->login(
+            $this->makeJsonRequest('POST', '/api/auth/login', [
+                'email' => 'existing@test.com',
+                'password' => 'password1',
+            ]),
+            new Response(),
+            $this->authenticateUser,
+            $this->createSession,
+        );
+
+        $this->assertNotNull(
+            $this->sessionRepo->findByToken('session-token-xyz')
+        );
+    }
+
+    public function test_login_returns_401_on_wrong_password(): void
+    {
+        $response = $this->controller->login(
+            $this->makeJsonRequest('POST', '/api/auth/login', [
+                'email' => 'existing@test.com',
+                'password' => 'wrongpassword',
+            ]),
+            new Response(),
+            $this->authenticateUser,
+            $this->createSession,
+        );
+
+        $this->assertEquals(401, $response->getStatusCode());
+    }
+
+    public function test_login_returns_400_when_email_missing(): void
+    {
+        $response = $this->controller->login(
+            $this->makeJsonRequest('POST', '/api/auth/login', [
+                'password' => 'password1',
+            ]),
+            new Response(),
+            $this->authenticateUser,
+            $this->createSession,
+        );
+
+        $this->assertEquals(400, $response->getStatusCode());
+    }
+
+    public function test_register_creates_user_and_logs_in(): void
+    {
+        $response = $this->controller->register(
+            $this->makeJsonRequest('POST', '/api/auth/register', [
+                'email' => 'new@test.com',
+                'password' => 'password1',
+            ]),
+            new Response(),
+            $this->createUser,
+            $this->createSession,
+        );
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $body = json_decode($response->getBody(), true);
+        $this->assertEquals('new@test.com', $body['user']['email']);
+        $setCookie = $response->getHeaderLine('Set-Cookie');
+        $this->assertStringContainsString(
+            'auth_token=session-token-xyz',
+            $setCookie
+        );
+    }
+
+    public function test_register_returns_400_on_short_password(): void
+    {
+        $response = $this->controller->register(
+            $this->makeJsonRequest('POST', '/api/auth/register', [
+                'email' => 'new@test.com',
+                'password' => 'short',
+            ]),
+            new Response(),
+            $this->createUser,
+            $this->createSession,
+        );
+
+        $this->assertEquals(400, $response->getStatusCode());
+    }
+
+    public function test_register_returns_400_on_duplicate_email(): void
+    {
+        $response = $this->controller->register(
+            $this->makeJsonRequest('POST', '/api/auth/register', [
+                'email' => 'existing@test.com',
+                'password' => 'password1',
+            ]),
+            new Response(),
+            $this->createUser,
+            $this->createSession,
+        );
+
+        $this->assertEquals(400, $response->getStatusCode());
+    }
+
+    public function test_register_ignores_is_admin_in_body(): void
+    {
+        $this->controller->register(
+            $this->makeJsonRequest('POST', '/api/auth/register', [
+                'email' => 'sneaky@test.com',
+                'password' => 'password1',
+                'isAdmin' => true,
+            ]),
+            new Response(),
+            $this->createUser,
+            $this->createSession,
+        );
+
+        $newUser = $this->userRepo->findByEmail(
+            new EmailAddress('sneaky@test.com')
+        );
+        $this->assertFalse($newUser->isAdmin());
+    }
+
+    public function test_logout_deletes_session_and_clears_cookie(): void
+    {
+        $this->sessionRepo->create(new CreateSessionDto(
+            token: 'existing-session',
+            userId: 0,
+            createdAt: new DateTimeImmutable('2025-01-01T00:00:00+00:00'),
+            expiresAt: new DateTimeImmutable('2025-01-08T00:00:00+00:00'),
+        ));
+
+        $request = $this->makeJsonRequest(
+            'POST',
+            '/api/auth/logout',
+            []
+        )->withCookieParams(['auth_token' => 'existing-session']);
+
+        $response = $this->controller->logout(
+            $request,
+            new Response(),
+            $this->sessionRepo,
+        );
+
+        $this->assertEquals(204, $response->getStatusCode());
+        $this->assertNull(
+            $this->sessionRepo->findByToken('existing-session')
+        );
+        $this->assertStringContainsString(
+            'auth_token=;',
+            $response->getHeaderLine('Set-Cookie')
+        );
+    }
+
+    public function test_me_returns_current_user(): void
+    {
+        $user = new User(
+            id: 5,
+            email: new EmailAddress('me@test.com'),
+            passwordHash: '',
+            isAdmin: true,
+        );
+        $request = new ServerRequestFactory()
+            ->createServerRequest('GET', 'http://localhost/api/auth/me')
+            ->withAttribute('user', $user);
+
+        $response = $this->controller->me($request, new Response());
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $body = json_decode($response->getBody(), true);
+        $this->assertEquals(5, $body['user']['id']);
+        $this->assertEquals('me@test.com', $body['user']['email']);
+        $this->assertTrue($body['user']['isAdmin']);
+    }
+}
diff --git a/tests/e2e/Controllers/PlanControllerTest.php b/tests/e2e/Controllers/PlanControllerTest.php
index ee51012..cf0eeb0 100644
--- a/tests/e2e/Controllers/PlanControllerTest.php
+++ b/tests/e2e/Controllers/PlanControllerTest.php
@@ -8,6 +8,7 @@ use App\Plan\UseCases\CreatePlan;
 use App\ScheduledNode\UseCases\CreateScheduledNode;
 use App\Text\CreateTextDto;
 use App\User\UseCases\CreateUserDto;
+use App\User\User;
 use App\ValueObjects\EmailAddress;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\ServerRequestInterface;
@@ -29,6 +30,7 @@ class PlanControllerTest extends TestCase
     private FakeScheduledNodeRepository $scheduledNodeRepo;
     private CreatePlan $createPlan;
     private PlanController $controller;
+    private User $user;
 
     public function setUp(): void
     {
@@ -38,8 +40,9 @@ class PlanControllerTest extends TestCase
         $this->nodeRepo = new FakeNodeRepository();
         $this->scheduledNodeRepo = new FakeScheduledNodeRepository();
 
-        $this->userRepo->create(new CreateUserDto(
+        $this->user = $this->userRepo->create(new CreateUserDto(
             email: new EmailAddress('test@test.com'),
+            passwordHash: '',
         ));
         $text = $this->textRepo->create(new CreateTextDto('testname'));
         $this->nodeRepo->create(new CreateNodeDto(
@@ -68,6 +71,7 @@ class PlanControllerTest extends TestCase
         return new ServerRequestFactory()
             ->createServerRequest('POST', 'http://localhost/api/plans')
             ->withHeader('Content-Type', 'application/json')
+            ->withAttribute('user', $this->user)
             ->withBody($body);
     }
 
@@ -75,7 +79,6 @@ class PlanControllerTest extends TestCase
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'name' => 'My Plan',
                 'dateStart' => '2025-01-01',
@@ -91,29 +94,33 @@ class PlanControllerTest extends TestCase
         $this->assertEquals('My Plan', $body['name']);
     }
 
-    public function test_create_plan_returns_400_when_user_id_missing(): void
+    public function test_create_plan_returns_401_when_no_user(): void
     {
+        $requestWithoutUser = new ServerRequestFactory()
+            ->createServerRequest('POST', 'http://localhost/api/plans')
+            ->withHeader('Content-Type', 'application/json')
+            ->withBody(
+                new StreamFactory()->createStream(json_encode([
+                    'textId' => 0,
+                    'name' => 'My Plan',
+                    'dateStart' => '2025-01-01',
+                    'dateEnd' => '2025-01-01',
+                ]))
+            );
+
         $response = $this->controller->createPlan(
-            $this->makeRequest([
-                'textId' => 0,
-                'name' => 'My Plan',
-                'dateStart' => '2025-01-01',
-                'dateEnd' => '2025-01-01',
-            ]),
+            $requestWithoutUser,
             new Response(),
             $this->createPlan,
         );
 
-        $this->assertEquals(400, $response->getStatusCode());
-        $body = json_decode($response->getBody(), true);
-        $this->assertArrayHasKey('error', $body);
+        $this->assertEquals(401, $response->getStatusCode());
     }
 
     public function test_create_plan_returns_400_when_text_id_missing(): void
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'name' => 'My Plan',
                 'dateStart' => '2025-01-01',
                 'dateEnd' => '2025-01-01',
@@ -131,7 +138,6 @@ class PlanControllerTest extends TestCase
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'dateStart' => '2025-01-01',
                 'dateEnd' => '2025-01-01',
@@ -149,7 +155,6 @@ class PlanControllerTest extends TestCase
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'name' => 'My Plan',
                 'dateEnd' => '2025-01-01',
@@ -167,7 +172,6 @@ class PlanControllerTest extends TestCase
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'name' => 'My Plan',
                 'dateStart' => '2025-01-01',
@@ -185,7 +189,6 @@ class PlanControllerTest extends TestCase
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'name' => 'My Plan',
                 'dateStart' => '2025-01-02',
@@ -200,30 +203,10 @@ class PlanControllerTest extends TestCase
         $this->assertArrayHasKey('error', $body);
     }
 
-    public function test_create_plan_returns_404_when_user_not_found(): void
-    {
-        $response = $this->controller->createPlan(
-            $this->makeRequest([
-                'userId' => 99,
-                'textId' => 0,
-                'name' => 'My Plan',
-                'dateStart' => '2025-01-01',
-                'dateEnd' => '2025-01-01',
-            ]),
-            new Response(),
-            $this->createPlan,
-        );
-
-        $this->assertEquals(404, $response->getStatusCode());
-        $body = json_decode($response->getBody(), true);
-        $this->assertArrayHasKey('error', $body);
-    }
-
     public function test_create_plan_returns_404_when_text_not_found(): void
     {
         $response = $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 99,
                 'name' => 'My Plan',
                 'dateStart' => '2025-01-01',
@@ -242,7 +225,6 @@ class PlanControllerTest extends TestCase
     {
         $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'name' => 'Persistent Plan',
                 'dateStart' => '2025-01-01',
@@ -261,7 +243,6 @@ class PlanControllerTest extends TestCase
     {
         $this->controller->createPlan(
             $this->makeRequest([
-                'userId' => 0,
                 'textId' => 0,
                 'name' => 'Scheduling Plan',
                 'dateStart' => '2025-01-01',
diff --git a/views/templates/admin.php b/views/templates/admin.php
index 7f463d4..f1fc83d 100644
--- a/views/templates/admin.php
+++ b/views/templates/admin.php
@@ -4,6 +4,8 @@
     <title>Daily Goals - Admin</title>
 </head>
 <body>
+    <button id="logout">Logout</button>
     <a href="/admin/texts" id="texts">Texts</a>
+    <script src="/js/auth.js"></script>
 </body>
 </html>
diff --git a/views/templates/forbidden.php b/views/templates/forbidden.php
new file mode 100644
index 0000000..43cd644
--- /dev/null
+++ b/views/templates/forbidden.php
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Daily Goals - Forbidden</title>
+</head>
+<body>
+    <h1>403 Forbidden</h1>
+    <p>You do not have permission to access this page.</p>
+    <a href="/home">Back to Home</a>
+</body>
+</html>
diff --git a/views/templates/home.php b/views/templates/home.php
index ddbc361..4f7a096 100644
--- a/views/templates/home.php
+++ b/views/templates/home.php
@@ -5,6 +5,7 @@
 </head>
 <body>
     <h1>Home</h1>
+    <button id="logout">Logout</button>
     <ul id="texts-list">
     </ul>
     <div id="create-plan-modal" hidden>
@@ -21,6 +22,7 @@
         <button class="save-plan">Save</button>
         <button class="cancel-plan">Cancel</button>
     </div>
+    <script src="/js/auth.js"></script>
     <script src="/js/home.js"></script>
 </body>
 </html>
diff --git a/views/templates/login.php b/views/templates/login.php
new file mode 100644
index 0000000..93f4b56
--- /dev/null
+++ b/views/templates/login.php
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Daily Goals - Login</title>
+</head>
+<body>
+    <h1>Login</h1>
+    <form id="login-form">
+        <label>Email
+            <input type="email" id="email" name="email" required />
+        </label>
+        <label>Password
+            <input
+                type="password"
+                id="password"
+                name="password"
+                required
+            />
+        </label>
+        <button type="submit">Login</button>
+    </form>
+    <p id="login-error" hidden></p>
+    <p><a href="/register">Register</a></p>
+    <script src="/js/auth.js"></script>
+</body>
+</html>
diff --git a/views/templates/register.php b/views/templates/register.php
new file mode 100644
index 0000000..223247c
--- /dev/null
+++ b/views/templates/register.php
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Daily Goals - Register</title>
+</head>
+<body>
+    <h1>Register</h1>
+    <form id="register-form">
+        <label>Email
+            <input type="email" id="email" name="email" required />
+        </label>
+        <label>Password (min 8 characters)
+            <input
+                type="password"
+                id="password"
+                name="password"
+                minlength="8"
+                required
+            />
+        </label>
+        <button type="submit">Register</button>
+    </form>
+    <p id="register-error" hidden></p>
+    <p><a href="/login">Already have an account? Login</a></p>
+    <script src="/js/auth.js"></script>
+</body>
+</html>