diff --git a/db.php b/db.php
new file mode 100644
index 0000000..ef4cbff
--- /dev/null
+++ b/db.php
@@ -0,0 +1,22 @@
+<?php
+function getConnection() {
+    $host = getenv('DB_HOST') ?: 'localhost';
+    $db   = getenv('DB_NAME') ?: 'your_db_name';
+    $user = getenv('DB_USER') ?: 'your_username';
+    $pass = getenv('DB_PASS') ?: 'your_password';
+    $charset = 'utf8mb4';
+
+    $dsn = "mysql:host=$host;dbname=$db;charset=$charset";
+    $options = [
+        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+        PDO::ATTR_EMULATE_PREPARES   => false,
+    ];
+
+    try {
+        return new PDO($dsn, $user, $pass, $options);
+    } catch (\PDOException $e) {
+        die("Database connection failed: " . $e->getMessage());
+    }
+}
+?>
diff --git a/home.php b/home.php
index 3319270..826f2ed 100644
--- a/home.php
+++ b/home.php
@@ -1,4 +1,7 @@
-<?php include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');?>
+<?php include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');
+require_once($_SERVER['DOCUMENT_ROOT'] . '/db.php');
+$conn = getConnection();?>
+
 <body>
     <div class="container">
         <h1>AI Email Generator</h1>
diff --git a/inc/php/auth.php b/inc/php/auth.php
new file mode 100644
index 0000000..42aa0f8
--- /dev/null
+++ b/inc/php/auth.php
@@ -0,0 +1,8 @@
+<?php
+session_start();
+
+if (!isset($_SESSION['user_id'])) {
+    header("Location: /landing.php");
+    exit();
+}
+?>
diff --git a/index.php b/index.php
index e6aa82c..2e1dc1f 100644
--- a/index.php
+++ b/index.php
@@ -1,7 +1,11 @@
 <?php
-    include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');
-    include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/resources.php');
-    $languages = getLanguages();
+include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');
+include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/resources.php');
+
+require_once($_SERVER['DOCUMENT_ROOT'] . '/db.php');
+$conn = getConnection();
+
+$languages = getLanguages();
 ?>
 <body>
     <div class="container">
@@ -19,13 +23,15 @@
 
             <label for="language">Select Language:</label>
             <select name="language" id="language" required>
-                <?php foreach($languages as $language) :?>
-                    <option value="<?=$language;?>"><?=$language;?></option>
-                <?php endforeach;?>
+                <?php foreach ($languages as $language): ?>
+                    <option value="<?= htmlspecialchars($language) ?>"><?= htmlspecialchars($language) ?></option>
+                <?php endforeach; ?>
             </select>
 
             <button type="submit">Generate Email</button>
             <button id="darkModeBtn" type="button">Toggle Dark Mode</button>
         </form>
     </div>
-<?php include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/footer.php');
+
+    <script src="/inc/js/theme.js"></script>
+<?php include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/footer.php'); ?>
diff --git a/landing.php b/landing.php
new file mode 100644
index 0000000..44402bf
--- /dev/null
+++ b/landing.php
@@ -0,0 +1,28 @@
+<?php 
+    session_start();
+
+if (isset($_SESSION['user_id'])) {
+    // Already logged in, redirect to email generator
+    header("Location: /home.php"); 
+    exit();
+}
+
+    include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php'); 
+?>
+<body>
+    <div class="container" style="text-align: center;">
+        <h1>Welcome to AI Email Generator</h1>
+        <p style="margin-bottom: 20px;">Craft professional emails in seconds. Please login or register to get started.</p>
+        
+        <div style="display: flex; justify-content: center; gap: 20px;">
+            <a href="/inc/php/login.php"><button style="padding: 10px 20px;">Login</button></a>
+            <a href="/inc/php/register.php"><button style="padding: 10px 20px;">Register</button></a>
+        </div>
+
+        <div style="margin-top: 30px;">
+            <button id="darkModeBtn">Toggle Dark Mode</button>
+        </div>
+    </div>
+
+    <script src="/inc/js/theme.js"></script>
+<?php include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/footer.php'); ?>
diff --git a/login.php b/login.php
new file mode 100644
index 0000000..c4e61ab
--- /dev/null
+++ b/login.php
@@ -0,0 +1,29 @@
+<?php
+session_start();
+require_once 'db.php';
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    $email = trim($_POST['email']);
+    $password = $_POST['password'];
+
+    $conn = getConnection();
+    $stmt = $conn->prepare("SELECT id, username, password FROM Users WHERE email = ?");
+    $stmt->execute([$email]);
+    $user = $stmt->fetch();
+
+    if ($user && password_verify($password, $user['password'])) {
+        $_SESSION['user_id'] = $user['id'];
+        $_SESSION['username'] = $user['username'];
+        header('Location: home.php');
+        exit;
+    } else {
+        echo "Invalid credentials.";
+    }
+}
+?>
+
+<form method="POST">
+    <input type="email" name="email" placeholder="Email" required>
+    <input type="password" name="password" placeholder="Password" required>
+    <button type="submit">Login</button>
+</form>
\ No newline at end of file
diff --git a/logout.php b/logout.php
new file mode 100644
index 0000000..ca9c48c
--- /dev/null
+++ b/logout.php
@@ -0,0 +1,6 @@
+<?php
+session_start();
+session_unset();
+session_destroy();
+header('Location: login.php');
+exit;
\ No newline at end of file
diff --git a/process.php b/process.php
index 84acb40..d7fe7a7 100644
--- a/process.php
+++ b/process.php
@@ -1,6 +1,9 @@
 <?php 
     require_once($_SERVER['DOCUMENT_ROOT'] . '/config.php');
     include($_SERVER['DOCUMENT_ROOT'] . '/inc/php/header.php');
+    require_once($_SERVER['DOCUMENT_ROOT'] . '/db.php');
+    require_once($_SERVER['DOCUMENT_ROOT'] . '/inc/php/auth.php');
+    $conn = getConnection();
 ?>
 
 <body>
diff --git a/register.php b/register.php
new file mode 100644
index 0000000..8a2bb2d
--- /dev/null
+++ b/register.php
@@ -0,0 +1,36 @@
+<?php
+require_once 'db.php';
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    $username = trim($_POST['username']);
+    $email = trim($_POST['email']);
+    $password = $_POST['password'];
+
+    if (!$username || !$email || !$password) {
+        die('All fields are required.');
+    }
+
+    $conn = getConnection();
+    
+    // Check if user exists
+    $stmt = $conn->prepare("SELECT id FROM Users WHERE email = ?");
+    $stmt->execute([$email]);
+    if ($stmt->fetch()) {
+        die('Email already registered.');
+    }
+
+    $hashed = password_hash($password, PASSWORD_DEFAULT);
+    $stmt = $conn->prepare("INSERT INTO Users (username, email, password) VALUES (?, ?, ?)");
+    $stmt->execute([$username, $email, $hashed]);
+
+    header('Location: login.php');
+    exit;
+}
+?>
+
+<form method="POST">
+    <input type="text" name="username" placeholder="Username" required>
+    <input type="email" name="email" placeholder="Email" required>
+    <input type="password" name="password" placeholder="Password" required>
+    <button type="submit">Register</button>
+</form>
\ No newline at end of file
