diff --git a/config/ldap.php b/config/ldap.php
new file mode 100644
index 0000000..cf82670
--- /dev/null
+++ b/config/ldap.php
@@ -0,0 +1,86 @@
+<?php
+// config/ldap.php
+
+$LDAP_HOST = "ITFA-PROJ-SRV.ITFA-PROJ-DOM.local";
+$LDAP_PORT = 389;
+$LDAP_BASE_DN = "DC=ITFA-PROJ-DOM,DC=local";
+$LDAP_UPN_SUFFIX   = "@ITFA-PROJ-DOM.local";
+$LDAP_NETBIOS_NAME = "ITFA-PROJ-DOM"; // falls man mal DOMAIN\user nutzen will
+
+// einfacher Logger für LDAP
+function ldap_log($message)
+{
+    $logDir  = dirname(__DIR__) . '/logs';
+    $logFile = $logDir . '/ldap.log';
+
+    if (!is_dir($logDir)) {
+        mkdir($logDir, 0770, true);
+    }
+
+    $line = date('c') . " [LDAP] " . $message . PHP_EOL;
+    // KEIN Passwort loggen!
+    file_put_contents($logFile, $line, FILE_APPEND);
+}
+
+/**
+ * LDAP-Login
+ * @param string $username  SAM-Accountname ohne Domain
+ * @param string $password  Klartext-Passwort (nicht loggen!)
+ * @param string|null $errorDetail  wird mit technischem Fehlertext gefüllt
+ * @return resource|false   LDAP-Verbindung bei Erfolg, sonst false
+ */
+function ldap_authenticate($username, $password, ?string &$errorDetail = null)
+{
+    global $LDAP_HOST, $LDAP_PORT, $LDAP_UPN_SUFFIX;
+
+    $errorDetail = "";
+
+    if ($username === "" || $password === "") {
+        $errorDetail = "Username oder Passwort leer.";
+        ldap_log($errorDetail);
+        return false;
+    }
+
+    $connection = @ldap_connect($LDAP_HOST, $LDAP_PORT);
+
+    if ($connection === false) {
+        $errorDetail = "Verbindung zu LDAP-Host '$LDAP_HOST:$LDAP_PORT' fehlgeschlagen.";
+        ldap_log($errorDetail);
+        return false;
+    }
+
+    // Optionen setzen
+    ldap_set_option($connection, LDAP_OPT_PROTOCOL_VERSION, 3);
+    ldap_set_option($connection, LDAP_OPT_REFERRALS, 0);
+
+    //StartTLS
+    if (!@ldap_start_tls($connection)) {
+        $errNo  = ldap_errno($connection);
+        $errStr = ldap_error($connection);
+
+        $errorDetail = "ldap_start_tls fehlgeschlagen (Fehler {$errNo}: {$errStr}).";
+        ldap_log($errorDetail);
+
+        ldap_unbind($connection);
+        return false;
+    }
+
+    // UPN-Login: user@domain
+    $bindRdn = $username . $LDAP_UPN_SUFFIX;
+
+    $bind = @ldap_bind($connection, $bindRdn, $password);
+
+    if ($bind === false) {
+        $errNo  = ldap_errno($connection);
+        $errStr = ldap_error($connection);
+
+        $errorDetail = "Bind fehlgeschlagen für '$bindRdn' (Fehler $errNo: $errStr).";
+        ldap_log($errorDetail);
+
+        ldap_unbind($connection);
+        return false;
+    }
+
+    ldap_log("Login erfolgreich für '$bindRdn'.");
+    return $connection;
+}
\ No newline at end of file
diff --git a/public/404.html b/public/404.html
index c7c0b9f..c800213 100644
--- a/public/404.html
+++ b/public/404.html
@@ -111,7 +111,7 @@
                     data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -409,7 +409,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/blank.html b/public/blank.html
index fc9ecb7..9ad768d 100644
--- a/public/blank.html
+++ b/public/blank.html
@@ -110,7 +110,7 @@
                     data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -403,7 +403,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/buttons.html b/public/buttons.html
index 8af6edd..4795bbc 100644
--- a/public/buttons.html
+++ b/public/buttons.html
@@ -110,7 +110,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -578,7 +578,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/cards.html b/public/cards.html
index c95ef97..bf2a0f2 100644
--- a/public/cards.html
+++ b/public/cards.html
@@ -110,7 +110,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -572,7 +572,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/charts.html b/public/charts.html
index ab0eba2..e439f8f 100644
--- a/public/charts.html
+++ b/public/charts.html
@@ -109,7 +109,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -463,7 +463,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/forgot-password.html b/public/forgot-password.html
index 5f198c1..fe51c05 100644
--- a/public/forgot-password.html
+++ b/public/forgot-password.html
@@ -49,7 +49,7 @@
                                                 id="exampleInputEmail" aria-describedby="emailHelp"
                                                 placeholder="Enter Email Address...">
                                         </div>
-                                        <a href="login.html" class="btn btn-primary btn-user btn-block">
+                                        <a href="login.php" class="btn btn-primary btn-user btn-block">
                                             Reset Password
                                         </a>
                                     </form>
@@ -58,7 +58,7 @@
                                         <a class="small" href="register.html">Create an Account!</a>
                                     </div>
                                     <div class="text-center">
-                                        <a class="small" href="login.html">Already have an account? Login!</a>
+                                        <a class="small" href="login.php">Already have an account? Login!</a>
                                     </div>
                                 </div>
                             </div>
diff --git a/public/index.html b/public/index.html
index a95a311..fbadaf5 100644
--- a/public/index.html
+++ b/public/index.html
@@ -109,7 +109,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -731,7 +731,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/login.html b/public/login.php
similarity index 63%
rename from public/login.html
rename to public/login.php
index f4fa58e..f6fd1e8 100644
--- a/public/login.html
+++ b/public/login.php
@@ -1,3 +1,35 @@
+<?php
+session_start();
+require_once __DIR__ . '/../config/ldap.php';
+
+$error = "";
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    var_dump($_POST);
+    $username = isset($_POST['username']) ? trim($_POST['username']) : "";
+    $password = isset($_POST['password']) ? $_POST['password'] : "";
+
+    $ldapConn = ldap_authenticate($username, $password);
+
+    if ($ldapConn === false) {
+        $error = "Anmeldung fehlgeschlagen. Benutzername oder Passwort falsch.";
+    } else {
+        // Optional: User-Infos aus AD lesen, z. B. displayName
+        // $result = ldap_search($ldapConn, $LDAP_BASE_DN, "(sAMAccountName=$username)", ["displayName"]);
+        // $entries = ldap_get_entries($ldapConn, $result);
+
+        $_SESSION['logged_in'] = true;
+        $_SESSION['username']  = $username;
+        // $_SESSION['displayName'] = $entries[0]['displayname'][0] ?? $username;
+
+        ldap_unbind($ldapConn);
+
+        header("Location: dashboard.php");
+        exit();
+    }
+}
+?>
+
 <!DOCTYPE html>
 <html lang="en">
 
@@ -41,15 +73,20 @@
                                     <div class="text-center">
                                         <h1 class="h4 text-gray-900 mb-4">Welcome Back!</h1>
                                     </div>
-                                    <form class="user">
+                                    <?php if ($error !== ""): ?>
+                                        <div class="alert alert-danger" role="alert">
+                                            <?php echo htmlspecialchars($error); ?>
+                                        </div>
+                                    <?php endif; ?>
+                                    <form class="user" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
                                         <div class="form-group">
-                                            <input type="email" class="form-control form-control-user"
-                                                id="exampleInputEmail" aria-describedby="emailHelp"
-                                                placeholder="Enter Email Address...">
+                                            <input type="text" name="username" class="form-control form-control-user"
+                                                id="username" aria-describedby="usernameHelp"
+                                                placeholder="Enter Username...">
                                         </div>
                                         <div class="form-group">
-                                            <input type="password" class="form-control form-control-user"
-                                                id="exampleInputPassword" placeholder="Password">
+                                            <input type="password" name="password"  class="form-control form-control-user"
+                                                id="password" placeholder="Password">
                                         </div>
                                         <div class="form-group">
                                             <div class="custom-control custom-checkbox small">
@@ -58,16 +95,9 @@
                                                     Me</label>
                                             </div>
                                         </div>
-                                        <a href="index.html" class="btn btn-primary btn-user btn-block">
-                                            Login
-                                        </a>
-                                        <hr>
-                                        <a href="index.html" class="btn btn-google btn-user btn-block">
-                                            <i class="fab fa-google fa-fw"></i> Login with Google
-                                        </a>
-                                        <a href="index.html" class="btn btn-facebook btn-user btn-block">
-                                            <i class="fab fa-facebook-f fa-fw"></i> Login with Facebook
-                                        </a>
+                                        <button type="submit" class="btn btn-primary btn-user btn-block">
+                                            Anmelden
+                                        </button>
                                     </form>
                                     <hr>
                                     <div class="text-center">
diff --git a/public/register.html b/public/register.html
index a005eb6..fe79171 100644
--- a/public/register.html
+++ b/public/register.html
@@ -61,7 +61,7 @@
                                             id="exampleRepeatPassword" placeholder="Repeat Password">
                                     </div>
                                 </div>
-                                <a href="login.html" class="btn btn-primary btn-user btn-block">
+                                <a href="login.php" class="btn btn-primary btn-user btn-block">
                                     Register Account
                                 </a>
                                 <hr>
@@ -77,7 +77,7 @@
                                 <a class="small" href="forgot-password.html">Forgot Password?</a>
                             </div>
                             <div class="text-center">
-                                <a class="small" href="login.html">Already have an account? Login!</a>
+                                <a class="small" href="login.php">Already have an account? Login!</a>
                             </div>
                         </div>
                     </div>
diff --git a/public/tables.html b/public/tables.html
index c6da245..3e4e898 100644
--- a/public/tables.html
+++ b/public/tables.html
@@ -112,7 +112,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -901,7 +901,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/utilities-animation.html b/public/utilities-animation.html
index c406800..fa2f124 100644
--- a/public/utilities-animation.html
+++ b/public/utilities-animation.html
@@ -109,7 +109,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -503,7 +503,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/utilities-border.html b/public/utilities-border.html
index 828c2cd..fb71b22 100644
--- a/public/utilities-border.html
+++ b/public/utilities-border.html
@@ -109,7 +109,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -505,7 +505,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/utilities-color.html b/public/utilities-color.html
index 41ace58..b7cdf30 100644
--- a/public/utilities-color.html
+++ b/public/utilities-color.html
@@ -109,7 +109,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -491,7 +491,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>
diff --git a/public/utilities-other.html b/public/utilities-other.html
index c14e6bb..f64351f 100644
--- a/public/utilities-other.html
+++ b/public/utilities-other.html
@@ -109,7 +109,7 @@
                 <div id="collapsePages" class="collapse" aria-labelledby="headingPages" data-parent="#accordionSidebar">
                     <div class="bg-white py-2 collapse-inner rounded">
                         <h6 class="collapse-header">Login Screens:</h6>
-                        <a class="collapse-item" href="login.html">Login</a>
+                        <a class="collapse-item" href="login.php">Login</a>
                         <a class="collapse-item" href="register.html">Register</a>
                         <a class="collapse-item" href="forgot-password.html">Forgot Password</a>
                         <div class="collapse-divider"></div>
@@ -485,7 +485,7 @@
                 <div class="modal-body">Select "Logout" below if you are ready to end your current session.</div>
                 <div class="modal-footer">
                     <button class="btn btn-secondary" type="button" data-dismiss="modal">Cancel</button>
-                    <a class="btn btn-primary" href="login.html">Logout</a>
+                    <a class="btn btn-primary" href="login.php">Logout</a>
                 </div>
             </div>
         </div>