diff --git a/404.php b/404.php
new file mode 100644
index 0000000..790c806
--- /dev/null
+++ b/404.php
@@ -0,0 +1,102 @@
+<?php
+// Wichtig: echten 404-Status setzen
+http_response_code(404);
+
+// Request-Daten absichern
+$requestUri = htmlspecialchars($_SERVER['REQUEST_URI'] ?? '', ENT_QUOTES, 'UTF-8');
+$method     = htmlspecialchars($_SERVER['REQUEST_METHOD'] ?? '', ENT_QUOTES, 'UTF-8');
+$ip         = htmlspecialchars($_SERVER['REMOTE_ADDR'] ?? '', ENT_QUOTES, 'UTF-8');
+
+// Optional: einfaches Logging
+error_log("[404] $ip $method $requestUri");
+?>
+<!DOCTYPE html>
+<html lang="de">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>404 – Seite nicht gefunden</title>
+
+    <style>
+        :root {
+            --bg: #0f172a;
+            --card: #1e293b;
+            --accent: #3b82f6;
+            --text: #e2e8f0;
+            --muted: #94a3b8;
+        }
+
+        body {
+            margin: 0;
+            font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
+            background: linear-gradient(135deg, #0f172a, #1e293b);
+            color: var(--text);
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            height: 100vh;
+        }
+
+        .card {
+            background: var(--card);
+            padding: 3rem;
+            border-radius: 16px;
+            box-shadow: 0 20px 40px rgba(0,0,0,0.4);
+            max-width: 500px;
+            width: 90%;
+            text-align: center;
+        }
+
+        h1 {
+            font-size: 4rem;
+            margin: 0;
+            color: var(--accent);
+        }
+
+        p {
+            color: var(--muted);
+            margin: 1rem 0;
+        }
+
+        a {
+            display: inline-block;
+            margin-top: 1.5rem;
+            padding: 0.75rem 1.5rem;
+            border-radius: 8px;
+            background: var(--accent);
+            color: white;
+            text-decoration: none;
+            font-weight: 600;
+            transition: 0.2s ease;
+        }
+
+        a:hover {
+            background: #2563eb;
+            transform: translateY(-2px);
+        }
+
+        .footer {
+            margin-top: 2rem;
+            font-size: 0.8rem;
+            color: #64748b;
+        }
+    </style>
+</head>
+
+<body>
+
+<div class="card">
+    <h1>404</h1>
+    <p>Die angeforderte Seite wurde nicht gefunden.</p>
+    <p><strong><?php echo $requestUri; ?></strong></p>
+
+    <a href="/">Zur Startseite</a>
+
+    <div class="footer">
+        Anfrage: <?php echo $method; ?> <br>
+        Server: fabianschieder.com
+    </div>
+</div>
+
+</body>
+</html>
\ No newline at end of file
