Added full user authentication system: register/login with validation, bcrypt, reCAPTCHA integration, session handling, and new landing page with animated form switcher.

inc/css/style.css

@@ -151,3 +151,29 @@ button + button {
     white-space: pre-wrap;
     word-wrap: break-word;
 }
+
+.auth-box {
+    max-width: 400px;
+    margin: auto;
+    padding: 20px;
+    border-radius: 10px;
+    background: #fff;
+    transition: all 0.5s ease;
+    box-shadow: 0 0 10px rgba(0,0,0,0.1);
+}
+.auth-box.hidden {
+    display: none;
+}
+.auth-box h2 {
+    text-align: center;
+}
+.auth-box .error {
+    color: red;
+    text-align: center;
+    margin-bottom: 10px;
+}
+.auth-box input, .auth-box button {
+    display: block;
+    width: 100%;
+    margin: 10px 0;
+}