diff --git a/index.html b/index.html
index 2edd6d9..66c7c06 100644
--- a/index.html
+++ b/index.html
@@ -67,6 +67,12 @@
 
     .sidebar-col { position: sticky; top: 20px; height: fit-content; }
     .login-panel { background: var(--gray1); padding: 32px; border-radius: 16px; border: 1px solid var(--gray2); }
+    .notebook { background: var(--white); border-radius: 16px; overflow: hidden; box-shadow: 0 4px 12px rgba(0,0,0,.1); }
+    .notebook .tabs { display: flex; border-bottom: 2px solid var(--gray2); }
+    .notebook .tab { flex: 1; padding: 14px; text-align: center; font-weight: 600; cursor: pointer; border: none; background: #f9fafb; color: #6b7280; }
+    .notebook .tab.active { background: var(--white); color: var(--black); border-bottom: 3px solid var(--blue); }
+    .notebook .tab-content { padding: 24px; min-height: 200px; }
+    .notebook .hidden { display: none; }
     .login-panel h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid var(--gray2); }
     .form-group { margin-bottom: 16px; }
     .form-group label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; }
@@ -113,7 +119,7 @@
     </div>
   </header>
 
-  <section class="intro">
+  <section class="intro" id="intro-section">
     <p class="hide-de">Willkommen in der Gruppe Paraguay LLC & SRL! Diese Gruppe dient dem Austausch von Menschen, die in Paraguay eine LLC oder SRL betreiben oder sich damit beschäftigen.</p>
     <p class="hide-en">Welcome to the Paraguay LLC & SRL group! This group serves as an exchange platform for people who run or are engaged with an LLC or SRL in Paraguay.</p>
   </section>
@@ -193,7 +199,7 @@
         </div>
       </div>
 
-      <aside class="sidebar-col">
+      <aside class="sidebar-col hidden" id="login-panel">
         <div class="login-panel">
           <h3 class="hide-de">Anmeldung</h3>
           <h3 class="hide-en">Login</h3>
@@ -238,6 +244,33 @@
 
         </div>
       </aside>
+
+      <aside class="sidebar-col hidden" id="notebook-panel">
+        <div class="notebook">
+          <div class="tabs">
+            <button class="tab active" data-tab="users">
+              <span class="hide-de">Mitglieder</span>
+              <span class="hide-en">Members</span>
+            </button>
+            <button class="tab" data-tab="wiki">
+              <span class="hide-de">Wiki</span>
+              <span class="hide-en">Wiki</span>
+            </button>
+          </div>
+          <div class="tab-content" id="tab-users">
+            <h3 class="hide-de">Mitglieder</h3>
+            <h3 class="hide-en">Members</h3>
+            <p class="hide-de">Hier werden in Kürze alle Community-Mitglieder angezeigt.</p>
+            <p class="hide-en">All community members will be displayed here soon.</p>
+          </div>
+          <div class="tab-content hidden" id="tab-wiki">
+            <h3 class="hide-de">Wiki</h3>
+            <h3 class="hide-en">Wiki</h3>
+            <p class="hide-de">Hier finden Sie nützliche Informationen zu LLC/SRL in Paraguay.</p>
+            <p class="hide-en">Useful information about LLC/SRL in Paraguay can be found here.</p>
+          </div>
+        </div>
+      </aside>
     </div>
   </main>
 
@@ -250,6 +283,16 @@
   </footer>
 
   <script>
+    function checkSession() {
+      const sessionid = getCookie('sessionid');
+      if (sessionid) {
+        document.getElementById('intro-section').classList.add('hidden');
+        document.getElementById('news-col').classList.add('hidden');
+        document.getElementById('login-panel').classList.add('hidden');
+        document.getElementById('notebook-panel').classList.remove('hidden');
+      }
+    }
+
     document.querySelectorAll('.lang-btn').forEach(btn => {
       btn.addEventListener('click', () => {
         const lang = btn.dataset.lang;
@@ -297,6 +340,16 @@
       }
     }
 
+    document.querySelectorAll('.notebook .tab').forEach(tab => {
+      tab.addEventListener('click', () => {
+        document.querySelectorAll('.notebook .tab').forEach(t => t.classList.remove('active'));
+        tab.classList.add('active');
+        const tabName = tab.dataset.tab;
+        document.querySelectorAll('.notebook .tab-content').forEach(c => c.classList.add('hidden'));
+        document.getElementById('tab-' + tabName).classList.remove('hidden');
+      });
+    });
+
     function getCookie(name) {
       const value = `; ${document.cookie}`;
       const parts = value.split(`; ${name}=`);
@@ -365,6 +418,7 @@
     }
 
 
+    checkSession();
   </script>
 </body>
 </html>
\ No newline at end of file