diff --git a/modules/shared/auth/ui/home.php b/modules/shared/auth/ui/home.php
index 507821f..2688e70 100644
--- a/modules/shared/auth/ui/home.php
+++ b/modules/shared/auth/ui/home.php
@@ -924,7 +924,8 @@ function render_auth_home_page(array $user, array $otcProducts = [], array $otcM
     echo "  const heading = document.querySelector('[data-main-heading]');";
     echo "  if (heading && portalModuleHeadings[moduleName]) { heading.textContent = portalModuleHeadings[moduleName]; }";
     echo "};";
-    echo "const renderLeftNavigation = (moduleName) => {";
+    echo "const updatePortalLocation = (moduleName, entryName = '') => { const url = new URL(window.location.href); url.searchParams.set('portal_module', moduleName); if (entryName) { url.searchParams.set('portal_section', entryName); } else { url.searchParams.delete('portal_section'); } window.history.replaceState({ ...(window.history.state || {}), portalModule: moduleName, portalSection: entryName }, '', url); };";
+    echo "const renderLeftNavigation = (moduleName, requestedEntry = '') => {";
     echo "  const title = document.querySelector('[data-left-navigation-title]');";
     echo "  const contentTitle = document.querySelector('[data-left-navigation-content-title]');";
     echo "  const contentSection = document.querySelector('.sg-left-navigation-pattern__group-card--content');";
@@ -933,7 +934,7 @@ function render_auth_home_page(array $user, array $otcProducts = [], array $otcM
     echo "  if (title) { title.textContent = moduleName; }";
     echo "  if (!menu) { return; }";
     echo "  const entries = portalModuleNavigation[moduleName] || [];";
-    echo "  const activeEntry = entries[0] || '';";
+    echo "  const activeEntry = entries.includes(requestedEntry) ? requestedEntry : (entries[0] || '');";
     echo "  if (contentTitle) { contentTitle.textContent = activeEntry; }";
     echo "  if (contentSection) { contentSection.setAttribute('aria-hidden', 'false'); }";
     echo "  if (contentBody) { contentBody.innerHTML = portalModuleContentCards[activeEntry] || ''; }";
@@ -961,10 +962,11 @@ function render_auth_home_page(array $user, array $otcProducts = [], array $otcM
       echo "      if (contentTitle) { contentTitle.textContent = entryName; }";
       echo "      if (contentSection) { contentSection.setAttribute('aria-hidden', 'false'); }";
       echo "      if (contentBody) { contentBody.innerHTML = portalModuleContentCards[entryName] || ''; }";
-    echo "      if (entryName === 'Bestellungen') { initBestellungenBindings(); }";
-    echo "      if (entryName === 'Marktdurchführungen') { initMarketsBindings(); }";
-    echo "      if (entryName === 'Märkte') { initMarketDefinitionsBindings(); }";
-    echo "      if (entryName === 'Lager' || entryName === 'Artikel') { initLagerBindings(); }";
+      echo "      if (entryName === 'Bestellungen') { initBestellungenBindings(); }";
+      echo "      if (entryName === 'Marktdurchführungen') { initMarketsBindings(); }";
+      echo "      if (entryName === 'Märkte') { initMarketDefinitionsBindings(); }";
+      echo "      if (entryName === 'Lager' || entryName === 'Artikel') { initLagerBindings(); }";
+    echo "      updatePortalLocation(moduleName, entryName);";
     echo "    });";
     echo "  });";
     echo "};";
@@ -978,9 +980,11 @@ function render_auth_home_page(array $user, array $otcProducts = [], array $otcM
     echo "      });";
     echo "      renderMainHeading(button.textContent.trim());";
     echo "      renderLeftNavigation(button.textContent.trim());";
+    echo "      updatePortalLocation(button.textContent.trim());";
     echo "    });";
     echo "  });";
     echo "});";
+    echo "(() => { const url = new URL(window.location.href); const requestedModule = url.searchParams.get('portal_module') || 'ERP'; const moduleButton = Array.from(document.querySelectorAll('.sg-portal-header__tabs .sg-tab-button')).find((button) => button.textContent.trim() === requestedModule) || document.querySelector('.sg-portal-header__tabs .sg-tab-button'); if (!moduleButton) { return; } const moduleName = moduleButton.textContent.trim(); document.querySelectorAll('.sg-portal-header__tabs .sg-tab-button').forEach((button) => { const active = button === moduleButton; button.setAttribute('aria-selected', String(active)); button.dataset.componentState = active ? 'active' : 'inactive'; }); renderMainHeading(moduleName); renderLeftNavigation(moduleName, url.searchParams.get('portal_section') || ''); })();";
     echo "document.querySelectorAll('.sg-sandwich-menu-wrap').forEach((wrap) => {";
     echo "  const button = wrap.querySelector('.sg-sandwich-button');";
     echo "  button.addEventListener('click', (event) => {";