diff --git a/static/js/app.js b/static/js/app.js
index 9723b8e..2a9bd8f 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -79,16 +79,26 @@ const Globe = {
         // Stats Update
         this._statsInterval = setInterval(function() { Globe._updateStats(); }, 5000);
 
-        // Layer starten (die mit checked)
-
         this._toggleLabels(true);
         if (typeof VisualModes !== 'undefined') VisualModes.init();
         if (typeof Sidebar !== 'undefined') Sidebar.init();
         if (typeof ImagerySwitch !== 'undefined') ImagerySwitch.init(this.viewer);
         if (typeof SearchUI !== 'undefined') SearchUI.init();
         this._loadLagen();
-        document.getElementById('bottom-stats').textContent = 'Globe initialisiert — Lade Daten...';
-// Gruppen auf-/zuklappen        document.querySelectorAll(".layer-group-header").forEach(function(header) {            header.addEventListener("click", function() {                var group = document.getElementById(this.dataset.group);                group.classList.toggle("open");                var chevron = this.querySelector(".layer-group-chevron");                chevron.innerHTML = group.classList.contains("open") ? "▾" : "▸";            });        });
+        document.getElementById('bottom-stats').textContent = 'Globe initialisiert \u2014 Lade Daten...';
+
+        // Gruppen auf-/zuklappen
+        var groupHeaders = document.querySelectorAll('.layer-group-header');
+        for (var i = 0; i < groupHeaders.length; i++) {
+            groupHeaders[i].addEventListener('click', function() {
+                var groupId = this.getAttribute('data-group');
+                var group = document.getElementById(groupId);
+                if (!group) return;
+                var isOpen = group.classList.toggle('open');
+                var chevron = this.querySelector('.layer-group-chevron');
+                if (chevron) chevron.textContent = isOpen ? '\u25BE' : '\u25B8';
+            });
+        }
     },
 
     _toggleLabels(on) {
@@ -222,8 +232,25 @@ const Globe = {
         if (parts.length) {
             document.getElementById('bottom-stats').textContent = parts.join('  |  ');
         }
+
+        // Gruppen-Zaehler aktualisieren
+        var groups = {
+            'gcount-realtime': ['layer-flights', 'layer-military', 'layer-ships'],
+            'gcount-intel': ['layer-gdelt', 'layer-disasters', 'layer-firms'],
+            'gcount-geoint': ['layer-vlm', 'layer-nightlights', 'layer-celltowers'],
+            'gcount-infra': ['layer-satellites', 'layer-cables', 'layer-infra', 'layer-iss'],
+            'gcount-environ': ['layer-weather', 'layer-daynight', 'layer-terminator', 'layer-timezones'],
+        };
+        Object.keys(groups).forEach(function(countId) {
+            var ids = groups[countId];
+            var active = ids.filter(function(id) {
+                var cb = document.getElementById(id);
+                return cb && cb.checked;
+            }).length;
+            var el = document.getElementById(countId);
+            if (el) el.textContent = active + '/' + ids.length;
+        });
     },
-// Gruppen-Zaehler aktualisieren        var groups = {            "gcount-realtime": ["layer-flights","layer-military","layer-ships"],            "gcount-intel": ["layer-gdelt","layer-disasters","layer-firms"],            "gcount-geoint": ["layer-vlm","layer-nightlights","layer-celltowers"],            "gcount-infra": ["layer-satellites","layer-cables","layer-infra","layer-iss"],            "gcount-environ": ["layer-weather","layer-daynight","layer-terminator","layer-timezones"],        };        Object.keys(groups).forEach(function(countId) {            var ids = groups[countId];            var active = ids.filter(function(id) { var cb = document.getElementById(id); return cb && cb.checked; }).length;            var el = document.getElementById(countId);            if (el) el.textContent = active + "/" + ids.length;        });
 };
 
 document.addEventListener('DOMContentLoaded', function() { Globe.init(); });