diff --git a/web/themes/default/app.js b/web/themes/default/app.js
index 58c7845..494f1d7 100644
--- a/web/themes/default/app.js
+++ b/web/themes/default/app.js
@@ -339,39 +339,54 @@ function initPrinters(){
 // active printer via the dropdown re-evaluates has_power_control for the
 // newly active one instead of a fixed dashboard card tied to whichever
 // printer happened to be active on page load) ──
+// Single button showing the action a click would perform (not the current
+// state): printer on → button offers "Aus", printer off → button offers
+// "An". _headerPowerState holds the last known actual state ('on'/'off'/
+// null=unknown) so toggleHeaderPower() knows which action to send.
+var _headerPowerState=null;
 function _initHeaderPower(){
-  var wrap=document.getElementById('h-power-wrap');
-  if(!wrap)return;
-  if(!_activePrinter||!_activePrinter.has_power_control){wrap.style.display='none';return;}
-  wrap.style.display='flex';
+  var btn=document.getElementById('h-power-btn');
+  if(!btn)return;
+  if(!_activePrinter||!_activePrinter.has_power_control){btn.style.display='none';return;}
+  btn.style.display='';
   _refreshHeaderPower();
 }
+function _applyHeaderPowerState(state){
+  _headerPowerState=state;
+  var btn=document.getElementById('h-power-btn'), lbl=document.getElementById('h-power-lbl');
+  if(!btn||!lbl)return;
+  if(state==='on'){
+    btn.classList.remove('h-power-can-on');btn.classList.add('h-power-can-off');
+    lbl.textContent=T.printers_power_off_short||'Aus';
+  }else if(state==='off'){
+    btn.classList.remove('h-power-can-off');btn.classList.add('h-power-can-on');
+    lbl.textContent=T.printers_power_on_short||'An';
+  }else{
+    btn.classList.remove('h-power-can-on','h-power-can-off');
+    lbl.textContent=T.printers_power_on_short||'An';
+  }
+}
 function _refreshHeaderPower(){
   if(!_activePrinter||!_activePrinter.has_power_control)return;
   var bridgeUrl=(_activePrinter.bridge_url||'').replace(/\/+$/,'');
   fetch(bridgeUrl+'/kx/printers/'+encodeURIComponent(_activePrinter.id)+'/power-status',{signal:AbortSignal.timeout(5000)})
     .then(function(r){return r.json()})
-    .then(function(d){
-      var onBtn=document.getElementById('h-power-on'), offBtn=document.getElementById('h-power-off');
-      if(!onBtn||!offBtn)return;
-      onBtn.classList.toggle('spd-active',d.state==='on');
-      offBtn.classList.toggle('spd-active',d.state==='off');
-    })
-    .catch(function(){/* status endpoint optional - toggle just stays neutral */});
+    .then(function(d){_applyHeaderPowerState(d.state==='on'||d.state==='off'?d.state:null);})
+    .catch(function(){/* status endpoint optional - button just stays neutral */});
 }
-function setHeaderPower(action){
+function toggleHeaderPower(){
   if(!_activePrinter)return;
+  // Unknown current state: default to "on" - turning an already-off switch
+  // on is harmless, whereas guessing "off" on a printer mid-print is not.
+  var action=_headerPowerState==='on'?'off':'on';
   if(action==='off'&&!confirm(T.printers_power_off_confirm||'Turn printer power off? Make sure no print is running.'))return;
-  var onBtn=document.getElementById('h-power-on'), offBtn=document.getElementById('h-power-off');
-  if(onBtn)onBtn.style.opacity='0.5';
-  if(offBtn)offBtn.style.opacity='0.5';
+  var btn=document.getElementById('h-power-btn');
+  if(btn)btn.style.opacity='0.5';
   post('/kx/printers/'+encodeURIComponent(_activePrinter.id)+'/power',{action:action}).then(function(){
-    if(onBtn)onBtn.style.opacity='1';
-    if(offBtn)offBtn.style.opacity='1';
+    if(btn)btn.style.opacity='1';
     setTimeout(_refreshHeaderPower,1500);
   }).catch(function(e){
-    if(onBtn)onBtn.style.opacity='1';
-    if(offBtn)offBtn.style.opacity='1';
+    if(btn)btn.style.opacity='1';
     clog('Power-Fehler: '+e,'msg-err');
   });
 }
@@ -464,8 +479,6 @@ function applyLang(){
   setText('d-card-temps',T.card_temps);
   setText('d-card-lightfan',T.card_light_fan);
   setText('d-card-speed',T.card_speed);
-  setText('h-power-lbl-on',T.printers_power_on_short||'An');
-  setText('h-power-lbl-off',T.printers_power_off_short||'Aus');
   setText('d-card-cam',T.card_cam);
   setText('d-card-ams',T.panel_ams_title);
   setText('d-lbl-elapsed',T.lbl_elapsed);
diff --git a/web/themes/default/index.html b/web/themes/default/index.html
index e47a7f1..da31eb5 100644
--- a/web/themes/default/index.html
+++ b/web/themes/default/index.html
@@ -35,10 +35,9 @@
   </div>
   <div id="h-pname-single" class="hname">Anycubic Kobra X</div>
   <span id="h-version" style="font-size:11px;opacity:.5;margin-left:6px"></span>
-  <div id="h-power-wrap" style="display:none;margin-left:10px;gap:2px;background:var(--raised);border:1px solid var(--border);border-radius:6px;padding:2px" title="Steckdose">
-    <button id="h-power-on" class="h-power-btn" onclick="setHeaderPower('on')">🟢 <span id="h-power-lbl-on">An</span></button>
-    <button id="h-power-off" class="h-power-btn" onclick="setHeaderPower('off')">🔴 <span id="h-power-lbl-off">Aus</span></button>
-  </div>
+  <button id="h-power-btn" class="h-power-btn" style="display:none;margin-left:10px" onclick="toggleHeaderPower()" title="Steckdose">
+    🔌 <span id="h-power-lbl">An</span>
+  </button>
   <div class="hbadge" id="h-badge"><span class="dot"></span><span id="h-state">Standby</span></div>
   <button class="theme-btn" onclick="toggleTheme()">☀ / ☾</button>
   <button class="theme-btn" onclick="showPanel('settings')" id="settings-btn" title="Einstellungen">⚙</button>
diff --git a/web/themes/default/style.css b/web/themes/default/style.css
index c7e6853..1097f56 100644
--- a/web/themes/default/style.css
+++ b/web/themes/default/style.css
@@ -202,10 +202,14 @@ main{flex:1;overflow-y:auto;padding:20px}
 .spd-btn .spd-icon{font-size:22px}
 .spd-bar{height:4px;border-radius:2px;background:var(--border);margin-top:10px;overflow:hidden}
 .spd-bar-fill{height:100%;border-radius:2px;background:linear-gradient(90deg,var(--accent2),var(--accent));transition:width .3s}
-.h-power-btn{border:1.5px solid transparent;background:none;color:var(--txt2);
-  border-radius:5px;padding:3px 8px;font-size:12px;font-weight:600;cursor:pointer;transition:all .15s}
-.h-power-btn:hover{color:var(--txt)}
-.h-power-btn.spd-active{border-color:var(--accent);background:rgba(0,200,255,.12);color:var(--accent)}
+.h-power-btn{border:1.5px solid var(--border);background:var(--raised);color:var(--txt2);
+  border-radius:6px;padding:4px 10px;font-size:12px;font-weight:600;cursor:pointer;transition:all .15s}
+.h-power-btn:hover{opacity:.85}
+/* Shows the action a click would perform, not the current state - green
+   "An" while the printer is off (click turns it on), red "Aus" while it's
+   on (click turns it off). */
+.h-power-btn.h-power-can-on{border-color:var(--ok);background:rgba(76,222,128,.12);color:var(--ok)}
+.h-power-btn.h-power-can-off{border-color:var(--err);background:rgba(255,77,109,.12);color:var(--err)}
 
 /* ── TIME CARDS ── */
 .time-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:8px}