Prevent iOS double-tap zoom

index.html

@@ -25,6 +25,7 @@
 }
 *{box-sizing:border-box}
 html,body{margin:0;padding:0}
+html{touch-action:manipulation}
 body{
   background:var(--bg);
   color:var(--txt);
@@ -38,6 +39,7 @@ body{
     linear-gradient(90deg, rgba(0,240,255,.028) 1px, transparent 1px);
   background-size:32px 32px;
 }
+button,input,select,.chip,.stepper,.quick-summary{touch-action:manipulation}
 .wrap{max-width:760px;margin:0 auto;padding:0 14px}
 
 /* ---------- Kopf ---------- */
@@ -1195,6 +1197,15 @@ function copyText(){
 window.addEventListener("hashchange",()=>{ if(!hashLock){ readHash(); render(); }});
 setInterval(()=>{ if(lastR) renderTimeline(lastR); }, 30000);
 
+/* iOS Safari zoomt sonst bei schnellem Doppeltippen auf Buttons/Slider.
+   Pinch-Zoom bleibt unberührt; verhindert wird nur der Double-Tap-Default. */
+let lastTouchEnd = 0;
+document.addEventListener("touchend", e=>{
+  const now = Date.now();
+  if (now - lastTouchEnd <= 320) e.preventDefault();
+  lastTouchEnd = now;
+}, {passive:false});
+
 /* ---------- Start ---------- */
 readHash();
 initUI();