// Keep a live measurement of the visual viewport for mobile browsers whose
// address bar or software keyboard does not resize the layout viewport. CSS
// combines this value with 100svh, so address-bar animation cannot make the
// ticket shell jump while a genuinely smaller keyboard viewport still fits.
(()=>{
  let frame=0;
  const syncViewport=()=>{
    frame=0;
    const viewport=window.visualViewport;
    const height=Math.max(1,Math.round(viewport?.height||window.innerHeight));
    const offsetTop=Math.max(0,Math.round(viewport?.offsetTop||0));
    const root=document.documentElement;
    root.style.setProperty('--visual-viewport-height',`${height}px`);
    root.style.setProperty('--visual-viewport-offset-top',`${offsetTop}px`);
    window.dispatchEvent(new CustomEvent('appviewportchange',{detail:{height,offsetTop}}));
  };
  const scheduleViewportSync=()=>{if(!frame)frame=requestAnimationFrame(syncViewport)};
  syncViewport();
  window.visualViewport?.addEventListener('resize',scheduleViewportSync,{passive:true});
  window.visualViewport?.addEventListener('scroll',scheduleViewportSync,{passive:true});
  window.addEventListener('resize',scheduleViewportSync,{passive:true});
  window.addEventListener('orientationchange',()=>setTimeout(scheduleViewportSync,120),{passive:true});
})();

document.addEventListener('submit',event=>{
  const form=event.target;if(!form.matches('form'))return;
  requestAnimationFrame(()=>{if(!form.checkValidity())return;form.querySelectorAll('button[type="submit"],button:not([type])').forEach(button=>{button.disabled=true;button.setAttribute('aria-busy','true');if(!button.dataset.label)button.dataset.label=button.textContent;button.textContent='در حال ثبت…'})});
});
document.querySelectorAll('.flash').forEach(flash=>{
  const close=document.createElement('button');close.type='button';close.className='flash-close';close.setAttribute('aria-label','بستن پیام');close.textContent='×';close.addEventListener('click',()=>flash.remove());flash.appendChild(close);
  if(flash.classList.contains('success'))setTimeout(()=>{flash.classList.add('flash-leaving');setTimeout(()=>flash.remove(),250)},7000);
});