document.addEventListener('DOMContentLoaded', ()=> {
const triggerDiv=document.querySelector('#bottom-blue-trigger');
const targetDiv=document.querySelector('#foto-wrapper-target');
if(!triggerDiv||!targetDiv) return;
const observer=new IntersectionObserver((entries)=> {
entries.forEach((entry)=> {
if(entry.isIntersecting){
targetDiv.classList.add('bottom');
}else{
targetDiv.classList.remove('bottom');
}});
}, { threshold: 0.6 });
observer.observe(triggerDiv);
});