document.addEventListener("DOMContentLoaded", function () { /* Find all step animation sections */ const sections = document.querySelectorAll(".steps-animation"); sections.forEach(function (section) { /* Find all steps with the new class */ const steps = section.querySelectorAll(".step-item-b"); /* Stop if no steps are found */ if (!steps.length) return; let currentStep = 0; let animationStarted = false; let interval; /* Watch when the section enters the viewport */ const observer = new IntersectionObserver(function (entries) { entries.forEach(function (entry) { /* Start animation when section is visible */ if (entry.isIntersecting && !animationStarted) { animationStarted = true; function runAnimation() { /* Remove active class from all steps */ steps.forEach(function (step) step.classList.remove("active"); ); /* Add active class to current step */ steps[currentStep].classList.add("active"); /* Move to the next step */ currentStep++; /* Return to the first step after the last one */ if (currentStep >= steps.length) currentStep = 0; } /* Run first step immediately */ runAnimation(); /* Change active step every 2 seconds */ interval = setInterval(runAnimation, 2000); } }); }, threshold: 0.4 ); /* Start observing this section */ observer.observe(section); }); });