document.getElementById(“startBtn”).addEventListener(“click”, function() {
// Show AdSense Ad
document.getElementById(“adsense-container”).style.display = “block”;

// Hide Start button
this.style.display = “none”;

// Show Timer
document.getElementById(“timerBox”).style.display = “block”;

let timeLeft = 30; // change to 60 for 1 min
let timer = setInterval(function() {
timeLeft–;
document.getElementById(“timer”).textContent = timeLeft;

if(timeLeft <= 0) {
clearInterval(timer);
document.getElementById("timerBox").style.display = "none";
document.getElementById("downloadBtn").style.display = "inline-block";
}
}, 1000);
});