획득당비용 (CPA)

<div class="funnel"><div class="step"><span>AD SPEND</span><b>$600</b></div><div class="flow" id="clicks"></div><div class="step"><span>CONVERSIONS</span><b id="conversions">6</b></div><div class="result">CPA <strong id="cpa">$100</strong></div></div>

.funnel{width:min(86%,440px);font:800 clamp(10px,max(2vmin,1vw),16px)/1.2 sans-serif}.step{display:flex;justify-content:space-between;border:1px solid var(--line);background:var(--surface);padding:clamp(7px,2vmin,15px);color:var(--muted)}.step b{color:var(--fg)}.flow{height:clamp(38px,13vmin,95px);display:flex;align-items:center;justify-content:center;gap:clamp(3px,1vmin,8px);overflow:hidden}.flow i{display:block;width:clamp(7px,2vmin,16px);aspect-ratio:1;border-radius:50%;background:var(--accent-3);transition:.6s}.flow i.drop{transform:translateY(70px);opacity:0}.flow i.convert{background:var(--accent);transform:scale(1.25)}.result{margin-top:clamp(8px,2vmin,18px);display:flex;align-items:center;justify-content:space-between;border-top:2px solid var(--fg);padding-top:8px}.result strong{font-size:clamp(26px,8vmin,64px);color:var(--accent)}

const flow=document.querySelector('#clicks');flow.innerHTML=Array.from({length:12},()=>'<i></i>').join('');let step=0;function draw(){const count=[6,4,8,5][step++%4];[...flow.children].forEach((dot,i)=>{dot.className=i<count?'convert':'drop'});document.querySelector('#conversions').textContent=String(count);document.querySelector('#cpa').textContent='$'+(600/count).toFixed(0)}draw();setInterval(draw,1400);