Cross-surface discovery

<div class="surfaces"><div class="surfaces-top"><b>ONE QUESTION</b><span id="surfaces-counter">STEP 1 / 4</span></div><div class="surfaces-chain"><div>AI</div><i></i><div>SEARCH</div><i></i><div>REVIEWS</div><i></i><div>SOCIAL</div></div><div class="surfaces-panel"><small id="surfaces-action">ASK</small><strong id="surfaces-answer">GET A SHORTLIST</strong><span>VERIFY ACROSS SURFACES</span></div><button id="surfaces-next" type="button">TRACE NEXT →</button></div>

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const nodes=[...document.querySelectorAll('.surfaces-chain div')],actions=[['ASK','GET A SHORTLIST'],['VERIFY','CHECK PRODUCT FACTS'],['TRUST','READ RECENT REVIEWS'],['CONFIRM','SEE REAL USE']];let step=0;function show(){nodes.forEach((n,i)=>n.classList.toggle('on',i<=step));document.getElementById('surfaces-counter').textContent='STEP '+(step+1)+' / 4';document.getElementById('surfaces-action').textContent=actions[step][0];document.getElementById('surfaces-answer').textContent=actions[step][1]}document.getElementById('surfaces-next').onclick=()=>{clearInterval(auto);step=(step+1)%4;show()};show();const auto=setInterval(()=>{step=(step+1)%4;show()},1100);