여러 표면을 오가는 발견

<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>

.surfaces{width:min(93%,790px);display:grid;gap:clamp(8px,2vmin,17px);font:800 clamp(10px,max(1.8vmin,1vw),16px)/1.2 sans-serif}.surfaces-top{display:flex;justify-content:space-between}.surfaces-top span{color:var(--accent)}.surfaces-chain{display:flex;align-items:center}.surfaces-chain div{flex:1;min-width:0;text-align:center;padding:clamp(8px,2.3vmin,19px) 1px;border:2px solid var(--line);background:var(--surface);color:var(--muted);transition:.4s}.surfaces-chain div.on{border-color:var(--accent);background:var(--accent-2);color:#211b19}.surfaces-chain i{flex:0 0 2%;height:2px;background:var(--line)}.surfaces-panel{display:flex;align-items:baseline;gap:clamp(6px,1.7vmin,14px);border-left:4px solid var(--accent);padding:clamp(7px,1.7vmin,15px);background:var(--surface)}.surfaces-panel small{color:var(--accent);font-size:clamp(10px,max(1.5vmin,1vw),12px)}.surfaces-panel strong{font-size:clamp(12px,max(2.2vmin,1.2vw),20px)}.surfaces-panel span{margin-left:auto;color:var(--muted);font-size:clamp(10px,max(1.5vmin,1vw),12px)}.surfaces button{justify-self:end;background:var(--fg);color:var(--bg);border:0;padding:clamp(5px,1.3vmin,10px);font:inherit;cursor:pointer}

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);