조합형 마테크 스택

<div class="stack"><div class="apps"><span>APP A</span><span id="swap">APP B</span><span>AGENT</span></div><div class="links">│　│　│</div><div class="data">UNIVERSAL DATA LAYER</div><div class="caption">SWAP A MODULE · KEEP THE CORE</div></div>

.stack{width:min(88%,540px);font:900 clamp(10px,max(3.7vmin,1vw),16px)/1 sans-serif;text-align:center}.apps{display:flex;gap:clamp(5px,1.2vmin,12px)}.apps span{flex:1;padding:clamp(10px,2.5vmin,20px) 2px;border:2px solid var(--fg);background:var(--surface)}.apps span:nth-child(2){border-color:var(--accent);color:var(--accent);animation:replace 3s infinite}.links{font-size:clamp(18px,4vmin,34px);color:var(--accent);white-space:pre}.data{padding:clamp(15px,3vmin,26px);background:var(--fg);color:var(--bg);border-bottom:clamp(4px,1vmin,9px) solid var(--accent)}.caption{margin-top:clamp(10px,2vmin,18px);color:var(--muted);font-size:max(10px,1vw,.75em);letter-spacing:.08em}@keyframes replace{0%,25%,100%{opacity:1;transform:scale(1)}40%{opacity:.1;transform:scale(.85)}60%,85%{opacity:1;transform:scale(1);box-shadow:4px 4px 0 var(--accent)}}

const swap=document.querySelector('#swap');let alt=false;setInterval(()=>{alt=!alt;swap.textContent=alt?'APP C':'APP B'},3000);