교차 채널 개인화

<div class="channels"><div class="pref">PREFERENCE: <b id="pref">TRAVEL</b></div><div class="cards"><div><small>EMAIL</small><strong>TRAVEL</strong></div><div><small>PUSH</small><strong>TRAVEL</strong></div><div><small>IN-APP</small><strong>TRAVEL</strong></div></div></div>

.channels{width:min(92%,640px);font:900 clamp(10px,max(1.6vmin,1vw),14px)/1.1 sans-serif}.pref{padding:clamp(9px,2vmin,18px);background:var(--fg);color:var(--bg);text-align:center}.pref b{color:var(--accent-2)}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(5px,1.5vmin,13px);margin-top:clamp(14px,4vmin,30px)}.cards div{min-width:0;border:2px solid var(--accent);padding:clamp(9px,2vmin,18px);transition:.5s}.cards div.flash{background:var(--accent);color:#fff}.cards small{display:block;opacity:.65}.cards strong{display:block;font-size:clamp(10px,max(2.5vmin,1vw),22px);margin-top:clamp(12px,3vmin,26px)}small{font-size:max(.833em,10px,1vw)}

let home=false;function show(){const value=home?'HOME':'TRAVEL';document.querySelector('#pref').textContent=value;document.querySelectorAll('.cards div').forEach((el,i)=>{el.querySelector('strong').textContent=value;el.classList.add('flash');setTimeout(()=>el.classList.remove('flash'),500+i*150)});home=!home}show();setInterval(show,2300);