프리미엄 무료 모델

<div class="free"><div class="flow" id="flow"></div><div class="labels"><span>FREE ZONE</span><span>UPGRADE ZONE</span></div><label>FREE LIMIT <b id="lim">5</b><input id="limit" type="range" min="2" max="10" value="5"></label><div class="note" id="note">3 users reach the upgrade point</div></div>

.free{width:min(92%,580px);font:900 clamp(10px,max(2vmin,1vw),14px)/1.2 sans-serif}.flow{display:flex;gap:3px;height:clamp(64px,20vmin,128px);align-items:end}.flow i{flex:1;background:var(--accent);height:55%;transition:.3s}.flow i.paid{background:var(--accent-2);height:85%}.labels{display:flex;justify-content:space-between;margin-top:8px;color:var(--muted)}label{display:block;margin-top:clamp(12px,3vmin,20px)}label b{float:right;color:var(--accent)}input{display:block;width:100%;accent-color:var(--accent)}.note{text-align:center;background:var(--surface);border:1px solid var(--line);padding:8px}@media(min-width:700px){body>:first-child{transform:scale(1.25);transform-origin:center}}

const use=[1,2,3,4,5,6,7,8,9,10,11,12],box=document.querySelector('#flow');box.innerHTML=use.map(()=>'<i></i>').join('');const r=document.querySelector('#limit');function draw(){const lim=+r.value;document.querySelector('#lim').textContent=lim;document.querySelectorAll('#flow i').forEach((e,i)=>e.classList.toggle('paid',use[i]>lim));document.querySelector('#note').textContent=(use.filter(n=>n>lim).length)+' users reach the upgrade point'}r.oninput=draw;draw();setTimeout(()=>{r.value=8;draw()},650);setTimeout(()=>{r.value=5;draw()},2600);