Price elasticity

<div class="el"><div class="chart"><svg viewBox="0 0 300 140" preserveAspectRatio="none"><path d="M8 20 Q145 36 292 127" fill="none" stroke="var(--accent)" stroke-width="4"/><path d="M8 125 Q145 39 292 109" fill="none" stroke="var(--accent-3)" stroke-width="3" stroke-dasharray="5 4"/><line id="needle" x1="120" x2="120" y1="5" y2="135" stroke="var(--fg)" stroke-width="2"/></svg><span>DEMAND</span><span>REVENUE</span></div><div class="metric"><label>PRICE <b id="p">$40</b></label><input id="pr" type="range" min="20" max="80" value="40"><div>UNITS <b id="u">80</b> · SALES <b id="s">$3,200</b></div></div></div>

.el{width:min(92%,620px);font:800 clamp(10px,max(2vmin,1vw),14px)/1.2 sans-serif}.chart{position:relative;height:clamp(75px,24vmin,150px);border-bottom:2px solid var(--line)}svg{width:100%;height:100%}.chart span{position:absolute;bottom:3px;color:var(--muted)}.chart span:nth-of-type(1){left:2%;color:var(--accent)}.chart span:nth-of-type(2){right:2%;color:var(--accent-3)}.metric{margin-top:12px}.metric label{display:flex;justify-content:space-between}.metric label b{font-size:clamp(16px,4vmin,30px);color:var(--accent)}input{width:100%;accent-color:var(--accent)}.metric>div{text-align:right;color:var(--muted)}.metric>div b{color:var(--fg)}@media(min-width:700px){body>:first-child{transform:scale(1.25);transform-origin:center}}

const r=document.querySelector('#pr');function draw(){const p=+r.value,u=Math.round(120-p);document.querySelector('#p').textContent='$'+p;document.querySelector('#u').textContent=u;document.querySelector('#s').textContent='$'+(p*u).toLocaleString();const x=8+(p-20)/60*284;document.querySelector('#needle').setAttribute('x1',x);document.querySelector('#needle').setAttribute('x2',x)}r.oninput=draw;draw();setTimeout(()=>{r.value=65;draw()},650);setTimeout(()=>{r.value=40;draw()},2600);