Test agent planner

<div class="stage"><div class="title">TEST AGENT · PLAN</div><div class="canvas"><div class="appmap"><div id="screen0">HOME</div><div id="screen1">FORM</div><div id="screen2">LIST</div></div><div class="scan" id="scan"></div><div class="plans"><div id="plan0">Open form</div><div id="plan1">Submit item</div><div id="plan2">Verify list</div></div></div></div>

.stage{width:min(94vw,820px);height:min(88vh,330px);box-sizing:border-box;padding:clamp(9px,2.4vmin,18px);border:1px solid var(--line);border-radius:13px;background:var(--surface);display:flex;flex-direction:column;gap:clamp(7px,2vmin,14px);font:600 clamp(12px,2.5vmin,16px)/1.28 "Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo",sans-serif;color:var(--fg);overflow:hidden}.title{color:var(--accent);letter-spacing:.035em;flex:none}.canvas{position:relative;flex:1;min-height:0;display:flex;align-items:center;justify-content:center}.muted{color:var(--muted)}.mono{font-family:ui-monospace,SFMono-Regular,monospace}.box{border:1px solid var(--line);border-radius:8px;background:var(--bg);padding:clamp(5px,1.4vmin,12px);text-align:center}.active{border-color:var(--accent)!important;color:var(--accent)!important;background:color-mix(in srgb,var(--accent) 12%,var(--surface))!important}.canvas{flex-direction:column;gap:clamp(9px,3vmin,17px)}.appmap,.plans{display:flex;width:100%;max-width:600px;gap:5px}.appmap div,.plans div{flex:1;border:1px solid var(--line);border-radius:5px;text-align:center;padding:clamp(6px,2vmin,12px) 1px}.appmap .on,.plans .on{border-color:var(--accent);color:var(--accent)}.plans div{opacity:.3;transition:opacity .3s}.plans .on{opacity:1}.scan{height:3px;width:20%;background:var(--accent);align-self:flex-start;margin-left:7%;transition:margin-left .5s}

let n=0;function scan(){const step=n++%3;for(let i=0;i<3;i++){document.getElementById('screen'+i).classList.toggle('on',i===step);document.getElementById('plan'+i).classList.toggle('on',i<=step)}document.getElementById('scan').style.marginLeft=[7,40,73][step]+'%'}scan();setInterval(scan,850)