Blue-green deployment

<div class="stage" data-phase="0"><div class="title">TRAFFIC SWITCH</div><div class="route">REQUESTS <span></span></div><div class="row environments"><div class="panel blue">BLUE<br>v1</div><div class="panel green">GREEN<br>v2</div></div><div class="sub">verify green, then switch the route</div></div>

.stage{width:min(94vw,760px);height:min(88vh,330px);padding:clamp(9px,2.6vmin,20px);border:1px solid var(--line);border-radius:14px;background:var(--surface);font:600 clamp(12px,2.5vmin,16px)/1.3 "Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo",sans-serif;display:flex;flex-direction:column;gap:clamp(6px,1.7vmin,12px);overflow:hidden;position:relative}.stage *{min-width:0}.stage .title{color:var(--accent);font-weight:800}.stage .sub{color:var(--muted)}.stage .row{display:flex;align-items:center;gap:clamp(5px,1.6vmin,12px)}.stage .panel{border:1px solid var(--line);border-radius:8px;background:var(--bg);padding:clamp(6px,1.6vmin,12px)}.stage .mono{font-family:ui-monospace,SFMono-Regular,monospace;font-size:clamp(12px,2.5vmin,15px)}.stage .grow{flex:1}.stage .on{color:var(--accent)}.route{text-align:center;color:var(--accent)}.route span:after{content:'↙';display:inline-block;font-size:clamp(22px,5vmin,40px);transition:transform .4s}.environments{flex:1;justify-content:center}.environments .panel{width:38%;height:80%;display:grid;place-items:center;text-align:center}.blue{border-color:var(--accent-2)!important;background:color-mix(in srgb,var(--accent-2) 14%,var(--surface))!important}.green{border-color:var(--accent)!important}.stage[data-phase="1"] .green{background:color-mix(in srgb,var(--accent) 15%,var(--surface))}.stage[data-phase="2"] .route span:after{content:'↘'}.stage[data-phase="2"] .green{background:color-mix(in srgb,var(--accent) 29%,var(--surface));box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 20%,transparent)}

const stage=document.querySelector('.stage');let phase=0;function advance(){phase=(phase+1)%3;stage.dataset.phase=String(phase)}const timer=setInterval(advance,1200);stage.addEventListener('pointerdown',()=>{clearInterval(timer);advance()})