Pod user namespaces

<div class="stage" data-phase="0"><div class="title">USER ID MAPPING</div><div class="row mapping"><div class="panel">CONTAINER<br><b>root · UID 0</b></div><div class="boundary">→</div><div class="panel">HOST<br><b class="mapped">UID ?</b></div></div><div class="sub">same process, different host identity</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)}.mapping{flex:1;justify-content:center}.mapping .panel{width:39%;text-align:center}.mapping b{display:block;color:var(--accent);margin-top:9px}.boundary{height:65%;border-left:3px dashed var(--accent-3);display:grid;place-items:center;padding:0 10px;font-size:clamp(22px,5vmin,38px)}.stage[data-phase="1"] .boundary{border-color:var(--accent);color:var(--accent)}.stage[data-phase="2"] .mapped{font-size:0}.stage[data-phase="2"] .mapped:after{content:'UID 100000';font-size:clamp(12px,2.5vmin,16px)}.stage[data-phase="2"] .mapping .panel:last-child{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 15%,var(--surface))}

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()})