Integration test

<div class="stage"><div class="title">INTEGRATION TEST</div><div class="canvas"><div class="nodes"><div class="box" id="a">REQUEST</div><div class="wire"><i id="pulse"></i></div><div class="box" id="b">API</div><div class="wire"><i></i></div><div class="box" id="c">STORE</div></div><div class="receipt" id="receipt">201 · saved value read back</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(12px,4vmin,30px)}.nodes{display:flex;align-items:center;width:100%;max-width:650px}.nodes .box{flex:1}.wire{position:relative;flex:.35;height:2px;background:var(--line)}.wire i{position:absolute;left:0;top:-4px;width:9px;height:9px;border-radius:50%;background:var(--accent);animation:travel 2.4s infinite}.wire:nth-of-type(4) i{animation-delay:.6s}@keyframes travel{0%{left:0;opacity:0}20%{opacity:1}75%{left:100%;opacity:1}100%{left:100%;opacity:0}}.nodes .box{animation:glow 2.4s infinite}.nodes #b{animation-delay:.6s}.nodes #c{animation-delay:1.2s}@keyframes glow{0%,70%{border-color:var(--line)}20%,45%{border-color:var(--accent);color:var(--accent)}}.receipt{color:var(--accent);text-align:center}