Merge queue

<div class="demo files"><div class="heading"><strong>MERGE QUEUE</strong><span class="live">LIVE</span></div><div class="scene"><div class="diagram queue">
      <div class="queue-base"><span class="box cue " data-cue="0">main · M</span><span class="arrow" aria-hidden="true">→</span><span class="box cue " data-cue="1">PR A</span><span class="arrow" aria-hidden="true">→</span><span class="box cue " data-cue="3">PR B</span></div>
      <div class="queue-checks"><span class="box cue " data-cue="2">CI · M+A</span><span class="arrow" aria-hidden="true">→</span><span class="box cue " data-cue="3">CI · M+A+B</span></div></div></div><div class="caption" id="caption"></div><div class="ticks"><i></i><i></i><i></i><i></i></div></div>

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.stack{flex-direction:column;align-items:flex-start;gap:2px}.stack .layer{height:22px;min-height:0;justify-content:flex-start;padding-left:9px}.stack .layer:nth-child(1){width:70%}.stack .layer:nth-child(2){width:76%;margin-left:8%}.stack .layer:nth-child(3){width:76%;margin-left:16%}.stack .layer:nth-child(4){width:76%;margin-left:24%}.stack-note{position:absolute;opacity:0}
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.pickaxe{display:grid;grid-template-columns:1.2fr 1fr;grid-template-rows:1fr 23px;gap:4px}.pickaxe-code,.pickaxe-log{display:flex;flex-direction:column;gap:3px;min-width:0;height:100%;padding:4px;border:1px solid var(--line);border-radius:7px;background:var(--bg)}.pickaxe-code code{font:500 12px/1.2 ui-monospace,monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pickaxe-code code:first-of-type{color:var(--accent)}.pickaxe-log .box{flex:1;min-height:0}.pickaxe-match{border-style:dashed}.pickaxe-filter{grid-column:1/3;text-align:center;color:var(--accent);padding:2px}
.hashes{flex-direction:row;flex-wrap:wrap;align-content:center}.hash-lane{display:flex;flex-direction:column;justify-content:center;gap:5px;width:37%;min-width:0;height:62%;padding:4px;border:1px solid var(--line);border-radius:7px;background:var(--bg);text-align:center}.hash-lane .box{font:500 12px/1.2 ui-monospace,monospace;min-height:32px}.hash-bridge{width:22%;text-align:center;border-bottom:2px dashed var(--accent);color:var(--muted);font-size:12px}.hash-note{width:100%;text-align:center;color:var(--muted)}
.cleanup-row b{width:53px;flex:none}.cleanup-row>span:not(.box){flex:1;min-width:0;text-align:center;color:var(--muted)}.cleanup-row .box{width:36%;height:100%;min-height:0}.cleanup-preview{width:100%;text-align:center;color:var(--accent);min-height:18px}
.reset-grid{display:flex;flex-direction:column;gap:2px}.reset-head,.reset-row{width:100%;display:grid;grid-template-columns:48px repeat(3,1fr);gap:3px;text-align:center}.reset-head b{width:auto}.reset-row{flex:1;align-items:center;border:1px solid var(--line);border-radius:5px;background:var(--bg)}.reset-row strong{font-weight:600}.reset-row .changed{color:var(--accent)}.reset-row.active{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,var(--surface))}
.stash-shelf{position:relative;gap:5px}.stash-zone{flex:1;align-self:flex-start;min-width:0;height:calc(100% - 23px);display:flex;flex-direction:column;align-items:stretch;justify-content:center;gap:4px;padding:4px;border:1px solid var(--line);border-radius:7px;background:var(--bg);text-align:center}.stash-zone .box{flex:1;min-height:0}.stash-zone .box:not(.active){opacity:.7}.stash-transfer{flex:none;width:48px;text-align:center;color:var(--accent)}.stash-floor{position:absolute;bottom:0;width:100%;text-align:center;color:var(--muted);font-size:12px}
.tracking{flex-direction:column;gap:3px}.tracking-lane{display:flex;align-items:center;gap:4px;width:100%;flex:1;min-height:0}.tracking-lane b{width:52px;flex:none}.tracking-lane .box{width:17%;height:100%;min-height:0}.tracking-lane>span:last-child:not(.box){margin-left:auto;color:var(--muted)}.tracking-note{width:100%;text-align:center;color:var(--accent);min-height:16px}
.bisect-timeline{flex-direction:column;gap:3px}.bisect-ends,.bisect-window{display:flex;justify-content:space-between;width:100%;color:var(--muted)}.bisect-commits{display:flex;align-items:center;justify-content:space-between;gap:2px;width:100%;flex:1}.bisect-commits .box{flex:0 0 clamp(27px,8vmin,43px);min-width:0;min-height:clamp(27px,8vmin,43px);border-radius:50%}.bisect-window{justify-content:center;gap:5px}.bisect-window span{border:1px solid var(--line);border-radius:5px;padding:2px 4px;font-size:12px}.bisect-window span.active{color:var(--accent);border-color:var(--accent)}
@media(max-width:350px){.demo{padding:8px}.diagram{font-size:12px}.folder{gap:2px}.folder small{display:none}.arrow{font-size:15px}.graph-row b{width:38px}.diff-card{padding:3px 5px}}

const moments=[{"focus":0,"label":"Main starts at M"},{"focus":1,"label":"PR A joins the queue"},{"focus":2,"label":"Check the combined state M+A"},{"focus":3,"label":"B checks against the updated base"}];let n=0;const cues=[...document.querySelectorAll('[data-cue]')],ticks=[...document.querySelectorAll('.ticks i')],caption=document.getElementById('caption'),dynamic=document.querySelector('.dynamic');function show(){const m=moments[n];cues.forEach(el=>el.classList.toggle('active',el.dataset.cue.split(',').includes(String(m.focus))));if(dynamic&&m.cells)dynamic.textContent=m.cells[m.cells.length-1];ticks.forEach((el,i)=>el.classList.toggle('active',i===n));caption.textContent=m.label;n=(n+1)%moments.length}show();let timer=setInterval(show,1050);document.querySelector('.demo').addEventListener('pointerdown',()=>{clearInterval(timer);show()})