@font-face{font-family:Departure Mono;src:url(/fonts/DepartureMono-Regular.woff2)format("woff2"),url(/fonts/DepartureMono-Regular.woff)format("woff");font-weight:400;font-style:normal;font-display:swap}:root{--paper:#f4f1e9;--paper-bright:#fbf9f4;--ink:#14161a;--ink-soft:#4a4e57;--blue:#1f3fd0;--blue-deep:#142a8c;--blue-wash:#1f3fd012;--blue-line:#1f3fd03d;--rule:#14161a29;--red:#c0341c;--mono:"Departure Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;--serif:"Newsreader", "Iowan Old Style", Georgia, serif;--gutter:clamp(1.25rem, 4vw, 4rem);--measure:36rem}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{background-color:var(--paper);background-image:linear-gradient(var(--blue-line) 1px, transparent 1px), linear-gradient(90deg, var(--blue-line) 1px, transparent 1px);color:var(--ink);font-family:var(--serif);font-optical-sizing:auto;background-position:-1px -1px;background-size:44px 44px;margin:0;font-size:1.0625rem;line-height:1.62}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(120% 80% at 50% 0,#0000 40%,#f4f1e9bf 100%);position:fixed;inset:0}::selection{background:var(--blue);color:var(--paper-bright)}a{color:var(--blue);text-underline-offset:3px;text-decoration-thickness:1px}a:hover{color:var(--blue-deep)}.sheet{z-index:1;max-width:88rem;padding:0 var(--gutter);background:linear-gradient(var(--paper-bright), var(--paper-bright)) padding-box;border-left:1px solid var(--rule);border-right:1px solid var(--rule);margin:0 auto;position:relative}.band{padding:clamp(2.25rem,4vw,3.75rem) 0}.prose{max-width:var(--measure);text-align:justify;-webkit-hyphens:auto;hyphens:auto}.prose p{margin:0 0 1.1em}.prose p:last-child{margin-bottom:0}.lede{font-size:1.25rem;line-height:1.5}.code{font-family:var(--mono);letter-spacing:.03em;color:var(--blue);font-size:.85em}.lede:first-letter{float:left;color:var(--blue);padding:.06em .09em 0 0;font-size:3.4em;line-height:.78}.mono{font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;font-size:11px;line-height:1.45}.tag{font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--blue);font-size:11px}.rule-label{align-items:center;gap:.85rem;margin-bottom:2rem;display:flex}.rule-label:after{content:"";background:var(--rule);flex:1;height:1px}.masthead{padding-top:clamp(2.5rem,6vw,5rem)}.masthead__top{border-bottom:2px solid var(--ink);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:1rem 2rem;padding-bottom:1.25rem;display:flex}.masthead__title{font-family:var(--mono);letter-spacing:-.02em;text-transform:uppercase;color:var(--ink);margin:1.75rem 0 0;font-size:clamp(2.75rem,11.5vw,8.25rem);line-height:.86}.masthead__sub{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:1.5rem;margin-top:1.1rem;display:flex}.masthead__standfirst{max-width:42rem;margin:0;font-size:1.15rem;line-height:1.45}.masthead__meta{text-align:right;grid-template-columns:auto auto;gap:.25rem 1.1rem;display:grid}.masthead__meta dt{color:var(--ink-soft)}.masthead__meta dd{color:var(--blue);margin:0}.linkrow{flex-wrap:wrap;gap:0 1.5rem;margin-top:1.75rem;display:flex}.linkrow a{border-bottom:1px solid var(--blue-line);padding-bottom:2px;text-decoration:none}.linkrow a:hover{border-bottom-color:var(--blue)}.figure{text-align:left;-webkit-hyphens:none;hyphens:none;grid-template-columns:1.75rem 1fr;gap:0 .85rem;margin:2.75rem 0 0;display:grid}.figure__spine{writing-mode:vertical-rl;font-family:var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--blue);border-right:1px solid var(--blue-line);text-align:end;white-space:nowrap;padding:.35rem .35rem .35rem 0;font-size:11px;overflow:hidden;transform:rotate(180deg)}.figure__frame{border:1px solid var(--blue-line);background:var(--paper-bright);padding:clamp(.9rem,2.2vw,1.5rem)}.figure__caption{font-family:var(--mono);letter-spacing:.04em;color:var(--ink-soft);grid-column:2;gap:.65rem;margin-top:.7rem;font-size:11px;line-height:1.5;display:flex}.figure__caption b{color:var(--blue);white-space:nowrap;text-transform:uppercase;font-weight:400}.controls{border-bottom:1px dashed var(--blue-line);flex-wrap:wrap;align-items:center;gap:.75rem 1.5rem;margin-bottom:1rem;padding-bottom:1rem;display:flex}.btn{font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--blue);border:1px solid var(--blue-line);cursor:pointer;background:0 0;padding:6px 11px;font-size:11px}.btn:hover{background:var(--blue-wash);border-color:var(--blue)}.btn[aria-pressed=true]{background:var(--blue);border-color:var(--blue);color:var(--paper-bright)}.slider{flex:15rem;align-items:center;gap:.65rem;display:flex}.slider input[type=range]{min-width:7rem;accent-color:var(--blue);flex:1;height:2px}.readout{font-family:var(--mono);letter-spacing:.06em;color:var(--blue);min-width:3.5em;font-size:11px}.stats{background:var(--blue-line);border:1px solid var(--blue-line);grid-template-columns:repeat(4,1fr);gap:1px;margin-top:1rem;display:grid}.stat{background:var(--paper-bright);padding:.6rem .7rem}.stat dt{font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft);font-size:11px}.stat dd{font-family:var(--mono);color:var(--blue);font-variant-numeric:tabular-nums;margin:.25rem 0 0;font-size:22px;line-height:1}.stat dd.is-bad{color:var(--red)}.spec-block{margin-top:2.75rem}.specdl{margin:0}.specdl__row{border-bottom:1px solid var(--rule);padding:.6rem 0}.specdl__row:last-child{border-bottom:none}.specdl dt{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);font-size:10px}.specdl dd{font-family:var(--mono);letter-spacing:.02em;color:var(--ink);margin:.3rem 0 0;font-size:11.5px;line-height:1.55}.specdl dd b{color:var(--blue);font-weight:400}table.spec{border-collapse:collapse;width:100%;font-family:var(--mono);letter-spacing:.04em;margin-top:0;font-size:11px}table.spec th,table.spec td{text-align:left;border-bottom:1px solid var(--rule);vertical-align:top;padding:.5rem .75rem .5rem 0}table.spec th{text-transform:uppercase;width:18rem;color:var(--ink-soft);font-weight:400}table.spec td{color:var(--ink)}table.spec td b{color:var(--blue);font-weight:400}.toc{margin:0;padding:0;list-style:none}.toc li{border-bottom:1px solid var(--rule)}.toc li:last-child{border-bottom:none}.toc a{color:var(--ink);grid-template-columns:3rem 1fr auto;align-items:baseline;gap:1rem;padding:.85rem 0;text-decoration:none;display:grid}.toc a:hover{background:var(--blue-wash)}.toc__num,.toc__meta{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--blue);font-size:11px}.toc__title{font-size:1.35rem;line-height:1.25;position:relative}.projects__note{color:var(--ink-soft);margin:-.75rem 0 2rem}.toc__project{letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:.2rem;font-size:11px;font-weight:400;display:block}.toc a:hover .toc__title{color:var(--blue)}.chapter__head{border-top:1px solid var(--rule);flex-wrap:wrap;align-items:baseline;gap:.75rem 1.5rem;margin-bottom:1.5rem;padding-top:1.4rem;display:flex}.chapter__num{font-family:var(--mono);color:var(--blue);font-size:44px;line-height:1}.chapter__headtext{flex:22rem}.chapter__kicker{letter-spacing:.13em;text-transform:uppercase;flex-wrap:wrap;align-items:baseline;gap:.35rem 1.4rem;margin-bottom:.5rem;font-size:12px;display:flex}.chapter__project{color:var(--blue)}.chapter__kicker a{color:var(--ink-soft);border-bottom:1px solid var(--rule);padding-bottom:2px;text-decoration:none}.chapter__kicker a:after{content:" ↗"}.chapter__kicker a:hover{color:var(--blue);border-bottom-color:var(--blue)}.chapter__title{max-width:46ch;margin:0;font-size:clamp(1.75rem,4vw,2.75rem);font-weight:400;line-height:1.1}.chapter__body{grid-template-columns:minmax(0, var(--measure)) minmax(0, 1fr);align-items:start;gap:clamp(2rem,4vw,4rem);display:grid}.chapter__aside .spec-block{margin-top:0}.chapter__aside .rule-label{margin-bottom:.6rem}.chapter__stack{color:var(--ink-soft);margin-top:.9rem}.track{margin-bottom:1.25rem}.track:last-child{margin-bottom:0}.track__label{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:.5rem;font-size:11px;display:flex}.track__verdict{color:var(--red)}.track__verdict.is-good{color:var(--blue)}.grid{grid-template-columns:repeat(64,1fr);gap:1px;display:grid}.cell{aspect-ratio:1;background:#14161a12;transition:background-color 90ms linear}.cell.is-inflight{background:#1f3fd04d}.cell.is-arrived{background:#1f3fd08c}.cell.is-delivered,.cell.is-written{background:var(--blue)}.cell.is-missing{background:var(--red)}.cell.is-resending{background:#c0341c66}.cell.is-window{outline:1px solid var(--blue-line);outline-offset:-1px}.legend{border-top:1px dashed var(--blue-line);font-family:var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--ink-soft);flex-wrap:wrap;gap:.4rem 1.25rem;margin:.9rem 0 0;padding:.7rem 0 0;font-size:11px;list-style:none;display:flex}.legend li{align-items:center;gap:.45rem;display:flex}.legend .cell{aspect-ratio:auto;flex:none;width:11px;height:11px}.legend--map svg{flex:none}.band__swatch{background:var(--blue);flex:none;width:11px;height:11px}.dim{color:var(--ink-soft)}.probe__result{color:var(--blue);margin:.9rem 0 0}.submeasure{border-top:1px solid var(--rule);margin-top:1.75rem;padding-top:.25rem}table.spec--tight th{width:12rem}table.spec--tight td,table.spec--tight th{padding-top:.35rem;padding-bottom:.35rem}.seg{align-items:center;gap:.5rem;display:flex}.stat dd.stat--text{color:var(--ink);font-size:13px;line-height:1.3}.merge{background:var(--blue-line);border:1px solid var(--blue-line);grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:1px;display:grid}.merge__lane{background:var(--paper-bright);padding:.8rem .9rem 1rem}.merge__lane.is-authoritative{background:var(--blue-wash)}.merge__lane.is-down{background:repeating-linear-gradient(-45deg, var(--paper-bright), var(--paper-bright) 6px, #c0341c0f 6px, #c0341c0f 12px)}.merge__lane h4{font-family:var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--blue);border-bottom:1px solid var(--rule);margin:0 0 .6rem;padding-bottom:.4rem;font-size:11px}.merge__lane dl{font-family:var(--mono);letter-spacing:.04em;grid-template-columns:8rem 1fr;gap:.3rem .75rem;margin:0;font-size:11px;display:grid}.merge__lane dt{color:var(--ink-soft);text-transform:uppercase}.merge__lane dd{color:var(--ink);margin:0}.merge__down{font-family:var(--mono);letter-spacing:.04em;color:var(--red);margin:0;font-size:11px}.merge__gate,.merge__out{border:1px solid var(--blue-line);border-top:none;padding:.75rem .9rem .9rem}.merge__gate p{max-width:46rem;margin:.4rem 0 0}.merge__out{background:var(--blue);border-color:var(--blue)}.merge__out .tag{color:#fbf9f4b3}.merge__out p{color:var(--paper-bright);margin:.35rem 0 0;font-size:1.5rem;line-height:1.25}.verdict{border:1px solid var(--blue-line);font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--blue);margin:1rem 0 0;padding:.6rem .75rem;font-size:11px}.verdict.is-neither{color:var(--red);border-color:#c0341c4d}.verdict.is-walkable{background:var(--blue-wash)}.pipe{background:var(--blue-line);border:1px solid var(--blue-line);grid-template-columns:repeat(auto-fit,minmax(9rem,1fr));gap:1px;display:grid}.pipe__stage{background:var(--paper-bright);padding:.7rem .8rem .85rem;transition:background-color .12s linear;position:relative}.pipe__stage.is-active{background:var(--blue-wash)}.pipe__stage h4{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin:0 0 .35rem;font-size:11px}.pipe__stage p{color:var(--ink-soft);margin:0;font-size:.9rem;line-height:1.35}.pipe__count{font-family:var(--mono);color:var(--ink);font-variant-numeric:tabular-nums;margin-top:.6rem;font-size:22px;line-height:1;display:block}.pipe__stage.is-api .pipe__count{color:var(--red)}.feed{border:1px solid var(--blue-line);height:9.7rem;font-family:var(--mono);letter-spacing:.03em;margin-top:1rem;padding:.6rem .75rem;font-size:11px;line-height:1.75;overflow:hidden}.feed__row{color:var(--ink-soft);white-space:nowrap;grid-template-columns:5.5rem 1fr;gap:.75rem;display:grid;overflow:hidden}.feed__verdict{color:var(--blue)}.feed__verdict.is-api{color:var(--red)}.feed__text{text-overflow:ellipsis;overflow:hidden}.probe{gap:.5rem;margin-top:1rem;display:flex}.probe input{font-family:var(--mono);letter-spacing:.04em;border:1px solid var(--blue-line);background:var(--paper);color:var(--ink);flex:1;padding:8px 10px;font-size:11px}.probe input:focus{outline:1px solid var(--blue);outline-offset:-1px}.map{cursor:crosshair;touch-action:none;width:100%;height:auto;display:block}.map__stop{fill:#14161a52}.map__hub{fill:var(--blue)}.map__grocery{fill:none;stroke:var(--blue);stroke-width:1.5px}.map__zone{fill:var(--blue);fill-opacity:.05;stroke:var(--blue);stroke-opacity:.5;stroke-width:1px}.map__zone.is-transit{stroke-dasharray:4 3;fill-opacity:.035}.map__limit{fill:none;stroke:var(--blue);stroke-opacity:.5;stroke-dasharray:2 2}.map__pin{fill:var(--red)}.map__pin.is-walkable{fill:var(--blue)}.log{grid-template-columns:repeat(auto-fit,minmax(23rem,1fr));gap:2rem 4rem;display:grid}.log__when{font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--blue);margin-bottom:.9rem;font-size:11px;display:block}.log__org{letter-spacing:.13em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 .15rem;font-size:12px}.log__what h3{margin:0 0 .35rem;font-size:1.35rem;font-weight:400}.log__what p{color:var(--ink-soft);margin:0}.colophon{grid-template-columns:repeat(auto-fit,minmax(13rem,1fr));gap:2rem;display:grid}.colophon h3{font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--blue);border-bottom:1px solid var(--rule);margin:0 0 .6rem;padding-bottom:.4rem;font-size:11px}.colophon p,.colophon li{color:var(--ink-soft);margin:0 0 .4rem;font-size:.95rem}.colophon ul{margin:0;padding:0;list-style:none}@media (width<=64rem){.chapter__body{grid-template-columns:minmax(0,1fr)}.chapter__aside .spec-block{margin-top:1rem}}@media (width<=44rem){.figure{grid-template-columns:1fr}.figure__spine{writing-mode:horizontal-tb;border-right:none;border-bottom:1px solid var(--blue-line);text-align:start;margin-bottom:.6rem;padding:0 0 .35rem;transform:none}.figure__caption{flex-direction:column;grid-column:1;gap:.25rem}.masthead__meta{text-align:left}.grid{grid-template-columns:repeat(32,1fr)}.merge__lane dl{grid-template-columns:7rem 1fr}.stats{grid-template-columns:repeat(2,1fr)}table.spec th{width:9rem}.log__row{grid-template-columns:1fr;gap:.5rem}.toc a{grid-template-columns:2.5rem 1fr}.toc__meta{grid-column:2}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.cell,.pipe__stage{transition:none}}