:root{--ground:#FAFBFA;--surface:#F1F4F3;--card:#FFFFFF;--line:#D2DBD9;--line-soft:#E3E9E7;--ink:#101A18;--ink-2:#3C4A47;--ink-3:#5A6864;--accent:#0E6B65;--accent-deep:#0A4F4A;--accent-soft:#DDEEEC;--accent-line:#8FC2BD;--chip-teal:#CBE7E3;--chip-bg:#EDF3F2;--chip-line:#CBD9D6;--band:#C9DEDB;--red:#8A3A3A;--red-soft:#C98A8A;--red-mid:#A85C5C;--green:#2F6B4A;--green-soft:#8FBFA3;--amber:#7A5C2E;--series3:#3C6E8F;--series4:#8A5A6B;--series5:#5B7A3C;--header-bg:rgba(250,251,250,0.93)}
:root{color-scheme:light}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:4.5rem}
body{margin:0;background:var(--ground);color:var(--ink);
  font:400 1rem/1.6 'Public Sans',system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-deep);text-decoration:underline}
::selection{background:var(--accent-soft)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
code,pre{font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.875em}
p code,li code{background:var(--chip-bg);border:1px solid var(--chip-line);border-radius:4px;
  padding:0 0.25rem;font-size:0.8125rem;overflow-wrap:anywhere}
h1,h2,h3{font-family:'Source Serif 4',ui-serif,Georgia,serif;font-weight:600;color:var(--ink);margin:0;letter-spacing:-0.015em}
h1{font-size:clamp(2rem,1.3rem + 2.4vw,2.75rem);line-height:1.1;max-width:30ch;text-wrap:balance}
h2{font-size:1.75rem;line-height:1.15;margin:0 0 1rem;text-wrap:balance}
h3{font-size:1.0625rem;line-height:1.3;margin:0 0 0.35rem}
p{margin:0 0 0.85rem;text-wrap:pretty}
.wrap{max-width:1040px;margin:0 auto;padding:0 1.5rem}
.prose{max-width:42rem}
.prose-wide{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 1.6rem;margin-bottom:1rem}
.prose h3{margin-top:1.6rem}
.nw{white-space:nowrap}

.site-head{position:sticky;top:0;z-index:10;background:var(--header-bg);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.head-row{display:flex;align-items:center;gap:1.5rem;padding-top:0.7rem;padding-bottom:0.7rem}
.brand{display:flex;align-items:center;gap:0.5rem;color:var(--ink)}
.brand:hover{text-decoration:none;color:var(--ink)}
.wordmark{font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:1.0625rem;font-weight:500;letter-spacing:-0.01em}
.site-nav{display:flex;gap:1.3rem;flex-wrap:wrap}
.site-nav a{font-size:0.875rem;color:var(--ink-2)}
.site-nav a[aria-current]{color:var(--ink);font-weight:500}
.site-nav{align-items:center}
.nav-menu{position:relative}
.nav-trigger{display:inline-flex;align-items:center;gap:0.3rem;font:inherit;font-size:0.875rem;
  color:var(--ink-2);background:none;border:0;padding:0;cursor:pointer}
.nav-trigger:hover,.nav-trigger[aria-expanded="true"],.nav-menu.is-current .nav-trigger{color:var(--ink)}
.nav-menu.is-current .nav-trigger{font-weight:500}
.chev{width:0.75rem;height:0.75rem;fill:none;stroke:currentColor;stroke-width:1.5;
  stroke-linecap:round;stroke-linejoin:round;transition:transform 0.18s ease}
.nav-trigger[aria-expanded="true"] .chev{transform:rotate(180deg)}
.menu-panel{position:absolute;top:calc(100% + 0.9rem);left:-1.1rem;z-index:20;
  display:grid;grid-template-columns:21.5rem 17.5rem;gap:0.5rem;padding:0.5rem;background:var(--card);border:1px solid var(--line);
  border-radius:12px;box-shadow:0 1px 2px rgba(16,26,24,0.06),0 18px 44px rgba(16,26,24,0.14);
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity 0.16s ease,transform 0.16s ease,visibility 0s linear 0.16s}
.menu-panel::before{content:"";position:absolute;left:0;right:0;top:-0.9rem;height:0.9rem}
.nav-trigger[aria-expanded="true"] + .menu-panel,html:not(.js) .nav-menu:focus-within .menu-panel{
  opacity:1;visibility:visible;transform:none;transition:opacity 0.16s ease,transform 0.16s ease}
@media (hover: hover){html:not(.js) .nav-menu:hover .menu-panel{opacity:1;visibility:visible;transform:none;
  transition:opacity 0.16s ease,transform 0.16s ease}
  html:not(.js) .nav-menu:hover .chev{transform:rotate(180deg)}}
html:not(.js) .menu-panel{grid-template-columns:21.5rem}
html:not(.js) .menu-preview{display:none}
.menu-list{position:relative;display:grid;gap:0.15rem;align-content:start}
.menu-glide{position:absolute;left:0;right:0;top:0;height:0;border-radius:8px;background:var(--surface);
  opacity:0;pointer-events:none;transition:transform 0.26s cubic-bezier(0.2,0.8,0.2,1),
  height 0.26s cubic-bezier(0.2,0.8,0.2,1),opacity 0.15s ease}
.menu-glide.on{opacity:1}
.menu-glide.jump{transition:none}
.site-nav .menu-item{position:relative;display:grid;grid-template-columns:2.25rem minmax(0,1fr);gap:0.8rem;align-items:center;
  padding:0.6rem 0.7rem;border-radius:8px;color:var(--ink)}
.site-nav .menu-item:hover,.site-nav .menu-item:focus-visible{background:var(--surface);text-decoration:none;color:var(--ink)}
.site-nav .menu-item[aria-current]{background:var(--accent-soft);font-weight:400}
.menu-icon{width:2.25rem;height:2.25rem;padding:0.4rem;fill:none;stroke:var(--ink);stroke-width:1.4;
  stroke-linecap:round;stroke-linejoin:round;border:1px solid var(--line);border-radius:8px;
  background:var(--ground);transition:stroke 0.15s ease,border-color 0.15s ease}
.menu-item:hover .menu-icon,.menu-item[aria-current] .menu-icon{stroke:var(--accent);border-color:var(--accent-line)}
html.js .site-nav .menu-item:not([aria-current]):hover,html.js .site-nav .menu-item:not([aria-current]):focus-visible{background:transparent}
html.js .menu-item:hover .menu-icon{stroke:var(--ink);border-color:var(--line)}
.menu-item.is-active .menu-icon,html.js .menu-item.is-active:hover .menu-icon{stroke:var(--accent);border-color:var(--accent-line);background:var(--card)}
.menu-item.is-active .menu-icon > *{animation:icon-draw 0.6s cubic-bezier(0.3,0.7,0.2,1) both}
@keyframes icon-draw{from{stroke-dasharray:1;stroke-dashoffset:1}to{stroke-dasharray:1;stroke-dashoffset:0}}
.menu-preview{position:relative;display:block;min-height:16rem;overflow:hidden;border-radius:9px;
  background:var(--surface);border:1px solid var(--line-soft);color:var(--ink)}
.menu-preview:hover{text-decoration:none;color:var(--ink)}
.pv{position:absolute;inset:0;display:flex;flex-direction:column;gap:0.7rem;padding:1rem 1.05rem;
  opacity:0;transform:translateY(6px);pointer-events:none;
  transition:opacity 0.22s ease,transform 0.3s cubic-bezier(0.2,0.8,0.2,1)}
.pv.is-on{opacity:1;transform:none}
.pv-head{margin:0;font:600 1rem/1.3 'Source Serif 4',ui-serif,Georgia,serif;letter-spacing:-0.01em;color:var(--ink)}
.pv-text{margin:0;font-size:0.8125rem;line-height:1.5;color:var(--ink-2)}
.pv-more{margin-top:auto;font-size:0.8125rem;font-weight:500;color:var(--accent)}
.menu-preview:hover .pv-more{color:var(--accent-deep)}
.pv-install{display:block;padding:0.5rem 0.7rem;border:1px solid var(--accent-line);border-radius:6px;
  background:var(--accent-soft);color:var(--accent-deep);font-size:0.8125rem}
.pv-ticks{list-style:none;margin:0;padding:0;display:grid;gap:0.5rem;font-size:0.8125rem;line-height:1.4;color:var(--ink-2)}
.pv-ticks li{position:relative;padding-left:1.35rem}
.pv-ticks li::before{content:"";position:absolute;left:0.1rem;top:0.28em;width:0.7rem;height:0.38rem;
  border-left:1.6px solid var(--accent);border-bottom:1.6px solid var(--accent);transform:rotate(-45deg)}
.mini-wrap{position:relative;flex:1;min-height:9rem}
.tree-wrap{position:relative;flex:1;min-height:11rem;margin:-0.2rem -0.3rem 0}
.mini-tree{position:absolute;inset:0;display:block;width:100%;height:100%}
.mini-sphere{position:absolute;inset:0;display:block;width:100%;height:100%}
.pv-faq{list-style:none;margin:0;padding:0;display:grid;gap:0.15rem;font-size:0.8125rem;line-height:1.45}
.pv-faq li{position:relative;padding:0.4rem 0.55rem 0.4rem 0.75rem;border-radius:6px;transition:background-color 0.25s ease}
.pv-faq li::before{content:"";position:absolute;left:0;top:0.45rem;bottom:0.45rem;width:2px;border-radius:2px;background:var(--line-soft)}
.pv-faq li::after{content:"";position:absolute;left:0;top:0.45rem;bottom:0.45rem;width:2px;border-radius:2px;
  background:var(--accent);transform:scaleY(0);transform-origin:top}
.pv-faq li.is-open{background:var(--card)}
.pv-faq li.is-open::after{transform:scaleY(1)}
.pv-faq li.is-timed::after{animation:pv-turn var(--turn,4s) linear both}
.pv.is-on .pv-faq{pointer-events:auto}
.pv-faq.is-held li.is-timed::after{animation-play-state:paused}
@keyframes pv-turn{from{transform:scaleY(0)}to{transform:scaleY(1)}}
.pv-q{display:block;font-weight:500;color:var(--ink-2);transition:color 0.2s ease,margin 0.35s ease}
.pv-faq li.is-open .pv-q{color:var(--ink);margin-bottom:0.2rem}
.pv-fold{display:grid;grid-template-rows:0fr;transition:grid-template-rows 0.35s cubic-bezier(0.2,0.8,0.2,1)}
.pv-faq li.is-open .pv-fold{grid-template-rows:1fr}
.pv-a{margin:0;min-height:0;overflow:hidden;color:var(--ink-2);opacity:0;transition:opacity 0.3s ease 0.08s}
.pv-faq li.is-open .pv-a{opacity:1}
.pv-table{width:100%;border-collapse:collapse;font-size:0.75rem;line-height:1.35}
.pv-table th{padding:0 0.35rem 0.4rem;text-align:left;vertical-align:bottom;font-weight:600;color:var(--ink);
  border-bottom:1px solid var(--line)}
.pv-table td{padding:0.45rem 0.35rem;color:var(--ink-2);border-bottom:1px solid var(--line-soft)}
.pv-table tbody tr:first-child td{background:var(--accent-soft);color:var(--ink);font-weight:600}
.pv-table tr:last-child td{border-bottom:0}
@media (max-width: 860px){.menu-preview{display:none}.menu-panel{grid-template-columns:21.5rem}}
.menu-text{display:grid;gap:0.1rem}
.menu-name{font-weight:600;font-size:0.9375rem;color:var(--ink)}
.menu-said{font-size:0.8125rem;line-height:1.35;color:var(--ink-3)}
@media (prefers-reduced-motion: reduce){.menu-panel,.chev,.menu-glide,.pv{transition:none}
  .menu-item.is-active .menu-icon > *{animation:none}
  .pv-faq li,.pv-q,.pv-fold,.pv-a{transition:none}}
.head-end{margin-left:auto;display:flex;align-items:center;gap:0.75rem}

.btn{display:inline-flex;align-items:center;font:500 0.9375rem/1.2 'Public Sans',system-ui,-apple-system,sans-serif;padding:0.6rem 1rem;
  border-radius:6px;border:1px solid var(--line);color:var(--ink);background:var(--card)}
.btn:hover{text-decoration:none;color:var(--ink);border-color:var(--accent-line)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--ground)}
.btn-primary:hover{background:var(--accent-deep);border-color:var(--accent-deep);color:var(--ground)}
.btn-small{font-size:0.85rem;padding:0.35rem 0.8rem;background:var(--accent);
  border-color:var(--accent);color:var(--ground)}
.btn-soon,.btn-soon:hover{background:var(--surface);border:1px dashed var(--accent-line);
  color:var(--ink-2);cursor:default}

.hero{padding-top:3.5rem;padding-bottom:1rem}
.hero h1{max-width:none;font-size:clamp(1.75rem,1rem + 1.4vw,1.85rem);text-wrap:balance}
.lede{font-size:1.1875rem;line-height:1.6;color:var(--ink-2);margin:1.1rem 0 0.8rem}
.lede + .lede{margin-top:0}
.lede b{font-weight:600;color:var(--ink)}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:0.7rem;margin-top:1.4rem}
.install{display:inline-flex;align-items:center;gap:0.6rem;border:1px solid var(--accent-line);
  border-radius:6px;background:var(--accent-soft);padding:0.42rem 0.5rem 0.42rem 0.9rem}
.install code{color:var(--accent-deep);font-size:0.875rem;background:none;border:0;padding:0}
.actions .install{align-self:stretch;padding-top:0;padding-bottom:0;min-height:2.45rem}
.copy{font:500 0.75rem/1 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-2);background:var(--card);
  border:1px solid var(--line);border-radius:5px;padding:0.35rem 0.55rem;cursor:pointer}
.note{font-size:0.875rem;color:var(--ink-3);margin-top:1rem}
.eyebrow{font-size:1.0625rem;font-weight:500;color:var(--accent);margin:0 0 0.6rem}
.intro{color:var(--ink-2);font-size:1.0625rem}

.sim{margin:2rem 0 0}
.mv{border:1px solid var(--line);border-radius:8px;background:var(--surface);
  box-shadow:0 18px 50px rgba(16,26,24,0.10);padding:0.9rem 1.2rem 1.1rem}
.mv-head{display:flex;justify-content:space-between;gap:0.4rem 1rem;flex-wrap:wrap;margin:0 0 0.4rem;
  font:500 0.75rem/1.4 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-2)}
.mv-key{display:flex;flex-wrap:wrap;align-items:center;gap:0.3rem 0.9rem;font-family:'Public Sans',system-ui,-apple-system,sans-serif;font-size:0.75rem;color:var(--ink-2)}
.mv-key span{display:inline-flex;align-items:center;gap:0.4rem}
.mv-key i{display:inline-block;flex:none}
.mv-key .k-ahead,.mv-key .k-behind{width:22px;height:8px;border-radius:0 4px 4px 0;opacity:0.55}
.mv-key .k-ahead{background:var(--green)}
.mv-key .k-behind{background:var(--red)}
.mv-key .k-shock{width:8px;height:8px;background:var(--ink);transform:rotate(45deg)}
.mv-key .k-fork{width:9px;height:9px;border-radius:50%;border:2px solid var(--ink-2);background:var(--card)}
.mv-key .k-live{width:9px;height:9px;border-radius:50%;background:var(--ink-2);box-shadow:0 0 0 3px rgba(60,74,71,0.2)}
.bg{position:relative}
.bg-stage{position:absolute;inset:0}
.bg-still{display:block;width:100%;height:auto}
.bg-svg{position:absolute;left:0;top:0;display:block;overflow:visible}
.bg-ribbon{opacity:0.5}
.bg-ribbon.is-ahead{fill:var(--green)}
.bg-ribbon.is-behind{fill:var(--red)}
.bg-rail{fill:none;stroke-width:1.8;stroke-linecap:butt;opacity:0.85}
.bg-rail.is-root{stroke-width:3;opacity:1}
.bg-conn{fill:none;stroke-width:1.8;stroke-linecap:round;opacity:0.85}
.bg-fork{fill:var(--surface);stroke-width:2}
.bg-shock{fill:var(--ink);stroke:var(--surface);stroke-width:1.5}
.bg-halo{opacity:0.18}
.bg-vix{fill:var(--amber);opacity:0.18}
.bg-lanes,.bg-nums{position:absolute;inset:0;pointer-events:none}
.bg-lane{position:absolute;left:0;transform:translateY(-50%);display:flex;align-items:center;gap:0.35rem;
  max-width:196px;opacity:0;transition:opacity 0.3s ease}
.bg-lane.is-on{opacity:1}
.bg-fold{flex:none;width:12px;font-size:12px;line-height:1;color:var(--ink-3);text-align:center}
.bg-box{flex:none;width:16px;height:16px;border-radius:4px;border:2px solid;color:var(--card);font-size:10px;
  line-height:12px;text-align:center;font-weight:700}
.bg-name{min-width:0;padding:0.15rem 0.3rem;border-radius:6px;font:400 14px/1.5 'Public Sans',system-ui,-apple-system,sans-serif;color:var(--ink-2);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bg-lane.is-root .bg-name{font-weight:600;color:var(--ink);background:var(--accent-soft)}
.bg-num{position:absolute;transform:translate(-100%,-50%);font:400 13px/1 'Spline Sans Mono',ui-monospace,monospace;white-space:nowrap;color:var(--ink-2)}
.bg-num.is-gap{font-weight:500}
.bg-num.is-head{font-size:11px;color:var(--ink-3)}
.bg[data-compact] .bg-lane{transform:translateY(-135%);max-width:none}
.bg[data-compact] .bg-name{padding:0 0.25rem;border-radius:3px;font-size:10.5px;line-height:1.3;background:var(--surface)}
.bg[data-compact] .bg-lane.is-root .bg-name{background:transparent;padding-left:0}
.bg[data-compact] .bg-num{font-size:10.5px}
.bg[data-compact] .bg-num.is-head{font-size:9.5px}
@media (max-width:640px){
  .mv{padding:0.7rem 0.8rem 0.9rem}
  .mv-key{display:none}
  .bg-lane{max-width:92px;gap:0.25rem}
  .bg-fold{display:none}
  .bg-box{width:12px;height:12px;border-width:1.5px;font-size:8px;line-height:9px}
  .bg-name{font-size:12px;padding:0.1rem 0.15rem}
  .bg-num{font-size:12px}
}

.faq{margin:1rem 0 0;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:0.9rem 0}
.faq summary{cursor:pointer;font-weight:500;color:var(--ink);list-style-position:outside}
.faq details p{margin:0.6rem 0 0;color:var(--ink-2)}
.section{padding-top:1.75rem;padding-bottom:0;border-top:1px solid var(--line);margin-top:1.75rem}
/* The same space above a divider as below it: nothing the section ends on
   adds its own margin to the gap. */
.section > :last-child{margin-bottom:0}
.band{padding-top:1.75rem;margin-top:1.75rem;border-top:1px solid var(--line)}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:1.6rem;align-items:start;margin-top:1rem}
.split-code{grid-template-columns:minmax(0,31rem) minmax(0,1fr);align-items:start}
.code{margin:0;padding:1rem 1.1rem;background:var(--surface);border:1px solid var(--line);
  border-radius:6px;overflow-x:auto;color:var(--ink-2);font-size:0.8125rem;line-height:1.7}
.code b{color:var(--accent);font-weight:500}

.chart{margin:0;display:flex;flex-direction:column;gap:0.55rem;background:var(--surface);
  border:1px solid var(--line);border-radius:6px;padding:0.75rem 0.85rem 0.85rem}
.chart-box{flex:1;display:flex;flex-direction:column}
.chart-head{display:flex;justify-content:space-between;font:400 0.6875rem/1.3 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-3);padding:0 0.1rem 0.35rem}
.chart svg{display:block;width:100%;height:auto}
.chart .gridline{stroke:var(--ink);stroke-opacity:0.09}
.chart .baseline{stroke:var(--ink);stroke-opacity:0.22;stroke-dasharray:3 3}
.chart .cursor{stroke:var(--accent);stroke-opacity:0.35}
.chart text{font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:13px;fill:var(--ink-3)}
.legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(7rem,1fr));gap:0.35rem 0.75rem;margin-top:auto;
  padding:0.25rem 0.1rem 0.15rem;font:400 0.6875rem/1.4 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-2)}
.lg{display:flex;align-items:center;gap:0.3rem}
.lg i{width:8px;height:8px;border-radius:2px;flex:none}
.lg b{margin-left:auto;font-weight:400;font-variant-numeric:tabular-nums}
.chart-controls{display:flex;flex-wrap:wrap;gap:0.4rem 0.8rem;align-items:center;padding:0 0.2rem}
.chart-controls input{flex:1;min-width:8rem;accent-color:var(--accent)}
.play{width:30px;height:30px;flex:none;border:1px solid var(--accent-line);border-radius:6px;
  background:var(--accent-soft);color:var(--accent-deep);cursor:pointer;font:500 0.8125rem/1 'Spline Sans Mono',ui-monospace,monospace}
.readout{font:400 0.75rem/1.3 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-3)}
.chart figcaption{font-size:0.8125rem;color:var(--ink-3);margin:0}

.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:6px;background:var(--card)}
table.accuracy{border-collapse:collapse;width:100%;font-size:0.875rem}
table.accuracy th,table.accuracy td{padding:0.55rem 0.85rem;text-align:left;border-bottom:1px solid var(--line-soft);vertical-align:top}
table.accuracy th{font-weight:600;color:var(--ink);background:var(--surface);white-space:nowrap}
table.accuracy td.num{text-align:right;font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.8125rem;white-space:nowrap}
table.accuracy th.num{text-align:right}
table.accuracy td.ours{color:var(--accent-deep);font-weight:500}
table.accuracy td.mark{color:var(--ink-3);font-size:0.8125rem}
table.accuracy tr:last-child td{border-bottom:0}
table.accuracy td{vertical-align:middle}
table.accuracy td.mark{white-space:nowrap}
table.accuracy td.mark div{display:inline-flex;flex-direction:column;align-items:center}
table.accuracy td.mark span{margin-top:0.1rem;text-align:center}
.strip{display:block}
.strip-axis{stroke:var(--line);stroke-width:1}
.strip-band{fill:var(--accent-soft);stroke:var(--accent-line);stroke-width:1}
.strip-real{stroke:var(--ink);stroke-width:2;stroke-linecap:round}
.strip-ours{fill:var(--accent-deep);stroke:var(--card);stroke-width:2}
.strip-key{display:flex;flex-wrap:wrap;gap:0.4rem 1.25rem;margin:0.75rem 0 0;font-size:0.8125rem;color:var(--ink-3)}
.strip-key span{display:inline-flex;align-items:center;gap:0.45rem}
.strip-key i{display:inline-block}
.strip-key .k-real{width:2px;height:14px;background:var(--ink);border-radius:1px}
.strip-key .k-ours{width:9px;height:9px;border-radius:50%;background:var(--accent-deep)}
.strip-key .k-band{width:18px;height:10px;border-radius:3px;background:var(--accent-soft);border:1px solid var(--accent-line)}

.fork{margin:0}
.fork-plot{display:grid;grid-template-columns:2.4rem minmax(0,1fr);grid-template-rows:auto 1.6rem}
.fork-area{grid-column:2;grid-row:1;position:relative;height:17rem;
  border-left:1px solid var(--line);border-bottom:1px solid var(--line)}
.fork-area svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.fork-area path,.fork-area line{fill:none;vector-effect:non-scaling-stroke}
.fork .grid{stroke:var(--line-soft);stroke-width:1}
.fork .past{stroke:var(--ink-3);stroke-width:1.5}
.fork .calm{stroke:var(--ink);stroke-width:1.5}
.fork .hiked{stroke:var(--accent);stroke-width:2}
.fork .forkline{stroke:var(--accent-line);stroke-width:1;stroke-dasharray:4 4}
.fork-y{grid-column:1;grid-row:1;position:relative}
.fork-x{grid-column:2;grid-row:2;position:relative}
.tick,.day{position:absolute;font:400 0.6875rem/1 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-3);white-space:nowrap}
.tick{right:0.45rem;transform:translateY(-50%)}
.day{top:0.45rem;transform:translateX(-50%)}
.day:first-child{transform:none}
.day:last-child{transform:translateX(-100%)}
.fork-key{display:flex;flex-wrap:wrap;gap:0.3rem 1.2rem;margin:0.6rem 0 0 2.4rem;
  font:400 0.75rem/1.4 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-3)}
.key::before{content:"";display:inline-block;width:1.1rem;height:0;margin:0 0.4rem 0.2rem 0;
  vertical-align:middle;border-top:2px solid var(--ink-3)}
.key-calm{color:var(--ink)}
.key-calm::before{border-top-color:var(--ink)}
.key-hiked{color:var(--accent)}
.key-hiked::before{border-top-color:var(--accent)}
.fork-caption{font-size:0.875rem;color:var(--ink-3);margin:0.9rem 0 0}

.plan-explain{margin-top:1.75rem;padding-top:1.75rem;border-top:1px solid var(--line)}
.plan-explain h2{margin:0 0 1rem}
.plan-explain > p{color:var(--ink-2)}
.accuracy-more{margin-top:1.2rem}
.trust{list-style:none;margin:1rem 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}
.trust li{border:1px solid var(--line);border-radius:6px;background:var(--card);padding:1rem 1.1rem}
.trust h3{font-size:1.0625rem;margin:0 0 0.4rem}
.trust p{margin:0;color:var(--ink-2);font-size:0.9375rem}
.trust.pair{grid-template-columns:repeat(2,minmax(0,1fr))}
.limits-more{margin:1.25rem 0 0;padding:0.85rem 1.1rem;border-left:3px solid var(--accent);
  background:var(--accent-soft);border-radius:0 6px 6px 0;color:var(--ink)}
.contact{padding-top:3rem}
.contact .lede{max-width:35rem}
.contact-form{max-width:560px}

.contact-form{display:grid;gap:1rem;margin-top:1.5rem}
.contact-form .field{display:grid;gap:0.35rem;font-weight:500;color:var(--ink)}
.contact-form input,.contact-form select,.contact-form textarea{font:inherit;font-weight:400;color:var(--ink);
  background:var(--card);border:1px solid var(--line);border-radius:6px;padding:0.6rem 0.75rem}
.contact-form textarea{resize:vertical}
.contact-form button{justify-self:start}
.contact-form .botcheck{display:none}
.form-status{margin:0;color:var(--ink-2)}
.form-status:empty{display:none}
.form-note{margin:0;color:var(--ink-3);font-size:0.9375rem}
.legal{padding-top:3rem}
.legal .prose{max-width:none}
.legal .pg-overline{font-size:1.0625rem;font-weight:500;color:var(--accent)}
.legal .pg-changed{color:var(--ink-3);font-size:0.875rem}
.legal .callout{border:1px solid var(--amber);border-radius:6px;padding:0.8rem 1rem;margin:1rem 0 1.5rem;color:var(--ink)}
.legal .card{max-width:none;width:auto;border:1px solid var(--accent-line);border-radius:8px;background:var(--accent-soft);padding:1rem 1.2rem;margin-bottom:1.5rem}
.legal h2{margin-top:2rem}
.legal .card h2{margin-top:0}
.legal p,.legal li{color:var(--ink-2)}
.legal .plain-list{padding-left:1.2rem;margin-bottom:1rem}
.legal .tablebox{overflow-x:auto;margin-bottom:1rem}
.legal table{border-collapse:collapse;width:100%;font-size:0.875rem}
.legal td,.legal th{border-bottom:1px solid var(--line);padding:0.5rem 0.6rem;text-align:left;vertical-align:top}
.legal .stack-title{color:var(--ink);font-weight:500}
.legal .mono{font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.875em}
.app-shot{margin:1.2rem 0 0;padding:0.9rem 0.6rem 0.7rem;border:1px solid var(--line);border-radius:8px;
  background:var(--card);box-shadow:0 18px 50px rgba(16,26,24,0.10)}
.app-shot img{display:block;width:100%;height:auto}
.app-shot .shot-narrow{display:none}
@media (max-width:760px){.app-shot .shot-wide{display:none}.app-shot .shot-narrow{display:block}}
.fgroup .app-shot{grid-column:1 / -1;margin-top:0.5rem}
.sub-head{font-size:1.375rem;margin:0 0 0.4rem}

.plan-name{display:inline;font-family:'Source Serif 4',ui-serif,Georgia,serif;font-size:1.125rem;font-weight:600;color:var(--ink)}
.price{display:block;font-family:'Source Serif 4',ui-serif,Georgia,serif;font-size:1.25rem;font-weight:600;color:var(--accent-deep);margin-top:0.2rem}

.login{font-size:0.875rem;color:var(--ink-2)}
.split-fork{grid-template-columns:minmax(0,22rem) minmax(0,1fr);align-items:center;margin-top:0}

.fgroup{display:grid;grid-template-columns:minmax(0,17rem) minmax(0,1fr);gap:1.5rem 2.5rem;
  padding-top:1.75rem;margin-top:1.75rem;border-top:1px solid var(--line)}
.fgroup-head h2{font-size:1.5rem}
.fgroup-head p{color:var(--ink-2);font-size:0.9375rem}
.fgroup-head .go{font-weight:500}
.fgrid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.4rem 2rem}
.fgrid h3{font-family:'Public Sans',system-ui,-apple-system,sans-serif;font-size:1rem;letter-spacing:0;margin-bottom:0.3rem}
.fgrid h3::before{content:"";display:inline-block;width:0.45rem;height:0.45rem;border-radius:2px;
  background:var(--accent);margin:0 0.55rem 0.12rem 0}
.fgrid p{margin:0;font-size:0.9375rem;color:var(--ink-2)}

.plan-cards{list-style:none;margin:2rem 0 0;padding:0;display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));gap:0.9rem}
.plan-card{border:1px solid var(--line);border-radius:8px;background:var(--card);padding:1.25rem 1.2rem;
  display:grid;grid-row:span 6;grid-template-rows:subgrid;row-gap:0;align-content:start}
.plan-card.plan-oss{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset}
.plan-card .plan-name{font-size:1.25rem;margin:0}
.plan-card .price{font-size:1.5rem;margin:0.3rem 0 0.4rem}
.plan-who{font-size:0.875rem;color:var(--ink-2);margin:0 0 1rem}
.plan-limits-head{margin:0 0 0.45rem;font-size:0.8125rem;font-weight:600;color:var(--ink-2)}
.plan-facts{margin:0 0 1rem;display:grid;gap:0.7rem;align-content:start}
.plan-facts div{display:flex;flex-direction:column}
.plan-facts dd{order:-1;margin:0;font-size:1.0625rem;font-weight:600;color:var(--ink);line-height:1.3}
.plan-facts dt{font-size:0.8125rem;color:var(--ink-2)}
.plan-month{margin:0 0 1.2rem;padding-top:0.9rem;border-top:1px solid var(--line);font-size:0.875rem}
.plan-month p{margin:0;color:var(--ink-2)}
.plan-usage{margin-top:2.5rem}
.plan-usage h2{margin:0 0 0.6rem}
.plan-usage > p{color:var(--ink-2)}
.plan-table{width:100%;border-collapse:collapse;font-size:0.9375rem}
.plan-table th,.plan-table td{text-align:left;padding:0.55rem 0.75rem 0.55rem 0;border-bottom:1px solid var(--line)}
.plan-table thead th{font-size:0.8125rem;color:var(--ink-2);font-weight:600}
.plan-table tbody th{font-weight:500}
.plan-ent{margin-top:2.5rem;padding:1.1rem 1.2rem;border:1px dashed var(--line);border-radius:8px;
  display:flex;align-items:center;justify-content:space-between;gap:1rem 1.5rem;flex-wrap:wrap}
.plan-ent p{margin:0;max-width:40rem}
.plan-go{margin:0;align-self:end}

.skip{position:absolute;left:-999px;top:0.5rem;z-index:20;background:var(--card);padding:0.4rem 0.7rem;
  border:1px solid var(--accent);border-radius:6px}
.skip:focus{left:0.5rem}
.soon{font:500 0.75rem/1 'Spline Sans Mono',ui-monospace,monospace;letter-spacing:0.04em;color:var(--accent-deep);
  background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:99px;
  padding:0.4rem 0.7rem;white-space:nowrap}
a.soon:hover{text-decoration:none;border-color:var(--accent)}
.tag{display:inline-block;font-size:0.75rem;font-weight:500;line-height:1;
  color:var(--accent-deep);background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:5px;padding:0.3rem 0.5rem;white-space:nowrap}
.tag::first-letter{text-transform:uppercase}
.tag-soon{color:var(--ink-2);background:var(--surface);border-style:dashed;border-color:var(--ink-3)}

.code-col{display:flex;flex-direction:column;gap:0.8rem;min-width:0}
.output{display:flex;flex-direction:column;gap:0.3rem}
.output-head{margin:0;font:500 0.6875rem/1.3 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-3);letter-spacing:0.04em}
.output .code{background:var(--card);color:var(--ink)}
.section > .go{margin-top:1.1rem;font-weight:500}

table.versus{border-collapse:collapse;width:100%;font-size:0.9375rem}
table.compare{border-collapse:collapse;width:100%;min-width:52rem;font-size:0.875rem}
table.compare th,table.compare td{padding:0.6rem 0.85rem;text-align:left;vertical-align:top;border-bottom:1px solid var(--line-soft)}
table.compare thead th{font-weight:600;color:var(--ink);background:var(--surface)}
table.compare tbody tr:first-child td{background:var(--accent-soft)}
table.compare tr:last-child td{border-bottom:0}
ul.sources{padding-left:1.1rem;font-size:0.9375rem}
.videos{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(18rem,1fr));gap:2rem 1.5rem}
.video-card{display:block;color:var(--ink)}
.video-card:hover{text-decoration:none;color:var(--ink)}
.video-thumb{position:relative;display:block;aspect-ratio:16 / 9;overflow:hidden;margin-bottom:0.9rem;
  border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.video-thumb img{display:block;width:100%;height:100%;object-fit:cover;transition:transform 0.35s ease}
.video-card:hover .video-thumb img{transform:scale(1.03)}
.video-play{position:absolute;inset:0;margin:auto;width:3.5rem;height:3.5rem;border-radius:50%;
  display:grid;place-items:center;background:rgba(16,26,24,0.72);box-shadow:0 6px 20px rgba(16,26,24,0.25);
  transition:background 0.2s ease,transform 0.2s ease}
.video-play svg{width:1.35rem;height:1.35rem;fill:#fff;margin-left:3px}
.video-card:hover .video-play{background:var(--accent);transform:scale(1.07)}
.video-time{position:absolute;right:0.6rem;bottom:0.6rem;padding:0.3rem 0.45rem;border-radius:4px;
  font:500 0.75rem/1 'Public Sans',system-ui,-apple-system,sans-serif;color:#fff;background:rgba(16,26,24,0.78)}
.video-title{display:block;font:600 1.125rem/1.3 'Source Serif 4',ui-serif,Georgia,serif;letter-spacing:-0.01em;margin:0 0 0.3rem}
.video-card:hover .video-title{color:var(--accent-deep)}
.video-said{display:block;font-size:0.9375rem;line-height:1.55;color:var(--ink-2)}
.watch.hero{padding-bottom:0.5rem}
.watch .eyebrow a{color:inherit}
.watch-player{padding-top:0.5rem}
.watch-video{margin:0}
.watch-yt,.watch-video iframe{display:block;width:100%;height:auto;aspect-ratio:16 / 9;background:#000;border-radius:10px;
  border:1px solid var(--line-soft)}
.watch-yt{position:relative;overflow:hidden}
.watch-yt img{display:block;width:100%;height:100%;object-fit:cover}
.watch-yt:hover .video-play{background:var(--accent);transform:scale(1.07)}
.watch-video figcaption{margin-top:0.6rem;font-size:0.875rem;color:var(--ink-3)}
.watch-notes{display:grid;grid-template-columns:minmax(0,42rem) minmax(0,1fr);gap:0 3rem;align-items:start}
.watch-notes > .prose:last-child{grid-column:1}
.watch-side{grid-column:2;grid-row:1 / span 2;position:sticky;top:5rem}
.watch-notes h2{font-size:1.25rem;margin:0 0 0.8rem}
.watch-notes > .prose:last-child{margin-top:2.2rem}

.watch-notes p,.watch-figures li{line-height:1.65;color:var(--ink-2)}
.watch-notes p + p{margin-top:0.9rem}
.watch-chapters{margin:0;padding:0;list-style:none;counter-reset:ch;display:grid;gap:0.45rem}
.watch-chapters li{counter-increment:ch;display:flex;gap:0.7rem;align-items:baseline;color:var(--ink)}
.watch-chapters li::before{content:counter(ch);font:500 0.8125rem/1 'Spline Sans Mono',ui-monospace,monospace;color:var(--accent);min-width:1.1rem}
.watch-figures{margin:0.9rem 0 0;padding-left:1.1rem;display:grid;gap:0.6rem}
@media (max-width:860px){.watch-notes{grid-template-columns:minmax(0,1fr)}
  .watch-side{grid-column:1;grid-row:auto;position:static;margin-top:2rem}
}
.video-modal{width:min(64rem,calc(100vw - 2rem),calc((100vh - 7rem) * 16 / 9));max-width:none;padding:0;border:0;border-radius:12px;
  background:#0B100F;color:#fff;box-shadow:0 30px 80px rgba(0,0,0,0.45);overflow:hidden}
.video-modal[open]{animation:video-in 0.2s ease}
/* Centred in the window. The dialog is the last child of its section, and
   `.section > :last-child` would otherwise take its bottom margin away. */
dialog.video-modal[open]{margin:auto}
.video-modal::backdrop{background:rgba(10,14,13,0.8);backdrop-filter:blur(3px)}
@keyframes video-in{from{opacity:0;transform:translateY(8px) scale(0.98)}to{opacity:1;transform:none}}
.video-modal-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:0.6rem 0.6rem 0.6rem 1.1rem}
.video-name{margin:0;font:600 1rem/1.3 'Public Sans',system-ui,-apple-system,sans-serif;color:#fff}
.video-close{flex:none;display:grid;place-items:center;width:2.25rem;height:2.25rem;border:0;border-radius:50%;
  background:rgba(255,255,255,0.1);cursor:pointer}
.video-close:hover{background:rgba(255,255,255,0.2)}
.video-close svg{width:1.1rem;height:1.1rem;fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round}
.video-frame{aspect-ratio:16 / 9;background:#000}
.video-frame iframe{display:block;width:100%;height:100%;border:0}
@media (prefers-reduced-motion: reduce){.video-modal[open]{animation:none}.video-thumb img,.video-play{transition:none}}
.page-compare .prose{max-width:none}
table.versus th,table.versus td{padding:0.6rem 0.9rem;text-align:left;vertical-align:top;border-bottom:1px solid var(--line-soft)}
table.versus thead th{font-weight:600;color:var(--ink);background:var(--surface)}
table.versus thead td{background:var(--surface)}
table.versus tbody th{font-weight:500;color:var(--ink);width:24%}
table.versus tbody td{color:var(--ink-2);width:38%}
table.versus tbody td:last-child{color:var(--ink)}
table.versus tr:last-child th,table.versus tr:last-child td{border-bottom:0}

.jobs{list-style:none;margin:1.2rem 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0.9rem}
.jobs li{border:1px solid var(--line);border-radius:6px;background:var(--card);padding:1.05rem 1.15rem;
  display:flex;flex-direction:column}
.jobs h3{font-size:1.1875rem;margin-bottom:0.45rem}
.jobs p{color:var(--ink-2);font-size:0.9375rem}
.jobs .go{margin:auto 0 0;font-weight:500}

.limits{margin:2rem 0 2.2rem;padding:1rem 1.2rem;border-left:3px solid var(--amber);background:var(--card);
  border-radius:0 6px 6px 0}
.limits h3{margin-bottom:0.4rem}
.limits p{color:var(--ink-2)}
.limits .go{margin:0;font-weight:500}
#accuracy .sub-head{margin-top:0.5rem}

.editions{list-style:none;margin:1.2rem 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
.editions > li{border:1px solid var(--line);border-radius:8px;background:var(--card);padding:1.3rem 1.4rem;
  display:flex;flex-direction:column;gap:0.7rem}
.editions > li.edn-oss{border-color:var(--accent-line);box-shadow:0 0 0 1px var(--accent-line) inset}
.editions > li.edn-hosted{background:var(--surface);border-style:dashed}
.edn-top{display:flex;align-items:center;gap:0.7rem;flex-wrap:wrap}
.edn-top h3{font-size:1.3rem;margin:0}
.editions p{margin:0;color:var(--ink-2)}
.editions .go{margin-top:auto;padding-top:0.4rem;display:flex;flex-wrap:wrap;gap:0.6rem}
.ticks{list-style:none;margin:0;padding:0;display:grid;gap:0.4rem;font-size:0.9375rem;color:var(--ink)}
.ticks li{position:relative;padding-left:1rem}
.ticks li::before{content:"";position:absolute;left:0;top:0.55em;width:0.4rem;height:0.4rem;border-radius:99px;background:var(--accent)}
.edn-hosted .ticks li::before{background:none;border:1px solid var(--ink-3)}

.jump{display:flex;flex-wrap:wrap;gap:0.4rem 1.2rem;margin:1rem 0 0;font-weight:500}
.caps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.6rem 2rem}
.caps > li{min-width:0}
.caps > li.cap-wide{grid-column:1 / -1}
.cap-top{display:flex;flex-wrap:wrap;align-items:center;gap:0.4rem 0.5rem;margin-bottom:0.35rem}
.cap-top h3{font-family:'Public Sans',system-ui,-apple-system,sans-serif;font-size:1rem;letter-spacing:0;margin:0;flex-basis:100%}
.caps p{margin:0 0 0.45rem;font-size:0.9375rem;color:var(--ink)}
.caps p.why{color:var(--ink-2)}
.caps .go{font-weight:500;margin:0}
.caps .app-shot{margin-top:0.4rem}
.caps .split-fork{margin:0.8rem 0;grid-template-columns:minmax(0,1fr);gap:1.2rem;align-items:start}
.caps .split-fork .fork{max-width:34rem}
.caps pre code{background:none;border:0;padding:0;font-size:inherit;overflow-wrap:normal}
.caps p.fork-key{font-size:0.75rem;color:var(--ink-3);margin:0.6rem 0 0 2.4rem}
.shot-note{color:var(--ink-2)}
.plan-top{display:flex;flex-direction:column;align-items:flex-start;gap:0.45rem}
.page-plans .note{margin-top:1.2rem}

.site-foot{border-top:1px solid var(--line);margin-top:4rem;padding:2.5rem 0 3rem;font-size:0.875rem}
.foot-cols{display:grid;grid-template-columns:repeat(4,minmax(0,12rem));gap:1.5rem}
.foot-head{font-family:'Source Serif 4',ui-serif,Georgia,serif;font-weight:600;color:var(--ink);margin:0 0 0.4rem}
.foot-links{list-style:none;margin:0;padding:0;display:grid;gap:0.3rem}
.foot-links a{color:var(--ink-2)}
.foot-line{margin:2rem 0 0;color:var(--ink-3);font-size:0.8125rem}

@media (max-width: 900px){
  .split,.split-code,.split-fork,.trust,.prose-wide,.fgroup,.editions,.jobs{grid-template-columns:minmax(0,1fr)}
}
@media (max-width: 760px){
  .fgrid,.caps,.plan-cards{grid-template-columns:minmax(0,1fr)}
}
@media (max-width: 620px){
  .wrap{padding-left:1rem;padding-right:1rem}
  .head-row{flex-wrap:wrap;gap:0.6rem 1rem}
  .head-end .soon{display:none}
  table.versus{font-size:0.875rem}
  table.versus,table.versus thead,table.versus tbody{display:block}
  table.versus tr{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);border-bottom:1px solid var(--line-soft)}
  table.versus tr:last-child{border-bottom:0}
  table.versus th,table.versus td,table.versus tbody th,table.versus tbody td{padding:0.5rem 0.6rem;border-bottom:0;width:auto}
  table.versus thead td{display:none}
  table.versus thead tr{background:var(--surface)}
  table.versus tbody th{grid-column:1 / -1;padding-bottom:0}
  .caps .split-fork{grid-template-columns:minmax(0,1fr)}
  .site-nav{order:3;width:100%;gap:1rem}
  .menu-panel{left:0;grid-template-columns:minmax(0,1fr);width:min(21.5rem,calc(100vw - 2rem))}
  .hero{padding-top:2.2rem}
  .lede{font-size:1.0625rem}
  h2{font-size:1.4rem}
  .fork-area{height:13rem}
  .code{font-size:0.75rem}
  .install{max-width:100%}
  .foot-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  table.accuracy th,table.accuracy td{padding:0.5rem 0.55rem}
  .strip{width:96px;height:auto}
  table.accuracy td.mark,table.accuracy th{white-space:normal}
  table.accuracy,table.accuracy thead,table.accuracy tbody{display:block}
  table.accuracy tr{display:grid;grid-template-columns:4.6rem 5.4rem minmax(0,1fr);align-items:center;
    border-bottom:1px solid var(--line-soft)}
  table.accuracy tr:last-child{border-bottom:0}
  table.accuracy th,table.accuracy td{border-bottom:0}
  table.accuracy th:first-child{display:none}
  table.accuracy thead tr{background:var(--surface)}
  table.accuracy th:last-child{text-align:right}
  table.accuracy td:first-child{grid-column:1 / -1;padding-bottom:0;font-weight:500}
  table.accuracy td.mark div{align-items:flex-end;width:100%}
  .app-shot{padding:0;overflow:hidden}
  .chart text{font-size:22px}
}
@media print{
  .site-head{position:static}
  .copy,.chart-controls{display:none}
}
/* The engine band on the home page (enginefigure.py, product.engine_block).
   Its colours are the site's own tokens, so it is light on the product site
   and follows the reader's theme on the docs. The stress colour is its own. */
.eng{--e-ground:var(--card);--e-card:var(--ground);--e-surface:var(--surface);--e-ink:var(--ink);
  --e-ink-2:var(--ink-2);--e-ink-3:var(--ink-3);--e-line:var(--line);--e-soft:var(--line-soft);
  --e-accent:var(--accent);--e-heat:#A65628;border:1px solid var(--line);
  margin:1.6rem 0 0;background:var(--e-ground);color:var(--e-ink);border-radius:12px;
  padding:1.4rem;display:grid;gap:1.1rem}
.eng-head{display:grid;gap:0.35rem}
.eng-head h3{font:600 1.5rem/1.15 'Source Serif 4',ui-serif,Georgia,serif;color:var(--e-ink);margin:0}
.eng-head p{margin:0;color:var(--e-ink-3);font-size:0.875rem}
.eng-panel{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:1.1rem;align-items:stretch}
.eng-stage{position:relative;background:var(--e-card);border:1px solid var(--e-line);border-radius:10px;
  aspect-ratio:1/1;max-height:560px;width:100%;overflow:hidden;touch-action:none;cursor:grab;min-width:0}
.eng-stage canvas{display:block;width:100%;height:100%}
.eng-day{position:absolute;left:14px;top:12px;display:grid;gap:2px;pointer-events:none}
.eng-day b{font:500 1.6rem/1 'Spline Sans Mono',ui-monospace,monospace;font-variant-numeric:tabular-nums}
.eng-day span{font-size:0.75rem;color:var(--e-ink-3)}
.eng-status{position:absolute;right:12px;top:12px;font:500 0.6875rem/1 'Spline Sans Mono',ui-monospace,monospace;
  letter-spacing:0.08em;text-transform:uppercase;padding:0.4rem 0.6rem;border-radius:999px;
  border:1px solid var(--e-line);color:var(--e-ink-3);background:var(--e-card)}
.eng-status.hot{color:var(--e-heat);border-color:var(--e-heat)}
.eng-tip{position:absolute;pointer-events:none;max-width:16rem;background:var(--e-surface);border:1px solid var(--e-line);
  border-radius:8px;padding:0.6rem 0.75rem;font-size:0.8125rem;line-height:1.45;display:grid;gap:0.25rem;color:var(--e-ink-2)}
.eng-tip code{font:500 0.75rem/1.3 'Spline Sans Mono',ui-monospace,monospace;color:var(--e-accent);word-break:break-all}
.eng-tip .g{font-size:0.6875rem;color:var(--e-ink-3);text-transform:uppercase;letter-spacing:0.08em}
.eng-tip .v{font:400 0.75rem/1.3 'Spline Sans Mono',ui-monospace,monospace;color:var(--e-ink)}
.eng-side{display:grid;align-content:start;gap:0.5rem;min-width:0}
.eng-side h4{font:600 0.8125rem/1.2 'Public Sans',sans-serif;color:var(--e-ink-2);margin:0}
.eng-groups{list-style:none;margin:0;padding:0;display:grid;gap:1px}
.eng-groups li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 10px;padding:0.42rem 0.55rem;border-radius:6px}
.eng-groups li:hover{background:var(--e-surface)}
.eng-g{font-size:0.8125rem;font-weight:500;color:var(--e-ink);min-width:0}
.eng-g small{font-weight:400;color:var(--e-ink-3);margin-left:0.35rem;font-size:0.75rem}
.eng-v{font:400 0.75rem/1.4 'Spline Sans Mono',ui-monospace,monospace;color:var(--e-ink-2);
  text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.eng-m{grid-column:1/-1;height:5px;border-radius:3px;background:var(--e-soft);position:relative;overflow:hidden}
.eng-m b{position:absolute;top:0;bottom:0;width:2px;margin-left:-1px;background:var(--e-ink);box-shadow:0 0 0 1px var(--e-ground)}
.eng-m i{display:block;height:100%;width:0;background:var(--e-accent);border-radius:2px;transition:width .6s ease,background-color .8s ease}
.eng-m i.hot{background:var(--e-heat)}
.eng-time{display:grid;gap:0.6rem}
.eng-controls{display:flex;flex-wrap:wrap;gap:0.5rem;align-items:center}
.eng button{font:500 0.8125rem/1 'Public Sans',sans-serif;color:var(--e-ink);background:var(--e-surface);
  border:1px solid var(--e-line);border-radius:7px;padding:0.55rem 0.8rem;cursor:pointer}
.eng button:hover{border-color:var(--e-accent)}
.eng button.primary{background:var(--e-accent);color:var(--e-ground);border-color:var(--e-accent)}
.eng .eng-play{width:2.4rem;height:2.1rem;padding:0;display:inline-grid;place-items:center}
.eng .eng-play svg{width:15px;height:15px;fill:currentColor}
.eng .eng-spin{width:2.4rem;height:2.1rem;padding:0;display:inline-grid;place-items:center;color:var(--e-ink-3)}
.eng .eng-spin svg{width:16px;height:16px}
.eng .eng-spin[aria-pressed=true]{color:var(--e-accent);border-color:var(--e-accent)}
.eng .eng-play[data-state=paused] .i-pause,.eng .eng-play[data-state=playing] .i-play{display:none}
.eng button:focus-visible,.eng input:focus-visible{outline:2px solid var(--e-accent);outline-offset:2px}
.eng-key{margin-left:auto;font-size:0.75rem;color:var(--e-ink-3);display:flex;gap:0.9rem;flex-wrap:wrap}
.eng-key i{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:0.35rem}
.eng-spark{position:relative;height:56px}
.eng-spark canvas{position:absolute;inset:0;width:100%;height:100%}
.eng input[type=range]{width:100%;accent-color:var(--e-accent);margin:0}
.eng-note{margin:0;font-size:0.8125rem;color:var(--e-ink-3)}
.eng-note code{color:var(--e-ink-2)}
@media (max-width:860px){.eng-panel{grid-template-columns:minmax(0,1fr)}.eng-stage{max-height:none;aspect-ratio:5/6}
  .eng{padding:1rem}}

/* The Use Cases page: each card names its reader and ends on the answer. */
.cases .role{font-size:0.875rem;font-weight:500;color:var(--accent);margin:0 0 0.35rem}
.cases .verdict{color:var(--ink);font-weight:500;border-left:2px solid var(--accent);padding-left:0.7rem;margin:0.6rem 0 0.8rem}
/* Cards side by side share their rows, so the verdicts and links line up
   across a row whatever each description's length. */
@supports (grid-template-rows:subgrid){
  .jobs.cases li{display:grid;grid-row:span 5;grid-template-rows:subgrid;row-gap:0}
  .cases .verdict{align-self:start}
  .jobs.cases .go{align-self:end}
}

.pt-ch{margin:0;border:1px solid var(--line);border-radius:6px;background:var(--card);
  padding:1rem 1.1rem 0.9rem;display:grid;gap:0.7rem;min-width:0}
.pt-ch-title{font-size:0.875rem;font-weight:600;color:var(--ink);margin:0}
.pt-ch-sub{font-size:0.8125rem;color:var(--ink-3);margin:-0.45rem 0 0}
.pt-ch-plot{display:grid;grid-template-columns:3rem minmax(0,1fr);
  grid-template-rows:auto 1.5rem;margin-top:1.1rem}
.pt-ch-area{grid-column:2;grid-row:1;position:relative;height:15rem}
/* Clipped: with overflow visible, Chrome counts the drawing at its unscaled
   1000-unit width as page overflow, and the page scrolls sideways. */
.pt-ch-area svg{position:absolute;inset:0;width:100%;height:100%;overflow:hidden}
.pt-ch-area path,.pt-ch-area line{fill:none;vector-effect:non-scaling-stroke}
.pt-ch-area path{stroke-width:2;stroke-linejoin:round}
.pt-ch-area path.s0{stroke-width:2.25}
.pt-ch-area .grid{stroke:var(--line-soft);stroke-width:1}
.pt-ch-area .mark{stroke:var(--accent-line);stroke-width:1;stroke-dasharray:4 4}
.pt-ch-flags{position:absolute;inset:0;pointer-events:none}
.pt-ch-flag.end{transform:translateX(-100%)}
.pt-ch-flag.start{transform:none}
.pt-ch-flag{position:absolute;top:-1.15rem;transform:translateX(-50%);white-space:nowrap;
  font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.6875rem;color:var(--accent-deep);background:var(--card);padding:0 0.3rem}
.pt-ch-y{grid-column:1;grid-row:1;position:relative}
.pt-ch-tick{position:absolute;right:0.5rem;transform:translateY(-50%);
  font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.6875rem;color:var(--ink-3);white-space:nowrap}
.pt-ch-x{grid-column:2;grid-row:2;position:relative}
.pt-ch-day{position:absolute;top:0.35rem;transform:translateX(-50%);
  font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.6875rem;color:var(--ink-3);white-space:nowrap}
.pt-ch-day:first-child{transform:none}
.pt-ch-day:last-child{transform:translateX(-100%)}
.pt-ch-keys{display:flex;flex-wrap:wrap;gap:0.4rem 1.2rem;margin:0;font-size:0.8125rem;
  color:var(--ink-2)}
.pt-ch-key{display:inline-flex;align-items:center;gap:0.45rem}
.pt-ch-key i{width:0.9rem;height:3px;border-radius:2px;display:inline-block}
.pt-ch-key b{font-family:'Spline Sans Mono',ui-monospace,monospace;font-weight:500;font-size:0.75rem;color:var(--ink)}
.pt-ch-rows{display:grid;gap:0.55rem;margin-top:1.2rem}
.pt-ch-rule{position:absolute;top:-0.3rem;bottom:-0.3rem;pointer-events:none;
  left:calc(3.6rem + (100% - 7.2rem) * var(--at));border-left:1px dashed var(--red-mid)}
.pt-ch-rule em{position:absolute;top:-1.2rem;left:0;transform:translateX(-50%);
  font-style:normal;font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.6875rem;color:var(--red);white-space:nowrap}
.pt-ch-row{display:grid;grid-template-columns:min(11rem,40%) minmax(0,1fr);
  gap:0.9rem;align-items:center}
.pt-ch-cat{font-size:0.8125rem;color:var(--ink-2);text-align:right}
.pt-ch-bars{position:relative;display:grid;gap:3px;padding:0 3.6rem}
.pt-ch-bars::before{content:"";position:absolute;top:-0.2rem;bottom:-0.2rem;
  left:calc(3.6rem + (100% - 7.2rem) * var(--zero));border-left:1px solid var(--ink-3);opacity:0.5}
.pt-ch-bar{position:relative;height:0.8rem}
.pt-ch-bar i{position:absolute;top:0;bottom:0;border-radius:2px}
.pt-ch-bar em{position:absolute;top:50%;transform:translateY(-50%);font-style:normal;
  font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:0.6875rem;color:var(--ink-2);white-space:nowrap;padding:0 0.35rem}
.pt-ch-cap{font-size:0.8125rem;color:var(--ink-3);margin:0}
/* The site narrows every grid in `main` to one column below 900px, with
   !important. A chart's axis column, a bar's label column and a pair of
   tiles are the exceptions; bar labels go above their bars on a phone. */
@media (max-width:900px){
  .pt-ch-plot{grid-template-columns:2.6rem minmax(0,1fr) !important}
  .pt-ch-row{grid-template-columns:min(11rem,40%) minmax(0,1fr) !important}
  .pt-st{grid-template-columns:repeat(2,minmax(0,1fr)) !important}
}
@media (max-width:620px){
  .pt-st-val{font-size:1.25rem}
  .pt-ch-row{grid-template-columns:minmax(0,1fr) !important;gap:0.25rem}
  .pt-ch-cat{text-align:left}
  .pt-ch-area{height:12rem}
}

.pt-st{display:grid;grid-template-columns:repeat(auto-fit,minmax(10rem,1fr));gap:0.8rem}
.pt-st-tile{border:1px solid var(--line);border-radius:6px;background:var(--card);
  padding:0.8rem 1rem;display:grid;gap:0.2rem;align-content:start}
.pt-st-val{font-family:'Spline Sans Mono',ui-monospace,monospace;font-size:1.5rem;line-height:1.2;color:var(--ink);
  font-variant-numeric:tabular-nums}
.pt-st-tile:first-child .pt-st-val{color:var(--accent)}
.pt-st-lab{font-size:0.8125rem;color:var(--ink-3)}

.pt-vd{border:1px solid var(--accent-line);border-radius:8px;background:var(--accent-soft);
  padding:1.2rem 1.3rem;display:grid;gap:0.9rem}
.pt-vd > p:first-child{font-size:1.125rem;line-height:1.5;color:var(--accent-deep);
  font-weight:500}
.pt-vd p{color:var(--accent-deep)}
.pt-vd .pt-st-tile,.pt-vd .pt-ch{border-color:var(--accent-line)}

.article{max-width:44rem}
.article h2{font-size:1.375rem;margin:2.4rem 0 0.8rem}
.article > p,.article > ul > li,.article > ol > li{font-size:1.0625rem;line-height:1.7;color:var(--ink-2)}
.article > p{margin:0 0 1rem}
.article > ul,.article > ol{padding-left:1.2rem;margin:0 0 1rem}
.article .lede{font-size:1.1875rem;color:var(--ink)}
.article figure.pt-ch,.article .code-file,.article .output{margin:1.4rem 0 1.6rem}
.article .code{font-size:0.8125rem}
.code-file .code-name{display:flex;justify-content:space-between;align-items:center;margin:0 0 0.4rem;
  font:500 0.8125rem/1.3 'Spline Sans Mono',ui-monospace,monospace;color:var(--ink-3)}
.code-file .code{max-height:28rem;overflow:auto}
.article-meta{font-size:0.875rem;color:var(--ink-3);margin:0.4rem 0 0}
.guide-list{grid-template-columns:repeat(3,minmax(0,1fr))}
.hero .guide-list{margin-top:2rem}
.guide-hero{margin-top:2rem;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:1.5rem 2rem;align-items:center;border:1px solid var(--line);border-radius:10px;background:var(--card);padding:1.4rem}
.guide-hero .guide-thumb{margin:0}
.guide-thumb.guide-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:start;align-content:center;gap:0.5rem;padding:1.2rem}
.guide-stats .st{display:flex;flex-direction:column;gap:0.4rem;text-align:center}
.guide-stats b{font-family:'Source Serif 4',ui-serif,Georgia,serif;font-size:clamp(2.2rem,5vw,3.4rem);line-height:1;font-weight:600;color:var(--accent-deep)}
.guide-stats .st-bad b{color:var(--red)}
.guide-stats i{font-style:normal;font-size:0.875rem;line-height:1.35;color:var(--ink-2)}
.guide-hero h2{font-size:1.5rem;line-height:1.25;margin:0.2rem 0 0.6rem}
.guide-hero h2 a{color:var(--ink)}
.guide-hero h2 a:hover{color:var(--accent-deep)}
.guide-hero p{color:var(--ink-2)}
.guide-hero .eyebrow{margin:0}
.guide-hero p:last-child{margin:1rem 0 0}
@media (max-width:760px){.guide-hero{grid-template-columns:minmax(0,1fr)}}
.guide-list h2{font-size:1.125rem;margin:0 0 0.45rem}
.guide-thumb{display:block;aspect-ratio:2 / 1;margin:0 0 1rem;border-radius:7px;background:var(--surface);
  border:1px solid var(--line-soft);overflow:hidden}
.guide-thumb svg{display:block;width:100%;height:100%}
.guide-thumb polyline{fill:none;stroke-width:2;stroke-linejoin:round;vector-effect:non-scaling-stroke}
.guide-thumb polyline.t0{stroke-width:2.5}
.guide-thumb .zero{stroke:var(--line);stroke-width:1;vector-effect:non-scaling-stroke}
.guide-thumb .rule{stroke:var(--red);stroke-width:1.2;stroke-dasharray:5 4;vector-effect:non-scaling-stroke}
@media (max-width:1000px){.guide-list{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.guide-list{grid-template-columns:minmax(0,1fr)}}
.guide-list h2 a,.guide-list h3 a{color:var(--ink)}
.guide-list h2 a:hover,.guide-list h3 a:hover{color:var(--accent-deep)}
/* A guide and, beside it, the others. The article keeps its reading width
   and the column takes what is left of the page; under 1000px the column
   drops below the article as a row of cards. */
.guide-body{display:grid;grid-template-columns:minmax(0,41rem) minmax(0,1fr);gap:3rem;align-items:start}
.guide-body .article{max-width:none}
.guide-rail{border-left:1px solid var(--line);padding-left:1.75rem}
.findings{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:6px;background:var(--card);padding:1rem 1.2rem;margin:1.5rem 0 2rem}
.findings-head{margin:0 0 0.5rem;font-weight:600}
.findings ul{margin:0;padding-left:1.1rem;display:grid;gap:0.45rem}
.guide-rail h2{font-size:1.0625rem;margin:0 0 1rem}
.rail-demo{margin:0 0 2.2rem}
.guide-rail .videos{grid-template-columns:minmax(0,1fr);margin:0}
.guide-rail .guide-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:minmax(0,1fr);gap:1.6rem}
.guide-rail .guide-thumb{margin:0 0 0.6rem;border-radius:6px}
.guide-rail h3{font-size:1rem;line-height:1.3;margin:0 0 0.3rem}
.guide-rail p{font-size:0.875rem;line-height:1.5;color:var(--ink-3);margin:0}
@media (max-width:1000px){
  .guide-body{grid-template-columns:minmax(0,1fr)}
  .guide-rail{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:1.75rem}
  .guide-rail .guide-list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .guide-rail .videos{max-width:calc(50% - 0.8rem)}
}
@media (max-width:640px){.guide-rail .guide-list{grid-template-columns:minmax(0,1fr)}
  .guide-rail .videos{max-width:none}}