@font-face{font-family:"Newsreader";font-style:normal;font-weight:400 700;font-display:swap;
  src:url("fonts/newsreader-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+2013-2014,U+2018-201D,U+201E,U+2212;}
@font-face{font-family:"Newsreader";font-style:normal;font-weight:400 700;font-display:swap;
  src:url("fonts/newsreader-latin-ext.woff2") format("woff2");unicode-range:U+0100-024F,U+1E00-1EFF,U+20AC;}
@font-face{font-family:"Atkinson";font-style:normal;font-weight:400 700;font-display:swap;
  src:url("fonts/atkinson-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+2013-2014,U+2018-201D,U+201E,U+2212;}
@font-face{font-family:"Atkinson";font-style:normal;font-weight:400 700;font-display:swap;
  src:url("fonts/atkinson-latin-ext.woff2") format("woff2");unicode-range:U+0100-024F,U+1E00-1EFF;}
@font-face{font-family:"PlexMono";font-style:normal;font-weight:400 600;font-display:swap;
  src:url("fonts/plexmono-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+2013-2014,U+2018-201D,U+201E,U+2212;}
@font-face{font-family:"PlexMono";font-style:normal;font-weight:400 600;font-display:swap;
  src:url("fonts/plexmono-latin-ext.woff2") format("woff2");unicode-range:U+0100-024F;}
:root{
  --paper:#f4f1e8;--surface:#e9e4d3;--ink:#23211b;--ink-2:#5a5344;
  --line:#cfc6ab;--accent:#7a4e00;--link:#1d4fa3;
  --card:#faf8f0;--shadow:0 1px 0 rgba(35,33,27,.08),0 12px 32px -18px rgba(35,33,27,.35);
  --ease:cubic-bezier(.2,.7,.2,1);
}
[data-theme="dark"]{
  --paper:#161511;--surface:#22211a;--ink:#efe9d8;--ink-2:#b3ab93;
  --line:#3f3a2c;--accent:#d9a83c;--link:#9db9f2;
  --card:#1d1c16;--shadow:0 1px 0 rgba(0,0,0,.4),0 12px 32px -18px rgba(0,0,0,.6);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#161511;--surface:#22211a;--ink:#efe9d8;--ink-2:#b3ab93;
  --line:#3f3a2c;--accent:#d9a83c;--link:#9db9f2;
  --card:#1d1c16;--shadow:0 1px 0 rgba(0,0,0,.4),0 12px 32px -18px rgba(0,0,0,.6);
}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:"Newsreader",Georgia,serif;font-size:1.125rem;line-height:1.6}
main{display:block}
h1,h2,h3,.tag,.hud-step,.lab,.col-title,.lrow-fig,.lrow-date,.lrow-verdict,.lrow-src,.ltotal-label,.ltotal-way{font-family:"Atkinson",system-ui,sans-serif}
h1{font-size:clamp(1.7rem,4.5vw,2.6rem);line-height:1.15;margin:0 0 .6rem;letter-spacing:-.01em}
h2{font-size:1.5rem;line-height:1.25;margin:0 0 .8rem}
h3{font-size:1.12rem;margin:1.4rem 0 .4rem}
p{margin:0 0 1rem}
a{color:var(--link)}
.small{font-size:.95rem;color:var(--ink-2)}
.lede{font-size:1.2rem}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.6rem 1rem;z-index:50}
.skip:focus{left:0}
.topbar{position:sticky;top:0;z-index:40;display:flex;justify-content:space-between;align-items:center;
  padding:.5rem 1rem;background:color-mix(in srgb,var(--paper) 88%,transparent);
  border-bottom:1px solid var(--line);backdrop-filter:blur(6px)}
.topbar .home svg{width:26px;height:26px;display:block;color:var(--accent)}
.topbar nav{display:flex;gap:.6rem;align-items:center}
.edition{font-family:"Atkinson",system-ui,sans-serif;font-size:.95rem;text-decoration:none;border:1px solid var(--line);
  border-radius:999px;padding:.3rem .8rem;color:var(--ink)}
#theme-toggle{font:inherit;font-size:.9rem;background:none;border:1px solid var(--line);border-radius:999px;
  padding:.35rem .8rem;color:var(--ink);cursor:pointer;min-height:44px}
.hero{position:relative}
.hero picture{display:block}
.hero img{display:block;width:100%;height:min(72vh,34rem);object-fit:cover}
.hero-card{max-width:44rem;margin:-7rem auto 0;position:relative;background:var(--card);
  border:1px solid var(--line);border-radius:14px;padding:1.6rem 1.6rem 1.2rem;box-shadow:var(--shadow);
  margin-left:max(1rem,calc(50% - 22rem));margin-right:max(1rem,calc(50% - 22rem))}
.deck{font-size:1.25rem;margin:0 0 .8rem}
.jump a,.hint{font-family:"Atkinson",system-ui,sans-serif;font-size:.95rem}
.hint{color:var(--ink-2);margin:0}
.hero-cap{position:absolute;z-index:2;left:1rem;top:1rem;max-width:20rem;margin:0;padding:.5rem .8rem;font-size:.8rem;line-height:1.35;color:var(--ink-2);background:var(--card);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow)}
@media (max-width:48rem){.hero-cap{max-width:min(20rem,calc(100vw - 2rem))}}
@media (min-width:80rem){.hero-cap{left:auto;right:1rem}}
.paper{max-width:44rem;margin:0 auto;padding:3.2rem 1rem 0.5rem}
.paper:last-child{padding-bottom:4rem}
.share-top{padding-top:1.6rem;padding-bottom:0}
/* scrolly */
.scrolly{max-width:78rem;margin:0 auto;padding:0 1rem}
.flow{max-width:27rem}
section[id]{scroll-margin-top:4.5rem}
.stage{position:static;margin:0 0 1rem}
.has-js .stage{position:sticky}
.step{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1.1rem 1.2rem;
  margin:0 0 1.2rem;box-shadow:var(--shadow)}
.step:last-child{margin-bottom:1.2rem}
.has-js .step{margin-bottom:60vh}
.has-js .step:last-child{margin-bottom:20vh}
.step .tag{font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);margin:0 0 .3rem}
.step h3{margin:0 0 .4rem;font-size:1.2rem}
.step p{margin:0}
.step.active{border-color:var(--accent)}
.stage-hud{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.7rem .9rem;margin-bottom:.6rem}
.hud-step{margin:0 0 .5rem;font-size:.98rem;min-height:2.6em}
.hud-rows{display:flex;flex-wrap:wrap;gap:.4rem;margin:0 0 .5rem}
.hud-rows button{font:inherit;font-family:"PlexMono",monospace;font-size:.9rem;background:var(--surface);
  border:1px solid var(--line);border-radius:999px;padding:.45rem 1rem;cursor:pointer;color:var(--ink);min-height:44px}
.hud-rows button:hover,.hud-rows button:focus-visible{border-color:var(--accent);color:var(--accent)}
.hud-rows button[aria-pressed="true"]{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.hud-check{margin:0 0 .3rem}
.reckon{font-family:"PlexMono",monospace;font-size:.95rem;margin:.5rem 0 0}
.readout{margin:.5rem 0 0;font-size:.98rem}
.readout:not([hidden]){border-left:4px solid var(--accent);padding-left:.8rem}
.iso-hint{font-size:.88rem;color:var(--ink-2);margin:.5rem 0 0}
.ghost{font:inherit;font-size:.92rem;background:none;border:1px solid var(--line);border-radius:999px;
  padding:.45rem 1rem;color:var(--ink);cursor:pointer;min-height:44px}
.ghost:hover,.ghost:focus-visible{border-color:var(--accent);color:var(--accent)}
#ledger{display:block;width:100%;height:auto;background:var(--card);border:1px solid var(--line);border-radius:12px}
#ledger .col-rule{stroke:var(--line);stroke-width:2}
#ledger .col-rule.faint{stroke-dasharray:2 8;stroke-linecap:round}
#ledger .col-title{font-size:30px;font-weight:700;letter-spacing:2px;fill:var(--ink-2)}
#ledger .plate{fill:var(--surface);stroke:var(--line);stroke-width:2}
#ledger .dateplate{fill:none;stroke:var(--line);stroke-width:2}
#ledger .lrow-fig{font-family:"PlexMono",monospace;font-size:34px;font-weight:600;fill:var(--ink)}
#ledger .lrow-date{font-size:28px;fill:var(--ink)}
#ledger .lrow-verdict{font-size:28px;fill:var(--ink-2)}
#ledger .lrow-src{font-size:26px;fill:var(--ink-2)}
#ledger .ltotal-label{font-size:27px;fill:var(--ink-2)}
#ledger .ltotal-way{font-family:"PlexMono",monospace;font-size:28px;font-weight:600;fill:var(--ink)}
#ledger .plate-l,#ledger .plate-r{transition:transform 1s var(--ease)}
#ledger .lrow-verdict,#ledger .ltotal{transition:opacity .8s var(--ease)}
html.js #ledger .lrow{opacity:.3}
html.js #ledger .lrow.lit{opacity:1}
html.js #ledger .plate-l{transform:translateX(-46px)}
html.js #ledger .plate-r{transform:translateX(46px)}
html.js #ledger .lrow.lit .plate-l,html.js #ledger .lrow.lit .plate-r{transform:translateX(0)}
html.js #ledger .lrow.lit .plate{stroke:var(--accent)}
html.js #ledger .lrow .lrow-verdict{opacity:0}
html.js #ledger .lrow.lit .lrow-verdict{opacity:1}
html.js #ledger .ltotal{opacity:.25}
html.js #ledger.lit-total .ltotal{opacity:1}
html.js #ledger[data-focus] .lrow{opacity:.18}
html.js #ledger[data-focus] .lrow.focus{opacity:1}
html.js #ledger[data-focus] .ltotal{opacity:.18}
.fig-twin{margin-top:.6rem;font-size:.92rem}
.fig-twin summary{cursor:pointer;font-family:"Atkinson",system-ui,sans-serif;min-height:44px;display:inline-block;line-height:44px}
.fig-twin ul{margin:.4rem 0 0;padding-left:1.2rem}
/* figures */
.fig{margin:1.6rem 0}
.fig-frame{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.6rem}
.fig-frame img{display:block;width:100%;height:auto;border-radius:6px}
.fig-frame.tall img{max-width:26rem;margin:0 auto}
figcaption{font-size:.92rem;color:var(--ink-2);margin-top:.5rem}
/* sources */
.method{padding-left:1.3rem}
.method li{margin-bottom:.7rem}
.see-also{border-top:1px solid var(--line);padding-top:1rem}
.foot{max-width:44rem;margin:2rem auto 0;padding:1.5rem 1rem 3rem;border-top:1px solid var(--line);
  font-family:"Atkinson",system-ui,sans-serif;font-size:.92rem;color:var(--ink-2)}
.foot p{margin:0 0 .4rem}
.rail{display:none}
.share-row{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center}
.share-row .lab{font-size:.95rem;margin-inline-end:.3rem}
.share-row a,.share-row button{display:inline-grid;place-items:center;flex:none;width:2.5rem;height:2.5rem;padding:0;border-radius:50%;border:1px solid var(--sr-line,color-mix(in srgb,currentColor 28%,transparent));background:transparent;color:var(--sr-ink,inherit);text-decoration:none;cursor:pointer;font:inherit;transition:color .15s,border-color .15s}
.share-row a:hover,.share-row button:hover,.share-row a:focus-visible,.share-row button:focus-visible{color:var(--sr-acc,inherit);border-color:var(--sr-acc,currentColor)}
.share-row [hidden]{display:none}
@media (pointer:coarse){.share-row a,.share-row button{width:2.75rem;height:2.75rem}}
@media (max-width:30rem){.share-row .lab{flex-basis:100%;margin:0 0 .15rem}}
.share-status{font-size:.92rem;color:var(--sr-ok,inherit);min-height:1.2em;margin:.4rem 0 0}
.share-status:empty{display:none}
.share-field{display:block;width:100%;max-width:36rem;margin-top:.4rem;font:inherit;font-size:.9rem}
@media (min-width:60rem){
  .scrolly{display:grid;grid-template-columns:27rem 1fr;gap:2.5rem;align-items:start}
  .flow{grid-column:1;grid-row:1}
  .stage{grid-column:2;grid-row:1}
  .has-js .stage{top:4rem;height:calc(100lvh - 4.5rem);display:flex;flex-direction:column;min-height:0}
  .stage-hud{flex:none;max-height:46%;overflow:auto}
  #ledger{flex:1;min-height:0}
  .fig-twin{flex:none;max-height:22%;overflow:auto}
}
@media (min-width:80rem){
  .rail{display:flex;position:fixed;left:.7rem;top:50%;transform:translateY(-50%);flex-direction:column;
    gap:.15rem;z-index:30;background:var(--card);border:1px solid var(--line);
    border-radius:14px;padding:.6rem;box-shadow:var(--shadow)}
  .rail a{position:relative;display:flex;align-items:center;justify-content:center;text-decoration:none;
    min-width:44px;min-height:44px}
  .rail .dot{width:.65rem;height:.65rem;border-radius:50%;border:2px solid var(--ink-2);flex:none}
  .rail a[aria-current="true"] .dot{background:var(--accent);border-color:var(--accent)}
  .rail .lbl{display:none;position:absolute;left:calc(100% + .6rem);top:50%;transform:translateY(-50%);
    white-space:nowrap;background:var(--card);border:1px solid var(--line);border-radius:8px;
    padding:.3rem .7rem;color:var(--ink);font-size:.85rem;font-family:"Atkinson",system-ui,sans-serif}
  .rail a:hover .lbl,.rail a:focus-visible .lbl{display:block}
}
@media (max-width:59.99rem){
  .scrolly{padding:0 .75rem}
  .flow{max-width:44rem;margin:0 auto}
  .has-js .stage{top:3.4rem;z-index:20;display:flex;flex-direction:column;background:var(--paper)}
  .stage-hud{font-size:.9rem}
  .hud-step{min-height:0;margin-bottom:.3rem}
  .hud-rows{flex-wrap:nowrap;overflow-x:auto;padding-bottom:.25rem;scrollbar-width:thin}
  .hud-rows button{flex:none}
  .iso-hint{display:none}
  #ledger{flex:none;width:100%;height:auto}
  .has-js .step{margin-bottom:30vh}
  .hero-card{margin-top:-4rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  #ledger .plate-l,#ledger .plate-r,#ledger .lrow-verdict,#ledger .ltotal{transition:none}
}