:root{
  --paper:#f6f4ee;--surface:#ffffff;--ink:#0f172a;--ink-2:#334155;--muted:#51607a;--line:#dcd8ca;--line-2:#e9e6db;
  --cobalt:#1d4ed8;--cobalt-d:#1e3a9e;--cobalt-l:#dbe6ff;--cyan:#0e7490;--cyan-l:#22d3ee;--amber:#f5b301;--amber-d:#92400e;--amber-l:#fff3cd;
  --night:#0a1530;--night-2:#10224d;--night-3:#1b3270;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,"Times New Roman",serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --radius:10px;--w:1160px;--shadow:0 1px 2px rgba(15,23,42,.06),0 6px 20px rgba(15,23,42,.06);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.65 var(--sans);-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
img{display:block}
a{color:var(--cobalt);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--cobalt-d)}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:3px}
.dark :focus-visible,.site-header :focus-visible{outline-color:var(--cyan-l)}
.skip{position:absolute;left:-999px;top:8px;background:var(--amber);color:#111;padding:.6rem 1rem;z-index:100;border-radius:6px;font-weight:600}
.skip:focus{left:8px}
.wrap{max-width:var(--w);margin:0 auto;padding:0 20px}
.narrow{max-width:760px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.18;color:var(--ink);margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.6vw,3.3rem);font-weight:700}
h2{font-size:clamp(1.5rem,2.8vw,2.05rem)}
h3{font-size:1.25rem}
p{margin:0 0 1em}
.eyebrow{font:600 .78rem/1 var(--sans);letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin:0 0 .8rem;display:block}
.dark .eyebrow{color:var(--cyan-l)}
.lead{font-size:1.2rem;color:var(--ink-2)}
.muted{color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* header */
.site-header{background:var(--night);color:#fff;position:sticky;top:0;z-index:50;border-bottom:1px solid #1e3a78}
.site-header .wrap{display:flex;align-items:center;gap:18px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;flex:none}
.brand:hover{color:#fff}
.brand svg{width:34px;height:34px;flex:none}
.brand b{display:block;font:700 1.2rem/1 var(--serif);letter-spacing:.01em}
.brand small{display:block;font:500 .68rem/1.3 var(--sans);letter-spacing:.14em;text-transform:uppercase;color:#9db4ef;margin-top:3px}
.nav{display:flex;gap:2px;margin-left:auto;align-items:center}
.nav a{color:#dbe6ff;text-decoration:none;font:500 .92rem/1 var(--sans);padding:.65rem .7rem;border-radius:6px}
.nav a:hover,.nav a[aria-current="page"]{background:var(--night-3);color:#fff}
.nav-toggle{display:none;margin-left:auto;background:transparent;border:1px solid #3a5bb0;color:#fff;border-radius:8px;padding:.5rem .75rem;font:600 .9rem var(--sans);cursor:pointer}
.hsearch{position:relative;flex:0 1 210px}
.hsearch input{width:100%;background:#0d1d42;border:1px solid #2c4a95;color:#fff;border-radius:8px;padding:.55rem .8rem;font:400 .92rem var(--sans)}
.hsearch input::placeholder{color:#8ea6e0}
.suggest{position:absolute;right:0;top:calc(100% + 6px);width:min(420px,92vw);background:#fff;color:var(--ink);border-radius:10px;box-shadow:0 12px 40px rgba(0,0,0,.3);padding:6px;display:none;z-index:60}
.suggest.open{display:block}
.suggest a{display:block;padding:.6rem .75rem;border-radius:7px;text-decoration:none;color:var(--ink);font-size:.95rem;line-height:1.35}
.suggest a:hover,.suggest a[aria-selected="true"]{background:var(--cobalt-l)}
.suggest small{display:block;color:var(--muted);font-size:.78rem}
.suggest .none{padding:.7rem .75rem;color:var(--muted);font-size:.92rem}

/* buttons, chips */
.btn{display:inline-flex;align-items:center;gap:.5rem;border:2px solid transparent;border-radius:8px;padding:.75rem 1.2rem;font:600 1rem/1.1 var(--sans);text-decoration:none;cursor:pointer;background:var(--cobalt);color:#fff}
.btn:hover{background:var(--cobalt-d);color:#fff}
.btn.amber{background:var(--amber);color:#111827}
.btn.amber:hover{background:#ffc933;color:#111827}
.btn.ghost{background:transparent;border-color:currentColor;color:inherit}
.btn.ghost:hover{background:rgba(255,255,255,.1);color:inherit}
.btn.light{background:#fff;color:var(--cobalt);border-color:var(--line)}
.btn.light:hover{background:var(--cobalt-l)}
.btn.sm{padding:.5rem .85rem;font-size:.9rem}
.btn[aria-pressed="true"]{background:var(--amber);color:#111827}
.chip{display:inline-block;font:600 .74rem/1 var(--sans);letter-spacing:.06em;text-transform:uppercase;padding:.38rem .6rem;border-radius:99px;background:var(--cobalt-l);color:var(--cobalt-d);text-decoration:none}
a.chip:hover{background:#c5d6ff}
.chip.amber{background:var(--amber-l);color:var(--amber-d)}
.chip.ok{background:#dcfce7;color:#14532d}

/* hero */
.dark{background:var(--night);color:#e7eeff}
.dark h1,.dark h2,.dark h3{color:#fff}
.dark a{color:#8fb4ff}
.dark .muted{color:#a9bbe6}
.hero{position:relative;overflow:hidden;padding:72px 0 80px;background-color:var(--night)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.hero h1{max-width:16ch}
.hero .lead{color:#c8d6fb;max-width:52ch}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 0}
.hero-art{width:100%;color:#3b63c9}
.hero-facts{display:flex;gap:26px;flex-wrap:wrap;margin:34px 0 0;padding:0;list-style:none;color:#a9bbe6;font-size:.92rem}
.hero-facts b{display:block;font:700 1.7rem/1 var(--serif);color:#fff;margin-bottom:4px}
.grid-bg{background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(180deg,var(--night) 0%,var(--night-2) 100%);background-size:36px 36px,36px 36px,auto}

/* sections */
.section{padding:64px 0}
.section.tight{padding:40px 0}
.section.white{background:#fff;border-block:1px solid var(--line-2)}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:28px;flex-wrap:wrap}
.section-head h2{margin:0}
.section-head p{margin:.4rem 0 0;color:var(--muted);max-width:60ch}
.dark .section-head p{color:#a9bbe6}
.more{font-weight:600;white-space:nowrap}

/* cards */
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);position:relative}
.card .ph{aspect-ratio:3/2;background:var(--line-2);overflow:hidden}
.card .ph img{width:100%;height:100%;object-fit:cover}
.card .bd{padding:18px 18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{font-size:1.18rem;margin:0}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a::after{content:"";position:absolute;inset:0}
.card h3 a:hover{color:var(--cobalt)}
.card p{margin:0;color:var(--ink-2);font-size:.97rem;line-height:1.5}
.card .meta{font-size:.82rem;color:var(--muted);margin-top:auto;padding-top:6px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.card .badge{position:absolute;top:10px;left:10px;z-index:2;display:none}
.card.is-read .badge.read,.card.is-prog .badge.prog{display:inline-block}
.favbtn{position:relative;z-index:3}
.card .favbtn{position:absolute;top:10px;right:10px;background:#fff;border:1px solid var(--line);border-radius:99px;padding:.35rem .6rem;font:600 .78rem var(--sans);cursor:pointer;color:var(--ink)}
.card .favbtn[aria-pressed="true"]{background:var(--amber);border-color:var(--amber)}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:6px;box-shadow:var(--shadow);position:relative;border-top:4px solid var(--cobalt)}
.tile:nth-child(3n+2){border-top-color:var(--cyan)}
.tile:nth-child(3n){border-top-color:var(--amber)}
.tile:hover{border-color:var(--cobalt);color:var(--ink)}
.tile h3{margin:0;font-size:1.15rem}
.tile p{margin:0;color:var(--ink-2);font-size:.95rem;line-height:1.5}
.tile small{color:var(--muted);margin-top:auto;padding-top:8px;font-weight:600}
.trail-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:10px}
.trail-card h3{margin:0}
.trail-card h3 a{color:var(--ink);text-decoration:none}
.trail-card ol{margin:0;padding-left:1.1rem;color:var(--ink-2);font-size:.92rem;line-height:1.45}
.trail-card .meta{margin-top:auto;font-size:.85rem;color:var(--muted)}
.prog{height:6px;background:var(--line-2);border-radius:99px;overflow:hidden}
.prog i{display:block;height:100%;width:0;background:var(--cobalt)}

/* timeline strip (home) */
.strip{display:flex;gap:0;overflow-x:auto;padding:26px 4px 18px;scroll-snap-type:x proximity;border-top:2px solid var(--cobalt);margin-top:14px}
.strip li{list-style:none;flex:0 0 240px;padding:0 20px 0 0;scroll-snap-align:start;position:relative}
.strip li::before{content:"";position:absolute;top:-33px;left:0;width:12px;height:12px;border-radius:50%;background:var(--amber);border:2px solid var(--paper)}
.strip b{display:block;font:700 .95rem var(--sans);color:var(--cobalt-d)}
.strip h3{font-size:1.05rem;margin:.2rem 0 .3rem}
.strip p{font-size:.9rem;line-height:1.45;color:var(--ink-2);margin:0 0 .4rem}
.strip ul,.strip{margin-bottom:0}

/* timeline page */
.filters{display:flex;flex-wrap:wrap;gap:12px;align-items:end;background:#fff;border:1px solid var(--line);padding:16px;border-radius:var(--radius);margin:0 0 20px}
.filters label{display:flex;flex-direction:column;gap:4px;font:600 .8rem var(--sans);color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.filters select,.filters input[type=search],.field input,.field select,.field textarea{font:400 1rem var(--sans);padding:.6rem .75rem;border:1px solid #b9b5a4;border-radius:8px;background:#fff;color:var(--ink);min-width:200px}
.filters input[type=search]{min-width:240px}
.pchips{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.count{font-size:.95rem;color:var(--muted);margin:0 0 14px}
.tl{list-style:none;margin:0;padding:0 0 0 26px;border-left:3px solid var(--cobalt)}
.tl li{position:relative;padding:0 0 26px 22px}
.tl li::before{content:"";position:absolute;left:-36px;top:.35rem;width:16px;height:16px;border-radius:50%;background:var(--amber);border:3px solid var(--paper);box-shadow:0 0 0 2px var(--cobalt)}
.tl .when{font:700 .9rem var(--sans);color:var(--cobalt-d);display:block;margin-bottom:2px}
.tl h3{margin:0 0 .25rem}
.tl p{margin:0 0 .5rem;max-width:66ch}
.tl .tags{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.tl li[hidden],.card[hidden],.gloss-item[hidden]{display:none}
.tl .pdiv{font:700 .78rem var(--sans);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:10px 0 12px -48px;background:var(--paper);padding:2px 0}
.empty{background:#fff;border:1px dashed #b9b5a4;border-radius:var(--radius);padding:24px;text-align:center;color:var(--muted)}

/* diagram */
.diagram-wrap{overflow-x:auto;background:rgba(255,255,255,.04);border:1px solid #27407f;border-radius:var(--radius);padding:10px}
.diagram-wrap.light{background:#fff;border-color:var(--line)}
.diagram{min-width:760px;display:block}
.diagram-wrap.compact .diagram{min-width:560px}
.dg-col{fill:rgba(255,255,255,.03)}
.dg-col.alt{fill:rgba(255,255,255,.07)}
.dg-ph{font:600 11px var(--sans);fill:#a9bbe6;letter-spacing:.04em}
.dg-lab{font:500 12px var(--sans);fill:#b8c8f0}
.dg-lane{stroke:#27407f;stroke-width:1;stroke-dasharray:2 5}
.dg-edge{stroke:#5b82e6;stroke-width:1.3;opacity:.6}
.dg-edge.on{stroke:var(--amber);stroke-width:2;opacity:1}
.dg-node circle{fill:var(--cyan-l);stroke:var(--night);stroke-width:2}
.dg-node.hi circle{fill:var(--amber)}
.dg-node:hover circle,.dg-node:focus circle{fill:#fff}
.dg-nt{font:500 11.5px var(--sans);fill:#e7eeff}
.light .dg-col{fill:rgba(15,23,42,.02)}.light .dg-col.alt{fill:rgba(15,23,42,.05)}
.light .dg-ph{fill:var(--muted)}.light .dg-lab{fill:var(--ink-2)}.light .dg-lane{stroke:var(--line)}
.light .dg-edge{stroke:#7e9be6}.light .dg-node circle{fill:var(--cobalt);stroke:#fff}.light .dg-node.hi circle{fill:var(--amber);stroke:var(--ink)}.light .dg-nt{fill:var(--ink)}
.diagram-list{columns:2;gap:30px;font-size:.92rem;color:#c8d6fb;padding-left:1.1rem;margin:16px 0 0}
.diagram-list li{break-inside:avoid;margin-bottom:.3rem}

/* page headers */
.page-head{background:#fff;border-bottom:1px solid var(--line);padding:38px 0 34px}
.page-head.dark{background:var(--night-2);border:0}
.page-head h1{margin-bottom:.3em}
.page-head .lead{max-width:62ch;margin:0}
.crumbs{font-size:.88rem;padding:14px 20px 14px;color:var(--muted)}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px 8px}
.crumbs li+li::before{content:"/";margin-right:8px;color:#9aa4b8}
.crumbs a{color:var(--muted)}
.crumbs [aria-current]{color:var(--ink);font-weight:600}

/* article */
.art-head{background:#fff;border-bottom:1px solid var(--line)}
.art-head .wrap{padding-top:10px;padding-bottom:34px}
.art-head h1{max-width:24ch;font-size:clamp(2rem,4.2vw,3rem)}
.art-head .sum{font:400 1.25rem/1.5 var(--serif);color:var(--ink-2);max-width:60ch;margin:0 0 16px}
.byline{font-size:.9rem;color:var(--muted);display:flex;gap:6px 16px;flex-wrap:wrap;align-items:center}
.byline span+span::before{content:"·";margin-right:16px;color:#9aa4b8}
.art-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.art-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:48px;padding:40px 20px 30px;max-width:var(--w);margin:0 auto}
.toc{position:sticky;top:84px;align-self:start;font-size:.92rem}
.toc h2{font:700 .75rem var(--sans);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 10px}
.toc ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.toc a{display:block;padding:.35rem 0 .35rem 14px;margin-left:-2px;border-left:2px solid transparent;color:var(--ink-2);text-decoration:none;line-height:1.35}
.toc a:hover,.toc a.active{color:var(--cobalt);border-left-color:var(--cobalt)}
figure.feat{margin:0 0 28px}
figure.feat img{width:100%;border-radius:var(--radius);background:var(--line-2);aspect-ratio:3/2;object-fit:cover}
figcaption{font-size:.86rem;color:var(--muted);margin-top:8px;line-height:1.45}
.prose{font:400 1.14rem/1.75 var(--serif);max-width:700px}
.prose h2{margin-top:2em;font-size:1.65rem}
.prose h3{margin-top:1.6em}
.prose p,.prose ul{margin-bottom:1.15em}
.prose ul{padding-left:1.3rem}
.prose li{margin-bottom:.35em}
.prose a{font-weight:600}
.box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin:34px 0;max-width:700px}
.box h2{font-size:1.3rem;margin:0 0 .7em}
.tline{list-style:none;margin:0;padding:0 0 0 20px;border-left:3px solid var(--cobalt)}
.tline li{position:relative;padding:0 0 14px 16px;font-size:.98rem;line-height:1.5}
.tline li::before{content:"";position:absolute;left:-28px;top:.45rem;width:11px;height:11px;border-radius:50%;background:var(--amber);border:2px solid #fff;box-shadow:0 0 0 2px var(--cobalt)}
.tline b{color:var(--cobalt-d);margin-right:6px}
.sources ul{margin:0;padding-left:1.2rem;font-size:.95rem}
.sources li{margin-bottom:.55rem;line-height:1.45}
.sources a,.doc a,.doc li{overflow-wrap:anywhere}
.art-layout>div,.doc{min-width:0}
.terms{display:flex;flex-wrap:wrap;gap:8px}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:10px 0 0}
.pager a{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;text-decoration:none;color:var(--ink)}
.pager a:hover{border-color:var(--cobalt)}
.pager small{display:block;color:var(--muted);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:2px}
.pager .next{text-align:right}
.pager .ghosted{visibility:hidden}
.trail-block{margin:28px 0;max-width:700px}
.trail-block h3{font:700 1rem var(--sans);margin-bottom:10px}
.readbar{position:fixed;left:0;top:0;height:4px;width:0;background:linear-gradient(90deg,var(--cyan-l),var(--amber));z-index:200;transition:width .1s linear}
.notice{font-size:.88rem;color:var(--muted);border-left:3px solid var(--amber);padding:6px 12px;background:var(--amber-l);border-radius:0 6px 6px 0;max-width:700px}

/* ordered trail list */
.steps{list-style:none;padding:0;margin:0;counter-reset:s;display:grid;gap:16px}
.steps li{counter-increment:s;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 18px 18px 70px;position:relative;box-shadow:var(--shadow)}
.steps li::before{content:counter(s);position:absolute;left:18px;top:16px;width:38px;height:38px;border-radius:50%;background:var(--cobalt);color:#fff;font:700 1.1rem/38px var(--serif);text-align:center}
.steps h3{margin:0 0 .3rem}
.steps h3 a{color:var(--ink);text-decoration:none}
.steps p{margin:0 0 .4rem;color:var(--ink-2);font-size:.97rem}
.steps li.is-read::before{background:#15803d;content:"✓"}

/* glossary */
.gloss{display:grid;gap:14px}
.gloss-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.gloss-item h3{margin:0 0 .25rem;font-size:1.15rem}
.gloss-item p{margin:0 0 .5rem;color:var(--ink-2)}
.az{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 18px}
.az a{min-width:34px;text-align:center;padding:.35rem .5rem;border:1px solid var(--line);border-radius:6px;background:#fff;text-decoration:none;font-weight:600}

/* prose pages */
.doc{max-width:760px;margin:0 auto;padding:44px 20px 70px}
.doc h2{margin-top:1.8em;font-size:1.5rem}
.doc h3{margin-top:1.4em}
.doc ul,.doc ol{padding-left:1.3rem}
.doc li{margin-bottom:.4em}
.doc .lead{margin-bottom:1.4em}
.doc table,.table{width:100%;border-collapse:collapse;font-size:.93rem;margin:1em 0 1.6em;background:#fff}
.doc th,.doc td,.table th,.table td{border:1px solid var(--line);padding:.6rem .7rem;text-align:left;vertical-align:top}
.doc th,.table th{background:var(--cobalt-l);color:var(--cobalt-d)}
.tablewrap{overflow-x:auto}

/* forms */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.field label{font-weight:600}
.field input,.field select,.field textarea{width:100%}
.field textarea{min-height:170px;resize:vertical}
.hint{font-size:.88rem;color:var(--muted)}
.status{margin-top:14px;padding:12px 14px;border-radius:8px;background:#e0f2fe;color:#0c4a6e;display:none}
.status.show{display:block}

/* footer */
.site-footer{background:var(--night);color:#c7d4f5;padding:54px 0 30px;margin-top:0;font-size:.95rem}
.site-footer a{color:#c7d4f5;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:34px}
.site-footer h2{font:700 .78rem var(--sans);letter-spacing:.14em;text-transform:uppercase;color:#fff;margin:0 0 12px}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:7px}
.site-footer .brand{margin-bottom:12px}
.legal{border-top:1px solid #1e3a78;margin-top:34px;padding-top:20px;font-size:.85rem;color:#9db4ef}
.legal p{margin:0 0 .5rem;max-width:90ch}
.legal a{text-decoration:underline}

/* slot placeholders (kept empty and hidden) */
.slot[hidden]{display:none}

@media (max-width:980px){
  .g3{grid-template-columns:repeat(2,1fr)}.g4{grid-template-columns:repeat(2,1fr)}
  .hero .wrap{grid-template-columns:1fr}.hero-art{max-width:460px}
  .art-layout{grid-template-columns:minmax(0,1fr);gap:10px}.toc{position:static;border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;background:#fff}
  .fgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .hsearch{flex:1 1 auto;order:3;min-width:0}
  .site-header .wrap{flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
  .nav{display:none;order:4;flex-basis:100%;flex-direction:column;align-items:stretch;margin:0}
  .nav.open{display:flex}
  .nav a{padding:.8rem .7rem}
}
@media (max-width:640px){
  body{font-size:1rem}
  .g3,.g2,.g4{grid-template-columns:1fr}
  .hero{padding:48px 0 56px}.section{padding:46px 0}
  .fgrid{grid-template-columns:1fr}
  .pager{grid-template-columns:1fr}.diagram-list{columns:1}
  .strip li{flex-basis:210px}
  .filters label,.filters select,.filters input[type=search]{width:100%;min-width:0}
  .steps li{padding-left:62px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.readbar{transition:none}}
@media print{.site-header,.site-footer,.toc,.art-actions,.readbar,.pager,.hsearch{display:none}body{background:#fff}.prose{font-size:11pt}}