/* fonts served from this origin — the site makes no external requests */
@font-face{font-family:"Bricolage Grotesque";font-style:normal;font-weight:200 800;font-display:swap;
  src:url(fonts/bricolage.woff2) format("woff2-variations")}
@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:swap;
  src:url(fonts/source-serif.woff2) format("woff2-variations")}
@font-face{font-family:"Source Serif 4";font-style:italic;font-weight:200 900;font-display:swap;
  src:url(fonts/source-serif-it.woff2) format("woff2-variations")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;
  src:url(fonts/plex-mono-400.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;
  src:url(fonts/plex-mono-500.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:600;font-display:swap;
  src:url(fonts/plex-mono-600.woff2) format("woff2")}

:root{
  --paper:#EEF1F3;
  --surface:#FFFFFF;
  --surface-2:#E3E8EB;
  --ink:#10151C;
  --ink-2:#39444F;
  --ink-3:#69757F;
  --rule:#C9D2D8;
  --rule-soft:#DCE3E7;
  --accent:#C2481A;
  --accent-soft:#F2DCD3;
  --cyan:#1F6F8B;
  --cyan-soft:#D6E7EC;
  --warn:#8A5A00;
  --shadow:rgba(16,21,28,.10);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0D1218;
    --surface:#141B23;
    --surface-2:#1B242E;
    --ink:#E6EDF2;
    --ink-2:#B2C0CC;
    --ink-3:#7E8D9A;
    --rule:#2A3742;
    --rule-soft:#1F2A34;
    --accent:#FF7A47;
    --accent-soft:#3A2016;
    --cyan:#63B9D4;
    --cyan-soft:#12303A;
    --warn:#E0A83C;
    --shadow:rgba(0,0,0,.45);
  }
}
:root[data-theme="dark"]{
  --paper:#0D1218;
  --surface:#141B23;
  --surface-2:#1B242E;
  --ink:#E6EDF2;
  --ink-2:#B2C0CC;
  --ink-3:#7E8D9A;
  --rule:#2A3742;
  --rule-soft:#1F2A34;
  --accent:#FF7A47;
  --accent-soft:#3A2016;
  --cyan:#63B9D4;
  --cyan-soft:#12303A;
  --warn:#E0A83C;
  --shadow:rgba(0,0,0,.45);
}

*{box-sizing:border-box}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Source Serif 4",Georgia,"Times New Roman",serif;
  font-size:17px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.disp{font-family:"Bricolage Grotesque","Helvetica Neue",Arial,sans-serif;text-wrap:balance}
code,.mono,table,.fig-label,.eyebrow,.num{font-family:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace}

.wrap{max-width:1180px;margin:0 auto;padding-inline:20px;padding-block:0}
.col{max-width:66ch}

/* ---------- cover ---------- */
.cover{
  border-bottom:1px solid var(--rule);
  padding-block:clamp(40px,7vw,86px) clamp(32px,5vw,60px);
}
.cover .eyebrow{
  font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin:0 0 20px;
}
.cover h1{
  font-size:clamp(42px,9vw,92px);line-height:.95;letter-spacing:-.025em;
  font-weight:800;margin:0 0 22px;
}
.cover .sub{
  font-size:clamp(17px,2.2vw,22px);line-height:1.45;color:var(--ink-2);
  max-width:34ch;margin:0 0 30px;
}
.spec{
  display:flex;flex-wrap:wrap;gap:0;border-top:1px solid var(--rule);
  font-family:"IBM Plex Mono",monospace;font-size:12px;
}
.spec div{
  padding:12px 22px 12px 0;margin-right:22px;border-right:1px solid var(--rule-soft);
}
.spec div:last-child{border-right:0}
.spec b{display:block;color:var(--ink-3);font-weight:500;font-size:10px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:3px}

/* ---------- layout ---------- */
.book{display:grid;grid-template-columns:minmax(0,1fr);gap:0}
.book > *{min-width:0}
@media (min-width:1000px){
  .book{grid-template-columns:232px minmax(0,1fr);gap:56px;align-items:start}
  .toc-rail{position:sticky;top:calc(env(safe-area-inset-top,0px) + 24px);max-height:88vh;overflow-y:auto;padding-block:40px 40px}
}
.toc-rail{padding-block:28px}
.toc-rail h4{
  font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);
  margin:0 0 12px;font-weight:600;
}
.toc-rail ol{list-style:none;margin:0 0 22px;padding:0;font-family:"IBM Plex Mono",monospace;font-size:12.5px;line-height:1.5}
.toc-rail li{margin-bottom:7px;display:flex;gap:9px}
.toc-rail a{color:var(--ink-2);text-decoration:none;border-bottom:1px solid transparent}
.toc-rail a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.toc-rail .n{color:var(--ink-3);min-width:1.6em}
.toc-rail .part{color:var(--accent);font-size:10px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 8px;font-weight:600}

main{padding-block:28px 72px}

/* ---------- parts & chapters ---------- */
.part-open{
  margin:68px 0 34px;padding-top:26px;border-top:2px solid var(--ink);
  display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;
}
.part-open .pn{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--accent);letter-spacing:.12em;text-transform:uppercase;font-weight:600}
.part-open h2{font-size:clamp(26px,4vw,38px);margin:0;letter-spacing:-.02em;font-weight:800;line-height:1.05}
.part-open .pd{flex-basis:100%;color:var(--ink-3);font-size:15px;margin-top:2px;max-width:60ch}

.ch{margin:0 0 58px;scroll-margin-top:24px}
.ch-head{margin:46px 0 20px}
.ch-head .num{font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);display:block;margin-bottom:9px}
.ch-head h3{font-size:clamp(24px,3.6vw,33px);line-height:1.1;letter-spacing:-.02em;margin:0;font-weight:800}

h4{font-size:15px;letter-spacing:.01em;margin:32px 0 10px;font-weight:600;color:var(--ink)}
p{margin:0 0 15px;max-width:66ch}
strong{font-weight:600}
a{color:var(--accent)}

ul,ol{max-width:66ch;padding-left:1.15em;margin:0 0 15px}
li{margin-bottom:7px}

/* ---------- pull elements ---------- */
.lede{font-size:19px;line-height:1.5;color:var(--ink-2);max-width:60ch;margin-bottom:22px}

blockquote{
  margin:20px 0;padding:14px 0 14px 20px;border-left:3px solid var(--accent);
  max-width:64ch;font-size:16.5px;color:var(--ink);
}
blockquote p{margin-bottom:8px}
blockquote p:last-child{margin-bottom:0}
blockquote cite{display:block;font-style:normal;font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--ink-3);margin-top:8px}

.callout{
  border:1px solid var(--rule);background:var(--surface);border-radius:2px;
  padding:18px 20px;margin:24px 0;max-width:66ch;
}
.callout.warn{border-left:3px solid var(--accent);background:var(--accent-soft)}
.callout.warn p{color:var(--ink)}
.callout .k{
  font-family:"IBM Plex Mono",monospace;font-size:10px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent);display:block;margin-bottom:8px;font-weight:600;
}
.callout p:last-child{margin-bottom:0}

.keyfact{
  display:flex;gap:18px;align-items:baseline;margin:22px 0;padding:16px 0;
  border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);max-width:66ch;
}
.keyfact .big{
  font-family:"Bricolage Grotesque",sans-serif;font-size:42px;font-weight:800;
  line-height:1;color:var(--accent);letter-spacing:-.03em;white-space:nowrap;
}
.keyfact .t{font-size:15px;color:var(--ink-2);line-height:1.4}

/* ---------- tables ---------- */
.tw{overflow-x:auto;margin:22px 0;border:1px solid var(--rule);border-radius:2px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:13px;font-variant-numeric:tabular-nums}
th,td{padding:9px 13px;text-align:left;border-bottom:1px solid var(--rule-soft);vertical-align:top}
th{
  background:var(--surface-2);font-weight:600;font-size:10.5px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--ink-2);white-space:nowrap;
}
tbody tr:last-child td{border-bottom:0}
td strong{color:var(--ink);font-weight:600}
.hl td{background:var(--accent-soft)}

/* ---------- figures ---------- */
figure{margin:32px 0;max-width:100%}
figure svg{display:block;width:100%;max-width:100%;height:auto;color:var(--ink)}
figcaption{
  font-family:"IBM Plex Mono",monospace;font-size:11.5px;line-height:1.5;color:var(--ink-3);
  margin-top:12px;padding-top:9px;border-top:1px solid var(--rule-soft);max-width:70ch;
}
figcaption b{color:var(--ink-2);font-weight:600}
.fig-frame{border:1px solid var(--rule);background:var(--surface);padding:22px 20px;border-radius:2px}
@media (min-width:1000px){.fig-wide{width:min(100%,900px)}}

/* ---------- misc ---------- */
.gaps{border:1px dashed var(--rule);padding:18px 20px;margin:26px 0;max-width:66ch;background:transparent}
.gaps .k{font-family:"IBM Plex Mono",monospace;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);display:block;margin-bottom:8px;font-weight:600}
.src p{font-size:13.5px;color:var(--ink-2);max-width:72ch}
.endnote{margin-top:64px;padding-top:24px;border-top:2px solid var(--ink);font-size:13px;color:var(--ink-3);max-width:70ch}

@media (prefers-reduced-motion:no-preference){a{transition:color .15s,border-color .15s}}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- site chrome (shared across the two books) ---------- */
.sitebar{
  border-bottom:1px solid var(--rule); background:var(--surface);
  position:sticky; top:0; z-index:40;
}
.sitebar .in{
  max-width:1180px; margin:0 auto; padding:10px 20px;
  display:flex; align-items:center; gap:18px; flex-wrap:wrap;
  font-family:"IBM Plex Mono",monospace; font-size:11px;
  letter-spacing:.1em; text-transform:uppercase;
}
.sitebar a{ color:var(--ink-3); text-decoration:none; border-bottom:1px solid transparent; }
.sitebar a:hover{ color:var(--accent); border-bottom-color:var(--accent); }
.sitebar .home{ color:var(--ink); font-weight:600; letter-spacing:.14em; }
.sitebar .sep{ margin-left:auto; }
.sitebar a[aria-current="page"]{ color:var(--accent); }

.themer{
  display:inline-flex; align-items:center; gap:6px; cursor:pointer;
  font:inherit; letter-spacing:inherit; text-transform:inherit;
  color:var(--ink-3); background:none; border:0; padding:0; line-height:1;
}
.themer:hover{ color:var(--accent); }
.themer svg{ width:12px; height:12px; display:block; }

/* ---------- display formula ---------- */
.formula{
  margin:26px 0; padding:18px 20px; max-width:66ch;
  border-left:3px solid var(--accent); background:var(--surface);
  font-family:"IBM Plex Mono",monospace; font-size:21px; letter-spacing:.03em;
  display:flex; align-items:baseline; gap:.42em; color:var(--ink);
}
.formula .op{ opacity:.55; }
.formula sup{ font-size:.58em; vertical-align:super; }


.sitebar .offline{
  font-size:9.5px; letter-spacing:.12em; color:var(--accent);
  border:1px solid var(--accent); border-radius:2px; padding:2px 6px; margin-left:-10px;
}
.dl{
  border:1px solid var(--rule); border-radius:2px; background:var(--surface);
  padding:22px 24px; margin:34px 0 0;
}
.dl h4{ margin:0 0 6px; font-size:15px; }
.dl p{ font-size:14.5px; color:var(--ink-2); margin:0 0 16px; max-width:60ch; }
.dl ul{ list-style:none; margin:0; padding:0; max-width:none; }
.dl li{ margin:0; border-top:1px solid var(--rule-soft); }
.dl li a{
  display:flex; align-items:baseline; gap:12px; flex-wrap:wrap;
  padding:11px 0; text-decoration:none; color:var(--ink);
  font-family:"IBM Plex Mono",monospace; font-size:12.5px;
}
.dl li a:hover{ color:var(--accent); }
.dl li a .sz{ color:var(--ink-3); font-size:11px; margin-left:auto; }
.dl li a .arr{ color:var(--accent); }

/* ---------- landing ---------- */
.shelf{ display:grid; gap:20px; margin:34px 0 0; grid-template-columns:repeat(auto-fit,minmax(272px,1fr)); }
@media (min-width:820px){ .shelf{ gap:24px; } }
.vol{
  display:block; text-decoration:none; color:inherit;
  border:1px solid var(--rule); background:var(--surface); border-radius:2px;
  padding:26px 24px 24px; transition:border-color .15s, transform .15s;
}
.vol:hover{ border-color:var(--accent); transform:translateY(-2px); }
.vol .vn{
  font-family:"IBM Plex Mono",monospace; font-size:10px; letter-spacing:.16em;
  text-transform:uppercase; color:var(--accent); font-weight:600; display:block; margin-bottom:12px;
}
.vol h3{ font-size:clamp(23px,3vw,30px); line-height:1.1; letter-spacing:-.02em; margin:0 0 12px; font-weight:800; }
.vol p{ margin:0 0 14px; font-size:15.5px; color:var(--ink-2); max-width:46ch; }
.vol .meta{
  font-family:"IBM Plex Mono",monospace; font-size:11px; color:var(--ink-3);
  border-top:1px solid var(--rule-soft); padding-top:11px; margin-top:16px;
}
.vol .go{ font-family:"IBM Plex Mono",monospace; font-size:11px; color:var(--accent); letter-spacing:.08em; text-transform:uppercase; font-weight:600; }
.sitefoot{ margin-top:64px; padding:24px 0 72px; border-top:2px solid var(--ink); font-size:13px; color:var(--ink-3); max-width:70ch; }


@media print{
@page{ size:A4; margin:16mm 15mm 17mm 15mm; }
html,body{ background:#fff !important; }
html{ -webkit-print-color-adjust:exact; print-color-adjust:exact; }
body{ font-size:10.3pt; line-height:1.54; }
.sitebar,.themer{ display:none !important; }
.wrap{ max-width:none; padding-inline:0; }
.book{ display:block !important; grid-template-columns:none !important; gap:0 !important; }
main{ padding-block:0; }
a{ text-decoration:none; color:var(--ink) !important; }
.cover{ padding:52mm 0 0; border-bottom:0; min-height:247mm; display:flex; flex-direction:column; }
.cover h1{ font-size:56pt; line-height:.92; margin-bottom:10mm; letter-spacing:-.03em; }
.cover .sub{ font-size:13.5pt; line-height:1.4; max-width:38ch; margin-bottom:auto; }
.cover .eyebrow{ font-size:9pt; margin-bottom:8mm; }
.cover .spec{ font-size:8.4pt; margin-bottom:6mm; border-top:1px solid var(--rule); padding-top:2mm; }
.cover .spec div{ padding:3mm 5mm 3mm 0; margin-right:5mm; }
.cover .spec b{ font-size:7pt; }
.toc-rail{ position:static !important; max-height:none !important; overflow:visible !important;
  padding-block:0 !important; break-before:page; break-after:page; }
.toc-rail h4{ font-size:8pt; margin-bottom:6mm; }
.toc-rail ol{ font-size:9.6pt; line-height:1.45; margin-bottom:7mm; }
.toc-rail li{ margin-bottom:2.4mm; }
.toc-rail .part{ font-size:8pt; margin-bottom:3mm; }
.part-open{ break-before:page; break-after:avoid; margin:0 0 9mm; border-top:2px solid var(--ink); padding-top:5mm; }
.part-open h2{ font-size:24pt; }
.part-open .pd{ font-size:10pt; }
.ch{ break-before:page; margin:0; }
.part-open + .ch{ break-before:avoid; }
.ch-head{ margin:0 0 6mm; break-after:avoid; }
.ch-head h3{ font-size:19pt; line-height:1.12; }
.ch-head .num{ font-size:8.4pt; margin-bottom:2.5mm; }
h4{ font-size:11pt; margin:7mm 0 2.5mm; break-after:avoid; }
p{ orphans:3; widows:3; max-width:none; }
ul,ol{ max-width:none; }
.lede{ font-size:12pt; max-width:none; margin-bottom:6mm; }
figure,.callout,.keyfact,blockquote,.gaps,.tw,.formula{ break-inside:avoid; max-width:none; }
figure{ margin:8mm 0; }
.fig-frame{ padding:6mm 5mm; }
figcaption{ font-size:8.6pt; margin-top:3mm; padding-top:2.5mm; max-width:none; }
.callout{ padding:4.5mm 5mm; margin:6mm 0; }
.callout .k{ font-size:7.6pt; }
.keyfact{ margin:6mm 0; padding:4mm 0; }
.keyfact .big{ font-size:28pt; }
.keyfact .t{ font-size:10pt; }
.formula{ font-size:14pt; padding:4mm 5mm; margin:6mm 0; }
blockquote{ margin:6mm 0; padding:3mm 0 3mm 5mm; font-size:10.4pt; max-width:none; }
blockquote cite{ font-size:8.4pt; }
.tw{ overflow:visible; margin:6mm 0; }
table{ font-size:8.4pt; }
th,td{ padding:2mm 3mm; }
th{ font-size:7.6pt; }
thead{ display:table-header-group; }
tr{ break-inside:avoid; }
.src p{ font-size:9.4pt; max-width:none; }
.gaps{ padding:4.5mm 5mm; margin:6mm 0; }
.endnote{ margin-top:10mm; padding-top:5mm; font-size:9.4pt; max-width:none; break-inside:avoid; }
}