:root {
  --ink: #17231d;
  --ink-soft: #405148;
  --paper: #f4f0e6;
  --paper-deep: #e8e1d3;
  --white: #fffdf8;
  --moss: #2e674c;
  --moss-dark: #183f2d;
  --sage: #9db2a3;
  --copper: #b85f3d;
  --amber: #d8a444;
  --rule: #bdc6bd;
  --code: #10231a;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --measure: 74ch;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(46, 103, 76, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 103, 76, .055) 1px, transparent 1px),
    var(--paper);
  background-size: 24px 24px;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

a { color: var(--moss-dark); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--copper); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; }

img { display: block; max-width: 100%; height: auto; }

.utility {
  background: var(--ink);
  color: #dce5de;
  border-bottom: 3px solid var(--copper);
  font: .72rem/1.3 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.utility-inner, .nav-inner, .footer-inner {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.utility-inner { display: flex; justify-content: space-between; gap: 20px; padding: 9px 0; }
.utility span:last-child { color: var(--sage); }

.site-nav {
  position: sticky;
  z-index: 20;
  top: 0;
  background: rgba(244, 240, 230, .96);
  border-bottom: 1px solid var(--ink);
  backdrop-filter: blur(10px);
}

.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 72px; }
.mast { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.mast::before { content: "//"; color: var(--copper); font: 700 1rem var(--mono); }
.mast span { max-width: 19rem; font: 700 .78rem/1.25 var(--mono); letter-spacing: .08em; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 18px; margin: 0; padding: 0; list-style: none; font: 600 .74rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: .055em; }
.nav-links a { color: var(--ink); text-decoration: none; border-bottom: 2px solid transparent; padding: 10px 0 8px; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--moss); border-color: var(--copper); }

.page-head {
  border-bottom: 1px solid var(--ink);
  background: var(--white);
}

.page-head-inner {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 72px;
  padding: 70px 0 62px;
}

.eyebrow { margin: 0 0 14px; color: var(--copper); font: 700 .75rem/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.page-head h1, article > h1 { margin: 0; max-width: 18ch; font-size: clamp(2.45rem, 6vw, 5.5rem); line-height: .98; letter-spacing: -.055em; font-weight: 760; }
.head-summary { align-self: end; border-top: 5px solid var(--moss); padding-top: 16px; color: var(--ink-soft); font-size: .98rem; line-height: 1.55; }
.head-summary strong { display: block; margin-bottom: 7px; color: var(--ink); font: 700 .7rem var(--mono); letter-spacing: .1em; text-transform: uppercase; }

.article-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 200px minmax(0, 780px);
  gap: 58px;
  justify-content: start;
  padding: 58px 0 90px;
}

.article-rail { position: relative; min-width: 0; font-family: var(--mono); }
.rail-sticky { position: sticky; top: 104px; }
.rail-label { display: block; color: var(--copper); font-size: .68rem; letter-spacing: .11em; text-transform: uppercase; }
.rail-meta { margin: 9px 0 26px; color: var(--ink-soft); font-size: .74rem; line-height: 1.6; }
.toc { margin: 0; padding: 18px 0 0; border-top: 1px solid var(--ink); list-style: none; }
.toc li + li { margin-top: 10px; }
.toc a { color: var(--ink-soft); font-size: .72rem; line-height: 1.35; text-decoration: none; }
.toc a:hover { color: var(--copper); }

article { min-width: 0; }
article > h1 { display: none; }
article h2 { scroll-margin-top: 105px; margin: 3.2rem 0 1rem; padding-top: .9rem; border-top: 1px solid var(--rule); font-size: clamp(1.55rem, 3vw, 2.15rem); line-height: 1.15; letter-spacing: -.025em; }
article h3 { margin: 2rem 0 .6rem; font-size: 1.17rem; line-height: 1.3; }
article p, article ul, article ol, article dl, article table, article pre { max-width: var(--measure); }
article p { margin: 0 0 1.25rem; }
article ul, article ol { margin: 0 0 1.5rem; padding-left: 1.35rem; }
article li + li { margin-top: .45rem; }
.lede { margin-top: 0; color: var(--ink-soft); font-size: clamp(1.18rem, 2vw, 1.38rem); line-height: 1.6; }

.hero-figure { margin: 0 0 2.7rem; border: 1px solid var(--ink); background: var(--ink); box-shadow: 12px 12px 0 var(--paper-deep); }
.hero-figure img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }

.notice {
  margin: 2rem 0 2.5rem;
  padding: 20px 22px 18px;
  border: 1px solid var(--ink);
  border-left: 7px solid var(--copper);
  background: #fff8ec;
  box-shadow: 7px 7px 0 rgba(23, 35, 29, .1);
}
.notice > strong { display: block; margin-bottom: 8px; color: var(--copper); font: 700 .72rem var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.notice p { margin: 0; }
.critical-opening { padding-left: 20px; border-left: 7px solid var(--copper); }

.index-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 2rem 0; border: 1px solid var(--ink); background: var(--ink); }
.index-grid section { padding: 20px; background: var(--white); }
.index-grid h3 { margin-top: 0; font: 700 .82rem var(--mono); text-transform: uppercase; letter-spacing: .04em; }
.index-grid p { margin-bottom: 0; font-size: .94rem; }

pre { position: relative; overflow-x: auto; padding: 20px 22px; border-left: 6px solid var(--copper); background: var(--code); color: #e9f1eb; font: .84rem/1.65 var(--mono); tab-size: 2; }
code { font-family: var(--mono); }
p code, li code { padding: .12em .32em; border: 1px solid #cbd0ca; background: var(--white); font-size: .88em; }
.copy-code { position: absolute; top: 8px; right: 8px; padding: 5px 8px; border: 1px solid #6e8275; background: #1d382b; color: #fff; font: .65rem var(--mono); cursor: pointer; }

table { width: 100%; border-collapse: collapse; margin: 1.8rem 0; background: var(--white); font-size: .91rem; }
th, td { padding: 12px 13px; border: 1px solid #aeb9b1; text-align: left; vertical-align: top; }
th { background: var(--moss-dark); color: #fff; font: 700 .72rem/1.4 var(--mono); letter-spacing: .03em; text-transform: uppercase; }

.taxonomy { margin: 1.8rem 0; border-top: 1px solid var(--ink); }
.taxonomy div { display: grid; grid-template-columns: 190px 1fr; border-bottom: 1px solid var(--rule); padding: 12px 0; }
.taxonomy dt { font: 700 .8rem/1.5 var(--mono); }
.taxonomy dd { margin: 0; color: var(--ink-soft); }

.next-read { margin-top: 4rem; padding: 24px; border: 1px solid var(--ink); background: var(--paper-deep); }
.next-read span { display: block; margin-bottom: 6px; color: var(--copper); font: 700 .7rem var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.next-read a { font-size: 1.25rem; font-weight: 700; }

.site-footer { background: var(--ink); color: #e6ece8; border-top: 7px solid var(--copper); }
.footer-inner { display: grid; grid-template-columns: 230px 1fr; gap: 58px; padding: 50px 0; }
.footer-title { color: var(--amber); font: 700 .76rem/1.5 var(--mono); text-transform: uppercase; letter-spacing: .09em; }
.footer-copy p { max-width: 78ch; margin: 0 0 15px; font-size: .86rem; line-height: 1.65; }
.footer-copy a { color: #f6d18b; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 18px; margin: 20px 0 0; padding: 0; list-style: none; font: .7rem var(--mono); text-transform: uppercase; }
.footer-links a { color: #c6d4ca; }
.copyright { color: var(--sage); }

.error-main { min-height: 58vh; }
.error-code { margin: 0; color: var(--copper); font: 700 clamp(5rem, 18vw, 12rem)/.8 var(--mono); letter-spacing: -.09em; }
.error-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.button-link { display: inline-block; padding: 10px 15px; border: 1px solid var(--ink); background: var(--moss-dark); color: #fff; font: 700 .75rem var(--mono); text-decoration: none; text-transform: uppercase; }
.button-link:hover { background: var(--copper); color: #fff; }

@media (max-width: 900px) {
  .site-nav { position: static; }
  .nav-inner { align-items: flex-start; flex-direction: column; padding: 18px 0; gap: 10px; }
  .nav-links { width: 100%; overflow-x: auto; padding-bottom: 5px; }
  .page-head-inner { grid-template-columns: 1fr; gap: 30px; padding: 52px 0 44px; }
  .head-summary { max-width: 44ch; }
  .article-shell { grid-template-columns: 1fr; gap: 0; }
  .article-rail { display: none; }
  .index-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 22px; }
}

@media (max-width: 620px) {
  body { font-size: 1rem; background-size: 20px 20px; }
  .utility-inner, .nav-inner, .page-head-inner, .article-shell, .footer-inner { width: min(100% - 28px, 1180px); }
  .utility-inner { display: block; }
  .utility span:last-child { display: none; }
  .nav-links { gap: 15px; }
  .page-head h1 { font-size: clamp(2.35rem, 13vw, 3.6rem); }
  .article-shell { padding-top: 36px; }
  .hero-figure { margin-inline: 0; box-shadow: 7px 7px 0 var(--paper-deep); }
  .taxonomy div { grid-template-columns: 1fr; gap: 5px; }
  table { display: block; overflow-x: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}