:root {
  color-scheme: light dark;
  --ink: #171717;
  --muted: #666;
  --line: #d8d8d8;
  --quiet: #f5f5f3;
  --paper: #fff;
  --secondary: #3f3f3f;
  --signal: #2457ff;
  --signal-ink: #fff;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
}

.signal-blue { --signal: #2457ff; --signal-ink: #fff; }
.signal-orange { --signal: #ff5a36; --signal-ink: #111; }
.signal-acid { --signal: #d8ff45; --signal-ink: #111; }
.signal-violet { --signal: #8a62ff; --signal-ink: #fff; }
.signal-green { --signal: #2dd79b; --signal-ink: #111; }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #efefec;
    --muted: #aaa;
    --line: #3b3b3b;
    --quiet: #242424;
    --paper: #151515;
    --secondary: #c7c7c3;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); line-height: 1.55; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid currentColor; outline-offset: 4px; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: .75rem;
  left: .75rem;
  padding: .5rem .65rem;
  background: var(--paper);
  border: 1px solid var(--ink);
  transform: translateY(-180%);
}
.skip-link:focus { transform: none; }

.reading-progress {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  pointer-events: none;
}
.document-page .reading-progress::after {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--signal);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  animation: reading-progress linear;
  animation-timeline: scroll(root);
}

.site-header,
.site-footer {
  display: grid;
  grid-template-columns: minmax(10rem, .75fr) 1fr auto;
  gap: 2rem;
  align-items: baseline;
  padding: 1rem max(1.25rem, calc((100vw - 104rem) / 2));
  border-bottom: 1px solid var(--line);
  font-size: .78rem;
}
.site-header .wordmark { font-size: 1rem; font-weight: 700; text-decoration: none; }
.site-header > span { color: var(--muted); }
.site-header nav { display: flex; gap: 1rem; }

.home,
.reader-layout,
.not-found {
  width: min(100% - 2.5rem, 104rem);
  margin: 0 auto;
}

.home-intro {
  display: grid;
  grid-template-columns: minmax(12rem, .75fr) 2fr;
  gap: 2rem;
  padding: clamp(3rem, 9vw, 8rem) 0 clamp(3rem, 7vw, 6rem);
}
.home-intro > p,
.document-group > header > p {
  margin: .25rem 0 0;
  color: var(--muted);
  font: .72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-transform: uppercase;
}
.home-intro h1 { margin: 0 0 2rem; font-size: clamp(2.25rem, 5vw, 4.5rem); line-height: 1; letter-spacing: -.045em; }
.home-copy { max-width: 68rem; }
.home-copy > p { max-width: 54rem; }
.home-copy .home-lead { font-size: 1.16rem; }
.home-principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .5rem 2.5rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}
.home-principles p,
.home-corpus { margin: 0 0 1.5rem; color: var(--secondary); font-size: .98rem; }
.home-principles span,
.home-corpus span {
  display: block;
  margin-bottom: .45rem;
  color: var(--muted);
  font: .68rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-transform: uppercase;
}
.home-copy .home-corpus { margin-top: 1rem; padding-top: 2rem; border-top: 1px solid var(--line); }

.document-group { padding: 3.25rem 0 4.25rem; border-top: 1px solid var(--ink); }
.document-group > header { display: grid; grid-template-columns: minmax(12rem, .75fr) 2fr; gap: 2rem; margin-bottom: 2rem; }
.document-group > header div { max-width: 48rem; }
.document-group h2 { margin: 0 0 .6rem; font-size: 1.45rem; }
.document-group header p { margin-top: 0; }
.document-group ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.document-group li { border-bottom: 1px solid var(--line); }
.document-group li a {
  display: grid;
  grid-template-columns: minmax(4rem, .35fr) minmax(12rem, 1fr) minmax(18rem, 1.8fr) minmax(6rem, .4fr);
  gap: 1.25rem;
  align-items: baseline;
  margin: 0 -.75rem;
  padding: 1.05rem .75rem;
  text-decoration: none;
  transition: background-color 90ms linear, color 90ms linear;
}
.document-group li a:hover,
.document-group li a:focus-visible {
  outline: 0;
  background: var(--signal);
  color: var(--signal-ink);
}
.document-group li a:hover .document-number,
.document-group li a:hover .document-description,
.document-group li a:hover .document-status,
.document-group li a:focus-visible .document-number,
.document-group li a:focus-visible .document-description,
.document-group li a:focus-visible .document-status { color: inherit; }
.document-title::after { content: " →"; opacity: 0; transition: opacity 90ms linear, transform 90ms linear; }
.document-group li a:hover .document-title::after,
.document-group li a:focus-visible .document-title::after { opacity: 1; transform: translateX(.2rem); }
.document-number,
.document-status { color: var(--muted); font: .72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; }
.document-title { font-weight: 700; }
.document-description { color: var(--secondary); font-size: .92rem; }
.document-status { text-align: right; }

.reader-layout {
  display: grid;
  grid-template-columns: minmax(17rem, 22rem) minmax(32rem, 52rem) minmax(12rem, 1fr);
  gap: clamp(2rem, 3vw, 4rem);
  align-items: start;
  padding: clamp(2.5rem, 5vw, 5rem) 0 7rem;
}
.reader-rail { display: contents; }
.reader-index {
  grid-column: 1;
  grid-row: 1;
  position: sticky;
  top: 1rem;
  max-height: calc(100svh - 2rem);
  overflow: auto;
  padding-right: 1rem;
  scrollbar-width: thin;
}
.reader-index > header {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 0 .8rem;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
  font: .68rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-transform: uppercase;
}
.reader-index > header span { color: var(--muted); }
.reader-index-group { padding: .8rem 0 .9rem; border-bottom: 1px solid var(--line); }
.reader-index-group h2 { margin: 0 0 .45rem; padding: 0 .45rem; font-size: .72rem; line-height: 1.3; }
.reader-index-group h2 a { display: flex; gap: .65rem; text-decoration: none; }
.reader-index-group h2 span { color: var(--muted); font: .65rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; }
.reader-index-group ol { margin: 0; padding: 0; list-style: none; }
.reader-index-group li a {
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: .5rem;
  margin: 0;
  padding: .3rem .45rem;
  text-decoration: none;
}
.reader-index-group li a span { color: var(--muted); font: .62rem/1.55 ui-monospace, SFMono-Regular, Consolas, monospace; }
.reader-index-group li a strong { font-size: .76rem; line-height: 1.35; }
.reader-index-group li a:hover,
.reader-index-group li a:focus-visible,
.reader-index-group li a[aria-current="page"] {
  outline: 0;
  background: var(--signal);
  color: var(--signal-ink);
}
.reader-index-group li a:hover span,
.reader-index-group li a:focus-visible span,
.reader-index-group li a[aria-current="page"] span { color: inherit; }
.reader-index-group:not([data-current-group="true"]) ol { opacity: .68; }

.document-context {
  grid-column: 3;
  grid-row: 1;
  position: sticky;
  top: 1rem;
  max-height: calc(100svh - 2rem);
  overflow: auto;
  padding-right: .5rem;
  min-width: 0;
  font-size: .78rem;
  scrollbar-width: thin;
}
.document-meta { padding-top: .1rem; }
.document-meta p { margin: 0 0 1.3rem; overflow-wrap: anywhere; }
.document-meta span { display: block; margin-bottom: .2rem; color: var(--muted); font: .68rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; }
.document-outline { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.document-outline h2 { margin: 0 0 .7rem; color: var(--muted); font: .68rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; }
.document-outline ol { margin: 0; padding: 0; list-style: none; }
.document-outline li { margin-bottom: .48rem; line-height: 1.3; }
.document-outline .outline-level-3 { padding-left: .75rem; color: var(--muted); }
.document-outline a {
  display: block;
  padding: .16rem .38rem;
  text-decoration: none;
}
.document-outline a:hover,
.document-outline a:focus-visible,
.document-outline a[aria-current="location"] {
  outline: 0;
  background: var(--signal);
  color: var(--signal-ink);
}

.document,
.reference-copy { grid-column: 2; grid-row: 1; width: 100%; max-width: 52rem; min-width: 0; }
.document > :first-child,
.reference-copy > :first-child { margin-top: 0; }
.document h1,
.reference-copy h1 { margin-bottom: 2.5rem; font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1.08; letter-spacing: -.035em; }
.document h2 { margin: 3.5rem 0 1rem; padding-top: 1rem; border-top: 1px solid var(--line); font-size: 1.45rem; line-height: 1.2; }
.document h3 { margin: 2.4rem 0 .8rem; font-size: 1.05rem; }
.document h4 { margin: 2rem 0 .65rem; font-size: 1rem; }
.document p { margin: 0 0 1.15rem; }
.document ul,
.document ol { margin: 0 0 1.4rem; padding-left: 1.4rem; }
.document li { margin-bottom: .4rem; }
.document blockquote { margin: 1.75rem 0; padding-left: 1.25rem; border-left: 2px solid var(--ink); font-size: 1.05rem; }
.document blockquote p:last-child { margin-bottom: 0; }
.document pre { margin: 1.75rem 0; padding: 1rem; overflow: auto; background: var(--quiet); font: .8rem/1.55 ui-monospace, SFMono-Regular, Consolas, monospace; }
.document code { padding: .08rem .25rem; background: var(--quiet); font: .82em/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; }
.document pre code { padding: 0; background: transparent; font-size: inherit; }
.document table { display: block; width: 100%; margin: 1.75rem 0; overflow-x: auto; border-collapse: collapse; font-size: .85rem; }
.document th,
.document td { padding: .6rem .8rem .6rem 0; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.document img { max-width: 100%; height: auto; }
.document hr { margin: 3rem 0; border: 0; border-top: 1px solid var(--line); }
.heading-link { margin-left: .5rem; color: var(--line); font-size: .7em; text-decoration: none; }
h1:hover .heading-link,
h2:hover .heading-link,
h3:hover .heading-link,
.heading-link:focus { color: var(--muted); }

.document-outline a[aria-current="location"] { font-weight: 700; }

.document-pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 5rem;
  padding-top: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}
.document-pagination a {
  display: flex;
  min-height: 6.5rem;
  flex-direction: column;
  justify-content: space-between;
  padding: 1rem;
  background: var(--paper);
  text-decoration: none;
}
.document-pagination a:last-child { text-align: right; }
.document-pagination a span { color: var(--muted); font: .68rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-transform: uppercase; }
.document-pagination a:hover,
.document-pagination a:focus-visible { outline: 0; background: var(--signal); color: var(--signal-ink); }
.document-pagination a:hover span,
.document-pagination a:focus-visible span { color: inherit; }

.reference-copy p { max-width: 42rem; }
.reference-copy p:last-child { margin-top: 2rem; }
.not-found { min-height: 65vh; padding: 6rem 0; }
.not-found > p:first-child { color: var(--muted); font: .72rem/1.4 ui-monospace, monospace; }

.site-footer { border-top: 1px solid var(--line); border-bottom: 0; color: var(--muted); }
.site-footer span:nth-child(2) { text-align: center; }
.site-footer a { text-align: right; }

@keyframes reading-progress { to { transform: scaleX(1); } }

@media (max-width: 1180px) {
  .reader-layout { grid-template-columns: minmax(15rem, 19rem) minmax(0, 52rem); }
  .reader-rail {
    position: sticky;
    top: 1rem;
    display: block;
    grid-column: 1;
    align-self: start;
    max-height: calc(100svh - 2rem);
    overflow: auto;
    padding-right: 1rem;
  }
  .reader-index,
  .document-context { position: static; max-height: none; overflow: visible; padding-right: 0; }
  .document-context { margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--ink); }
  .document,
  .reference-copy { grid-column: 2; }
}

@media (max-width: 760px) {
  :root { font-size: 16px; }
  .site-header,
  .site-footer { grid-template-columns: 1fr auto; gap: .5rem 1rem; }
  .site-header > span { display: none; }
  .site-header nav { grid-column: 1 / -1; }
  .home-intro,
  .document-group > header,
  .reader-layout { grid-template-columns: 1fr; }
  .document,
  .reference-copy { grid-column: 1; grid-row: 2; }
  .home-intro { gap: 1rem; }
  .home-principles { grid-template-columns: 1fr; }
  .document-group li a { grid-template-columns: 3.25rem 1fr; gap: .4rem 1rem; }
  .document-description { grid-column: 2; }
  .document-status { grid-column: 2; text-align: left; }
  .reader-rail { position: static; grid-column: 1; max-height: none; overflow: visible; padding: 0 0 1.5rem; }
  .reader-index { max-height: 12rem; overflow: auto; padding: 0 0 1rem; border-bottom: 1px solid var(--line); }
  .document-context { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem 1rem; margin-top: 1rem; padding: 0 0 1.5rem; border-top: 0; border-bottom: 1px solid var(--line); }
  .document-outline { margin: 0; padding: 0; border: 0; }
  .document-meta { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem 1rem; }
  .document-meta p { margin: 0; }
  .document-pagination { grid-template-columns: 1fr; }
  .document-pagination a:last-child { text-align: left; }
  .site-footer span:nth-child(2) { text-align: right; }
  .site-footer a { grid-column: 1 / -1; text-align: left; }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .heading-link { display: none; }
  .reader-layout { display: block; width: auto; padding: 0; }
  .reader-rail { display: none; }
  .document { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}