:root {
  --ink: #121114;
  --paper: #F7F4EC;
  --muted: #6E6A61;
  --gold: #A67C00;
  --gold-soft: rgba(166, 124, 0, .22);
  --line: rgba(18, 17, 20, .13);
  --wash: rgba(18, 17, 20, .04);
  --warn: #B4472E;
  --rail: 250px;
  --sans: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
  --serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --mono: "Cascadia Mono", Consolas, "SF Mono", ui-monospace, monospace;
  color-scheme: light;
}

html[data-theme="dark"] {
  --ink: #EDE7DA;
  --paper: #121114;
  --muted: #9C968A;
  --gold: #D4AF37;
  --gold-soft: rgba(212, 175, 55, .3);
  --line: rgba(237, 231, 218, .14);
  --wash: rgba(237, 231, 218, .05);
  --warn: #E0795F;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  background: var(--paper);
  color: var(--ink);
  font: 16.5px/1.62 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration-color: var(--gold); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--gold); }
::selection { background: var(--gold-soft); }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 2px; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; padding: 8px 12px; background: var(--paper); border: 1px solid var(--line); z-index: 40; }

#progress { position: fixed; top: 0; left: 0; height: 2px; width: 0; background: var(--gold); z-index: 30; }

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 26px 20px 30px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.rail::-webkit-scrollbar { width: 8px; }
.rail::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
.rail::-webkit-scrollbar-track { background: transparent; }

.rail-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; text-decoration: none; }
.brand img { width: 30px; height: 30px; display: block; }
.brand strong { display: block; font: 600 15px/1.2 var(--sans); }
.brand small { display: block; margin-top: 2px; font: 10.5px/1.3 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }

.theme { flex: none; padding: 5px 9px; border: 1px solid var(--line); border-radius: 3px; background: transparent; color: var(--muted); font: 10px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; cursor: pointer; }
.theme:hover { color: var(--gold); border-color: var(--gold); }

.search { position: relative; }
.search input { width: 100%; padding: 9px 10px; border: 1px solid var(--line); border-radius: 3px; background: transparent; color: var(--ink); font: 13.5px/1.2 var(--sans); }
.search input::placeholder { color: var(--muted); }
.search input:focus { border-color: var(--gold); outline: none; }
.results { list-style: none; margin: 6px 0 0; padding: 0; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); }
.results:empty { display: none; }
.results a { display: block; padding: 7px 10px; font-size: 13.5px; text-decoration: none; border-bottom: 1px solid var(--line); }
.results li:last-child a { border-bottom: 0; }
.results span { display: block; font: 10.5px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }

nav h2 { margin: 0 0 6px; font: 10.5px/1.4 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
nav ul, .toc ol { list-style: none; margin: 0 0 16px; padding: 0; }
nav a { display: block; padding: 4px 0 4px 11px; border-left: 2px solid transparent; font-size: 14.5px; text-decoration: none; }
nav a:hover { border-left-color: var(--line); color: var(--ink); }
nav a[aria-current="page"] { border-left-color: var(--gold); color: var(--gold); font-weight: 600; }

.toc a { display: block; padding: 3px 0 3px 11px; border-left: 2px solid transparent; font-size: 13.5px; color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--ink); border-left-color: var(--line); }

main { padding: 42px 44px 96px 92px; max-width: calc(70ch + 136px); position: relative; }

body.no-rail { grid-template-columns: 1fr; }

.sheet, .pathline {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: flex-start;
  gap: 10px;
  margin: 0 0 22px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--gold);
  font: 11px/1 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.sheet > span:last-child, .pathline > span:last-child { margin-left: auto; }
.sheet b, .pathline b { color: var(--gold); font-weight: 600; }
.sheet i, .pathline i { font-style: normal; opacity: .5; padding: 0 2px; }

h1 { margin: 0 0 12px; font: 400 clamp(32px, 3.9vw, 46px)/1.06 var(--serif); letter-spacing: -.012em; }
.lede { max-width: 60ch; margin: 0 0 30px; font-size: 18px; color: var(--muted); }

h2 {
  position: relative;
  margin: 44px 0 12px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font: 400 23px/1.25 var(--serif);
  letter-spacing: -.005em;
}

.frag {
  position: absolute;
  left: -84px;
  top: 16px;
  width: 76px;
  text-align: right;
  font: 10px/1.2 var(--mono);
  letter-spacing: .02em;
  color: var(--muted);
  text-decoration: none;
  opacity: .5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.frag:hover { color: var(--gold); opacity: 1; }

h3 { margin: 24px 0 6px; font: 600 15.5px/1.4 var(--sans); }
p { margin: 0 0 13px; max-width: 68ch; }
ul, ol { margin: 0 0 16px; padding-left: 19px; }
li { margin: 0 0 6px; }
strong { font-weight: 600; }

code { padding: 1px 5px; border-radius: 3px; background: var(--wash); font: 13.5px/1.5 var(--mono); }
kbd { display: inline-block; padding: 1px 6px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 3px; font: 12px/1.5 var(--mono); }
.path { font: 13px/1.5 var(--mono); white-space: nowrap; }
.path i { font-style: normal; padding: 0 2px; opacity: .5; }

table { width: 100%; margin: 4px 0 22px; border-collapse: collapse; font-size: 15px; }
th { padding: 0 14px 8px 0; border-bottom: 1px solid var(--gold-soft); font: 10.5px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); text-align: left; }
td { padding: 10px 14px 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
td:last-child, th:last-child { padding-right: 0; }
tbody tr:hover { background: var(--wash); }

.note, .warn { margin: 20px 0; padding: 11px 16px; border-left: 2px solid var(--gold); background: var(--wash); }
.note b, .warn b { display: block; margin-bottom: 5px; font: 10.5px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--gold); }
.warn { border-left-color: var(--warn); }
.warn b { color: var(--warn); }
.note p:last-child, .warn p:last-child { margin-bottom: 0; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0 0 16px; }
.steps li { counter-increment: step; position: relative; margin: 0 0 14px; padding-left: 34px; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: 2px; width: 22px; height: 22px; display: grid; place-items: center; border: 1px solid var(--gold-soft); border-radius: 50%; font: 11.5px/1 var(--mono); color: var(--gold); }

.links { list-style: none; margin: 8px 0 0; padding: 0; border-top: 1px solid var(--line); }
.links li { margin: 0; border-bottom: 1px solid var(--line); }
.links a { display: flex; justify-content: space-between; gap: 18px; padding: 13px 2px; text-decoration: none; }
.links a span { max-width: 36ch; color: var(--muted); font-size: 14px; text-align: right; }
.links a:hover span { color: var(--gold); }

footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; margin-top: 56px; padding-top: 16px; border-top: 1px solid var(--line); font: 12px/1.6 var(--mono); color: var(--muted); }

.rail-toggle { display: none; }

@media (max-width: 1180px) {
  .frag { display: none; }
  main { padding-left: 44px; }
}
@media (max-width: 900px) {
  body { grid-template-columns: 1fr; }
  .rail { position: fixed; inset: 0 auto 0 0; width: min(86vw, 320px); height: 100%; background: var(--paper); border-right: 1px solid var(--line); transform: translateX(-101%); transition: transform .18s ease; z-index: 35; }
  body[data-rail="open"] .rail { transform: none; }
  body[data-rail="open"]::after { content: ""; position: fixed; inset: 0; background: rgba(0, 0, 0, .38); z-index: 34; }
  .rail-toggle { display: inline-flex; align-items: center; gap: 8px; position: sticky; top: 0; z-index: 33; width: 100%; padding: 12px 20px; border: 0; border-bottom: 1px solid var(--line); background: var(--paper); color: var(--ink); font: 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; cursor: pointer; }
  .rail-toggle b { color: var(--gold); font-weight: 600; }
  main { padding: 22px 20px 72px; max-width: none; }
  h1 { font-size: 30px; }
  h2 { font-size: 21px; margin-top: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}