:root {
  --bp: #17345f;
  --bp-2: #12294c;
  --chalk: #e8eff9;
  --chalk-70: rgba(232, 239, 249, 0.7);
  --chalk-40: rgba(232, 239, 249, 0.4);
  --chalk-20: rgba(232, 239, 249, 0.2);
  --chalk-10: rgba(232, 239, 249, 0.1);
  --paper: #f3efe6;
  --paper-2: #e9e3d6;
  --ink: #1c1915;
  --muted: #5c564c;
  --rule: rgba(28, 25, 21, 0.18);
  --ok: #9fe0b8;
  --no: #f4a08c;
  --allow: #1d5c3a;
  --deny: #8f2d1c;
  --serif: "Newsreader", Palatino, Georgia, serif;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --strip: 48px;
  --grid:
    linear-gradient(var(--chalk-10) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--chalk-10) 1px, transparent 1px) 0 0 / 24px 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--strip) + 24px); }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 17px; line-height: 1.62; padding-top: var(--strip); overflow-x: clip; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; margin: 0; }
p { margin: 0 0 16px; }
a { color: var(--bp); text-underline-offset: 3px; }
code { font-family: var(--mono); font-size: 0.88em; background: rgba(23, 52, 95, 0.08); padding: 1px 5px; overflow-wrap: anywhere; }
button { font: inherit; cursor: pointer; }
.sheet-no { border: 1px solid currentColor; padding: 2px 7px; white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 40; padding: 8px 12px; background: var(--paper); color: var(--ink); font-family: var(--mono); font-size: 13px; }
.skip:focus { top: 8px; }
:focus-visible { outline: 2px solid var(--deny); outline-offset: 2px; }

/* The title strip and the footer are in frame.css. */

.build { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px 40px; padding: 18px clamp(16px, 2.4vw, 32px) 20px; background: var(--paper-2); color: var(--ink); border-bottom: 1px solid rgba(23, 52, 95, 0.22); font-size: 14.5px; line-height: 1.45; }
.build p { margin: 0 0 8px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--bp); }
.build ul { margin: 0; padding-left: 18px; }
.build li { margin: 0 0 4px; }

/* Layout: sidebar, then a centered reading column with the sheet list beside it. */
.docs { flex: 1 0 auto; display: grid; grid-template-columns: 260px minmax(0, 1fr); align-items: start; }
.docs-stage { display: grid; grid-template-columns: minmax(0, 42rem) 200px; justify-content: center; column-gap: 56px; align-items: start; padding: 72px 40px 120px; min-width: 0; }
.side { position: sticky; top: var(--strip); height: calc(100vh - var(--strip)); overflow-y: auto; background: var(--grid), var(--bp); color: var(--chalk); padding: 26px 22px 40px; border-right: 1px solid var(--chalk-20); }
.side summary { list-style: none; cursor: default; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--chalk-70); margin-bottom: 18px; }
.side summary::-webkit-details-marker { display: none; }
.side h4 { margin: 22px 0 8px; font-family: var(--mono); font-size: 11px; font-weight: 400; letter-spacing: 0.1em; text-transform: uppercase; color: var(--chalk-70); }
.side h4:first-of-type { margin-top: 0; }
.side ul { list-style: none; margin: 0; padding: 0; }
.side li a { display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 10px; align-items: baseline; padding: 9px 10px; margin: 0 -10px; color: var(--chalk); text-decoration: none; font-size: 15px; line-height: 1.35; border-left: 2px solid transparent; }
.side li a i { font-style: normal; font-family: var(--mono); font-size: 11px; color: var(--chalk-70); }
.side li a:hover { background: var(--chalk-10); }
.side li a[aria-current="page"] { border-left-color: var(--ok); background: rgba(232, 239, 249, 0.12); }
.side .side-foot { margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--chalk-20); font-family: var(--mono); font-size: 11px; line-height: 1.6; color: var(--chalk-70); }
.side .side-foot a { color: var(--chalk); }

.docs-stage main { padding: 0; min-width: 0; }
article { max-width: none; }
.kicker { display: flex; gap: 12px; align-items: center; margin: 0 0 22px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--bp); }
.kicker::after { content: ""; flex: 1; max-width: 200px; height: 1px; background: currentColor; opacity: 0.4; }
h1 { font-size: clamp(40px, 4.4vw, 62px); line-height: 0.98; letter-spacing: -0.04em; margin-bottom: 20px; }
.lede { font-family: var(--serif); font-size: clamp(21px, 1.9vw, 25px); line-height: 1.35; letter-spacing: -0.01em; color: #36312a; margin-bottom: 28px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px 20px; padding: 10px 0; margin: 0 0 40px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font-family: var(--mono); font-size: 12px; color: var(--muted); }
h2 { font-size: clamp(28px, 2.6vw, 36px); line-height: 1.08; letter-spacing: -0.03em; margin: 56px 0 16px; padding-top: 22px; border-top: 1.5px solid var(--ink); }
h3 { font-size: 22px; line-height: 1.2; letter-spacing: -0.015em; margin: 32px 0 10px; }
article ul, article ol:not(.steps) { padding-left: 22px; margin: 0 0 18px; }
article li { margin-bottom: 6px; }

/* Commands, output, files */
.cmd { display: flex; align-items: flex-start; gap: 12px; margin: 14px 0 20px; padding: 14px 12px 14px 16px; background: var(--grid), var(--bp-2); color: var(--chalk); box-shadow: 6px 6px 0 rgba(23, 52, 95, 0.18); }
.cmd .ps { font-family: var(--mono); color: var(--chalk-40); line-height: 1.6; }
.cmd code { flex: 1; min-width: 0; background: none; padding: 0; color: var(--chalk); font-size: 14.5px; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere; font-weight: 500; }
.cmd button { flex: none; border: 1px solid var(--chalk-40); background: transparent; color: var(--chalk); font-family: var(--mono); font-size: 11.5px; padding: 5px 10px; }
.cmd button:hover { background: var(--chalk); color: var(--bp-2); }
.block { position: relative; margin: 14px 0 22px; border: 1px solid var(--rule); background: var(--paper-2); }
.block .label { display: block; padding: 6px 12px; border-bottom: 1px solid var(--rule); font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.block pre { margin: 0; padding: 12px 14px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.6; }
.block pre code { background: none; padding: 0; font-size: inherit; overflow-wrap: normal; }
.block .a { color: var(--allow); font-weight: 500; }
.block .d { color: var(--deny); font-weight: 500; }
.block .m { color: var(--muted); }

/* Callouts */
.callout { margin: 20px 0 24px; padding: 14px 18px 2px; border-left: 4px solid var(--bp); background: rgba(23, 52, 95, 0.05); }
.callout > b:first-child { display: block; margin-bottom: 6px; font-family: var(--mono); font-size: 11.5px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; }
.callout.door { border-color: var(--allow); background: rgba(29, 92, 58, 0.06); }
.callout.door > b:first-child { color: var(--allow); }
.callout.wall { border-color: var(--deny); background: rgba(143, 45, 28, 0.06); }
.callout.wall > b:first-child { color: var(--deny); }
.callout.planned { border: 1.5px dashed var(--deny); border-left-width: 4px; background: transparent; }
.callout.planned > b:first-child { color: var(--deny); }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: s; }
.steps > li { counter-increment: s; position: relative; padding: 0 0 8px 54px; margin: 0; }
.steps > li::before { content: counter(s); position: absolute; left: 0; top: 2px; width: 34px; height: 34px; border: 1.5px solid var(--bp); border-radius: 50%; display: grid; place-items: center; font-family: var(--mono); font-size: 13px; color: var(--bp); background: var(--paper); }
.steps > li::after { content: ""; position: absolute; left: 17px; top: 40px; bottom: 0; width: 1px; background: var(--rule); }
.steps > li:last-child::after { display: none; }
.steps > li > h2 { border: 0; padding-top: 0; margin: 0 0 12px; font-size: clamp(25px, 2.3vw, 31px); }

/* Tables */
.tw { margin: 16px 0 26px; overflow-x: auto; }
table.ref { width: 100%; border-collapse: collapse; font-size: 15px; border: 1.5px solid var(--bp); background: rgba(255, 255, 255, 0.25); }
table.ref th, table.ref td { border: 1px solid rgba(23, 52, 95, 0.22); padding: 10px 12px; text-align: left; vertical-align: top; }
table.ref th { font-family: var(--mono); font-size: 11px; font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: var(--bp); background: rgba(23, 52, 95, 0.05); }
table.ref td code { white-space: nowrap; overflow-wrap: normal; }
.chip { display: inline-block; padding: 1px 8px; border: 1px solid currentColor; font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; white-space: nowrap; }
.chip.ok { color: var(--allow); }
.chip.no { color: var(--deny); }
.chip.wait { color: var(--muted); border-style: dashed; }

/* Drawing used on How it works */
.drawing { margin: 18px 0 26px; padding: 18px; background: var(--grid), var(--bp); color: var(--chalk); overflow-x: auto; }
.drawing svg { display: block; width: 100%; min-width: 600px; height: auto; }
.drawing figcaption { margin-top: 10px; font-family: var(--mono); font-size: 12px; color: var(--chalk-70); }

/* Pager */
.terms { margin: 8px 0 0; }
.terms dt { margin: 26px 0 6px; font-family: var(--serif); font-size: 22px; font-weight: 500; letter-spacing: -0.01em; color: var(--bp); scroll-margin-top: calc(var(--strip) + 24px); }
.terms dt:first-child { margin-top: 0; }
.terms dd { margin: 0; padding: 0 0 18px; border-bottom: 1px solid var(--rule); }
.pager { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; margin-top: 64px; max-width: none; }
.pager a { display: block; padding: 16px 18px; border: 1.5px solid var(--bp); text-decoration: none; color: var(--ink); background: rgba(255, 255, 255, 0.3); }
.pager a:hover { background: var(--bp); color: var(--chalk); }
.pager a span { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: inherit; opacity: 0.7; margin-bottom: 4px; }
.pager a b { font-family: var(--serif); font-size: 22px; font-weight: 500; letter-spacing: -0.02em; }
.pager .next { text-align: right; grid-column: 2; }

/* On this sheet */
.toc-slot { position: sticky; top: calc(var(--strip) + 8px); min-width: 0; }
.toc { font-family: var(--mono); font-size: 12px; max-height: calc(100vh - var(--strip) - 16px); overflow-y: auto; }
.toc p { margin: 0 0 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); font-size: 11px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc a { display: block; padding: 5px 0 5px 12px; margin-left: -1px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; line-height: 1.35; }
.toc a:hover { color: var(--ink); }
.toc a.on { color: var(--ink); border-left-color: var(--bp); font-weight: 500; }
.no-js .toc { display: none; }

@media (max-width: 1180px) {
  .build { grid-template-columns: minmax(0, 1fr); }
  .docs { grid-template-columns: 260px minmax(0, 1fr); }
  .docs-stage { grid-template-columns: minmax(0, 42rem); padding: 56px 28px 96px; }
  .toc-slot { display: none; }
}
@media (max-width: 860px) {
  .docs { grid-template-columns: minmax(0, 1fr); }
  .docs-stage { padding: 36px 18px 80px; }
  .side { position: static; height: auto; padding: 14px 18px; }
  .side summary { cursor: pointer; margin: 0; display: flex; justify-content: space-between; color: var(--chalk); }
  .side summary::after { content: "Show"; color: var(--chalk-70); }
  .side details[open] summary { margin-bottom: 14px; }
  .side details[open] summary::after { content: "Hide"; }
  .docs-stage main { padding-top: 0; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .cmd { padding: 12px 10px 12px 12px; gap: 8px; }
  .cmd code { font-size: 13.5px; }
  .block pre { font-size: 12px; padding: 10px 12px; }
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager .next { grid-column: 1; }
  table.ref { font-size: 14px; border-width: 1.5px 0 0; background: none; }
  table.ref thead { display: none; }
  table.ref tr { display: block; padding: 12px 0; border-bottom: 1px solid rgba(23, 52, 95, 0.22); }
  table.ref td { display: block; border: 0; padding: 2px 0; }
  table.ref td:first-child { font-weight: 600; }
  table.ref td[data-label]:not(:first-child)::before { content: attr(data-label); display: block; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--bp); margin-top: 6px; }
  table.ref td code { white-space: normal; overflow-wrap: anywhere; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}