/* ============================================================
   Documentation
   ------------------------------------------------------------
   Its own surface, on purpose. The rest of this site is an editorial one:
   warm near-black, a display serif, wide measure, room to breathe. That is
   right for something read once from the top and wrong for a reference, which
   is entered in the middle from a search result and scanned.

   So this is cooler, denser, entirely sans, and carries its own header and
   footer. A reader should know from the first glance which kind of page they
   are on. It also loads on its own: none of site.css is needed here.
   ============================================================ */

:root{
  --dx-bg:#0b0e12;
  --dx-panel:#11151b;
  --dx-panel-2:#161b22;
  --dx-line:#1e242d;
  --dx-line-soft:#171c23;
  --dx-text:#d8dee7;
  --dx-head:#f2f5f9;
  --dx-mute:#8b95a4;
  --dx-dim:#69717e;
  --dx-accent:#6fb2ff;
  --dx-accent-soft:#9ecbff;
  --dx-code:#f0d9a8;
  --dx-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--dx-bg);color:var(--dx-text);
  font-family:"Inter",system-ui,sans-serif;
  font-size:15px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--dx-accent);text-decoration:none}
a:hover{color:var(--dx-accent-soft)}
img{max-width:100%;display:block}

/* ───────── header ───────── */
.dx-top{
  position:sticky;top:0;z-index:40;
  background:rgba(11,14,18,.86);backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--dx-line);
}
.dx-top-in{
  max-width:1400px;margin:0 auto;padding:0 clamp(1rem,3vw,1.75rem);
  height:52px;display:flex;align-items:center;gap:1rem;
}
.dx-brand{display:flex;align-items:baseline;gap:.55rem;min-width:0}
.dx-brand-name{
  font-size:.9rem;font-weight:600;color:var(--dx-head);letter-spacing:-.01em;
  font-family:var(--dx-mono);
}
.dx-brand-kind{font-size:.72rem;color:var(--dx-dim);letter-spacing:.02em}
.dx-ver{
  font-family:var(--dx-mono);font-size:.68rem;color:var(--dx-accent);
  border:1px solid rgba(111,178,255,.32);border-radius:99px;
  padding:.1rem .48rem;white-space:nowrap;
}
.dx-top-links{margin-left:auto;display:flex;align-items:center;gap:1.1rem}
.dx-top-links a{font-size:.78rem;color:var(--dx-mute)}
.dx-top-links a:hover{color:var(--dx-head)}
.dx-top-home{color:var(--dx-dim)!important}
@media(max-width:700px){
  .dx-top-links a.dx-hide-sm{display:none}
  .dx-brand-kind{display:none}
}

/* ───────── shell ───────── */
.dx-shell{
  max-width:1400px;margin:0 auto;padding:0 clamp(1rem,3vw,1.75rem);
  display:grid;grid-template-columns:15rem minmax(0,1fr) 13.5rem;
  gap:clamp(1.5rem,3.5vw,3rem);align-items:start;
}

/* ───────── sidebar ───────── */
.dx-side{position:sticky;top:52px;max-height:calc(100vh - 52px);overflow-y:auto;padding:1.6rem 0 2rem}
.dx-side::-webkit-scrollbar{width:6px}
.dx-side::-webkit-scrollbar-thumb{background:var(--dx-line);border-radius:3px}
.dx-side-label{
  display:block;font-size:.66rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dx-dim);padding:0 .7rem .6rem;
}
.dx-side ol{list-style:none;margin:0;padding:0;counter-reset:dx}
.dx-side li{counter-increment:dx}
.dx-side a{
  display:block;position:relative;padding:.38rem .7rem .38rem 2.2rem;
  font-size:.83rem;line-height:1.45;color:var(--dx-mute);
  border-left:2px solid transparent;border-radius:0 5px 5px 0;
  transition:color .13s,background .13s,border-color .13s;
}
.dx-side a::before{
  content:counter(dx,decimal-leading-zero);
  position:absolute;left:.75rem;top:.46rem;
  font-family:var(--dx-mono);font-size:.62rem;color:var(--dx-dim);
}
.dx-side a:hover{color:var(--dx-head);background:var(--dx-panel)}
.dx-side a.is-here{
  color:var(--dx-accent);background:var(--dx-panel);border-left-color:var(--dx-accent);font-weight:500;
}
.dx-side a.is-here::before{color:var(--dx-accent)}

/* ───────── content ───────── */
.dx-main{min-width:0;padding:1.9rem 0 4rem;max-width:47rem}
.dx-crumb{
  display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;margin:0 0 .9rem;
  font-size:.74rem;color:var(--dx-dim);
}
.dx-crumb a{color:var(--dx-dim)}
.dx-crumb a:hover{color:var(--dx-accent)}
.dx-main h1{
  font-size:1.95rem;font-weight:600;line-height:1.2;letter-spacing:-.022em;
  color:var(--dx-head);margin:0 0 .55rem;
}
.dx-lede{font-size:1.02rem;line-height:1.65;color:var(--dx-mute);margin:0 0 2.2rem;max-width:52ch}
.dx-meta{
  display:flex;flex-wrap:wrap;gap:.45rem;align-items:center;margin:0 0 2.2rem;
  font-family:var(--dx-mono);font-size:.72rem;color:var(--dx-dim);
}

/* ───────── prose ───────── */
.dx-prose{font-size:.95rem;line-height:1.78}
.dx-prose > *:first-child{margin-top:0}
.dx-prose p{margin:0 0 1.1rem;color:var(--dx-text)}
.dx-prose h2{
  font-size:1.18rem;font-weight:600;letter-spacing:-.015em;color:var(--dx-head);
  margin:2.6rem 0 .85rem;padding-top:.3rem;scroll-margin-top:4.2rem;
}
.dx-prose h3{
  font-size:1rem;font-weight:600;color:var(--dx-head);
  margin:2rem 0 .7rem;scroll-margin-top:4.2rem;
}
.dx-prose strong{color:var(--dx-head);font-weight:600}
.dx-prose ul,.dx-prose ol{margin:0 0 1.2rem;padding-left:1.3rem}
.dx-prose li{margin-bottom:.45rem}
.dx-prose li::marker{color:var(--dx-dim)}
.dx-prose blockquote{
  margin:0 0 1.3rem;padding:.75rem 1.1rem;
  border-left:2px solid var(--dx-accent);background:var(--dx-panel);
  border-radius:0 6px 6px 0;color:var(--dx-mute);
}
.dx-prose blockquote p:last-child{margin-bottom:0}
.dx-prose hr{border:0;border-top:1px solid var(--dx-line);margin:2.4rem 0}

.dx-prose code{
  font-family:var(--dx-mono);font-size:.855em;color:var(--dx-code);
  background:var(--dx-panel-2);border:1px solid var(--dx-line);
  padding:.08em .38em;border-radius:4px;white-space:nowrap;
}
.dx-prose pre{
  margin:0 0 1.35rem;padding:1rem 1.15rem;overflow-x:auto;
  background:#080a0d;border:1px solid var(--dx-line);border-radius:8px;
}
.dx-prose pre code{
  background:none;border:0;padding:0;white-space:pre;
  color:#cfd7e2;font-size:.82rem;line-height:1.75;
}

/* Tables carry the command reference, so they are the densest thing here. */
.dx-prose .pt-wrap,.dx-prose > table{margin:0 0 1.5rem;overflow-x:auto}
.dx-prose table{width:100%;border-collapse:collapse;font-size:.84rem}
.dx-prose th{
  text-align:left;font-weight:600;color:var(--dx-dim);
  font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  padding:.5rem .8rem;border-bottom:1px solid var(--dx-line);white-space:nowrap;
}
.dx-prose td{
  padding:.6rem .8rem;border-bottom:1px solid var(--dx-line-soft);
  color:var(--dx-mute);vertical-align:top;line-height:1.6;
}
.dx-prose tr:hover td{background:var(--dx-panel)}
.dx-prose td:first-child{white-space:nowrap}
.dx-prose td code{background:none;border:0;padding:0;color:var(--dx-code)}

/* ───────── prev / next ───────── */
.dx-pager{
  display:grid;grid-template-columns:1fr 1fr;gap:.7rem;
  margin-top:3.2rem;padding-top:1.6rem;border-top:1px solid var(--dx-line);
}
.dx-pager a{
  display:flex;flex-direction:column;gap:.25rem;padding:.8rem 1rem;
  border:1px solid var(--dx-line);border-radius:7px;background:var(--dx-panel);
  transition:border-color .13s,background .13s;
}
.dx-pager a:hover{border-color:rgba(111,178,255,.4);background:var(--dx-panel-2)}
.dx-pager .next{text-align:right}
.dx-pg-dir{font-size:.68rem;letter-spacing:.08em;color:var(--dx-dim)}
.dx-pg-title{font-size:.88rem;color:var(--dx-text);font-weight:500}
.dx-pager a:hover .dx-pg-title{color:var(--dx-accent)}

/* ───────── on this page ───────── */
.dx-toc{position:sticky;top:52px;max-height:calc(100vh - 52px);overflow-y:auto;padding:1.9rem 0 2rem}
.dx-toc-label{
  display:block;font-size:.66rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dx-dim);margin-bottom:.6rem;
}
.dx-toc ol{list-style:none;margin:0;padding:0}
.dx-toc a{
  display:block;padding:.26rem 0 .26rem .75rem;font-size:.78rem;line-height:1.5;
  color:var(--dx-dim);border-left:1px solid var(--dx-line);transition:color .13s,border-color .13s;
}
.dx-toc a:hover{color:var(--dx-text)}
.dx-toc li.is-sub a{padding-left:1.5rem}
.dx-toc li.is-on a{color:var(--dx-accent);border-left-color:var(--dx-accent)}

/* ───────── index ───────── */
.dx-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem;margin:0 0 2.6rem}
.dx-card{
  display:block;padding:1.05rem 1.15rem;border:1px solid var(--dx-line);border-radius:8px;
  background:var(--dx-panel);transition:border-color .13s,background .13s;
}
.dx-card:hover{border-color:rgba(111,178,255,.42);background:var(--dx-panel-2)}
.dx-card-n{font-family:var(--dx-mono);font-size:.66rem;color:var(--dx-dim);display:block;margin-bottom:.4rem}
.dx-card:hover .dx-card-n{color:var(--dx-accent)}
.dx-card-t{display:block;font-size:.97rem;font-weight:600;color:var(--dx-head);margin-bottom:.32rem}
.dx-card-s{display:block;font-size:.83rem;line-height:1.6;color:var(--dx-mute)}
@media(max-width:820px){.dx-cards{grid-template-columns:1fr}}

.dx-start{margin:0 0 2.4rem}
.dx-start-label{
  display:block;font-size:.66rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dx-dim);margin-bottom:.55rem;
}
.dx-start pre{
  margin:0;padding:1rem 1.15rem;overflow-x:auto;
  background:#080a0d;border:1px solid var(--dx-line);border-radius:8px;
}
.dx-start code{font-family:var(--dx-mono);font-size:.82rem;line-height:1.8;color:#cfd7e2;white-space:pre}
.dx-start .c{color:var(--dx-dim)}

/* ───────── footer ───────── */
.dx-foot{
  border-top:1px solid var(--dx-line);margin-top:2rem;
  background:var(--dx-panel);
}
.dx-foot-in{
  max-width:1400px;margin:0 auto;padding:1.5rem clamp(1rem,3vw,1.75rem);
  display:flex;flex-wrap:wrap;gap:.8rem 1.6rem;align-items:center;
  font-size:.76rem;color:var(--dx-dim);
}
.dx-foot a{color:var(--dx-mute)}
.dx-foot a:hover{color:var(--dx-accent)}
.dx-foot-gen{font-family:var(--dx-mono);font-size:.7rem;margin-left:auto}
@media(max-width:700px){.dx-foot-gen{margin-left:0;width:100%}}

/* ───────── narrower ───────── */
@media(max-width:1180px){
  .dx-shell{grid-template-columns:14rem minmax(0,1fr)}
  .dx-toc{display:none}
}
@media(max-width:860px){
  .dx-shell{grid-template-columns:1fr;gap:0}
  .dx-side{position:static;max-height:none;overflow:visible;padding:1rem 0 0}
  .dx-side-in{border:1px solid var(--dx-line);border-radius:8px;background:var(--dx-panel);padding:.6rem .4rem}
  .dx-side-label{display:none}
  /* A checkbox rather than <details>: a closed details element hides its own
     children in a way no media query can undo, so the desktop column came back
     collapsed. This way the wide layout simply never consults the toggle. */
  .dx-nav-label{
    display:block;cursor:pointer;position:relative;
    padding:.35rem .7rem;font-size:.8rem;font-weight:600;color:var(--dx-head);
  }
  .dx-nav-label::after{
    content:"";position:absolute;right:.9rem;top:.62rem;width:.46rem;height:.46rem;
    border-right:1.5px solid var(--dx-mute);border-bottom:1.5px solid var(--dx-mute);
    transform:rotate(45deg);transition:transform .15s;
  }
  .dx-side ol{display:none}
  .dx-nav-toggle:checked ~ .dx-nav-label::after{transform:rotate(-135deg)}
  .dx-nav-toggle:checked ~ ol{
    display:block;margin-top:.55rem;padding-top:.55rem;border-top:1px solid var(--dx-line-soft);
  }
  .dx-main{padding-top:1.4rem;max-width:none}
  .dx-main h1{font-size:1.65rem}
  .dx-pager{grid-template-columns:1fr}
  .dx-pager .next{text-align:left}
}
/* On a wide screen the sidebar is a column, and the toggle does not exist. */
@media(min-width:861px){
  .dx-nav-label{display:none}
}

/* The index has no "on this page", so it does not keep the column open. */
.dx-shell-wide{grid-template-columns:15rem minmax(0,1fr)}
@media(max-width:860px){.dx-shell-wide{grid-template-columns:1fr}}

/* Grouped navigation. Seventeen numbered links say there is a sequence; the
   same links under six headings say what the sequence is. */
.dx-nav{display:block}
.dx-nav .dx-side-label{padding-top:1.05rem}
.dx-nav > ol:first-of-type .dx-side-label{padding-top:0}
.dx-side ol{counter-reset:none}
.dx-side a{padding-left:.95rem}
.dx-side a::before{content:none}
.dx-group{
  font-size:.7rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dx-dim);margin:2.2rem 0 .75rem;
}
.dx-group:first-of-type{margin-top:0}
.dx-card-t{margin-bottom:.32rem}