/* ---------------------------------------------------------------- fonts */
/* Self-hosted. A third-party font request on a docs site is a dependency
   nobody asked for, and Instrument is the right voice twice over: a display
   serif with real optical contrast, and a sans from the same drawing. */
@font-face{font-family:'Archivo';src:url('/assets/fonts/Archivo.woff2')format('woff2');
  font-weight:400 700;font-style:normal;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url('/assets/fonts/JetBrainsMono.woff2')format('woff2');
  font-weight:400 700;font-style:normal;font-display:swap}

/* --------------------------------------------------------------- tokens */
:root{
  /* Denim. A worn, slightly desaturated blue rather than a screen blue, on a
     blue-black valley - and every accent drawn from the 300-400 lightness band
     with saturation pulled back, because a full-strength blue BURNS on a dark
     surface and loses the scarcity that makes an accent work at all.

     Every pair below is measured against --night, not eyeballed:
       ink    16.6:1   ink-2  9.2:1   ink-3  5.7:1
       denim   7.8:1   signal 11.7:1  flash 17.1:1
       dark text on the denim button: 7.4:1
     The commonest failure in dev tooling is a slate-500 secondary at 4.0:1.
     --ink-3 is the floor here and it is 5.7:1. */
  --night:#080C12;          /* the valley */
  --dusk:#0D141C;           /* raised surfaces */
  --ridge:#18222E;          /* borders, edges */
  --slate:#243244;

  --brass:#4E7FB3;          /* the instrument, in shade */
  --gold:#7BA7D4;           /* the signal */
  --flash:#E6F1FB;          /* the light itself. The only near-white on the page. */
  --signal:#A8CCEC;

  --ink:#E7EDF4;
  --ink-2:#A3B4C6;
  --ink-3:#7A8CA0;          /* 5.2:1, captions only */

  --measure:68ch;
  --gutter:clamp(1rem,2.2vw,1.8rem);
  --ease:cubic-bezier(.16,1,.3,1);
}

/* ----------------------------------------------------------------- base */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--night);color:var(--ink);
  font:400 17px/1.65 'Archivo',ui-sans-serif,system-ui,sans-serif;
  font-feature-settings:'kern' 1;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* The browser's own surfaces belong to the design too. These ship with
   defaults that belong to no design system, and theming them is the cheapest
   signal that a page was built rather than assembled. */
::selection{background:var(--gold);color:var(--night)}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--night)}
::-webkit-scrollbar-thumb{background:var(--slate);border-radius:6px;border:3px solid var(--night)}
::-webkit-scrollbar-thumb:hover{background:var(--brass)}
html{scrollbar-color:var(--slate) var(--night);scrollbar-width:thin}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}
a{color:var(--gold);text-decoration-color:color-mix(in srgb,var(--gold) 42%,transparent);
  text-underline-offset:.22em;text-decoration-thickness:1px;
  transition:text-decoration-color .18s var(--ease),color .18s var(--ease)}
a:hover{color:var(--flash);text-decoration-color:var(--flash)}

/* --------------------------------------------------------------- header */
header{
  position:sticky;top:0;z-index:50;
  display:flex;gap:2rem;align-items:center;flex-wrap:wrap;
  /* Full-bleed background and border, content aligned to the shell. Without
     the max() the brand sits a few pixels off the sidebar below it, which is
     the kind of misalignment nobody names and everybody sees. */
  --gutter:clamp(1rem,2.2vw,1.8rem);
  --edge:max(var(--gutter),calc((100vw - 90rem)/2 + var(--gutter)));
  padding:.85rem var(--edge);
  background:color-mix(in srgb,var(--night) 82%,transparent);
  backdrop-filter:blur(14px) saturate(1.3);
  border-bottom:1px solid var(--ridge);
}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);
  font-family:'Archivo',sans-serif;font-weight:600;font-size:1.12rem;letter-spacing:-.02em}
.brand:hover{color:var(--ink)}
.brand svg{width:26px;height:26px;color:var(--gold);flex:none}
nav{display:flex;gap:1.35rem;flex-wrap:wrap;margin-left:auto}
/* On a docs page the sidebar carries these links, so the header keeps only
   the brand. Two copies of one navigation is a choice a reader has to make
   twice. */
body:has(.shell) header nav{display:none}
nav a{color:var(--ink-2);text-decoration:none;font-size:.93rem;position:relative;padding:.15rem 0}
nav a::after{content:'';position:absolute;left:0;right:100%;bottom:-2px;height:1px;
  background:var(--gold);transition:right .3s var(--ease)}
nav a:hover{color:var(--ink)}
nav a:hover::after,nav a.here::after{right:0}
nav a.here{color:var(--flash)}

/* ----------------------------------------------------------------- hero */
/* The authored moment. One beam crosses the valley, lands, and the log comes
   back. It runs once on load and on a slow loop after, so a page that is being
   read is not competing with its own header. */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--ridge);min-height:min(86vh,780px);display:flex;align-items:center}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero-inner{
  position:relative;z-index:2;
  max-width:min(76rem,92vw);margin:0 auto;
  width:100%;
  padding:clamp(3rem,9vh,5.5rem) clamp(1.1rem,4vw,2.5rem) clamp(9rem,22vh,13rem);
}
.hero h1{
  font-family:'Archivo',sans-serif;font-weight:600;
  font-size:clamp(2.6rem,6.6vw,4.9rem);line-height:1.02;letter-spacing:-.035em;
  margin:0 0 1.15rem;max-width:17ch;text-wrap:balance;
}
.hero h1 em{font-style:normal;color:var(--gold)}
.hero .lede{
  font-size:clamp(1.08rem,1.9vw,1.34rem);line-height:1.55;color:var(--ink-2);
  max-width:46ch;margin:0 0 2.4rem;text-wrap:pretty;
}
.cta{display:flex;gap:.85rem;flex-wrap:wrap;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.7rem 1.3rem;border-radius:7px;text-decoration:none;
  font-size:.97rem;font-weight:500;letter-spacing:.005em;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.btn-primary{background:var(--gold);color:#08131F;
  box-shadow:0 1px 2px rgba(0,0,0,.5),0 10px 26px -12px rgba(123,167,212,.5)}
.btn-primary:hover{background:var(--signal);color:#08131F;transform:translateY(-1px);
  box-shadow:0 2px 4px rgba(0,0,0,.5),0 16px 34px -12px rgba(123,167,212,.7)}
.btn-ghost{color:var(--ink);border:1px solid var(--slate);background:color-mix(in srgb,var(--dusk) 70%,transparent)}
.btn-ghost:hover{color:var(--flash);border-color:var(--brass);transform:translateY(-1px)}

/* ------------------------------------------------------------ the strip */
/* A real captured log, with a real gap in the timestamp column. The single
   most distinctive fact about this product, shown rather than described. */
.strip{border-bottom:1px solid var(--ridge);background:var(--dusk)}
.strip-inner{max-width:min(76rem,92vw);margin:0 auto;padding:2.6rem clamp(1.1rem,4vw,2.5rem)}
.strip h2{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);
  font-weight:500;margin:0 0 1.1rem}
.log{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.845rem;line-height:1.95;
  font-variant-numeric:tabular-nums;overflow-x:auto;margin:0}
.log .t{color:var(--ink-3)}
.log .gap{color:var(--gold);background:linear-gradient(90deg,
  color-mix(in srgb,var(--gold) 13%,transparent),transparent 62%);
  display:block;padding-left:.4rem;margin-left:-.4rem;border-radius:3px}

/* ---------------------------------------------------------------- shell */
/* Three columns on a docs page: navigation, the reading column, and the
   page's own headings.

   The layout this replaces was a full-bleed header above a centred 68ch
   column. The logo sat hard left, the first word of the body began a third of
   the way across, and nothing shared an edge with anything - which reads as
   broken even to a reader who could not say why, and wastes most of a wide
   window doing it.

   The gutters are deliberately small. Width here is not decoration: it is how
   much of a captured log fits on one line before it wraps, and a wrapped log
   line is harder to scan for the gap that matters. */
.shell{
  display:grid;
  grid-template-columns:15.5rem minmax(0,1fr) 13.5rem;
  gap:0 2.4rem;
  max-width:90rem;margin:0 auto;
  padding:0 var(--gutter,clamp(1rem,2.2vw,1.8rem));
  align-items:start;
}
.side{
  position:sticky;top:3.6rem;align-self:start;
  max-height:calc(100vh - 3.6rem);overflow-y:auto;
  padding:2.6rem 0 3rem;
  border-right:1px solid var(--ridge);
}
.side nav{display:flex;flex-direction:column;gap:.08rem;margin:0}
.side .grp{
  font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-3,var(--ink-2));font-weight:600;
  margin:1.5rem 0 .5rem;padding-right:2rem;
}
.side .grp:first-child{margin-top:0}
.side nav a{
  color:var(--ink-2);text-decoration:none;font-size:.92rem;
  padding:.34rem .7rem;margin-right:1.6rem;border-radius:6px;
  line-height:1.35;transition:color .15s var(--ease),background .15s var(--ease);
}
.side nav a::after{display:none}          /* the top nav's underline, not wanted here */
.side nav a:hover{color:var(--ink);background:var(--dusk)}
.side nav a.here{color:var(--ink);background:var(--dusk);font-weight:500}

.col{min-width:0}                          /* so a wide <pre> scrolls instead of stretching the grid */

/* The rail. Quiet by construction: it is a way back to a heading, not a
   second navigation competing with the first. */
.rail{
  position:sticky;top:3.6rem;align-self:start;
  max-height:calc(100vh - 3.6rem);overflow-y:auto;
  padding:3.9rem 0 3rem;
}
.rail .grp{
  font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-2);font-weight:600;margin:0 0 .6rem;
}
.rail nav{display:flex;flex-direction:column;gap:.05rem;margin:0}
.rail nav a{
  color:var(--ink-2);text-decoration:none;font-size:.85rem;line-height:1.4;
  padding:.25rem 0 .25rem .7rem;border-left:1px solid var(--ridge);
}
.rail nav a::after{display:none}
.rail nav a:hover{color:var(--ink);border-left-color:var(--gold)}

/* ------------------------------------------------------------- diagrams */
/* Coloured from the same variables as the prose, so there is no second
   palette to keep in step and they are right in whatever the theme becomes. */
.dgw{margin:2.4rem 0;padding:0}
.dg{width:100%;height:auto;display:block;color:var(--ink-2)}
.dgw figcaption{
  margin-top:.9rem;font-size:.88rem;color:var(--ink-2);line-height:1.5;
  text-wrap:pretty;
}
.dg-box rect{fill:var(--dusk);stroke:var(--ridge);stroke-width:1}
.dg-gate rect{fill:none;stroke:var(--ridge);stroke-width:1;stroke-dasharray:3 3}
.dg-chan rect{fill:var(--dusk);stroke:var(--ridge);stroke-width:1}
.dg-line path{stroke:var(--ridge);stroke-width:1.25;fill:none}
.dg-line.dg-no path{stroke-dasharray:3 3}
.dg text{font-family:'Instrument Sans',system-ui,sans-serif}
.dg-label,.dg text.dg-label{fill:var(--ink);font-size:13px;font-weight:500;text-anchor:middle}
.dg-sub,.dg text.dg-sub{fill:var(--ink-2);font-size:11px;text-anchor:middle;letter-spacing:.02em}
.dg-note text{fill:var(--ink-2);font-size:11px;text-anchor:middle}
.dg-foot{fill:var(--ink-2);font-size:11.5px;text-anchor:middle}
.dg-mono text,.dg .dg-mono text{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:12.5px;fill:var(--ink-2);text-anchor:start}
.dg-ok{fill:var(--gold);font-size:13px;font-weight:500;text-anchor:middle}
.dg-flag rect{fill:color-mix(in srgb,var(--gold) 14%,transparent);stroke:var(--gold);stroke-width:1}
.dg-flagtext{fill:var(--ink);font-size:11.5px;text-anchor:start}
.missing{color:#e06c75;font-weight:600}

/* A diagram is scanned, so it may use the whole column rather than the
   reading measure. Below that it is smaller than its own labels. */
.shell main .dgw{max-width:none;width:100%}
@media(max-width:560px){.dg text{font-size:14px}.dg-sub,.dg-foot{font-size:12px}}

/* ----------------------------------------------------------------- main */
/* Inside the shell the column already sets the width, so main only sets the
   measure it will not exceed. --measure is the line length prose is readable
   at; the column is wider than that so tables and code can use the room. */
main{max-width:var(--measure);margin:0;padding:2.6rem 0 6rem}
.shell main{max-width:min(80ch,100%)}
main.wide{max-width:min(76rem,92vw);margin:0 auto;padding:3.4rem clamp(1.1rem,4vw,2.5rem) 6rem}

/* A table or a code block may use the whole column: they are scanned, not
   read, and a 68ch table wraps cells that were meant to line up. */
.shell main table,.shell main pre{max-width:none;width:100%}

@media(max-width:1180px){
  .shell{grid-template-columns:14rem minmax(0,1fr);gap:0 2rem}
  .rail{display:none}                      /* the first column to go: it is the least load-bearing */
}
@media(max-width:820px){
  .shell{grid-template-columns:1fr;padding:0 1.1rem}
  .side{
    position:static;max-height:none;border-right:0;
    border-bottom:1px solid var(--ridge);padding:1.2rem 0;
  }
  .side nav{flex-direction:row;flex-wrap:wrap;gap:.2rem}
  .side .grp{display:none}                 /* group headings in a wrapped row are noise */
  .side nav a{margin-right:0}
  main{padding:2rem 0 4rem}
}
h1,h2,h3,h4{text-wrap:balance}
main h1{font-family:'Archivo',sans-serif;font-weight:600;
  font-size:clamp(2.1rem,4.4vw,3rem);line-height:1.08;letter-spacing:-.032em;margin:.2em 0 .5em}
main h2{font-family:'Archivo',sans-serif;font-weight:600;
  font-size:clamp(1.4rem,2.6vw,1.8rem);line-height:1.22;letter-spacing:-.022em;
  margin:2.6em 0 .6em;padding-top:1.4rem;border-top:1px solid var(--ridge)}
main h3{font-size:1.1rem;font-weight:600;margin:2.1em 0 .45em;letter-spacing:-.005em}
main h4{font-size:.98rem;font-weight:600;color:var(--ink-2);margin:1.7em 0 .35em}
p,li{margin:.85em 0;text-wrap:pretty}
strong{font-weight:600;color:var(--flash)}
em{color:var(--ink)}
ul{padding-left:1.15rem}
li::marker{color:var(--brass)}

code{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:.88em;
  background:var(--dusk);border:1px solid var(--ridge);padding:.1em .38em;border-radius:4px;
  color:var(--gold)}
pre{background:var(--dusk);border:1px solid var(--ridge);border-radius:9px;
  padding:1.05rem 1.25rem;overflow-x:auto;
  box-shadow:0 1px 2px rgba(0,0,0,.4),0 14px 34px -22px rgba(0,0,0,.9)}
pre code{background:none;border:0;padding:0;color:var(--ink);font-size:.855rem;line-height:1.62}

table{border-collapse:collapse;width:100%;margin:1.5em 0;font-size:.945rem}
th,td{text-align:left;padding:.62rem .8rem;border-bottom:1px solid var(--ridge);vertical-align:top}
th{font-weight:600;color:var(--ink-2);font-size:.82rem;letter-spacing:.06em;text-transform:uppercase}
tbody tr{transition:background .16s var(--ease)}
tbody tr:hover{background:color-mix(in srgb,var(--gold) 4%,transparent)}

/* --------------------------------------------------------------- footer */
footer{border-top:1px solid var(--ridge);background:var(--dusk);
  padding:2.6rem clamp(1.1rem,4vw,2.5rem);color:var(--ink-3);font-size:.9rem}
footer .inner{max-width:min(76rem,92vw);margin:0 auto;display:flex;gap:1.6rem;
  flex-wrap:wrap;align-items:center;justify-content:space-between}
footer p{margin:0}

/* ---------------------------------------------------------------- motion */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important}
}