/* DNO site kit: one stylesheet for every public page. Tokens are DESIGN.md's (binding).
   The block between chrome:start and chrome:end is shared with the homepage: the homepage build inlines it,
   so the header, footer, lamps and controls are the same everywhere. Edit it here only. */
/* chrome:start */
:root {
  --bg: #000000;
  --bg-2: #0A0A0A;
  --surface: #111111;
  --elevated: #161616;
  --line: #2A2A2A;
  --metal-0: #8A8A8A;
  --metal-1: #C8C8C8;
  --metal-2: #E8E8E8;
  --ink: #F3F3F3;
  --mute: #8A8A8A;
  --operable: #3DDC97;
  --elevated-risk: #D4A017;
  --degraded: #C44B4B;
  --unknown: #6B6B6B;
  --live: #00DAFF; /* telemetry / LIVE-dot only, never a brand fill */

  --sans: "IBM Plex Sans", "Helvetica Neue", Helvetica, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --measure: 1100px;
  --gutter: 16px;
  --pad: 24px;
  --radius: 2px;
  --ease: cubic-bezier(.22, .7, .18, 1);
  color-scheme: dark;
}
@media (min-width: 720px) { :root { --gutter: 24px; } }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1rem/1.55 var(--sans); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; overflow-wrap: break-word; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: var(--metal-1); text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); text-decoration-color: var(--metal-0); }
:focus-visible { outline: 2px solid var(--metal-1); outline-offset: 2px; }
::selection { background: #3A3A3A; color: var(--ink); }
code, pre, kbd, .mono { font-family: var(--mono); }
kbd { font-size: 0.8125em; padding: 1px 5px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: var(--radius); color: var(--metal-1); }
.sr { position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.wrap { max-width: calc(var(--measure) + 2 * var(--gutter)); margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: var(--gutter); top: -100px; background: var(--elevated); color: var(--ink); padding: 8px 12px; border: 1px solid var(--line); z-index: 30; }
.skip:focus { top: 8px; }

/* Controls */
.btn { font: 500 0.8125rem/1 var(--sans); color: var(--metal-1); background: transparent; border: 1px solid var(--line); border-radius: var(--radius); padding: 9px 12px; cursor: pointer; white-space: nowrap; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.btn:hover:not([disabled]) { color: var(--ink); border-color: var(--metal-0); }
.btn[disabled] { color: var(--unknown); cursor: default; }
.btn[aria-pressed="true"], .btn[aria-selected="true"] { color: var(--ink); border-color: var(--metal-1); background: var(--elevated); }
.btn-strong { color: var(--ink); border-color: var(--metal-0); background: var(--elevated); }
.seg { display: inline-flex; flex-wrap: wrap; }
.seg .btn { border-radius: 0; margin-left: -1px; }
.seg .btn:first-child { margin-left: 0; border-radius: var(--radius) 0 0 var(--radius); }
.seg .btn:last-child { border-radius: 0 var(--radius) var(--radius) 0; }
.seg .btn[aria-pressed="true"], .seg .btn[aria-selected="true"] { position: relative; z-index: 1; }
.linkbtn { font: inherit; font-size: 0.8125rem; color: var(--metal-1); background: none; border: 0; padding: 2px 0; cursor: pointer; text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
.linkbtn:hover { color: var(--ink); text-decoration-color: var(--metal-0); }
.linkbtn[aria-expanded="true"] { color: var(--ink); }
.tag { display: inline-block; font: 400 0.75rem/1.4 var(--mono); padding: 1px 6px; border: 1px solid var(--line); color: var(--mute); border-radius: var(--radius); vertical-align: 2px; margin-left: 8px; }

/* The mark: the locked raster, placed as-is (never redrawn or recoloured) */
.mark { display: block; aspect-ratio: 1; height: auto; }
.mark--nav { width: 92px; }                        /* the mark itself is about 64 px inside its clear space */
.mark--hero { width: clamp(226px, 30vw, 396px); }  /* the mark itself is about 160–280 px */

/* Status lamps: data, not decoration. An unlit (hollow) lamp is no signal. */
.ind { display: inline-block; flex: none; width: 8px; height: 8px; border: 1px solid var(--tone); background: var(--tone); }
[data-tone="ok"]      { --tone: var(--operable); }
[data-tone="warn"]    { --tone: var(--elevated-risk); }
[data-tone="bad"]     { --tone: var(--degraded); }
[data-tone="neutral"] { --tone: var(--metal-0); }
[data-tone="unknown"], [data-tone="pending"] { --tone: var(--unknown); }
.ind[data-tone="unknown"], .ind[data-tone="pending"] { background: transparent; }

/* Header */
.site-head { border-bottom: 1px solid var(--line); background: var(--bg); }
.site-head .wrap { display: flex; align-items: center; gap: 16px; }
.brand { display: flex; align-items: center; gap: 4px; margin-inline-end: auto; color: var(--metal-2); text-decoration: none; }
.brand:hover { color: var(--ink); }
.brand-name { font-weight: 500; font-size: 0.9375rem; letter-spacing: 0.01em; }
.brand-name .short { display: none; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 0.9375rem; }
.nav a { color: var(--metal-1); text-decoration: none; white-space: nowrap; }
.nav a:hover { color: var(--ink); text-decoration: underline; text-decoration-color: var(--metal-0); }
.nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-color: var(--metal-1); text-underline-offset: 6px; }
.live { display: inline-flex; align-items: center; gap: 8px; font: 500 0.8125rem/1 var(--mono); color: var(--mute); white-space: nowrap; letter-spacing: 0.02em; text-decoration: none; }
a.live:hover { color: var(--ink); }
.live .dot { position: relative; width: 6px; height: 6px; border-radius: 50%; border: 1px solid var(--unknown); }
.live .dot::after { content: ""; position: absolute; inset: -1px; border-radius: 50%; border: 1px solid var(--live); opacity: 0; }
.live[data-state="live"] .dot { background: var(--live); border-color: var(--live); }
.live[data-state="live"] { color: var(--metal-1); }
.menu { display: none; position: relative; }
.menu > summary { list-style: none; cursor: pointer; font-size: 0.9375rem; color: var(--metal-1); padding: 8px 12px; border: 1px solid var(--line); border-radius: var(--radius); }
.menu > summary::-webkit-details-marker { display: none; }
.menu[open] > summary { color: var(--ink); border-color: var(--metal-0); }
.menu ul { position: absolute; right: 0; top: calc(100% + 8px); min-width: 220px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 0; z-index: 25; }
.menu li a { display: block; padding: 10px 16px; color: var(--metal-1); text-decoration: none; }
.menu li a:hover, .menu li a[aria-current="page"] { color: var(--ink); background: var(--elevated); }
@media (max-width: 1099px) { .nav { display: none; } .menu { display: block; } }
@media (max-width: 719px) {
  :root { --pad: 16px; }
  .live { font-size: 0.75rem; }
  .brand-name .full { display: none; }
  .brand-name .short { display: inline; font-size: 1rem; }
}
@media (max-width: 359px) { .brand-name { display: none; } .site-head .wrap { gap: 12px; } }

/* Footer */
.site-foot { border-top: 1px solid var(--line); padding-block: 40px 56px; }
.site-foot .wrap { display: grid; gap: 16px; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 0.9375rem; }
.foot-nav a[aria-current="page"] { color: var(--ink); }
.foot-line { display: flex; flex-wrap: wrap; gap: 6px 0; color: var(--metal-1); font-size: 0.9375rem; }
.foot-line > * + *::before { content: "·"; display: inline-block; color: var(--mute); padding-inline: 10px; text-decoration: none; }
.site-foot .fine { font-size: 0.875rem; color: var(--mute); max-width: 46rem; }

@media (prefers-reduced-motion: no-preference) {
  .live .dot.blip::after { animation: blip 900ms var(--ease) 1; }
  @keyframes blip { 0% { opacity: .9; transform: scale(1); } 100% { opacity: 0; transform: scale(3.4); } }
  .btn, .linkbtn, a { transition: color 120ms linear, border-color 120ms linear, background-color 120ms linear; }
}
/* chrome:end */

/* ---------- Document pages ---------- */
.doc-head { padding-block: 48px 36px; border-bottom: 1px solid var(--line); }
.doc-head .wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px 48px; align-items: end; }
.doc-kicker { font: 400 0.8125rem/1.4 var(--mono); color: var(--mute); margin-bottom: 14px; }
.doc-kicker a { color: var(--mute); }
.doc-head h1 { font-size: clamp(2rem, 4.4vw, 3rem); line-height: 1.06; font-weight: 500; letter-spacing: 0.005em; color: var(--metal-2); }
.doc-lede { margin-top: 16px; font-size: 1.1875rem; line-height: 1.5; color: var(--metal-1); max-width: 42rem; }
.doc-facts { display: grid; gap: 6px; font: 400 0.8125rem/1.5 var(--mono); color: var(--mute); text-align: right; }
.doc-facts b { font-weight: 500; color: var(--metal-1); }

.doc-grid { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 56px; padding-block: 40px 72px; align-items: start; }
.doc-grid > * { min-width: 0; }
.toc { position: sticky; top: 24px; max-height: calc(100vh - 48px); overflow: auto; font-size: 0.875rem; }
.toc summary { list-style: none; cursor: default; font: 500 0.8125rem/1.4 var(--sans); color: var(--mute); padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.toc summary::-webkit-details-marker { display: none; }
.toc ol { display: grid; margin-top: 8px; counter-reset: none; }
.toc a { display: block; padding: 6px 0 6px 12px; border-left: 1px solid var(--line); color: var(--mute); text-decoration: none; line-height: 1.35; }
.toc a:hover { color: var(--ink); border-left-color: var(--metal-0); }
.toc a[aria-current="true"] { color: var(--ink); border-left: 2px solid var(--metal-2); padding-left: 11px; }
.toc .toc-sub a { padding-left: 24px; font-size: 0.8125rem; }
.toc .toc-sub a[aria-current="true"] { padding-left: 23px; }

.prose { max-width: 46rem; }
.prose > section { padding-block: 8px 40px; }
.prose > section + section { border-top: 1px solid var(--line); padding-top: 40px; }
.prose h2 { font-size: 1.5rem; line-height: 1.2; font-weight: 500; color: var(--metal-2); letter-spacing: -0.005em; margin-bottom: 16px; }
.prose h3 { font-size: 1.125rem; line-height: 1.3; font-weight: 500; color: var(--metal-2); margin: 28px 0 10px; }
.prose h4 { font-size: 1rem; font-weight: 500; color: var(--metal-1); margin: 20px 0 8px; }
.prose p { color: var(--metal-1); margin-bottom: 14px; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--ink); font-weight: 500; }
.prose em { font-style: normal; color: var(--ink); }
.prose ul, .prose ol { margin: 0 0 16px; display: grid; gap: 8px; }
.prose ul > li, .prose ol > li { position: relative; padding-left: 20px; color: var(--metal-1); }
.prose ul > li::before { content: ""; position: absolute; left: 2px; top: 0.78em; width: 8px; height: 1px; background: var(--metal-0); }
.prose ol { counter-reset: li; }
.prose ol > li { counter-increment: li; padding-left: 28px; }
.prose ol > li::before { content: counter(li); position: absolute; left: 0; top: 0.12em; font: 500 0.75rem/1.6 var(--mono); color: var(--mute); }
.prose code { font-size: 0.875em; color: var(--metal-2); background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 1px 5px; overflow-wrap: anywhere; }
.prose pre { margin: 0 0 16px; padding: 14px 16px; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); overflow-x: auto; font: 0.8125rem/1.6 var(--mono); color: var(--metal-2); }
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; overflow-wrap: normal; }
.prose .h-anchor { margin-left: 10px; font: 400 0.875rem/1 var(--mono); color: var(--unknown); text-decoration: none; opacity: 0; }
.prose h2:hover .h-anchor, .prose h3:hover .h-anchor, .prose .h-anchor:focus { opacity: 1; }
.prose .h-anchor:hover { color: var(--metal-1); }
.val { font-family: var(--mono); font-size: 0.875em; color: var(--metal-2); }
.dim { color: var(--mute); font-size: 0.875rem; }
.fine { font-size: 0.875rem; color: var(--mute); max-width: 46rem; }
.meta { font: 400 0.8125rem/1.5 var(--mono); color: var(--mute); }

/* Tables */
.tbl-wrap { width: 100%; overflow-x: auto; margin: 4px 0 18px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
.tbl caption { text-align: left; font-size: 0.8125rem; color: var(--mute); padding-bottom: 8px; caption-side: top; }
.tbl th { text-align: left; font-weight: 400; font-size: 0.8125rem; color: var(--mute); padding: 10px 14px 10px 0; border-bottom: 1px solid var(--line); vertical-align: bottom; }
.tbl td { padding: 12px 14px 12px 0; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--metal-1); }
.tbl td:first-child { color: var(--ink); }
.tbl tr:last-child td { border-bottom: 1px solid var(--line); }
.tbl .num { text-align: right; font-family: var(--mono); font-size: 0.875rem; white-space: nowrap; }
.tbl code { white-space: nowrap; }

/* Quotes from the Demos docs: the source is always named and linked */
.src-quote { margin: 4px 0 18px; padding: 12px 0 12px 18px; border-left: 2px solid var(--metal-0); }
.src-quote p { color: var(--ink); font-size: 1.0625rem; line-height: 1.5; margin: 0; }
.src-quote footer, .src-quote .by { display: block; margin-top: 8px; font: 400 0.8125rem/1.4 var(--mono); color: var(--mute); }

/* Asides and definition lists */
.aside { margin: 8px 0 20px; padding: 14px 18px; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); color: var(--metal-1); }
.aside p { margin: 0; }
.aside p + p { margin-top: 8px; }
.aside-k { display: block; font: 500 0.8125rem/1.4 var(--sans); color: var(--mute); margin-bottom: 6px; }
.kv { display: grid; grid-template-columns: 12rem minmax(0, 1fr); margin: 4px 0 18px; border-top: 1px solid var(--line); }
.kv > div { display: contents; }
.kv dt, .kv dd { padding: 10px 0; border-bottom: 1px solid var(--line); min-width: 0; }
.kv dt { color: var(--mute); font-size: 0.875rem; padding-right: 16px; }
.kv dd { color: var(--ink); }

/* Figures: diagrams say whose description they draw */
.fig { margin: 12px 0 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); }
.fig-body { padding: 18px; overflow-x: auto; }
.fig-body svg { display: block; width: 100%; height: auto; overflow: visible; }
.fig figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 16px; padding: 10px 18px; border-top: 1px solid var(--line); font-size: 0.8125rem; color: var(--mute); }
.fig figcaption .whose { font-family: var(--mono); }
.fig-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 12px 18px; border-bottom: 1px solid var(--line); }
.fig svg text { font-family: var(--sans); }
.d-box { fill: var(--bg); stroke: var(--line); }
.d-box-hi { fill: var(--elevated); stroke: var(--metal-0); }
.d-t { fill: var(--metal-2); font-size: 14px; font-weight: 500; }
.d-s { fill: var(--mute); font-size: 12px; }
.d-m { fill: var(--metal-1); font: 400 12px var(--mono); }
.d-ln { stroke: var(--metal-0); stroke-width: 1; fill: none; }
.d-ln-dim { stroke: var(--line); stroke-width: 1; fill: none; }
.d-dash { stroke: var(--unknown); stroke-width: 1; stroke-dasharray: 3 4; fill: none; }
.d-dot { fill: var(--metal-2); }
.d-dot-off { fill: none; stroke: var(--unknown); }

/* Side-by-side comparison */
.compare { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); margin: 8px 0 20px; }
.compare > div { padding: 16px 20px 18px 0; min-width: 0; }
.compare > div + div { padding-left: 20px; border-left: 1px solid var(--line); }
.compare h3 { margin: 0 0 4px; }
.compare .who { font: 400 0.8125rem/1.4 var(--mono); color: var(--mute); margin-bottom: 12px; }
.compare dl { display: grid; gap: 2px; }
.compare dt { font-size: 0.8125rem; color: var(--mute); margin-top: 10px; }
.compare dt:first-child { margin-top: 0; }
.compare dd { color: var(--metal-1); }

/* Filter chips */
.chips { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 4px 0 12px; }
.chips .k { font-size: 0.8125rem; color: var(--mute); }

/* Page-end limits list, like the homepage's */
.limits li { padding: 12px 0; border-top: 1px solid var(--line); color: var(--metal-1); }
.limits li:last-child { border-bottom: 1px solid var(--line); }
.prose .limits { gap: 0; }
.prose .limits > li { padding-left: 0; }
.prose .limits > li::before { content: none; }

.sources li a { font-family: var(--mono); font-size: 0.875rem; }
.sources li span { display: block; color: var(--mute); font-size: 0.875rem; }

@media (max-width: 999px) {
  .doc-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-top: 24px; }
  .toc { position: static; max-height: none; }
  .toc summary { cursor: pointer; }
  .toc summary::after { content: " +"; color: var(--unknown); }
  .toc[open] summary::after { content: " −"; }
  .prose { max-width: none; }
}
@media (max-width: 719px) {
  .doc-head { padding-block: 28px 24px; }
  .doc-head .wrap { grid-template-columns: minmax(0, 1fr); }
  .doc-facts { text-align: left; }
  .doc-head h1 { font-size: 1.875rem; }
  .doc-lede { font-size: 1.0625rem; }
  .compare { grid-template-columns: minmax(0, 1fr); }
  .compare > div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .kv { grid-template-columns: minmax(0, 1fr); }
  .kv dt { padding-bottom: 0; border-bottom: 0; }
  .kv dd { padding-top: 2px; }
  .fig-body { padding: 12px; }
  .tbl.stack thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .tbl.stack, .tbl.stack tbody, .tbl.stack tr, .tbl.stack td { display: block; width: 100%; }
  .tbl.stack tr { border-top: 1px solid var(--line); padding: 10px 0; }
  .tbl.stack td { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 10px; border: 0; padding: 3px 0; }
  .tbl.stack td::before { content: attr(data-label); color: var(--mute); font-size: 0.8125rem; }
  .tbl.stack code { white-space: normal; }
}
.copy-bar { display: flex; justify-content: flex-end; margin: 0 0 6px; }
.doc-intro { display: grid; gap: 10px; margin-top: 14px; max-width: 46rem; color: var(--metal-1); }
.doc-intro:empty { display: none; }
.doc-intro p { color: var(--metal-1); margin: 0; }
.doc-intro .doc-lede { margin-top: 0; }
.doc-intro code { font-size: 0.875em; color: var(--metal-2); }
.aside-warn { border-color: #5A4A1A; }
.prose .aside ul { margin: 8px 0 0; }