/* RoboCanvas website. One stylesheet, no framework, no web fonts.
 *
 * The system, in one place:
 *   colour   ink and paper sections alternate; one signal colour (the product's
 *            teal) marks the primary action, focus and "verified" -- nothing else
 *   type     two voices: a grotesk for statements, a monospace for labels
 *   grid     12 columns; labels in columns 1-3, content from column 4 or 7
 *   images   real product captures, square-cornered, hairline-framed, captioned
 *   motion   short fades and rises that end in place; none with reduced motion
 */

:root {
  /* colour */
  --ink: #0b0c0d;
  --ink-2: #15171a;
  --paper: #f2f1ec;
  --white: #ffffff;
  --text-on-paper: #0b0c0d;
  --mute-on-paper: #565a5e;
  --text-on-ink: #f2f1ec;
  --mute-on-ink: #9b9fa3;
  --rule-on-paper: rgba(11, 12, 13, 0.16);
  --rule-on-ink: rgba(242, 241, 236, 0.18);
  --signal: #33bfb8;        /* on ink */
  --signal-hover: #5fd6d0;
  --signal-deep: #0f6a6f;   /* on paper: 5.9:1 on --paper */
  --partial: #94600f;
  --partial-on-ink: #e2a84a;
  --none: #a8331e;
  --none-on-ink: #f0866f;

  /* type */
  --sans: "Segoe UI Variable Display", "Segoe UI Variable Text", "SF Pro Display", -apple-system,
          system-ui, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --t-display: clamp(42px, 7.2vw, 118px);
  --t-title: clamp(38px, 5.4vw, 84px);
  --t-index: clamp(34px, 5vw, 80px);
  --t-statement: clamp(23px, 2.65vw, 40px);
  --t-lead: clamp(18px, 1.45vw, 21px);
  --t-h3: clamp(19px, 1.5vw, 23px);
  --t-body: 17px;
  --t-small: 14.5px;
  --t-label: 12px;

  /* space and grid */
  --margin: clamp(20px, 3.4vw, 48px);
  --gutter: clamp(16px, 1.8vw, 28px);
  --section: clamp(84px, 11vw, 168px);
  --rhythm: clamp(28px, 3vw, 48px);
  --nav-h: 56px;

  /* motion */
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --fast: 160ms;
  --slow: 640ms;
}

/* ---------------------------------------------------------------- base -- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--nav-h) + 28px); scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--text-on-paper);
  font: 400 var(--t-body)/1.55 var(--sans); font-kerning: normal;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, p, ul, ol, figure, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
code, kbd, pre, samp { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code { padding: 0.08em 0.3em; background: rgba(11, 12, 13, 0.06); border-radius: 2px; overflow-wrap: anywhere; }
.ink :not(pre) > code { background: rgba(242, 241, 236, 0.1); }
::selection { background: var(--signal); color: var(--ink); }
:focus-visible { outline: 2px solid var(--signal-deep); outline-offset: 3px; }
.ink :focus-visible, .site-header :focus-visible, .site-footer :focus-visible { outline-color: var(--signal); }

a { color: inherit; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.22em; }
a:hover { text-decoration-thickness: 2px; }

.skip { position: absolute; left: var(--margin); top: -60px; z-index: 100; padding: 10px 14px; background: var(--signal);
  color: var(--ink); font: 600 var(--t-label)/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; text-decoration: none; }
.skip:focus { top: 12px; }

/* --------------------------------------------------------------- tones -- */
.ink { background: var(--ink); color: var(--text-on-ink); color-scheme: dark; }
.paper { background: var(--paper); color: var(--text-on-paper); color-scheme: light; }
.ink .label, .ink figcaption { color: var(--mute-on-ink); }

/* ---------------------------------------------------------------- grid -- */
.wrap { padding-inline: var(--margin); }
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); }
.span-all { grid-column: 1 / -1; }
.col-label { grid-column: 1 / span 3; }
.col-main { grid-column: 4 / -1; }
.col-read { grid-column: 4 / span 7; }
.col-right { grid-column: 7 / -1; }
.col-left { grid-column: 1 / span 5; }
@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-label, .col-main, .col-read, .col-right, .col-left { grid-column: 1 / -1; }
  .col-label { margin-bottom: 20px; }
}
section { padding-block: var(--section); }

/* ---------------------------------------------------------- typography -- */
.label {
  display: block; font: 500 var(--t-label)/1.5 var(--mono); letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--mute-on-paper);
}
.label .n { color: var(--text-on-paper); margin-right: 0.8em; }
.ink .label .n { color: var(--text-on-ink); }
.display {
  font-size: var(--t-display); font-weight: 600; line-height: 0.95; letter-spacing: -0.042em;
}
.display .line { display: block; }
.display .soft { color: var(--mute-on-ink); }
.title { font-size: var(--t-title); font-weight: 600; line-height: 0.98; letter-spacing: -0.036em; text-wrap: balance; }
.statement { font-size: var(--t-statement); font-weight: 500; line-height: 1.2; letter-spacing: -0.018em; text-wrap: pretty; }
.statement .soft { color: var(--mute-on-paper); }
.ink .statement .soft { color: var(--mute-on-ink); }
.lead { font-size: var(--t-lead); line-height: 1.5; max-width: 36em; }
.h3 { font-size: var(--t-h3); font-weight: 600; line-height: 1.25; letter-spacing: -0.012em; }
.small { font-size: var(--t-small); line-height: 1.55; }
.soft { color: var(--mute-on-paper); }
.ink .soft { color: var(--mute-on-ink); }
.stack > * + * { margin-top: 1em; }

/* -------------------------------------------------------------- header -- */
/* The navbar is an object, not a strip: one ink plate hanging from the top
   edge, sized to its contents. Brand on the left, five plain links, one solid
   action. Square, hairline-edged, no shadow; the same plate over ink and paper.
   On phones it keeps its form at full width and opens a numbered index below. */
.site-header {
  position: fixed; top: 0; left: 50%; z-index: 50; transform: translateX(-50%);
  width: max-content; max-width: calc(100% - 24px);
  color: var(--text-on-ink); color-scheme: dark;
}
.plate {
  display: flex; align-items: center; gap: clamp(20px, 2.6vw, 40px);
  height: var(--nav-h); padding: 0 9px 0 18px;
  background: var(--ink); border: 1px solid var(--rule-on-ink); border-top: 0;
}
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; color: var(--text-on-ink); }
.brand:hover { text-decoration: none; }
/* The logo (site/_partials/brand.html), 44 px tall: its type stays legible at 1x. */
.brand-logo { display: block; height: 44px; width: auto; }
.brand .tag { font: 500 10px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--mute-on-ink);
  padding: 4px 5px 3px; border: 1px solid var(--rule-on-ink); }
.nav { display: flex; align-items: center; gap: clamp(16px, 1.7vw, 26px); }
.nav a { position: relative; font-size: 14px; font-weight: 500; letter-spacing: -0.01em; text-decoration: none;
  color: rgba(242, 241, 236, 0.64); padding: 16px 0; transition: color var(--fast) var(--ease); }
.nav a:hover { color: var(--text-on-ink); text-decoration: none; }
/* The current page is marked where the plate meets the page. */
.nav a[aria-current="page"] { color: var(--text-on-ink); }
.nav a[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--signal); }
.nav-cta { display: inline-flex; align-items: center; gap: 12px; height: 34px; padding: 0 13px; background: var(--signal);
  color: var(--ink); font-size: 13px; font-weight: 600; letter-spacing: -0.005em; text-decoration: none; border-radius: 2px;
  transition: background-color var(--fast) var(--ease); }
.nav-cta:hover { background: var(--signal-hover); color: var(--ink); text-decoration: none; }
.nav-cta .arrow { transition: transform var(--fast) var(--ease); }
.nav-cta:hover .arrow { transform: translateX(3px); }
.nav-cta:active { transform: translateY(1px); }

.menu { display: none; }
.menu summary { list-style: none; cursor: pointer; height: 34px; display: inline-flex; align-items: center; padding: 0 12px;
  font-size: 13px; font-weight: 600; color: var(--text-on-ink); border: 1px solid var(--rule-on-ink); border-radius: 2px; }
.menu summary::-webkit-details-marker { display: none; }
.menu summary:hover { border-color: var(--text-on-ink); }
.menu .when-open { display: none; }
.menu[open] .when-open { display: inline; }
.menu[open] .when-closed { display: none; }
.menu[open] summary { background: var(--text-on-ink); color: var(--ink); border-color: var(--text-on-ink); }
.menu-panel { position: absolute; left: 0; right: 0; top: 100%; background: var(--ink); border: 1px solid var(--rule-on-ink);
  border-top: 0; padding: 4px 18px 20px; max-height: calc(100vh - var(--nav-h) - 24px); overflow-y: auto; }
.menu-panel li a { display: grid; grid-template-columns: 2.4em 1fr; align-items: baseline; padding: 15px 0;
  border-bottom: 1px solid var(--rule-on-ink); text-decoration: none; font-size: 22px; font-weight: 600; letter-spacing: -0.02em; }
.menu-panel li a .n { font: 500 11px/1 var(--mono); letter-spacing: 0.08em; color: var(--mute-on-ink); }
.menu-panel li a[aria-current="page"] { color: var(--signal); }
/* The same action as on the plate, in the same voice. */
.menu-panel .menu-cta { margin-top: 18px; width: 100%; font: 600 15px/1 var(--sans); letter-spacing: -0.005em; text-transform: none; }

@media (max-width: 1020px) {
  .site-header { width: calc(100% - 24px); }
  .plate { gap: 10px; padding-right: 7px; }
  .nav { display: none; }
  .brand { margin-right: auto; }
  .menu { display: block; }
  .nav-cta { padding: 0 11px; }
}
@media (max-width: 420px) {
  .nav-cta .arrow { display: none; }
  .brand .tag { display: none; }
}
/* The index repeats the action, so the narrowest phones keep brand and Menu. */
@media (max-width: 359px) { .nav-cta { display: none; } }

/* ------------------------------------------------------------- buttons -- */
.btn {
  --btn-bg: transparent; --btn-fg: currentColor; --btn-line: currentColor;
  display: inline-flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 48px; padding: 0 18px;
  background: var(--btn-bg); color: var(--btn-fg); border: 1px solid var(--btn-line); border-radius: 2px;
  font: 600 12.5px/1 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; text-decoration: none; cursor: pointer;
  transition: background-color var(--fast) var(--ease), color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.btn .arrow { display: inline-block; transition: transform var(--fast) var(--ease); }
.btn:hover { text-decoration: none; }
.btn:hover .arrow { transform: translateX(3px); }
.btn:active { transform: translateY(1px); }
.btn-primary { --btn-bg: var(--signal); --btn-fg: var(--ink); --btn-line: var(--signal); }
.btn-primary:hover { --btn-bg: var(--signal-hover); --btn-line: var(--signal-hover); }
.paper .btn-primary { --btn-bg: var(--ink); --btn-fg: var(--paper); --btn-line: var(--ink); }
.paper .btn-primary:hover { --btn-bg: var(--signal-deep); --btn-line: var(--signal-deep); }
.btn-quiet { --btn-line: var(--rule-on-ink); }
.paper .btn-quiet { --btn-line: var(--rule-on-paper); }
.btn-quiet:hover { --btn-line: currentColor; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.38; cursor: not-allowed; transform: none; }
.btn:disabled:hover .arrow { transform: none; }
.btn-small { min-height: 38px; padding: 0 14px; font-size: 11.5px; gap: 12px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* --------------------------------------------------------------- hero -- */
.hero { padding-top: calc(var(--nav-h) + clamp(40px, 6vw, 92px)); padding-bottom: 0; }
.hero .meta { margin-bottom: clamp(36px, 5vw, 76px); row-gap: 8px; }
.hero .meta .label { grid-column: span 4; }
.hero .display { grid-column: 1 / span 12; }
.hero .intro { grid-column: 1 / span 6; margin-top: clamp(26px, 3vw, 44px); }
.hero .intro .lead { color: var(--mute-on-ink); }
.hero .intro .lead strong { color: var(--text-on-ink); font-weight: 500; }
.hero .intro .actions { margin-top: 30px; }
.hero .facts { grid-column: 9 / -1; align-self: end; }
.hero .facts li { display: flex; justify-content: space-between; gap: 16px; padding: 9px 0; border-top: 1px solid var(--rule-on-ink); }
.hero .facts li:last-child { border-bottom: 1px solid var(--rule-on-ink); }
.hero .facts .label { color: var(--mute-on-ink); }
.hero .facts .v { font-size: var(--t-small); text-align: right; }
.hero-shot { margin-top: clamp(44px, 6vw, 92px); }
.hero-shot img { width: 100%; border: 1px solid var(--rule-on-ink); border-bottom: 0; }
@media (max-width: 900px) {
  .hero .meta .label { grid-column: 1 / -1; }
  .hero .meta .label:nth-child(n + 2) { display: none; }
  .hero .display, .hero .intro, .hero .facts { grid-column: 1 / -1; }
  .hero .facts { margin-top: 36px; }
}

/* ------------------------------------------------------------ figures -- */
figure.shot img { width: 100%; border: 1px solid var(--rule-on-paper); background: var(--white); }
.ink figure.shot img { border-color: var(--rule-on-ink); background: var(--ink-2); }
figcaption { margin-top: 12px; font: 500 var(--t-label)/1.6 var(--mono); letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--mute-on-paper); max-width: 80ch; }
figcaption .fig { color: var(--text-on-paper); margin-right: 0.7em; }
.ink figcaption .fig { color: var(--text-on-ink); }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gutter); }
@media (max-width: 700px) { .pair { grid-template-columns: 1fr; } }

/* --------------------------------------------------- ruled index lists -- */
.ruled > li { display: grid; grid-template-columns: 3.6em minmax(0, 1fr); column-gap: var(--gutter);
  padding: 18px 0 20px; border-top: 1px solid var(--rule-on-paper); }
.ruled > li:last-child { border-bottom: 1px solid var(--rule-on-paper); }
.ink .ruled > li { border-color: var(--rule-on-ink); }
.ruled .n { font: 500 var(--t-label)/2 var(--mono); letter-spacing: 0.08em; color: var(--mute-on-paper); }
.ink .ruled .n { color: var(--mute-on-ink); }
.ruled .h3 + p, .ruled .h3 + .label { margin-top: 6px; }
.ruled-3 > li { grid-template-columns: 3.6em minmax(0, 0.9fr) minmax(0, 1.5fr); }
@media (max-width: 760px) {
  .ruled-3 > li { grid-template-columns: 3em minmax(0, 1fr); }
  .ruled-3 > li > :last-child { grid-column: 2; margin-top: 6px; }
}

/* ------------------------------------------------------- the workflow -- */
.steps { margin-top: clamp(48px, 6vw, 96px); }
.step { padding-block: clamp(36px, 4vw, 64px); border-top: 1px solid var(--rule-on-paper); row-gap: 24px; }
.step:last-child { border-bottom: 1px solid var(--rule-on-paper); }
.step-text { grid-column: 1 / span 4; align-self: start; position: sticky; top: 96px; }
.step-text .n { font: 500 var(--t-label)/1 var(--mono); letter-spacing: 0.09em; color: var(--mute-on-paper); }
.step-text h3 { font-size: clamp(26px, 2.6vw, 40px); font-weight: 600; line-height: 1.04; letter-spacing: -0.028em; margin-top: 18px; }
.step-text p { margin-top: 16px; color: var(--mute-on-paper); }
.step-text p strong { color: var(--text-on-paper); font-weight: 600; }
.step-shot { grid-column: 5 / -1; }
@media (max-width: 900px) { .step-text { position: static; } .step-text, .step-shot { grid-column: 1 / -1; } }
pre.cmd { margin-top: 18px; padding: 16px 18px; background: var(--ink); color: var(--text-on-ink); border-radius: 2px;
  font-size: 13px; line-height: 1.65; overflow-x: auto; white-space: pre; }
pre.cmd .c { color: var(--mute-on-ink); }

/* ------------------------------------------------- the samples index -- */
.samples { margin-top: clamp(48px, 6vw, 96px); }
.sample { padding-block: 26px 40px; border-top: 1px solid var(--rule-on-ink); }
.sample:last-child { border-bottom: 1px solid var(--rule-on-ink); }
.sample-name { font-size: var(--t-index); font-weight: 600; line-height: 1; letter-spacing: -0.04em; }
.sample-name button { all: unset; cursor: pointer; display: inline; }
.sample-name button:focus-visible { outline: 2px solid var(--signal); outline-offset: 6px; }
.sample-facts { margin-top: 20px; display: grid; gap: 8px; max-width: 46em; }
.sample-facts li { display: grid; grid-template-columns: 8.5em minmax(0, 1fr); gap: 14px; font-size: var(--t-small); line-height: 1.5; color: var(--mute-on-ink); }
.sample-facts li .k { font: 500 11px/1.9 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.sample-facts li strong { color: var(--text-on-ink); font-weight: 500; }
.sample figure { margin-top: 26px; }
@media (max-width: 560px) { .sample-facts li { grid-template-columns: 1fr; gap: 0; } }
/* Enhanced (script, wide screens): the names form one list on the left and the
   active sample's capture holds on the right; the other names recede. */
.samples.enhanced { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); }
.samples.enhanced .sample-list { grid-column: 1 / span 6; }
.samples.enhanced .sample figure { display: none; }
.samples.enhanced .sample { padding-block: 20px 24px; }
.samples.enhanced .sample-name { color: rgba(242, 241, 236, 0.3); transition: color var(--fast) var(--ease); }
.samples.enhanced .sample-name button:hover { color: rgba(242, 241, 236, 0.7); }
.samples.enhanced .sample-facts { display: none; }
.samples.enhanced .sample.active .sample-name, .samples.enhanced .sample.active .sample-name button:hover { color: var(--text-on-ink); }
.samples.enhanced .sample.active .sample-facts { display: grid; }
.sample-stage { display: none; }
.samples.enhanced .sample-stage { display: block; grid-column: 7 / -1; position: sticky; top: 96px; align-self: start; }
.sample-stage img { animation: settle 420ms var(--ease); }

/* ------------------------------------------------------ status marks -- */
.status { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; font: 600 11px/1.4 var(--mono);
  letter-spacing: 0.09em; text-transform: uppercase; }
.status::before { content: ""; width: 9px; height: 9px; background: currentColor; flex: none; }
.s-ok { color: var(--signal-deep); }
.s-partial { color: var(--partial); }
.s-frame { color: var(--mute-on-paper); }
.s-frame::before { background: transparent; box-shadow: inset 0 0 0 1.5px currentColor; }
.s-no { color: var(--none); }
.s-open { color: var(--mute-on-paper); }
.s-open::before { border-radius: 50%; background: transparent; box-shadow: inset 0 0 0 1.5px currentColor; }
.ink .s-ok { color: var(--signal); }
.ink .s-partial { color: var(--partial-on-ink); }
.ink .s-no { color: var(--none-on-ink); }
.ink .s-frame, .ink .s-open { color: var(--mute-on-ink); }
.legend { display: flex; flex-wrap: wrap; gap: 10px 28px; }

/* -------------------------------------------------------------- tables -- */
.table { width: 100%; border-collapse: collapse; font-size: var(--t-small); line-height: 1.5; }
.table th, .table td { text-align: left; vertical-align: top; padding: 14px 18px 14px 0; border-top: 1px solid var(--rule-on-paper); }
.table thead th { font: 500 var(--t-label)/1.4 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; color: var(--mute-on-paper);
  border-top: 0; padding-top: 0; }
.table tbody th { font-weight: 600; width: 27%; }
.table td.st { width: 16%; }
.table tbody tr:last-child > * { border-bottom: 1px solid var(--rule-on-paper); }
.table td:last-child, .table th:last-child { padding-right: 0; }
@media (max-width: 760px) {
  .table.stacked thead { display: none; }
  .table.stacked tr { display: block; padding: 14px 0; border-top: 1px solid var(--rule-on-paper); }
  .table.stacked tbody tr:last-child { border-bottom: 1px solid var(--rule-on-paper); }
  .table.stacked th, .table.stacked td { display: block; border: 0 !important; padding: 2px 0; width: auto; }
}

/* ---------------------------------------------------------- doc pages -- */
.page-head { padding-top: calc(var(--nav-h) + clamp(52px, 8vw, 120px)); padding-bottom: clamp(52px, 7vw, 104px); }
.page-head .title { grid-column: 1 / span 10; margin-top: 20px; }
.page-head .lead { grid-column: 1 / span 6; margin-top: 28px; color: var(--mute-on-ink); }
@media (max-width: 900px) { .page-head .title, .page-head .lead { grid-column: 1 / -1; } }
.doc { padding-block: clamp(48px, 6vw, 96px) var(--section); }
.toc { grid-column: 1 / span 3; align-self: start; position: sticky; top: 92px; }
.toc ol { counter-reset: toc; margin-top: 14px; }
.toc li { counter-increment: toc; border-top: 1px solid var(--rule-on-paper); }
.toc li:last-child { border-bottom: 1px solid var(--rule-on-paper); }
.toc a { display: grid; grid-template-columns: 2.4em 1fr; padding: 8px 0; text-decoration: none; font-size: var(--t-small); line-height: 1.35; }
.toc a::before { content: counter(toc, decimal-leading-zero); font: 500 11px/1.9 var(--mono); color: var(--mute-on-paper); }
.toc a:hover { color: var(--signal-deep); }
.doc-body { grid-column: 4 / span 8; min-width: 0; }
@media (max-width: 1100px) { .doc-body { grid-column: 4 / -1; } }
@media (max-width: 900px) { .toc { position: static; grid-column: 1 / -1; margin-bottom: 40px; } .doc-body { grid-column: 1 / -1; } }
.doc-body > section { padding-block: 0 clamp(56px, 6vw, 88px); }
.doc-body > section + section { padding-top: clamp(28px, 3vw, 40px); border-top: 1px solid var(--rule-on-paper); }
.doc-body h2 { font-size: clamp(28px, 2.8vw, 42px); font-weight: 600; letter-spacing: -0.03em; line-height: 1.04; margin: 12px 0 22px; }
.doc-body h3 { font-size: var(--t-h3); font-weight: 600; letter-spacing: -0.012em; margin: 34px 0 10px; }
.doc-body p, .doc-body ul, .doc-body ol, .doc-body .table-scroll, .doc-body pre, .doc-body form { margin-bottom: 16px; }
.doc-body .measure { max-width: 42em; }
.bullets > li, .numbered > li { position: relative; padding-left: 1.7em; margin: 8px 0; }
.bullets > li::before { content: ""; position: absolute; left: 0.15em; top: 0.75em; width: 9px; height: 1px; background: currentColor; }
.numbered { counter-reset: n; }
.numbered > li { counter-increment: n; }
.numbered > li::before { content: counter(n, decimal-leading-zero); position: absolute; left: 0; top: 0.32em; font: 500 11px/1.5 var(--mono); color: var(--mute-on-paper); }
.doc-body pre { padding: 16px 18px; background: var(--ink); color: var(--text-on-ink); border-radius: 2px; overflow-x: auto; font-size: 13px; line-height: 1.65; }
.expect { border-left: 2px solid var(--signal-deep); padding: 2px 0 2px 16px; margin: 0 0 20px; font-size: var(--t-small); }
.expect::before { content: "Expected"; display: block; font: 600 11px/1.7 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; color: var(--signal-deep); }
.note { border-left: 2px solid var(--partial); padding: 2px 0 2px 16px; margin: 0 0 20px; }
.note-label { display: block; font: 600 11px/1.7 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; color: var(--partial); }
.cross > li { position: relative; padding-left: 1.7em; margin: 8px 0; }
.cross > li::before { content: "\00d7"; position: absolute; left: 0.1em; top: -0.04em; font-weight: 600; color: var(--none); }
.ink .cross > li::before { color: var(--none-on-ink); }

/* --------------------------------------------------------------- forms -- */
.form { display: grid; gap: 26px; }
.field label { display: block; font-weight: 600; margin-bottom: 4px; }
.field .hint { font-size: var(--t-small); color: var(--mute-on-paper); margin-bottom: 8px; }
.field .optional { font-weight: 400; color: var(--mute-on-paper); }
.field input, .field select, .field textarea {
  width: 100%; font: inherit; color: var(--text-on-paper); background: var(--white);
  border: 1px solid var(--rule-on-paper); border-radius: 2px; padding: 11px 12px; min-height: 46px;
  transition: border-color var(--fast) var(--ease);
}
.field input:hover, .field select:hover, .field textarea:hover { border-color: rgba(11, 12, 13, 0.42); }
.field input:focus-visible, .field select:focus-visible, .field textarea:focus-visible { outline: 2px solid var(--signal-deep); outline-offset: 0; border-color: var(--signal-deep); }
.field textarea { min-height: 110px; resize: vertical; }
.field textarea.code { font-family: var(--mono); font-size: 13.5px; }
.field-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 760px) { .field-row { grid-template-columns: 1fr; } }
.field .sub-label { margin-top: 14px; font-weight: 500; }
.field .check-label { display: flex; gap: 10px; align-items: baseline; font-weight: 500; }
.field .check-label input { width: auto; min-height: 0; accent-color: var(--signal-deep); }
.usage-preview { margin-top: 10px; padding: 12px; background: var(--white); border-left: 2px solid var(--signal-deep);
  font: 13px/1.5 var(--mono); white-space: pre-wrap; }
/* Technical details are one click away, so the four questions come first. */
.more { border-top: 1px solid var(--rule-on-paper); border-bottom: 1px solid var(--rule-on-paper); }
.more > summary { cursor: pointer; padding: 14px 0; font-weight: 600; list-style-position: inside; }
.more[open] > summary { margin-bottom: 8px; }
.more > .field, .more > .field-row { margin-bottom: 22px; }
.address-line { font-size: var(--t-small); color: var(--mute-on-paper); }
.address-line a { color: var(--text-on-paper); font-weight: 600; }
.address-line .btn { margin-left: 6px; vertical-align: middle; }
.status-line { min-height: 1.5em; font-size: var(--t-small); }
.status-line.ok { color: var(--signal-deep); }
.status-line.err { color: var(--none); }

/* --------------------------------------------------------------- footer -- */
.site-footer { background: var(--ink); color: var(--text-on-ink); color-scheme: dark; padding-top: var(--section); overflow: hidden;
  border-top: 1px solid var(--rule-on-ink); }
.site-footer .cols { row-gap: 36px; }
.site-footer .about { grid-column: 1 / span 5; color: var(--mute-on-ink); font-size: var(--t-small); }
.site-footer .about p + p { margin-top: 12px; }
.site-footer .about strong { color: var(--text-on-ink); font-weight: 500; }
.site-footer nav { grid-column: 8 / span 2; }
.site-footer nav + nav { grid-column: 10 / span 3; }
.site-footer nav ul { margin-top: 12px; }
.site-footer nav li a { display: inline-block; padding: 5px 0; text-decoration: none; font-size: var(--t-small); }
.site-footer nav li a:hover { color: var(--signal); }
@media (max-width: 900px) { .site-footer .about { grid-column: 1 / -1; } .site-footer nav, .site-footer nav + nav { grid-column: span 3; } }
/* The logo once more, large, closing the page (decorative: the navbar carries its name). */
.wordmark { margin-top: clamp(64px, 9vw, 140px); padding: 0 var(--margin) clamp(36px, 5vw, 72px); user-select: none; }
.wordmark img { display: block; width: clamp(220px, 40vw, 540px); height: auto; }

/* -------------------------------------------------------------- motion -- */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes settle { from { opacity: 0.2; } to { opacity: 1; } }
.js .hero .display .line, .js .hero .intro, .js .hero .facts, .js .hero-shot { animation: rise var(--slow) var(--ease) both; }
.js .hero .display .line:nth-child(2) { animation-delay: 70ms; }
.js .hero .intro { animation-delay: 140ms; }
.js .hero .facts { animation-delay: 200ms; }
.js .hero-shot { animation-delay: 260ms; }
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--slow) var(--ease), transform var(--slow) var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------- print -- */
@media print {
  .site-header, .wordmark, .actions, .menu { display: none !important; }
  .ink { background: #fff; color: #000; }
}

/* ------------------------------------------------- home: section parts -- */
.where { margin-top: clamp(56px, 7vw, 112px); }
.where-list .label { margin-top: 4px; }
.env { margin-top: clamp(48px, 6vw, 88px); }
.env-table { margin-top: clamp(48px, 6vw, 88px); }
.env-table .h3 { font-size: 18px; }
.env-table p { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline; }
.samples-lead { margin-top: 24px; }
.capabilities-legend { margin: 36px 0 28px; }
.capabilities-table { margin-bottom: 36px; }
.limits { margin-top: clamp(48px, 6vw, 88px); row-gap: 48px; }
.col-limits { grid-column: 4 / span 5; }
.col-prereq { grid-column: 10 / -1; }
.prereq { margin-top: 14px; }
.prereq > div { padding: 14px 0 16px; border-top: 1px solid var(--rule-on-ink); }
.prereq > div:last-child { border-bottom: 1px solid var(--rule-on-ink); }
.prereq dt { font-weight: 600; }
.prereq dd { margin-top: 4px; font-size: var(--t-small); color: var(--mute-on-ink); }
@media (max-width: 1100px) { .col-limits { grid-column: 4 / -1; } .col-prereq { grid-column: 4 / -1; } }
@media (max-width: 900px) { .col-limits, .col-prereq { grid-column: 1 / -1; } }
.start-list { margin-top: clamp(40px, 5vw, 72px); }
.start-list .h3 a { text-decoration-thickness: 1px; }
.start-cta { margin-top: 36px; }
.beta-title { font-size: clamp(42px, 6.4vw, 104px); }
.beta-lead { margin-top: 28px; }
.beta-actions { margin-top: 32px; }
.beta-notes { margin-top: clamp(64px, 8vw, 120px); }
.beta-notes .label { margin-bottom: 10px; }
/* Two ink sections in a row share one gap, not two. */
#environment { padding-bottom: calc(var(--section) * 0.6); }
#samples { padding-top: calc(var(--section) * 0.6); }
#beta { padding-bottom: calc(var(--section) * 0.7); }
.site-footer { padding-top: clamp(64px, 7vw, 112px); }
.legend-list { margin: 14px 0 28px; }
.legend-list li { display: grid; grid-template-columns: 11em minmax(0, 1fr); gap: 16px; padding: 9px 0; border-top: 1px solid var(--rule-on-paper); align-items: baseline; }
.legend-list li:last-child { border-bottom: 1px solid var(--rule-on-paper); }
@media (max-width: 560px) { .legend-list li { grid-template-columns: 1fr; gap: 2px; } }
.fill-hint { margin: 8px 0 0; }
.doc-body > .note { margin-bottom: 32px; }
.after { margin-top: clamp(56px, 6vw, 88px); padding-top: 32px; border-top: 1px solid var(--rule-on-paper); }
/* A capture links to its full-resolution image: on a phone the interface is
   readable there, at the cost of one tap, rather than shrunk past reading. */
.enlarge { display: block; text-decoration: none; }
.enlarge::after { content: "Open full size \2197"; display: none; margin-top: 10px; font: 600 11px/1.6 var(--mono);
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--signal-deep); }
.ink .enlarge::after { color: var(--signal); }
@media (max-width: 700px) { .enlarge::after { display: block; } }