:root {
  color-scheme: dark;
  --ink: oklch(92% 0.015 82);
  --muted: oklch(68% 0.018 82);
  --faint: oklch(49% 0.014 82);
  --base: oklch(19% 0.012 82);
  --surface: oklch(23% 0.014 82);
  --raised: oklch(27% 0.016 82);
  --line: oklch(38% 0.018 82 / 0.65);
  --amber: oklch(78% 0.14 76);
  --green: oklch(77% 0.13 145);
  --red: oklch(70% 0.17 28);
  --blue: oklch(74% 0.09 235);
  --sans: "Instrument Sans", "Avenir Next", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 7rem; }
body {
  margin: 0;
  background: var(--base);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; }
a { color: inherit; }
code, pre { font-family: var(--mono); }
code { font-size: 0.88em; color: oklch(88% 0.055 78); }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.6rem;
  left: 0.6rem;
  padding: 0.55rem 0.8rem;
  background: var(--amber);
  color: var(--base);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.masthead {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: oklch(19% 0.012 82 / 0.94);
  padding: 0 2rem;
  backdrop-filter: blur(16px);
}
.identity { display: flex; align-items: center; gap: 0.8rem; text-decoration: none; }
.identity .mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  background: var(--amber);
  color: var(--base);
  font: 500 0.78rem/1 var(--mono);
}
.identity > span:last-child { display: grid; line-height: 1.2; }
.identity strong { font-size: 0.88rem; letter-spacing: 0.01em; }
.identity small { color: var(--muted); font-size: 0.72rem; }
.masthead nav { display: flex; align-items: center; gap: 1.5rem; }
.masthead nav a { color: var(--muted); font-size: 0.78rem; text-decoration: none; }
.masthead nav a:hover { color: var(--ink); }
.masthead .console-link { border: 1px solid var(--line); padding: 0.55rem 0.75rem; color: var(--ink); }

.page-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 820px);
  gap: clamp(3rem, 7vw, 8rem);
  justify-content: center;
  padding: 0 clamp(1.5rem, 5vw, 5rem);
}
.contents {
  position: sticky;
  top: 104px;
  align-self: start;
  display: grid;
  padding-top: 4.5rem;
}
.contents > p {
  margin: 0 0 0.75rem;
  color: var(--faint);
  font: 500 0.65rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.contents > a {
  border-left: 1px solid var(--line);
  color: var(--muted);
  padding: 0.33rem 0 0.33rem 1rem;
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}
.contents > a:hover, .contents > a.active { border-left-color: var(--amber); color: var(--ink); }
.contents-meta {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.25rem 0.75rem;
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  font-size: 0.68rem;
}
.contents-meta span { color: var(--faint); }
.contents-meta strong { font: 400 0.68rem/1.65 var(--mono); color: var(--muted); }

main { min-width: 0; }
.doc-section { padding: clamp(5rem, 9vw, 8rem) 0; border-bottom: 1px solid var(--line); }
.intro { min-height: calc(100vh - 72px); display: flex; flex-direction: column; justify-content: center; }
.kicker {
  margin: 0 0 0.8rem;
  color: var(--amber);
  font: 500 0.68rem/1.2 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
h1, h2, h3, p { text-wrap: pretty; }
h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(3.6rem, 8.7vw, 7.7rem);
  font-stretch: 78%;
  font-weight: 520;
  letter-spacing: -0.065em;
  line-height: 0.86;
}
.lede { max-width: 670px; margin: 2.4rem 0 0; color: var(--muted); font-size: clamp(1.08rem, 2vw, 1.32rem); line-height: 1.55; }
.contract-line {
  display: grid;
  grid-template-columns: 1fr 38px 1fr;
  align-items: center;
  gap: 1rem;
  margin-top: clamp(3rem, 8vh, 6rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.2rem 0;
}
.contract-line span:not(.pulse) { display: grid; }
.contract-line small { color: var(--faint); font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.08em; }
.contract-line code { font-size: 0.86rem; }
.pulse { position: relative; height: 1px; background: var(--line); }
.pulse::after { content: ""; position: absolute; width: 5px; height: 5px; top: -2px; left: 0; border-radius: 50%; background: var(--amber); animation: travel 2.8s var(--ease) infinite; }
@keyframes travel { 0% { transform: translateX(0); opacity: 0; } 12% { opacity: 1; } 88% { opacity: 1; } 100% { transform: translateX(34px); opacity: 0; } }

.section-heading { display: flex; align-items: flex-start; gap: 1.3rem; margin-bottom: 2.5rem; }
.section-heading > span { padding-top: 0.55rem; color: var(--faint); font: 400 0.7rem/1 var(--mono); }
.section-heading .kicker { margin-bottom: 0.2rem; }
h2 { margin: 0; font-size: clamp(2.4rem, 5vw, 4.4rem); font-stretch: 78%; font-weight: 540; letter-spacing: -0.045em; line-height: 1; }
h3 { margin: 0; font-size: 0.82rem; font-weight: 600; letter-spacing: 0.01em; }
.doc-section > p { max-width: 680px; color: var(--muted); }

.steps { list-style: none; margin: 0 0 3rem; padding: 0; counter-reset: step; }
.steps li { display: grid; grid-template-columns: minmax(150px, 0.45fr) 1fr; gap: 2rem; border-top: 1px solid var(--line); padding: 1.1rem 0; }
.steps strong { font-size: 0.9rem; font-weight: 550; }
.steps span { color: var(--muted); font-size: 0.88rem; }
.steps code { font-size: 0.78rem; }

.code-block, .endpoint, .command-spec { border: 1px solid var(--line); background: var(--surface); }
.code-bar { display: flex; justify-content: space-between; border-bottom: 1px solid var(--line); padding: 0.65rem 0.85rem; color: var(--faint); font: 400 0.68rem/1.4 var(--mono); }
.code-bar button, .runner-output header button { border: 0; background: none; color: var(--muted); cursor: pointer; font: inherit; }
.code-bar button:hover, .runner-output header button:hover { color: var(--amber); }
pre { margin: 0; overflow: auto; color: oklch(81% 0.025 82); font-size: 0.76rem; line-height: 1.75; tab-size: 2; }
.code-block > pre { max-height: 540px; padding: 1.4rem; }

.endpoint { margin-top: 1rem; }
.endpoint > header { display: grid; grid-template-columns: auto auto 1fr; gap: 0.8rem; align-items: center; padding: 0.85rem; }
.endpoint > header > span { justify-self: end; color: var(--muted); font-size: 0.78rem; }
.method { min-width: 46px; padding: 0.15rem 0.35rem; text-align: center; font: 500 0.62rem/1.5 var(--mono); color: var(--base); }
.method.post { background: var(--amber); }
.method.get { background: var(--blue); }
.endpoint-body { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
.endpoint-body > div { min-width: 0; padding: 1rem; }
.endpoint-body > div + div { border-left: 1px solid var(--line); }
.endpoint-body h3 { margin-bottom: 0.8rem; color: var(--muted); }
.endpoint-note { border-top: 1px solid var(--line); padding: 0.8rem 1rem; color: var(--muted); font-size: 0.78rem; }

.split-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.split-copy p { color: var(--muted); font-size: 0.88rem; }
.split-copy pre { border-left: 1px solid var(--line); padding-left: 1rem; }
.event-spec { display: grid; grid-template-columns: 70px 180px 1fr; align-items: center; border-top: 1px solid var(--line); padding: 1rem 0; }
.event-spec > span { color: var(--amber); font: 500 0.65rem/1 var(--mono); text-transform: uppercase; }
.event-spec > p { margin: 0; color: var(--muted); font-size: 0.82rem; }
.event-spec.response > span { color: var(--green); }

.reference-table { border-top: 1px solid var(--line); }
.reference-table > div { display: grid; grid-template-columns: 150px 1fr 210px; gap: 1.2rem; align-items: start; border-bottom: 1px solid var(--line); padding: 1rem 0; font-size: 0.8rem; }
.reference-table > div > span { color: var(--muted); }
.reference-table .table-head { color: var(--faint); font: 500 0.62rem/1 var(--mono); letter-spacing: 0.09em; text-transform: uppercase; }
.callout { display: grid; grid-template-columns: 100px 1fr; gap: 1rem; margin-top: 2rem; background: oklch(78% 0.14 76 / 0.08); padding: 1rem; font-size: 0.82rem; }
.callout strong { color: var(--amber); font: 500 0.66rem/1.8 var(--mono); text-transform: uppercase; }
.callout p { margin: 0; color: var(--muted); }

.command-spec header { display: flex; gap: 2rem; align-items: center; border-bottom: 1px solid var(--line); padding: 1rem; }
.command-spec.secondary-spec { margin-top: 1rem; }
.command-spec header span { color: var(--muted); font-size: 0.82rem; }
.command-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; }
.command-grid > div { padding: 1.2rem; min-width: 0; }
.command-grid > div + div { border-left: 1px solid var(--line); }
.command-grid h3 { margin-bottom: 1rem; color: var(--muted); }
.command-grid p { margin: 0.8rem 0 0; color: var(--muted); font-size: 0.76rem; }
dl { margin: 0; }
dt { margin-top: 0.8rem; }
dd { margin: 0.15rem 0 0; color: var(--muted); font-size: 0.78rem; }

details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { display: flex; gap: 1rem; align-items: center; padding: 1rem 0; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; margin-left: auto; color: var(--faint); font: 400 1rem/1 var(--mono); }
details[open] summary::after { content: "−"; }
summary span { color: var(--muted); font-size: 0.78rem; }
details > pre { padding: 0 0 1.5rem 1.5rem; border-left: 1px solid var(--line); }

.runner-section { border-bottom: 0; }
.runner { display: grid; grid-template-columns: minmax(300px, 0.86fr) minmax(320px, 1.14fr); margin-top: 2rem; border: 1px solid var(--line); background: var(--surface); }
.runner-form { padding: 1.25rem; }
.runner label { display: block; margin: 0.85rem 0 0.28rem; color: var(--muted); font-size: 0.7rem; }
.runner input, .runner textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0;
  outline: none;
  background: var(--base);
  color: var(--ink);
  padding: 0.68rem 0.72rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  transition: border-color 150ms ease;
}
.runner input:focus, .runner textarea:focus { border-color: var(--amber); }
.runner textarea { resize: vertical; line-height: 1.6; }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; align-items: end; }
.action {
  width: 100%;
  margin-top: 0.85rem;
  border: 0;
  background: var(--amber);
  color: var(--base);
  padding: 0.72rem 1rem;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 650;
}
.action.secondary { border: 1px solid var(--line); background: var(--raised); color: var(--ink); }
.action:hover:not(:disabled) { filter: brightness(1.08); }
.action:disabled { cursor: not-allowed; opacity: 0.45; }
.divider { display: flex; align-items: center; gap: 0.75rem; margin: 1.7rem 0 0.3rem; color: var(--faint); font: 400 0.59rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.divider::before, .divider::after { content: ""; height: 1px; flex: 1; background: var(--line); }
.runner-output { min-width: 0; border-left: 1px solid var(--line); background: var(--base); }
.runner-output header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); padding: 0.8rem 1rem; }
.runner-output header > div { display: flex; align-items: center; gap: 0.6rem; }
#runner-light { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); transition: background 180ms ease, box-shadow 180ms ease; }
#runner-light.connected { background: var(--green); box-shadow: 0 0 0 3px oklch(77% 0.13 145 / 0.12); }
.runner-output header button { font-size: 0.68rem; }
#runner-events { display: flex; flex-direction: column-reverse; max-height: 745px; min-height: 520px; margin: 0; overflow: auto; padding: 0; list-style: none; }
#runner-events li { display: grid; grid-template-columns: 62px minmax(0, 1fr); gap: 0.75rem; border-top: 1px solid var(--line); padding: 0.85rem 1rem; }
#runner-events li:first-child { border-top: 0; }
#runner-events time { color: var(--faint); font: 400 0.59rem/1.6 var(--mono); }
#runner-events strong { display: block; color: var(--muted); font: 500 0.68rem/1.5 var(--mono); }
#runner-events pre { margin-top: 0.35rem; max-height: 210px; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--faint); font-size: 0.66rem; line-height: 1.55; }
#runner-events .success strong { color: var(--green); }
#runner-events .error strong { color: var(--red); }
#runner-events .outbound strong { color: var(--amber); }

footer { display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding: 1.3rem 2rem; color: var(--faint); font-size: 0.7rem; }
.toast { position: fixed; z-index: 30; right: 1.2rem; bottom: 1.2rem; max-width: min(360px, calc(100vw - 2.4rem)); background: var(--ink); color: var(--base); padding: 0.75rem 1rem; font-size: 0.76rem; transform: translateY(140%); opacity: 0; transition: transform 280ms var(--ease), opacity 180ms ease; }
.toast.visible { transform: translateY(0); opacity: 1; }

@media (max-width: 880px) {
  .page-grid { grid-template-columns: minmax(0, 1fr); }
  .contents { display: none; }
  .intro { min-height: auto; padding-top: 7rem; }
  .runner { grid-template-columns: 1fr; }
  .runner-output { border-top: 1px solid var(--line); border-left: 0; }
  #runner-events { min-height: 380px; }
}

@media (max-width: 620px) {
  .masthead { padding: 0 1rem; }
  .identity small, .masthead nav > a:first-child { display: none; }
  .masthead nav { gap: 0; }
  .page-grid { padding: 0 1rem; }
  h1 { font-size: clamp(3.2rem, 16vw, 5rem); }
  .contract-line { grid-template-columns: 1fr; gap: 0.65rem; }
  .pulse { display: none; }
  .steps li, .split-copy, .endpoint-body, .command-grid, .field-pair { grid-template-columns: 1fr; gap: 0.4rem; }
  .endpoint-body > div + div, .command-grid > div + div { border-top: 1px solid var(--line); border-left: 0; }
  .endpoint > header { grid-template-columns: auto 1fr; }
  .endpoint > header > span { grid-column: 1 / -1; justify-self: start; }
  .event-spec { grid-template-columns: 62px 1fr; }
  .event-spec p { grid-column: 1 / -1; }
  .reference-table > div { grid-template-columns: 1fr; gap: 0.3rem; }
  .reference-table .table-head { display: none; }
  .callout { grid-template-columns: 1fr; gap: 0.25rem; }
  footer { display: grid; gap: 0.2rem; padding: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}