:root {
  --paper: #ffffff;
  --paper-bright: #ffffff;
  --ink: #050505;
  --ink-soft: #292929;
  --line: #c9d2ea;
  --line-dark: #3f4658;
  --blue: #2456f5;
  --blue-dark: #1739a6;
  --acid: #d9ff45;
  --system: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: var(--system);
  --sans: var(--system);
  --display: var(--system);
  --page: min(1420px, calc(100vw - 64px));
  --radius: 18px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 4px; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  width: var(--page);
  min-height: 84px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--blue);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.035em;
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--blue);
  color: white;
  font-family: var(--display);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -7px;
  line-height: 1;
}
.brand-mark span { color: var(--acid); }

nav { display: flex; align-items: center; gap: 30px; }
nav a { font-size: .84rem; font-weight: 700; text-decoration: none; }
nav a:hover { color: var(--blue); text-decoration: underline; }
.nav-github { padding-left: 30px; border-left: 1px solid var(--line); }

.hero {
  width: var(--page);
  min-height: 710px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: .84fr 1.16fr;
  align-items: center;
  gap: clamp(40px, 6vw, 110px);
  padding: 88px 0 90px;
  background-image:
    linear-gradient(rgba(36,86,245,.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36,86,245,.075) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: -1px -1px;
}

.hero-copy {
  position: relative;
  z-index: 1;
  padding: 28px 0;
  background: var(--paper);
  box-shadow: 28px 0 0 var(--paper), -28px 0 0 var(--paper);
}

.eyebrow, .kicker {
  margin: 0 0 19px;
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.eyebrow { display: flex; align-items: center; gap: 9px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 3px rgba(36,86,245,.16); }

h1, h2, h3, p { margin-top: 0; }
h1, h2 {
  font-family: var(--display);
  font-weight: 850;
  letter-spacing: -.075em;
  line-height: .9;
}
h1 {
  margin-bottom: 28px;
  font-family: var(--system);
  font-size: clamp(3.8rem, 6.5vw, 6.75rem);
  font-stretch: normal;
  font-weight: 800;
  letter-spacing: normal;
  line-height: .98;
}
h1 em { color: var(--blue); font-style: normal; }
h2 {
  margin-bottom: 0;
  font-family: var(--system);
  font-size: clamp(3.25rem, 6.2vw, 6.6rem);
  font-stretch: normal;
  font-weight: 800;
  letter-spacing: normal;
  line-height: .98;
}
h3 { margin-bottom: 0; font-size: 1.1rem; line-height: 1.2; letter-spacing: -.03em; }

.hero-pronunciation { margin: 0 0 16px; color: var(--ink-soft); font-size: .95rem; }
.hero-lede {
  max-width: 570px;
  margin-bottom: 30px;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 1.55vw, 1.35rem);
  line-height: 1.5;
}

.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  font-size: .86rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--blue); color: white; border-color: var(--blue); }
.button-primary:hover { background: var(--ink); border-color: var(--ink); }
.button-secondary { border-color: var(--blue); background: var(--paper-bright); color: var(--blue); }
.button-secondary:hover { background: var(--blue); color: white; }
.button-secondary:hover span { color: var(--acid); }
.hero-note { margin: 18px 0 0; color: #5f6470; font-size: .75rem; }

.hero-demo {
  border: 1px solid var(--ink);
  background: var(--paper-bright);
  box-shadow: 12px 12px 0 var(--ink);
}
.demo-toolbar, .demo-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 15px;
  font-family: var(--mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .03em;
  text-transform: uppercase;
}
.demo-toolbar { border-bottom: 1px solid var(--ink); }
.demo-format { color: #626774; }
.compare {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background: white;
  isolation: isolate;
}
.compare-source, .compare-result, .compare-result img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.compare-result { clip-path: inset(0 0 0 var(--split)); background: #edf2ff; }
.compare-rule { position: absolute; z-index: 3; top: 0; bottom: 0; left: var(--split); width: 2px; background: var(--blue); transform: translateX(-1px); }
.compare-rule span { position: absolute; top: 50%; left: 50%; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: var(--blue); color: white; transform: translate(-50%,-50%); font-weight: 900; box-shadow: 0 0 0 4px rgba(255,255,255,.9); }
.compare-slider { position: absolute; z-index: 4; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: col-resize; }
.compare-label { position: absolute; z-index: 2; bottom: 14px; padding: 6px 8px; background: rgba(5,5,5,.9); color: white; font-family: var(--mono); font-size: .61rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.compare-label-left { left: 14px; }
.compare-label-right { right: 14px; background: var(--blue); }
.demo-footer { border-top: 1px solid var(--ink); justify-content: flex-start; gap: 18px; color: #555b68; }
.demo-footer i { display: inline-block; margin-right: 6px; vertical-align: -1px; }
.legend-square { width: 9px; height: 9px; border: 1px solid var(--ink); background: white; }
.legend-node { width: 9px; height: 9px; background: var(--blue); }
.demo-deterministic { margin-left: auto; color: var(--ink); }

.proof {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--ink);
  color: white;
}
.proof div { min-height: 132px; padding: 25px clamp(20px, 3vw, 50px); display: flex; flex-direction: column; justify-content: center; border-right: 1px solid var(--line-dark); }
.proof div:last-child { border-right: 0; }
.proof strong { font-family: var(--display); font-size: clamp(2.1rem, 3.6vw, 4.2rem); letter-spacing: -.055em; line-height: 1; }
.proof span { margin-top: 7px; color: #c5c9d4; font-family: var(--mono); font-size: .65rem; text-transform: uppercase; }

.section { padding: 120px max(32px, calc((100vw - 1420px) / 2)); }
.section-heading { display: grid; grid-template-columns: 1.15fr .85fr; gap: 80px; align-items: end; margin-bottom: 62px; }
.section-heading > p { max-width: 610px; margin: 0; color: #5b606c; font-size: 1.03rem; }
.kicker { margin-bottom: 18px; color: var(--blue); }

.filter-bar { display: flex; gap: 8px; margin-bottom: 24px; }
.filter-button {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: transparent;
  color: var(--ink-soft);
  font-size: .76rem;
  font-weight: 750;
  cursor: pointer;
}
.filter-button:hover, .filter-button.is-active { border-color: var(--blue); background: var(--blue); color: white; }

.example-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.example-card { min-width: 0; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--paper-bright); }
.example-card[hidden] { display: none; }
.example-media { position: relative; aspect-ratio: 1; overflow: hidden; background: white; border-bottom: 1px solid var(--line); }
.example-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; transition: opacity .2s ease, transform .3s ease; }
.example-media .source-image { opacity: 0; }
.example-media[data-view="source"] .source-image { opacity: 1; }
.example-media[data-view="source"] .trace-image { opacity: 0; }
.example-card:hover .example-media img { transform: scale(1.035); }
.example-meta { min-height: 96px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px; }
.example-kind { display: block; margin-bottom: 5px; color: #626774; font-family: var(--mono); font-size: .59rem; font-weight: 700; text-transform: uppercase; }
.view-toggle { display: flex; flex-shrink: 0; border: 1px solid var(--line); border-radius: 99px; padding: 2px; }
.view-toggle button { padding: 5px 7px; border: 0; border-radius: 99px; background: transparent; color: #626774; font-size: .61rem; font-weight: 800; cursor: pointer; }
.view-toggle button.is-active { background: var(--blue); color: white; }

.pipeline { background: var(--ink); color: white; }
.section-heading-light > p { color: #b7bdca; }
.section-heading-light .kicker { color: var(--acid); }
.pipeline-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line-dark); }
.pipeline-list li { display: grid; grid-template-columns: 90px 1fr; align-items: start; gap: 20px; padding: 30px 0; border-bottom: 1px solid var(--line-dark); }
.pipeline-list li > span { color: var(--acid); font-family: var(--mono); font-size: .7rem; }
.pipeline-list li > div { display: grid; grid-template-columns: .45fr 1fr; gap: 50px; }
.pipeline-list h3 { font-family: var(--display); font-size: clamp(2rem, 4vw, 4rem); letter-spacing: -.05em; }
.pipeline-list p { max-width: 590px; margin: 5px 0 0; color: #b7bdca; }

.contract { display: grid; grid-template-columns: .85fr 1.15fr; gap: clamp(50px, 8vw, 140px); align-items: center; }
.contract-copy h2 { margin-bottom: 30px; }
.contract-copy > p:not(.kicker) { max-width: 630px; color: #555b68; font-size: 1.04rem; }
.contract-copy a { color: var(--blue); font-weight: 700; }
.check-list { margin: 30px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.check-list li { padding: 12px 0 12px 26px; border-bottom: 1px solid var(--line); position: relative; font-size: .86rem; font-weight: 650; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--blue); font-weight: 900; }
.check-list code { font: inherit; }
.install code { font-family: var(--mono); font-size: .85em; }

.code-window { overflow: hidden; border: 1px solid var(--ink); background: #050505; color: #ffffff; box-shadow: 12px 12px 0 var(--blue); }
.code-title { min-height: 46px; display: flex; align-items: center; justify-content: space-between; padding: 0 16px; border-bottom: 1px solid #353a47; background: #101010; font-family: var(--mono); font-size: .68rem; }
.code-title span { display: flex; gap: 6px; }
.code-title i { width: 9px; height: 9px; border-radius: 50%; background: white; }
.code-title i:first-child { background: var(--blue); }
.code-title i:nth-child(2) { background: var(--acid); }
.code-title i:nth-child(3) { background: white; }
.code-title b { color: #aeb4c2; font-weight: 500; }
.code-window pre { margin: 0; padding: clamp(24px, 4vw, 48px); overflow: auto; font-family: var(--mono); font-size: clamp(.72rem, 1.25vw, .94rem); line-height: 1.8; }
.prompt, .string { color: var(--acid); }
.key { color: #8fb0ff; }
.muted { color: #7f8592; }

.matching { border-top: 1px solid var(--line); }
.matching-features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.matching-features article { padding: 30px 28px 30px 0; border-bottom: 1px solid var(--line); }
.matching-features article:nth-child(even) { padding-left: 28px; border-left: 1px solid var(--line); }
.matching-number { display: block; margin-bottom: 18px; color: var(--blue); font-size: .72rem; font-weight: 800; }
.matching h3 { font-size: 1.35rem; }
.matching-features p { max-width: 580px; margin: 14px 0 0; color: #555b68; }
.matching-workflow { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 60px; margin-top: 60px; }
.matching-workflow > div { min-width: 0; }
.matching-copy p { margin: 20px 0; color: #555b68; }
.matching-copy code { font: inherit; font-weight: 650; }
.matching-copy a { color: var(--blue); font-weight: 700; }
.matching-status { margin: 48px 0 0; padding: 20px 24px; border-left: 3px solid var(--blue); background: #f4f6fb; color: #555b68; font-size: .86rem; }
.matching-status strong { color: var(--ink); }

.companion {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  gap: clamp(50px, 8vw, 140px);
  border-top: 1px solid var(--line);
  background: #f4f6fb;
}
.companion-copy h2 { max-width: 720px; margin-bottom: 28px; }
.companion-copy > p:not(.kicker) { max-width: 650px; color: #555b68; font-size: 1.04rem; }
.companion-copy .button { margin-top: 12px; }
.companion-card { border: 1px solid var(--ink); background: white; box-shadow: 12px 12px 0 var(--acid); }
.companion-card-title { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 20px; border-bottom: 1px solid var(--ink); }
.companion-card-title strong { font-size: .94rem; }
.companion-card-title span { color: var(--blue); font-family: var(--mono); font-size: .68rem; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
.companion-card ul { margin: 0; padding: 0 20px; list-style: none; }
.companion-card li { min-height: 57px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); }
.companion-card li span { color: #686e7a; font-family: var(--mono); font-size: .7rem; text-transform: uppercase; }
.companion-card li strong { font-size: .86rem; text-align: right; }
.companion-card > p { margin: 0; padding: 18px 20px 20px; color: #555b68; font-size: .78rem; }

.install { display: grid; grid-template-columns: .9fr 1.1fr; align-items: end; gap: 90px; border-top: 1px solid var(--ink); background: var(--blue); color: white; }
.install .kicker { color: var(--acid); }
.install > div, .install-action { min-width: 0; }
.install h2 { max-width: 700px; }
.install p:not(.kicker) { max-width: 650px; margin: 25px 0 0; color: #dbe3ff; }
.install-command { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-left: 18px; background: rgba(10,20,66,.48); border: 1px solid rgba(255,255,255,.35); }
.install-command code { min-width: 0; flex: 1; overflow: auto; white-space: nowrap; }
.install-command button { align-self: stretch; padding: 0 18px; border: 0; border-left: 1px solid rgba(255,255,255,.35); background: transparent; color: white; font-size: .74rem; font-weight: 800; cursor: pointer; }
.install-command button:hover { background: var(--acid); color: var(--ink); }
.install-links { display: flex; align-items: center; gap: 24px; margin-top: 18px; }
.install-links .button-primary { background: var(--acid); border-color: var(--acid); color: var(--ink); }
.install-links > a:not(.button) { color: white; font-size: .78rem; font-weight: 750; }

.product-footer { min-height: 180px; display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; gap: 30px; padding: 40px max(32px, calc((100vw - 1420px) / 2)); background: var(--ink); color: white; }
.footer-brand { color: white; }
.product-footer p { margin: 0; color: #aeb4c2; font-size: .78rem; text-align: center; }
.product-footer > div:last-child { display: flex; justify-content: flex-end; gap: 24px; }
.product-footer > div:last-child a { color: #d9deea; font-size: .76rem; font-weight: 700; }

.apcx-footer {
  position: relative;
  overflow: hidden;
  padding-bottom: 32px;
  background: #f7f7f9;
  color: #171719;
}
.apcx-footer-marquee {
  height: clamp(180px, 26vw, 360px);
  margin-bottom: 32px;
  font-weight: 400;
  pointer-events: none;
}
.apcx-footer-credit { padding: 0 max(32px, calc((100vw - 1420px) / 2)); }
.apcx-footer-credit p { margin: 0 0 4px; font-size: clamp(.875rem, 1.2vw, 1rem); font-weight: 700; line-height: 1.3; }
.apcx-footer-credit a { display: inline-flex; align-items: center; min-height: 44px; color: #60616d; font-size: .875rem; text-decoration: none; }
.apcx-footer-credit a:hover { text-decoration: underline; }

:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.install :focus-visible { outline-color: var(--acid); }

@media (max-width: 1080px) {
  :root { --page: calc(100vw - 40px); }
  .hero { grid-template-columns: 1fr 1fr; gap: 42px; min-height: 630px; padding: 68px 0 74px; }
  h1 { font-size: clamp(3.75rem, 6.5vw, 5.75rem); }
  .example-grid { grid-template-columns: repeat(2, 1fr); }
  .section, .install, .product-footer, .apcx-footer-credit { padding-left: 20px; padding-right: 20px; }
  .contract { gap: 54px; }
  nav { gap: 18px; }
  .nav-github { padding-left: 18px; }
}

@media (max-width: 760px) {
  :root { --page: calc(100vw - 28px); }
  .site-header { min-height: 70px; }
  nav a:not(.nav-github) { display: none; }
  .nav-github { padding-left: 0; border-left: 0; }
  .hero { grid-template-columns: 1fr; gap: 36px; padding: 58px 0 72px; }
  .hero-copy { padding-bottom: 0; }
  h1 { font-size: clamp(3.55rem, 13vw, 5.25rem); }
  .hero-demo { box-shadow: 7px 7px 0 var(--ink); }
  .demo-footer { gap: 10px; flex-wrap: wrap; }
  .demo-deterministic { width: 100%; margin-left: 0; }
  .proof { grid-template-columns: repeat(2, 1fr); }
  .proof div { min-height: 110px; border-bottom: 1px solid var(--line-dark); }
  .proof div:nth-child(2n) { border-right: 0; }
  .section { padding-top: 82px; padding-bottom: 82px; }
  .section-heading { grid-template-columns: 1fr; gap: 28px; margin-bottom: 42px; }
  h2 { font-size: clamp(3.5rem, 16vw, 5.2rem); }
  .example-grid { grid-template-columns: 1fr; }
  .pipeline-list li { grid-template-columns: 50px 1fr; }
  .pipeline-list li > div { grid-template-columns: 1fr; gap: 8px; }
  .contract, .companion, .install { grid-template-columns: 1fr; gap: 50px; }
  .matching-features, .matching-workflow { grid-template-columns: 1fr; }
  .matching-features article, .matching-features article:nth-child(even) { padding: 28px 0; border-left: 0; }
  .matching-workflow { gap: 36px; margin-top: 40px; }
  .code-window { box-shadow: 7px 7px 0 var(--blue); }
  .companion-card { box-shadow: 7px 7px 0 var(--acid); }
  .install-links { align-items: flex-start; flex-direction: column; gap: 15px; }
  .product-footer { grid-template-columns: 1fr; align-items: start; padding-top: 50px; padding-bottom: 50px; }
  .product-footer p { text-align: left; }
  .product-footer > div:last-child { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}