@font-face {
  font-family: "PromptCTX Display";
  src: url("assets/barlow-condensed-bold.ttf") format("truetype");
  font-display: swap;
  font-style: normal;
  font-weight: 700;
}

:root {
  --paper: #f3eee3;
  --paper-deep: #e5ddce;
  --ink: #181816;
  --ink-soft: #555149;
  --line: #aaa397;
  --signal: #1f66d1;
  --signal-dark: #144eaa;
  --signal-pale: #bed7ff;
  --white: #fffaf0;
  --display: "PromptCTX Display", "Avenir Next Condensed", "Arial Narrow", sans-serif;
  --body: "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
  --serif: "Iowan Old Style", "Baskerville", "Times New Roman", serif;
  --mono: "SFMono-Regular", "Cascadia Mono", "Liberation Mono", monospace;
  --page: min(1540px, calc(100% - 32px));
  --section-space: clamp(104px, 10vw, 164px);
  --focus: 3px solid var(--signal);
}

* { box-sizing: border-box; }

html {
  background: var(--paper);
  color: var(--ink);
  scroll-behavior: smooth;
  scrollbar-color: var(--signal) var(--paper-deep);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  caret-color: var(--signal);
}

::selection { background: var(--signal-pale); color: var(--ink); }
img { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: 5px; }
p, h1, h2, h3, figure, blockquote, dl, dd { margin: 0; }
button { font: inherit; }

.skip-link {
  position: fixed;
  z-index: 20;
  inset: 10px auto auto 10px;
  padding: 11px 15px;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: var(--focus); outline-offset: 4px; }

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: var(--page);
  min-height: 78px;
  margin-inline: auto;
  border-bottom: 1px solid var(--ink);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  width: max-content;
  min-height: 48px;
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.brand img { flex: 0 0 auto; }
.header-fact {
  font: 10px/1.4 var(--mono);
  letter-spacing: 0.09em;
  text-align: center;
  text-transform: uppercase;
}
.top-nav { display: flex; justify-content: flex-end; gap: 34px; }
.top-nav a {
  display: grid;
  place-items: center;
  min-height: 44px;
  font: 11px var(--mono);
  letter-spacing: 0.06em;
  text-decoration-thickness: 1px;
  text-transform: uppercase;
}
.top-nav a:hover { color: var(--signal-dark); }

.page-grid {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  width: var(--page);
  margin-inline: auto;
}
.provenance-rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: 36px 14px 28px 0;
  border-right: 1px solid var(--ink);
}
.provenance-rail::before {
  position: absolute;
  top: 88px;
  bottom: 40px;
  left: 18px;
  width: 1px;
  background: var(--signal);
  content: "";
}
.rail-title {
  color: var(--signal-dark);
  font: 11px/1.2 var(--mono);
  letter-spacing: 0.1em;
}
.rail-nav { display: grid; gap: clamp(4px, 1vh, 13px); margin-top: 31px; }
.rail-nav a {
  position: relative;
  display: grid;
  grid-template-columns: 38px 1fr;
  align-items: center;
  min-height: 44px;
  font: 10px var(--mono);
  text-decoration: none;
  text-transform: uppercase;
}
.rail-nav a::before {
  position: absolute;
  z-index: 1;
  left: 15px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--signal);
  background: var(--paper);
  content: "";
}
.rail-nav a:hover::before, .rail-nav a:focus-visible::before { background: var(--signal); }
.rail-nav a:active { color: var(--signal-dark); background: var(--signal-pale); }
.rail-nav span { color: var(--signal-dark); font-variant-numeric: tabular-nums; }
.rail-nav b { font-weight: 500; letter-spacing: 0.05em; }

.ledger { min-width: 0; }
.ledger-section { scroll-margin-top: 24px; }
.coordinate, .data-label {
  color: var(--signal-dark);
  font: 11px/1.35 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
h1, h2, h3 {
  font-family: var(--display);
  font-stretch: condensed;
  font-weight: 700;
  letter-spacing: -0.03em;
}
h1 { font-size: clamp(62px, 6.6vw, 96px); line-height: 0.85; text-transform: uppercase; }
h1 span { color: var(--signal-dark); }
h2 { font-size: clamp(48px, 5.8vw, 84px); line-height: 0.9; text-wrap: balance; }
h3 { font-size: clamp(38px, 4vw, 62px); line-height: 0.9; text-transform: uppercase; }

.opening {
  display: grid;
  grid-template-columns: minmax(390px, 0.93fr) minmax(520px, 1.07fr);
  min-height: calc(100svh - 78px);
  border-bottom: 1px solid var(--ink);
}
.opening-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 52px;
  padding: clamp(54px, 6vw, 92px) clamp(34px, 5vw, 78px) 48px;
}
.opening-copy > p { max-width: 31em; color: var(--ink-soft); font-size: clamp(18px, 1.6vw, 23px); }
.proof-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 330px);
  min-height: 52px;
  padding: 0 2px 0 14px;
  border-bottom: 2px solid var(--ink);
  font: 12px var(--mono);
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}
.proof-link span { display: grid; place-items: center; width: 44px; height: 44px; background: var(--signal); color: var(--white); }
.proof-link:hover { color: var(--signal-dark); border-color: var(--signal); }
.proof-link:active { background: var(--signal-pale); }
.opening-action > p { margin-top: 14px; color: var(--ink-soft); font-size: 14px; }

.live-model {
  position: relative;
  display: grid;
  grid-template-rows: auto auto auto 44px auto auto;
  align-content: center;
  gap: 0;
  min-width: 0;
  padding: 44px clamp(42px, 5vw, 78px);
  border-left: 1px solid var(--ink);
}
.live-model::before, .live-model::after {
  position: absolute;
  width: 26px;
  height: calc(100% - 108px);
  border-block: 2px solid var(--ink);
  content: "";
}
.live-model::before { top: 54px; left: 24px; border-left: 2px solid var(--ink); }
.live-model::after { right: 24px; bottom: 54px; border-right: 2px solid var(--ink); }
.model-head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 20px; border-bottom: 1px solid var(--ink); }
.model-head > div { display: grid; text-align: right; }
.model-head span { color: var(--signal-dark); font: 10px var(--mono); }
.model-head strong { font: 650 19px var(--body); }
.capture-fragment { padding: 32px 0 26px; }
.capture-fragment blockquote {
  margin-top: 13px;
  font: clamp(26px, 2.6vw, 39px)/1.18 var(--serif);
}
.capture-fragment blockquote span {
  background-color: var(--signal-pale);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.source-origin {
  position: relative;
  display: grid;
  grid-template-columns: 0.65fr 1.5fr 0.9fr;
  gap: 18px;
  padding: 17px 0 18px 22px;
  border-block: 1px solid var(--line);
  border-left: 1px solid var(--signal);
}
.source-origin p { min-width: 0; overflow-wrap: anywhere; font: 11px/1.45 var(--mono); }
.source-origin p span { display: block; margin-bottom: 5px; color: var(--ink-soft); font-size: 9px; }
.source-point { position: absolute; top: 20px; left: -4px; width: 7px; height: 7px; background: var(--signal); }
.model-route { position: relative; }
.model-route::before { position: absolute; top: 0; left: 46px; width: 1px; height: 30px; background: var(--signal); content: ""; }
.model-route span { position: absolute; top: 30px; left: 46px; width: calc(100% - 46px); height: 1px; background: var(--signal); }
.prompt-result { padding: 21px 18px; border: 1px solid var(--signal); }
.prompt-result p { max-width: 29em; margin-top: 8px; font-size: 15px; }
.model-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 22px; border-top: 1px solid var(--ink); }
.model-facts div { padding-top: 12px; }
.model-facts dt { color: var(--ink-soft); font: 9px var(--mono); text-transform: uppercase; }
.model-facts dd { margin-top: 4px; font: 11px var(--mono); }

.proof { padding: var(--section-space) clamp(34px, 5vw, 76px); }
.section-heading { display: grid; grid-template-columns: 0.45fr 1.35fr 0.7fr; gap: 34px; align-items: end; }
.section-heading > p:last-child { max-width: 34em; color: var(--ink-soft); }
.product-proof { margin-top: 70px; border-block: 1px solid var(--ink); }
.proof-labels { display: grid; grid-template-columns: 1fr 1.1fr 0.8fr; gap: 12px; padding: 13px 0; font: 9px var(--mono); letter-spacing: 0.06em; }
.proof-labels span:nth-child(2) { text-align: center; }
.proof-labels span:last-child { text-align: right; }
.app-frame { position: relative; padding: 13px 18px; border-inline: 1px solid var(--signal); background: var(--paper-deep); }
.app-frame::before, .app-frame::after { position: absolute; width: 44px; height: 16px; border-color: var(--signal); content: ""; }
.app-frame::before { top: -1px; left: -1px; border-top: 2px solid; border-left: 2px solid; }
.app-frame::after { right: -1px; bottom: -1px; border-right: 2px solid; border-bottom: 2px solid; }
.app-frame img { width: 100%; height: auto; aspect-ratio: 2240 / 1320; }
figcaption { display: flex; justify-content: space-between; gap: 20px; padding: 12px 0; color: var(--ink-soft); font: 10px var(--mono); }
figcaption span { color: var(--signal-dark); }

.mechanism { padding: var(--section-space) clamp(34px, 5vw, 76px); border-top: 1px solid var(--ink); }
.mechanism-heading { display: grid; grid-template-columns: 0.45fr 2fr; gap: 34px; align-items: start; }
.method-requirements { max-width: 40em; margin-top: 28px; color: var(--ink-soft); }
kbd { font: 0.85em var(--mono); }
.route-list { margin: 78px 0 0; padding: 0; border-top: 2px solid var(--ink); list-style: none; }
.route-list li {
  display: grid;
  grid-template-columns: 70px minmax(180px, 0.75fr) minmax(300px, 1.4fr) 145px;
  gap: clamp(20px, 3vw, 48px);
  align-items: start;
  padding: 32px 0 38px;
  border-bottom: 1px solid var(--line);
}
.route-number { color: var(--signal-dark); font: 12px var(--mono); }
.route-list p { max-width: 40em; color: var(--ink-soft); }
.route-state { justify-self: end; padding-top: 8px; color: var(--signal-dark); font: 9px var(--mono); letter-spacing: 0.07em; }

.composition-field { padding: var(--section-space) clamp(34px, 5vw, 76px); background: var(--signal); color: var(--white); }
.composition-field .coordinate, .composition-field .data-label { color: var(--white); }
.composition-field header { display: grid; grid-template-columns: 0.45fr 1.25fr 0.7fr; gap: 34px; align-items: end; }
.composition-field header > p:last-child { max-width: 33em; }
.assembly { margin-top: 72px; border-block: 2px solid var(--white); }
.assembly > div { position: relative; display: grid; grid-template-columns: 90px 1.3fr 0.7fr; gap: 30px; padding: 30px 0; border-bottom: 1px solid rgb(255 250 240 / 72%); }
.assembly > div:last-child { border-bottom: 0; }
.assembly-index { font: 700 58px/0.85 var(--display); }
.assembly blockquote { margin-top: 12px; font: clamp(23px, 2.4vw, 36px)/1.18 var(--serif); }
.assembly dl { align-self: end; font: 10px var(--mono); }
.assembly dl div { display: grid; grid-template-columns: 58px 1fr; gap: 10px; padding: 7px 0; border-top: 1px solid rgb(255 250 240 / 55%); }
.assembly dd { overflow-wrap: anywhere; }
.assembly-format { align-items: start; }
.assembly-format pre {
  grid-column: 2 / -1;
  margin: 0;
  padding: 24px 26px;
  overflow: auto;
  background: var(--ink);
  color: var(--white);
  font: 13px/1.7 var(--mono);
}
.assembly-output { align-items: end; }
.assembly-output > div:nth-child(2) p { max-width: 31em; margin-top: 12px; font-size: 19px; }
.budget { border-top: 1px solid var(--white); }
.budget > div { display: flex; justify-content: space-between; gap: 16px; padding-top: 10px; font: 10px var(--mono); }
.budget strong { font-size: 13px; font-variant-numeric: tabular-nums; }
.budget-track { display: block; height: 9px; margin-top: 17px; background: rgb(24 24 22 / 34%); }
.budget-track span { display: block; width: 52%; height: 100%; background: var(--white); }
.budget ol { display: flex; justify-content: space-between; margin: 7px 0 0; padding: 0; list-style: none; font: 8px var(--mono); }

.privacy { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: clamp(70px, 10vw, 160px); min-height: 720px; padding: var(--section-space) clamp(34px, 5vw, 76px); align-items: start; }
.privacy h2 { max-width: 760px; margin-top: 56px; font-size: clamp(64px, 8vw, 96px); }
.privacy-copy > p:last-child { max-width: 42em; margin-top: 34px; color: var(--ink-soft); font-size: 19px; }
.privacy-register { align-self: end; border-top: 2px solid var(--ink); }
.privacy-register div { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line); font: 10px var(--mono); }
.privacy-register dd { color: var(--signal-dark); text-align: right; }

.pricing {
  display: grid;
  grid-template-columns: 0.72fr 1fr 0.78fr;
  gap: clamp(34px, 5vw, 74px);
  padding: var(--section-space) clamp(34px, 5vw, 76px);
  border-top: 3px solid var(--ink);
}
.price-mark { color: var(--signal); font: 700 clamp(118px, 14vw, 190px)/0.68 var(--display); letter-spacing: -0.04em; }
.price-mark span { vertical-align: top; font-size: 0.34em; }
.price-copy h2 { margin-top: 44px; font-size: clamp(52px, 5.5vw, 78px); }
.price-copy > p:last-child { max-width: 37em; margin-top: 28px; color: var(--ink-soft); }
.purchase-panel { align-self: end; }
.installation-guidance { margin-block: 20px; border-block: 1px solid var(--line); }
.installation-guidance summary { padding-block: 12px; cursor: pointer; font-weight: 650; }
.installation-guidance summary:hover { color: var(--signal-dark); }
.installation-guidance p { padding-bottom: 16px; }
.availability { padding-bottom: 12px; border-bottom: 1px solid var(--ink); font: 9px var(--mono); letter-spacing: 0.06em; }
.availability span { display: inline-block; width: 7px; height: 7px; margin-right: 7px; background: var(--ink-soft); }
.buy-control {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 56px;
  margin-top: 20px;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--ink);
  color: var(--white);
  font: 650 12px var(--mono);
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}
a.buy-control:hover { border-color: var(--signal); background: var(--signal); }
.buy-control:disabled { border-color: #706b63; background: transparent; color: #5f5b54; cursor: not-allowed; opacity: 1; }
.sales-status { min-height: 46px; margin-top: 13px; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }
.purchase-panel ul { display: grid; grid-template-columns: repeat(3, 1fr); margin: 20px 0 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.purchase-panel li { padding: 11px 5px 0 0; font: 9px/1.35 var(--mono); }

.site-footer {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  align-items: center;
  gap: 28px;
  width: var(--page);
  min-height: 124px;
  margin-inline: auto;
  border-top: 1px solid var(--ink);
  color: var(--ink-soft);
  font: 10px var(--mono);
}
.site-footer p:nth-child(2) { text-align: center; }
.site-footer p:last-child { text-align: right; }

@media (prefers-reduced-motion: no-preference) {
  .capture-fragment blockquote span {
    animation: mark-selection 650ms cubic-bezier(.16, 1, .3, 1) 350ms both;
  }
  .model-route::before { transform: scaleY(0); transform-origin: top; animation: trace-down 420ms cubic-bezier(.16, 1, .3, 1) 950ms forwards; }
  .model-route span { transform: scaleX(0); transform-origin: left; animation: trace-across 520ms cubic-bezier(.16, 1, .3, 1) 1250ms forwards; }
  .prompt-result { opacity: 0; clip-path: inset(0 100% 0 0); animation: reveal-prompt 650ms cubic-bezier(.16, 1, .3, 1) 1550ms forwards; }
}
@keyframes mark-selection {
  from { background-color: transparent; }
  to { background-color: var(--signal-pale); }
}
@keyframes trace-down { to { transform: scaleY(1); } }
@keyframes trace-across { to { transform: scaleX(1); } }
@keyframes reveal-prompt { to { opacity: 1; clip-path: inset(0); } }

.download-control, .purchase-result button {
  display: inline-block; padding: 12px 18px; border: 2px solid currentColor;
  background: transparent; color: inherit; font: inherit; font-weight: 700;
}
.download-control[disabled] { opacity: .55; cursor: not-allowed; }
.purchase-result { max-width: 640px; margin: 8vh auto; padding: 24px; }
.purchase-result h1 { font-size: clamp(2.5rem, 10vw, 5rem); }
.purchase-result p { margin: 24px 0; }
.purchase-result textarea { width: 100%; box-sizing: border-box; font: 1rem monospace; padding: 12px; }