:root {
  --paper: #f3f0e8;
  --paper-raised: #fbfaf6;
  --ink: #172126;
  --steel: #53636a;
  --rule: #b9b7ad;
  --signal: #d9542b;
  --signal-dark: #9c3517;
  --ok: #315f50;
  --shadow: 0 1.25rem 3.5rem rgb(23 33 38 / 10%);
  --content: 74rem;
  --serif: Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 20rem;
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgb(23 33 38 / 3%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(23 33 38 / 3%) 1px, transparent 1px),
    radial-gradient(circle at 13% 17%, rgb(255 255 255 / 55%) 0 1px, transparent 1.25px);
  background-size: 1.5rem 1.5rem, 1.5rem 1.5rem, 0.4rem 0.4rem;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.58;
}

a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  min-width: 2.75rem;
  color: var(--signal-dark);
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.16em;
}
a:hover { color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 4px;
}

body > a:first-child {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 0.9rem;
  color: var(--paper-raised);
  background: var(--ink);
  transform: translateY(-170%);
}

body > a:first-child:focus { transform: translateY(0); }

header,
main,
footer {
  width: min(calc(100% - 3rem), var(--content));
  margin-inline: auto;
}

header {
  display: grid;
  grid-template-columns: minmax(15rem, 1fr) auto;
  gap: 1rem 2rem;
  align-items: center;
  min-height: 6.3rem;
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  margin: 0;
  font-family: var(--mono);
  font-weight: 800;
  letter-spacing: -0.08em;
  text-transform: uppercase;
}

.wordmark span { color: var(--signal); letter-spacing: -0.06em; }

nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 0.25rem 0.8rem; }
nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.25rem 0.15rem;
  color: var(--steel);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-decoration: none;
  text-transform: uppercase;
}

nav a:hover { color: var(--signal-dark); }

main { padding-bottom: 4rem; }

section { padding-block: clamp(3rem, 7vw, 6.75rem); }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(16rem, 4fr);
  column-gap: clamp(2rem, 7vw, 7rem);
  align-items: end;
  min-height: min(42rem, 75vh);
}

.hero::after {
  align-self: stretch;
  min-height: 14rem;
  border: 1px solid var(--rule);
  background:
    linear-gradient(135deg, transparent 49.6%, var(--signal) 49.7% 50.3%, transparent 50.4%),
    linear-gradient(0deg, rgb(23 33 38 / 5%) 1px, transparent 1px);
  background-size: 100% 100%, 100% 1.5rem;
  content: "PACK / 01\A TRACE";
  white-space: pre-line;
  color: var(--steel);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 1rem;
  writing-mode: vertical-rl;
}

.hero h1,
h2,
h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.hero h1 { grid-column: 1; max-width: 14ch; font-size: clamp(3rem, 6.6vw, 6.3rem); }
.hero > p:not(.eyebrow) { grid-column: 1; max-width: 41rem; margin: 1.5rem 0 0; color: var(--steel); font-size: 1.1rem; }
.hero > p:last-child { margin-top: 2rem; }

.eyebrow {
  grid-column: 1 / -1;
  margin: 0 0 1rem;
  color: var(--signal-dark);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--signal-dark);
  color: var(--paper-raised);
  background: var(--signal-dark);
  box-shadow: 0.25rem 0.25rem 0 var(--ink);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.025em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.button:hover { color: var(--paper-raised); background: var(--ink); box-shadow: 0.1rem 0.1rem 0 var(--ink); transform: translate(0.15rem, 0.15rem); }

.section-rule { border-top: 1px solid var(--rule); }
h2 { max-width: 20ch; font-size: clamp(2.2rem, 4vw, 4.2rem); }
h3 { font-size: clamp(1.7rem, 3vw, 2.5rem); }

#workflow { display: grid; grid-template-columns: minmax(14rem, 4fr) minmax(0, 7fr); gap: 2rem 6rem; }
#workflow ol { display: grid; gap: 0.8rem; margin: 0; padding: 0; counter-reset: workflow; list-style: none; }
#workflow li {
  display: grid;
  grid-template-columns: 3.1rem 1fr;
  gap: 0.8rem;
  padding: 1rem 0;
  border-top: 1px solid var(--rule);
}
#workflow li::before { counter-increment: workflow; content: "0" counter(workflow); color: var(--signal); font-family: var(--mono); font-size: 0.86rem; font-weight: 800; }
.workflow-step__body { min-width: 0; }
#workflow strong { font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; }

#deliverables { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.25rem; }
#deliverables h2, #deliverables > p { grid-column: 1 / 7; }
#deliverables > p { margin: 0; color: var(--steel); }
#deliverables aside { grid-column: 1 / -1; }
#deliverables > ul { grid-column: 8 / -1; margin: 0; padding: 0; list-style: none; }
#deliverables > ul li { padding: 0.85rem 0; border-top: 1px solid var(--rule); }
#deliverables > ul li::before { content: "↗"; margin-right: 0.75rem; color: var(--signal); font-family: var(--mono); }

.paper-panel {
  padding: clamp(1.2rem, 3vw, 2.25rem);
  border: 1px solid var(--rule);
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.stamp {
  display: inline-block;
  margin: 0 0 1.5rem;
  padding: 0.22rem 0.45rem;
  border: 1px solid var(--signal-dark);
  color: var(--signal-dark);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.065em;
  text-transform: uppercase;
}

.traceability {
  margin: 0 0 1.75rem;
  padding: 1rem;
  border: 1px solid var(--ink);
  background: linear-gradient(90deg, rgb(23 33 38 / 4%) 1px, transparent 1px) 0 0 / 1.5rem 1.5rem;
}

.traceability figcaption { margin-bottom: 0.75rem; font-family: var(--mono); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.05em; text-transform: uppercase; }
.trace-routes { display: grid; gap: 0.45rem; }
.trace-route { display: grid; grid-template-columns: minmax(5rem, 1fr) minmax(3.25rem, 0.6fr) minmax(7.5rem, 1.4fr); gap: 0.4rem; align-items: center; }
.trace-route__source, .trace-route__destination { min-height: 2.75rem; padding: 0.55rem 0.7rem; border: 1px solid var(--rule); background: var(--paper-raised); font-family: var(--mono); font-size: 0.72rem; line-height: 1.3; }
.trace-route__source { color: var(--steel); font-weight: 800; }
.trace-route__destination { color: var(--ok); }
.trace-route__connector { display: flex; align-items: center; gap: 0.25rem; color: var(--signal-dark); font-family: var(--mono); font-size: 1rem; font-weight: 800; }
.trace-route__connector::before { flex: 1; border-top: 2px solid var(--signal); content: ""; }

table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
caption { padding: 0 0 0.75rem; text-align: left; font-family: var(--mono); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; }
th, td { padding: 0.75rem 0.45rem; border-top: 1px solid var(--rule); text-align: left; vertical-align: top; }
th { color: var(--steel); font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.04em; text-transform: uppercase; }
td:first-child { font-family: var(--mono); font-size: 0.8rem; font-weight: 800; }

#probe { display: grid; grid-template-columns: minmax(14rem, 4fr) minmax(0, 7fr); gap: 2rem 6rem; }
#probe article { position: relative; }
#probe article::before { position: absolute; top: -0.55rem; right: 1rem; padding: 0.2rem 0.5rem; color: var(--paper-raised); background: var(--ink); content: "BOUNDED SCOPE"; font-family: var(--mono); font-size: 0.65rem; font-weight: 800; letter-spacing: 0.08em; }
#probe article > p { max-width: 46rem; }
#probe article > p:nth-child(2) { color: var(--signal-dark); font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em; text-transform: uppercase; }

#boundaries { display: grid; grid-template-columns: minmax(14rem, 4fr) minmax(0, 7fr); column-gap: 6rem; }
#boundaries h2 { grid-row: span 4; }
#boundaries p { margin: 0; padding: 1rem 0; border-top: 1px solid var(--rule); }

#faq { display: grid; grid-template-columns: minmax(14rem, 4fr) minmax(0, 7fr); gap: 2rem 6rem; }
dl { margin: 0; }
dt { padding: 1rem 0 0.35rem; border-top: 1px solid var(--rule); font-family: var(--mono); font-size: 0.84rem; font-weight: 800; }
dd { margin: 0; padding-bottom: 1rem; color: var(--steel); }

section:last-child { display: grid; grid-template-columns: minmax(14rem, 4fr) minmax(0, 7fr); gap: 2rem 6rem; }
section:last-child ul { margin: 0; padding: 0; list-style: none; }
section:last-child li { padding: 0.85rem 0; border-top: 1px solid var(--rule); }

footer { display: flex; justify-content: space-between; gap: 1rem 3rem; padding: 1.5rem 0 2.5rem; border-top: 4px solid var(--ink); color: var(--steel); font-family: var(--mono); font-size: 0.74rem; }
footer p { margin: 0; }

[data-js="ready"] main > section { animation: document-in 460ms both ease-out; }
[data-js="ready"] main > section:nth-child(2) { animation-delay: 55ms; }
[data-js="ready"] main > section:nth-child(3) { animation-delay: 110ms; }
@keyframes document-in { from { opacity: 0.01; transform: translateY(0.7rem); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 48rem) {
  header, main, footer { width: min(calc(100% - 2rem), var(--content)); }
  header { grid-template-columns: 1fr; padding-block: 1rem; }
  nav { justify-content: flex-start; }
  .hero, #workflow, #probe, #boundaries, #faq, section:last-child { display: block; min-height: 0; }
  .hero::after { display: block; min-height: 8rem; margin-top: 2rem; writing-mode: horizontal-tb; }
  .hero h1 { max-width: 12ch; }
  .hero > p:not(.eyebrow), #workflow ol, #probe article, #faq dl, section:last-child ul { margin-top: 2rem; }
  #deliverables { display: block; }
  #deliverables > p, #deliverables aside, #deliverables > ul { margin-top: 1.5rem; }
  #boundaries h2 { margin-bottom: 2rem; }
  .trace-route { grid-template-columns: minmax(4.5rem, 1fr) minmax(2.5rem, 0.5fr) minmax(6.5rem, 1.3fr); gap: 0.25rem; }
  .trace-route__source, .trace-route__destination { padding-inline: 0.45rem; font-size: 0.65rem; }
  table { display: block; overflow-x: auto; white-space: nowrap; }
  footer { display: block; }
  footer p + p { margin-top: 0.5rem; }
}

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