:root {
  color-scheme: light;
  --graphite: #252b30;
  --charcoal: #1f2327;
  --steel: #4e6270;
  --bronze: #a67d4d;
  --warm-gray: #d9d5ce;
  --mist: #f4f5f6;
  --paper: #f0efeb;
  --ink-soft: #596067;
  --line: rgba(37, 43, 48, 0.18);
  --max: 1440px;
  --side: clamp(1.25rem, 4.5vw, 5rem);
  --sans: "Aptos", "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--graphite);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }

a { color: inherit; text-decoration: none; }
button { font: inherit; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  color: var(--mist);
  background: var(--graphite);
}

.skip-link:focus { top: 1rem; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(200px, 0.8fr) minmax(0, 1.2fr);
  min-height: 5.25rem;
  color: var(--graphite);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(18px);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.95rem;
  padding: 0 var(--side);
  border-right: 1px solid var(--line);
}

.brand-lockup svg {
  width: 2.15rem;
  height: auto;
}

.brand-name {
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.nav-panel {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 var(--side);
}

.primary-nav { display: flex; align-items: center; gap: clamp(1.2rem, 2.8vw, 2.75rem); }
.primary-nav a {
  position: relative;
  font-size: 0.83rem;
  color: #3e474d;
}
.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -0.6rem;
  height: 1px;
  background: var(--bronze);
  transition: right 180ms ease;
}
.primary-nav a:hover::after,
.primary-nav a:focus-visible::after { right: 0; }

.menu-button {
  display: none;
  border: 0;
  color: var(--graphite);
  background: transparent;
}

.hero {
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(330px, 0.8fr) minmax(0, 1.2fr);
  padding-top: 5.25rem;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: calc(100svh - 5.25rem);
  padding: clamp(4rem, 8vh, 7rem) var(--side) clamp(2rem, 5vh, 4rem);
  border-right: 1px solid var(--line);
}

.eyebrow,
.section-index,
.technical-label,
.status-line,
.profile-mode,
.system-meta,
.footer-meta,
.evidence-status {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--steel);
}
.eyebrow::before {
  content: "";
  width: 1.9rem;
  height: 1px;
  background: var(--bronze);
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 8ch;
  margin: 2.75rem 0 1.5rem;
  font-size: clamp(3.4rem, 7vw, 7rem);
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: -0.065em;
}

.hero-lede {
  max-width: 32rem;
  margin-bottom: 2rem;
  font-size: clamp(1.08rem, 1.6vw, 1.35rem);
  line-height: 1.55;
  color: #495158;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  width: max-content;
  padding-bottom: 0.32rem;
  font-size: 0.9rem;
  font-weight: 650;
  border-bottom: 1px solid var(--bronze);
}
.text-link .line {
  width: 1.8rem;
  height: 1px;
  background: currentColor;
  transition: width 180ms ease;
}
.text-link:hover .line { width: 2.5rem; }

.hero-foot {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 4rem;
}

.status-line { color: var(--ink-soft); }
.status-line strong { color: var(--graphite); font-weight: 700; }

.scroll-mark {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.profile-stage {
  position: relative;
  min-height: calc(100svh - 5.25rem);
  overflow: hidden;
  color: var(--mist);
  background: var(--charcoal);
}

.profile-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(255,255,255,0.03), transparent 42%, rgba(176,138,91,0.025));
}

.profile-grid {
  position: absolute;
  inset: 0;
  opacity: 0.45;
  background-image:
    linear-gradient(rgba(244,245,246,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,245,246,0.045) 1px, transparent 1px),
    linear-gradient(rgba(244,245,246,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,245,246,0.025) 1px, transparent 1px);
  background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
}

.profile-header {
  position: absolute;
  inset: 2rem 2rem auto;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.technical-label { color: #b6c0c6; }
.profile-mode {
  display: flex;
  padding: 0.35rem;
  border: 1px solid rgba(244,245,246,0.14);
}
.profile-mode button {
  min-height: 2.1rem;
  padding: 0 0.8rem;
  border: 0;
  color: #9aa7af;
  background: transparent;
  cursor: pointer;
}
.profile-mode button[aria-pressed="true"] {
  color: var(--charcoal);
  background: var(--warm-gray);
}

.profile-drawing {
  position: absolute;
  inset: 13% 5% 10%;
  width: 90%;
  height: 77%;
}
.profile-drawing text { font-family: var(--mono); letter-spacing: 0.08em; }
.centerline { stroke-dasharray: 12 9; }
.contour-main {
  fill: rgba(78,98,112,0.1);
  stroke: #dbe0e2;
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}
.contour-secondary,
.datum-line,
.assumption-line,
.annotation-line {
  fill: none;
  stroke: rgba(217,213,206,0.45);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.accent-line { stroke: var(--bronze); }
.annotation-group,
.load-group { transition: opacity 180ms ease; }
.profile-stage[data-mode="profile"] .annotation-group,
.profile-stage[data-mode="profile"] .load-group { opacity: 0.06; }
.profile-stage[data-mode="evidence"] .annotation-group { opacity: 1; }
.profile-stage[data-mode="evidence"] .load-group { opacity: 0.18; }
.profile-stage[data-mode="loads"] .annotation-group { opacity: 0.18; }
.profile-stage[data-mode="loads"] .load-group { opacity: 1; }

.profile-note {
  position: absolute;
  right: 2rem;
  bottom: 1.75rem;
  left: 2rem;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 1rem;
  color: #9eaaaf;
  border-top: 1px solid rgba(244,245,246,0.12);
  font-size: 0.78rem;
}

.section {
  padding: clamp(5rem, 10vw, 9rem) var(--side);
}

.section-inner { max-width: var(--max); margin: 0 auto; }
.section-head {
  display: grid;
  grid-template-columns: 0.28fr 0.72fr;
  gap: 2rem;
  margin-bottom: clamp(3rem, 6vw, 6rem);
}
.section-index { color: var(--steel); }
.section-head h2 {
  max-width: 17ch;
  margin-bottom: 0;
  font-size: clamp(2.25rem, 4.5vw, 4.75rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.systems { background: var(--mist); }
.systems-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.system-card {
  min-height: 32rem;
  padding: clamp(2rem, 4vw, 4rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.system-card + .system-card { border-left: 1px solid var(--line); }
.system-card h3 {
  margin-bottom: 1rem;
  font-size: clamp(2.5rem, 5vw, 5rem);
  font-weight: 550;
  letter-spacing: -0.055em;
}
.system-meta { color: var(--steel); }
.system-copy { max-width: 31rem; }
.system-copy p {
  font-size: 1.05rem;
  line-height: 1.65;
  color: #4d565c;
}

.relationship {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  margin-top: 3.5rem;
  color: var(--steel);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.relationship span:last-child { text-align: right; }
.relationship-line {
  position: relative;
  width: clamp(5rem, 14vw, 15rem);
  height: 1px;
  background: var(--bronze);
}
.relationship-line::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--bronze);
  transform: rotate(45deg);
  background: var(--mist);
}

.capabilities {
  margin-top: clamp(5rem, 10vw, 9rem);
  scroll-margin-top: 6rem;
  border-top: 1px solid var(--line);
}

.capabilities-head {
  display: grid;
  grid-template-columns: 0.28fr 0.72fr;
  gap: 2rem;
  padding: clamp(2rem, 4vw, 3.5rem) 0 clamp(2.5rem, 5vw, 4.5rem);
}

.capabilities-head h3 {
  max-width: 15ch;
  margin-bottom: 1.5rem;
  font-size: clamp(2.25rem, 4.5vw, 4.75rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.capabilities-head > div > p {
  max-width: 41rem;
  margin: 0;
  color: #4d565c;
  font-size: 1.05rem;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.capability-card {
  min-height: 24rem;
  padding: clamp(1.75rem, 3vw, 3rem);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(240, 239, 235, 0.45);
}

.capability-card-wide { grid-column: 1 / -1; }

.capability-meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: clamp(4rem, 8vw, 7rem);
  color: var(--steel);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.capability-state {
  padding: 0.3rem 0.45rem;
  color: #73532f;
  border: 1px solid rgba(166, 125, 77, 0.5);
  white-space: nowrap;
}

.capability-card h4 {
  max-width: 18ch;
  margin: 0 0 1rem;
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  font-weight: 520;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.capability-card p {
  max-width: 43rem;
  margin: 0;
  color: #4d565c;
  font-size: 1.02rem;
  line-height: 1.65;
}

.capability-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 2.25rem 0 0;
  padding: 0;
  list-style: none;
}

.capability-chips li {
  padding: 0.55rem 0.75rem;
  color: var(--steel);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.capability-card-dark {
  color: var(--mist);
  background: var(--graphite);
}

.capability-card-dark .capability-meta { color: #aeb8bd; }
.capability-card-dark .capability-state { color: #d9c3a7; border-color: rgba(217, 195, 167, 0.42); }
.capability-card-dark p { color: #b9c1c5; }

.capabilities-foot {
  margin: 0;
  padding: 1.35rem 0 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.6;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.development-notice {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: end;
  margin-top: 2rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: rgba(244, 245, 246, 0.48);
}
.development-notice p {
  max-width: 50rem;
  margin: 0;
  color: #4d565c;
  line-height: 1.6;
}
.development-notice strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--graphite);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.development-notice .text-link { white-space: nowrap; }

.method {
  color: var(--mist);
  background: var(--charcoal);
}
.method .section-index { color: #95a3aa; }
.method .section-head h2 { color: #f3f1ed; }
.method-grid {
  display: grid;
  grid-template-columns: minmax(230px, 0.36fr) minmax(0, 0.64fr);
  gap: clamp(3rem, 8vw, 9rem);
}
.method-intro {
  max-width: 24rem;
  color: #b9c1c5;
  font-size: 1.08rem;
}
.method-quote {
  margin-top: 4rem;
  padding: 1.5rem 0 1.5rem 1.5rem;
  color: var(--warm-gray);
  border-left: 2px solid var(--bronze);
  font-size: 1.2rem;
  line-height: 1.45;
}
.evidence-list { border-top: 1px solid rgba(244,245,246,0.16); }
.evidence-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1.5rem;
  align-items: start;
  padding: 1.75rem 0;
  border-bottom: 1px solid rgba(244,245,246,0.16);
}
.evidence-number {
  color: var(--bronze);
  font-family: var(--mono);
  font-size: 0.82rem;
}
.evidence-item h3 { margin-bottom: 0.45rem; font-size: 1.15rem; font-weight: 600; }
.evidence-item p { margin: 0; max-width: 34rem; color: #aeb8bd; }
.evidence-status {
  padding-top: 0.15rem;
  color: #8f9aa0;
  white-space: nowrap;
}

.closing {
  min-height: 64vh;
  display: grid;
  grid-template-columns: minmax(0, 0.65fr) minmax(260px, 0.35fr);
  border-top: 1px solid var(--line);
}
.closing-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 64vh;
  padding: clamp(4rem, 8vw, 8rem) var(--side) 2rem;
  border-right: 1px solid var(--line);
}
.closing h2 {
  max-width: 12ch;
  margin-bottom: 3rem;
  font-size: clamp(3rem, 7vw, 7rem);
  font-weight: 500;
  line-height: 0.94;
  letter-spacing: -0.06em;
}
.contact-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 44rem;
  margin-top: clamp(2.5rem, 5vw, 5rem);
  padding: 1.35rem 0;
  color: var(--graphite);
  border-top: 1px solid var(--graphite);
  border-bottom: 1px solid var(--graphite);
}
.contact-link span {
  font-size: clamp(1.15rem, 2vw, 1.65rem);
  font-weight: 600;
}
.contact-link small {
  color: #5f6c73;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.contact-link:hover small,
.contact-link:focus-visible small { color: var(--bronze); }
.closing-aside {
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  min-height: 24rem;
  background: var(--warm-gray);
}
.closing-aside::before,
.closing-aside::after {
  content: "";
  position: absolute;
  inset: 8%;
  border: 1px solid rgba(37,43,48,0.12);
}
.closing-aside::after { inset: 16%; }
.contact-checklist {
  position: relative;
  z-index: 1;
  width: min(72%, 25rem);
}
.contact-checklist h3 {
  max-width: 12ch;
  margin: 1.2rem 0 clamp(2.5rem, 5vw, 4.5rem);
  font-size: clamp(2rem, 3.2vw, 3.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.045em;
}
.contact-checklist ol {
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(37,43,48,0.3);
}
.contact-checklist li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(37,43,48,0.3);
}
.contact-checklist li span,
.contact-checklist > p:last-child {
  color: #66727a;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.contact-checklist li strong { font-weight: 600; }

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  padding: 1.25rem var(--side);
  color: #aeb7bc;
  background: var(--charcoal);
}
.footer-meta { display: flex; gap: 2rem; flex-wrap: wrap; }
.site-footer a { color: var(--mist); }

.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.is-pending { opacity: 0; transform: translateY(1.3rem); }
.reveal.is-visible { opacity: 1; transform: none; }

:focus-visible { outline: 2px solid var(--bronze); outline-offset: 4px; }

@media (max-width: 920px) {
  .site-header { grid-template-columns: 1fr auto; }
  .brand-lockup { border-right: 0; }
  .nav-panel { padding-left: 1rem; }
  .menu-button { display: block; position: relative; z-index: 2; padding: 1rem 0; }
  .primary-nav {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    color: var(--mist);
    background: var(--charcoal);
    visibility: hidden;
    opacity: 0;
    transition: opacity 180ms ease, visibility 180ms ease;
  }
  .primary-nav a { color: var(--mist); font-size: 1.5rem; }
  .menu-open .site-header {
    color: var(--mist);
    border-bottom-color: transparent;
    background: transparent;
    backdrop-filter: none;
  }
  .menu-open .brand-lockup { position: relative; z-index: 2; color: var(--mist); }
  .menu-open .primary-nav { visibility: visible; opacity: 1; }
  .development-notice { grid-template-columns: 1fr; align-items: start; }
  .development-notice .text-link { white-space: normal; }
  .menu-open .menu-button { color: var(--mist); }
  .hero { grid-template-columns: 1fr; }
  .hero-copy { min-height: auto; border-right: 0; }
  .profile-stage { min-height: 67svh; }
  .section-head,
  .capabilities-head { grid-template-columns: 1fr; gap: 1rem; }
  .method-grid { grid-template-columns: 1fr; gap: 3rem; }
  .method-quote { margin-top: 2rem; }
}

@media (max-width: 680px) {
  .site-header { min-height: 4.5rem; }
  .brand-lockup { padding-left: 1.1rem; }
  .nav-panel { padding-right: 1.1rem; }
  .hero { padding-top: 4.5rem; }
  .hero-copy { padding-top: 3.5rem; }
  .hero-foot { align-items: start; flex-direction: column; }
  .profile-header { inset: 1.25rem 1.25rem auto; align-items: flex-start; }
  .profile-mode button { padding: 0 0.55rem; font-size: 0.65rem; }
  .profile-note { right: 1.25rem; bottom: 1.25rem; left: 1.25rem; flex-direction: column; gap: 0.5rem; }
  .systems-grid,
  .capability-grid,
  .closing { grid-template-columns: 1fr; }
  .system-card { min-height: 27rem; }
  .system-card + .system-card,
  .relationship { grid-template-columns: 1fr; }
  .capability-card-wide { grid-column: auto; }
  .capability-card { min-height: auto; }
  .capability-meta { margin-bottom: 3.5rem; }
  .relationship span:last-child { text-align: left; }
  .relationship-line { width: 100%; }
  .evidence-item { grid-template-columns: 2rem 1fr; }
  .evidence-status { grid-column: 2; }
  .closing-copy { min-height: 56vh; border-right: 0; border-bottom: 1px solid var(--line); }
  .contact-link { align-items: flex-start; flex-direction: column; }
  .contact-checklist { width: min(78%, 25rem); }
  .site-footer { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}