:root {
  --ink: #101112;
  --paper: #f3f0e9;
  --white: #ffffff;
  --steel: #b7bdc0;
  --muted: #686b6d;
  --red: #df191f;
  --red-dark: #a90d12;
  --line: rgba(16, 17, 18, 0.15);
  --display: "Arial Narrow", "Helvetica Neue Condensed", "Roboto Condensed",
    "Franklin Gothic Medium", Arial, sans-serif;
  --body: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max: 1440px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
a {
  color: inherit;
}

a {
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button,
summary {
  font: inherit;
}

::selection {
  background: var(--red);
  color: var(--white);
}

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.8rem 1rem;
  background: var(--white);
  color: var(--ink);
  font-weight: 700;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  min-height: 88px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(243, 240, 233, 0.96);
  backdrop-filter: blur(16px);
}

.brand {
  width: clamp(180px, 18vw, 252px);
}

.brand img {
  width: 100%;
  height: auto;
}

.desktop-nav {
  display: flex;
  align-items: center;
  height: 100%;
}

.desktop-nav a {
  display: grid;
  place-items: center;
  height: 100%;
  padding: 0 1.35rem;
  border-left: 1px solid var(--line);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 180ms ease, background 180ms ease;
}

.desktop-nav a:hover {
  background: var(--white);
  color: var(--red);
}

.header-cta {
  display: flex;
  align-items: center;
  align-self: stretch;
  gap: 2.5rem;
  padding: 0 2rem;
  background: var(--red);
  color: var(--white);
  font-family: var(--display);
  font-size: 0.88rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background 180ms ease;
}

.header-cta:hover {
  background: var(--red-dark);
}

.mobile-menu {
  display: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(480px, 0.92fr);
  min-height: calc(100vh - 88px);
  max-height: 960px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 7vw 5vw 6vw;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.8rem;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow span {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--red);
  transform: rotate(45deg);
}

.eyebrow-dark {
  color: var(--muted);
}

.hero .eyebrow {
  color: var(--muted);
}

.hero h1,
.section-intro h2,
.showcase-heading h2,
.culture h2,
.about-copy h2,
.contact h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 900;
  letter-spacing: -0.055em;
  line-height: 0.9;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 960px;
  font-size: clamp(4.2rem, 7vw, 8.2rem);
}

.hero h1 em,
.section-intro h2 em,
.culture h2 em {
  color: var(--red);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  letter-spacing: -0.075em;
  text-transform: none;
}

.hero-lede {
  max-width: 610px;
  margin: 2.2rem 0 0;
  color: #4a4c4e;
  font-size: clamp(1.05rem, 1.4vw, 1.35rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-top: 2.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  min-height: 56px;
  padding: 0 1.3rem;
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: transform 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--red);
  color: var(--white);
}

.button-primary:hover {
  background: var(--red-dark);
}

.button-dark {
  background: var(--ink);
  color: var(--white);
}

.button-dark:hover {
  background: #292b2c;
}

.text-link {
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--ink);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-visual {
  position: relative;
  min-height: 650px;
  overflow: hidden;
  background: var(--ink);
  color: var(--white);
}

.hero-image {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      180deg,
      rgba(16, 17, 18, 0.05) 30%,
      rgba(16, 17, 18, 0.82) 100%
    ),
    url("assets/bt-aerospace-building.jpg");
  background-position: center;
  background-size: cover;
  transform: scale(1.02);
  transition: transform 900ms ease;
}

.hero-visual:hover .hero-image {
  transform: scale(1.055);
}

.hero-visual::before {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  width: 8px;
  height: 44%;
  background: var(--red);
  content: "";
}

.hero-visual::after {
  position: absolute;
  right: -15%;
  bottom: -22%;
  z-index: 1;
  width: 62%;
  aspect-ratio: 1;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 50%;
  box-shadow: 0 0 0 38px rgba(255, 255, 255, 0.04),
    0 0 0 82px rgba(255, 255, 255, 0.03);
  content: "";
}

.hero-tag {
  position: absolute;
  top: 2rem;
  right: 2rem;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 0.85rem;
  background: rgba(16, 17, 18, 0.72);
  backdrop-filter: blur(12px);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #75d68a;
  box-shadow: 0 0 0 4px rgba(117, 214, 138, 0.15);
}

.hero-index {
  position: absolute;
  bottom: 3.5rem;
  left: 3.5rem;
  z-index: 3;
  font-family: var(--display);
  font-size: clamp(5rem, 10vw, 9rem);
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 0.75;
}

.hero-index span {
  color: var(--red);
}

.hero-index-label {
  position: absolute;
  bottom: 2.2rem;
  left: 3.7rem;
  z-index: 3;
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
}

.proof-strip > div {
  min-width: 0;
  padding: 1.7rem 2.5rem;
  border-right: 1px solid var(--line);
}

.proof-strip > div:last-child {
  border-right: 0;
}

.proof-strip strong,
.proof-strip span {
  display: block;
}

.proof-strip strong {
  overflow: hidden;
  font-family: var(--display);
  font-size: clamp(1.15rem, 2vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.proof-strip span {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.6fr);
  column-gap: 8vw;
  align-items: end;
}

.section-intro .eyebrow {
  grid-column: 1 / -1;
}

.section-intro h2,
.culture h2,
.contact h2 {
  font-size: clamp(3.2rem, 6.4vw, 7.2rem);
}

.section-intro > p:last-child {
  max-width: 520px;
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: clamp(1rem, 1.25vw, 1.24rem);
  line-height: 1.6;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(4rem, 7vw, 7rem);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.capability-card {
  position: relative;
  min-height: 360px;
  padding: 2rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 220ms ease, color 220ms ease, transform 220ms ease;
}

.capability-card:hover {
  z-index: 2;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-8px);
}

.capability-number {
  color: var(--red);
  font-family: var(--display);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.capability-card h3 {
  max-width: 240px;
  margin: 7rem 0 1rem;
  font-family: var(--display);
  font-size: clamp(1.6rem, 2vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.98;
  text-transform: uppercase;
}

.capability-card p {
  max-width: 320px;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
  transition: color 220ms ease;
}

.capability-card:hover p {
  color: rgba(255, 255, 255, 0.68);
}

.card-mark {
  position: absolute;
  top: 1.75rem;
  right: 1.75rem;
  font-size: 1.3rem;
}

.work-showcase {
  padding: clamp(5rem, 9vw, 9rem) 5vw 5vw;
  background: var(--ink);
  color: var(--white);
}

.showcase-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 2rem;
  margin-bottom: 4rem;
}

.showcase-heading .eyebrow {
  grid-column: 1 / -1;
}

.showcase-heading h2 {
  font-size: clamp(3.5rem, 7vw, 7.8rem);
}

.showcase-heading > p:last-child {
  margin: 0 0 0.5rem;
  color: rgba(255, 255, 255, 0.56);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: 210px;
  gap: 12px;
}

.work-photo {
  grid-column: span 4;
  margin: 0;
  overflow: hidden;
  background: #222;
}

.work-photo-wide {
  grid-column: span 8;
  grid-row: span 2;
}

.work-photo-tall {
  grid-row: span 2;
}

.work-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.03);
  transition: filter 400ms ease, transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.work-photo:hover img {
  filter: saturate(1) contrast(1.02);
  transform: scale(1.045);
}

.culture {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(450px, 0.75fr);
  gap: 9vw;
  align-items: start;
  background: #dedbd3;
}

.culture-statement {
  position: sticky;
  top: 140px;
}

.culture-lede {
  max-width: 680px;
  margin: 2.5rem 0;
  color: #535556;
  font-size: clamp(1.06rem, 1.4vw, 1.3rem);
  line-height: 1.65;
}

.culture-panel {
  background: var(--paper);
  border: 1px solid rgba(16, 17, 18, 0.18);
}

.culture-panel-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.4rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.culture-panel ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.culture-panel li {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 1.5rem;
  min-height: 190px;
  padding: 2.3rem 2rem;
  border-bottom: 1px solid var(--line);
}

.culture-panel li:last-child {
  border-bottom: 0;
}

.culture-panel li > span {
  color: var(--red);
  font-family: var(--display);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.culture-panel h3 {
  margin: 0 0 0.8rem;
  font-family: var(--display);
  font-size: clamp(1.75rem, 2.4vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.culture-panel p {
  max-width: 430px;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: 780px;
  background: var(--ink);
  color: var(--white);
}

.about-image {
  min-height: 580px;
  overflow: hidden;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.about-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(4rem, 7vw, 8rem);
}

.about-copy h2 {
  max-width: 700px;
  font-size: clamp(3.6rem, 6vw, 7rem);
}

.about-lede {
  max-width: 650px;
  margin: 2.5rem 0;
  color: rgba(255, 255, 255, 0.64);
  font-size: clamp(1rem, 1.3vw, 1.22rem);
  line-height: 1.65;
}

.about blockquote {
  max-width: 580px;
  margin: 1rem 0 2.5rem;
  padding-left: 1.4rem;
  border-left: 3px solid var(--red);
  color: var(--white);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.3rem, 2vw, 2rem);
  font-style: italic;
  line-height: 1.4;
}

.about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.about-meta span {
  padding: 0.55rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.8fr);
  gap: 8vw;
  align-items: end;
}

.contact-actions {
  border-top: 1px solid var(--line);
}

.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.6rem 0.2rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--display);
  font-size: clamp(1.25rem, 2vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  transition: color 180ms ease, padding 180ms ease;
}

.contact-row:hover {
  padding-right: 0;
  padding-left: 0.6rem;
  color: var(--red);
}

.contact-row small {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-family: var(--body);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.contact-row strong {
  font-size: 1.4rem;
}

footer {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 5vw;
  padding: 4rem 5vw 1.5rem;
  background: #080909;
  color: var(--white);
}

.footer-brand img {
  width: min(260px, 80%);
  filter: brightness(0) invert(1);
}

.footer-brand p {
  max-width: 370px;
  margin: 1.5rem 0 0;
  color: rgba(255, 255, 255, 0.48);
  line-height: 1.5;
}

footer small {
  display: block;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.38);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-address address,
.footer-links {
  font-size: 0.9rem;
  font-style: normal;
  line-height: 1.8;
}

.footer-links a {
  display: block;
  width: max-content;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover {
  color: var(--white);
}

.footer-base {
  display: flex;
  grid-column: 1 / -1;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.36);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@media (max-width: 1120px) {
  .site-header {
    grid-template-columns: 1fr auto;
    min-height: 76px;
  }

  .desktop-nav,
  .header-cta {
    display: none;
  }

  .mobile-menu {
    position: relative;
    display: block;
  }

  .mobile-menu summary {
    display: grid;
    gap: 8px;
    width: 48px;
    height: 48px;
    padding: 15px 11px;
    border: 1px solid var(--line);
    cursor: pointer;
    list-style: none;
  }

  .mobile-menu summary::-webkit-details-marker {
    display: none;
  }

  .mobile-menu summary span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--ink);
  }

  .mobile-menu[open] summary span:first-child {
    transform: translateY(5px) rotate(45deg);
  }

  .mobile-menu[open] summary span:last-child {
    transform: translateY(-5px) rotate(-45deg);
  }

  .mobile-menu nav {
    position: absolute;
    top: calc(100% + 14px);
    right: 0;
    display: grid;
    width: min(320px, calc(100vw - 2rem));
    padding: 0.6rem;
    border: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 16px 50px rgba(16, 17, 18, 0.18);
  }

  .mobile-menu nav a {
    padding: 1rem;
    border-bottom: 1px solid var(--line);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .mobile-menu nav a:last-child {
    border: 0;
    background: var(--red);
    color: var(--white);
  }

  .hero {
    grid-template-columns: 1fr;
    max-height: none;
  }

  .hero-copy {
    min-height: 680px;
  }

  .hero-visual {
    min-height: 620px;
  }

  .capability-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .culture {
    gap: 5vw;
  }

  .about {
    min-height: auto;
  }

  .about-copy {
    padding: 5rem;
  }
}

@media (max-width: 780px) {
  .site-header {
    padding: 0 1rem;
  }

  .brand {
    width: 190px;
  }

  .hero-copy {
    min-height: auto;
    padding: 6.5rem 1.25rem 5rem;
    background-size: 48px 48px;
  }

  .hero h1 {
    font-size: clamp(3.8rem, 18vw, 6.4rem);
  }

  .hero-lede {
    font-size: 1.02rem;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 1rem;
  }

  .button {
    width: 100%;
  }

  .text-link {
    width: max-content;
  }

  .hero-visual {
    min-height: 500px;
  }

  .hero-tag {
    top: 1rem;
    right: 1rem;
  }

  .hero-index {
    bottom: 3.3rem;
    left: 1.3rem;
  }

  .hero-index-label {
    left: 1.5rem;
  }

  .proof-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .proof-strip > div {
    padding: 1.4rem 1.2rem;
    border-bottom: 1px solid var(--line);
  }

  .proof-strip > div:nth-child(2) {
    border-right: 0;
  }

  .section-shell {
    padding: 5.5rem 1.25rem;
  }

  .section-intro,
  .showcase-heading,
  .culture,
  .about,
  .contact {
    grid-template-columns: 1fr;
  }

  .section-intro h2,
  .culture h2,
  .contact h2 {
    font-size: clamp(3.1rem, 15vw, 5.4rem);
  }

  .section-intro > p:last-child {
    margin-top: 2rem;
  }

  .capability-grid {
    grid-template-columns: 1fr;
    margin-top: 3.5rem;
  }

  .capability-card {
    min-height: 300px;
  }

  .capability-card h3 {
    margin-top: 5rem;
  }

  .work-showcase {
    padding: 5.5rem 1.25rem 1.25rem;
  }

  .showcase-heading {
    margin-bottom: 2.5rem;
  }

  .showcase-heading h2 {
    font-size: clamp(3.3rem, 16vw, 5.8rem);
  }

  .work-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 200px;
  }

  .work-photo,
  .work-photo-wide {
    grid-column: span 1;
    grid-row: span 1;
  }

  .work-photo-wide {
    grid-column: 1 / -1;
    grid-row: span 2;
  }

  .work-photo-tall {
    grid-row: span 2;
  }

  .culture {
    gap: 4rem;
  }

  .culture-statement {
    position: static;
  }

  .culture-panel li {
    grid-template-columns: 36px 1fr;
    gap: 0.75rem;
    min-height: 0;
    padding: 2rem 1.2rem;
  }

  .culture-panel-top {
    align-items: flex-start;
    flex-direction: column;
  }

  .about-image {
    min-height: 480px;
  }

  .about-copy {
    padding: 5rem 1.25rem;
  }

  .about-copy h2 {
    font-size: clamp(3.4rem, 16vw, 5.8rem);
  }

  .contact {
    gap: 3.5rem;
  }

  .contact-row {
    align-items: flex-end;
    font-size: clamp(1rem, 5.5vw, 1.45rem);
    overflow-wrap: anywhere;
  }

  footer {
    grid-template-columns: 1fr 1fr;
    padding: 3.5rem 1.25rem 1.5rem;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-base {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.6rem;
  }
}

@media (max-width: 450px) {
  .proof-strip strong {
    font-size: 1rem;
  }

  .work-grid {
    display: block;
  }

  .work-photo {
    height: 280px;
    margin-bottom: 10px;
  }

  .work-photo-wide {
    height: 420px;
  }

  footer {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}