:root {
  --white: #ffffff;
  --paper: #f6f7f8;
  --line: #d9dee3;
  --ink: #121416;
  --muted: #626b73;
  --steel: #2f3740;
  --graphite: #20252a;
  --red: #b21f2d;
  --red-dark: #8f1824;
  --blueprint: #27516b;
  --shadow: 0 18px 55px rgba(18, 20, 22, 0.12);
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 100;
  padding: 12px 18px;
  color: var(--white);
  background: var(--ink);
  font-weight: 700;
  border-radius: 0 0 6px 6px;
}

.skip-link:focus {
  top: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 26px;
  min-height: 76px;
  padding: 0 clamp(18px, 4vw, 52px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(217, 222, 227, 0.8);
  backdrop-filter: blur(12px);
  transition: min-height 220ms ease, box-shadow 220ms ease, background 220ms ease;
}

.site-header.is-scrolled {
  min-height: 64px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 8px 24px rgba(18, 20, 22, 0.08);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  background: transparent;
  padding: 0;
}

.brand-mark img {
  height: 100%;
  width: auto;
  max-height: 38px;
}

.brand-text {
  color: var(--steel);
  font-size: 0.84rem;
  font-weight: 700;
  text-transform: uppercase;
}

.main-nav {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--steel);
  font-size: 0.9rem;
  font-weight: 650;
}

.main-nav a,
.site-footer a {
  transition: color 180ms ease;
}

.main-nav a:hover,
.site-footer a:hover {
  color: var(--red);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: color 180ms ease;
}

.nav-dropdown-trigger:hover,
.nav-dropdown.is-open .nav-dropdown-trigger {
  color: var(--red);
}

.nav-dropdown-trigger::after {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 180ms ease;
}

.nav-dropdown.is-open .nav-dropdown-trigger::after {
  transform: rotate(-135deg) translateY(1px);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  min-width: 230px;
  padding: 8px 0;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
  z-index: 30;
}

.nav-dropdown.is-open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-menu a {
  display: block;
  padding: 10px 18px;
  color: var(--steel);
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  color: var(--red);
  background: var(--paper);
}

.nav-mobile-cta {
  display: none;
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  font-size: 0.92rem;
  font-weight: 750;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.header-cta,
.btn-primary {
  color: var(--white);
  background: var(--red);
}

.header-cta:hover,
.btn-primary:hover {
  background: var(--red-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  color: var(--ink);
  background: var(--white);
  border-color: var(--line);
}

.btn-secondary:hover {
  border-color: var(--ink);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--white);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.section,
.hero {
  padding: clamp(50px, 8vw, 90px) clamp(18px, 4vw, 52px);
}

.section-band {
  border-bottom: 1px solid var(--line);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.8fr);
  align-items: center;
  gap: clamp(24px, 6vw, 72px);
  min-height: auto;
  background:
    linear-gradient(135deg, rgba(246, 247, 248, 0.92), rgba(255, 255, 255, 0.96)),
    repeating-linear-gradient(90deg, rgba(47, 55, 64, 0.08) 0, rgba(47, 55, 64, 0.08) 1px, transparent 1px, transparent 76px);
}

.hero-content,
.hero-media,
.section-grid,
.section-heading,
.grooved-layout,
.cards-grid,
.applications-grid,
.download-grid,
.faq-list,
.contact,
.site-footer {
  width: min(100%, var(--max));
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--red);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 830px;
  margin-bottom: 20px;
  font-size: clamp(2.7rem, 8vw, 6.1rem);
  line-height: 0.94;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.08rem;
  line-height: 1.25;
}

.hero-subtitle {
  max-width: 690px;
  color: var(--steel);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  max-width: 720px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}

.hero-highlights li {
  position: relative;
  padding-left: 28px;
  color: var(--graphite);
  font-weight: 650;
}

.hero-highlights li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--red);
  font-weight: 900;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  padding: clamp(18px, 4vw, 42px);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  height: clamp(480px, 67.5vh, 780px);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-media img {
  width: auto;
  height: 100%;
  max-width: 100%;
  object-fit: contain;
  object-position: center;
  background: var(--paper);
}

.section-muted {
  background: var(--paper);
}

.section-dark {
  color: var(--white);
  background: var(--graphite);
}

.section-dark .eyebrow,
.section-dark strong {
  color: #ffccd1;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.82fr);
  gap: clamp(20px, 5vw, 60px);
  align-items: start;
}

.section-copy p,
.section-heading p,
.technical-copy p,
.narrow p,
.contact-copy p {
  color: var(--muted);
  font-size: 1.03rem;
}

.narrow {
  width: min(100%, 860px);
  margin-inline: auto;
}

.feature-list,
.reference-list {
  display: grid;
  gap: 12px;
}

.feature-list span,
.reference-list span {
  padding: 16px 18px;
  background: var(--white);
  border-left: 4px solid var(--red);
  box-shadow: inset 0 0 0 1px var(--line);
  font-weight: 700;
}

.section-heading {
  max-width: 830px;
  margin-bottom: 28px;
}

.section-heading p a {
  color: var(--red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.grooved-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.76fr) minmax(0, 1fr);
  gap: 22px;
}

.technical-copy {
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--white);
}

.technical-copy img {
  width: 100%;
  margin-top: 22px;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.process-step,
.benefit-card,
.application-card,
.download-card {
  background: var(--white);
  border: 1px solid var(--line);
}

.process-step {
  padding: 18px;  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;}

.process-step span,
.benefit-card span,
.download-card span {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--red);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.process-step img {
  width: auto;
  height: 100%;
  max-width: 100%;
  object-fit: contain;
  object-position: center;
}

.cards-grid,
.applications-grid,
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.benefit-card {
  min-height: 180px;
  padding: 20px;
}

.benefit-card p,
.application-card li,
.download-card small,
.faq-list p,
.site-footer p {
  color: var(--muted);
}

.application-card {
  overflow: hidden;
}

.application-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.application-card h3,
.application-card ul {
  margin-inline: 22px;
}

.application-card h3 {
  margin-top: 22px;
}

.application-card ul {
  margin-bottom: 24px;
  padding-left: 19px;
}

.technical-table {
  width: min(100%, 920px);
  margin-inline: auto;
  border-collapse: collapse;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.technical-table th,
.technical-table td {
  padding: 18px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  text-align: left;
  vertical-align: top;
}

.technical-table th {
  width: 50%;
  font-weight: 700;
}

.technical-table td {
  color: #dfe5ea;
}

.technical-table tr:last-child th,
.technical-table tr:last-child td {
  border-bottom: 0;
}

.safety-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  width: min(100%, var(--max));
  margin-inline: auto;
  padding: clamp(20px, 3vw, 30px);
  background: var(--white);
  border: 1px solid var(--line);
}

.safety-panel ul {
  margin-bottom: 0;
  padding-left: 20px;
}

.download-card {
  display: grid;
  min-height: 180px;
  padding: 26px;
}

.download-card strong {
  font-size: 1.15rem;
}

.download-card:hover {
  border-color: var(--red);
}

.faq-list {
  display: grid;
  gap: 10px;
  max-width: 930px;
}

details {
  background: var(--white);
  border: 1px solid var(--line);
}

summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 750;
}

details p {
  padding: 0 22px 18px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: center;
}

.contact-panel {
  padding: 24px;
  color: var(--white);
  background: var(--ink);
}

.contact-panel p {
  display: grid;
  gap: 4px;
  margin-bottom: 18px;
}

.contact-panel strong {
  color: #aeb8c1;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.btn-wide {
  width: 100%;
  margin-top: 10px;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 30px;
  padding: 42px clamp(18px, 4vw, 52px);
  border-top: 1px solid var(--line);
}

.site-footer strong {
  font-size: 1.25rem;
}

.site-footer p {
  max-width: 760px;
  margin: 8px 0 0;
  font-size: 0.9rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
  font-weight: 700;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
}

.nav-toggle:focus-visible {
  outline-offset: 2px;
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .header-cta,
  .btn,
  .nav-dropdown-menu,
  .nav-dropdown-trigger::after,
  .site-header {
    transition: none;
  }
}

.internal-page .section {
  padding-block: clamp(42px, 6vw, 72px);
}

.internal-page .page-header-inner,
.internal-page .page-content,
.internal-page .page-content-grid,
.internal-page .property-grid,
.internal-page .section-heading {
  width: min(100%, var(--max));
  margin-inline: auto;
}

.internal-page .page-header {
  padding-block: clamp(40px, 6vw, 70px);
}

.internal-page .page-header h1 {
  max-width: 720px;
  margin-bottom: 14px;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
}

.internal-page .page-lead {
  max-width: 620px;
  margin: 0;
  color: var(--steel);
  font-size: clamp(1.02rem, 2vw, 1.2rem);
  line-height: 1.55;
}

.internal-page .page-content-prose {
  max-width: 820px;
}

.internal-page .page-content p,
.internal-page .content-block p {
  color: var(--muted);
  font-size: 1.03rem;
  line-height: 1.72;
}

.internal-page .page-content p + p,
.internal-page .content-block p + p {
  margin-top: 1rem;
}

.internal-page .intro-highlight {
  color: var(--ink) !important;
  font-size: clamp(1.15rem, 2.2vw, 1.35rem) !important;
  font-weight: 700;
  line-height: 1.5 !important;
}

.internal-page .discipline-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 1.1rem 0 1.6rem;
  padding: 0;
  list-style: none;
}

.internal-page .discipline-list li {
  padding: 8px 14px;
  color: var(--steel);
  font-size: 0.88rem;
  font-weight: 700;
  background: var(--paper);
  border: 1px solid var(--line);
}

.internal-page .science-notes {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 3vw, 24px);
  background: var(--paper);
  border: 1px solid var(--line);
}

.internal-page .science-notes p {
  margin: 0;
  font-size: 0.98rem;
}

.internal-page .science-notes strong {
  color: var(--ink);
}

.internal-page .page-content h2,
.internal-page .content-block h2,
.internal-page .highlight-panel h2 {
  margin-bottom: 14px;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.internal-page .page-content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 24px);
}

.internal-page .content-block {
  padding: clamp(22px, 3vw, 30px);
  background: var(--white);
  border: 1px solid var(--line);
}

.internal-page .content-block h2 {
  font-size: clamp(1.25rem, 2vw, 1.55rem);
}

.internal-page .equipment-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.internal-page .equipment-list li {
  padding: 12px 14px;
  color: var(--steel);
  font-size: 0.92rem;
  font-weight: 650;
  background: var(--paper);
  border-left: 3px solid var(--red);
  box-shadow: inset 0 0 0 1px var(--line);
}

.internal-page .content-list {
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  columns: 2;
  column-gap: 2.5rem;
}

.internal-page .check-list li {
  position: relative;
  margin-bottom: 0.65rem;
  padding-left: 28px;
  color: var(--muted);
  line-height: 1.55;
  break-inside: avoid;
}

.internal-page .check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--red);
  font-weight: 900;
}

.internal-page .property-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.internal-page .property-card {
  grid-column: span 2;
}

.internal-page .property-card:nth-child(4),
.internal-page .property-card:nth-child(5) {
  grid-column: span 3;
}

.internal-page .property-card span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--red);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.internal-page .property-card .spec-value {
  color: var(--ink);
  font-weight: 800;
}

.internal-page .highlight-panel {
  padding: clamp(22px, 4vw, 32px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--blueprint);
}

.internal-page .highlight-panel p {
  margin-bottom: 0;
}

.internal-page .highlight-panel-footer {
  margin-top: 1rem !important;
  padding-top: 1rem;
  color: var(--steel) !important;
  font-weight: 700;
  border-top: 1px solid var(--line);
}

.internal-page .notice-block {
  max-width: 820px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--white);
  border-left: 4px solid var(--red);
  box-shadow: inset 0 0 0 1px var(--line);
}

.internal-page .notice-block .eyebrow {
  margin-bottom: 8px;
}

.internal-page .notice-block p:last-child {
  margin: 0;
  color: var(--steel);
  font-weight: 650;
  line-height: 1.65;
}

.main-nav a[aria-current="page"] {
  color: var(--red);
}

@media (max-width: 1040px) {
  .site-header {
    grid-template-columns: auto auto;
  }

  .nav-toggle {
    display: block;
    justify-self: end;
  }

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

  .main-nav.is-open {
    display: grid;
    grid-column: 1 / -1;
    justify-self: stretch;
    gap: 0;
    padding: 8px 0 18px;
  }

  .main-nav.is-open a {
    padding: 12px 0;
    border-top: 1px solid var(--line);
  }

  .main-nav.is-open .nav-dropdown {
    border-top: 1px solid var(--line);
  }

  .main-nav.is-open .nav-dropdown-trigger {
    width: 100%;
    justify-content: space-between;
    padding: 12px 0;
  }

  .main-nav.is-open .nav-dropdown-menu {
    position: static;
    min-width: 0;
    padding: 0;
    border: 0;
    box-shadow: none;
    opacity: 1;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    transition: max-height 220ms ease, visibility 220ms ease;
  }

  .main-nav.is-open .nav-dropdown.is-open .nav-dropdown-menu {
    visibility: visible;
    max-height: 200px;
  }

  .main-nav.is-open .nav-dropdown-menu a {
    padding: 10px 0 10px 16px;
    border-top: 1px solid var(--line);
  }

  .main-nav.is-open .nav-mobile-cta {
    display: inline-flex;
    justify-content: center;
    margin-top: 14px;
    padding: 12px 20px;
    color: var(--white);
    background: var(--red);
    font-weight: 750;
    border-radius: 4px;
  }

  .main-nav.is-open .nav-mobile-cta:hover {
    background: var(--red-dark);
  }

  .hero,
  .section-grid,
  .grooved-layout,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .cards-grid,
  .applications-grid,
  .download-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .internal-page .page-content-grid {
    grid-template-columns: 1fr;
  }

  .internal-page .property-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .internal-page .property-card,
  .internal-page .property-card:nth-child(4),
  .internal-page .property-card:nth-child(5) {
    grid-column: auto;
  }
}

@media (max-width: 680px) {
  .section,
  .hero {
    padding-block: 58px;
  }

  .brand-text {
    display: none;
  }

  .hero-media {
    height: clamp(280px, 50vh, 480px);
  }

  h1 {
    line-height: 1.02;
  }

  .hero-highlights,
  .process-grid,
  .cards-grid,
  .applications-grid,
  .download-grid,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .technical-table,
  .technical-table tbody,
  .technical-table tr,
  .technical-table th,
  .technical-table td {
    display: block;
    width: 100%;
  }

  .technical-table th {
    padding-bottom: 6px;
    border-bottom: 0;
  }

  .technical-table td {
    padding-top: 0;
    padding-bottom: 18px;
  }

  .hero-actions,
  .safety-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .btn,
  .header-cta {
    width: 100%;
  }

  .benefit-card {
    min-height: auto;
  }

  .site-footer nav {
    justify-content: flex-start;
  }

  .internal-page .content-list {
    columns: 1;
  }

  .internal-page .page-content-grid {
    grid-template-columns: 1fr;
  }

  .internal-page .property-grid {
    grid-template-columns: 1fr;
  }

  .internal-page .property-card,
  .internal-page .property-card:nth-child(4),
  .internal-page .property-card:nth-child(5) {
    grid-column: auto;
  }
}