:root {
  --ink: #17202a;
  --muted: #5e6874;
  --line: #d9dee5;
  --soft: #f4f6f8;
  --steel: #31536b;
  --rust: #a83f2d;
  --deep: #0d1620;
  --white: #ffffff;
  --shadow: 0 18px 45px rgba(14, 29, 45, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
  background: var(--white);
}

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

img,
input,
select,
textarea,
button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 0 5vw;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: var(--white);
  font-weight: 700;
  background: var(--rust);
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  padding: 12px 14px;
  color: #344253;
  font-size: 14px;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--rust);
}

.main-nav .nav-cta {
  margin-left: 8px;
  color: var(--white);
  background: var(--steel);
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
  padding: 8px 10px;
  color: #344253;
  font-size: 13px;
  border: 1px solid var(--line);
  background: var(--white);
}

.language-switch span {
  color: var(--muted);
}

.language-select {
  min-width: 64px;
  color: var(--ink);
  border: 0;
  background: transparent;
  cursor: pointer;
}

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

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.section {
  padding: 92px 5vw;
}

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

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: calc(100vh - 76px);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  background-image: url("https://images.unsplash.com/photo-1581094288338-2314dddb7ece?auto=format&fit=crop&w=1800&q=80");
  background-position: center;
  background-size: cover;
  filter: saturate(0.78);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(9, 18, 28, 0.88), rgba(9, 18, 28, 0.56) 48%, rgba(9, 18, 28, 0.2)),
    linear-gradient(0deg, rgba(9, 18, 28, 0.48), transparent 40%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  padding: 80px 5vw 110px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--rust);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.section-dark .eyebrow {
  color: #f0b3a8;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(42px, 7vw, 82px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.1;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 14px;
  font-size: 23px;
  line-height: 1.2;
}

.hero-copy {
  max-width: 690px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 700;
}

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

.button-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.08);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 46px;
}

.trust-row span {
  padding: 10px 14px;
  color: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.07);
}

.quick-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.quick-card {
  min-height: 190px;
  padding: 28px;
  border-right: 1px solid var(--line);
}

.quick-card:last-child {
  border-right: 0;
}

.quick-card span {
  display: block;
  margin-bottom: 28px;
  color: var(--rust);
  font-weight: 700;
}

.quick-card strong,
.quick-card small {
  display: block;
}

.quick-card small {
  margin-top: 12px;
  color: var(--muted);
}

.quick-card:hover {
  background: var(--soft);
}

.value-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
  background: #101923;
}

.value-strip article {
  min-height: 250px;
  padding: 32px 28px;
  color: var(--white);
  border-right: 1px solid rgba(255, 255, 255, 0.13);
}

.value-strip article:last-child {
  border-right: 0;
}

.value-strip span {
  display: block;
  margin-bottom: 34px;
  color: #f0b3a8;
  font-weight: 700;
}

.value-strip strong {
  display: block;
  max-width: 280px;
  font-size: 22px;
  line-height: 1.18;
}

.value-strip p {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 540px);
  gap: 56px;
  align-items: start;
}

.intro p:last-child,
.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

.section-heading h2 {
  margin-bottom: 16px;
}

.products {
  background: var(--soft);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.product-card {
  display: grid;
  grid-template-columns: 42% 1fr;
  min-height: 360px;
  background: var(--white);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}

.product-card.featured {
  grid-column: span 2;
  grid-template-columns: 48% 1fr;
}

.product-image {
  min-height: 270px;
  background-position: center;
  background-size: cover;
}

.image-industrial {
  background-image: url("assets/products/industrial-valves.jpg");
}

.image-gas {
  background-image: url("assets/products/gas-control-valves.webp");
}

.image-special {
  background-image: url("assets/products/gas-system-valves.webp");
}

.image-fittings {
  background-image: url("assets/products/factory-workshop.jpg");
}

.product-content {
  padding: 34px;
}

.tier {
  margin: 0 0 10px;
  color: var(--rust);
  font-size: 13px;
  font-weight: 700;
}

.product-content p {
  color: var(--muted);
}

.product-content ul {
  margin: 20px 0 0;
  padding-left: 18px;
}

.product-content li {
  margin: 8px 0;
}

.catalog-block {
  margin-top: 46px;
  padding: 34px;
  background: var(--white);
  border: 1px solid var(--line);
}

.catalog-head {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(280px, 1fr);
  gap: 32px;
  align-items: end;
  margin-bottom: 28px;
}

.catalog-head h3 {
  margin: 0;
  font-size: clamp(26px, 3vw, 38px);
}

.catalog-head p:last-child {
  margin: 0;
  color: var(--muted);
}

.catalog-groups {
  display: grid;
  gap: 20px;
}

.catalog-group {
  border: 1px solid var(--line);
  background: #fbfcfd;
}

.catalog-title {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.catalog-title span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  color: var(--white);
  font-weight: 700;
  background: var(--steel);
}

.catalog-title h4 {
  margin: 0;
  font-size: 22px;
}

.catalog-table {
  display: grid;
}

.catalog-row {
  display: grid;
  grid-template-columns: 1.05fr 0.85fr 1.3fr 1.15fr 1.55fr;
  gap: 16px;
  align-items: start;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
}

.catalog-row:last-child {
  border-bottom: 0;
}

.catalog-row-head {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  background: #eef2f5;
}

.catalog-row strong {
  color: var(--ink);
}

.catalog-row span {
  color: var(--muted);
}

.catalog-link {
  display: inline-flex;
  margin: 0 24px 24px;
  padding: 11px 16px;
  color: var(--rust);
  font-weight: 700;
  border: 1px solid rgba(168, 63, 45, 0.28);
  background: var(--white);
}

.catalog-link:hover {
  color: var(--white);
  background: var(--rust);
}

.real-category-block {
  margin-top: 42px;
  padding: 34px;
  background: var(--white);
  border: 1px solid var(--line);
}

.real-category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.real-category-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 360px;
  background: #fbfcfd;
  border: 1px solid var(--line);
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

.real-category-card:hover {
  border-color: rgba(49, 83, 107, 0.42);
  box-shadow: 0 16px 36px rgba(14, 29, 45, 0.12);
  transform: translateY(-2px);
}

.real-category-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 0.86;
  object-fit: contain;
  padding: 20px;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.real-category-card div {
  display: grid;
  gap: 9px;
  align-content: start;
  padding: 18px;
}

.real-category-card h4 {
  margin: 0;
  color: #2f5590;
  font-size: 20px;
  line-height: 1.15;
}

.real-category-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.real-category-card span {
  align-self: end;
  color: var(--steel);
  font-weight: 700;
}

.visual-catalog {
  background: var(--white);
}

.visual-category {
  padding: 30px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background: #f8fafb;
}

.visual-category-head {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  margin-bottom: 22px;
}

.visual-category-head > span {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  color: var(--white);
  font-weight: 700;
  background: var(--rust);
}

.visual-category-head h3 {
  margin-bottom: 6px;
}

.visual-category-head p {
  max-width: 820px;
  margin: 0;
  color: var(--muted);
}

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

.visual-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 430px;
  background: var(--white);
  border: 1px solid var(--line);
}

.visual-card img {
  display: block;
  width: 100%;
  aspect-ratio: 900 / 620;
  object-fit: cover;
  background: var(--soft);
  border-bottom: 1px solid var(--line);
}

.visual-card div {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 20px;
}

.visual-card h4 {
  margin: 0;
  font-size: 19px;
  line-height: 1.2;
}

.visual-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.visual-card span {
  display: block;
  margin-top: 4px;
  padding-top: 12px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 700;
  border-top: 1px solid var(--line);
}

.standard-band {
  color: var(--white);
  background: var(--steel);
}

.standard-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 46px;
}

.standard-band .eyebrow {
  color: #d8edf8;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(255, 255, 255, 0.22);
}

.spec-grid div {
  padding: 24px;
  background: rgba(13, 22, 32, 0.2);
}

.spec-grid strong,
.spec-grid span {
  display: block;
}

.spec-grid span {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.78);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.solution-grid article {
  min-height: 300px;
  padding: 36px;
  border: 1px solid var(--line);
}

.solution-number {
  display: block;
  margin-bottom: 56px;
  color: var(--rust);
  font-weight: 700;
}

.solution-grid p,
.project-list p,
.about-content p,
.advantage span,
.site-footer span {
  color: var(--muted);
}

.solution-grid a {
  display: inline-block;
  margin-top: 14px;
  color: var(--rust);
  font-weight: 700;
}

.projects {
  background: #eef2f5;
}

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

.project-list article {
  min-height: 260px;
  padding: 28px;
  background: var(--white);
}

.project-list span {
  display: block;
  margin-bottom: 44px;
  color: var(--rust);
  font-size: 13px;
  font-weight: 700;
}

.about {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: center;
}

.about-poster {
  margin: 0;
  padding: 14px;
  background: #071321;
  box-shadow: var(--shadow);
}

.about-poster img {
  display: block;
  width: 100%;
  max-height: 760px;
  object-fit: contain;
  background: #071321;
}

.about-poster figcaption {
  margin: 12px 4px 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.about-content p {
  font-size: 17px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 32px 0;
  background: var(--line);
}

.stats div {
  padding: 22px;
  background: var(--soft);
}

.stats strong,
.stats span {
  display: block;
}

.stats strong {
  color: var(--rust);
  font-size: 36px;
  line-height: 1;
}

.stats span {
  margin-top: 8px;
  color: var(--muted);
}

.note {
  padding: 18px;
  border-left: 4px solid var(--rust);
  background: var(--soft);
}

.advantages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  padding-top: 0;
  background: var(--line);
}

.advantage {
  min-height: 190px;
  padding: 28px;
  background: var(--white);
}

.advantage strong,
.advantage span {
  display: block;
}

.advantage span {
  margin-top: 14px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 34px;
  color: var(--white);
  background: var(--deep);
}

.contact .eyebrow {
  color: #f0b3a8;
}

.contact-panel,
.quote-form {
  padding: 34px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.13);
}

.contact-panel p {
  color: rgba(255, 255, 255, 0.76);
}

.contact-details {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.contact-details span {
  padding-bottom: 12px;
  color: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.quote-form {
  display: grid;
  gap: 16px;
}

.quote-form label {
  display: grid;
  gap: 8px;
  color: rgba(255, 255, 255, 0.86);
  font-weight: 700;
}

.quote-form input,
.quote-form select,
.quote-form textarea {
  width: 100%;
  padding: 13px 14px;
  color: var(--ink);
  border: 1px solid transparent;
  background: var(--white);
}

.quote-form textarea {
  resize: vertical;
}

.form-message {
  min-height: 24px;
  margin: 0;
  color: #d8edf8;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 5vw;
  color: var(--white);
  background: #080e14;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.78);
}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 5vw 18px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav a {
    border-bottom: 1px solid var(--line);
  }

  .main-nav .nav-cta {
    margin: 10px 0 0;
    text-align: center;
  }

  .language-switch {
    justify-content: space-between;
    margin: 10px 0 0;
  }

  .quick-links,
  .value-strip,
  .product-grid,
  .solution-grid,
  .project-list,
  .advantages,
  .real-category-grid,
  .visual-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .intro,
  .standard-band,
  .catalog-head,
  .about,
  .contact {
    grid-template-columns: 1fr;
  }

  .product-card,
  .product-card.featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }

  .catalog-row {
    grid-template-columns: 1fr 1fr;
  }

  .catalog-row-head {
    display: none;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 0 18px;
  }

  .brand {
    min-width: 0;
  }

  .brand small {
    display: none;
  }

  .section {
    padding: 68px 18px;
  }

  .hero-content {
    padding: 70px 18px 88px;
  }

  h1 {
    font-size: 42px;
  }

  .quick-links,
  .value-strip,
  .product-grid,
  .catalog-row,
  .real-category-grid,
  .visual-grid,
  .spec-grid,
  .solution-grid,
  .project-list,
  .advantages,
  .stats {
    grid-template-columns: 1fr;
  }

  .quick-card {
    min-height: 150px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .catalog-block {
    padding: 20px;
  }

  .real-category-block {
    padding: 20px;
  }

  .catalog-title,
  .catalog-row {
    padding: 18px;
  }

  .catalog-link {
    margin: 0 18px 18px;
  }

  .visual-category {
    padding: 18px;
  }

  .visual-category-head {
    grid-template-columns: 1fr;
  }

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

  .about-poster {
    padding: 10px;
  }

  .about-poster img {
    max-height: none;
  }

  .site-footer {
    flex-direction: column;
  }
}