:root {
  --ink: #10223f;
  --muted: #65748b;
  --line: #d9e2ef;
  --paper: #ffffff;
  --white: #ffffff;
  --image-bg: #ffffff;
  --blue: #1458d4;
  --blue-dark: #0b2d75;
  --aqua: #28c3df;
  --steel: #ebf2fb;
  --shadow: 0 22px 70px rgba(16, 34, 63, 0.16);
  --header-h: 86px;
  --footer-h: 96px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-bottom: var(--footer-h);
  color: var(--ink);
  background: var(--white);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

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

button {
  font: inherit;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 30;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 72px);
  color: var(--white);
  transition: background 220ms ease, box-shadow 220ms ease, color 220ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 16px 45px rgba(16, 34, 63, 0.1);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 96px;
}

.brand-copy {
  display: grid;
  gap: 2px;
  line-height: 1;
}

.brand-copy strong {
  font-size: 18px;
  letter-spacing: 0.08em;
}

.brand-copy small {
  font-size: 13px;
  text-transform: uppercase;
  opacity: 0.72;
}

.fallback-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 17px;
  font-weight: 650;
}

.fallback-nav a {
  white-space: nowrap;
}

.nav-shell {
  position: absolute;
  left: 66.666%;
  transform: translateX(-50%);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  border: 0;
  color: inherit;
  background: transparent;
  padding: 32px 20px;
  cursor: pointer;
  font-size: 18px;
  font-weight: 650;
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 9px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg) translateY(-3px);
  transition: transform 180ms ease;
}

.nav-item:hover .nav-link::after,
.nav-item.is-active .nav-link::after {
  transform: rotate(225deg) translate(-2px, -1px);
}

.mega-panel {
  position: fixed;
  top: calc(var(--header-h) - 2px);
  left: 50%;
  width: min(1280px, calc(100vw - 48px));
  height: 360px;
  display: grid;
  grid-template-columns: 32% 41% 27%;
  gap: 0;
  padding: 0;
  color: var(--ink);
  background: var(--white);
  border-top: 3px solid var(--blue);
  box-shadow: 0 24px 70px rgba(16, 34, 63, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 12px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
}

.mega-panel-wide {
  width: min(1280px, calc(100vw - 48px));
}

.nav-item:hover .mega-panel,
.nav-item.is-active .mega-panel {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.mega-categories {
  padding: 18px 0;
  background: #f5f7fa;
}

.mega-category {
  position: relative;
  width: 100%;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 0;
  padding: 0 38px 0 28px;
  color: #2d405f;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font-size: 16px;
  font-weight: 560;
}

.mega-category::after {
  content: "";
  width: 8px;
  height: 8px;
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  transform: rotate(45deg);
}

.mega-category:hover,
.mega-category:focus-visible,
.mega-category.is-active {
  outline: 0;
  color: var(--blue);
  background: linear-gradient(90deg, #bfd4fa 0%, rgba(255, 255, 255, 0.65) 100%);
  font-weight: 750;
}

.mega-groups {
  padding: 20px 34px;
  border-right: 1px solid var(--line);
}

.mega-group {
  display: none;
}

.mega-group.is-active {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mega-preview {
  min-height: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--image-bg);
}

.mega-preview img {
  width: min(82%, 280px);
  height: min(82%, 260px);
  min-height: 0;
  display: block;
  object-fit: contain;
  padding: 0;
  background: var(--image-bg);
  transition: opacity 140ms ease, transform 200ms ease;
}

.mega-panel a {
  min-height: 42px;
  display: flex;
  align-items: center;
  padding: 9px 16px;
  border-left: 2px solid transparent;
  background: transparent;
  color: #263d63;
  font-size: 16px;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.mega-panel a:hover,
.mega-panel a:focus-visible,
.mega-panel a.is-previewed {
  outline: 0;
  color: var(--blue);
  border-color: var(--aqua);
  background: #edf5ff;
}

.empty-group,
.empty-preview,
.empty-catalog {
  min-height: 220px;
  background: var(--white);
}

.menu-toggle {
  display: none;
}

.hero {
  position: relative;
  min-height: 52vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: var(--white);
  background: #071733;
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.88) contrast(1.06);
  opacity: 0.64;
}

.hero-media picture,
.mega-preview picture,
.product-media picture,
.detail-image picture {
  display: block;
  width: 100%;
  height: 100%;
}

.catalog-brand picture {
  display: block;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(5, 17, 42, 0.92) 0%, rgba(5, 17, 42, 0.68) 42%, rgba(5, 17, 42, 0.2) 100%),
    linear-gradient(180deg, rgba(5, 17, 42, 0.35), rgba(5, 17, 42, 0.16));
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(920px, calc(100% - 40px));
  margin-left: clamp(20px, 8vw, 116px);
  padding-top: var(--header-h);
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--aqua);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
p {
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 5.2vw, 64px);
  line-height: 1.04;
  font-weight: 750;
}

.hero-brand-stack {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  font-size: clamp(32px, 4.4vw, 58px);
  line-height: 1.08;
}

.hero-company-title {
  max-width: 920px;
  color: var(--white);
  font-size: 54px;
  line-height: 1.18;
  text-shadow: 0 12px 34px rgba(0, 0, 0, 0.34);
}

.hero-brand-line {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 24px);
}

.hero-brand-logo {
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
  background: var(--white);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.2);
}

.hero-brand-logo-solid {
  width: clamp(70px, 7vw, 104px);
  height: clamp(70px, 7vw, 104px);
  padding: 7px;
}

.hero-brand-logo-hydrogen {
  width: clamp(112px, 12vw, 172px);
  height: clamp(52px, 5vw, 72px);
  padding: 8px 12px;
}

.hero-brand-slogan {
  min-width: 0;
  display: inline-flex;
  flex-wrap: wrap;
  color: var(--white);
  text-shadow: 0 12px 34px rgba(0, 0, 0, 0.34);
}

.hero-brand-slogan span {
  white-space: nowrap;
}

.hero-lede {
  max-width: 520px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  min-height: 46px;
  padding: 0 22px;
  font-weight: 700;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease;
}

.primary-action {
  color: var(--white);
  background: var(--blue);
}

.secondary-action {
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: var(--white);
}

.primary-action:hover,
.secondary-action:hover {
  transform: translateY(-2px);
}

.secondary-action:hover {
  color: var(--ink);
  background: var(--white);
}

.category-strip {
  position: relative;
  z-index: 4;
  width: min(1180px, calc(100% - 40px));
  margin: -54px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  box-shadow: var(--shadow);
}

.category-strip a {
  min-height: 136px;
  display: grid;
  align-content: center;
  gap: 9px;
  padding: 24px;
  border-right: 1px solid var(--line);
  transition: background 180ms ease, transform 180ms ease;
}

.category-strip a:last-child {
  border-right: 0;
}

.category-strip a:hover {
  background: #f1f7ff;
  transform: translateY(-4px);
}

.category-strip span {
  color: var(--blue);
  font-family: "Consolas", monospace;
  font-size: 13px;
}

.category-strip strong {
  font-size: 18px;
  line-height: 1.35;
}

.category-strip small {
  color: var(--muted);
}

.company-intro {
  width: min(1040px, calc(100% - 56px));
  margin: 64px auto 0;
}

.company-intro-inner {
  padding: 0;
}

.company-intro-copy h2 {
  margin: 0 0 28px;
  font-size: clamp(32px, 3.4vw, 46px);
  line-height: 1.12;
  text-align: center;
}

.company-intro-copy p {
  margin: 0;
  color: #2d405f;
  font-size: 17px;
  line-height: 1.9;
  text-align: left;
  text-indent: 2em;
}

.company-intro-copy p + p {
  margin-top: 14px;
}

.product-map {
  width: min(1480px, calc(100% - 56px));
  margin: 54px auto 0;
  padding-bottom: 88px;
  background: var(--white);
}

.product-center-heading {
  margin: 0 0 64px;
  text-align: center;
}

.product-center-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(34px, 3.6vw, 48px);
  line-height: 1.08;
  font-weight: 850;
}

.product-center-heading p {
  margin: 6px 0 0;
  color: var(--ink);
  font-size: 24px;
  line-height: 1.2;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(32px, 4vw, 50px);
  line-height: 1.15;
}

.section-heading p:last-child {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.catalog-module {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(34px, 5vw, 76px);
  min-height: 520px;
  margin-top: 44px;
}

.catalog-module + .catalog-module {
  margin-top: 86px;
}

.catalog-brand {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-width: 0;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.catalog-brand-copy {
  min-width: 0;
}

.catalog-brand-copy h3 {
  margin: 0;
  color: #000;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.18;
  font-weight: 850;
}

.catalog-brand-copy p {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.45;
}

.catalog-brand-copy p span:first-child {
  color: var(--blue-dark);
  font-size: 16px;
  font-weight: 800;
}

.catalog-brand-logo {
  flex: 0 0 auto;
  display: block;
  object-fit: contain;
  background: var(--white);
}

.catalog-brand-logo-hydrogen {
  width: clamp(126px, 13vw, 186px);
  height: clamp(42px, 5vw, 64px);
}

.catalog-brand-logo-solid {
  width: clamp(72px, 8vw, 106px);
  height: clamp(72px, 8vw, 106px);
}

.catalog-sidebar {
  padding-top: 6px;
}

.catalog-sidebar h3,
.catalog-sidebar h4 {
  position: relative;
  margin: 0 0 28px;
  color: #000;
  font-size: 26px;
  line-height: 1.2;
  font-weight: 850;
}

.catalog-sidebar h3::before,
.catalog-sidebar h4::before {
  content: "";
  display: block;
  width: 92px;
  height: 4px;
  margin-bottom: 9px;
  background: var(--blue);
}

.catalog-tabs {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.catalog-tab {
  border: 0;
  padding: 0;
  color: #0f1e35;
  background: transparent;
  cursor: pointer;
  text-align: left;
  font-size: 16px;
  line-height: 1.5;
}

.catalog-tab.is-active {
  outline: 0;
  color: var(--blue);
  font-weight: 750;
}

.catalog-tab:hover {
  color: #0f1e35;
}

.catalog-tab:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 4px;
}

.catalog-tab.is-active:hover {
  color: var(--blue);
}

.catalog-content {
  min-width: 0;
}

.catalog-content-fixed {
  min-height: 580px;
}

.catalog-content-solid-making {
  min-height: 580px;
}

.catalog-panel {
  display: none;
}

.catalog-panel.is-active {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 72px 54px;
}

.catalog-panel .product-card {
  box-shadow: none;
}

.catalog-panel .product-card:hover {
  box-shadow: 0 18px 42px rgba(16, 34, 63, 0.12);
}

.catalog-panel .product-media {
  aspect-ratio: 1.35 / 1;
  max-height: 190px;
}

.catalog-panel .product-card img {
  padding: 12px;
}

.catalog-panel .product-card > div:not(.product-media) {
  padding: 14px 10px 0;
}

.catalog-panel .product-card h4 {
  margin: 0;
  text-align: center;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 650;
}

.catalog-module-empty {
  min-height: 320px;
}

.product-family {
  scroll-margin-top: 110px;
  margin-top: 38px;
}

.family-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.family-title span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  color: var(--blue);
  background: #eaf2ff;
  font-weight: 800;
}

.family-title h3 {
  margin: 0;
  font-size: 25px;
}

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

.product-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.product-card {
  min-width: 0;
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--image-bg);
  border: 0;
  cursor: default;
  transition: transform 220ms ease, box-shadow 220ms ease;
  will-change: transform;
}

.product-card[data-detail] {
  cursor: pointer;
}

.product-card:hover {
  z-index: 3;
  transform: scale(1.025);
  box-shadow: 0 20px 48px rgba(16, 34, 63, 0.16);
}

.product-card:focus-visible {
  outline: 3px solid rgba(20, 88, 212, 0.46);
  outline-offset: 4px;
}

.product-card::before,
.product-card::after {
  content: "";
  position: absolute;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease, transform 200ms ease;
}

.product-card::before {
  right: -28px;
  bottom: -28px;
  z-index: 2;
  width: 74px;
  height: 74px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 12px 26px rgba(16, 34, 63, 0.2);
  transform: translate(10px, 10px) scale(0.9);
}

.product-card::after {
  right: 9px;
  bottom: 10px;
  z-index: 3;
  width: 24px;
  height: 24px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='10.5' cy='10.5' r='7'/%3E%3Cpath d='m16 16 5 5'/%3E%3C/svg%3E") center / 24px 24px no-repeat;
  transform: translate(10px, 10px) scale(0.9);
}

.product-card:hover::before,
.product-card:hover::after {
  opacity: 1;
  transform: translate(0, 0) scale(1);
}

.product-media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--image-bg);
}

.product-card img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  padding: 18px;
  background: var(--image-bg);
}

.product-card > div:not(.product-media) {
  padding: 20px 22px 24px;
}

.product-card span {
  color: var(--blue);
  font-family: "Consolas", monospace;
  font-size: 12px;
  font-weight: 700;
}

.product-card h4 {
  margin: 8px 0 9px;
  font-size: 19px;
  line-height: 1.35;
}

.product-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

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

.product-card.compact .product-media {
  aspect-ratio: 1.42 / 1;
}

.site-footer {
  position: fixed;
  inset: auto 0 0;
  z-index: 25;
  min-height: var(--footer-h);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 28px;
  padding: 30px clamp(20px, 5vw, 72px);
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

.footer-brand {
  display: grid;
  gap: 8px;
}

.footer-brand p {
  color: var(--ink);
  font-weight: 800;
}

.site-footer p,
.footer-brand p {
  margin: 0;
}

.footer-contact {
  grid-column: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  font-style: normal;
  font-weight: 750;
  color: var(--ink);
}

.footer-phone-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 2px solid var(--blue);
  border-radius: 50%;
  color: var(--blue);
  font-size: 22px;
  line-height: 1;
}

.footer-phone-list {
  display: grid;
  gap: 8px;
}

.footer-contact a {
  display: block;
  white-space: nowrap;
}

.footer-records {
  justify-self: end;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 14px;
  font-size: 13px;
  line-height: 1.5;
}

.footer-records a {
  color: var(--muted);
}

.footer-records a:hover {
  color: var(--blue);
}

.detail-page .site-header {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 16px 45px rgba(16, 34, 63, 0.08);
  backdrop-filter: blur(16px);
}

.product-detail {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: calc(var(--header-h) + 38px) 0 88px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.breadcrumb a {
  color: var(--blue);
  font-weight: 700;
}

.detail-hero {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 68px);
  align-items: start;
  margin-bottom: 64px;
}

.detail-image {
  min-height: 360px;
  display: grid;
  place-items: center;
  background: var(--image-bg);
}

.detail-image img {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
}

.detail-summary h1 {
  color: var(--ink);
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.1;
}

.summary-copy {
  margin-top: 24px;
  display: grid;
  gap: 14px;
  color: #334867;
  font-size: 17px;
  line-height: 1.9;
}

.summary-copy p {
  margin: 0;
}

.detail-section {
  scroll-margin-top: 110px;
  margin-top: 56px;
}

.compact-heading {
  margin-bottom: 18px;
}

.compact-heading h2 {
  font-size: clamp(28px, 3vw, 42px);
}

.parameter-table-wrap {
  overflow: auto;
  border-top: 2px solid var(--ink);
}

.parameter-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
}

.parameter-table th,
.parameter-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}

.parameter-table th {
  width: 260px;
  color: var(--ink);
  background: #f6f9fd;
  font-weight: 750;
}

.parameter-table td {
  color: #2d405f;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.feature-item {
  min-width: 0;
  padding: 22px 24px;
  background: #f6f9fd;
  border-top: 3px solid var(--blue);
}

.feature-item h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.3;
}

.feature-item p {
  margin: 0;
  color: #334867;
  font-size: 15px;
  line-height: 1.75;
}

.parameter-table .parameter-section th {
  width: auto;
  color: var(--blue);
  background: #edf5ff;
  font-weight: 800;
}

.fixture-comparison-table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 16px;
}

.fixture-comparison-table th,
.fixture-comparison-table td {
  border: 1px solid var(--line);
  padding: 16px 18px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}

.fixture-comparison-table th {
  width: 28%;
  color: var(--ink);
  background: #f6f9fd;
  font-weight: 750;
}

.fixture-comparison-table td {
  width: 24%;
  color: #2d405f;
}

.fixture-comparison-table .fixture-model-row th,
.fixture-comparison-table .fixture-model-row td {
  background: #edf5ff;
  font-weight: 400;
}

.fixture-comparison-table tr:last-child th,
.fixture-comparison-table tr:last-child td {
  line-height: 1.7;
}

@media (max-width: 1080px) {
  .site-header {
    padding: 0 22px;
  }

  .fallback-nav {
    gap: 16px;
    font-size: 15px;
  }

  .nav-link {
    padding-inline: 12px;
    font-size: 16px;
  }

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

  .catalog-panel.is-active {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .catalog-content-solid-making {
    min-height: 834px;
  }
}

@media (max-width: 820px) {
  :root {
    --header-h: 72px;
    --footer-h: 112px;
  }

  .menu-toggle {
    display: inline-grid;
    place-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    border: 1px solid currentColor;
    color: inherit;
    background: transparent;
  }

  .menu-toggle span {
    width: 18px;
    height: 2px;
    background: currentColor;
  }

  .nav-shell {
    position: fixed;
    top: var(--header-h);
    right: 0;
    left: 0;
    max-height: calc(100vh - var(--header-h));
    overflow: auto;
    padding: 12px 20px 24px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.98);
    opacity: 0;
    visibility: hidden;
    transform: translateY(calc(-100% - var(--header-h)));
    transition: opacity 180ms ease, transform 220ms ease, visibility 220ms ease;
    box-shadow: 0 24px 50px rgba(16, 34, 63, 0.12);
    pointer-events: none;
  }

  .fallback-nav {
    max-width: calc(100vw - 138px);
    gap: 12px;
    overflow-x: auto;
    font-size: 13px;
  }

  .nav-shell.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    display: grid;
    gap: 8px;
  }

  .nav-link {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: #f3f7fc;
  }

  .mega-panel,
  .mega-panel-wide {
    position: static;
    inset: auto;
    width: 100%;
    max-width: none;
    height: auto;
    display: none;
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    margin: 0;
    padding: 8px 0 0;
    box-shadow: none;
    border: 0;
    opacity: 1;
    visibility: visible;
    transform: none !important;
  }

  .nav-item:last-child .mega-panel,
  .nav-item:last-child:hover .mega-panel,
  .nav-item:last-child.is-active .mega-panel {
    left: auto;
    right: auto;
    transform: none !important;
  }

  .nav-item.is-active .mega-panel {
    display: grid;
  }

  .mega-preview {
    display: none;
  }

  .mega-categories {
    padding: 0;
    background: transparent;
  }

  .mega-category {
    min-height: 46px;
    padding: 12px 16px;
    background: #f8fbff;
  }

  .mega-groups {
    padding: 0;
    border-right: 0;
  }

  .mega-group.is-active {
    gap: 6px;
  }

  .mega-panel a {
    width: 100%;
    min-width: 0;
    min-height: 46px;
    padding: 12px 16px 12px 28px;
    background: #f5f8fd;
    overflow-wrap: anywhere;
  }

  .hero {
    min-height: 50vh;
  }

  .hero-content {
    margin-inline: 20px;
    width: calc(100% - 40px);
  }

  .hero-brand-stack {
    gap: 18px;
    font-size: clamp(28px, 8vw, 36px);
    line-height: 1.18;
  }

  .hero-company-title {
    max-width: 100%;
    font-size: 34px;
    line-height: 1.28;
  }

  .hero-brand-line {
    align-items: flex-start;
    gap: 14px;
  }

  .hero-brand-logo-solid {
    width: 64px;
    height: 64px;
    padding: 6px;
  }

  .hero-brand-logo-hydrogen {
    width: 96px;
    height: 48px;
    padding: 7px 9px;
  }

  .category-strip,
  .product-grid,
  .product-grid.two,
  .fixture-grid,
  .catalog-module,
  .detail-hero {
    grid-template-columns: 1fr;
  }

  .company-intro {
    width: min(100% - 40px, 620px);
    margin-top: 34px;
  }

  .product-map {
    width: min(100% - 40px, 620px);
    margin-top: 34px;
  }

  .product-center-heading {
    margin-bottom: 38px;
  }

  .catalog-brand {
    align-items: flex-start;
    gap: 18px;
    padding-bottom: 18px;
  }

  .catalog-brand-copy h3 {
    font-size: clamp(24px, 7vw, 32px);
  }

  .catalog-brand-copy p {
    display: grid;
    gap: 4px;
    font-size: 14px;
  }

  .catalog-brand-copy p span:first-child {
    font-size: 15px;
  }

  .catalog-brand-logo-hydrogen {
    width: 108px;
    height: 42px;
  }

  .catalog-brand-logo-solid {
    width: 62px;
    height: 62px;
  }

  .catalog-module {
    gap: 22px;
    min-height: 0;
  }

  .catalog-panel.is-active {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 18px;
  }

  .catalog-content-hydrogen {
    min-height: 706px;
  }

  .catalog-content-solid-making {
    min-height: 954px;
  }

  .catalog-panel .product-media {
    max-height: 150px;
  }

  .product-detail {
    width: min(100% - 40px, 620px);
    padding-top: calc(var(--header-h) + 24px);
  }

  .detail-image {
    min-height: 240px;
  }

  .detail-image img {
    max-height: 300px;
  }

  .parameter-table th,
  .parameter-table td {
    display: block;
    width: 100%;
  }

  .parameter-table th {
    padding-bottom: 6px;
  }

  .parameter-table td {
    padding-top: 6px;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .fixture-comparison-table th,
  .fixture-comparison-table td {
    display: table-cell;
    width: auto;
  }

  .fixture-comparison-table {
    font-size: 16px;
  }

  .category-strip {
    margin-top: 0;
    width: 100%;
  }

  .category-strip a {
    min-height: 108px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .site-footer {
    display: grid;
    grid-template-columns: 1fr;
    align-items: start;
    gap: 12px;
    padding-block: 16px;
  }

  .footer-contact {
    grid-column: 1;
    justify-content: flex-start;
  }

  .footer-records {
    justify-self: start;
    justify-content: flex-start;
  }

  .footer-phone-icon {
    width: 34px;
    height: 34px;
    font-size: 18px;
  }

  .footer-phone-list {
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}