:root {
  --brand-blue: #004077;
  --brand-blue-dark: #002b55;
  --brand-red: #d0021b;
  --ink: #17202a;
  --muted: #5c6b78;
  --line: #d9e0e8;
  --surface: #f4f7fa;
  --surface-strong: #e8edf2;
  --white: #fff;
  --shadow: 0 18px 42px rgba(23, 32, 42, 0.12);
  --header-height: 76px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.65;
}

body.nav-open {
  overflow: hidden;
}

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

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

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

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

.container {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 0 32px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand img {
  width: 208px;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: #293949;
  font-size: 15px;
}

.site-nav a {
  position: relative;
  padding: 26px 0;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 18px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--brand-blue);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--brand-blue);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: calc(100svh - var(--header-height) - 110px);
  max-height: 690px;
  padding: 88px 0;
  overflow: hidden;
  color: var(--white);
  background: var(--brand-blue-dark);
  scroll-margin-top: var(--header-height);
}

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

.hero-media {
  background-image: url("assets/hero-poloplast-manufacturing.jpg");
  background-position: center;
  background-size: cover;
  transform: scale(1.02);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(0, 32, 62, 0.9) 0%, rgba(0, 44, 84, 0.76) 43%, rgba(0, 64, 119, 0.28) 100%),
    rgba(0, 28, 50, 0.22);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(780px, calc(100% - 48px));
  margin: 0 auto;
  margin-left: max(24px, calc((100% - 1160px) / 2));
}

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

.hero .eyebrow {
  color: #dceeff;
}

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

h1,
h2,
h3 {
  line-height: 1.18;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: 48px;
  font-weight: 800;
}

h2 {
  margin: 0 0 18px;
  color: var(--brand-blue-dark);
  font-size: 34px;
}

h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 19px;
}

.hero-lead {
  max-width: 720px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 19px;
}

.hero-actions,
.download-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.btn,
.download-list button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  color: var(--brand-blue);
  font-weight: 700;
  border: 1px solid var(--brand-blue);
  border-radius: 6px;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.btn:hover,
.btn:focus-visible,
.download-list button:hover,
.download-list button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0, 64, 119, 0.16);
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--brand-blue-dark);
}

.btn-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.72);
}

.section {
  padding: 60px 0;
  scroll-margin-top: calc(var(--header-height) + 18px);
}

.trust-band {
  padding: 28px 0;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px 22px;
}

.trust-item {
  min-height: 76px;
  padding: 14px 0;
  border-left: 3px solid var(--brand-blue);
}

.trust-item strong,
.trust-item span {
  display: block;
  padding-left: 18px;
}

.trust-item strong {
  color: var(--brand-blue);
  font-size: 20px;
  line-height: 1.2;
}

.trust-item span {
  color: var(--muted);
  font-size: 14px;
}

.product-section,
.downloads-section {
  background: var(--surface);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 56px;
  align-items: center;
}

.split-reverse {
  grid-template-columns: minmax(320px, 0.86fr) minmax(0, 1.14fr);
}

.section-copy p {
  max-width: 680px;
  margin: 0 0 18px;
  color: var(--muted);
}

.feature-list {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.product-system-layout {
  display: grid;
  gap: 28px;
}

.product-heading {
  max-width: 880px;
  margin-bottom: 0;
}

.product-system-layout .product-figure {
  width: min(760px, 100%);
  margin: 0 auto;
}

.product-feature-grid {
  grid-template-columns: repeat(3, 1fr);
  margin-top: 0;
}

.product-feature-grid article {
  min-height: 152px;
}

.feature-list article,
.scenario-card,
.case-card,
.lead-form,
.download-list button {
  border-radius: 8px;
}

.feature-list article {
  padding: 20px 22px;
  background: var(--white);
  border: 1px solid var(--line);
}

.feature-list p,
.scenario-card p,
.case-card span {
  margin: 0;
  color: var(--muted);
}

.product-figure {
  margin: 0;
  padding: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.product-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
}

#products .split {
  align-items: stretch;
}

#products .product-figure {
  display: flex;
  flex-direction: column;
}

#products .product-figure img {
  flex: 1;
  min-height: 0;
}

.product-figure figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

.product-figure.compact img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.brand-manufacturing-section {
  padding-bottom: 24px;
  background: var(--white);
}

.brand-manufacturing-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.brand-media {
  margin: 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 36px rgba(23, 32, 42, 0.1);
}

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

.brand-media-panorama img {
  aspect-ratio: 5 / 1;
  object-position: center;
}

.brand-media figcaption {
  padding: 12px 16px;
  color: var(--muted);
  font-size: 13px;
}

.brand-copy p {
  max-width: 620px;
  margin: 0 0 18px;
  color: var(--muted);
}

.brand-points {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 0;
}

.brand-points article {
  min-height: 118px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand-blue);
  border-radius: 8px;
}

.brand-points strong,
.brand-points span {
  display: block;
}

.brand-points strong {
  margin-bottom: 6px;
  color: var(--brand-blue);
  font-size: 16px;
}

.brand-points span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
}

.scenarios-section {
  padding-top: 24px;
  padding-bottom: 30px;
}

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

.scenario-card {
  overflow: hidden;
  min-height: 210px;
  padding: 0;
  background: var(--white);
  border: 1px solid var(--line);
}

.scenario-card img {
  width: 100%;
  aspect-ratio: 16 / 4.5;
  object-fit: cover;
}

.scenario-card-body {
  padding: 18px 22px 20px;
}

.scenario-card h3 {
  color: var(--brand-blue);
}

.cases-section {
  padding-top: 24px;
  background: var(--white);
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.case-card {
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 12px 28px rgba(23, 32, 42, 0.08);
}

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

.case-card div {
  padding: 20px;
}

.case-card p {
  display: inline-flex;
  margin: 0 0 10px;
  padding: 3px 9px;
  color: var(--brand-blue);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.case-name-cn {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.download-list button {
  background: var(--white);
}

.product-figure.compact {
  padding: 8px;
  border-width: 1px;
  box-shadow: none;
}

.contact-section {
  color: var(--white);
  background: var(--brand-blue-dark);
}

.contact-section h2,
.contact-section .eyebrow {
  color: var(--white);
}

.contact-section p {
  color: rgba(255, 255, 255, 0.78);
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.8fr);
  gap: 56px;
  align-items: start;
}

.contact-methods {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.contact-methods p {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
}

.contact-methods strong {
  color: var(--white);
}

.lead-form {
  display: grid;
  gap: 16px;
  padding: 26px;
  color: var(--ink);
  background: var(--white);
}

.lead-form label {
  display: grid;
  gap: 7px;
  color: var(--brand-blue-dark);
  font-weight: 700;
}

.lead-form input,
.lead-form select,
.lead-form textarea {
  width: 100%;
  padding: 12px 13px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.lead-form input:focus,
.lead-form select:focus,
.lead-form textarea:focus {
  outline: 2px solid rgba(0, 64, 119, 0.24);
  border-color: var(--brand-blue);
}

.form-status {
  margin: 0;
  padding: 12px 14px;
  color: var(--brand-blue-dark);
  background: #edf7f1;
  border: 1px solid #c7e8d2;
  border-radius: 6px;
}

.download-status {
  margin: 18px 0 0;
  padding: 12px 14px;
  color: var(--brand-blue-dark);
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand-blue);
  border-radius: 6px;
}

.product-link {
  margin-top: 8px;
}

.product-figure .product-link {
  display: flex;
  width: fit-content;
  margin: 16px auto 4px;
}

.product-detail-hero {
  position: relative;
  min-height: calc(100svh - var(--header-height));
  color: var(--white);
  background-image: url("assets/product-display.png");
  background-position: center;
  background-size: cover;
}

.product-detail-hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 36, 72, 0.88) 0%, rgba(0, 52, 96, 0.76) 42%, rgba(0, 64, 119, 0.36) 100%),
    linear-gradient(180deg, rgba(0, 28, 50, 0.2) 0%, rgba(0, 28, 50, 0.38) 100%);
}

.product-detail-hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: calc(100svh - var(--header-height));
  flex-direction: column;
  justify-content: center;
  padding: 82px 0;
}

.product-detail-hero .eyebrow {
  color: #dceeff;
}

.product-detail-hero h1 {
  max-width: 760px;
  color: var(--white);
  font-size: 56px;
}

.product-detail-lead {
  max-width: 720px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 19px;
}

.product-fact-strip {
  padding: 22px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

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

.product-fact-grid article {
  padding-left: 18px;
  border-left: 3px solid var(--brand-blue);
}

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

.product-fact-grid strong {
  color: var(--brand-blue);
  line-height: 1.35;
}

.product-fact-grid span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.product-anchorbar {
  position: sticky;
  top: var(--header-height);
  z-index: 30;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.product-anchorbar .container {
  display: flex;
  gap: 24px;
  overflow-x: auto;
}

.product-anchorbar a {
  flex: 0 0 auto;
  padding: 15px 0;
  color: var(--brand-blue);
  font-weight: 700;
  font-size: 14px;
}

.detail-section {
  background: var(--white);
}

.detail-section-blue,
.documents-detail-section {
  background: var(--surface);
}

.detail-intro-grid,
.detail-media-grid,
.documents-layout,
.detail-cta-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.86fr);
  gap: 56px;
  align-items: center;
}

.detail-media-grid {
  grid-template-columns: minmax(0, 0.94fr) minmax(360px, 0.96fr);
  gap: 48px;
  align-items: start;
}

.detail-overview-list {
  display: grid;
  gap: 16px;
}

.detail-overview-list article,
.detail-card,
.application-path-list article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.detail-overview-list article {
  padding: 22px;
  border-left: 4px solid var(--brand-blue);
}

.detail-overview-list strong,
.detail-overview-list span {
  display: block;
}

.detail-overview-list strong {
  color: var(--brand-blue);
  font-size: 22px;
  line-height: 1.25;
}

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

.detail-product-figure {
  overflow: hidden;
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

#parameters .detail-product-figure {
  align-self: end;
}

.detail-product-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.detail-product-figure figcaption {
  padding: 12px 18px 14px;
  color: var(--muted);
  font-size: 14px;
}

.layer-list {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.layer-list article {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.layer-list span {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 800;
  background: var(--brand-blue);
  border-radius: 50%;
}

.layer-list p,
.detail-card p,
.application-path-list p,
.detail-cta p {
  margin: 0;
  color: var(--muted);
}

.spec-table {
  display: grid;
  margin-top: 18px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.spec-table div {
  display: grid;
  grid-template-columns: minmax(120px, 0.34fr) 1fr;
  gap: 18px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
}

.spec-table div:last-child {
  border-bottom: 0;
}

.spec-table strong {
  color: var(--brand-blue);
}

.spec-table span {
  color: var(--muted);
}

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

.detail-card {
  min-height: 188px;
  padding: 24px;
}

.detail-card h3,
.application-path-list h3 {
  color: var(--brand-blue);
}

.sound-evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.sound-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand-blue);
  border-radius: 8px;
}

.sound-card h3 {
  color: var(--brand-blue);
}

.sound-card p {
  margin: 0 0 18px;
  color: var(--muted);
}

.certificate-preview-card {
  overflow: hidden;
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand-blue);
  border-radius: 8px;
}

.certificate-preview-card img {
  width: 100%;
  aspect-ratio: 16 / 7.4;
  object-fit: cover;
}

.certificate-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.certificate-card {
  overflow: hidden;
  margin: 0;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 14px 30px rgba(23, 32, 42, 0.08);
}

.certificate-card img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

.certificate-card figcaption {
  min-height: 48px;
  padding: 10px 12px 12px;
  color: var(--brand-blue);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.35;
  border-top: 1px solid var(--line);
}

.sound-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  color: var(--ink);
  font-size: 14px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.sound-table th,
.sound-table td {
  padding: 10px 9px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}

.sound-table th:first-child,
.sound-table td:first-child {
  color: var(--brand-blue);
  font-weight: 800;
  text-align: left;
}

.sound-table tr:last-child td {
  border-bottom: 0;
}

.technical-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.performance-grid {
  margin-top: 28px;
}

.applications-detail-section {
  padding-top: 16px;
  background: var(--white);
}

.application-path-list {
  display: grid;
  gap: 14px;
}

.application-path-list article {
  display: grid;
  grid-template-columns: 58px 1fr 148px;
  gap: 18px;
  align-items: center;
  padding: 18px 22px;
}

.application-path-list article.without-image {
  grid-template-columns: 58px 1fr;
}

.application-path-list span {
  color: var(--brand-blue);
  font-weight: 800;
  letter-spacing: 0;
}

.application-path-list img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 6px;
}

.case-context-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.case-context-grid article {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.case-context-grid img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.case-context-grid div {
  padding: 14px 16px 16px;
}

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

.case-context-grid strong {
  color: var(--brand-blue);
}

.case-context-grid span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.documents-layout {
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
}

.documents-layout-single {
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.34fr);
  align-items: center;
}

.documents-layout-single .section-copy {
  max-width: 680px;
}

.document-action-panel {
  display: flex;
  justify-content: flex-end;
}

.document-panel {
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.document-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.document-grid button,
.document-grid a {
  display: flex;
  min-height: 52px;
  align-items: center;
  padding: 12px 14px;
  color: var(--brand-blue);
  font-weight: 700;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.document-grid button:disabled {
  cursor: default;
  opacity: 1;
}

.document-grid button span {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.document-grid button:hover,
.document-grid button:focus-visible,
.document-grid a:hover,
.document-grid a:focus-visible {
  background: var(--white);
  box-shadow: 0 10px 24px rgba(0, 64, 119, 0.12);
  transform: translateY(-1px);
}

.document-grid button:disabled:hover {
  background: var(--surface);
  box-shadow: none;
  transform: none;
}

.document-request-link {
  margin-top: 8px;
}

.technical-installation-page .technical-hero {
  min-height: 72svh;
  background-image: url("assets/hero-installation-guide-lowered.jpg");
  background-position: center 62%;
}

.technical-installation-page .product-detail-hero-shade {
  background:
    linear-gradient(90deg, rgba(0, 36, 72, 0.92) 0%, rgba(0, 52, 96, 0.8) 42%, rgba(0, 64, 119, 0.36) 100%),
    linear-gradient(180deg, rgba(0, 28, 50, 0.28) 0%, rgba(0, 28, 50, 0.52) 100%);
}

.technical-installation-page .product-detail-hero-content {
  min-height: 72svh;
}

.technical-installation-page .product-detail-hero h1 {
  max-width: 820px;
  font-size: 54px;
}

.installation-overview-grid {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.installation-overview-grid article,
.installation-step-grid article,
.installation-table-card,
.installation-note-panel,
.test-check-grid article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.installation-overview-grid article {
  padding: 18px 20px;
  border-left: 4px solid var(--brand-blue);
}

.installation-overview-grid strong,
.installation-overview-grid span,
.secure-system-list strong,
.secure-system-list span,
.test-check-grid strong,
.test-check-grid span {
  display: block;
}

.installation-overview-grid strong,
.secure-system-list strong,
.test-check-grid strong {
  color: var(--brand-blue);
}

.installation-overview-grid span,
.secure-system-list span,
.test-check-grid span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.installation-visual-card {
  box-shadow: 0 14px 34px rgba(23, 32, 42, 0.1);
}

.installation-visual-card img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--white);
}

.installation-step-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.installation-step-grid article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.36fr);
  min-height: 188px;
  align-items: stretch;
  overflow: hidden;
}

.installation-step-visual {
  grid-column: 2;
  grid-row: 1;
  width: 100%;
  height: 100%;
  min-height: 188px;
  max-height: 188px;
  aspect-ratio: auto;
  padding: 14px;
  object-fit: contain;
  background: var(--white);
  border-bottom: 0;
  border-left: 1px solid var(--line);
}

.installation-step-copy {
  display: grid;
  grid-column: 1;
  grid-row: 1;
  grid-template-columns: 52px 1fr;
  gap: 18px;
  align-content: center;
  padding: 24px 28px;
}

.installation-step-grid span {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 800;
  background: var(--brand-blue);
  border-radius: 50%;
}

.installation-step-copy h3,
.installation-step-copy p {
  grid-column: 2;
}

.installation-step-grid h3,
.installation-table-card h3 {
  margin: 0 0 8px;
  color: var(--brand-blue);
}

.installation-step-grid p {
  margin: 0;
  color: var(--muted);
}

.installation-table-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 22px;
}

.installation-table-card {
  min-width: 0;
  padding: 24px;
}

.installation-table-card h3 {
  margin-top: 0;
}

.install-table {
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.install-table div {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  border-bottom: 1px solid var(--line);
}

.install-table div:last-child {
  border-bottom: 0;
}

.install-table strong,
.install-table span {
  padding: 10px 12px;
  border-right: 1px solid var(--line);
}

.install-table strong:last-child,
.install-table span:last-child {
  border-right: 0;
}

.install-table strong {
  color: var(--brand-blue);
  background: var(--surface);
}

.install-table span {
  color: var(--muted);
  font-size: 14px;
}

.secure-system-list {
  display: grid;
  gap: 14px;
}

.secure-system-list article {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.secure-system-list article:first-child {
  padding-top: 0;
  border-top: 0;
}

.installation-note-panel {
  display: grid;
  grid-template-columns: minmax(140px, 0.22fr) 1fr;
  gap: 18px;
  align-items: center;
  margin-top: 20px;
  padding: 18px 22px;
  background: var(--surface);
  border-left: 4px solid var(--brand-blue);
}

.installation-note-panel strong {
  color: var(--brand-blue);
}

.installation-note-panel span {
  color: var(--muted);
}

.test-check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.technical-installation-page #testing .detail-product-figure img {
  object-fit: contain;
  background: var(--white);
}

.test-check-grid article {
  padding: 18px;
}

.detail-cta {
  padding: 56px 0;
  color: var(--white);
  background: var(--brand-blue-dark);
}

.detail-cta .eyebrow,
.detail-cta h2 {
  color: var(--white);
}

.detail-cta-layout {
  grid-template-columns: minmax(0, 1fr) auto;
}

.site-footer {
  padding: 24px 0;
  color: var(--muted);
  background: var(--surface-strong);
}

.footer-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-layout p {
  margin: 0;
}

.footer-layout a {
  color: var(--brand-blue);
  font-weight: 700;
}

@media (max-width: 980px) {
  .site-header {
    padding: 0 22px;
  }

  .site-nav {
    gap: 16px;
    font-size: 14px;
  }

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

  .scenario-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .split,
  .split-reverse,
  .brand-manufacturing-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .product-figure {
    max-width: 560px;
  }

  .product-fact-grid,
  .detail-card-grid,
  .sound-evidence-grid,
  .test-check-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .installation-table-grid {
    grid-template-columns: 1fr;
  }

  .certificate-wall {
    grid-template-columns: repeat(4, 1fr);
  }

  .detail-intro-grid,
  .detail-media-grid,
  .documents-layout,
  .detail-cta-layout {
    grid-template-columns: 1fr;
  }

  .application-path-list article {
    grid-template-columns: 48px 1fr 128px;
  }

  .application-path-list article.without-image {
    grid-template-columns: 48px 1fr;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 68px;
  }

  .container {
    width: min(100% - 32px, 640px);
  }

  .site-header {
    min-height: var(--header-height);
    padding: 0 16px;
  }

  .brand img {
    width: 176px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: grid;
    gap: 0;
    padding: 10px 16px 22px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    transform: translateY(-130%);
    transition: transform 180ms ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
  }

  .site-nav a {
    padding: 14px 4px;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    min-height: calc(100svh - var(--header-height) - 86px);
    max-height: none;
    padding: 64px 0;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(0, 36, 72, 0.88) 0%, rgba(0, 45, 83, 0.74) 62%, rgba(0, 64, 119, 0.46) 100%),
      rgba(0, 28, 50, 0.16);
  }

  .hero-content {
    width: min(100% - 32px, 640px);
    margin: 0 auto;
  }

  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 27px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .section {
    padding: 46px 0;
  }

  .brand-manufacturing-section {
    padding-bottom: 24px;
  }

  .scenarios-section {
    padding-top: 18px;
    padding-bottom: 30px;
  }

  .cases-section {
    padding-top: 18px;
    padding-bottom: 38px;
  }

  .downloads-section {
    padding-top: 36px;
  }

  .section-heading {
    margin-bottom: 24px;
  }

  .scenario-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .trust-band {
    padding: 18px 0;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 12px;
  }

  .trust-item {
    min-height: 78px;
    padding: 10px 0;
  }

  .trust-item strong,
  .trust-item span {
    padding-left: 12px;
  }

  .trust-item strong {
    font-size: 16px;
  }

  .trust-item span {
    font-size: 12px;
    line-height: 1.45;
  }

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

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

  .product-feature-grid article {
    min-height: auto;
  }

  .brand-points {
    grid-template-columns: 1fr;
  }

  .brand-points article {
    min-height: auto;
  }

  .hero-actions,
  .download-list {
    display: grid;
  }

  .btn,
  .download-list button {
    width: 100%;
  }

  .product-figure .product-link {
    width: 100%;
  }

  .product-figure,
  .lead-form {
    padding: 20px;
  }

  .product-detail-hero,
  .product-detail-hero-content {
    min-height: calc(100svh - var(--header-height));
  }

  .product-detail-hero {
    background-position: 55% center;
  }

  .product-detail-hero-content {
    padding: 64px 0;
  }

  .product-detail-hero h1 {
    font-size: 34px;
  }

  .technical-installation-page .technical-hero,
  .technical-installation-page .product-detail-hero-content {
    min-height: calc(100svh - var(--header-height));
  }

  .product-detail-lead {
    font-size: 17px;
  }

  .brand-media-panorama img {
    aspect-ratio: 3 / 1;
  }

  .product-fact-grid,
  .detail-card-grid,
  .sound-evidence-grid,
  .test-check-grid,
  .case-context-grid,
  .document-grid {
    grid-template-columns: 1fr;
  }

  .installation-step-grid article {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .installation-step-visual {
    grid-column: 1;
    grid-row: 1;
    height: auto;
    min-height: 0;
    max-height: none;
    aspect-ratio: 16 / 9;
    border-bottom: 1px solid var(--line);
    border-left: 0;
  }

  .installation-step-copy {
    grid-column: 1;
    grid-row: 2;
    grid-template-columns: 42px 1fr;
    gap: 14px;
    padding: 20px;
  }

  .certificate-wall {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .product-anchorbar .container {
    gap: 10px;
  }

  .product-anchorbar a {
    padding: 12px 0;
    font-size: 13px;
  }

  .application-path-list article {
    grid-template-columns: 34px 1fr;
  }

  .application-path-list img {
    grid-column: 1 / -1;
  }

  .spec-table div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .installation-note-panel {
    grid-template-columns: 1fr;
  }

  .install-table {
    overflow-x: auto;
  }

  .install-table div {
    min-width: 420px;
  }

  .documents-layout-single {
    grid-template-columns: 1fr;
  }

  .document-action-panel {
    justify-content: stretch;
  }

  .document-action-panel .btn {
    width: 100%;
  }

  .document-panel {
    padding: 20px;
  }

  .detail-cta-layout {
    gap: 24px;
  }

  .footer-layout {
    display: grid;
  }
}