:root {
  --red: #d7192d;
  --red-dark: #b51022;
  --ink: #111827;
  --ink-2: #252d37;
  --muted: #5f6873;
  --soft: #f4f4f6;
  --surface: #ffffff;
  --line: #dfe3e6;
  --line-strong: #cbd1d5;
  --radius: 22px;
  --radius-small: 14px;
  --shell: 1460px;
  --header-height: 76px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid rgba(215, 25, 45, 0.48);
  outline-offset: 4px;
}

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

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #eef0f2;
}

::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: #aab1b8;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
  transition: transform 180ms ease;
}

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

.shell,
.content-frame {
  width: min(calc(100% - 64px), var(--shell));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  min-height: var(--header-height);
  border-bottom: 1px solid rgba(255, 255, 255, 0.72);
  background: rgba(244, 244, 246, 0.82);
  box-shadow: 0 8px 35px rgba(17, 24, 39, 0.04);
  backdrop-filter: blur(22px) saturate(150%);
  -webkit-backdrop-filter: blur(22px) saturate(150%);
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 32px rgba(17, 24, 39, 0.08);
}

.header-inner {
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: 220px minmax(520px, 1fr) auto;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  width: 218px;
}

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

.desktop-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 1.7vw, 31px);
  min-width: 0;
  font-size: 14px;
  color: #4a535e;
  white-space: nowrap;
}

.desktop-nav a,
.language-switch a {
  position: relative;
  transition: color 180ms ease;
}

.desktop-nav a::after {
  position: absolute;
  content: "";
  left: 0;
  right: 100%;
  bottom: -9px;
  height: 2px;
  background: var(--red);
  transition: right 180ms ease;
}

.desktop-nav a:hover,
.desktop-nav a:focus-visible,
.language-switch a:hover {
  color: var(--red);
}

.desktop-nav a:hover::after,
.desktop-nav a:focus-visible::after {
  right: 0;
}

.header-actions,
.language-switch {
  display: flex;
  align-items: center;
}

.header-actions {
  justify-content: flex-end;
  gap: 20px;
}

.language-switch {
  gap: 7px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

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

.language-switch span {
  color: #a7adb3;
}

.contact-button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 48px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.contact-button {
  min-height: 46px;
  border-color: #d0d5d9;
  background: rgba(255, 255, 255, 0.7);
}

.contact-button:hover,
.button-dark:hover {
  color: #fff;
  border-color: var(--red);
  background: var(--red);
  box-shadow: 0 13px 26px rgba(215, 25, 45, 0.2);
  transform: translateY(-2px);
}

.contact-button:active,
.button:active {
  transform: translateY(1px) scale(0.99);
}

.mobile-menu-button,
.mobile-navigation {
  display: none;
}

.hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  min-height: 100dvh;
  overflow: hidden;
  padding: calc(var(--header-height) + 26px) 0 44px;
  background:
    radial-gradient(circle at 80% 24%, rgba(215, 25, 45, 0.09), transparent 22%),
    linear-gradient(135deg, #f4f4f6 0%, #eceef0 53%, #f6f6f7 100%);
}

.hero::before {
  position: absolute;
  z-index: -1;
  content: "";
  inset: 0;
  background:
    linear-gradient(rgba(17, 24, 39, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 24, 39, 0.025) 1px, transparent 1px);
  background-size: 82px 82px;
  mask-image: radial-gradient(circle at 75% 40%, #000, transparent 70%);
}

.hero-particles,
.hero-particles canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-particles {
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.particle-glow {
  position: absolute;
  width: 280px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(215, 25, 45, 0.42), rgba(215, 25, 45, 0.1) 38%, transparent 70%);
  filter: blur(34px);
  transform: translate(-50%, -50%);
  will-change: transform;
}

.hero-shell {
  display: flex;
  align-items: center;
}

.hero-panel {
  position: relative;
  width: min(880px, 72%);
  overflow: hidden;
  padding: clamp(36px, 5vw, 68px);
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: calc(var(--radius) + 8px);
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 28px 80px rgba(34, 44, 55, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(24px) saturate(135%);
  -webkit-backdrop-filter: blur(24px) saturate(135%);
}

.hero-panel::before {
  position: absolute;
  content: "";
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(650px circle at var(--pointer-x, 40%) var(--pointer-y, 30%), rgba(255, 255, 255, 0.66), transparent 45%);
  transition: opacity 240ms ease;
}

.hero-panel:hover::before {
  opacity: 1;
}

.hero-panel > * {
  position: relative;
}

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  color: var(--red);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
}

.hero-kicker span {
  width: 36px;
  height: 2px;
  background: var(--red);
}

.hero h1 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.hero h1 strong,
.hero h1 span {
  display: block;
}

.hero h1 strong {
  font-size: clamp(46px, 5.5vw, 82px);
  font-weight: 900;
}

.hero h1 span {
  margin-top: 14px;
  color: #454e58;
  font-size: clamp(27px, 3vw, 48px);
  font-weight: 400;
  letter-spacing: -0.035em;
}

.hero-description {
  max-width: 66ch;
  margin: 28px 0 0;
  color: #515b65;
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 34px;
}

.button-primary {
  min-height: 54px;
  padding-inline: 30px;
  color: #fff;
  background: var(--red);
  box-shadow: 0 12px 28px rgba(215, 25, 45, 0.2);
}

.button-primary:hover {
  background: var(--red-dark);
  box-shadow: 0 17px 34px rgba(215, 25, 45, 0.28);
  transform: translateY(-2px);
}

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

.text-link,
.read-more {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 750;
}

.text-link span,
.read-more b {
  color: var(--red);
  transition: transform 180ms ease;
}

.text-link:hover span,
.read-more:hover b {
  transform: translateX(4px);
}

.content-frame {
  position: relative;
  z-index: 2;
  margin-top: 34px;
  background: rgba(255, 255, 255, 0.54);
  box-shadow: 0 0 60px rgba(38, 47, 56, 0.05);
}

.section {
  padding: clamp(84px, 9vw, 136px) clamp(24px, 5vw, 74px);
  border-bottom: 1px solid rgba(203, 209, 213, 0.7);
}

.section:last-child {
  border-bottom: 0;
}

.section-intro h2,
.section-heading h2,
.contact-intro h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.section-intro > p,
.section-heading > p {
  max-width: 68ch;
  margin: 24px 0 0;
  color: var(--muted);
}

.red-rule {
  display: block;
  width: 52px;
  height: 3px;
  margin-top: 22px;
  background: var(--red);
}

.company-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(520px, 1.18fr);
  gap: clamp(54px, 7vw, 110px);
  align-items: start;
}

.section-intro {
  position: sticky;
  top: calc(var(--header-height) + 42px);
}

.direct-answer {
  display: grid;
  gap: 8px;
  margin: 32px 0;
  padding: 22px 24px;
  border-left: 3px solid var(--red);
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
  background: #fff;
  box-shadow: 0 12px 32px rgba(40, 49, 58, 0.06);
}

.direct-answer strong {
  font-size: 15px;
}

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

.facts-list {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.facts-list div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 32px;
  padding: 19px 4px;
  border-bottom: 1px solid var(--line);
}

.facts-list dt {
  color: #7a838c;
  font-size: 13px;
  font-weight: 700;
}

.facts-list dd {
  margin: 0;
  color: #252d35;
  font-size: 14px;
}

.facts-list a {
  text-decoration: underline;
  text-decoration-color: rgba(215, 25, 45, 0.38);
  text-underline-offset: 4px;
}

.section-heading {
  margin-bottom: clamp(44px, 6vw, 76px);
}

.application-section {
  background: #f7f8f9;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}

.case {
  min-height: 280px;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 18px 46px rgba(38, 47, 56, 0.06);
}

.case-large {
  grid-column: span 7;
  color: #f7f8f9;
  border-color: #222b34;
  background:
    linear-gradient(135deg, rgba(215, 25, 45, 0.14), transparent 45%),
    #151b21;
}

.case-optical {
  grid-column: span 5;
  background:
    radial-gradient(circle at 90% 10%, rgba(215, 25, 45, 0.12), transparent 36%),
    #fff;
}

.case-acoustic {
  grid-column: 4 / span 8;
  min-height: auto;
  display: grid;
  grid-template-columns: minmax(230px, 0.7fr) 1.3fr;
  gap: 48px;
  align-items: center;
}

.case-product {
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.case h3 {
  margin: 12px 0 0;
  font-size: clamp(24px, 2.5vw, 38px);
  line-height: 1.2;
}

.case ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 28px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.case li {
  padding: 9px 0;
  border-bottom: 1px solid rgba(164, 173, 182, 0.25);
  font-size: 14px;
}

.case p {
  margin: 0;
  color: var(--muted);
}

.product-section {
  background: rgba(255, 255, 255, 0.54);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}

.product-card {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.product-card:hover {
  border-color: #bec5ca;
  box-shadow: 0 22px 56px rgba(38, 47, 56, 0.09);
  transform: translateY(-4px);
}

.product-featured {
  grid-row: span 2;
}

.product-media {
  min-height: 250px;
  overflow: hidden;
  background: #e2e5e7;
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.05);
  transition: transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-media img {
  transform: scale(1.035);
}

.product-body {
  padding: clamp(28px, 4vw, 44px);
}

.product-top,
.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: #879099;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.product-top span,
.article-meta span {
  color: var(--red);
}

.product-body h3 {
  margin: 22px 0 4px;
  font-size: clamp(36px, 4vw, 58px);
  line-height: 1;
  letter-spacing: -0.04em;
}

.product-body h3 a:hover {
  color: var(--red);
}

.product-body > strong {
  display: block;
  margin-top: 10px;
  font-size: 18px;
}

.product-body > p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.product-body ul {
  display: grid;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.product-body li {
  position: relative;
  padding-left: 18px;
  color: #343c45;
  font-size: 13px;
}

.product-body li::before {
  position: absolute;
  content: "";
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 1px;
  background: var(--red);
}

.product-body small {
  display: block;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: #818991;
  font-size: 11px;
  line-height: 1.65;
}

.product-optical {
  background: linear-gradient(145deg, #fff, #f4f7f8);
}

.product-hot {
  background: linear-gradient(145deg, #fff, #f7f7f7);
}

.roi-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  margin-top: 32px;
  padding: 30px 34px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #f4f6f7;
}

.roi-entry strong {
  font-size: 20px;
}

.roi-entry p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.technical-section {
  background: #f7f8f9;
}

.technical-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 36px;
  margin-bottom: clamp(44px, 6vw, 76px);
}

.technical-heading .section-heading {
  margin: 0;
}

.technical-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(520px, 1.08fr);
  gap: 28px;
  align-items: stretch;
}

.technical-feature {
  overflow: hidden;
  border-radius: var(--radius);
  background: #151b21;
  color: #f7f8f9;
}

.technical-feature > a {
  display: grid;
  height: 100%;
  grid-template-rows: minmax(280px, 0.9fr) auto;
}

.technical-image {
  overflow: hidden;
}

.technical-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.06);
  transition: transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.technical-feature:hover img {
  transform: scale(1.035);
}

.technical-body {
  padding: clamp(28px, 4vw, 44px);
}

.technical-body .article-meta {
  color: #9ca5ae;
}

.technical-body h3 {
  margin: 20px 0 0;
  font-size: clamp(26px, 3vw, 42px);
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.technical-body p {
  margin: 18px 0 0;
  color: #abb3bb;
  font-size: 14px;
}

.technical-body .read-more {
  margin-top: 28px;
  color: #fff;
}

.article-index {
  display: grid;
  align-content: stretch;
  border-top: 1px solid var(--line-strong);
}

.article-row {
  border-bottom: 1px solid var(--line-strong);
}

.article-row a {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 24px;
  align-items: center;
  height: 100%;
  min-height: 150px;
  padding: 22px 10px;
  transition: color 180ms ease, padding 180ms ease, background 180ms ease;
}

.article-row a:hover {
  padding-inline: 22px;
  color: var(--red);
  background: rgba(255, 255, 255, 0.7);
}

.article-number {
  color: #a5adb5;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.article-row h3 {
  margin: 11px 0 0;
  font-size: 18px;
  line-height: 1.5;
}

.article-row-summary a {
  min-height: 178px;
}

.article-row-summary p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--line-strong);
}

.faq-list summary {
  position: relative;
  display: grid;
  grid-template-columns: 54px 1fr 24px;
  gap: 22px;
  align-items: center;
  padding: 25px 10px;
  cursor: pointer;
  font-size: clamp(16px, 1.7vw, 21px);
  font-weight: 700;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  color: var(--red);
  font-size: 25px;
  font-weight: 400;
  text-align: center;
  transition: transform 180ms ease;
}

.faq-list details[open] summary::after {
  transform: rotate(45deg);
}

.faq-list summary span {
  color: #a2aab2;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.faq-list details p {
  max-width: 78ch;
  margin: -4px 0 0 86px;
  padding: 0 34px 30px 0;
  color: var(--muted);
  font-size: 14px;
}

.faq-more {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-top: 34px;
  padding: 28px 32px;
  border-radius: var(--radius);
  background: #eef1f2;
}

.faq-more strong {
  font-size: 18px;
}

.faq-more p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.evidence-section {
  background: #f7f8f9;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.evidence-grid article {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.evidence-grid article:nth-child(2),
.evidence-grid article:nth-child(3) {
  background: #f0f2f3;
}

.evidence-grid span {
  display: inline-block;
  color: var(--red);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.evidence-grid h3 {
  margin: 16px 0 0;
  font-size: 21px;
}

.evidence-grid p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.data-boundary {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 26px;
  margin-top: 24px;
  padding: 26px 30px;
  border-left: 3px solid var(--red);
  background: #fff;
}

.data-boundary p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: 34px;
  padding: clamp(80px, 9vw, 130px) 0 26px;
  color: #d6dade;
  background: #111820;
}

.contact-glow {
  position: absolute;
  top: -220px;
  right: -120px;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(215, 25, 45, 0.24), transparent 66%);
  pointer-events: none;
}

.contact-layout {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(410px, 0.9fr);
  gap: clamp(70px, 9vw, 150px);
  align-items: center;
}

.contact-intro > img {
  width: 210px;
  filter: grayscale(1) brightness(0) invert(1);
}

.contact-intro h2 {
  margin-top: 34px;
  color: #f4f6f7;
  font-size: clamp(38px, 5vw, 70px);
}

.contact-intro h2 span {
  display: block;
  color: #8e98a2;
  font-weight: 400;
}

.contact-intro p {
  max-width: 60ch;
  margin: 24px 0 0;
  color: #919aa3;
}

.contact-card {
  display: grid;
  gap: 0;
  padding: 38px;
  border: 1px solid #303943;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  font-style: normal;
}

.contact-card h3 {
  margin: 0 0 20px;
  color: #fff;
  font-size: 21px;
}

.contact-card > div,
.contact-card > a {
  display: grid;
  gap: 4px;
  padding: 18px 0;
  border-bottom: 1px solid #303943;
}

.contact-card > *:last-child {
  border-bottom: 0;
}

.contact-card small {
  color: #77828d;
  font-size: 11px;
}

.contact-card span {
  color: #d5d9dd;
  font-size: 14px;
}

.contact-card a:hover span {
  color: #fff;
}

.footer-legal {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 26px;
  align-items: center;
  margin-top: 86px;
  padding: 28px 0;
  border-top: 1px solid #27313a;
  border-bottom: 1px solid #27313a;
  color: #6f7a85;
  font-size: 11px;
}

.footer-media,
.footer-nav {
  display: flex;
  align-items: center;
  gap: 17px;
  white-space: nowrap;
}

.footer-media > span {
  cursor: not-allowed;
}

.footer-media > a,
.footer-media > button {
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
  font: inherit;
}

.footer-media > a:hover,
.footer-media > a:focus-visible,
.footer-media > button:hover,
.footer-media > button:focus-visible {
  color: #fff;
}

.footer-nav {
  justify-content: flex-end;
}

.footer-nav a:hover {
  color: #fff;
}

.compliance-records {
  display: grid;
  grid-template-columns: auto 20px auto;
  gap: 10px;
  align-items: center;
  justify-content: center;
  margin: 18px auto 0;
  color: #79838d;
  font-size: 11px;
}

.compliance-records a:hover {
  color: #fff;
}

.compliance-records img {
  width: 20px;
  height: 20px;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms cubic-bezier(0.16, 1, 0.3, 1), transform 560ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (max-width: 1180px) {
  .header-inner {
    position: relative;
    grid-template-columns: 1fr auto;
  }

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

  .mobile-menu-button {
    display: grid;
    gap: 5px;
    place-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid #ccd2d6;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.72);
    cursor: pointer;
  }

  .mobile-menu-button span {
    width: 18px;
    height: 1.5px;
    background: var(--ink);
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .mobile-menu-button[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
  }

  .mobile-menu-button[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-button[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
  }

  .mobile-navigation {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    display: grid;
    width: min(390px, calc(100vw - 48px));
    max-height: calc(100dvh - var(--header-height) - 30px);
    overflow-y: auto;
    padding: 20px;
    border: 1px solid rgba(205, 211, 215, 0.8);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.97);
    box-shadow: 0 24px 70px rgba(30, 39, 48, 0.16);
  }

  .mobile-navigation[hidden] {
    display: none;
  }

  .mobile-navigation > a {
    display: flex;
    justify-content: space-between;
    padding: 13px 10px;
    border-bottom: 1px solid #e4e7e9;
    font-weight: 650;
  }

  .mobile-navigation > a:last-child {
    border-bottom: 0;
  }

  .mobile-navigation > a span {
    color: var(--red);
  }

  .mobile-languages {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 10px;
  }

  .mobile-languages a {
    padding: 8px 10px;
    border-radius: 9px;
    background: #f1f3f4;
    text-align: center;
    font-size: 12px;
    font-weight: 700;
  }

  .mobile-languages a[aria-current="page"] {
    color: #fff;
    background: var(--red);
  }

  .hero-panel {
    width: min(920px, 86%);
  }

  .company-layout,
  .technical-layout {
    grid-template-columns: 1fr;
  }

  .section-intro {
    position: static;
  }

  .case-acoustic {
    grid-column: 2 / span 10;
  }

  .technical-layout {
    gap: 44px;
  }

  .footer-legal {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-media,
  .footer-nav {
    justify-content: center;
    flex-wrap: wrap;
  }
}

@media (max-width: 820px) {
  :root {
    --header-height: 68px;
  }

  .shell,
  .content-frame {
    width: min(calc(100% - 32px), var(--shell));
  }

  .brand {
    width: 174px;
  }

  .hero {
    min-height: 100dvh;
    padding: calc(var(--header-height) + 26px) 0 34px;
  }

  .hero-shell {
    align-items: center;
  }

  .hero-panel {
    width: 100%;
    padding: 34px 24px;
    border-radius: var(--radius);
  }

  .hero h1 strong {
    font-size: clamp(38px, 11vw, 58px);
  }

  .hero h1 span {
    font-size: clamp(22px, 6vw, 32px);
  }

  .hero-description {
    margin-top: 22px;
    font-size: 15px;
  }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
    margin-top: 28px;
  }

  .content-frame {
    margin-top: 16px;
  }

  .section {
    padding: 72px 20px;
  }

  .company-layout {
    gap: 52px;
  }

  .facts-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .application-grid,
  .product-grid,
  .evidence-grid,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .case-large,
  .case-optical,
  .case-acoustic {
    grid-column: auto;
  }

  .case-acoustic {
    grid-template-columns: 1fr;
    gap: 18px;
  }

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

  .product-featured {
    grid-row: auto;
  }

  .product-media {
    min-height: 220px;
  }

  .roi-entry,
  .technical-heading,
  .faq-more {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-row a {
    grid-template-columns: 34px 1fr auto;
    gap: 12px;
    min-height: 132px;
  }

  .article-row h3 {
    font-size: 16px;
  }

  .faq-list summary {
    grid-template-columns: 38px 1fr 20px;
    gap: 12px;
    padding-inline: 0;
  }

  .faq-list details p {
    margin-left: 50px;
    padding-right: 0;
  }

  .data-boundary {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .contact-layout {
    gap: 50px;
  }

  .contact-card {
    padding: 28px;
  }

  .footer-legal {
    margin-top: 62px;
  }

  .compliance-records {
    gap: 7px;
    font-size: 9px;
  }
}

@media (max-width: 470px) {
  .mobile-navigation {
    right: -2px;
  }

  .hero-kicker {
    letter-spacing: 0.12em;
  }

  .button {
    min-height: 48px;
    padding-inline: 20px;
  }

  .section {
    padding-inline: 16px;
  }

  .product-body,
  .case,
  .evidence-grid article,
  .faq-more,
  .roi-entry {
    padding: 24px;
  }

  .product-top {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .technical-feature > a {
    grid-template-rows: 230px auto;
  }

  .footer-media,
  .footer-nav {
    gap: 12px;
  }

  .compliance-records {
    grid-template-columns: auto 18px auto;
    gap: 5px;
    font-size: 8px;
  }

  .compliance-records img {
    width: 18px;
    height: 18px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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

@media print {
  .site-header,
  .hero-particles,
  .mobile-navigation,
  .footer-media {
    display: none !important;
  }

  body,
  .site-footer {
    color: #111;
    background: #fff;
  }

  .hero {
    min-height: auto;
    padding-top: 40px;
  }

  .hero-panel,
  .content-frame {
    width: 100%;
    box-shadow: none;
  }

  .section {
    break-inside: avoid;
  }
}


/* RELANET 2.6 static multi-page extensions */
.desktop-nav a.active,
.desktop-nav a[aria-current="page"] {
  color: var(--red);
}

.desktop-nav a.active::after,
.desktop-nav a[aria-current="page"]::after {
  right: 0;
}

.internal-hero {
  position: relative;
  min-height: 500px;
  overflow: hidden;
  color: #f7f8fa;
  background: #10151b var(--hero-image) center / cover no-repeat;
}

.internal-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(8, 13, 18, .91) 0%, rgba(8, 13, 18, .73) 48%, rgba(8, 13, 18, .36) 100%);
}

.internal-hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 500px;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: calc(var(--header-height) + 54px);
  padding-bottom: 70px;
}

.internal-hero h1 {
  max-width: 900px;
  margin: 24px 0 18px;
  font-size: clamp(40px, 5.2vw, 76px);
  line-height: 1.04;
  letter-spacing: -.045em;
}

.internal-hero-content > p {
  max-width: 760px;
  margin: 0;
  color: rgba(247, 248, 250, .8);
  font-size: clamp(17px, 1.35vw, 21px);
  line-height: 1.72;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  color: rgba(247, 248, 250, .74);
  font-size: 14px;
}

.breadcrumbs li:not(:last-child)::after {
  margin-left: 8px;
  color: rgba(247, 248, 250, .42);
  content: "/";
}

.breadcrumbs a:hover {
  color: #fff;
}

.section-heading {
  max-width: 840px;
  margin-bottom: 46px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(32px, 3.6vw, 54px);
  line-height: 1.08;
  letter-spacing: -.038em;
}

.section-heading p {
  max-width: 720px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.text-link {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-top: 24px;
  color: var(--red);
  font-weight: 750;
}

.text-link:hover span {
  transform: translateX(4px);
}

.text-link span {
  transition: transform 180ms ease;
}

.narrow-shell,
.article-shell {
  width: min(calc(100% - 64px), 1060px);
  margin-inline: auto;
}

.authority-grid,
.about-intro-grid,
.product-overview-grid,
.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  gap: clamp(46px, 7vw, 112px);
  align-items: start;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.fact-grid > div {
  min-height: 146px;
  padding: 26px;
  background: var(--surface);
}

.fact-grid dt {
  margin-bottom: 10px;
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
}

.fact-grid dd {
  margin: 0;
  color: var(--ink-2);
}

.fact-grid dd span {
  display: block;
  width: max-content;
  max-width: 100%;
  margin-top: 12px;
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
}

.fact-grid-wide {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.calligraphy-panel {
  display: grid;
  min-height: 520px;
  place-items: center;
  overflow: hidden;
  border-radius: var(--radius);
  background: transparent;
}

.calligraphy-panel img {
  width: min(82%, 430px);
  height: auto;
  object-fit: contain;
}

.vision-statement {
  margin: 34px 0 28px;
  padding: 26px 28px;
  border-left: 4px solid var(--red);
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
  background: var(--surface);
}

.vision-statement span {
  display: block;
  margin-bottom: 10px;
  color: var(--red);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: .08em;
}

.vision-statement p {
  max-width: 28ch;
  margin: 0;
  color: var(--ink);
  font-size: clamp(24px, 2.4vw, 38px);
  font-weight: 820;
  line-height: 1.35;
  letter-spacing: -.035em;
}

.organization-section {
  color: #f5f7f8;
  background: #151a1e;
}

.organization-section .section-heading h2 {
  color: #f5f7f8;
}

.organization-section .section-heading p {
  color: #aeb6bd;
}

.organization-chart {
  margin-top: 54px;
}

.org-lead {
  position: relative;
  width: min(100%, 510px);
  margin-inline: auto;
  padding: 26px 32px;
  border-radius: var(--radius-small);
  color: #fff;
  background: var(--red);
  box-shadow: 0 24px 56px rgba(104, 12, 22, .24);
}

.org-lead::after {
  position: absolute;
  top: 100%;
  left: 50%;
  width: 1px;
  height: 58px;
  background: #5b646c;
  content: "";
}

.org-lead span,
.org-index {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .08em;
}

.org-lead h3 {
  margin: 5px 0 2px;
  font-size: 25px;
}

.org-lead p {
  margin: 0;
  color: rgba(255, 255, 255, .78);
}

.org-branches {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-top: 58px;
  padding-top: 40px;
}

.org-branches::before {
  position: absolute;
  top: 0;
  right: calc(12.5% - 3px);
  left: calc(12.5% - 3px);
  height: 1px;
  background: #5b646c;
  content: "";
}

.org-department {
  position: relative;
  display: flex;
  min-height: 310px;
  flex-direction: column;
  padding: 30px;
  border: 1px solid #343b41;
  border-top: 3px solid var(--red);
  border-radius: var(--radius-small);
  background: #1d2327;
}

.org-department::before {
  position: absolute;
  bottom: 100%;
  left: 50%;
  width: 1px;
  height: 40px;
  background: #5b646c;
  content: "";
}

.org-index {
  color: #ff6474;
}

.org-department h3 {
  margin: 18px 0 14px;
  color: #f5f7f8;
  font-size: 21px;
  line-height: 1.35;
}

.org-department p {
  margin: 0;
  color: #aeb6bd;
  font-size: 15px;
  line-height: 1.75;
}

.org-department ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: auto 0 0;
  padding: 26px 0 0;
  list-style: none;
}

.org-department li {
  padding: 7px 10px;
  border: 1px solid #465059;
  border-radius: 7px;
  color: #d9dee2;
  font-size: 12px;
  font-weight: 700;
}

.large-copy {
  max-width: 680px;
  color: var(--ink-2);
  font-size: 20px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.timeline article {
  min-height: 270px;
  padding: 32px;
  background: var(--surface);
}

.timeline time {
  color: var(--red);
  font-size: 32px;
  font-weight: 850;
  letter-spacing: -.04em;
}

.timeline h3,
.capability-grid h3 {
  margin: 42px 0 12px;
  font-size: 22px;
}

.timeline p,
.capability-grid p {
  margin: 0;
  color: var(--muted);
}

.capability-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr .8fr 1.2fr;
  gap: 20px;
}

.capability-grid article {
  min-height: 260px;
  padding: 32px;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 18px 45px rgba(31, 40, 50, .06);
}

.capability-grid article:nth-child(1),
.capability-grid article:nth-child(4) {
  color: #f7f8fa;
  background: #18212a;
}

.capability-grid article:nth-child(1) p,
.capability-grid article:nth-child(4) p {
  color: rgba(247, 248, 250, .68);
}

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

.portfolio-product {
  position: relative;
  min-height: 520px;
  padding: 36px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 18px 50px rgba(31, 40, 50, .05);
}

.portfolio-product-media {
  margin: -36px -36px 28px;
  overflow: hidden;
  background: #e2e5e7;
}

.portfolio-product-media img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.portfolio-product:nth-child(4n + 1),
.portfolio-product:nth-child(4n + 4) {
  background: linear-gradient(145deg, #fff 0%, #eef1f4 100%);
}

.portfolio-product header {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  align-items: baseline;
}

.portfolio-product header span {
  color: var(--red);
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -.045em;
}

.portfolio-product header p {
  margin: 0;
  color: var(--muted);
  text-align: right;
}

.portfolio-product h2 {
  max-width: 650px;
  margin: 58px 0 24px;
  font-size: clamp(25px, 2.5vw, 39px);
  line-height: 1.2;
}

.portfolio-product ul {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.portfolio-product li {
  padding: 12px;
  border-radius: var(--radius-small);
  background: rgba(17, 24, 39, .055);
  font-size: 14px;
}

.portfolio-product dl {
  margin: 0 0 30px;
}

.portfolio-product dl > div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.portfolio-product dt {
  color: var(--muted);
  font-size: 13px;
}

.portfolio-product dd {
  margin: 0;
}

.product-overview-grid {
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr);
}

.data-boundary,
.boundary-note,
.roi-boundary {
  padding: 20px 22px;
  border-left: 3px solid var(--red);
  color: var(--muted);
  background: rgba(255, 255, 255, .62);
}

.highlight-panel {
  padding: 36px;
  border-radius: var(--radius);
  color: #f5f7f8;
  background: #18212a;
}

.highlight-panel h2 {
  margin: 0 0 28px;
  font-size: 28px;
}

.highlight-panel ul {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.highlight-panel li {
  position: relative;
  padding-left: 26px;
  color: rgba(245, 247, 248, .78);
}

.highlight-panel li::before {
  position: absolute;
  top: .78em;
  left: 0;
  width: 12px;
  height: 2px;
  background: var(--red);
  content: "";
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.spec-grid > div {
  min-height: 150px;
  padding: 26px;
  border-radius: var(--radius-small);
  background: var(--surface);
}

.spec-grid dt {
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.spec-grid dd {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  font-weight: 760;
  line-height: 1.45;
}

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

.material-application-grid article {
  min-height: 330px;
  padding: 36px;
  border-radius: var(--radius);
  background: var(--surface);
}

.material-application-grid article:last-child {
  color: #f7f8fa;
  background: #252d37;
}

.material-application-grid article:last-child .tag-cloud span {
  border-color: rgba(255, 255, 255, .18);
  color: rgba(255, 255, 255, .8);
  background: rgba(255, 255, 255, .06);
}

.material-application-grid h2,
.project-record-section h2 {
  margin: 0 0 30px;
  font-size: 34px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud span,
.faq-keywords span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, .74);
  font-size: 13px;
}

.project-record-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.project-record-list li {
  min-height: 130px;
  padding: 24px;
  border-radius: var(--radius-small);
  background: var(--surface);
}

.faq-explorer {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 50px;
  align-items: start;
}

.faq-tools {
  position: sticky;
  top: calc(var(--header-height) + 30px);
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
}

.faq-tools > label {
  display: block;
  margin-bottom: 12px;
  font-weight: 800;
}

.search-input-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-small);
  background: #fff;
}

.search-input-wrap input {
  min-width: 0;
  padding: 13px 14px;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
}

.search-input-wrap button {
  border: 0;
  border-left: 1px solid var(--line);
  color: var(--red);
  background: #fff;
  cursor: pointer;
}

.category-filters {
  display: grid;
  gap: 8px;
  margin-top: 20px;
}

.category-filters button {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink-2);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.category-filters button.active {
  border-color: var(--red);
  color: #fff;
  background: var(--red);
}

.faq-count {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* Homepage FAQ items contain only the question text and the disclosure icon.
   Override the legacy three-column FAQ template so English copy is not placed
   in the narrow number column. */
.home-page #faq .faq-list {
  min-width: 0;
}

.home-page #faq .faq-list summary {
  grid-template-columns: minmax(0, 1fr) 28px;
  gap: 20px;
  min-width: 0;
  padding: 27px 8px;
  font-size: clamp(18px, 1.45vw, 22px);
  line-height: 1.45;
  overflow-wrap: normal;
  word-break: normal;
}

.home-page #faq .faq-list summary::after {
  grid-column: 2;
}

.home-page #faq .faq-list details p {
  max-width: 76ch;
  margin: -3px 0 0;
  padding: 0 64px 29px 0;
  font-size: 15px;
  line-height: 1.82;
}

html[lang="en"] .home-page #faq .faq-list summary {
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-weight: 750;
  letter-spacing: -.012em;
  hyphens: none;
}

@media (max-width: 820px) {
  .home-page #faq .faq-list summary {
    grid-template-columns: minmax(0, 1fr) 24px;
    gap: 14px;
    padding: 22px 0;
    font-size: 18px;
  }

  .home-page #faq .faq-list details p {
    margin-top: -2px;
    padding: 0 38px 24px 0;
    font-size: 15px;
  }
}

@media (max-width: 520px) {
  .home-page #faq .faq-list summary {
    gap: 10px;
    padding: 20px 0;
    font-size: 17px;
    line-height: 1.5;
  }

  .home-page #faq .faq-list details p {
    padding: 0 32px 22px 0;
    font-size: 14px;
  }
}

.faq-list-wide {
  display: grid;
  min-width: 0;
  gap: 14px;
  border-top: 0;
}

.faq-list-wide details {
  overflow: clip;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.faq-list-wide details[open] {
  border-color: rgba(225, 22, 44, .34);
  box-shadow: 0 16px 42px rgba(32, 43, 52, .08);
}

.faq-list-wide summary {
  grid-template-columns: minmax(0, 1fr) 28px;
  gap: 20px;
  padding: 24px 26px;
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: clamp(18px, 1.45vw, 22px);
  font-weight: 760;
  line-height: 1.5;
  letter-spacing: -.015em;
  overflow-wrap: break-word;
  word-break: normal;
}

html[lang="en"] .faq-list-wide summary {
  font-family: Arial, "Helvetica Neue", sans-serif;
  letter-spacing: -.01em;
}

.faq-list-wide summary::after {
  grid-column: 2;
}

.faq-list-wide details p {
  max-width: 76ch;
  margin: 0;
  padding: 0 70px 24px 26px;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.85;
}

.faq-list-wide .faq-keywords {
  margin: 0;
  padding: 0 26px 24px;
}

.faq-list-wide .faq-keywords span {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: #f8f9fa;
  font-size: 12px;
}

.product-faq-layout {
  grid-template-columns: minmax(260px, .68fr) minmax(0, 1.5fr);
  gap: clamp(42px, 6vw, 92px);
}

.product-faq-intro {
  position: sticky;
  top: 112px;
}

.product-faq-intro .section-heading {
  margin-bottom: 22px;
}

.product-faq-intro .section-heading h2 {
  font-size: clamp(34px, 3.1vw, 42px);
  letter-spacing: -.04em;
  white-space: nowrap;
}

.product-faq-list {
  display: grid;
  min-width: 0;
  gap: 14px;
  border-top: 0;
}

.product-faq-list details {
  overflow: clip;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: var(--surface);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.product-faq-list details:hover {
  border-color: rgba(225, 22, 44, .24);
  transform: translateY(-1px);
}

.product-faq-list details[open] {
  border-color: rgba(225, 22, 44, .36);
  box-shadow: 0 18px 46px rgba(32, 43, 52, .08);
}

.product-faq-list summary {
  grid-template-columns: 46px minmax(0, 1fr) 28px;
  gap: 16px;
  padding: 23px 24px;
  color: var(--ink);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: clamp(17px, 1.35vw, 20px);
  font-weight: 760;
  line-height: 1.5;
  letter-spacing: -.012em;
  overflow-wrap: break-word;
  word-break: normal;
}

html[lang="en"] .product-faq-list summary {
  font-family: Arial, "Helvetica Neue", sans-serif;
  letter-spacing: -.008em;
}

.product-faq-list summary::after {
  grid-column: 3;
}

.product-faq-list summary .faq-number {
  grid-column: 1;
  color: var(--red);
  font-size: 13px;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.product-faq-list summary .faq-question {
  grid-column: 2;
  color: inherit;
  font: inherit;
}

.product-faq-list details p {
  max-width: 76ch;
  margin: 0;
  padding: 0 68px 26px 86px;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.85;
}

.product-production {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  margin: 20px 0;
  padding: 14px 16px;
  border-left: 3px solid var(--red);
  border-radius: 0 10px 10px 0;
  color: var(--ink-2);
  background: #f1f3f5;
  font-size: 14px;
  line-height: 1.55;
}

.product-production span {
  color: var(--red);
  font-weight: 850;
  white-space: nowrap;
}

.home-page .product-card-link {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  width: fit-content;
  margin-top: 24px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}

.home-page .product-card-link span {
  color: var(--red);
  transition: transform 180ms ease;
}

.home-page .product-card-link:hover {
  color: var(--red);
}

.home-page .product-card-link:hover span {
  transform: translateX(4px);
}

html[lang="en"] .home-page .product-body > strong {
  line-height: 1.45;
}

html[lang="en"] .home-page .product-body > p:not(.product-production) {
  line-height: 1.7;
}

.faq-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 18px;
}

.faq-empty {
  padding: 40px;
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
}

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

.news-card {
  min-height: 340px;
  padding: 34px;
  border-radius: var(--radius);
  background: var(--surface);
}

.news-card:nth-child(4n + 2),
.news-card:nth-child(4n + 3) {
  background: #e9edf0;
}

.news-meta,
.technical-meta,
.article-byline > div {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
  font-size: 13px;
}

.news-meta span,
.technical-meta span {
  color: var(--red);
  font-weight: 800;
}

.news-card h2 {
  margin: 54px 0 16px;
  font-size: clamp(24px, 2.2vw, 35px);
  line-height: 1.25;
}

.news-card p {
  color: var(--muted);
}

.technical-list {
  display: grid;
  gap: 32px;
}

.technical-card {
  display: grid;
  grid-template-columns: minmax(340px, .86fr) minmax(0, 1.14fr);
  gap: clamp(32px, 5vw, 74px);
  align-items: center;
  min-height: 430px;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
}

.technical-card:nth-child(even) {
  grid-template-columns: minmax(0, 1.14fr) minmax(340px, .86fr);
}

.technical-card:nth-child(even) .technical-image {
  order: 2;
}

.technical-image {
  display: block;
  overflow: hidden;
  border-radius: var(--radius-small);
  aspect-ratio: 16 / 10;
}

.technical-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 500ms cubic-bezier(.16, 1, .3, 1);
}

.technical-image:hover img {
  transform: scale(1.035);
}

.technical-card h2 {
  margin: 22px 0 16px;
  font-size: clamp(27px, 2.5vw, 41px);
  line-height: 1.2;
}

.technical-card p {
  color: var(--muted);
}

.article-byline {
  display: flex;
  gap: 30px;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 46px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.article-byline p {
  max-width: 480px;
  margin: 0;
  color: var(--muted);
  text-align: right;
}

.article-body {
  color: #27303a;
  font-size: 18px;
  line-height: 1.9;
}

.article-body h2 {
  margin: 74px 0 24px;
  color: var(--ink);
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.2;
}

.article-body p,
.article-body ul {
  max-width: 840px;
}

.article-body li + li {
  margin-top: 12px;
}

.article-body figure {
  margin: 48px 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: #e6e9eb;
}

.article-body figure img {
  width: 100%;
}

.article-caption {
  margin-top: -34px;
  color: var(--muted);
  font-size: 13px;
}

.article-table-wrap {
  margin: 40px 0;
  overflow-x: auto;
  border-radius: var(--radius-small);
  background: var(--surface);
}

.article-table-wrap table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

.article-table-wrap th,
.article-table-wrap td {
  padding: 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.article-boundary {
  margin-top: 70px;
  padding: 34px;
  border-left: 4px solid var(--red);
  background: var(--surface);
}

.article-boundary h2,
.related-products h2 {
  margin: 0 0 14px;
}

.related-products {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-top: 34px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.related-products h2 {
  width: 100%;
}

.related-products a {
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
}

.roi-intro {
  display: flex;
  gap: 32px;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 34px;
}

.roi-intro .section-heading {
  margin-bottom: 0;
}

.roi-intro > p {
  max-width: 320px;
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--radius-small);
  color: var(--muted);
  background: var(--surface);
  font-size: 14px;
}

.roi-form {
  display: grid;
  gap: 22px;
}

.roi-stepper {
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.roi-stepper ol {
  display: grid;
  grid-template-columns: repeat(5, minmax(180px, 1fr));
  min-width: 900px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  list-style: none;
}

.roi-stepper li {
  min-width: 0;
}

.roi-stepper button {
  display: grid;
  width: 100%;
  min-height: 118px;
  padding: 18px 20px;
  border: 0;
  border-top: 3px solid transparent;
  color: var(--muted);
  background: var(--surface);
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.roi-stepper button:hover,
.roi-stepper button:focus-visible {
  color: var(--ink);
  background: #f5f6f7;
}

.roi-stepper button.active {
  border-top-color: var(--red);
  color: var(--ink);
  background: #fff;
}

.roi-stepper button > span {
  color: var(--red);
  font-size: 12px;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.roi-stepper button strong {
  margin-top: 9px;
  font-size: 16px;
}

.roi-stepper button small {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.roi-five-step.roi-enhanced .roi-step-panel[hidden] {
  display: none;
}

.roi-step-panel {
  min-height: 490px;
  padding: clamp(28px, 4vw, 48px);
  border-radius: var(--radius);
  background: var(--surface);
}

.roi-step-header {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  margin-bottom: 34px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.roi-step-index {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--red);
  font-size: 14px;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.roi-step-header h2 {
  margin: 0;
  font-size: clamp(24px, 2.4vw, 34px);
  line-height: 1.2;
}

.roi-step-header p {
  max-width: 76ch;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

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

.roi-field-grid-compact {
  max-width: 900px;
}

.roi-compare-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.roi-compare-grid fieldset {
  min-width: 0;
  margin: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-small);
  background: #f7f8f9;
}

.roi-compare-grid legend {
  padding: 0 10px;
  color: var(--red);
  font-size: 14px;
  font-weight: 850;
}

.roi-compare-grid .roi-field-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.roi-field {
  display: grid;
  gap: 8px;
}

.roi-field > span {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 700;
}

.roi-field > div {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: #fff;
}

.roi-field input {
  min-width: 0;
  padding: 12px;
  border: 0;
  color: var(--ink);
  font: inherit;
  font-variant-numeric: tabular-nums;
}

.roi-field input:focus-visible {
  outline: 3px solid rgba(225, 22, 44, .16);
  outline-offset: -2px;
}

.roi-field small {
  padding: 0 12px;
  color: var(--muted);
  white-space: nowrap;
}

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

.roi-step-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.roi-step-actions-end {
  justify-content: flex-end;
}

.roi-final-actions {
  justify-content: flex-start;
}

.roi-final-actions [data-roi-prev] {
  margin-right: auto;
}

.roi-review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.roi-review-grid article {
  padding: 22px;
  border-left: 3px solid var(--red);
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
  background: #f4f6f7;
}

.roi-review-grid strong {
  color: var(--ink);
  font-size: 16px;
}

.roi-review-grid p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.roi-actions button {
  cursor: pointer;
}

.roi-error {
  padding: 14px 18px;
  border: 1px solid rgba(215, 25, 45, .28);
  border-radius: var(--radius-small);
  color: var(--red-dark);
  background: rgba(215, 25, 45, .07);
}

.roi-results {
  margin-top: 50px;
  padding: 38px;
  border-radius: var(--radius);
  color: #f7f8fa;
  background: #18212a;
}

.roi-results header > p {
  margin: 0;
  color: #ef6a78;
  font-weight: 800;
}

.roi-results header h2 {
  margin: 10px 0 30px;
  font-size: clamp(28px, 3vw, 44px);
}

.roi-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.roi-metrics article {
  min-height: 150px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius-small);
  background: rgba(255, 255, 255, .055);
}

.roi-metrics span {
  display: block;
  min-height: 45px;
  color: rgba(247, 248, 250, .64);
  font-size: 13px;
}

.roi-metrics strong {
  display: block;
  margin-top: 14px;
  color: #fff;
  font-size: 24px;
  font-variant-numeric: tabular-nums;
}

.roi-boundary {
  margin: 28px 0 0;
  color: rgba(247, 248, 250, .68);
  background: rgba(255, 255, 255, .04);
}

.not-found-main {
  display: grid;
  min-height: 100dvh;
  place-items: center;
  padding: calc(var(--header-height) + 60px) 30px 60px;
}

.not-found-main section {
  max-width: 720px;
  text-align: center;
}

.not-found-main section > p {
  margin: 0;
  color: var(--red);
  font-size: clamp(90px, 15vw, 190px);
  font-weight: 900;
  line-height: .8;
}

.not-found-main h1 {
  margin: 36px 0 12px;
  font-size: clamp(36px, 5vw, 62px);
}

.not-found-main section > span {
  color: var(--muted);
}

.not-found-main section > div {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 28px;
}

.site-footer {
  color: rgba(247, 248, 250, .72);
  background: #101722;
}

.footer-shell {
  width: min(calc(100% - 64px), var(--shell));
  margin-inline: auto;
  padding: 82px 0 26px;
}

.footer-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 60px;
  align-items: end;
  padding-bottom: 58px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

.footer-kicker {
  margin: 0 0 12px;
  color: #ef6a78;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: .12em;
}

.footer-contact h2 {
  max-width: 760px;
  margin: 0;
  color: #f7f8fa;
  font-size: clamp(32px, 4vw, 58px);
  line-height: 1.08;
}

.footer-contact p:last-child {
  max-width: 700px;
}

.footer-contact-links {
  display: grid;
  gap: 8px;
  text-align: right;
}

.footer-contact-links a {
  color: #fff;
  font-size: 18px;
  font-weight: 720;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 50px;
  align-items: end;
  padding: 48px 0 34px;
}

.footer-brand img {
  width: 230px;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  margin: 14px 0 0;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  justify-content: flex-end;
}

.footer-nav a:hover {
  color: #fff;
}

.social-slots {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 24px 0 34px;
  border-top: 1px solid rgba(255, 255, 255, .08);
}

.social-slots > span,
.social-slots > a,
.social-slots > button {
  padding: 8px 12px;
  border: 1px dashed rgba(255, 255, 255, .22);
  border-radius: 999px;
  color: rgba(247, 248, 250, .58);
  background: transparent;
  font-family: inherit;
  font-size: 13px;
  line-height: inherit;
}

.social-slots > a:hover,
.social-slots > a:focus-visible,
.social-slots > button:hover,
.social-slots > button:focus-visible {
  border-style: solid;
  border-color: rgba(255, 255, 255, .56);
  color: #fff;
}

.social-qr-trigger {
  position: relative;
  cursor: pointer !important;
}

.social-qr-popover {
  position: absolute;
  z-index: 20;
  bottom: calc(100% + 14px);
  left: 50%;
  display: grid;
  width: min(244px, 76vw);
  gap: 8px;
  padding: 10px;
  border: 1px solid rgba(20, 28, 35, .16);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(0, 0, 0, .3);
  color: #1c2329;
  font-size: 12px;
  line-height: 1.45;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  white-space: normal;
  transform: translate(-50%, 8px);
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}

.social-qr-popover img {
  display: block;
  width: 100%;
  max-height: 270px;
  border-radius: 9px;
  object-fit: contain;
}

.social-qr-popover small {
  display: block;
  color: #4d5963;
  text-align: center;
}

.social-qr-trigger:hover .social-qr-popover,
.social-qr-trigger:focus-visible .social-qr-popover,
.social-qr-trigger.is-open .social-qr-popover {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.footer-bottom {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 30px;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 13px;
}

.footer-bottom > p {
  margin: 0;
}

.compliance-records {
  display: flex;
  gap: 13px;
  justify-content: center;
  align-items: center;
}

.compliance-records img {
  width: 20px;
  height: 20px;
}

@media (max-width: 1180px) {
  .fact-grid-wide,
  .timeline,
  .capability-grid,
  .roi-field-grid,
  .roi-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .faq-explorer {
    grid-template-columns: 290px minmax(0, 1fr);
    gap: 30px;
  }

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

  .org-branches::before,
  .org-department::before,
  .org-lead::after {
    display: none;
  }

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

  .footer-contact-links {
    text-align: left;
  }
}

@media (max-width: 820px) {
  .internal-hero,
  .internal-hero-content {
    min-height: 440px;
  }

  .internal-hero-content {
    padding-bottom: 46px;
  }

  .internal-hero h1 {
    font-size: clamp(36px, 10vw, 52px);
  }

  .authority-grid,
  .about-intro-grid,
  .product-overview-grid,
  .faq-layout,
  .faq-explorer,
  .material-application-grid,
  .technical-card,
  .technical-card:nth-child(even),
  .footer-contact,
  .footer-main,
  .footer-bottom {
    grid-template-columns: 1fr;
  }

  .technical-card:nth-child(even) .technical-image {
    order: initial;
  }

  .calligraphy-panel {
    min-height: 360px;
  }

  .calligraphy-panel img {
    width: min(78%, 360px);
  }

  .vision-statement p {
    max-width: none;
  }

  .organization-chart {
    margin-top: 38px;
  }

  .org-branches {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 18px;
    padding-top: 0;
  }

  .org-department {
    min-height: 0;
  }

  .fact-grid,
  .fact-grid-wide,
  .timeline,
  .capability-grid,
  .product-grid,
  .portfolio-grid,
  .spec-grid,
  .project-record-list,
  .news-grid,
  .roi-field-grid,
  .roi-metrics {
    grid-template-columns: 1fr;
  }

  .faq-tools {
    position: static;
  }

  .product-faq-intro {
    position: static;
  }

  .product-faq-intro .section-heading h2 {
    white-space: normal;
  }

  .product-faq-list summary {
    grid-template-columns: 40px minmax(0, 1fr) 24px;
    gap: 12px;
    padding: 21px 20px;
    font-size: 18px;
    line-height: 1.55;
  }

  .product-faq-list details p {
    padding: 0 20px 22px 72px;
    font-size: 15px;
  }

  .faq-list-wide summary {
    gap: 14px;
    padding: 21px 20px;
    font-size: 18px;
    line-height: 1.55;
  }

  .faq-list-wide details p {
    padding: 0 20px 21px;
    font-size: 15px;
    line-height: 1.8;
  }

  .faq-list-wide .faq-keywords {
    padding: 0 20px 21px;
  }

  .portfolio-product {
    min-height: auto;
  }

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

  .article-byline,
  .roi-intro {
    display: block;
  }

  .roi-stepper ol {
    grid-template-columns: repeat(5, minmax(142px, 1fr));
    min-width: 710px;
  }

  .roi-stepper button {
    min-height: 88px;
    padding: 15px 16px;
  }

  .roi-stepper button small {
    display: none;
  }

  .roi-step-panel {
    min-height: 0;
  }

  .roi-compare-grid,
  .roi-review-grid {
    grid-template-columns: 1fr;
  }

  .article-byline p {
    margin-top: 18px;
    text-align: left;
  }

  .roi-intro > p {
    margin-top: 20px;
  }

  .footer-main,
  .footer-bottom {
    align-items: start;
  }

  .footer-nav,
  .compliance-records {
    justify-content: flex-start;
  }
}

@media (max-width: 520px) {
  .internal-hero-content,
  .footer-shell,
  .narrow-shell,
  .article-shell {
    width: min(calc(100% - 32px), var(--shell));
  }

  .internal-hero h1 {
    margin-top: 18px;
  }

  .section-heading {
    margin-bottom: 32px;
  }

  .portfolio-product,
  .technical-card,
  .news-card,
  .roi-form > section,
  .roi-results,
  .highlight-panel,
  .material-application-grid article {
    padding: 22px;
  }

  .portfolio-product-media {
    margin: -22px -22px 22px;
  }

  .portfolio-product header {
    display: block;
  }

  .portfolio-product header p {
    text-align: left;
  }

  .portfolio-product h2 {
    margin-top: 34px;
  }

  .product-production {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .org-lead,
  .org-department,
  .vision-statement {
    padding: 22px;
  }

  .product-faq-list summary {
    grid-template-columns: 34px minmax(0, 1fr) 22px;
    padding: 19px 16px;
    font-size: 16px;
  }

  .product-faq-list details p {
    padding: 0 16px 20px 62px;
    font-size: 14px;
  }

  .roi-stepper ol {
    grid-template-columns: repeat(5, minmax(126px, 1fr));
    min-width: 630px;
  }

  .roi-stepper button strong {
    font-size: 14px;
  }

  .roi-step-header {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
    margin-bottom: 26px;
    padding-bottom: 20px;
  }

  .roi-step-index {
    width: 42px;
    height: 42px;
  }

  .roi-compare-grid fieldset,
  .roi-review-grid article {
    padding: 18px;
  }

  .roi-step-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .roi-final-actions [data-roi-prev] {
    margin-right: 0;
  }

  .spec-grid dd {
    font-size: 17px;
  }

  .not-found-main section > div,
  .roi-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .compliance-records {
    flex-wrap: wrap;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .technical-image img,
  .text-link span {
    transition: none;
  }
}

@media print {
  .site-header,
  .site-footer,
  .internal-hero,
  .roi-intro,
  .roi-form,
  .roi-actions {
    display: none !important;
  }

  .roi-results {
    display: block !important;
    margin: 0;
    color: #111827;
    background: #fff;
  }

  .roi-results article {
    border-color: #dfe3e6;
    background: #fff;
  }

  .roi-results span,
  .roi-results strong,
  .roi-boundary {
    color: #111827;
  }
}

/* Full adhesive-film ROI model, based on the approved standalone HTML model. */
.roi-full-model {
  background: #f4f4f6;
}

.roi-model-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  min-height: 520px;
  align-items: center;
  overflow: hidden;
  padding: calc(var(--header-height) + 60px) 0 72px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 82% 18%, rgba(216, 22, 33, 0.08), transparent 38%),
    radial-gradient(circle at 12% 82%, rgba(20, 122, 114, 0.09), transparent 42%),
    linear-gradient(135deg, #f8f9fa, #eff1f3);
}

.roi-model-hero::after {
  position: absolute;
  z-index: -1;
  top: 15%;
  right: 7%;
  width: 340px;
  height: 340px;
  border: 1px solid rgba(216, 22, 33, 0.1);
  border-radius: 50%;
  content: "";
}

.roi-model-hero-inner {
  position: relative;
  max-width: 1240px;
}

.roi-model-hero .breadcrumbs {
  margin-bottom: 30px;
  color: var(--muted);
}

.roi-model-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--red);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.roi-model-kicker span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 14px rgba(216, 22, 33, 0.5);
}

.roi-model-hero h1 {
  max-width: 820px;
  margin: 0;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.roi-model-hero h1 strong,
.roi-model-hero h1 span {
  display: block;
}

.roi-model-hero h1 strong {
  color: var(--ink);
  font-size: clamp(42px, 5vw, 66px);
  font-weight: 900;
}

.roi-model-hero h1 span {
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: clamp(28px, 3.2vw, 43px);
  font-weight: 350;
}

.roi-model-hero-inner > p:not(.roi-model-kicker) {
  max-width: 720px;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  font-weight: 350;
  line-height: 1.8;
}

.roi-model-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 34px;
}

.roi-model-tool {
  padding: 72px 0 104px;
}

.roi-model-heading {
  margin-bottom: 34px;
}

.roi-model-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 3vw, 40px);
  letter-spacing: -0.035em;
  line-height: 1.18;
}

.roi-model-heading p {
  max-width: 820px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.roi-model-heading > span {
  display: block;
  width: 50px;
  height: 4px;
  margin-top: 20px;
  background: var(--red);
}

.roi-model-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 0 30px;
  overflow-x: auto;
  padding: 6px 2px 12px;
  scrollbar-width: thin;
}

.roi-model-stepper ol {
  display: flex;
  min-width: max-content;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.roi-model-stepper li {
  display: flex;
  align-items: center;
}

.roi-model-stepper li:not(:last-child)::after {
  width: clamp(16px, 2.5vw, 36px);
  height: 2px;
  margin: 0 5px;
  background: #d1d5db;
  content: "";
}

.roi-model-stepper li.done:not(:last-child)::after {
  background: var(--teal);
}

.roi-model-stepper button {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  min-width: 148px;
  padding: 8px;
  border-radius: 10px;
  color: #8b949d;
  text-align: left;
  background: transparent;
  cursor: pointer;
}

.roi-model-stepper button > span {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 2px solid #d1d5db;
  border-radius: 50%;
  background: #fff;
  font-size: 13px;
  font-weight: 700;
}

.roi-model-stepper button strong {
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.roi-model-stepper li.active button {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
}

.roi-model-stepper li.active button > span {
  border-color: var(--red);
  color: #fff;
  background: var(--red);
  box-shadow: 0 5px 14px rgba(216, 22, 33, 0.22);
}

.roi-model-stepper li.done button > span {
  border-color: var(--teal);
  color: #fff;
  background: var(--teal);
}

.roi-model-error {
  margin: 0 0 18px;
  padding: 12px 16px;
  border-left: 3px solid var(--red);
  border-radius: 6px;
  color: #a80e17;
  background: #fff0f1;
}

.roi-model-card {
  margin-bottom: 20px;
  padding: 32px;
  border: 1px solid #e2e5e7;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 2px 5px rgba(17, 24, 39, 0.03), 0 18px 42px rgba(17, 24, 39, 0.05);
}

.roi-model-card > header > h2 {
  margin: 0 0 6px;
  color: var(--ink);
  font-size: 19px;
  line-height: 1.45;
}

.roi-model-card > header > p {
  margin: 0 0 24px;
  color: #8a949b;
  font-size: 13px;
  line-height: 1.8;
}

.roi-model-card > header .roi-model-spray-title {
  color: var(--blue);
}

.roi-model-card > header .roi-model-film-title {
  color: var(--teal);
}

.roi-model-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 19px 24px;
}

.roi-model-field {
  min-width: 0;
}

.roi-model-field label {
  display: block;
  margin-bottom: 7px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 650;
}

.roi-model-field label span {
  color: #9099a1;
  font-size: 11.5px;
  font-weight: 400;
}

.roi-model-field > div {
  display: flex;
  align-items: center;
}

.roi-model-field input {
  width: 100%;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid #cfd4d7;
  border-radius: 7px;
  color: var(--ink);
  background: #fff;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.roi-model-field input:focus {
  border-color: var(--red);
  outline: 0;
  box-shadow: 0 0 0 3px rgba(216, 22, 33, 0.08);
}

.roi-model-field small {
  min-width: 54px;
  margin-left: 9px;
  color: var(--muted);
  font-size: 12px;
}

.roi-model-card hr {
  margin: 24px 0 22px;
  border: 0;
  border-top: 1px solid #e4e7e9;
}

.roi-model-part-control {
  max-width: 620px;
}

.roi-model-parts {
  margin-top: 14px;
}

.roi-model-part-item {
  display: grid;
  grid-template-columns: 90px 140px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed #dde1e3;
}

.roi-model-part-item strong {
  font-size: 13px;
}

.roi-model-part-item input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #cfd4d7;
  border-radius: 7px;
}

.roi-model-part-item span {
  color: #8a949b;
  font-size: 12px;
}

.roi-model-area-summary {
  margin: 12px 0 0;
  padding: 12px 15px;
  border-left: 3px solid var(--blue);
  border-radius: 7px;
  color: var(--blue);
  background: #eaf1f6;
  font-size: 13px;
  font-weight: 650;
  line-height: 1.75;
}

.roi-model-group {
  display: inline-block;
  margin: 22px 0 16px;
  padding: 7px 14px;
  border-radius: 7px;
  color: var(--red);
  background: #fdecee;
  font-size: 13px;
}

.roi-model-group-spray {
  color: var(--blue);
  background: #eaf1f6;
}

.roi-model-group-film {
  color: var(--teal);
  background: #e1f2f0;
}

.roi-model-group-amber {
  color: #a65308;
  background: #fdf1e3;
}

.roi-model-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}

.roi-model-actions-end {
  justify-content: flex-end;
}

.roi-model-note {
  margin-top: 22px;
  padding: 15px 17px;
  border-left: 3px solid var(--red);
  border-radius: 7px;
  color: var(--muted);
  background: #f5f6f7;
  font-size: 13px;
  line-height: 1.85;
}

.roi-model-results > * {
  animation: roi-model-reveal 0.32s ease both;
}

@keyframes roi-model-reveal {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.roi-model-summary {
  margin-bottom: 28px;
  padding: 26px 28px;
  border: 1px solid #dde2e4;
  border-left: 4px solid var(--red);
  border-radius: 14px;
  background: linear-gradient(135deg, #fdecee, #e1f2f0);
}

.roi-model-summary h2 {
  margin: 0 0 14px;
  font-size: 22px;
}

.roi-model-summary p {
  margin: 5px 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.roi-model-summary strong {
  color: var(--ink);
}

.roi-model-conclusion {
  margin-top: 16px;
  padding: 13px 16px;
  border-radius: 8px;
  color: var(--red);
  background: rgba(255, 255, 255, 0.76);
  font-size: 15px;
  font-weight: 750;
}

.roi-model-result-section {
  margin-bottom: 32px;
  padding: 28px;
  border: 1px solid #e2e5e7;
  border-radius: 14px;
  background: #fff;
}

.roi-model-result-section h2 {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 17px;
  padding-bottom: 11px;
  border-bottom: 2px solid #e5e7e9;
  font-size: 18px;
}

.roi-model-result-section h2::before {
  width: 4px;
  height: 20px;
  border-radius: 3px;
  background: var(--red);
  content: "";
}

.roi-model-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.roi-model-metric {
  padding: 19px 14px;
  border: 1px solid #e2e5e7;
  border-radius: 12px;
  text-align: center;
}

.roi-model-metric span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 12px;
}

.roi-model-metric strong {
  display: block;
  color: var(--ink);
  font-size: clamp(19px, 2vw, 27px);
  line-height: 1.25;
}

.roi-model-metric small {
  color: #8a949b;
  font-size: 11px;
  font-weight: 400;
}

.roi-model-metric-good { background: #e1f2f0; border-color: rgba(20, 122, 114, 0.2); }
.roi-model-metric-good strong { color: var(--teal); }
.roi-model-metric-warn { background: #eaf1f6; border-color: rgba(50, 108, 145, 0.2); }
.roi-model-metric-warn strong { color: var(--blue); }
.roi-model-metric-highlight { background: linear-gradient(135deg, #fdecee, #fff); border-color: rgba(216, 22, 33, 0.22); }
.roi-model-metric-highlight strong { color: var(--red); }

.roi-model-table-wrap {
  overflow-x: auto;
}

.roi-model-results table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 13px;
}

.roi-model-results th,
.roi-model-results td {
  padding: 10px 12px;
  border-bottom: 1px solid #e5e7e9;
  text-align: right;
}

.roi-model-results th:first-child,
.roi-model-results td:first-child {
  text-align: left;
}

.roi-model-results thead th {
  color: var(--muted);
  background: #f4f5f6;
  font-size: 12px;
}

.roi-model-results tfoot td {
  border-top: 2px solid #cfd4d7;
  background: #fafbfb;
  font-weight: 750;
}

.roi-model-spray-value { color: var(--blue); font-weight: 600; }
.roi-model-film-value { color: var(--teal); font-weight: 600; }

.roi-model-bars {
  display: grid;
  gap: 12px;
}

.roi-model-bar-row {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.roi-model-bar-row > span {
  color: var(--muted);
  font-size: 12px;
  text-align: right;
}

.roi-model-bar-track {
  height: 28px;
  overflow: hidden;
  border-radius: 7px;
  background: #f0f2f3;
}

.roi-model-bar-fill {
  display: flex;
  height: 100%;
  align-items: center;
  justify-content: flex-end;
  min-width: 72px;
  padding-right: 10px;
  border-radius: 7px;
  color: #fff;
  font-size: 12px;
  font-weight: 750;
}

.roi-model-bar-spray { background: linear-gradient(90deg, var(--blue), #4a86b0); }
.roi-model-bar-film { background: linear-gradient(90deg, var(--teal), #1d9a8e); }

.roi-model-chart svg {
  width: 100%;
  height: auto;
}

.roi-model-result-note {
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.8;
}

.roi-model-method {
  margin-top: 44px;
}

.roi-model-method .roi-model-heading {
  margin-bottom: 22px;
}

.roi-model-method p {
  margin: 8px 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
}

.roi-model-method strong {
  color: var(--ink);
}

.roi-model-boundary {
  margin-top: 18px !important;
  padding: 14px 16px;
  border-left: 3px solid var(--red);
  border-radius: 7px;
  background: #f5f6f7;
}

@media (max-width: 900px) {
  .roi-model-hero {
    min-height: auto;
    padding: calc(var(--header-height) + 42px) 0 58px;
  }

  .roi-model-hero::after {
    display: none;
  }

  .roi-model-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .roi-model-tool {
    padding: 52px 0 76px;
  }

  .roi-model-card,
  .roi-model-result-section,
  .roi-model-summary {
    padding: 22px 18px;
  }

  .roi-model-grid,
  .roi-model-metrics {
    grid-template-columns: 1fr;
  }

  .roi-model-stepper {
    justify-content: flex-start;
  }

  .roi-model-stepper button {
    min-width: 110px;
    grid-template-columns: 32px minmax(0, 1fr);
  }

  .roi-model-stepper button strong {
    max-width: 70px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .roi-model-part-item {
    grid-template-columns: 70px minmax(100px, 1fr);
  }

  .roi-model-part-item span {
    grid-column: 1 / -1;
  }

  .roi-model-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .roi-model-actions .button {
    width: 100%;
  }

  .roi-model-bar-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .roi-model-bar-row > span {
    text-align: left;
  }
}

@media print {
  .roi-full-model .site-header,
  .roi-full-model .site-footer,
  .roi-model-hero,
  .roi-model-heading,
  .roi-model-stepper,
  .roi-model-panel:not([data-roi-full-panel="5"]),
  .roi-model-actions,
  .roi-model-method {
    display: none !important;
  }

  .roi-model-tool {
    padding: 0;
  }

  .roi-model-panel[data-roi-full-panel="5"] {
    display: block !important;
  }
}

/* R-9610 嵌入产品矩阵第 7 卡：紫色渐变背景 */
.product-pur {
  background: linear-gradient(145deg, #fff, #f6f5fa);
}

/* R-9610 卡片缩小尺寸：占两行填补矩阵空白位置，内容字号/内边距下调 */
.product-compact {
  grid-row: span 2;
}

.product-compact .product-media {
  min-height: 200px;
}

.product-compact .product-body {
  padding: clamp(22px, 2.6vw, 30px);
}

.product-compact .product-body h3 {
  margin-top: 14px;
  font-size: clamp(30px, 3vw, 44px);
}

.product-compact .product-body > strong {
  margin-top: 8px;
  font-size: 15px;
}

.product-compact .product-body > p {
  margin-top: 12px;
  font-size: 12.5px;
}

.product-compact .product-body ul {
  gap: 6px;
  margin-top: 14px;
}

.product-compact .product-body li {
  font-size: 12px;
}

.product-compact .product-body small {
  margin-top: 16px;
  padding-top: 12px;
  font-size: 10.5px;
}