:root {
  --ink: #171b1f;
  --muted: #5e6870;
  --line: #e3e7ea;
  --paper: #ffffff;
  --soft: #f4f6f7;
  --red: #9f3d35;
  --red-dark: #7d302b;
  --steel: #2a3137;
  --shadow: 0 18px 42px rgba(20, 26, 32, 0.1);
  --max: 1760px;
  --product-max: 1920px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.62;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 clamp(20px, 5vw, 56px);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.38);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(14px);
  transition: background 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  background: rgba(255, 255, 255, 0.94);
  border-color: rgba(23, 27, 31, 0.08);
  box-shadow: 0 10px 28px rgba(20, 26, 32, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  height: 64px;
  font-weight: 900;
}

.brand-logo {
  width: auto;
  height: 54px;
  max-width: 108px;
  object-fit: contain;
  opacity: 0.9;
}

.brand-text {
  color: var(--ink);
  font-size: 19px;
  letter-spacing: 0;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  color: inherit;
  font-size: 15px;
  font-weight: 800;
}

.site-nav a {
  opacity: 0.92;
  transition: color 160ms ease, opacity 160ms ease;
}

.site-nav a:hover {
  color: var(--red);
  opacity: 1;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(23, 27, 31, 0.52);
  border-radius: 8px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.32);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.concept-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--soft);
}

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

.hero-image {
  object-fit: cover;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(246, 247, 248, 0.94) 0%, rgba(246, 247, 248, 0.72) 42%, rgba(246, 247, 248, 0.2) 74%),
    linear-gradient(0deg, rgba(246, 247, 248, 0.94) 0%, rgba(246, 247, 248, 0.1) 42%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(980px, calc(100% - 40px));
  margin-left: clamp(20px, 8vw, 112px);
  padding-top: 72px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--red);
  font-size: 14px;
  font-weight: 900;
}

.section .eyebrow {
  margin-bottom: 18px;
  font-size: clamp(24px, 2.7vw, 30px);
  line-height: 1.1;
}

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

h1,
h2,
h3 {
  text-wrap: balance;
}

h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(44px, 5.1vw, 68px);
  line-height: 1.03;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4.2vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 22px;
  line-height: 1.28;
}

.hero-lead {
  max-width: 640px;
  margin: 20px 0 0;
  color: var(--steel);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  min-height: 44px;
  padding: 0 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 900;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: rgba(42, 49, 55, 0.94);
}

.button-primary:hover {
  background: var(--red-dark);
}

.button-secondary {
  color: var(--ink);
  border: 1px solid rgba(23, 27, 31, 0.18);
  background: rgba(255, 255, 255, 0.7);
}

.button-secondary:hover {
  border-color: rgba(159, 61, 53, 0.38);
  background: #fff;
}

.hero-bottom-note {
  position: absolute;
  z-index: 1;
  right: clamp(20px, 5vw, 56px);
  bottom: 34px;
  left: clamp(20px, 5vw, 56px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  border: 1px solid rgba(255, 255, 255, 0.44);
  background: rgba(255, 255, 255, 0.52);
  backdrop-filter: blur(14px);
}

.hero-bottom-note span {
  padding: 16px 18px;
  color: var(--steel);
  font-weight: 900;
  text-align: center;
}

.section {
  padding: clamp(72px, 7vw, 104px) 20px;
  scroll-margin-top: 82px;
}

.section-inner {
  width: min(var(--max), 100%);
  margin: 0 auto;
}

.section-heading {
  max-width: 1040px;
  margin-bottom: 34px;
}

.section-heading p:not(.eyebrow) {
  max-width: 1040px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 18px;
  text-wrap: pretty;
}

.product-section {
  background: #fff;
}

.product-section .section-inner {
  width: min(var(--product-max), 100%);
}

.product-rail-wrap {
  position: relative;
}

.product-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: clamp(300px, 17vw, 340px);
  gap: 18px;
  margin: 0 -4px;
  padding: 2px 4px 18px;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-inline: contain;
  scroll-snap-type: x proximity;
  scrollbar-color: rgba(159, 61, 53, 0.42) rgba(23, 27, 31, 0.08);
  scroll-behavior: smooth;
}

.product-rail:focus-visible {
  outline: 2px solid rgba(159, 61, 53, 0.5);
  outline-offset: 6px;
}

.product-rail::-webkit-scrollbar {
  height: 10px;
}

.product-rail::-webkit-scrollbar-track {
  border-radius: 999px;
  background: rgba(23, 27, 31, 0.08);
}

.product-rail::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: rgba(159, 61, 53, 0.42);
}

.rail-control {
  position: absolute;
  z-index: 4;
  top: calc(50% - 18px);
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 12px 28px rgba(20, 26, 32, 0.16);
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, opacity 160ms ease;
}

.rail-control:hover {
  transform: translateY(-1px);
  background: #fff;
}

.rail-control:disabled {
  opacity: 0.34;
  box-shadow: none;
  cursor: default;
  transform: none;
}

.rail-control:focus-visible {
  outline: 2px solid rgba(159, 61, 53, 0.5);
  outline-offset: 3px;
}

.rail-control-prev {
  left: -21px;
}

.rail-control-next {
  right: -21px;
}

.product-tile {
  position: relative;
  min-height: clamp(520px, 30vw, 600px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #000;
  color: #fff;
  scroll-snap-align: start;
  isolation: isolate;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.product-tile:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.product-tile::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.06) 0%, rgba(0, 0, 0, 0.18) 42%, rgba(0, 0, 0, 0.74) 100%);
}

.product-tile img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.02);
  transition: transform 220ms ease;
}

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

.product-tile span,
.product-tile h3,
.product-tile p {
  position: relative;
  margin-left: 24px;
  margin-right: 24px;
}

.product-tile span {
  display: inline-flex;
  margin-top: clamp(312px, 21vw, 392px);
  color: rgba(255, 255, 255, 0.76);
  font-weight: 900;
}

.product-tile h3 {
  margin-top: 10px;
  font-size: 28px;
}

.product-tile p {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.82);
  text-wrap: balance;
}

.rail-hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.case-section {
  padding-top: 56px;
  background: var(--soft);
}

.compact-heading {
  max-width: 740px;
}

.case-section .section-heading {
  margin-bottom: 28px;
}

.engineering-showcase {
  display: grid;
  gap: 18px;
}

.engineering-stage {
  display: grid;
  grid-template-columns: minmax(0, 58%) minmax(0, 42%);
  align-items: stretch;
  height: clamp(500px, 41vw, 600px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  transition: grid-template-columns 420ms cubic-bezier(0.2, 0.76, 0.24, 1);
}

.engineering-stage[data-media-layout="wide"] {
  grid-template-columns: minmax(0, 72%) minmax(0, 28%);
}

.engineering-stage-trigger {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: #e3e6e8;
  cursor: zoom-in;
}

.engineering-stage-trigger:focus-visible {
  outline: 3px solid rgba(159, 61, 53, 0.68);
  outline-offset: -3px;
}

.engineering-stage-trigger:disabled {
  cursor: default;
}

.engineering-stage-trigger img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.9) contrast(1.02);
  transition:
    opacity 280ms ease,
    transform 520ms cubic-bezier(0.2, 0.76, 0.24, 1);
}

.engineering-stage-trigger img.is-changing {
  opacity: 0.72;
  transform: scale(1.018);
}

.engineering-stage-caption {
  display: grid;
  align-content: center;
  min-width: 0;
  height: 100%;
  padding: clamp(28px, 3.4vw, 48px);
  border-left: 1px solid var(--line);
}

.engineering-stage[data-media-layout="wide"] .engineering-stage-caption {
  padding-inline: clamp(24px, 2.8vw, 40px);
}

.engineering-stage-caption > div {
  min-width: 0;
}

.engineering-stage-index {
  margin: 0 0 6px;
  color: var(--red);
  font-weight: 900;
}

.engineering-stage-caption h3 {
  font-size: clamp(24px, 2.2vw, 32px);
}

.engineering-stage-description {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.engineering-stage-facts {
  margin: 28px 0 0;
  border-top: 1px solid var(--line);
}

.engineering-stage-facts div {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.engineering-stage-facts dt,
.engineering-stage-facts dd {
  margin: 0;
}

.engineering-stage-facts dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.engineering-stage-facts dd {
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.55;
}

.engineering-gallery-toolbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 4px 2px 0;
}

.engineering-gallery-toolbar h3,
.engineering-gallery-toolbar p {
  margin: 0;
}

.engineering-gallery-toolbar h3 {
  font-size: 18px;
}

.engineering-gallery-toolbar p {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.engineering-thumbnail-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: calc((100% - 48px) / 4);
  gap: 16px;
  padding: 10px 3px 12px;
  overflow-x: auto;
  overflow-y: visible;
  overscroll-behavior-inline: contain;
  scroll-snap-type: inline proximity;
  scrollbar-width: thin;
  scrollbar-color: rgba(159, 61, 53, 0.45) transparent;
}

.engineering-thumb {
  min-width: 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: zoom-in;
  scroll-snap-align: start;
  transform-origin: center;
  backface-visibility: hidden;
  will-change: transform;
  transition:
    transform 360ms cubic-bezier(0.2, 0.76, 0.24, 1),
    border-color 280ms ease,
    box-shadow 360ms ease;
}

.engineering-thumb:hover,
.engineering-thumb:focus-visible {
  z-index: 1;
  border-color: rgba(159, 61, 53, 0.72);
  box-shadow: 0 10px 22px rgba(30, 35, 39, 0.09);
  transform: translateY(-3px) scale(1.02);
}

.engineering-thumb:focus-visible {
  outline: 3px solid rgba(159, 61, 53, 0.28);
  outline-offset: 2px;
}

.engineering-thumb.is-active {
  border-color: var(--red);
}

.engineering-thumb-media {
  display: block;
  height: auto;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 7px 7px 0 0;
  background: #dfe3e6;
}

.engineering-thumb-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
  filter: saturate(0.9) contrast(1.02);
  will-change: transform;
  transition: transform 520ms cubic-bezier(0.2, 0.76, 0.24, 1);
}

.engineering-thumb:hover .engineering-thumb-media img,
.engineering-thumb:focus-visible .engineering-thumb-media img {
  transform: scale(1.025);
}

.engineering-thumb-copy {
  display: grid;
  gap: 4px;
  min-height: 64px;
  padding: 10px 14px 12px;
}

.engineering-thumb-copy span {
  color: var(--red);
  font-size: 13px;
  font-weight: 900;
}

.engineering-thumb-copy strong {
  font-size: 16px;
  line-height: 1.4;
}

.gallery-lightbox-frame {
  grid-column: 2;
  grid-row: 2;
  justify-self: center;
  margin: 0;
  max-width: min(1440px, calc(100vw - 112px));
}

.gallery-lightbox-frame img {
  width: auto;
  max-width: 100%;
  max-height: min(82vh, 900px);
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.34);
}

.gallery-lightbox-frame figcaption {
  min-height: 28px;
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 700;
  text-align: center;
}

.gallery-lightbox-close,
.gallery-lightbox-arrow {
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.74);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

.gallery-lightbox-close:hover,
.gallery-lightbox-close:focus-visible,
.gallery-lightbox-arrow:hover,
.gallery-lightbox-arrow:focus-visible {
  border-color: #fff;
  background: #fff;
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.24);
}

.gallery-lightbox-close {
  position: absolute;
  top: clamp(16px, 3vw, 30px);
  right: clamp(16px, 3vw, 30px);
  width: 44px;
  height: 44px;
  font-size: 30px;
  line-height: 1;
}

.gallery-lightbox-arrow {
  position: absolute;
  top: 50%;
  width: 48px;
  height: 48px;
  font-size: 0;
  line-height: 0;
  transform: translateY(-50%);
}

.gallery-lightbox-arrow::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 15px;
  height: 15px;
  border-top: 4px solid currentColor;
  border-left: 4px solid currentColor;
}

.gallery-lightbox-prev::before {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.gallery-lightbox-next::before {
  transform: translate(-50%, -50%) rotate(135deg);
}

.gallery-lightbox-prev {
  left: clamp(22px, 4vw, 52px);
}

.gallery-lightbox-next {
  right: clamp(22px, 4vw, 52px);
}

.gallery-lightbox-count {
  position: absolute;
  left: 50%;
  bottom: clamp(18px, 3vw, 30px);
  min-width: 68px;
  padding: 7px 12px;
  border-radius: 8px;
  color: #fff;
  background: rgba(0, 0, 0, 0.28);
  font-weight: 800;
  text-align: center;
  transform: translateX(-50%);
}

.service-section {
  background: #fff;
}

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

.service-flow article {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  outline: none;
  transform-origin: center;
  backface-visibility: hidden;
  will-change: transform;
  transition:
    transform 360ms cubic-bezier(0.2, 0.76, 0.24, 1),
    border-color 280ms ease,
    box-shadow 360ms ease;
  transition-delay: 0ms;
}

.service-flow article:hover,
.service-flow article:focus-visible {
  z-index: 1;
  transform: translateY(-3px) scale(1.02);
  border-color: rgba(159, 61, 53, 0.72);
  box-shadow: 0 10px 22px rgba(30, 35, 39, 0.09);
}

.service-flow img {
  display: block;
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: 7px 7px 0 0;
  filter: saturate(0.9) contrast(1.02);
  will-change: transform;
  transition: transform 520ms cubic-bezier(0.2, 0.76, 0.24, 1);
  transition-delay: 0ms;
}

.service-flow h3,
.service-flow p {
  margin-left: 22px;
  margin-right: 22px;
}

.service-flow article:hover img,
.service-flow article:focus-visible img {
  transform: scale(1.025);
}

.service-flow h3 {
  margin-top: 22px;
}

.service-flow p {
  margin-top: 12px;
  margin-bottom: 24px;
  color: var(--muted);
}

.about-section {
  background: var(--soft);
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(520px, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.about-intro p:not(.eyebrow) {
  max-width: 720px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.commitments {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.commitments span {
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-weight: 800;
}

.about-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 210px;
  gap: 22px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 20px 48px rgba(20, 26, 32, 0.08);
  font-style: normal;
}

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

.contact-details h3 {
  font-size: 28px;
}

.contact-details a,
.contact-details span {
  color: var(--ink);
}

.contact-address {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  align-items: start;
}

.contact-address-value {
  min-width: 0;
  overflow-wrap: anywhere;
}

.qr-placeholder {
  display: grid;
  place-items: center;
  min-height: 210px;
  overflow: hidden;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.qr-placeholder img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 260px;
  object-fit: contain;
}

.map-viewport {
  position: relative;
  grid-column: 1 / -1;
  width: 100%;
  height: clamp(240px, 34vw, 360px);
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #eef1f2;
  isolation: isolate;
}

.map-viewport img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.015);
  animation: map-breathe 14s ease-in-out infinite alternate;
  transition: transform 700ms ease;
}

.map-viewport:hover img,
.map-viewport:focus-visible img {
  animation: none;
  transform: scale(1.07);
}

.map-company-marker {
  position: absolute;
  left: 70%;
  top: 66%;
  z-index: 2;
  display: flex;
  align-items: center;
  transform: translate(-12px, -50%);
  filter: drop-shadow(0 2px 5px rgb(0 0 0 / 22%));
}

.map-marker-dot {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border: 5px solid #fff;
  border-radius: 50% 50% 50% 0;
  background: var(--red);
  transform: rotate(-45deg);
}

.map-marker-label {
  margin-left: 5px;
  padding: 6px 9px;
  border-radius: 5px;
  background: rgb(255 255 255 / 94%);
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
}

.map-attribution {
  position: absolute;
  left: 8px;
  bottom: 7px;
  z-index: 2;
  padding: 3px 6px;
  border-radius: 3px;
  background: rgb(255 255 255 / 88%);
  color: #46515a;
  font-size: 10px;
  line-height: 1.25;
}

@keyframes map-breathe {
  from { transform: scale(1.015); }
  to { transform: scale(1.055); }
}

.map-actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.map-actions a {
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-weight: 900;
}

.site-footer {
  padding: 28px 20px;
  border-top: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
}

.footer-inner {
  width: min(var(--max), 100%);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

@media (max-width: 980px) {
  .site-header {
    min-height: 64px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: none;
    padding: 18px 20px 24px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 18px 32px rgba(20, 26, 32, 0.12);
  }

  .site-header.is-open .site-nav {
    display: grid;
    gap: 14px;
  }

  .hero-bottom-note,
  .service-flow {
    grid-template-columns: 1fr 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .engineering-stage {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 0.58fr);
  }

  .engineering-stage-caption {
    padding: 24px;
  }

  .engineering-stage-facts {
    margin-top: 20px;
  }

  .engineering-thumbnail-rail {
    grid-auto-columns: calc((100% - 32px) / 3);
  }

  .about-contact {
    grid-template-columns: minmax(0, 1fr) 200px;
  }
}

@media (max-width: 980px) {
  .engineering-stage {
    grid-template-columns: 1fr;
    height: auto;
    transition: none;
  }

  .engineering-stage-trigger {
    height: clamp(300px, 65vw, 520px);
  }

  .engineering-stage-caption {
    height: 320px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .engineering-stage[data-media-layout="wide"] {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .brand-logo {
    height: 48px;
    max-width: 92px;
  }

  .brand-text {
    font-size: 17px;
  }

  .concept-hero {
    min-height: 760px;
    align-items: flex-start;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(246, 247, 248, 0.96) 0%, rgba(246, 247, 248, 0.78) 46%, rgba(246, 247, 248, 0.92) 100%),
      linear-gradient(90deg, rgba(246, 247, 248, 0.92), rgba(246, 247, 248, 0.4));
  }

  .hero-content {
    width: calc(100% - 40px);
    margin: 0 auto;
    padding-top: 168px;
  }

  h1 {
    font-size: clamp(42px, 12vw, 56px);
  }

  h2 {
    font-size: clamp(30px, 10vw, 42px);
  }

  .hero-lead,
  .section-heading p:not(.eyebrow),
  .about-intro p:not(.eyebrow) {
    font-size: 16px;
  }

  .button {
    flex: 1 1 150px;
  }

  .hero-bottom-note {
    grid-template-columns: 1fr 1fr;
    bottom: 20px;
  }

  .hero-bottom-note span {
    padding: 12px 10px;
    font-size: 14px;
  }

  .section {
    padding: 74px 20px;
  }

  .product-rail {
    grid-auto-columns: minmax(272px, 82vw);
  }

  .rail-control {
    top: calc(50% - 28px);
    width: 38px;
    height: 38px;
    font-size: 26px;
  }

  .rail-control-prev {
    left: -10px;
  }

  .rail-control-next {
    right: -10px;
  }

  .product-tile {
    min-height: 470px;
  }

  .product-tile span {
    margin-top: 272px;
  }

  .service-flow img {
    height: 220px;
  }

  .engineering-showcase {
    gap: 14px;
  }

  .engineering-stage-caption {
    min-height: 304px;
    padding: 18px;
  }

  .engineering-stage-trigger {
    height: clamp(220px, 65vw, 300px);
  }

  .engineering-stage-caption h3 {
    font-size: 24px;
  }

  .engineering-stage-description {
    font-size: 14px;
    line-height: 1.7;
  }

  .engineering-stage-facts {
    margin-top: 16px;
  }

  .engineering-stage-facts div {
    grid-template-columns: 68px minmax(0, 1fr);
    gap: 8px;
    padding: 10px 0;
  }

  .engineering-gallery-toolbar {
    display: block;
  }

  .engineering-gallery-toolbar p {
    margin-top: 6px;
  }

  .engineering-thumbnail-rail {
    grid-auto-columns: calc((100% - 16px) / 3);
    gap: 8px;
    padding: 8px 2px 10px;
  }

  .engineering-thumb-media {
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .engineering-thumb-copy {
    min-height: 54px;
    padding: 8px;
  }

  .engineering-thumb-copy span {
    display: none;
  }

  .engineering-thumb-copy strong {
    display: -webkit-box;
    overflow: hidden;
    font-size: 12px;
    line-height: 1.45;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
  }

  .gallery-lightbox {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto 1fr;
    gap: 12px;
    padding: 64px 12px 60px;
  }

  .gallery-lightbox-frame {
    grid-column: 1;
    grid-row: 2;
    max-width: 100%;
  }

  .gallery-lightbox-frame img {
    max-width: 100%;
    max-height: 68vh;
  }

  .gallery-lightbox-arrow {
    width: 44px;
    height: 48px;
  }

  .gallery-lightbox-prev {
    left: 12px;
  }

  .gallery-lightbox-next {
    right: 12px;
  }

  .service-flow,
  .about-contact {
    grid-template-columns: 1fr;
  }

  .qr-placeholder {
    min-height: 190px;
  }

  .map-viewport {
    height: 280px;
  }

  .map-company-marker {
    left: 70%;
    top: 65%;
  }

  .map-marker-label {
    font-size: 12px;
  }

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

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

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

  .reveal-on-scroll {
    opacity: 1;
    transform: none;
  }

  .map-viewport img {
    animation: none;
    transform: none;
  }
}