:root {
  --background: #f8fbfa;
  --surface: #ffffff;
  --surface-soft: #eef6f4;
  --foreground: #172521;
  --muted: #63716d;
  --line: #dce8e5;
  --brand: #145d6d;
  --brand-deep: #0b3543;
  --accent: #c7a668;
  --accent-soft: #f3ead7;
  --blue: #1c5fba;
  --shadow: 0 24px 70px rgba(19, 50, 49, 0.11);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    linear-gradient(180deg, rgba(238, 246, 244, 0.8), transparent 620px),
    var(--background);
  color: var(--foreground);
  font-family:
    var(--font-geist-sans), "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

body::selection {
  background: rgba(20, 93, 109, 0.18);
}

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

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  padding: 14px 0;
  background: rgba(248, 251, 250, 0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(220, 232, 229, 0.7);
}

.brand-mark {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-mark span {
  color: var(--brand-deep);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
}

.brand-mark small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.site-nav nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav nav a {
  border-radius: 999px;
  color: #42524e;
  font-size: 14px;
  padding: 10px 14px;
  transition:
    background 180ms ease,
    color 180ms ease;
}

.site-nav nav a:hover,
.site-nav nav a:focus-visible {
  background: var(--surface-soft);
  color: var(--brand);
  outline: none;
}

.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(420px, 1fr);
  gap: 54px;
  width: min(1180px, calc(100% - 40px));
  min-height: calc(100vh - 72px);
  margin: 0 auto;
  padding: 58px 0 76px;
  align-items: center;
}

.hero-copy {
  animation: riseIn 620ms ease both;
}

.section-kicker {
  margin: 0 0 14px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-copy h1 {
  max-width: 620px;
  margin: 0;
  color: var(--brand-deep);
  font-size: clamp(44px, 6vw, 76px);
  font-weight: 850;
  line-height: 1.02;
}

.hero-lede {
  max-width: 610px;
  margin: 28px 0 0;
  color: #455551;
  font-size: 18px;
  line-height: 1.9;
}

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

.primary-action,
.secondary-action {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 750;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    background 180ms ease;
}

.primary-action {
  background: var(--brand);
  color: #fff;
  padding: 0 24px;
  box-shadow: 0 14px 34px rgba(20, 93, 109, 0.22);
}

.secondary-action {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--brand-deep);
  padding: 0 22px;
}

.primary-action:hover,
.secondary-action:hover,
.primary-action:focus-visible,
.secondary-action:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.primary-action:active,
.secondary-action:active {
  transform: translateY(0);
}

.hero-visual {
  position: relative;
  border-radius: 28px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: riseIn 760ms 80ms ease both;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.hero-carousel {
  aspect-ratio: 1 / 1;
}

.hero-carousel img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  animation: heroCarousel 12s infinite;
}

.hero-carousel img:nth-child(1) {
  animation-delay: 0s;
}

.hero-carousel img:nth-child(2) {
  animation-delay: 4s;
}

.hero-carousel img:nth-child(3) {
  animation-delay: 8s;
}

.intro-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto 96px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--line);
  box-shadow: 0 16px 50px rgba(19, 50, 49, 0.06);
}

.intro-band div {
  display: grid;
  gap: 8px;
  min-height: 118px;
  align-content: center;
  padding: 26px;
  background: rgba(255, 255, 255, 0.74);
}

.intro-band span {
  color: var(--muted);
  font-size: 13px;
}

.intro-band strong {
  color: var(--brand-deep);
  font-size: clamp(17px, 2vw, 24px);
}

.section-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 38px;
}

.section-heading h2,
.contact-section h2 {
  margin: 0;
  color: var(--brand-deep);
  font-size: clamp(34px, 4.2vw, 54px);
  font-weight: 830;
  line-height: 1.08;
}

.section-heading p:last-child,
.contact-section p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

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

.category-stack {
  display: grid;
  gap: 28px;
}

.category-block {
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(238, 246, 244, 0.5)),
    var(--surface);
  padding: 28px;
}

.category-heading {
  display: grid;
  gap: 12px;
  max-width: 760px;
  margin-bottom: 24px;
}

.category-heading h3 {
  margin: 0;
  color: var(--brand-deep);
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 820;
  line-height: 1.12;
}

.category-heading span {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.product-card {
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: 0 20px 54px rgba(19, 50, 49, 0.08);
}

.product-card-wide {
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1fr);
  grid-template-rows: auto;
}

.product-image {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--surface-soft);
}

.product-image img {
  width: 100%;
  height: 430px;
  object-fit: cover;
  object-position: top center;
  transition: transform 220ms ease;
}

.product-image-link span {
  position: absolute;
  right: 18px;
  bottom: 18px;
  border-radius: 999px;
  background: rgba(11, 53, 67, 0.86);
  color: #fff;
  font-size: 13px;
  font-weight: 760;
  padding: 9px 14px;
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.product-image-link:hover img,
.product-image-link:focus-visible img {
  transform: scale(1.025);
}

.product-image-link:hover span,
.product-image-link:focus-visible span {
  opacity: 1;
  transform: translateY(0);
}

.product-image-link:focus-visible {
  outline: 3px solid rgba(20, 93, 109, 0.28);
  outline-offset: -3px;
}

.product-card-wide .product-image img {
  height: 100%;
  min-height: 430px;
}

.product-copy {
  display: grid;
  gap: 16px;
  padding: 28px;
}

.product-copy p {
  margin: 0;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
}

.product-copy h3 {
  margin: 0;
  color: var(--brand-deep);
  font-size: 28px;
  line-height: 1.18;
}

.product-copy span {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.product-copy ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.product-copy li {
  border: 1px solid rgba(20, 93, 109, 0.16);
  border-radius: 999px;
  background: rgba(238, 246, 244, 0.8);
  color: var(--brand-deep);
  font-size: 13px;
  font-weight: 700;
  padding: 8px 12px;
}

.product-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.text-action,
.buy-action {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 760;
  transition:
    transform 180ms ease,
    background 180ms ease,
    border-color 180ms ease;
}

.text-action {
  border: 1px solid var(--line);
  color: var(--brand-deep);
  padding: 0 16px;
}

.buy-action {
  background: var(--accent);
  color: #fff;
  padding: 0 18px;
}

.text-action:hover,
.buy-action:hover,
.text-action:focus-visible,
.buy-action:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.text-action:hover,
.text-action:focus-visible {
  border-color: rgba(20, 93, 109, 0.32);
  background: rgba(238, 246, 244, 0.78);
}

.buy-action:hover,
.buy-action:focus-visible {
  background: #b5914f;
}

.advantage-section {
  padding-top: 72px;
}

.advantage-layout {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 26px;
  align-items: stretch;
}

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

.feature-item {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.78);
  padding: 24px;
}

.feature-item h3 {
  margin: 0;
  color: var(--brand-deep);
  font-size: 22px;
}

.feature-item p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.detail-panel {
  overflow: hidden;
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.detail-panel img {
  width: 100%;
  height: 100%;
  min-height: 460px;
  object-fit: cover;
}

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

.scene-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 18px 48px rgba(19, 50, 49, 0.06);
}

.scene-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.scene-card div {
  padding: 22px;
}

.scene-card h3 {
  margin: 0;
  color: var(--brand-deep);
  font-size: 22px;
}

.scene-card p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.contact-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto 42px;
  border-radius: 26px;
  background:
    linear-gradient(135deg, rgba(20, 93, 109, 0.1), rgba(199, 166, 104, 0.16)),
    var(--surface);
  padding: 44px;
}

.contact-section div {
  max-width: 760px;
}

.contact-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
}

.contact-list div {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  max-width: none;
  align-items: baseline;
}

.contact-list dt {
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
}

.contact-list dd {
  margin: 0;
  color: var(--brand-deep);
  font-size: 16px;
  font-weight: 650;
  line-height: 1.65;
}

.contact-list a:hover,
.contact-list a:focus-visible {
  color: var(--brand);
  text-decoration: underline;
  outline: none;
}

.filing-links {
  margin-top: 20px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.6;
}

.filing-links a {
  color: inherit;
}

.filing-links a:hover,
.filing-links a:focus-visible {
  color: var(--brand);
  text-decoration: underline;
  outline: none;
}

.contact-actions {
  justify-content: flex-end;
}

.product-detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1fr);
  gap: 54px;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 64px 0 74px;
  align-items: center;
}

.detail-copy {
  max-width: 640px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 26px;
  color: var(--brand);
  font-size: 14px;
  font-weight: 760;
}

.back-link:hover,
.back-link:focus-visible {
  text-decoration: underline;
  outline: none;
}

.detail-copy h1 {
  margin: 0;
  color: var(--brand-deep);
  font-size: clamp(42px, 5.2vw, 72px);
  font-weight: 850;
  line-height: 1.04;
}

.detail-copy > p:not(.section-kicker) {
  margin: 26px 0 0;
  color: #455551;
  font-size: 18px;
  line-height: 1.9;
}

.detail-hero-image {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.detail-hero-image img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: top center;
}

.detail-spec-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto 46px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--line);
}

.detail-spec-band div {
  display: grid;
  min-height: 92px;
  place-items: center;
  background: rgba(255, 255, 255, 0.76);
  padding: 18px;
  text-align: center;
}

.detail-spec-band span {
  color: var(--brand-deep);
  font-size: 17px;
  font-weight: 780;
}

.product-detail-section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 68px 0;
}

.detail-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.detail-feature-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.78);
  padding: 26px;
}

.detail-feature-card h3 {
  margin: 0;
  color: var(--brand-deep);
  font-size: 22px;
}

.detail-feature-card p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.use-case-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.use-case-list div {
  border: 1px solid rgba(20, 93, 109, 0.14);
  border-radius: 18px;
  background: rgba(238, 246, 244, 0.72);
  color: var(--brand-deep);
  font-weight: 720;
  line-height: 1.55;
  min-height: 96px;
  padding: 22px;
}

.detail-gallery-section {
  padding-top: 50px;
}

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

.detail-gallery img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: top center;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 18px 48px rgba(19, 50, 49, 0.06);
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes heroCarousel {
  0%,
  31% {
    opacity: 1;
  }

  36%,
  95% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-carousel img {
    animation: none;
  }

  .hero-carousel img:first-child {
    opacity: 1;
  }
}

@media (max-width: 980px) {
  .hero-section,
  .advantage-layout,
  .product-detail-hero {
    grid-template-columns: 1fr;
  }

  .hero-section {
    min-height: auto;
    padding-top: 34px;
  }

  .hero-visual {
    max-width: 680px;
  }

  .intro-band,
  .scene-grid {
    grid-template-columns: 1fr;
  }

  .product-grid,
  .product-card-wide {
    grid-template-columns: 1fr;
  }

  .product-image img {
    height: auto;
    max-height: 620px;
  }

  .product-card-wide .product-image img {
    min-height: 0;
  }

  .contact-section {
    align-items: flex-start;
    flex-direction: column;
  }

  .detail-spec-band,
  .detail-feature-grid,
  .use-case-list,
  .detail-gallery {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-nav {
    width: min(100% - 28px, 1180px);
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .site-nav nav {
    width: 100%;
    justify-content: space-between;
    gap: 2px;
  }

  .site-nav nav a {
    padding: 8px 9px;
  }

  .hero-section,
  .intro-band,
  .section-shell,
  .product-detail-hero,
  .product-detail-section,
  .detail-spec-band,
  .contact-section {
    width: min(100% - 28px, 1180px);
  }

  .hero-copy h1 {
    font-size: 41px;
  }

  .hero-lede {
    font-size: 16px;
  }

  .hero-visual {
    border-radius: 20px;
  }

  .intro-band {
    margin-bottom: 44px;
  }

  .section-shell,
  .product-detail-section {
    padding: 58px 0;
  }

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

  .product-copy,
  .category-block,
  .contact-section {
    padding: 24px;
  }

  .contact-section h2,
  .section-heading h2 {
    font-size: 32px;
  }

  .contact-list div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .detail-copy h1 {
    font-size: 38px;
  }

  .product-image-link span {
    opacity: 1;
    transform: none;
  }
}