:root {
  --ink: #1d1f23;
  --muted: #626a73;
  --line: #dde1e6;
  --paper: #f7f8f8;
  --surface: #ffffff;
  --steel: #3b4652;
  --accent: #b62324;
  --accent-dark: #8f191b;
  --green: #2f6f5e;
  --gold: #b58634;
  --shadow: 0 18px 50px rgba(18, 24, 31, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 10;
  padding: 10px 14px;
  background: var(--ink);
  color: white;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 24px;
  justify-content: space-between;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 210px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--accent);
  color: white;
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.3;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
  color: var(--steel);
  font-size: 14px;
}

.nav a,
.header-call {
  padding: 7px 0;
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.header-call:hover {
  border-color: var(--accent);
}

.header-call {
  color: var(--accent-dark);
  font-weight: 700;
  white-space: nowrap;
}

.hero {
  position: relative;
  min-height: 720px;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #151719;
}

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

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

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(12, 14, 16, 0.88) 0%, rgba(12, 14, 16, 0.58) 52%, rgba(12, 14, 16, 0.12) 100%),
    linear-gradient(0deg, rgba(12, 14, 16, 0.7) 0%, rgba(12, 14, 16, 0.04) 48%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 120px 0 54px;
  color: white;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #ffcd77;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 880px;
  margin-bottom: 20px;
  font-size: clamp(40px, 7vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 720px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(18px, 2.2vw, 24px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 46px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 20px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  font-weight: 700;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

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

.button.ghost:hover {
  background: rgba(255, 255, 255, 0.12);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  max-width: 980px;
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.28);
}

.hero-facts div {
  padding: 18px 24px 0 0;
}

.hero-facts dt {
  color: #ffcd77;
  font-size: 13px;
  font-weight: 800;
}

.hero-facts dd {
  margin: 6px 0 0;
  color: rgba(255, 255, 255, 0.86);
}

.section {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 84px 0;
}

.intro,
.split-section,
.quality {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(32px, 6vw, 84px);
}

.section h2,
.contact-section h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-copy p:not(.eyebrow),
.section-heading p,
.intro-text {
  color: var(--muted);
}

.intro-text p:last-child,
.section-heading p:last-child {
  margin-bottom: 0;
}

.media-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(240px, 1fr);
  gap: 22px;
  align-items: stretch;
}

figure {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
}

figure img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

figcaption {
  padding: 12px 14px;
  color: var(--muted);
  font-size: 13px;
}

.capability-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.capability-list li {
  padding: 22px;
  background: var(--surface);
  border-left: 4px solid var(--green);
  box-shadow: 0 8px 24px rgba(18, 24, 31, 0.06);
}

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

.capability-list strong {
  margin-bottom: 8px;
  font-size: 18px;
}

.capability-list span {
  color: var(--muted);
}

.products {
  border-top: 1px solid var(--line);
}

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

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

.product-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(18, 24, 31, 0.07);
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 2.55;
  object-fit: cover;
  background: #eceff2;
}

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

.product-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.product-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.geo-link-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.geo-link-panel a {
  min-height: 106px;
  padding: 18px;
  background: var(--ink);
  color: white;
  border-top: 4px solid var(--accent);
}

.geo-link-panel a:hover {
  background: var(--steel);
}

.geo-link-panel span {
  display: block;
  margin-bottom: 8px;
  color: #ffcd77;
  font-size: 13px;
  font-weight: 800;
}

.geo-link-panel strong {
  display: block;
  line-height: 1.35;
}

.quality {
  border-top: 1px solid var(--line);
}

.quality-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.quality-panel div {
  padding: 22px;
  background: var(--surface);
  border-top: 4px solid var(--gold);
}

.quality-panel span {
  display: block;
  margin-bottom: 12px;
  color: var(--gold);
  font-weight: 800;
}

.quality-panel strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.quality-panel p {
  margin-bottom: 0;
  color: var(--muted);
}

.applications {
  border-top: 1px solid var(--line);
}

.application-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.application-row span {
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--steel);
  font-weight: 700;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: clamp(28px, 6vw, 80px);
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto 80px;
  padding: 56px;
  background: var(--ink);
  color: white;
  box-shadow: var(--shadow);
}

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

.contact-card {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 26px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  font-style: normal;
}

.contact-card span {
  color: #ffcd77;
  font-size: 13px;
  font-weight: 800;
}

.contact-card strong,
.contact-card a {
  font-size: 28px;
  line-height: 1.2;
}

.contact-card a {
  color: white;
  font-weight: 800;
}

.contact-card p {
  margin-bottom: 14px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(18px, 4vw, 56px);
  color: var(--muted);
  background: var(--surface);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.page-hero {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 74px 0 34px;
}

.page-hero h1 {
  max-width: 900px;
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(34px, 5vw, 58px);
}

.page-hero p {
  max-width: 780px;
  color: var(--muted);
  font-size: 18px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 14px;
}

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

.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: clamp(28px, 5vw, 64px);
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto 78px;
}

.detail-main {
  display: grid;
  gap: 22px;
}

.detail-section {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.detail-section h2 {
  margin-bottom: 14px;
  font-size: 26px;
  line-height: 1.25;
}

.detail-section p,
.detail-section li {
  color: var(--muted);
}

.detail-section ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
}

.detail-image {
  margin-bottom: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.detail-image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.detail-sidebar {
  align-self: start;
  position: sticky;
  top: 92px;
  display: grid;
  gap: 14px;
}

.sidebar-card {
  padding: 22px;
  background: var(--ink);
  color: white;
}

.sidebar-card p {
  color: rgba(255, 255, 255, 0.78);
}

.sidebar-card a {
  color: white;
  font-size: 24px;
  font-weight: 800;
}

.related-links {
  display: grid;
  gap: 10px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.related-links a {
  color: var(--accent-dark);
  font-weight: 700;
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: 760px;
  }

  .hero-facts,
  .intro,
  .split-section,
  .quality,
  .media-grid,
  .contact-section {
    grid-template-columns: 1fr;
  }

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

  .geo-link-panel,
  .detail-layout {
    grid-template-columns: 1fr;
  }

  .detail-sidebar {
    position: static;
  }

  .contact-section {
    padding: 34px 24px;
  }
}

@media (max-width: 620px) {
  .brand {
    min-width: 0;
  }

  .hero {
    min-height: 780px;
  }

  .hero-content {
    padding-top: 90px;
  }

  .hero-facts div {
    padding-right: 0;
  }

  .section {
    padding: 62px 0;
  }

  .product-grid,
  .quality-panel,
  .geo-link-panel {
    grid-template-columns: 1fr;
  }

  figure img {
    height: 340px;
  }

  .contact-card strong,
  .contact-card a {
    font-size: 24px;
  }
}