:root {
  color-scheme: light;
  --ink: #14212f;
  --muted: #5f6c7a;
  --line: #d8e0e8;
  --blue: #0a64b7;
  --blue-dark: #083f74;
  --green: #1f8a5b;
  --bg: #f6f8fb;
  --white: #ffffff;
  --shadow: 0 18px 42px rgba(18, 32, 48, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 10px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  background: var(--white);
  font-weight: 800;
  border-radius: 6px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.brand-mark img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

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

.brand strong {
  font-size: 18px;
}

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

nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #263747;
  font-size: 14px;
  white-space: nowrap;
}

nav a:hover {
  color: var(--blue);
}

.breadcrumb {
  width: min(1180px, calc(100% - 36px));
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--blue);
}

.page-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 34px;
  align-items: center;
  width: min(1180px, calc(100% - 36px));
  margin: 36px auto 0;
  padding: 34px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.page-hero img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 6px;
}

.page-hero h1 {
  color: var(--ink);
  font-size: clamp(34px, 4.4vw, 56px);
}

.page-hero .lead {
  color: var(--muted);
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.quick-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 13px;
  color: var(--blue-dark);
  background: #eef6ff;
  border: 1px solid #c8dff5;
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
}

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

.category-card {
  display: block;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.category-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.category-card div {
  padding: 18px;
}

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

.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}

.content-panel,
.side-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
}

.content-panel + .content-panel {
  margin-top: 18px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
}

.spec-table th,
.spec-table td {
  padding: 13px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec-table th {
  width: 28%;
  color: var(--blue-dark);
  background: #f4f8fc;
}

.faq-item {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  margin-top: 16px;
}

.faq-item:first-child {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.side-panel {
  position: sticky;
  top: 92px;
}

.side-panel a {
  color: var(--blue);
  font-weight: 700;
}

.side-panel ul {
  padding-left: 0;
  list-style: none;
}

.side-panel li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.hero {
  position: relative;
  min-height: calc(100vh - 72px);
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #101820;
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.66;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(5, 20, 34, 0.82), rgba(5, 20, 34, 0.42) 54%, rgba(5, 20, 34, 0.18));
}

.hero-copy {
  position: relative;
  z-index: 1;
  width: min(980px, calc(100% - 36px));
  margin: 0 auto;
  padding: 0 0 clamp(72px, 12vh, 132px);
  color: var(--white);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
}

.hero .eyebrow {
  color: #84e3af;
}

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

h1 {
  max-width: 920px;
  margin-bottom: 18px;
  font-size: clamp(42px, 5.2vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  font-size: clamp(18px, 2.2vw, 24px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.primary,
.secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 700;
}

.primary {
  background: var(--green);
  color: var(--white);
}

.secondary {
  border: 1px solid rgba(255, 255, 255, 0.72);
  color: var(--white);
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  max-width: 1180px;
  margin: -44px auto 0;
  position: relative;
  z-index: 2;
  background: var(--line);
  box-shadow: var(--shadow);
}

.facts div {
  background: var(--white);
  padding: 22px;
  min-height: 130px;
}

.facts strong {
  display: block;
  margin-bottom: 8px;
  color: var(--blue-dark);
}

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

.section {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 86px 0;
}

.section-head {
  margin-bottom: 28px;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 21px;
  line-height: 1.25;
}

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

.product-card {
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

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

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

.product-card p,
.solution-list p,
.factory-copy p,
.contact p,
.contact-panel dd {
  color: var(--muted);
}

ul {
  margin: 14px 0 0;
  padding-left: 19px;
}

.band {
  width: 100%;
  max-width: none;
  padding: 82px clamp(18px, 4vw, 56px);
  background: var(--white);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.band .section-head,
.solution-list {
  width: min(1180px, 100%);
  margin-left: auto;
  margin-right: auto;
}

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

.solution-list div {
  padding: 24px;
  background: #f7fafc;
  border-left: 4px solid var(--blue);
}

.factory,
.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 32px;
  align-items: center;
}

.factory img {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.contact-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

dl {
  margin: 0;
}

dt {
  margin-top: 14px;
  font-weight: 700;
}

dt:first-child {
  margin-top: 0;
}

dd {
  margin: 4px 0 0;
}

.contact-panel a {
  color: var(--blue);
  font-weight: 700;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 24px clamp(18px, 4vw, 56px);
  color: #d9e4ee;
  background: #102235;
  font-size: 14px;
}

footer p {
  margin: 0;
}

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

  nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    min-height: 720px;
  }

  .facts,
  .product-grid,
  .solution-list,
  .factory,
  .contact,
  .page-hero,
  .category-grid,
  .related-grid,
  .detail-layout {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }

  .facts {
    width: min(100% - 36px, 560px);
  }

  footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .brand small {
    display: none;
  }

  nav {
    gap: 12px;
    font-size: 13px;
  }

  h1 {
    font-size: 38px;
  }

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