:root {
  --ink: #0b1f2a;
  --muted: #60717d;
  --line: #d9e3e8;
  --panel: #ffffff;
  --soft: #eef6f7;
  --brand: #0b6f78;
  --brand-2: #1b8f83;
  --accent: #d77b27;
  --shadow: 0 18px 45px rgba(20, 53, 67, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f7fafb;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 16px 5vw;
  border-bottom: 1px solid rgba(217, 227, 232, 0.9);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: grid;
  grid-template-columns: 48px auto;
  column-gap: 12px;
  align-items: center;
}

.brand span {
  grid-row: span 2;
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, #053747, #0b6f78);
  font-weight: 800;
}

.brand strong {
  font-size: 18px;
  line-height: 1.1;
}

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

.nav {
  display: flex;
  justify-content: center;
  gap: 26px;
  color: #334852;
  font-size: 15px;
}

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

.nav-cta,
.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--brand);
  border-radius: 8px;
  padding: 10px 18px;
  color: #fff;
  background: var(--brand);
  font-weight: 700;
}

.button.secondary {
  color: var(--brand);
  background: #fff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.75fr);
  gap: 56px;
  align-items: center;
  padding: 86px 5vw 56px;
  background:
    linear-gradient(120deg, rgba(11, 111, 120, 0.08), rgba(255, 255, 255, 0.72)),
    radial-gradient(circle at 80% 20%, rgba(215, 123, 39, 0.12), transparent 34%);
}

.hero-cover {
  position: relative;
  overflow: hidden;
  min-height: calc(100svh - 81px);
  background:
    linear-gradient(90deg, rgba(247, 250, 251, 0.96) 0%, rgba(247, 250, 251, 0.88) 34%, rgba(247, 250, 251, 0.38) 62%, rgba(247, 250, 251, 0.12) 100%),
    url("../images/zh-hero-radiation-monitoring.png") center / cover no-repeat;
}

.hero-cover .hero-copy {
  max-width: 820px;
}

.hero-cover .hero-panel {
  align-self: end;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 900px;
  margin-bottom: 22px;
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.04;
  letter-spacing: 0;
}

.intro {
  max-width: 760px;
  color: #40545e;
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 720px;
}

.hero-stats span {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--muted);
}

.hero-stats strong {
  display: block;
  color: var(--ink);
  font-size: 24px;
}

.hero-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: #fff;
  box-shadow: var(--shadow);
}

.cover-card {
  overflow: hidden;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(11, 111, 120, 0.92), rgba(8, 49, 61, 0.94)),
    #0b6f78;
}

.cover-copy {
  padding: 20px 20px 10px;
  color: #fff;
}

.cover-copy span {
  display: block;
  margin-bottom: 7px;
  color: #bfe5e7;
  font-size: 13px;
  font-weight: 800;
}

.cover-copy strong {
  display: block;
  font-size: 21px;
  line-height: 1.35;
}

.cover-images {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 10px;
  align-items: stretch;
  padding: 10px;
}

.cover-images img {
  width: 100%;
  height: 155px;
  border-radius: 6px;
  background: #fff;
  object-fit: contain;
  padding: 12px;
}

.panel-top span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.panel-top strong {
  display: block;
  margin: 6px 0 18px;
  font-size: 22px;
  line-height: 1.3;
}

.matrix {
  display: grid;
  gap: 12px;
}

.matrix-card {
  display: grid;
  grid-template-columns: 50px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px;
  border-radius: 8px;
  background: var(--soft);
}

.matrix-card b {
  display: grid;
  width: 50px;
  height: 50px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
}

.matrix-card strong {
  display: block;
}

.matrix-card small {
  color: var(--muted);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  padding: 18px 5vw;
  border-block: 1px solid var(--line);
  background: #fff;
}

.trust-strip span {
  padding: 8px 14px;
  border-radius: 999px;
  background: #eef6f7;
  color: #34505a;
  font-weight: 700;
  font-size: 14px;
}

.section {
  padding: 72px 5vw;
}

.section.tinted {
  background: #eef5f6;
}

.landing-hero {
  background:
    linear-gradient(120deg, rgba(11, 111, 120, 0.10), rgba(255, 255, 255, 0.92)),
    #f7fafb;
}

.section-heading {
  max-width: 920px;
  margin-bottom: 30px;
}

.section-heading h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 3vw, 46px);
  line-height: 1.14;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.section-heading.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  max-width: none;
  align-items: end;
}

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

.solution-card,
.process-grid article,
.product-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 30px rgba(20, 53, 67, 0.07);
}

.solution-card {
  padding: 24px;
}

.solution-card .icon {
  display: grid;
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  font-weight: 800;
}

.solution-card h3 {
  margin-bottom: 8px;
  font-size: 21px;
}

.solution-card p,
.product-card p,
.process-grid p,
.contact-card p {
  color: var(--muted);
}

.product-tools {
  display: flex;
  gap: 10px;
}

.product-tools input,
.product-tools select {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 14px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.product-tools input {
  width: min(320px, 42vw);
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.category-tabs button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 14px;
  background: #fff;
  color: #38525b;
  cursor: pointer;
  font-weight: 700;
}

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

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

.product-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  overflow: hidden;
}

.product-image {
  display: grid;
  min-height: 220px;
  place-items: center;
  border-bottom: 1px solid var(--line);
  background: #f9fbfb;
}

.product-image img {
  width: 100%;
  height: 220px;
  object-fit: contain;
  padding: 18px;
}

.product-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 20px;
}

.product-category {
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
}

.product-card h3 {
  margin: 8px 0 10px;
  font-size: 21px;
  line-height: 1.3;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: 16px;
}

.tags span {
  border-radius: 999px;
  padding: 5px 10px;
  background: #eef6f7;
  color: #42606b;
  font-size: 12px;
  font-weight: 700;
}

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

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.static-grid {
  align-items: stretch;
}

.article-page {
  max-width: 960px;
  margin: 0 auto;
}

.article-body {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(22px, 4vw, 42px);
  background: #fff;
  box-shadow: 0 12px 30px rgba(20, 53, 67, 0.07);
}

.article-body h2 {
  margin-top: 28px;
  font-size: 26px;
}

.article-body li {
  margin-bottom: 8px;
  color: var(--muted);
}

.process-grid article {
  padding: 24px;
}

.process-grid strong {
  color: var(--accent);
  font-size: 28px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.45fr);
  gap: 28px;
  align-items: center;
  padding: 72px 5vw;
  color: #fff;
  background: #07313d;
}

.contact-section .eyebrow,
.contact-section p {
  color: #b8d5dc;
}

.contact-section h2 {
  max-width: 760px;
  font-size: clamp(30px, 3vw, 46px);
  line-height: 1.15;
}

.contact-card {
  padding: 24px;
  background: #fff;
  color: var(--ink);
}

.contact-card .button {
  width: 100%;
  margin-bottom: 10px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 5vw;
  background: #041e28;
  color: #cfe0e4;
}

@media (max-width: 1080px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .nav {
    display: none;
  }

  .hero,
  .contact-section,
  .section-heading.split {
    grid-template-columns: 1fr;
  }

  .hero-cover {
    background:
      linear-gradient(180deg, rgba(247, 250, 251, 0.96) 0%, rgba(247, 250, 251, 0.9) 44%, rgba(247, 250, 251, 0.7) 100%),
      url("../images/zh-hero-radiation-monitoring.png") center top / cover no-repeat;
  }

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

@media (max-width: 720px) {
  .site-header {
    padding: 12px 18px;
  }

  .brand small,
  .nav-cta {
    display: none;
  }

  .hero,
  .section,
  .contact-section {
    padding-inline: 20px;
  }

  .hero {
    padding-top: 52px;
    padding-bottom: 34px;
  }

  h1 {
    font-size: 32px;
  }

  .intro {
    font-size: 16px;
  }

  .hero-cover {
    min-height: auto;
  }

  .hero-cover .hero-panel {
    display: none;
  }

  .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .hero-stats span {
    padding: 10px 8px;
    font-size: 12px;
  }

  .hero-stats strong {
    font-size: 18px;
  }

  .solution-grid,
  .product-grid,
  .process-grid {
    grid-template-columns: 1fr;
  }

  .product-tools {
    flex-direction: column;
  }

  .product-tools input {
    width: 100%;
  }

  .cover-images {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .cover-images img {
    height: 96px;
    padding: 8px;
  }

  footer {
    flex-direction: column;
  }
}