:root {
  --ink: #172033;
  --muted: #5c677a;
  --line: #d8dee8;
  --blue: #1262b3;
  --blue-dark: #0b3c75;
  --cyan: #e8f4ff;
  --surface: #f6f8fb;
  --white: #ffffff;
  --green: #2d7b68;
  --shadow: 0 18px 45px rgba(22, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.topbar {
  display: flex;
  justify-content: center;
  gap: 28px;
  padding: 7px 24px;
  color: #d9eefc;
  background: #0b4053;
  font-size: 13px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  min-height: 72px;
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand img {
  width: 78px;
  height: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  padding: 8px 12px;
  font: inherit;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  align-items: center;
  gap: 48px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 24px 46px;
}

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

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

h1 {
  max-width: 680px;
  margin-bottom: 22px;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.25;
}

.hero-text {
  max-width: 650px;
  color: var(--muted);
  font-size: 18px;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--blue);
  font-weight: 800;
}

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

.button.secondary {
  color: var(--blue);
  background: var(--white);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 620px;
  margin: 34px 0 0;
}

.hero-stats div {
  padding: 16px 0;
  border-top: 2px solid var(--line);
}

.hero-stats dt {
  font-size: 28px;
  font-weight: 900;
  color: var(--blue-dark);
}

.hero-stats dd {
  margin: 0;
  color: var(--muted);
}

.hero-visual {
  position: relative;
  min-height: 420px;
  padding: 38px;
  background: linear-gradient(160deg, #eef7ff, #ffffff 55%, #eef4f8);
  border: 1px solid var(--line);
  overflow: hidden;
}

.hero-visual img {
  width: min(470px, 100%);
  margin: 0 auto;
  filter: drop-shadow(0 22px 26px rgba(18, 98, 179, 0.2));
}

.visual-note {
  position: absolute;
  right: 22px;
  bottom: 22px;
  max-width: 280px;
  padding: 12px 14px;
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  font-size: 14px;
  font-weight: 700;
}

.keyword-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px 54px;
}

.keyword-strip span {
  padding: 7px 13px;
  color: var(--blue-dark);
  background: var(--cyan);
  border: 1px solid #c7e2f6;
  font-size: 14px;
  font-weight: 700;
}

.section,
.split-section,
.contact-section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 68px 24px;
}

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

.section-heading p {
  color: var(--muted);
}

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

.product-card {
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
}

.product-card img {
  width: 100%;
  height: 210px;
  object-fit: contain;
  margin-bottom: 18px;
  background: var(--surface);
}

.product-card p,
.application-grid p,
.content-panel li,
.process-list span,
.contact-section p,
.footer p {
  color: var(--muted);
}

.product-card span {
  display: inline-block;
  margin-top: 10px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
}

.split-section {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 44px;
  align-items: center;
}

.image-panel img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.content-panel {
  padding: 36px;
  background: var(--surface);
  border: 1px solid var(--line);
}

.check-list {
  display: grid;
  gap: 14px;
  padding: 0;
  margin: 22px 0 0;
  list-style: none;
}

.check-list li {
  padding-left: 18px;
  border-left: 3px solid var(--blue);
}

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

.application-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
}

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

.application-grid h3,
.application-grid p {
  padding: 0 18px;
}

.application-grid h3 {
  padding-top: 18px;
}

.process {
  background: #0e2947;
  color: var(--white);
  max-width: none;
}

.process .section-heading,
.process-list {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.process .section-heading p,
.process-list span {
  color: #c2d8ea;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 0;
  list-style: none;
}

.process-list li {
  min-height: 180px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.process-list strong {
  display: block;
  margin-bottom: 12px;
  font-size: 20px;
}

.contact-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 34px;
  align-items: center;
}

.contact-card {
  flex-direction: column;
  align-items: stretch;
  padding: 28px;
  background: var(--cyan);
  border: 1px solid #c7e2f6;
}

.contact-card p {
  margin: 12px 0 0;
}

.footer {
  padding: 28px 24px;
  text-align: center;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.footer p {
  margin: 0 0 6px;
}

@media (max-width: 920px) {
  .topbar {
    display: none;
  }

  .nav {
    min-height: 66px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 24px 20px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

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

  .hero {
    gap: 30px;
    padding-top: 46px;
  }

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

@media (max-width: 620px) {
  .brand span {
    display: none;
  }

  h1 {
    font-size: 36px;
  }

  .hero-stats,
  .product-grid,
  .application-grid,
  .process-list {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 330px;
    padding: 22px;
  }

  .visual-note {
    position: static;
    margin-top: 14px;
  }

  .section,
  .split-section,
  .contact-section {
    padding: 48px 18px;
  }

  .content-panel {
    padding: 24px;
  }
}