:root {
  --blue: #2a6bd3;
  --blue-dark: #174b9d;
  --ink: #152033;
  --muted: #5e6b7d;
  --line: #dbe4f1;
  --soft: #f4f7fb;
  --white: #ffffff;
  --steel: #263446;
  --accent: #18a4a6;
  --warning: #b77812;
  --shadow: 0 18px 45px rgba(24, 46, 80, 0.12);
  --radius: 8px;
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(219, 228, 241, 0.85);
  backdrop-filter: blur(14px);
}

.nav {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--blue), var(--accent));
  color: var(--white);
  font-weight: 800;
  letter-spacing: 0;
}

.brand-title {
  display: block;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.2;
}

.brand-subtitle {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  font-size: 22px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--steel);
  font-size: 14px;
  white-space: nowrap;
}

.nav-links a {
  padding: 9px 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--blue);
  border-color: var(--blue);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
}

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

.btn.secondary {
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.16);
  color: var(--white);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(24, 46, 80, 0.12);
}

.hero {
  position: relative;
  min-height: 620px;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: var(--white);
  background: var(--steel);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg, rgba(9, 24, 45, 0.92) 0%, rgba(9, 24, 45, 0.72) 42%, rgba(9, 24, 45, 0.28) 100%), url("../images/hero-industrial.png");
  background-size: cover;
  background-position: center;
}

.hero-content {
  position: relative;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 120px;
}

.eyebrow {
  color: #9cd7ff;
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

.hero h1,
.page-hero h1 {
  margin: 18px 0 20px;
  max-width: 760px;
  font-size: clamp(40px, 7vw, 76px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero p {
  max-width: 680px;
  margin: 0 0 30px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 19px;
}

.hero-actions,
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.trust-strip {
  position: relative;
  width: min(1040px, calc(100% - 40px));
  margin: -76px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--white);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  overflow: hidden;
  z-index: 3;
}

.metric {
  padding: 26px 24px;
  border-right: 1px solid var(--line);
}

.metric:last-child {
  border-right: 0;
}

.metric strong {
  display: block;
  color: var(--blue);
  font-size: 30px;
  line-height: 1.1;
}

.metric span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 90px 0;
}

.section.soft {
  background: var(--soft);
}

.section.compact {
  padding: 52px 0 24px;
}

.inquiry-card {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 44px;
  align-items: center;
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
}

.inquiry-intro h3 {
  margin: 14px 0 12px;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
}

.inquiry-intro p {
  margin: 0;
  color: var(--muted);
}

.inquiry-card .field-grid + label {
  margin-top: 14px;
}

.inquiry-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 14px;
}

.inquiry-actions .form-note {
  margin: 0;
}

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

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.section-head h2,
.page-section h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-head p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 22px;
}

.grid.products {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

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

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

.card {
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(42, 107, 211, 0.35);
}

.product-visual,
.placeholder-visual {
  min-height: 150px;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 70% 28%, rgba(24, 164, 166, 0.22), transparent 28%),
    linear-gradient(135deg, #eef5ff, #ffffff 62%, #e7edf5);
}

.device {
  width: 92px;
  height: 112px;
  border: 2px solid rgba(42, 107, 211, 0.55);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff, #dce8f7);
  position: relative;
  box-shadow: 0 18px 30px rgba(24, 46, 80, 0.16);
}

.device::before,
.device::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  border-radius: 4px;
  background: rgba(42, 107, 211, 0.72);
}

.device::before {
  top: 20px;
  height: 18px;
}

.device::after {
  bottom: 24px;
  height: 38px;
  background: rgba(24, 164, 166, 0.6);
}

.card-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  padding: 22px;
}

.card-cta {
  margin-top: auto;
  padding-top: 16px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.3;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: #eef5ff;
  color: var(--blue-dark);
  font-size: 12px;
  font-weight: 700;
}

.notice {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border-radius: var(--radius);
  background: #fff7e8;
  color: var(--warning);
  font-size: 12px;
  font-weight: 800;
}

.application-band {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 30px;
  align-items: stretch;
}

.blue-panel {
  padding: 36px;
  border-radius: var(--radius);
  color: var(--white);
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
}

.blue-panel h2,
.blue-panel h3 {
  margin-top: 0;
}

.blue-panel p {
  color: rgba(255, 255, 255, 0.82);
}

.app-list {
  display: grid;
  gap: 14px;
}

.app-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.app-item h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.app-item p {
  margin: 0;
  color: var(--muted);
}

.page-hero {
  background: linear-gradient(135deg, #eef5ff, #ffffff 58%, #e9f7f7);
  border-bottom: 1px solid var(--line);
  padding: 72px 0;
}

.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.breadcrumb {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

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

.page-section {
  padding: 68px 0;
}

.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.filter-tabs button {
  min-height: 40px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--steel);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.filter-tabs button:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.filter-tabs button.is-active {
  border-color: var(--blue);
  background: var(--blue);
  color: var(--white);
}

.product-hero {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 42px;
  align-items: center;
}

.product-image-large {
  min-height: 420px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(90deg, rgba(42, 107, 211, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(42, 107, 211, 0.08) 1px, transparent 1px),
    #f8fbff;
  background-size: 32px 32px;
}

.product-image-large .device {
  width: 160px;
  height: 210px;
}

.product-summary h1 {
  margin: 8px 0 16px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

.product-summary .lead {
  color: var(--muted);
  font-size: 18px;
}

.anchor-nav {
  position: sticky;
  top: 72px;
  z-index: 15;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 0;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.anchor-nav a {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 700;
}

.content-block {
  margin-top: 26px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.content-block h2 {
  margin-top: 0;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
}

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

.spec-table th,
.spec-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.spec-table th {
  width: 34%;
  background: var(--soft);
  color: var(--steel);
}

.download-list {
  display: grid;
  gap: 14px;
}

.download-item {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.contact-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 28px;
  align-items: start;
}

.contact-card,
.form-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.contact-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

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

label {
  display: grid;
  gap: 7px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 800;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-height: 44px;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: var(--white);
}

textarea {
  min-height: 128px;
  resize: vertical;
}

.form-note {
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  color: rgba(255, 255, 255, 0.86);
  background: #10223c;
}

.footer-main {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 54px 0;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr 0.8fr;
  gap: 34px;
}

.footer-main h3,
.footer-main h4 {
  margin-top: 0;
  color: var(--white);
}

.footer-main a {
  display: block;
  margin: 8px 0;
  color: rgba(255, 255, 255, 0.78);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 0;
}

.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 13px;
}

.floating-cta {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 25;
  box-shadow: var(--shadow);
}

.hidden {
  display: none !important;
}

@media (max-width: 1080px) {
  .grid.products {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .nav {
    min-height: 64px;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
  }

  .nav-links {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 64px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-header.is-open .nav-links {
    display: flex;
  }

  .nav-actions .btn.primary {
    display: none;
  }

  .hero {
    min-height: 560px;
  }

  .hero-content {
    padding: 82px 0 110px;
  }

  .trust-strip,
  .grid.products,
  .grid.three,
  .grid.two,
  .application-band,
  .product-hero,
  .contact-layout,
  .footer-main,
  .field-grid,
  .inquiry-card {
    grid-template-columns: 1fr;
  }

  .metric {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .metric:last-child {
    border-bottom: 0;
  }

  .section-head {
    display: block;
  }

  .section-head p {
    margin-top: 10px;
  }

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

  .footer-bottom .container {
    display: block;
  }
}

@media (max-width: 560px) {
  .nav,
  .container,
  .hero-content,
  .footer-main,
  .trust-strip {
    width: min(100% - 28px, 1180px);
  }

  .brand {
    min-width: 0;
  }

  .brand-title {
    font-size: 15px;
  }

  .brand-subtitle {
    display: none;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 38px;
  }

  .section,
  .page-section {
    padding: 58px 0;
  }

  .download-item {
    align-items: flex-start;
    flex-direction: column;
  }

  .product-image-large {
    min-height: 310px;
  }

  .floating-cta {
    left: 14px;
    right: 14px;
  }
}