:root {
  --ink: #122033;
  --muted: #657184;
  --line: #d8e0ea;
  --paper: #ffffff;
  --soft: #f3f7fb;
  --deep: #10283f;
  --blue: #0e6fd8;
  --teal: #08a6a3;
  --amber: #e6a21a;
  --shadow: 0 24px 60px rgba(15, 35, 60, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  padding: 0.6rem 0.8rem;
  background: var(--paper);
  border: 1px solid var(--line);
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(216, 224, 234, 0.8);
}

.nav-shell {
  max-width: 1180px;
  min-height: 76px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 218px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  border-radius: var(--radius);
  font-weight: 800;
}

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

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
  font-size: 14px;
  color: #304056;
}

.nav-links a:hover,
.text-link:hover {
  color: var(--blue);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.language-switch {
  display: inline-flex;
  padding: 3px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.lang-btn {
  min-width: 44px;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 7px 9px;
  border-radius: 6px;
  cursor: pointer;
}

.lang-btn.is-active {
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 4px 12px rgba(18, 32, 51, 0.08);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: var(--radius);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 14px 32px rgba(14, 111, 216, 0.24);
}

.button-secondary {
  color: var(--ink);
  background: var(--paper);
  border-color: var(--line);
}

.button-small {
  min-height: 38px;
  padding: 0 14px;
  font-size: 14px;
}

.section,
.section-band {
  max-width: 1180px;
  margin: 0 auto;
  padding: 88px 24px;
}

.section-band {
  max-width: none;
}

.hero {
  min-height: 720px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
  align-items: center;
  gap: 56px;
  padding-left: max(24px, calc((100vw - 1180px) / 2 + 24px));
  padding-right: max(24px, calc((100vw - 1180px) / 2 + 24px));
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.78)),
    linear-gradient(135deg, rgba(14, 111, 216, 0.14), rgba(8, 166, 163, 0.08) 45%, rgba(230, 162, 26, 0.12));
  overflow: hidden;
}

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

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(38px, 5vw, 72px);
  line-height: 1.06;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.25;
}

.hero-text,
.section-heading p,
.about-layout p,
.contact-layout p {
  color: var(--muted);
}

.hero-text {
  max-width: 760px;
  margin: 24px 0 0;
  font-size: 18px;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 42px 0 0;
  max-width: 680px;
}

.hero-stats div {
  padding: 18px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(216, 224, 234, 0.9);
  border-radius: var(--radius);
}

.hero-stats dt {
  font-weight: 900;
  font-size: 24px;
  color: var(--blue);
}

.hero-stats dd {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.hero-visual {
  min-height: 420px;
}

.hero-product-frame {
  position: relative;
  overflow: hidden;
  min-height: 430px;
  background:
    linear-gradient(135deg, rgba(14, 111, 216, 0.18), rgba(8, 166, 163, 0.1)),
    #f9fbfd;
  border: 1px solid rgba(216, 224, 234, 0.86);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.module-visual-track,
.module-visual-carriage,
.module-visual-shape {
  position: absolute;
}

.module-visual-shape {
  left: 12%;
  right: 12%;
  top: 45%;
  height: 44px;
  background: linear-gradient(90deg, #25384d, #6f8194, #23384d);
  border-radius: 6px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28);
}

.module-visual-track {
  left: 8%;
  right: 8%;
  top: 56%;
  height: 16px;
  background: var(--teal);
  border-radius: 20px;
}

.module-visual-carriage {
  left: 42%;
  top: 33%;
  width: 112px;
  height: 108px;
  background: linear-gradient(145deg, #f3f6f9, #9eabb8 45%, #26384d);
  border-radius: 7px;
  box-shadow: 0 20px 45px rgba(18, 32, 51, 0.22);
}

.hero-visual-caption {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  color: #314259;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(216, 224, 234, 0.92);
  border-radius: var(--radius);
  font-size: 13px;
}

.hero-visual-caption strong {
  color: var(--ink);
}

.section-muted {
  max-width: none;
  background: var(--soft);
}

.section-muted > * {
  max-width: 1132px;
  margin-left: auto;
  margin-right: auto;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-heading.compact {
  margin-bottom: 26px;
}

.trust-grid,
.component-grid,
.solution-grid,
.download-grid,
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.trust-grid article,
.component-grid article,
.solution-grid article,
.download-grid article,
.news-grid article,
.about-cards article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.trust-grid strong,
.solution-grid strong {
  display: block;
  font-size: 18px;
}

.trust-grid p,
.product-card p,
.component-grid p,
.download-grid p,
.news-grid p {
  color: var(--muted);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.product-card {
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 45px rgba(18, 32, 51, 0.08);
}

.product-figure {
  min-height: 230px;
  background:
    linear-gradient(90deg, rgba(16, 40, 63, 0.74), rgba(14, 111, 216, 0.54)),
    repeating-linear-gradient(90deg, #dce5ee 0 20px, #c9d5e1 20px 26px);
}

.cylinder-figure {
  background:
    radial-gradient(circle at 78% 34%, rgba(230, 162, 26, 0.85), transparent 18%),
    linear-gradient(90deg, rgba(16, 40, 63, 0.82), rgba(8, 166, 163, 0.55)),
    repeating-linear-gradient(0deg, #e8eef5 0 18px, #cfd9e4 18px 24px);
}

.product-content {
  padding: 26px;
}

.tag,
.file-type {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 9px;
  margin-bottom: 14px;
  color: #075b5a;
  background: rgba(8, 166, 163, 0.12);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
}

.product-card ul {
  padding-left: 20px;
  color: #405168;
}

.text-link {
  color: var(--blue);
  font-weight: 800;
}

.component-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 22px;
}

.solution-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.solution-grid article {
  min-height: 132px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.solution-grid span {
  color: var(--amber);
  font-weight: 900;
}

.section-dark {
  max-width: none;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(16, 40, 63, 0.96), rgba(18, 32, 51, 0.88)),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 24px);
}

.about-layout {
  max-width: 1132px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 34px;
  align-items: start;
}

.section-dark .eyebrow {
  color: #64d8cf;
}

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

.about-cards {
  display: grid;
  gap: 16px;
}

.about-cards article {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.download-grid .file-type {
  color: #8a5d00;
  background: rgba(230, 162, 26, 0.14);
}

.news-grid article time {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.contact-section {
  max-width: none;
  background: linear-gradient(180deg, #fff, #f8fbfe);
}

.contact-layout {
  max-width: 1132px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 42px;
  align-items: start;
}

.contact-points {
  display: grid;
  gap: 10px;
  margin-top: 28px;
}

.contact-points span {
  padding: 14px 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.inquiry-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.inquiry-form label {
  display: grid;
  gap: 7px;
  color: #314259;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
  background: #fff;
}

textarea {
  resize: vertical;
}

.form-wide,
.form-note {
  grid-column: 1 / -1;
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 38px 24px 72px;
  display: flex;
  justify-content: space-between;
  gap: 22px;
  border-top: 1px solid var(--line);
}

.site-footer p {
  color: var(--muted);
  margin: 6px 0 0;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.mobile-sticky-cta {
  display: none;
}

@media (max-width: 980px) {
  .nav-shell {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .nav-links,
  .nav-actions {
    display: none;
    width: 100%;
  }

  .nav-links.is-open,
  .nav-actions.is-open {
    display: grid;
    gap: 12px;
    padding-bottom: 16px;
  }

  .nav-links.is-open {
    align-items: stretch;
  }

  .hero,
  .about-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 70px;
  }

  .hero-visual {
    min-height: 320px;
  }

  .hero-product-frame,
  .hero-product-frame {
    min-height: 340px;
    height: 340px;
  }

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

@media (max-width: 640px) {
  .section,
  .section-band {
    padding: 64px 18px;
  }

  .brand {
    min-width: auto;
  }

  .brand small {
    display: none;
  }

  .hero-stats,
  .trust-grid,
  .product-grid,
  .component-grid,
  .solution-grid,
  .download-grid,
  .news-grid,
  .inquiry-form {
    grid-template-columns: 1fr;
  }

  .hero-actions .button {
    width: 100%;
  }

  .site-footer {
    flex-direction: column;
  }

  .mobile-sticky-cta {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: 14px;
    z-index: 12;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    color: #fff;
    background: var(--blue);
    border-radius: var(--radius);
    font-weight: 800;
    box-shadow: 0 18px 40px rgba(14, 111, 216, 0.32);
  }
}