:root {
  --ink: #171a1f;
  --muted: #646b77;
  --line: #e6e9ee;
  --red: #cf1f2e;
  --red-dark: #a81623;
  --steel: #2a3441;
  --paper: #f6f7f9;
  --white: #ffffff;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
  padding: 0 clamp(20px, 4vw, 58px);
  color: var(--white);
  background: rgba(12, 15, 19, 0.38);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  transition: background 0.25s ease, height 0.25s ease;
}

.site-header.is-scrolled {
  height: 68px;
  background: rgba(12, 15, 19, 0.94);
}

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

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  font-size: 24px;
  font-weight: 800;
  background: var(--red);
}

.brand strong,
.brand em {
  display: block;
  line-height: 1.2;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0;
}

.brand em {
  margin-top: 3px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 11px;
  font-style: normal;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  font-size: 15px;
}

.site-nav a {
  position: relative;
  padding: 28px 0;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  bottom: 20px;
  width: 0;
  height: 2px;
  background: var(--red);
  content: "";
  transition: width 0.2s ease;
}

.site-nav a:hover::after {
  width: 100%;
}

.language-link {
  min-height: 32px;
  padding: 4px 12px !important;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.42);
}

.language-link::after {
  display: none;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 6px 0;
  background: var(--white);
}

.hero {
  position: relative;
  min-height: 760px;
  overflow: hidden;
  color: var(--white);
}

.hero > img {
  width: 100%;
  height: 760px;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7, 12, 18, 0.88), rgba(7, 12, 18, 0.46) 54%, rgba(7, 12, 18, 0.18));
}

.hero-content {
  position: absolute;
  top: 50%;
  left: max(24px, calc((100vw - var(--max)) / 2));
  width: min(680px, calc(100vw - 48px));
  transform: translateY(-44%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--red);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(48px, 8vw, 92px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 560px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 26px;
  font-weight: 700;
  border: 1px solid currentColor;
}

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

.btn-primary:hover {
  background: var(--red-dark);
  border-color: var(--red-dark);
}

.btn-ghost {
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.46);
}

.btn-outline {
  color: var(--red);
  background: var(--white);
  border-color: var(--red);
}

.section,
.section-band {
  max-width: var(--max);
  margin: 0 auto;
  padding: 92px 24px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  max-width: none;
  padding: 0;
  background: var(--line);
}

.stat {
  min-height: 150px;
  padding: 34px 24px;
  text-align: center;
  background: var(--white);
}

.stat strong {
  display: block;
  color: var(--red);
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1;
}

.stat span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  gap: 70px;
  align-items: center;
}

.section h2 {
  margin: 0 0 22px;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.18;
}

.section h3 {
  margin: 0 0 14px;
  font-size: 22px;
  line-height: 1.3;
}

.section p {
  color: var(--muted);
  font-size: 16px;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.trust-row span {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 0 13px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 700;
  background: var(--paper);
  border-left: 3px solid var(--red);
}

.image-stack {
  position: relative;
  min-height: 440px;
}

.image-main {
  width: 78%;
  height: 410px;
  object-fit: cover;
  border: 10px solid var(--white);
  box-shadow: 0 26px 70px rgba(20, 28, 38, 0.18);
}

.image-float {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 54%;
  height: 250px;
  object-fit: cover;
  border: 10px solid var(--white);
  box-shadow: 0 26px 70px rgba(20, 28, 38, 0.2);
}

.dark-section {
  max-width: none;
  color: var(--white);
  background: var(--steel);
}

.dark-section .section-heading,
.dark-section .solution-grid {
  max-width: var(--max);
  margin-inline: auto;
}

.dark-section h2,
.dark-section h3 {
  color: var(--white);
}

.dark-section p {
  color: rgba(255, 255, 255, 0.68);
}

.section-heading {
  margin-bottom: 38px;
  text-align: center;
}

.section-heading p:not(.eyebrow) {
  max-width: 760px;
  margin: 0 auto;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.16);
}

.solution-grid article {
  min-height: 300px;
  padding: 34px 28px;
  background: rgba(255, 255, 255, 0.05);
}

.solution-grid span {
  display: inline-block;
  margin-bottom: 38px;
  color: var(--red);
  font-size: 34px;
  font-weight: 800;
}

.capability {
  max-width: none;
  background: var(--paper);
}

.capability > .section-heading,
.capability-layout {
  max-width: var(--max);
  margin-inline: auto;
}

.capability-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 44px;
  align-items: start;
}

.capability-text {
  padding: 34px 0;
}

.capability-text ul {
  margin: 26px 0 0;
  padding-left: 19px;
  color: var(--muted);
}

.capability-text li + li {
  margin-top: 12px;
}

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

.equipment-grid img {
  width: 100%;
  height: 210px;
  object-fit: cover;
  background: var(--white);
}

.products {
  padding-bottom: 112px;
}

.product-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 18px;
}

.product-card {
  min-height: 250px;
  padding: 18px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.product-card img {
  width: 100%;
  height: 170px;
  object-fit: contain;
  background: var(--white);
}

.product-card h3 {
  margin: 16px 0 0;
}

.product-card p {
  margin-bottom: 0;
}

.product-card.large {
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.product-card.large img {
  height: 330px;
}

.timeline-section {
  max-width: none;
  background: #11161d;
}

.timeline-section .section-heading,
.timeline {
  max-width: var(--max);
  margin-inline: auto;
}

.timeline-section h2 {
  color: var(--white);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 0 24px;
  list-style: none;
}

.timeline li {
  position: relative;
  min-height: 160px;
  padding: 28px 24px;
  color: var(--white);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}

.timeline li::before {
  position: absolute;
  top: -6px;
  left: 24px;
  width: 11px;
  height: 11px;
  background: var(--red);
  content: "";
}

.timeline strong {
  display: block;
  margin-bottom: 12px;
  color: var(--red);
  font-size: 28px;
}

.timeline span {
  color: rgba(255, 255, 255, 0.74);
}

.contact-section {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 54px;
  align-items: center;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.contact-panel {
  padding: 34px;
  background: var(--paper);
  border-left: 5px solid var(--red);
}

.contact-panel p {
  margin: 0 0 10px;
}

.icon-line {
  display: flex;
  align-items: center;
  gap: 8px;
}

.contact-icon {
  display: inline-grid;
  width: 22px;
  height: 22px;
  place-items: center;
  color: var(--red);
}

.contact-icon svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.contact-note {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  margin-top: 20px;
  padding: 0 18px;
  color: var(--white);
  font-weight: 700;
  background: var(--red);
}

.contact-panel .btn {
  margin-top: 20px;
}

.inquiry-panel {
  display: grid;
  gap: 26px;
}

.rfq-form {
  display: grid;
  gap: 14px;
}

.rfq-form label {
  display: grid;
  gap: 7px;
  color: var(--steel);
  font-size: 13px;
  font-weight: 700;
}

.rfq-form input,
.rfq-form textarea {
  width: 100%;
  border: 1px solid #d7dce3;
  background: var(--white);
  color: var(--ink);
  font: inherit;
}

.rfq-form input {
  height: 44px;
  padding: 0 12px;
}

.rfq-form textarea {
  min-height: 120px;
  padding: 11px 12px;
  resize: vertical;
}

.rfq-form input:focus,
.rfq-form textarea:focus {
  outline: 2px solid rgba(207, 31, 46, 0.18);
  border-color: var(--red);
}

.rfq-form .btn {
  width: fit-content;
  margin-top: 6px;
}

.company-contact {
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(24px, 5vw, 70px);
  color: rgba(255, 255, 255, 0.72);
  background: #0c0f13;
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 960px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 24px 22px;
    background: rgba(12, 15, 19, 0.98);
  }

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

  .site-nav a {
    padding: 14px 0;
  }

  .site-nav a::after {
    bottom: 10px;
  }

  .nav-toggle {
    display: block;
  }

  .stats,
  .solution-grid,
  .timeline {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .image-stack {
    min-height: 360px;
  }

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

@media (max-width: 640px) {
  .site-header {
    height: 66px;
    padding: 0 18px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

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

  .brand em {
    font-size: 10px;
  }

  .hero,
  .hero > img {
    min-height: 680px;
    height: 680px;
  }

  .hero-content {
    top: 52%;
  }

  .hero-copy {
    font-size: 17px;
  }

  .section,
  .section-band {
    padding: 66px 18px;
  }

  .stats,
  .solution-grid,
  .timeline,
  .product-grid,
  .equipment-grid {
    grid-template-columns: 1fr;
  }

  .stat {
    min-height: 126px;
  }

  .image-main,
  .image-float {
    position: static;
    width: 100%;
    height: 250px;
    margin-bottom: 14px;
  }

  .image-stack {
    min-height: 0;
  }

  .product-card.large img {
    height: 230px;
  }

  .site-footer {
    display: block;
  }

  .site-footer p + p {
    margin-top: 6px;
  }
}