:root {
  --bg: #f6f7f8;
  --surface: #ffffff;
  --ink: #15191d;
  --muted: #5d6873;
  --line: #d9dee3;
  --brand: #c9102c;
  --steel: #28445a;
  --steel-dark: #1b2b37;
  --silver: #edf0f2;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header {
  min-height: 74px;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.brand span {
  font-size: 18px;
}

.brand strong {
  color: var(--steel-dark);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
  color: var(--steel-dark);
}

.nav a {
  text-decoration: none;
}

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

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 72px 32px 58px;
  min-height: calc(100vh - 74px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  align-items: center;
  gap: 52px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 22px;
  color: var(--steel-dark);
  font-size: clamp(42px, 7vw, 76px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  color: var(--steel-dark);
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  color: var(--steel-dark);
  font-size: 22px;
}

.lead {
  max-width: 650px;
  color: var(--muted);
  font-size: 19px;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.button {
  min-height: 46px;
  padding: 12px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--steel-dark);
  border-radius: 4px;
  text-decoration: none;
  font-weight: 700;
}

.button.primary {
  background: var(--steel-dark);
  color: #fff;
}

.button.secondary {
  background: transparent;
  color: var(--steel-dark);
}

.hero-panel {
  display: grid;
  gap: 18px;
}

.photo-placeholder {
  border: 1px solid #c5cdd4;
  background:
    linear-gradient(135deg, rgba(40, 68, 90, 0.92), rgba(21, 25, 29, 0.92)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.08) 0 1px, transparent 1px 18px);
  color: #fff;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 18px;
  min-height: 240px;
  overflow: hidden;
  position: relative;
}

.photo-placeholder::before {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.photo-placeholder span {
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
  font-weight: 700;
}

.product-photo {
  min-height: 390px;
}

.wide-photo {
  min-height: 320px;
}

.small-photo {
  min-height: 210px;
  margin-bottom: 22px;
}

.metrics {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--surface);
}

.metrics div {
  padding: 18px;
  border-right: 1px solid var(--line);
}

.metrics div:last-child {
  border-right: 0;
}

.metrics dt {
  color: var(--muted);
  font-size: 12px;
}

.metrics dd {
  margin: 6px 0 0;
  color: var(--steel-dark);
  font-weight: 700;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 70px 32px;
}

.intro-band {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 42px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.intro-band p:last-child,
.about-copy p,
.product-card p,
.split p,
.contact-box {
  color: var(--muted);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 28px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(340px, 1.12fr);
  gap: 48px;
  align-items: center;
}

.split.reverse {
  grid-template-columns: minmax(340px, 1.12fr) minmax(0, 0.88fr);
}

.about-copy {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.contact-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 38px;
  align-items: start;
  border-top: 1px solid var(--line);
}

.contact-box {
  background: var(--surface);
  border-left: 4px solid var(--brand);
  padding: 24px;
}

.contact-box p {
  margin-bottom: 12px;
}

.contact-box a {
  color: var(--steel);
  font-weight: 700;
}

.muted {
  color: var(--muted);
}

.site-footer {
  padding: 28px 32px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  background: var(--steel-dark);
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #fff;
}

@media (max-width: 860px) {
  .site-header {
    align-items: flex-start;
    padding: 14px 20px;
    flex-direction: column;
  }

  .nav {
    justify-content: flex-start;
    gap: 14px;
  }

  .hero,
  .intro-band,
  .split,
  .split.reverse,
  .about-copy,
  .contact-section,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 48px 20px;
  }

  .section {
    padding: 52px 20px;
  }

  h1 {
    font-size: 42px;
  }

  h2 {
    font-size: 28px;
  }

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

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

  .metrics div:last-child {
    border-bottom: 0;
  }

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