* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: #1f2933;
  background: #f6f7f9;
  font-family: Arial, "Helvetica Neue", "Hiragino Sans GB", "Heiti SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 72px;
  padding: 0 clamp(20px, 6vw, 84px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid #e5e7eb;
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 20px;
}

.brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #4b5563;
  font-size: 15px;
}

.nav a:hover {
  color: #d9232e;
}

.hero {
  min-height: 0;
  padding: clamp(46px, 6vw, 72px) clamp(20px, 6vw, 84px) 52px;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(340px, 0.98fr);
  align-items: center;
  gap: clamp(28px, 6vw, 76px);
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.54)),
    linear-gradient(135deg, #f8fafc 0%, #f1f5f9 44%, #fef2f2 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: #d9232e;
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  color: #111827;
  font-size: clamp(34px, 4.8vw, 58px);
  line-height: 1.12;
  font-weight: 900;
}

.hero-text {
  max-width: 680px;
  margin-bottom: 32px;
  color: #4b5563;
  font-size: 19px;
  line-height: 1.8;
}

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

.primary-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 6px;
  font-weight: 800;
}

.primary-link {
  color: #ffffff;
  background: #d9232e;
}

.secondary-link {
  color: #1f2933;
  border: 1px solid #cbd5e1;
  background: #ffffff;
}

.hero-visual {
  position: relative;
  min-height: 380px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

.sheet {
  position: absolute;
  width: 44%;
  aspect-ratio: 0.72;
  border: 1px solid #dbe2ea;
  background:
    linear-gradient(#ffffff, #ffffff) padding-box,
    repeating-linear-gradient(0deg, #e5e7eb 0 10px, transparent 10px 22px);
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.12);
}

.sheet::before {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  top: 15%;
  height: 12px;
  background: #d9232e;
}

.sheet::after {
  content: "";
  position: absolute;
  left: 12%;
  right: 18%;
  top: 26%;
  height: 46%;
  background: repeating-linear-gradient(0deg, #dbe2ea 0 8px, transparent 8px 19px);
}

.sheet-a {
  left: 13%;
  top: 12%;
  transform: rotate(-7deg);
}

.sheet-b {
  right: 13%;
  top: 22%;
  transform: rotate(8deg);
}

.product-strip {
  position: absolute;
  left: 12%;
  right: 12%;
  bottom: 36px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 18px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: rgba(248, 250, 252, 0.94);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.12);
}

.product-strip figure {
  margin: 0;
  min-width: 0;
}

.product-strip img {
  display: block;
  width: 100%;
  aspect-ratio: 1.18;
  object-fit: cover;
  border: 1px solid #dbe2ea;
  border-radius: 6px;
  background: #ffffff;
}

.product-strip figcaption {
  margin-top: 8px;
  overflow: hidden;
  color: #374151;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.section {
  padding: 76px clamp(20px, 6vw, 84px);
  background: #ffffff;
}

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

h2 {
  color: #111827;
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 1.18;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.service-item {
  min-height: 220px;
  padding: 24px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #ffffff;
}

.service-item img {
  width: 54px;
  height: 54px;
  object-fit: contain;
  margin-bottom: 22px;
}

.service-item h3,
.step h3 {
  margin-bottom: 10px;
  color: #111827;
  font-size: 21px;
}

.service-item p,
.step p,
.contact-intro {
  color: #5b6675;
  line-height: 1.72;
}

.band {
  background: #f8fafc;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.step {
  padding: 0 6px;
}

.step span {
  display: block;
  margin-bottom: 16px;
  color: #d9232e;
  font-size: 30px;
  font-weight: 900;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(360px, 1.2fr);
  gap: 48px;
  align-items: start;
}

.contact-list {
  display: grid;
  gap: 16px;
}

.contact-list div {
  padding-bottom: 16px;
  border-bottom: 1px solid #e5e7eb;
}

.contact-list span {
  display: block;
  margin-bottom: 8px;
  color: #6b7280;
  font-size: 14px;
}

.contact-list strong {
  color: #111827;
  font-size: 20px;
  line-height: 1.5;
}

.site-footer {
  padding: 28px clamp(20px, 6vw, 84px);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: #6b7280;
  background: #111827;
  font-size: 14px;
}

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

@media (max-width: 920px) {
  .site-header {
    height: auto;
    padding-top: 14px;
    padding-bottom: 14px;
    align-items: flex-start;
    gap: 14px;
    flex-direction: column;
  }

  .nav {
    width: 100%;
    gap: 18px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 34px;
  }

  .hero-visual {
    min-height: 290px;
  }

  .product-strip {
    left: 7%;
    right: 7%;
    bottom: 20px;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    padding: 12px;
  }

  .product-strip img {
    aspect-ratio: 1.45;
  }

  .product-strip figcaption {
    margin-top: 5px;
    font-size: 12px;
  }

  .service-grid,
  .steps,
  .contact-section {
    grid-template-columns: 1fr;
  }

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