:root {
  color: #172033;
  background: #f6f2ea;
  font-family:
    "Microsoft YaHei",
    "PingFang SC",
    "Inter",
    system-ui,
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: #f6f2ea;
}

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

.site-header {
  min-height: 72px;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid rgba(23, 32, 51, 0.12);
  background: rgba(246, 242, 234, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.brand {
  font-weight: 800;
  font-size: 18px;
}

nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #556070;
  font-size: 14px;
}

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

.hero {
  min-height: calc(100vh - 72px);
  padding: 72px 0 48px;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: 42px;
  align-items: center;
}

.hero-copy {
  display: grid;
  gap: 22px;
}

.eyebrow {
  margin: 0;
  color: #b91c1c;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 680px;
  font-size: clamp(44px, 7vw, 82px);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  font-size: 34px;
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  font-size: 18px;
  letter-spacing: 0;
}

.hero-copy p:not(.eyebrow),
.section p,
.download-band p,
.check-list {
  color: #556070;
  font-size: 17px;
  line-height: 1.75;
}

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

.primary-link,
.secondary-link {
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.primary-link {
  color: #ffffff;
  background: #1f3a5f;
}

.secondary-link {
  color: #1f3a5f;
  border: 1px solid rgba(31, 58, 95, 0.28);
  background: rgba(255, 255, 255, 0.46);
}

.hero-preview {
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid rgba(23, 32, 51, 0.16);
  border-radius: 8px;
  box-shadow: 0 24px 60px rgba(23, 32, 51, 0.16);
  background: #e9dcc9;
}

.hero-preview img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.section {
  padding: 70px 0;
  border-top: 1px solid rgba(23, 32, 51, 0.12);
}

.section-heading {
  max-width: 680px;
  display: grid;
  gap: 10px;
}

.steps {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.steps article {
  min-height: 210px;
  padding: 22px;
  border-radius: 8px;
  border: 1px solid rgba(23, 32, 51, 0.12);
  background: rgba(255, 255, 255, 0.54);
  display: grid;
  align-content: start;
  gap: 12px;
}

.steps span {
  color: #b91c1c;
  font-weight: 900;
}

.steps p {
  color: #5f6877;
  font-size: 15px;
  line-height: 1.7;
}

.split,
.download-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1fr);
  gap: 40px;
  align-items: start;
}

.split div,
.download-band div {
  display: grid;
  gap: 12px;
}

.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.check-list li {
  padding-left: 22px;
  position: relative;
}

.check-list li::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #b91c1c;
  position: absolute;
  left: 2px;
  top: 13px;
}

.download-band {
  margin: 40px 0 80px;
  padding: 34px;
  border-radius: 8px;
  color: #ffffff;
  background: #172033;
  align-items: center;
}

.download-band p,
.download-band .eyebrow {
  color: #dbe4f0;
}

.download-band .primary-link {
  justify-self: end;
  background: #b91c1c;
}

footer {
  min-height: 76px;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: #6b7280;
  border-top: 1px solid rgba(23, 32, 51, 0.12);
}

@media (max-width: 860px) {
  .site-header {
    padding: 0 20px;
    align-items: flex-start;
    justify-content: center;
    flex-direction: column;
    gap: 8px;
  }

  nav {
    padding-bottom: 14px;
  }

  main {
    width: min(100% - 28px, 720px);
  }

  .hero,
  .split,
  .download-band {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 44px;
  }

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

  .download-band .primary-link {
    justify-self: start;
  }

  footer {
    min-height: 92px;
    padding: 18px 20px;
    align-items: flex-start;
    flex-direction: column;
  }
}