:root {
  color: #1d2430;
  background: #eef3f8;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
}

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

.topbar {
  width: min(1180px, calc(100vw - 48px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-mark {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: #2563eb;
  color: #fff;
  font-size: 22px;
  font-weight: 800;
}

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

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

.brand small {
  margin-top: 3px;
  color: #6d7684;
  font-size: 13px;
}

.top-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.top-actions a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid #cbd8e7;
  border-radius: 8px;
  background: #fff;
  font-weight: 700;
}

main {
  width: min(1180px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 36px 0 72px;
}

.hero {
  min-height: 520px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: 52px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 16px;
  color: #2563eb;
  font-size: 15px;
  font-weight: 800;
}

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

h1 {
  max-width: 760px;
  font-size: 54px;
  line-height: 1.12;
  letter-spacing: 0;
}

.summary {
  max-width: 660px;
  margin-top: 24px;
  color: #5d6673;
  font-size: 20px;
  line-height: 1.75;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 800;
}

.button.primary {
  background: #2563eb;
  color: #fff;
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.22);
}

.button.secondary {
  color: #1d2430;
  background: #fff;
  border: 1px solid #cbd8e7;
}

.preview-card {
  margin: 0;
  padding: 16px;
  border: 1px solid #cfdae7;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 22px 50px rgba(30, 45, 68, 0.1);
}

.preview-card img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.download-section,
.intro-section {
  margin-top: 40px;
}

.section-heading {
  max-width: 760px;
}

.section-heading h2,
.intro-section h2 {
  font-size: 30px;
  line-height: 1.25;
}

.section-heading p:not(.eyebrow),
.intro-section p,
.download-card p {
  color: #5d6673;
  font-size: 16px;
  line-height: 1.7;
}

.section-heading p:not(.eyebrow) {
  margin-top: 12px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.download-card,
.intro-section article {
  border: 1px solid #d5dfeb;
  border-radius: 8px;
  background: #fff;
}

.download-card {
  min-height: 250px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 22px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  color: #0b5ec9;
  background: #e7f1ff;
  font-size: 13px;
  font-weight: 800;
}

.download-card h3 {
  margin-top: 16px;
  font-size: 24px;
}

.download-card p {
  margin-top: 10px;
}

.intro-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.intro-section article {
  padding: 24px;
}

.intro-section p {
  margin-top: 12px;
}

@media (max-width: 860px) {
  .topbar,
  main {
    width: min(100vw - 32px, 1180px);
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .hero,
  .download-grid,
  .intro-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 30px;
  }

  h1 {
    font-size: 38px;
  }

  .summary {
    font-size: 17px;
  }
}