:root {
  font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
  color: #18202a;
  background: #eef4f8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.topbar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8vw;
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid #dce7ee;
}

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

.brand span {
  display: block;
  color: #6b7887;
  font-size: 13px;
  margin-top: 3px;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  background: #19ad57;
  font-weight: 700;
}

nav {
  display: flex;
  gap: 22px;
}

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

main {
  padding: 48px 8vw 80px;
}

.hero {
  min-height: 420px;
  display: flex;
  align-items: center;
}

.eyebrow {
  color: #19ad57;
  font-weight: 700;
}

h1 {
  max-width: 760px;
  font-size: 56px;
  line-height: 1.08;
  margin: 14px 0;
}

.summary {
  max-width: 680px;
  color: #596879;
  font-size: 18px;
  line-height: 1.8;
}

.actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
}

.button {
  border: 1px solid #c8d6df;
  border-radius: 8px;
  padding: 12px 18px;
  background: #fff;
}

.button.primary {
  color: #fff;
  border-color: #19ad57;
  background: #19ad57;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

article {
  background: #fff;
  border: 1px solid #dbe7ee;
  border-radius: 8px;
  padding: 24px;
}

article p {
  color: #657488;
  line-height: 1.8;
}

code {
  background: #edf4f8;
  border-radius: 4px;
  padding: 2px 5px;
}

@media (max-width: 900px) {
  .topbar {
    padding: 0 20px;
  }

  nav {
    display: none;
  }

  main {
    padding: 32px 20px 60px;
  }

  h1 {
    font-size: 38px;
  }

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