body {
  margin: 0;
  background-color: #f5f7fb;
  color: #1f2937;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.card {
  width: 720px;
  margin: 48px auto;
  padding: 24px;
  background-color: #ffffff;
  border: 1px solid #dbe3ee;
  border-radius: 16px;
}

h1 {
  color: #1d4ed8;
  font-size: 32px;
}

.intro {
  font-size: 16px;
  line-height: 1.8;
}

.note {
  background-color: #e0f2fe;
  color: #0f172a;
  padding: 12px;
  border-radius: 10px;
}

.important {
  color: #b45309;
  font-weight: 700;
}