body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #f4f6f8;
  color: #222;
  font-size: 20px;
  line-height: 1.8;
}

.page {
  max-width: 850px;
  margin: 40px auto;
  padding: 24px;
}

h1 {
  font-size: 42px;
}

h2 {
  font-size: 28px;
}

.intro {
  font-size: 22px;
}

.card {
  background: white;
  padding: 24px;
  margin: 24px 0;
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

a {
  font-size: 22px;
  color: #0057d8;
}