* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f8fafc;
  color: #1e293b;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  line-height: 1.8;
}

main {
  max-width: 760px;
  margin: 80px auto;
  padding: 0 24px;
}

h1 {
  color: #2563eb;
}

section {
  margin-top: 36px;
  padding: 24px;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
}