* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #222;
  background: #fff;
  padding: 24px 16px 40px;
  line-height: 1.7;
}

.container {
  width: min(900px, 100%);
  margin: 0 auto;
}

h1 {
  margin: 0 0 10px;
  font-size: 28px;
}

.desc {
  margin: 0 0 16px;
  color: #444;
}

.section {
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid #ececec;
}

h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

ul {
  margin: 0 0 4px;
  padding-left: 18px;
}

.back-link {
  margin-top: 6px;
  display: inline-block;
  text-decoration: none;
  color: #0b57a4;
}

.back-link:hover {
  text-decoration: underline;
}