* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: #f5f6f8;
  color: #333;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #fff;
  border-bottom: 1px solid #eee;
}
.back {
  color: #2f7bff;
  text-decoration: none;
  font-size: 15px;
}
.title {
  flex: 1;
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  margin-right: 48px;
}
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  background: #fff;
}
h2 {
  font-size: 15px;
  margin: 18px 0 8px;
}
p, li { font-size: 13px; color: #555; }
ul { padding-left: 18px; margin: 6px 0; }
.meta { font-size: 12px; color: #999; margin-bottom: 12px; }