/* 自定义样式 */
body {
  font-family: "Noto Serif SC", "SimSun", serif;
  line-height: 1.8;
}
h1, h2, h3, h4 {
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: #2c3e50;
}
h1 {
  border-bottom: 2px solid #3498db;
  padding-bottom: 0.3em;
}
h2 {
  border-bottom: 1px solid #bdc3c7;
  padding-bottom: 0.2em;
  margin-top: 2em;
}
table {
  font-size: 0.9em;
}
thead {
  background-color: #ecf0f1;
}
.figure {
  text-align: center;
  margin: 2em 0;
}