.book.font-family-1 { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
.page-inner { max-width: 820px; }
.markdown-section { line-height: 1.95; }
.markdown-section p { margin-bottom: 1.25em; }
.markdown-section img { height: auto; max-width: 100%; }
.markdown-section table { display: block; overflow-x: auto; }
@media (max-width: 600px) {
  .page-inner { padding: 20px 22px 50px; }
  .markdown-section { font-size: 17px; line-height: 2; }
  .markdown-section h1 { font-size: 1.65em; }
}