@page {
  size: A5;
  margin: 18mm 16mm 20mm 16mm;
}

@page cover {
  size: A5;
  margin: 0;
}

html {
  font-family: "Songti SC", "Songti TC", "STSong", serif;
  font-size: 11pt;
  line-height: 1.8;
  color: #111;
}

body {
  margin: 0;
}

.cover-page {
  page: cover;
  break-after: page;
  height: 100vh;
}

.cover-page img {
  display: block;
  width: 100%;
  height: 100vh;
  object-fit: cover;
}

header#title-block-header {
  break-after: page;
  text-align: center;
  padding: 72mm 0 0;
}

header#title-block-header .title {
  font-size: 24pt;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 14mm;
}

header#title-block-header .author {
  font-size: 12pt;
  margin: 0;
}

nav#TOC {
  break-after: page;
  padding-top: 6mm;
}

nav#TOC h2 {
  font-size: 16pt;
  text-align: center;
  margin: 0 0 8mm;
  letter-spacing: 0.08em;
}

nav#TOC ul,
nav#TOC ol {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

nav#TOC li {
  margin: 0;
}

nav#TOC > ul > li {
  margin: 0 0 0.95em;
  line-height: 1em;
}

nav#TOC > ul > li > a {
  display: block;
  text-align: center;
  font-size: 14pt;
  font-weight: 600;
  letter-spacing: 0.05em;
}

nav#TOC > ul > li > ul {
  margin-top: 0.45em;
}

nav#TOC > ul > li > ul > li {
  margin: 0 0 0.4em;
  line-height: 1em;
}

nav#TOC > ul > li > ul > li > a {
  display: block;
  font-size: 9.5pt;
  font-weight: 400;
  text-align: left;
  padding-left: 2.6em;
  text-indent: -2.6em;
}

nav#TOC a {
  color: #111;
  text-decoration: none;
}

section.level1 > h1 {
  break-before: page;
  font-size: 19pt;
  font-weight: 600;
  text-align: center;
  margin: 0 0 12mm;
}

section.level2 > h2 {
  break-before: page;
  font-size: 15pt;
  font-weight: 600;
  text-align: center;
  margin: 0 0 10mm;
}

p {
  margin: 0 0 0.75em;
  text-indent: 2em;
  widows: 2;
  orphans: 2;
}

hr {
  border: 0;
  border-top: 1px solid #999;
  width: 28%;
  margin: 2em auto;
}

img {
  max-width: 100%;
}