:root {
  color-scheme: light;
  --ink: #17201d;
  --muted: #5d6863;
  --line: #d8dedb;
  --paper: #ffffff;
  --canvas: #f3f5f4;
  --green: #176b4d;
  --green-soft: #eaf3ef;
  --orange: #b85d1f;
  --orange-soft: #fff1e7;
}

html {
  scroll-behavior: smooth;
  background: var(--canvas);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  color: var(--ink);
}

body {
  box-sizing: border-box;
  max-width: 1160px;
  margin: 0 auto;
  padding: 48px 40px 96px 320px;
  background: var(--paper);
  line-height: 1.75;
  overflow-wrap: anywhere;
}

#title-block-header {
  display: none;
}

#TOC {
  position: fixed;
  top: 24px;
  bottom: 24px;
  width: 248px;
  margin-left: -288px;
  padding: 18px 18px 24px;
  overflow-y: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8faf9;
  box-sizing: border-box;
}

#TOC::before {
  content: "研究目录";
  display: block;
  margin-bottom: 12px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
}

#TOC ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

#TOC ul ul {
  margin-top: 6px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

#TOC li {
  margin: 0 0 7px;
  font-size: 12px;
  line-height: 1.45;
}

#TOC > ul > li > a {
  display: none;
}

#TOC a {
  color: var(--muted);
  text-decoration: none;
}

#TOC a:hover,
#TOC a:focus-visible {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  color: var(--ink);
  letter-spacing: 0;
  line-height: 1.3;
  scroll-margin-top: 24px;
}

h1 {
  margin: 0 0 10px;
  padding-bottom: 20px;
  border-bottom: 3px solid var(--green);
  font-size: 34px;
}

h2 {
  margin: 64px 0 22px;
  padding-top: 4px;
  font-size: 25px;
}

h2::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 24px;
  margin-right: 10px;
  border-radius: 2px;
  background: var(--green);
  vertical-align: -3px;
}

h3 {
  margin: 36px 0 14px;
  font-size: 19px;
}

h4 {
  margin: 28px 0 10px;
  font-size: 16px;
}

p,
li {
  color: #2c3632;
}

p {
  margin: 12px 0;
}

strong {
  color: #111815;
}

blockquote {
  margin: 22px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--orange);
  background: var(--orange-soft);
  color: #4f3423;
}

blockquote p {
  margin: 0;
  color: inherit;
}

table {
  display: block;
  width: 100%;
  margin: 18px 0 28px;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 13px;
}

thead {
  background: var(--green-soft);
}

th,
td {
  min-width: 92px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #153c2e;
  font-weight: 700;
}

tbody tr:nth-child(even) {
  background: #fafbfa;
}

code {
  padding: 2px 5px;
  border-radius: 3px;
  background: #edf1ef;
  color: #1c563f;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
}

hr {
  margin: 48px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  body {
    width: 100%;
    padding: 24px 18px 64px;
  }

  #TOC {
    position: static;
    width: 100%;
    max-height: 280px;
    margin: 0 0 30px;
  }

  h1 {
    font-size: 27px;
  }

  h2 {
    margin-top: 48px;
    font-size: 22px;
  }

  th,
  td {
    min-width: 120px;
  }
}

@media print {
  html,
  body {
    background: #fff;
  }

  body {
    max-width: none;
    padding: 0;
    font-size: 11pt;
  }

  #TOC {
    display: none;
  }

  h2,
  h3,
  h4 {
    break-after: avoid;
  }

  table,
  blockquote {
    break-inside: avoid;
  }
}