html {
  line-height: 1.5;
  font-family: "Noto Serif CJK SC", serif;
  font-size: 13px;
  color: #1a1a1a;
  background-color: #f3ede6;
}

body {
  margin: 0 auto;
  max-width: 73%;
  padding-left: 20px;
  padding-right: 20px;
  padding-top: 50px;
  padding-bottom: 50px;
  hyphens: auto;
  overflow-wrap: break-word;
  text-rendering: optimizeLegibility;
  font-kerning: auto;
}

math {
  font-family: "Latin Modern Math";
  overflow-x: auto; /* 允许数学公式左右滑动 */
}

img {
  max-width: 80%;   /* 图片宽度为段落宽度的80% */
  height: auto;     /* 保持图片比例 */
  display: block;   /* 确保图片作为块元素显示 */
  margin-left: auto;
  margin-right: auto;
  text-align: center; /* 居中显示代替文本 */
}

@media (max-width: 600px) {
  body {
    font-size: 0.9em;
    padding: 1em;
  }
  h1 {
    font-size: 1.8em;
  }
}

@media print {
  body {
    background-color: transparent;
    color: black;
    font-size: 12pt;
  }
  p, h2, h3 {
    orphans: 3;
    widows: 3;
  }
  h2, h3, h4 {
    page-break-after: avoid;
  }
}

p {
  margin: 1em 0;
  text-indent: 2em;
}

a:link {
  color: blue;
}

a:visited {
  color: rgb(99, 122, 160);
}

a:hover {
  text-decoration: none;
  font-weight: bold;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 1.4em;
}

h5, h6 {
  font-size: 1em;
  font-style: italic;
}

h6 {
  font-weight: normal;
}

ol, ul {
  padding-left: 1.7em;
  margin-top: 1em;
}

li > ol, li > ul {
  margin-top: 0;
}

blockquote {
  margin: 1em 0 1em 1.7em;
  padding-left: 1em;
  border-left: 2px solid #e6e6e6;
  color: #606060;
}

code {
  font-family: Fira Code, monospace;
  font-size: 80%;
  margin: 0;
}

pre {
  margin: 1em 0;
  overflow: auto;
  font-family: Georgia, serif;
  font-size: 17px;
}

pre code {
  padding: 0;
  overflow: visible;
  overflow-wrap: normal;
}

.sourceCode {
  background-color: transparent;
  overflow: visible;
}

hr {
  background-color: #1a1a1a;
  border: none;
  height: 1.1px;
  margin: 2em 0;
}

table {
  margin: 1em 0;
  border-collapse: collapse;
  width: 100%;
  overflow-x: auto;
  display: block;
  font-variant-numeric: lining-nums tabular-nums;
}

table caption {
  margin-bottom: 0.75em;
}

tbody {
  margin-top: 0.5em;
  border-top: 1px solid #1a1a1a;
  border-bottom: 1px solid #1a1a1a;
}

th {
  border-top: 1px solid #1a1a1a;
  padding: 0.25em 0.5em 0.25em 0.5em;
}

td {
  padding: 0.125em 0.5em 0.25em 0.5em;
}

header {
  margin-bottom: 4em;
  text-align: center;
}