@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-regular.woff2") format("woff2"),
  url("../fonts/jetbrains-mono-regular.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-italic.woff2") format("woff2"),
  url("../fonts/jetbrains-mono-italic.ttf") format("truetype");
  font-weight: normal;
  font-style: italic;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-bold.woff2") format("woff2"),
  url("../fonts/jetbrains-mono-bold.ttf") format("truetype");
  font-weight: bold;
  font-style: normal;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-bold-italic.woff2") format("woff2"),
  url("../fonts/jetbrains-mono-bold-italic.ttf") format("truetype");
  font-weight: bold;
  font-style: italic;
}

:root {
  --white-pure: #ffffff;
  --white: #fbfbfb;
  --light: #ececec;
  --black: #2f2f2f;
  --gray: #cccccc;
  --blue: #1565c0;
  --wine: #c01565;

  --text: var(--black);
  --line: var(--gray);
  --link: var(--blue);
  --link-visited: var(--wine);

  font-family: "JetBrains Mono", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  font-size: 15px;
  letter-spacing: 1px;
  line-height: 1.8;

  background-color: var(--white);
  color: var(--text);
}

body {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  gap: 2rem;

  margin: 0 auto;
  padding: 1rem;
  max-width: 800px;
}

header {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: stretch;
  gap: 0.5rem;

  margin: 0;
  padding: 0;
}

header > nav {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: stretch;
  gap: 0.5rem;

  margin: 0;
  padding: 0;
}

main {
  margin: 0;
  padding: 0;
}

main > article {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  gap: 0.7rem;

  margin: 0;
  padding: 0;
}

footer {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  gap: 0.5rem;

  margin: 0;
  padding: 0;
}

footer ul {
  list-style: none;

  margin: 0;
  padding: 0;
  width: 100%;
}

footer ul > li {
  display: inline;
}

h1, h2, h3, h4, h5, h6, p, li {
  margin: 0;
  padding: 0;

  text-align: start;
  word-break: break-word;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.5rem;
}

h4, h5, h6 {
  font-size: 1.25rem;
}

small {
  font-size: calc(1rem - 2px);
}

ul, ol {
  margin: 0;
  padding-left: 2rem;
}

li table, li img, li .highlight {
  margin-top: 1rem;
}

table, th, td {
  padding: 0.5rem;

  text-align: left;
  border: 1px solid var(--line);
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--white-pure);
  box-sizing: border-box;
  text-indent: initial;
}

pre {
  margin: 0;
  padding: 1rem;
  white-space: pre;
  overflow-x: auto;

  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  background-color: var(--light);
}

code {
  margin: 0;
  padding: 0 2px;

  font-family: "JetBrains Mono", monospace;
  background-color: var(--light);
  border-radius: 4px;
}

pre > code {
  padding: 0;
}

blockquote {
  margin: 0;
  padding: 1rem;

  background-color: var(--light);
  border-left: 4px solid var(--line);
  border-radius: 4px;
}

a, a:link {
  color: var(--link);
  text-decoration: none;
}

a:visited, a:focus {
  color: var(--link-visited);
  text-decoration: none;
}

a:hover, a:active {
  color: var(--link-visited);
  text-decoration: underline;
}

img {
  max-width: 100%;
  border-style: none;
}

.horizontal {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-around;
  align-items: stretch;
}