body {
  max-width: 800px;
  margin: auto;
  padding: 1em;
  line-height: 1.5;
}

/* remove link underline */
a {
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* header and footer areas */
.menu { padding: 0; }
.menu li { display: inline-block; }
.article-meta, .menu a {
  text-decoration: none;
  background: #eee;
  padding: 5px;
  border-radius: 5px;
}
.menu, .article-meta, footer { text-align: center; }
footer a { text-decoration: none; }

.meta-line {
  margin-top: 0.5em;
  font-size: 0.9em;
  color: #666;
}
.meta-line span {
  margin-right: 1em;
  white-space: nowrap;
}
.meta-line a {
  text-decoration: none;
}

hr {
  border-style: dashed;
  color: #ddd;
}
/* code */
pre {
  border: 1px solid #ddd;
  box-shadow: 5px 5px 5px #eee;
  padding: 1em;
  overflow-x: auto;
}
code { background: #f9f9f9; }
pre code { background: none; }

/* misc elements */
img, iframe, video { max-width: 100%; }
main { hyphens: auto; }
blockquote {
  background: #f9f9f9;
  border-left: 5px solid #ccc;
  padding: 3px 1em 3px;
}

table {
  margin: auto;
  border-top: 1px solid #666;
  border-bottom: 1px solid #666;
}
table thead th { border-bottom: 1px solid #ddd; }
th, td { padding: 5px; }
thead, tfoot, tr:nth-child(even) { background: #eee; }

/* TOC */
.toc {
  margin: 1em 0;
  padding: 0.5em 1em;
  background: #f9f9f9;
  border: 1px dashed #ddd;
  font-size: 0.9em;
}

.toc summary {
  cursor: pointer;
  font-weight: bold;
}

.toc ul {
  padding-left: 1.2em;
}

.toc a {
  text-decoration: none;
}

/* figure */
figure.figure {
  margin: 1.5em auto;
  text-align: center;
  max-width: 600px;
}

figure.figure img {
  max-width: 100%;
  height: auto;
}

figure.figure figcaption {
  margin-top: 0.5em;
  font-size: 0.9em;
  color: #666;
}

.figure-row {
  display: flex;
  gap: 1em;
  margin: 1.5em 0;
}

.figure-row .figure {
  flex: 1;
  margin: 0;
  text-align: center;
}

.figure-row img {
  max-width: 100%;
  height: auto;
}

@media (max-width: 600px) {
  .figure-row {
    flex-direction: column;
  }
}

/* text masking */
.mask {
  background: var(--mask-bg);
  color: transparent;
  border-radius: .25em;
  cursor: pointer;
  transition: color .2s, background .2s;
}

.mask:hover,
.mask:active {
  color: var(--mask-text);
}

:root {
  --mask-bg: #555;
  --mask-text: #fff;
}

/* pinned post */
.pin {
  font-size: 0.8em;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  body {
    background: #1e1e1e;
    color: #eaeaea;
  }

  a {
    color: #8ab4f8;
  }

  .article-meta,
  .menu a {
    background: #2a2a2a;
  }

  .meta-line {
    color: #aaa;
  }

  hr {
    color: #444;
  }

  pre {
    border-color: #444;
    box-shadow: none;
    background: #0D1117;
  }

  .toc {
    background: #2a2a2a;
    border-color: #444;
  }

  code {
    background: #1a1a1a;
  }

  blockquote {
    background: #2a2a2a;
    border-left-color: #555;
  }

  table {
    border-top-color: #555;
    border-bottom-color: #555;
  }

  table thead th {
    border-bottom-color: #444;
  }

  thead,
  tfoot,
  tr:nth-child(even) {
    background: #2a2a2a;
  }

  figure.figure figcaption {
    color: #aaa;
  }
}