:root {
  --bg: #fff;
  --fg: #222;
  --accent: #3568a8;
  --muted: #6a6a6a;
  --border: #e5e5e5;
  --code-bg: #f5f5f5;
  --max-width: 50rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --fg: #ebebec;
    --accent: #86a5bb;
    --muted: #ababab;
    --border: #333;
    --code-bg: #202022;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  line-height: 1.6;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background: var(--bg);
  color: var(--fg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;

  &:hover {
    text-decoration: underline;
  }
}

header nav {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 1rem 1.5rem;
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);

  .site-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-right: auto;
  }

  @media (max-width: 600px) {
    .site-title {
      flex-basis: 100%;
    }
  }
}

main {
  min-height: 60vh;
  font-size: 0.95rem;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: 4px;
}

figcaption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 1rem;
  margin-bottom: 1.5rem;
}

h1, h2, h3, h4 {
  margin: 2rem 0 0.75rem;
  line-height: 1.3;
}

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.1rem; }
h4 { font-size: 1rem; }

h2::after {
  content: " ##";
  color: var(--muted);
  font-weight: normal;
}

h3::after {
  content: " ###";
  color: var(--muted);
  font-weight: normal;
}

h4::after {
  content: " ####";
  color: var(--muted);
  font-weight: normal;
}

p, ul, ol {
  margin-bottom: 1rem;
}

ul, ol {
  padding-left: 1.5rem;
}

.post-header {
  margin-bottom: 2rem;

  h1 {
    margin-bottom: 0.5rem;
  }

  time, .chapter {
    color: var(--muted);
    font-size: 0.9rem;
  }
}

.post-list {
  list-style: none;
  padding: 0;

  li {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;

    time, .chapter {
      color: var(--muted);
      font-size: 0.9rem;
    }

    .chapter {
      min-width: 6rem;
    }

    time {
      min-width: 6rem;
    }
  }
}

.recent-posts {
  margin-top: 3rem;
}

code {
  font-family: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  overflow-x: auto;
  border-radius: 4px;
  margin-bottom: 1rem;
  background: var(--code-bg) !important;

  code {
    background: none;
    padding: 0;
  }
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--muted);
}

table {
  border-collapse: collapse;
  margin: 1rem 0;
  width: 100%;
  overflow-x: auto;
  display: block;

  th, td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
    text-align: left;
  }

  th {
    background: var(--code-bg);
    font-weight: 600;
  }

  tr:hover {
    background: var(--code-bg);
  }
}

.pagination {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.not-found {
  text-align: center;
  padding: 3rem 0;

  h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
  }
}

.toc {
  background: var(--code-bg);
  border-radius: 4px;
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;

  .toc-title {
    font-size: 1rem;
    font-weight: bold;
    margin: 0 0 0.5rem;
  }

  ul {
    margin: 0;
    padding-left: 1.25rem;
    list-style: none;
  }

  > ul {
    padding-left: 0;
  }

  li {
    margin: 0.25rem 0;
  }
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;

  .footer-links {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 0.5rem;
  }
}