:root {
  color-scheme: light dark;

  --paper: #fff;
  --ink: #000;
  --muted: #555;
  --rule: #ccc;
  --link: #00e;
  --visited: #551a8b;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --measure: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #000;
    --ink: #fff;
    --muted: #aaa;
    --rule: #444;
    --link: #8ab4f8;
    --visited: #c58af9;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

a {
  color: var(--link);

  &:visited {
    color: var(--visited);
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.site-header,
.site-footer,
main {
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 1rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.5rem 0.75rem;
  border-bottom: 1px solid var(--ink);

  nav {
    display: flex;
    gap: 1rem;
  }
}

.site-title {
  font-family: var(--mono);
  font-weight: bold;
  color: var(--ink);
  text-decoration: none;

  &:visited {
    color: var(--ink);
  }
}

main {
  padding-block: 2rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1rem 2rem;
  border-top: 1px solid var(--ink);
  font-size: 0.875rem;

  p {
    margin: 0;
  }

  .social-links {
    display: flex;
    gap: 1rem;
    margin: 0;
    padding: 0;
    list-style: none;
  }
}

.page-header {
  margin-bottom: 1.5rem;

  h1 {
    margin: 0 0 0.25rem;
    font-size: 2rem;
    line-height: 1.2;
  }
}

.post-meta,
.post-series {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* inline-block keeps the link's underline off the dot */
.topic-link::before {
  content: "·";
  display: inline-block;
  margin-inline: 0.4em;
  color: var(--muted);
}

.lede {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.page-header .lede {
  margin: 0;
}

.prose {
  overflow-wrap: break-word;

  h1,
  h2,
  h3,
  h4 {
    margin: 2rem 0 0.5rem;
    line-height: 1.25;
  }

  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  h3 {
    font-size: 1.15rem;
  }

  h4 {
    font-size: 1rem;
  }

  p,
  ul,
  ol,
  blockquote,
  pre,
  table {
    margin-block: 0 1rem;
  }

  img,
  video {
    display: block;
    max-width: 100%;
    height: auto;
    margin-inline: auto;
  }

  iframe {
    display: block;
    max-width: 100%;
    margin: 0 auto 1rem;
  }

  blockquote {
    margin-inline: 0;
    padding-left: 1rem;
    border-left: 3px solid var(--rule);
  }

  hr {
    margin-block: 2rem;
    border: 0;
    border-top: 1px solid var(--rule);
  }

  del {
    text-decoration-thickness: 0.1em;
  }

  a[target="_blank"]::after {
    content: "↗";
    display: inline-block;
    margin-left: 0.1em;
    font-size: 0.75em;
    vertical-align: 0.15em;
    text-decoration: none;
  }

  code {
    font-family: var(--mono);
    font-size: 0.875em;
  }

  pre {
    padding: 0.75rem 1rem;
    overflow-x: auto;
    border: 1px solid var(--rule);
    line-height: 1.45;
  }

  table {
    display: block;
    overflow-x: auto;
    border-collapse: collapse;
  }

  th,
  td {
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--rule);
    vertical-align: top;
  }

  .footnotes {
    margin-top: 2rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--rule);
    font-size: 0.9rem;
  }
}

/* Shiki writes its colors as inline styles, which only !important overrides. */
.prose pre.shiki {
  background-color: var(--paper) !important;
}

@media (prefers-color-scheme: dark) {
  .shiki span {
    color: var(--shiki-dark) !important;
  }
}

.entries {
  padding-left: 0;

  .entries {
    margin-top: 0.5rem;
    padding-left: 1.5rem;
  }
}

.entry,
.aside {
  list-style: none;
  margin-bottom: 0.75rem;
}

.aside {
  font-style: italic;
  color: var(--muted);
}

.entry-head a {
  font-size: 1.125rem;
  font-weight: 600;
}

.entry-date {
  margin-left: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.entry-description {
  font-size: 0.95rem;
  color: var(--muted);
}

.series-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);

  [rel="next"] {
    margin-left: auto;
    text-align: right;
  }
}