/* The whole of the site's presentation. One file, no import, no font fetched from anywhere, and no
   script — roadmap task T90, D9. A documentation site that phoned a third party would be asking its
   readers to accept something they never chose. */

:root {
  color-scheme: light dark;
  --ink: #16181d;
  --ink-soft: #4a5160;
  --paper: #fdfdfc;
  --paper-soft: #f2f2ef;
  --rule: #dcdcd6;
  --link: #0b5cad;
  --accent: #0b5cad;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6e6e3;
    --ink-soft: #9aa1ae;
    --paper: #16181d;
    --paper-soft: #1e2128;
    --rule: #333842;
    --link: #7cb7f0;
    --accent: #7cb7f0;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

a {
  color: var(--link);
}

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--rule);
}

header .home {
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
}

header .version {
  color: var(--ink-soft);
  font-weight: 400;
  font-size: 0.85rem;
}

.languages a {
  margin-left: 1rem;
  font-size: 0.9rem;
}

.languages a[aria-current] {
  color: var(--ink-soft);
  text-decoration: none;
}

.page {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.contents {
  flex: 0 0 14rem;
  position: sticky;
  top: 2rem;
  font-size: 0.92rem;
}

.contents ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contents li {
  margin: 0.35rem 0;
}

.contents a {
  text-decoration: none;
}

.contents a:hover {
  text-decoration: underline;
}

.contents a[aria-current] {
  color: var(--ink);
  font-weight: 600;
}

main {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 46rem;
}

main h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  margin: 0 0 1.25rem;
}

main h2 {
  font-size: 1.35rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--rule);
}

main h3 {
  font-size: 1.1rem;
  margin: 1.75rem 0 0.5rem;
}

main h4 {
  font-size: 1rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--ink-soft);
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--paper-soft);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

blockquote {
  margin: 1.25rem 0;
  padding: 0.1rem 1rem;
  border-left: 3px solid var(--rule);
  color: var(--ink-soft);
}

table {
  border-collapse: collapse;
  width: 100%;
  display: block;
  overflow-x: auto;
  font-size: 0.94rem;
}

th,
td {
  border: 1px solid var(--rule);
  padding: 0.4rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--paper-soft);
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 3rem 0 1rem;
}

.source {
  font-size: 0.85rem;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

footer {
  border-top: 1px solid var(--rule);
  padding: 1.25rem 1.5rem 2.5rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

footer p {
  max-width: 68rem;
  margin: 0 auto;
}

.chooser {
  max-width: 40rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.chooser h1 {
  font-size: 2.1rem;
  margin: 0 0 1rem;
}

.chooser ul {
  list-style: none;
  padding: 0;
}

.chooser li {
  margin: 1rem 0;
}

.chooser li a {
  font-size: 1.15rem;
  font-weight: 600;
}

@media (max-width: 60rem) {
  .page {
    display: block;
    padding-top: 1.25rem;
  }

  .contents {
    position: static;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--rule);
  }

  .contents ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 1rem;
  }
}