:root {
  --sans-font:
    -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir, "Nimbus Sans L", Roboto,
    "Noto Sans", "Segoe UI", Arial, Helvetica, "Helvetica Neue", sans-serif;
  --bg: #fff;
  --accent-bg: #f5f7ff;
  --text: #212121;
  --text-light: #585858;
  --border-color: #898ea4;
  --accent: #0d47a1;
  --accent-hover: #1266e2;
  --standard-border-radius: 5px;
  --border-width: 1px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #212121;
    --accent-bg: #2b2b2b;
    --text: #dcdcdc;
    --text-light: #ababab;
    --border-color: #898ea4;
    --accent: #ffb300;
    --accent-hover: #ffe099;
  }
}

html {
  font-family: var(--sans-font);
  scroll-behavior: smooth;
}

body {
  color: var(--text);
  background-color: var(--bg);
  font-size: 1.15rem;
  line-height: 1.5;
  display: grid;
  grid-template-columns: 1fr min(45rem, 90%) 1fr;
  margin: 0;
}

body > * {
  grid-column: 2;
}

body > header {
  background-color: var(--accent-bg);
  text-align: center;
  padding: 2rem 0.5rem;
  grid-column: 1 / -1;
}

body > header h1 {
  max-width: 1200px;
  margin: 1rem auto;
}

body > header p,
body > header ul {
  max-width: 72rem;
  margin: 1rem auto;
  text-align: left;
}

body > nav a,
body > footer a {
  text-decoration: none;
}

main {
  padding-top: 1.5rem;
  grid-column: 1 / -1;
  padding-inline: 1em;
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.6rem;
  margin-top: 3rem;
  text-align: center;
}

h3 {
  font-size: 2rem;
  margin-top: 3rem;
  text-align: center;
}

h4 {
  font-size: 1.5rem;
  margin-top: 2rem;
  text-align: center;
}

h1,
h2,
h3,
h4 {
  line-height: 1.1;
}

p,
h1,
h2,
h3,
h4 {
  overflow-wrap: break-word;
}

@media only screen and (max-width: 720px) {
  h1 {
    font-size: 2.5rem;
  }
  h2 {
    font-size: 2.1rem;
  }
  h3 {
    font-size: 1.75rem;
  }
  h4 {
    font-size: 1.35rem;
  }
}

a,
a:visited {
  color: var(--accent);
}

a:hover {
  text-decoration: none;
}

code,
kbd,
samp {
  font-family: Consolas, Menlo, Monaco, monospace;
  color: var(--accent);
  background: var(--accent-bg);
  border-radius: var(--standard-border-radius);
  padding: 0.1rem 0.4rem;
  white-space: nowrap;
}

kbd {
  color: var(--text);
  border: var(--border-width) solid var(--border-color);
}

pre {
  padding: 1rem 1.4rem;
  max-width: 100%;
  overflow: auto;
  background: var(--accent-bg);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--standard-border-radius);
}

pre code {
  color: var(--text);
  background: none;
  padding: 0;
}

section {
  border-top: var(--border-width) solid var(--border-color);
  border-bottom: var(--border-width) solid var(--border-color);
  padding: 2rem 0;
  margin: 3rem 0;
}

section > h2,
section > h3,
section > h4,
section > p,
section > ul,
section > ol,
section > pre,
section > table {
  max-width: 72rem;
  margin-inline: auto;
}
main > nav {
  max-width: 72rem;
  margin-inline: auto;
}

section + section,
section:first-child {
  border-top: 0;
  padding-top: 0;
}

section + section {
  margin-top: 0;
}

section:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

ol.roadmap {
  list-style: none;
  padding: 0;
  counter-reset: roadmap;
}

ol.roadmap li {
  counter-increment: roadmap;
  padding: 0.75rem 1rem 0.75rem 3rem;
  margin-bottom: 0.75rem;
  background: var(--accent-bg);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--standard-border-radius);
  position: relative;
}

ol.roadmap li::before {
  content: counter(roadmap);
  position: absolute;
  left: 0.75rem;
  font-weight: bold;
  color: var(--accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem auto;
}

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

th {
  font-weight: bold;
  background: var(--accent-bg);
}

tutuca-playground,
html-playground {
  margin: 2em 0;
}

body > nav {
  grid-column: 1 / -1;
  padding: 1rem 1rem;
  color: var(--text-light);
  font-size: 0.9rem;
  text-align: center;
  display: flex;
  justify-content: flex-end;
  gap: 2em;
  flex-wrap: wrap;
}

body > nav p {
  margin: 0;
}

body > footer {
  grid-column: 1 / -1;
  margin-top: 4rem;
  padding: 2rem 1rem 1.5rem 1rem;
  color: var(--text-light);
  font-size: 0.9rem;
  text-align: center;
  border-top: var(--border-width) solid var(--border-color);
  display: flex;
  justify-content: center;
  gap: 2em;
  flex-wrap: wrap;
}

@media only screen and (max-width: 720px) {
  body > nav,
  body > footer {
    justify-content: center;
    gap: 1em;
  }
}