:root {
  color-scheme: light;
  --background: #f7f8fa;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #59636e;
  --border: #d8dee4;
  --link: #0969da;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

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

.site-header,
.site-footer,
.content {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0 18px;
}

.site-title {
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
}

.content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 34px 40px;
}

.site-footer {
  padding: 18px 0 32px;
  color: var(--muted);
  font-size: 14px;
}

h1,
h2,
h3 {
  line-height: 1.35;
}

h1 {
  margin-top: 0;
  font-size: 30px;
}

h2 {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 22px;
}

h3 {
  margin-top: 26px;
  font-size: 18px;
}

ul {
  padding-left: 1.4em;
}

@media (max-width: 640px) {
  .content {
    padding: 24px 20px;
  }

  h1 {
    font-size: 25px;
  }
}