:root {
  --background: 240 20% 5%;
  --foreground: 240 10% 95%;
  --card: 240 15% 9%;
  --card-foreground: 240 10% 95%;
  --primary: 270 94% 70%;
  --primary-foreground: 270 55% 9%;
  --muted-foreground: 240 9% 65%;
  --border: 243 14% 22%;
  --radius: 0.75rem;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font:
    16px/2 Tahoma,
    Arial,
    sans-serif;
}
header,
footer {
  max-width: 1000px;
  margin: auto;
  padding: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid hsl(var(--border));
}
main {
  max-width: 840px;
  margin: auto;
  padding: 32px 24px 64px;
}
nav,
footer {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}
a {
  color: hsl(var(--primary));
  text-decoration: none;
}
a:focus-visible {
  outline: 2px solid hsl(var(--primary));
  outline-offset: 4px;
}
h1 {
  font-size: 30px;
  line-height: 1.7;
}
h2 {
  font-size: 20px;
  margin-top: 0;
}
section {
  padding: 24px;
  margin: 24px 0;
  background: hsl(var(--card));
  color: hsl(var(--card-foreground));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
}
p {
  color: hsl(var(--muted-foreground));
}
.cta {
  display: inline-block;
  padding: 12px 24px;
  margin-top: 24px;
  border-radius: var(--radius);
  background: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
}
li {
  margin-bottom: 24px;
}
summary {
  cursor: pointer;
}
footer {
  font-size: 14px;
  border-top: 1px solid hsl(var(--border));
  border-bottom: 0;
}
@media (max-width: 640px) {
  h1 {
    font-size: 24px;
  }
  main {
    padding: 24px 16px;
  }
  section {
    padding: 16px;
  }
}