:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 30px 20px;
  background: #0f172a;
  color: #e2e8f0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.7;
}

main, header, footer, nav {
  max-width: 1100px;
  margin: auto;
}

h1, h2, h3 {
  color: #5eead4;
}

a {
  color: #5eead4;
}

nav a {
  display: inline-block;
  margin-right: 20px;
}

section, article {
  margin: 24px 0;
  padding: 24px;
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 12px;
}

button {
  background: #5eead4;
  color: #0f172a;
  border: none;
  padding: 12px 18px;
  border-radius: 8px;
}

@media (max-width: 600px) {
  body {
    padding: 16px;
  }

  section, article {
    padding: 16px;
  }
}