* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fafafa;
}

header {
  background: #1a1a2e;
  color: #fff;
  padding: 2rem 1.5rem;
  text-align: center;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

nav a {
  color: #eee;
  text-decoration: none;
  margin: 0 0.75rem;
  font-weight: 600;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 700px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

section {
  margin-bottom: 2.5rem;
}

section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid #1a1a2e;
  display: inline-block;
  padding-bottom: 0.25rem;
}

article {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 1.25rem;
  margin-top: 1rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: #777;
  font-size: 0.9rem;
}