body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: #f9fafb;
  color: #1f2937;
  max-width: 960px;
  margin: auto;
  padding: 24px;
  line-height: 1.6;
}

main {
  margin: 0 auto;
  padding: 2rem 1rem;
  max-width: 800px;
}

main p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

strong {
  font-weight: 600;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

section {
     background: white;
     padding: 24px;
     margin-bottom: 24px;
     border-radius: 10px;
     box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    color: #0033a0;
    font-weight: 600;
}

section h2 {
    margin-top: 0;
}

p {
    max-width: 75ch;
    margin-left: auto;
    margin-right: auto;
}

nav {
  text-align: center;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid #e5e7eb;
}

nav a {
  margin: 0 12px;
  font-weight: 500;
  text-decoration: none;
  color: #0366db;
  transition: color 0.15s ease;
}

nav a:hover {
  text-decoration: underline;
  color: #0033a0;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

footer {
  margin-top: 40px;
  font-size: 0.9em;
  color: #555;
  text-align: center;
}

footer p {
  margin: 0 auto;
  padding-top: 20px;
}

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

  h1 {
    font-size: 2rem;
  }
}