body {
  margin: 0;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background-color: #f9fafb;
  color: #333;
  line-height: 1.7;
  font-size: 1.2rem;
}

header {
  background: linear-gradient(135deg, #6d83f2, #9bafd9);
  color: white;
  text-align: center;
  padding: 4rem 2rem;
}
header h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
main, footer {
  max-width: 900px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}
main p {
  margin-bottom: 1.5rem;
}
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding: 1rem;
  font-size: 0.9rem;
}
footer .copyright,
footer .link {
  margin: 0.3rem 0;
}
@media (max-width: 600px) {
  footer {
    flex-direction: column;
    text-align: center;
  }
}
nav {
  margin-top: 1rem;
}
nav a {
  color: white;
  text-decoration: none;
  margin: 0 0.5rem;
  font-weight: 500;
}
nav a:hover {
  text-decoration: underline;
}

nav a.active {
  text-decoration: underline;
  font-weight: bold;
}