body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f7fa;
  color: #333;
}
header {
  background-color: #1a1a1a;
  color: white;
  padding: 1rem 2rem;
}
header h1 {
  margin: 0;
}
nav a {
  color: #ccc;
  margin-right: 1rem;
  text-decoration: none;
}
nav a:hover {
  color: white;
}
main {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
  background: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  margin-top: 2rem;
}
footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: #666;
}
.button {
  display: inline-block;
  background-color: #0073e6;
  color: white;
  padding: 0.7rem 1.2rem;
  margin-top: 1.5rem;
  text-decoration: none;
  border-radius: 6px;
}