body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 0;
  background: #f4f6f8;
}

header {
  background: #2c3e50;
  padding: 1rem;
}

nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
  font-weight: bold;
}

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

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

form {
  display: flex;
  flex-direction: column;
  max-width: 400px;
  margin: auto;
}

form input, form button {
  padding: 0.5rem;
  margin: 0.5rem 0;
}

button {
  background: #2980b9;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #3498db;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #2c3e50;
  color: #bdc3c7;
  margin-top: 2rem;
}