body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f7f8fa;
  color: #222;
  margin: 0;
  padding: 0;
}
header, footer {
  background: #1a2332;
  color: #fff;
  padding: 24px 0 16px 0;
  text-align: center;
}
header nav a, footer a {
  color: #fff;
  text-decoration: none;
  margin: 0 10px;
  font-weight: 500;
}
header nav a:hover {
  text-decoration: underline;
}
main {
  max-width: 800px;
  margin: 32px auto;
  background: #fff;
  padding: 32px 24px;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
h1, h2, h3 {
  color: #1a2332;
  margin-top: 0;
}
ul, p {
  line-height: 1.7;
}
form input, form textarea, form button {
  width: 100%;
  margin-bottom: 16px;
  padding: 10px;
  border: 1px solid #cfd8dc;
  border-radius: 4px;
  font-size: 1rem;
}
form button {
  background: #1a2332;
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s;
}
form button:hover {
  background: #2d3a4d;
}
@media (max-width: 600px) {
  main {
    padding: 16px 4px;
  }
  header, footer {
    padding: 16px 0 8px 0;
  }
}