body {
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
  color: #333;
  line-height: 1.6;
}

header, footer {
  background: white;
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

main {
  max-width: 800px;
  margin: 20px auto;
  padding: 0 15px;
}

section {
  background: white;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

button {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 20px;
  font-size: 1rem;
  background: #0077ff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #005ad1;
}