body {
  font-family: system-ui, Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f6f6f6;
}
header {
  background: #1f2937;
  color: white;
  padding: 1rem;
  text-align: center;
}
main {
  padding: 1rem;
}
section {
  background: white;
  padding: 1rem;
  border-radius: 8px;
}
label {
  display: block;
  margin-bottom: 1rem;
}
input {
  width: 100%;
  padding: 0.5rem;
}
button {
  padding: 0.7rem;
  width: 100%;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 6px;
}
footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
}