body {
  font-family: "Segoe UI", sans-serif;
  background: #f7f9fb;
  color: #222;
  margin: 0;
  padding: 2rem;
}
.container {
  max-width: 800px;
  margin: auto;
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 0 12px rgba(0,0,0,0.05);
}
fieldset {
  margin-bottom: 20px;
  border: 1px solid #ccc;
  padding: 1rem;
  border-radius: 6px;
}
input, button {
  padding: 10px;
  margin: 5px 0;
  width: 100%;
}
#guide {
  margin-top: 2rem;
  background: #eef2f7;
  padding: 1rem;
  border-radius: 8px;
}