body {
  font-family: system-ui, sans-serif;
  max-width: 420px;
  margin: 4rem auto;
  padding: 0 1rem;
  color: #1a1a1a;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

label {
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 0.75rem;
}

input {
  padding: 0.5rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  margin-top: 1.5rem;
  padding: 0.6rem;
  font-size: 1rem;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:disabled {
  background: #93b4f0;
  cursor: not-allowed;
}

#feedback {
  margin-top: 1rem;
  font-size: 0.9rem;
}

#feedback.success {
  color: #16803c;
}

#feedback.error {
  color: #b91c1c;
}