/* Reset & base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 1rem;
}

/* Form container */
form {
  background-color: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

h2 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
  color: #222;
  text-align: center;
}

/* Input field */
.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

input {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border-radius: 6px;
  border: 1px solid #ccc;
}

.optional {
  font-weight: normal;
  font-size: 0.85rem;
  color: #666;
}

/* Button */
button {
  width: 100%;
  background-color: #0070f3;
  color: white;
  padding: 0.75rem;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease-in-out;}

button:hover {
  background-color: #0059c1;
}

/* Response message */
#response {
  margin-top: 1rem;
  font-size: 0.95rem;
  text-align: center;
  color: #444;
  min-height: 1.25rem;
  transition: opacity 0.3s ease;
}

#spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(0, 112, 243, 0.2);
  border-top: 2px solid #0070f3;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 0.5rem;
  vertical-align: middle;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}