/* Reset básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  color: #333;
  line-height: 1.5;
  padding: 20px;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  font-size: 2em;
}

form {
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  max-width: 700px;
  margin: 0 auto;
}

label {
  font-weight: bold;
}

input[type="email"] {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  margin-bottom: 15px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

.option {
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.option:hover {
  background: #f0f8ff;
  border-color: #4caf50;
}

.option input {
  margin-right: 10px;
}

button {
  width: 100%;
  padding: 15px;
  background: #4caf50;
  border: none;
  color: white;
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #45a049;
}

.msg {
  margin-top: 20px;
  padding: 15px;
  border-radius: 8px;
  background: #e6ffe6;
  text-align: center;
  font-weight: bold;
}

.error {
  background: #ffe6e6;
  color: #900;
}

/* Responsive */
@media (max-width: 768px) {
  body { padding: 15px; }
  h1 { font-size: 1.8em; }
  form { padding: 15px; }
  .option { padding: 10px; }
  button { padding: 12px; font-size: 15px; }
}

@media (max-width: 480px) {
  body { padding: 10px; }
  h1 { font-size: 1.5em; }
  form { padding: 12px; }
  .option { padding: 8px; font-size: 14px; }
  button { padding: 10px; font-size: 14px; }
}