body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #111;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.contenedor {
  background: #1e1e1e;
  padding: 20px;
  border-radius: 12px;
  width: 95%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 0 12px #000;
}
.logo {
  width: 140px;
  margin-bottom: 15px;
}
input[type="email"] {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  margin-bottom: 10px;
  font-size: 16px;
}
button {
  background: #e50914;
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  width: 100%;
}
button:hover {
  background: #f6121d;
}
.spinner {
  margin: 20px auto;
  width: 30px;
  height: 30px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid #fff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}