body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f4f6f8;
  margin: 0;
  padding: 0;
  text-align: center;
}

.container {
  max-width: 600px;
  margin: 60px auto;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

h1 {
  color: #2c3e50;
  font-size: 24px;
  margin-bottom: 20px;
}

.alerta {
  background-color: #fff3cd;
  color: #856404;
  border: 1px solid #ffeeba;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 16px;
}

.botones {
  margin-bottom: 25px;
}

.boton {
  display: inline-block;
  background-color: #007bff;
  color: white;
  padding: 10px 20px;
  margin: 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.boton:hover {
  background-color: #0056b3;
}

.progreso {
  margin-top: 20px;
}

progress {
  width: 80%;
  height: 20px;
  border-radius: 8px;
  overflow: hidden;
}

#porcentaje {
  display: block;
  margin-top: 10px;
  font-size: 16px;
  font-weight: bold;
}

.mensaje {
  margin-top: 25px;
  font-size: 18px;
}

.exito {
  color: #28a745;
}

.error {
  color: #dc3545;
}