body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}

.screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.hidden {
  display: none;
}

.logo {
  max-width: 150px;
  margin-bottom: 20px;
}

input, button {
  margin: 10px;
  padding: 10px;
  font-size: 1rem;
}

button {
  background: #0077b6;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: #005f8c;
}

.error {
  color: red;
}

.graficos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  width: 90%;
  margin-top: 20px;
}

/* pequeño estilo para mensajes de confirmación (si decides usarlo) */
.message-success {
  background: #e6ffef;
  color: #056a3b;
  border: 1px solid #b6f0d1;
  padding: 8px 12px;
  border-radius: 6px;
  margin-top: 10px;
}