body {
  font-family: Arial;
  background: #0b0f1a;
  color: white;
  text-align: center;
  margin: 0;
}

button {
  padding: 10px 20px;
  margin: 10px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
}

.funciones-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  max-width: 360px;
  margin: 24px auto;
}

.funcion-card {
  padding: 18px 20px;
  font-size: 22px;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  background: rgba(255,255,255,0.08);
  color: white;
  text-align: left;
}

.funcion-card:hover {
  background: rgba(255,255,255,0.14);
}
.app-header {
  text-align: center;
  padding: 20px;
}

.app-header img {
  max-width: 220px;
  width: 80%;
  height: auto;
}
.app-header {
  background: transparent;
}
.demo-text {
  font-size: 14px;
  opacity: 0.7;
  margin-top: 5px;
}