body {
  font-family: Arial, sans-serif;
  background-color: #121212;
  color: #e0e0e0;
  margin: 0;
  padding: 0;
}

header {
  background: #0c0c0c;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header img {
  height: 40px;
}

.navbar .nav-link {
  margin: 0 10px;
  color: #e0e0e0;
  text-decoration: none;
}

.navbar .nav-link:hover {
  color: #09f;
}

.Titulo {
  padding: 20px;
  text-align: center;
}

.Titulo h1 {
  font-size: 2rem;
  margin: 0;
}

.Titulo h5 {
  margin: 5px 0 0;
  font-weight: normal;
  color: #aaa;
}

.controls {
  text-align: center;
  margin: 20px 0;
}

.controls button {
  margin: 10px;
  padding: 15px 25px;
  background: #0c0c0c;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.controls button:hover {
  background: #09f;
}

/* Grid principal: 4 recuadros */
.grid-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 2 columnas */
  grid-template-rows: repeat(2, auto);   /* 2 filas */
  gap: 20px;
  padding: 20px;
}

.grid-item {
  background: #1e1e1e;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.6);
  min-height: 250px; /* altura mínima para balancear */
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.grid-item h3 {
  margin-bottom: 15px;
  color: #09f;
  font-size: 1.2rem;
  border-bottom: 1px solid #333;
  padding-bottom: 5px;
}

.grid-item p {
  margin: 5px 0;
  line-height: 1.4;
}

/* Gráfica */
#performanceChart {
  margin-top: 15px;
  max-height: 180px;
}

/* Diagnóstico */
#diagnostics {
  color: #fff;
  font-size: 0.95rem;
}

.loader, #loaderPrint, #loaderDiagnostics {
  display: none;
  font-size: 18px;
  text-align: center;
  animation: blink 1s infinite alternate;
}

@keyframes blink {
  from { opacity: 1; }
  to { opacity: 0.5; }
}

#error-message {
  display: none;
  color: red;
  font-weight: bold;
  margin-top: 10px;
}

.noir-section {
  background: #0c0c0c;
  padding: 20px;
  margin: 20px;
  border-radius: 8px;
  color: #fff;
}

/* Responsive */
@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr; /* una columna en móviles */
    grid-template-rows: auto;
  }
}