/* Custom styles không thuộc Tailwind utilities */

html, body {
  height: 100%;
  margin: 0;
}

#chart-container {
  width: 100%;
  height: 500px;
  min-height: 400px;
}

@media (max-width: 768px) {
  #chart-container {
    height: 350px;
  }
}

/* Loading overlay */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  flex-direction: column;
  gap: 1rem;
  color: white;
}

#loading-overlay.hidden {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.2);
  border-top-color: #3b82f6;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Animation cho alerts mới xuất hiện */
.alert-item {
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}