/* Spinner for loading states */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.heatmap-cell {
  width: 28px;
  height: 22px;
  text-align: center;
  vertical-align: middle;
  font-size: 10px;
  border-radius: 2px;
}

/* Sidebar nav links */
.nav-link {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  color: #9ca3af;
  transition: background-color 0.15s;
}
.nav-link:hover {
  background-color: rgba(255,255,255,0.05);
  color: #e5e7eb;
}
.nav-link.active {
  background-color: rgba(59,130,246,0.15);
  color: #60a5fa;
}