#sidebar {
  background: linear-gradient(180deg, #2f2f2f, #3d3d3d);
  box-shadow: 3px 0 8px rgba(0,0,0,0.3);
}

#sidebar .nav-link {
  border-radius: 8px;
  padding: 10px 12px;
  font-weight: 500;
  transition: background .3s;
}

#sidebar .nav-link:hover {
  background-color: #4d4d4d;
  color: #e0e0e0 !important;
}

#sidebar .nav-link i {
  color: #bfbfbf;
}

#sidebar .nav-link.active {
  background-color: #6c6c6c;
  color: #fff;
}