body {
  font-family: Arial, sans-serif;
  margin: 0;
}
header {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
main {
  margin-left: 220px;
  padding: 20px;
}
}
.nav-menu {
  padding: 2rem 0;
}
.nav-item {
  display: flex;
  align-items: center;
  padding: 1rem 2rem;
  color: #374151;
  text-decoration: none;
  transition: all 0.3s ease;
  border-left: 4px solid transparent;
}
.nav-item:hover,
.nav-item.active {
  background: linear-gradient(
    90deg,
    rgba(102, 126, 234, 0.1) 0%,
    transparent 100%
  );
  border-left-color: #667eea;
  color: #667eea;
}
.nav-item i {
  width: 20px;
  margin-right: 1rem;
}
.logout {
  position: absolute;
  bottom: 2rem;
  left: 2rem;
  right: 2rem;
  padding: 1rem;
  background: #dc2626;
  color: white;
  text-align: center;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: all 0.3s ease;
}
.logout:hover {
  background: #b91c1c;
  transform: translateY(-2px);
}