@media (max-width: 768px) {
  .main-navigation {
    display: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }
  .main-navigation.active {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
    background: linear-gradient(135deg, #000 0%, #1a1a1a 100%);
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    z-index: 99999;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
    padding: 20px;
  }
  .main-navigation .nav-menu {
    flex-direction: column;
    gap: 10px;
  }
  .main-navigation .nav-menu a {
    display: block;
    color: #fff;
    text-align: center;
    padding: 10px;
    background: rgba(255,255,255,0.05);
    border-radius: 5px;
  }
}