@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .main-navigation {
    display: none;
    width: 100%;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    padding: 20px;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    z-index: 1001;
  }
  
  .main-navigation.active {
    display: block;
  }
  
  .main-navigation ul {
    flex-direction: column;
    padding: 0;
    margin: 0;
    list-style: none;
  }
  
  .main-navigation li {
    margin: 0 0 15px 0;
    text-align: center;
  }
  
  .main-navigation a {
    display: block;
    padding: 10px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid var(--light-gray);
  }
  
  .main-navigation a:hover {
    color: var(--secondary-color);
  }
  
  .site-header {
    position: relative;
  }
  
  body.menu-open {
    overflow: hidden;
  }
  
  .menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
  }
  
  .menu-overlay.active {
    display: block;
  }
}