@media (max-width: 768px) {
    header {
      padding: 1rem;
      flex-wrap: wrap;
    }
    
    .logo {
      margin-right: 0;
      width: 50%;
    }
    
    .currency-selector {
      margin-left: 0;
      margin-right: 0.5rem;
      order: 2;
      width: auto;
    }
    
    .hamburger {
      display: block;
      order: 3;
    }
    
    nav {
      order: 4;
      width: 100%;
    }

    nav ul {
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      background: var(--primary-color);
      flex-direction: column;
      text-align: center;
      transform: translateY(-200%);
      transition: var(--transition);
      z-index: 999;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }
  
    nav ul.active {
      display: flex;
    }
  
    nav ul li {
      margin: 0;
      text-align: center;
    }
  
    .dropdown {
      position: static;
      background: #0056b3;
    }
  
    .hero h1 {
      font-size: 1.8rem;
    }
  
    .hero p {
      font-size: 1rem;
    }
  
    .calculators {
      grid-template-columns: 1fr;
    }
  }