header {
        background-color: white;
        box-shadow: var(--shadow);
        position: fixed;
        width: 100%;
        top: 0;
        z-index: 1000;
      }

      .header-container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 0;
      }

      header img {
        max-width: 150px;
      }

      nav ul {
        justify-content: space-around;
        gap: 20px;
        display: flex;
        list-style: none;
      }

      nav ul li {
        margin-left: 30px;
      }

      nav ul li a {
        text-decoration: none;
        color: black;
        font-weight: 600;
        font-size: 1rem;
        transition: var(--transition);
        position: relative;
      }

      nav ul li a::after {
        content: "";
        position: absolute;
        left: 50%;
        bottom: -2px;
        width: 0;
        height: 2px;
        background-color: var(--primary-color);
        transform: translateX(-50%);
        transition: 0.4s;
      }

      nav ul li a:hover::after {
        width: 100%;
      }

      .mobile-menu-btn {
        display: none;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--primary-color);
        cursor: pointer;
      }