.header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 10px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.header img {
    margin-left: -40px;
    cursor: pointer;
}

.menu-icon {
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    margin-right: 60px;
}

.menu-icon span {
    display: block;
    height: 4px;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.menu-icon.open span:nth-child(1) {
    transform: rotate(45deg) translateY(18px);
}

.menu-icon.open span:nth-child(2) {
    opacity: 0;
}

.menu-icon.open span:nth-child(3) {
    transform: rotate(-45deg) translateY(-18px);
}