.wrapper {
  width: 100%;
  max-width: 1340px;
  margin: 0 auto;
  padding: 0 40px;
}
body {
  color: #333;
  font-size: 0.875rem;
  
  min-height: 100vh;
  position: relative;
}
  
#header {
  width: 100%;
  height: 80px;
  background-color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between; 
  position: fixed;
  left: 0;
  right: 0;
  z-index: 10;
}

.site-title {
display: block;
font-size: 20px;
font-weight: bold;
}

nav {
  position: fixed;
  top: 0;
  left: -300px;
  right: 300px;
  color: #fff;
  padding: 40px 50px;
  transition: all .5s;
  z-index: 20;
  opacity: 0;
}
.nav-list a {
  color: #fff;
}
.nav-list li{
  margin-bottom: 15px;
}

.open #nav {
  left: 0;
  opacity: 1;
}
.toggle_btn {
  width: 30px;
  height: 30px;
  position: relative;
  transition: all 0.5s;
  cursor: pointer;
  z-index: 20;
}  

.toggle_btn span {
  display: block;
  position: absolute;
  width: 30px;
  height: 2px;
  background-color: black;
  border-radius: 3px;
  transition: all 0.5s;
}
.toggle_btn span:nth-child(1) {
  top: 10px;
}
.toggle_btn span:nth-child(2) {
  bottom: 10px;
}
.open .toggle_btn span {
  background-color: #fff;
}
.open .toggle_btn span:nth-child(1) {
  -webkit-transform: translateY(4px) rotate(-45deg);
  transform: translateY(4px) rotate(-45deg);
}
.open .toggle_btn span:nth-child(2) {
  -webkit-transform: translateY(-4px) rotate(45deg);
  transform: translateY(-4px) rotate(45deg);
}
#mask {
  display: none;
  transition: all 0.5s;
}
.open #mask {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgb(94, 88, 88);
  opacity: 8;
  z-index: 10;
  cursor: pointer;
}

img {
  max-width: 100%;
}

#item {
  padding-top: 80px;
  padding-bottom: 150px;

}
.item-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.item-list li {
  width: 23%;
  margin-bottom: 40px;
}
.item-list img {
  margin-bottom: 8px;
  vertical-align: top;
}
.item-list p {
  font-size: 4px;
}

.more {
  display: block;
  text-align: center;
}

#footer {
  display: flex;
  justify-content: space-between;
  position: absolute;
  left: 0;
  right: 0;
  padding-bottom: 20px;

}

#footer ul{
  display: flex;
}
#footer a {
  font-size: 12px;
  padding-right: 30px;
}
.copyright p{
  font-size: 12px;
}

.content {
  padding-top: 120px;
  padding-bottom: 160px;
}

.page-title {
  font-size: 15px;
  margin-bottom: 25px;
}

.paging {
  display: flex;
  justify-content: center;
}
.paging li {
  padding: 0 20px;
}

#about {
  max-width: 600px;
}

#about p {
  font-size: 14px;
  line-height: 2;
  margin-bottom: 32px;

}

#design  {
  width: 800px;
  display: flex;
  justify-content: space-between;
  margin-bottom: 60px;
}

.design-img {
  width: 400px;
}


.design-text {
  width: 320px;
}
.design-text p {
  line-height: 1.5;
  text-align: justify;
  margin-bottom: 32px;
}
.design-text dl {
  display: flex;
  flex-wrap: wrap;
}

.design-text dt {
  width: 30%;
  font-weight:lighter;
}
.design-text dd {
  width: 70%;
}

.back-text {
  display: block;
  text-align: center;
}
#company {
  width: 620px;
}
#company dl{
  display: flex;
  flex-wrap: wrap;
}
#company dt {
  width: 30%;
  font-weight: lighter;
  padding: 20px 10px;
  border-bottom: solid 1px lightgray;
}
#company dd {
  width: 70%;
  padding: 20px 10px;
  border-bottom: solid 1px lightgray;
}
#company dt:last-of-type {
  border-bottom: none;
}
#company dd:last-of-type {
  border-bottom: none;
}
#company .map {
  margin-top: 20px;
  filter: grayscale(1);
  -webkit-filter: grayscale(1);
}
#company iframe {
  height: 320px;
  width: 100%;
}

@media screen and (max-width:  767px){
  .item-list li {
    width: 45%;
  }
  #footer {
    flex-direction: column;
  }
  #footer ul {
    margin-bottom: 8px;
  }

  #design {
    display: flex;
    flex-direction: column;
  }
  .design-img {
    width: 350px;
    margin-bottom: 30px;
  }
  .design-text {
    width: 350px;
  }
  #company dl{
    flex-direction: column;
  }
  #company dt {
    width: 100%;
    border-bottom: none;
    padding-bottom: 5px;
  }
  #company dd {
    width: 100%;
    padding-top: 5px;
  }


}