@charset "utf-8";
@import url("https://fonts.googleapis.com/css?family=Orbitron&display=swap");
*{
  margin:0;
  padding:0;
}
ul, ol, li{
  list-style: none;
}
body{
  background: #efefef;
}
header{
  width:400px;
  height: 100%;
  background: linear-gradient(45deg, aqua, royalblue);
  position:fixed;
  top:0;
  left:0;
}
main{
  margin-left:400px;
  box-sizing:border-box;
  padding:20px;
}
header h1{
  font:bold 50px/1 'orbitron';
  color:#fff;
  letter-spacing:1px;
  position:absolute;
  left:50px;
  top:50%;
  transform: translateY(-150%);
}
header h1::before{
  content: 'UI/UX DEVELOPMENT';
  display:block;
  font:14px/1 'orbitron';
  color:#fff;
  letter-spacing: 2px;
  position: absolute;
  left:0px;
  top:140px;
  opacity: 0.8;
}
header h1::after{
  content:'';
  display:block;
  width:150px;
  height:2px;
  background: #fff;
  margin-top: 20px;
}
header ul{
  position: absolute;
  left: 40px;
  bottom: 100px;
}
header ul li{
  float: left;
  margin-right: 10px;
}
header ul li a{
  font-size: 20px;
  color: #fff;
}
header ul li a span{
  display: inline-block;
  font-weight: bold;
  opacity: 0.7;
  transform: scale(0.7) translateX(-10px);
}
main section{
  width: 100%;
}
main section::after{
  content:'';
  display:block;
  clear:both;
}
main section article{
  width: 20%;
  float:left;
  box-sizing: border-box;
  padding: 12px;
}
main section article div{
  width: 100%;
  height: 100%;
  background: #fff;
  border-radius: 4px;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.1);
  box-sizing:border-box;
  padding:14px;
}
main section article div img{
  width:100%;
}
main section article div h2{
  margin-top: 15px;
  font: bold 11px/1 'orbitron';
  letter-spacing: 1px;
  color:#444;
  margin-bottom: 5px;
}
main section article div p{
  font:10px/1.2 'arial';
  color: #777;
  margin-bottom: 15px;
}
main ul{
  width:100%;
  margin-bottom: 10px;
  margin-right: 20px;
}
main ul::after{
  content:'';
  display:block;
  clear:both;
}
main ul li{
  float:right;
  margin-right: 20px;
  width: 100px;
  height: 26px;
}
main ul li a{
  display: block;
  width: 100%;
  height: 100%;
  font: bold 7px/26px 'orbitron';
  color: #aaa;
  letter-spacing: 1px;
  text-align: center;
  border-radius: 5px;
  box-shadow: 0px 0px 10px rgba(0,0,0,0.05);
  background: #fff;
}
main ul li.on a{
  background: linear-gradient(45deg,#67faf3,#58abf8);
  box-shadow:0px 5px 20px rgba(0, 255, 255, 0.527);
  color:#fff;
}
/* 미디어쿼리 */
@media screen and(max-width:1599px){
  header{
    width:350px;
  }
  main{
    margin-left: 350px;
  }
  main section article{
    width: 25%;
  }
}
@media screen and (max-width:1199px){
  header{
    width: 100%;
    height: 80px;
    position: relative;
  }
  header h1{
    font:bold 24px/1 'orbitron';
    transform:translateY(-50%);
  }
  header h1::before, #header h1::after{
    display:none;
  }
  header ul{
    left:83%;
    bottom: 25px;
  }
  header ul li{
    margin-right: 20px;
  }
  header ul li a{
    font-size: 20px;
  }
  header ul li a span{
    display:none;
  }
  main{
    width:100%;
    margin-left: 0;
  }
  main section article{
    width: 25%;
  }
  @media screen and (max-width:899px){
    header ul{
      left: 80%;
    }
    main section article{
      width: 33.33%;
    }
  }
  @media screen and (max-width:679px){
    header ul{
      left:70%;
    }
    main section article{
      width: 50%;
    }
  }
  @media screen and (max-width:539px){
    header ul{
      display:none;
    }
    main ul{
      margin-right: 0;
      box-sizing: border-box;
      padding: 0 13px;
    }
    main ul li{
      margin-right: 2%;
      width:32%;
    }
    main ul li:nth-of-type(1){
      margin-right: 0%;
    }
    main section article{
      width:100%;
    }
    main section article{
      width:100%;
    }
  }
  
}