@media screen and (min-width: 480px) {
   
    /********************
    TWO COLUMN LAYOUT
    *********************/
   
 #primary {
    width: 50%; 
    float: left;
  }
  
  #secondary {
    width: 40%;
    float: right;
  }

  
  
  /**********************
   PAGE: PORTFOLIO
   ***********************/
  
  #gallery li {
    width: 28.3333%;
  }
  
  #gallery li:nth-child(4n) {
    clear: left;
  }
    
   /**********************
   PAGE: ABOUT
   ***********************/
  
  .profile-photo {
    float: left;
    margin: 0 5% 80px 0;
   }
   
}

@media screen and (min-width: 660px) {
  
   /**********************
   HEADER
   ***********************/ 
  
  nav {
    background: none;
    float: right;
    font-size: 1.125em;
    margin-right: 5%;
    text-align: right;
    width: 45%;
  }
  
  #logo {
    float: left;
    margin-left: 5%;
    text-align:left;
    width: 45%;
  }
  
  h1 {
    font-size: 2.5em;
  }
  
  h2 {
    font-size: 0.825em;
    margin-bottom: 20px;
  }
  
 header {
    border-bottom: 5px solid #599a68;
    margin-bottom: 60px;
  } 
  
  
}