@media screen and (min-width: 480px) {
  
/***************************************
TWO COLUMN LAYOUT
****************************************/
  
  #primary {
    width: 50%;
    float: left;
  }
  
  #secondary {
    width: 40%;
    float: right;
  }
  
  
/***************************************
  3 * 5 = 15
  100% -15% = 85%
  85 / 3 = 28.33333333
****************************************/
  
  
/***************************************
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: 1.5em;
    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: 1.5em;
    margin-bottom: 20px;
  }
  
  header {
    border-bottom: 5px solid #599a68;
    margin-bottom: 60px;
  }
  
}