body{
  font-family: sans-serif;
}

/* header */
h1 {
  display: inline-block;
  margin: 1em 0;
}
header ul.mainNav_list {
  list-style: none;
}
.menu{
  position: fixed;
  height: 40px;
  width: 40px;
  display: inline-block;
  box-sizing: border-box;
  right: 0;
  top: 0;
  border:none;
  background-color: #FFFFFF;
}
.menu div {
  position: absolute;
  left: 0;
  height: 5px;
  width: 36px;
  display: inline-block;
  box-sizing: border-box;
}
.menu div:nth-of-type(1) {
  bottom: 30px;
  background-color: #E59191;
}
.menu div:nth-of-type(2) {
  bottom: 20px;
  background-color: #D566AE;
}
.menu div:nth-of-type(3) {
  bottom: 10px;
  background-color: #E08E7A;
}

@media screen and (min-width: 1431px) {
  header {
    width: 100%;
    /*margin: 0 2%;*/
    padding: 0 1%;
    height: 80px;
    x-background-color: green;
  }
  header img {
    height: 40px;
    display: inline-block;
    margin: 20px 20px 20px 0;
  }
  .menu{
    display: none;
  }
  header nav {
    vertical-align: top;
    display: inline-block;
    height: 30px;
    margin: 32px 0;
    font-size: 15px;
    x-background-color: red;
  }
  header ul.mainNav_list {
    display: inline-block;
    margin: 0;
    padding: 0;
  }
  header li {
    display: inline-block;
    margin-right: 1em;
  }
  header li a, header li span {
    color: #4d4d4d;
    text-decoration: none;
  }
  header li a:hover, header li span:hover {
    text-decoration: underline;
  }
  header .site_search {
    display: block;
    position: absolute;
    float: right;
    margin: 27px 0;
    padding-right: 1em;
    top: 0;
    right: 0;
  }
  header .search-box {
      width: 7em;
  }
}

@media screen and (max-width: 1430px) {
  header {
    width: 100%;
    height: 80px;
    x-background-color: green;
    position: fixed;
    z-index: 3;
    background-color: #FFFFFF;
  }
  header img {
    height: 40px;
    margin: auto;
    padding-top: 0.2em;
    padding-bottom: 0.2em;
  }
  nav{
    position: fixed;
    width: 100%;
    z-index: 1;
  }
  ul.mainNav_list {
    display: none;
  }
  ul.mainNav_list.visible {
    height: auto;
    display: block;
    margin-left: -40px;
  }
  header img.mainNav_menuBtn {
    display: block;
    position: fixed;
    height: 40px;
    width: 40px;
    top:0;
    right: 40px;
  }
  header li {
    width: 100%;
    border-bottom: 2px solid #CCC;
  }
  header li a, header li span {
    display: inline-block;
    width: 100%;
    background-color: #F4F4F4;
    color: #4d4d4d;
    text-decoration: none;
    padding-top: 10px;
    padding-bottom: 10px;
    padding-left: 10px;
  }
  header li a:hover, header li span:hover {
    text-decoration: underline;
  }
  header .site_search {
    /*display: block;*/
    display: unset;
    text-align: center;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
  }
  .menu{
    right: 0.5em;
  }
}