.header_bottom .nav-button {
  display: none;
}
.header_bottom .nav {
  display: flex;
  display: -webkit-flex;
  justify-content: space-between;
  -webkit-justify-content: space-between;
  align-items: center;
  width: 80%;
  height: 75px;
  margin-left: auto;
  font-size: 0;
  overflow: hidden;transform: skew(-20deg);
}
.header_bottom .nav li{
  position: relative;
  align-items: center;
  height: 100%;
  border-left: 1px solid #4d4d4d;
}
.header_bottom .nav li:last-child{
  border-right: 1px solid #4d4d4d;
}
.header_bottom .nav li a{
  position: relative;
  display: block;
  font-size: 1.6rem;
  font-family: 'Oswald', sans-serif;
  letter-spacing: 0.1em;
  text-align: center;
  color: #00a4e6;
  padding: 0.5em 1em;
  transform: skew(20deg);
}
.header_bottom .nav li a:after{
  position: absolute;
  content: '';
  top: 60px;
  left: 0;
  right: 0;
  margin: auto;
  width: 20px;
  height: 2px;
  background-color: #c40018;
}
.header_bottom .nav li a span{
  font-size: 1.2rem;
  font-family: 'Noto Sans JP', sans-serif;
  text-align: center;
  color: #a9a9a9;
}
.header_bottom .nav a:hover {
  color: #c40018;
  transition: 0.3s;
}
.header_bottom .nav li a:hover span{
  color: #c40018;
  transition: 0.3s;
}

.header_bottom .nav-wrap.open {
  display: block;
}
.header_bottom .nav-wrap.close {
  display: none;
}

@media screen and (min-width: 769px) {
.header_bottom .nav-wrap {
  display: block !important;
}
}

@media screen and (max-width: 769px) {
.header_bottom .nav {
  display: inline-block;
  width: 100%;
  height: auto;
  margin-left: 0;
}
.header_bottom .nav-button {
  position: absolute;
  display: block;
  cursor: pointer;
  top: 20px;
  right: 20px;
}
.header_bottom .nav-wrap {
  position: fixed;
  left: 0;
  top: 0;
  display: none;
  z-index: 10;
  background-color: rgba(0,164,230,0.95);
  width: 100%;
  height: 100%;
}
.header_bottom .nav-wrap .nav {
  height: 100%;
  padding-top: 50px;
  position: relative;
  overflow-x: hidden;
  overflow-y: auto;
  text-align: center;
}
.header_bottom .nav-wrap .nav li{
  display: inline-block;
  /*margin: 2em;*/
}
.header_bottom .nav-wrap .nav li a{
  color: #fff;
}
.header_bottom .nav li{
  width: 100%;
  height: auto;
  border-left: none;
}
.header_bottom .nav li:last-child{
  border-right: none;
}
.header_bottom .nav li a{
  padding: 10px 0;
}
.header_bottom .nav li a span{
  color: #4d4d4d;
}
}
@media screen and (max-width: 480px) {
.header_bottom .nav-wrap .nav li{
  padding-right: 60px;
}
}

/*メニューボタンのエフェクト*/
.nav-button,
.nav-button span {
  display: inline-block;
  transition: all 0.4s;
  box-sizing: border-box;
}
.nav-button {
  z-index: 20;
  position: relative;
  width: 40px;
  height: 36px;
}
.nav-button span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 5px;
  background-color: #fff;
}
.nav-button span:nth-of-type(1) {
  top: 0;
}
.nav-button span:nth-of-type(2) {
  top: 15px;
}
.nav-button span:nth-of-type(3) {
  bottom: 0;
}
.nav-button.active span:nth-of-type(1) {
  -webkit-transform: translateY(15px) rotate(-45deg);
  transform: translateY(15px) rotate(-45deg);
  background-color: #fff;
}
.nav-button.active span:nth-of-type(2) {
  opacity: 0;
}
.nav-button.active span:nth-of-type(3) {
  -webkit-transform: translateY(-15px) rotate(45deg);
  transform: translateY(-15px) rotate(45deg);
  background-color: #fff;
}
}