header {
  width: 100%;
  z-index: 5;
  position: fixed;
  top: 0;
  transition: background 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
}
.header_wrap {
  position: relative;
  z-index: 1;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  transition: padding 0.3s ease;
  
}





header a.logo {
  padding: 10px 0;
  margin: 0 0 0 4%;
  width: 200px;
  transition: opacity 0.3s ease;
}

header a.logo_blue {
  display: none;
  transition: opacity 0.3s ease;
}



.header_menu {
  display: flex;
  flex-wrap: wrap;
  width:calc(100% - 400px);
  padding-left:100px;
  justify-content: flex-end;
}
.header_menu ul{
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  
}
.header_menu ul li{

}
.header_menu ul li a {
  color: #FFF;
  font-weight: 700;
  transition: color 0.3s ease;
}

header.scrolled {
  background: #FFF;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); /* フワッと感を強調 */
}

header.scrolled a.logo {
  display: none;
}

header.scrolled a.logo_blue {
  padding: 10px 0;
  margin: 0 0 0 4%;
  width: 200px;
  display: block !important;
  opacity: 1;
}


input[type=checkbox]:checked ~ #overlay {
  visibility: visible; 
}

input[type=checkbox]:checked ~ #overlay-button:hover span, input[type=checkbox]:checked ~ #overlay-button span {
  background: transparent;
  
  
}
input[type=checkbox]:checked ~ #overlay-button span:before {
  transform: rotate(45deg) translate(7px, 7px);

}
input[type=checkbox]:checked ~ #overlay-button span:after {
  transform: rotate(-45deg) translate(7px, -7px);
}
#overlay-button {
  position: fixed;
  right: 1em;
  top: 1.2rem;
  padding: 20px 7px;
  z-index: 5;
  cursor: pointer;
  user-select: none;
  background: var(--brand-color);
  
}
header.scrolled #overlay-button {

  
}
#overlay-button span {
  height: 2px;
  width: 30px;
  border-radius: 2px;
  background-color: #FFF;
  position: relative;
  display: block;
  transition: all .2s ease-in-out;
}
header.scrolled #overlay-button span{
  background-color: #FFF;;
}
#overlay-button span:before {
  top: -10px;
  visibility: visible;
}
#overlay-button span:after {
  top: 10px;
}
#overlay-button span:before, #overlay-button span:after {
  height: 2px;
  width: 30px;
  border-radius: 2px;
  background-color: #FFF;
  position: absolute;
  content: "";
  transition: all .2s ease-in-out;
}
#overlay-button:hover span, #overlay-button:hover span:before, #overlay-button:hover span:after {
  background: #FFF;
}



#overlay {
  height: 100svh;
  width: 100vw;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2;
  visibility: hidden;
  position: fixed;
  padding: 60px 0;
  left: 0;
  overflow-y: auto; /* 縦方向のオーバーフローを表示 */
  top:0;
  padding-bottom: 60px;
}
#overlay.active {

}


header #overlay ul{
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 60px;
  
}
header #overlay ul li{
  text-align: center;
  width: 100%;
  padding: 0 4%;
}
header #overlay ul li a{
  font-size: 1.8rem;
  line-height: 120%;
  font-weight: 700;
  color:#FFF;
}
header #overlay ul li a span{
  color:var(--brand-color);
  font-size: 1.2rem;
}

header ul.menu {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-wrap: wrap;
  right: 0;
  gap: 40px;
  align-items: center;
}
header ul.menu li a{
  font-weight: 700;
  text-decoration: underline;
}