html{
  scroll-behavior: smooth;
}
body{
  padding-top: 110px;
}
#page{
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);

}
#update{
  position: relative;
}
#open_menu_button{
  cursor: pointer;
  position: absolute;
  top: 50%;
  right: 20px;
  width: 80px;
  height: 80px;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  transition: 0.4s;
}
body:not(.open_menu) #open_menu_button:hover{
  gap: 12px;
}
#open_menu_button span{
  display: block;
  width: 80px;
  height: 4px;
  background-color: #838383;
  transition: 0.4s;
}
#close_menu_button{
  transition: 0.4s;
  cursor: pointer;
  position: absolute;
  top: 20px;
  right: 20px;
  display: inline-block;
}
#close_menu_button:hover{
  transform: scale(1.1);
}
#close_menu_button span{
  width: 35px;
  height: 4px;
  background-color: #838383;
  margin: 6px 0;
  display: block;
  transition: 0.4s;
}
#close_menu_button:hover span{
  background-color: #333;
}

#close_menu_button span:nth-child(1){
  transform: translate(0, 10px) rotate(-45deg);
}
#close_menu_button span:nth-child(2){
  opacity: 0;
}
#close_menu_button span:nth-child(3){
  transform: translate(0, -10px) rotate(45deg);
}
#menu_overlay{
  position: fixed;
  z-index: 998;
  background-color:#ffffff6b;
  left: 0;
  bottom: 0;
  right: 0;
  top: 0;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s ease-out;
}
#menu_wrap{
  position: fixed;
  z-index: 999;
  top: 0;
  left: -100%;
  width: 300px;
  height: 100dvh;
  background-color: #fff;
  padding:  0;
  transition: 0.3s ease-out;
  overflow-y: auto;
  box-sizing: border-box;
  filter: drop-shadow(0 0 4px #ccc);

}
#menu_content{
  width: 100%;
  height: 100%;
  overflow-y: auto;
  padding: 60px 20px;
  box-sizing: border-box; 
  font-family: "Roboto Condensed", sans-serif;
  font-optical-sizing: auto;
  font-weight: 300;
  font-style: normal;
}
#menu_content::-webkit-scrollbar {
  width: 5px;
}

/* Track */
#menu_content::-webkit-scrollbar-track {
  background: #f1f1f1;
}

/* Handle */
#menu_content::-webkit-scrollbar-thumb {
  background: #888;
}

/* Handle on hover */
#menu_content::-webkit-scrollbar-thumb:hover {
  background: #555;
}
#menu_content a {
  display: block;
  padding: 10px;
  border-bottom: 1px solid #000;
  color: #000;
  font-size: 22px;
  text-decoration: none;
  font-weight: 300;
  box-sizing: border-box;
}
body.open_menu #menu_wrap{
  left: 0;
}
body.open_menu #menu_overlay{
  visibility: visible;
  opacity: 1;
}
body.open_menu #open_menu_button span{
  width: 60px;
}
body.open_menu #open_menu_button span:nth-child(1){
transform: rotate(-45deg) translateY(16px) translateX(-4px);
}

body.open_menu #open_menu_button span:nth-child(2){
  
  opacity: 0;
}
body.open_menu #open_menu_button span:nth-child(3){
  transform: rotate(45deg) translateY(-16px) translateX(-4px); 
  /* rotate(45deg) translateY(-1px) translateX(-5px); */
}
#to_top{
  position: fixed;
  bottom: 0;
  width: 100%;
  opacity: 0;
  transition: opacity 0.3s ease-out;
}
#to_top.show{
  opacity: 1;
}
#to_top_wrap{
  width: 900px;
  margin: 0 auto;
  display: block;
  text-align: right;
  padding: 10px 20px;
  box-sizing: border-box;
}
#to_top_wrap a{
  display: block;
  margin-left: auto;
  margin-right: 0;
  width: 80px;
  height: 60px;
  background-color: #dfdfdf;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}
#to_top_wrap a span{
  display: block;
  width: 35px;
  background-color: #838383;
  height: 4px;
  --rotate: 45deg;
  --translateX: 4px;
  --translateY: 4px;
}
#to_top_wrap a span:nth-child(1){
  transform: rotate(calc(var(--rotate) * -1)) translateX(var(--translateX)) translateY(var(--translateY));
}
#to_top_wrap a span:nth-child(2){
  transform: rotate(var(--rotate)) translateX(calc(var(--translateX) * -1)) translateY(var(--translateY)) ;
}