#custom-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  width: 100%;
  height: 70px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  backdrop-filter: blur(0px);
}
.header-logo {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 10;
}
.header-logo img {
  width: auto;
  filter: brightness(0) invert(1);
}
.header-nav {
  position: absolute;
  right: 100px;
  z-index: 10;
}
.header-nav ul {
  display: flex;
  flex-wrap: nowrap;
  list-style-type: "";
}
.header-nav li a {
  text-decoration-line: unset;
  display: block;
  padding: 0.5em;
}
.header-nav .plain-item {
  padding-inline: 1em;
}
.header-nav .plain-item a {color: #fff;}
.header-nav li.round-btn a {
  padding: 0.5em 1em;
  margin-inline: 0.4em;
  background-color: #ddd;
  border-radius: 50px;
}

/*ハンバーガーメニュー*/
.hamburger-menu {
  position: absolute;
  top: 0;
  right: 0;
  width: 70px;
  height: auto;
  aspect-ratio: 1/1;
  background-color: #c09a6c;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1001;
}
.menu--open.hamburger-menu {
  z-index: 1001;
}
.menu__btn {
  position: relative;
  display: block;
  width: 2rem;
  height: 1.4rem;
}
.menu__line {
  position: absolute;
  left: 0;
  display: block;
  width: 100%;
  height: 2px;
  margin: auto;
  background-color: #3e1e1e;
  transition: all 0.3s ease-in-out;
}
.menu__line:nth-child(1) {
  top: 0;
}
.menu__line:nth-child(2) {
  top: 0.7rem;
}
.menu__line:nth-child(3) {
  top: 1.4rem;
}
.menu--open .menu__line:nth-child(1) {
  top: 0.7rem;
  rotate: 45deg;
}
.menu--open .menu__line:nth-child(2) {
  opacity: 0;
}
.menu--open .menu__line:nth-child(3) {
  top: 0.7rem;
  rotate: -45deg;
}
.menu--open .menu__btn {
  z-index: 1001;
}

/*オーバーレイ*/
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease-in-out;
  z-index: 999;
}
.overlay.active {
  opacity: 1;
  visibility: visible;
}

/*スライドメニュー*/
.slide-menu {
  position: fixed;
  top: 0;
  right: -550px;
  width: min(100%, 550px);
  height: 100vh;
  background-color: #fffaf4;
  z-index: 1000;
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
  transition: right 0.3s ease-in-out;
  overflow-y: auto;
  overflow-x: hidden;
  color: #4d3e2d;
}
.slide-menu.active {
  right: 0;
}
.slide-menu li a {
  text-decoration-line: unset;
}
.slide-menu__container {
  width: min(85%, 25rem);
  margin-inline: auto;
  padding-block: 6rem;
}
.slide-menu__group {
  padding-bottom: 2.5rem;
}
.slide-menu__label {
  font-weight: bold;
  border: 1px solid;
  border-radius: 4px;
  display: inline-block;
  padding: 0 0.5em;
  font-size: 1rem;
  letter-spacing: 0.08em;
}
.slide-menu__contents {
  margin-top: 0.25em;
}
.slide-menu__item {
  font-size: 1.1rem;
  line-height: 1;
  border-bottom: 1px solid #d4c9bd;
}
.slide-menu__item > a {
  display: block;
  padding: 0.9rem 0.2rem;
  transition: background-color 0.3s ease;
}
.slide-menu__item a:hover {
  background-color: #eee4d9;
}
.slide-menu__button:hover {
  background-color: #eee4d9;
}
.slide-menu__sub-nav-item:hover {
  background-color: #eee4d9;
}
.slide-menu__button {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 0.3rem 0.9rem 0.2rem;
  transition: background-color 0.3s ease;
}
.slide-menu__icon {
  position: relative;
  flex-shrink: 0;
  width: 15px;
  height: 15px;
}
.slide-menu__icon::before,
.slide-menu__icon::after {
  content: "";
  display: inline-block;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  height: 2px;
  border-radius: 20px;
  background-color: #a7865d;
}
.slide-menu__icon::after {
  transform: translateY(-50%) rotate(90deg);
  transition: transform 0.5s;
}
.slide-menu__button[aria-expanded="true"] .slide-menu__icon::after {
  transform: translateY(-50%) rotate(180deg);
}
.slide-menu__sub-nav {
  height: 0;
  overflow: hidden;
  transition: height 0.3s;
}
.slide-menu__sub-nav-item {
  font-size: 0.85em;
}
.slide-menu__sub-nav-item a {
  padding-left: 1.5rem;
  padding-block: 0.9rem;
  position: relative;
  display: flex;
  align-items: center;
}
.slide-menu__sub-nav-item a::before {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 20px;
  background-color: #edcfac;
  position: absolute;
  left: 5px;
}


@media screen and (max-width: 900px) {
  .header-nav .plain-item {
    display: none;
  }
  .header-nav .round-btn {
    display: none;
  }