html {
  scroll-behavior: smooth;
}

body.is-menu-open {
  overflow: hidden;
}

.header {
  position: absolute;
  width: 100%;
  display: flex;
  justify-content: center;
  z-index: 1000;
}

.header__inner {
  position: absolute;
  top: -7rem;
  width: 43.4rem;
  height: 19rem;
  margin: 0 auto;
  padding-top: 7rem;
  border-radius: 50%;
  background-color: #ffffff;
}

.header__logo {
  text-align: center;
}

.header__logo a {
  display: flex;
  justify-content: center;
}

.logo {
  display: block;
  width: 17rem;
  height: auto;
}

.hamburger__btn {
  position: fixed;
  top: 2.6rem;
  right: 6.5rem;
  z-index: 1002;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  width: 8.8rem;
  height: 7rem;
  padding: 0 2.2rem 0 0;
  border: 0;
  border-radius: 50%;
  background-color: #ffffff;
  cursor: pointer;
  gap: 0.7rem;
}

.hamburger__line {
  display: block;
  height: 0.4rem;
  border-radius: 999px;
  background-color: #707070;
  transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
}

.hamburger__line:nth-child(1) {
  width: 3.7rem;
}

.hamburger__line:nth-child(2) {
  width: 3.1rem;
}

.hamburger__line:nth-child(3) {
  width: 2.5rem;
}

.hamburger__btn::after {
  color: #707070;
  content: "メニュー";
  font-family: "Zen Maru Gothic", sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1;
}

.hamburger__btn.is-open::after {
  display: none;
}

.hamburger__btn.is-open {
  align-items: center;
  padding-right: 0;
  gap: 0;
}

.hamburger__btn.is-open .hamburger__line:nth-child(1) {
  width: 3.8rem;
  transform: translate(-0.15rem, 0.4rem) rotate(38deg);
}

.hamburger__btn.is-open .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger__btn.is-open .hamburger__line:nth-child(3) {
  width: 3.8rem;
  transform: translate(-0.15rem, -0.4rem) rotate(-38deg);
}

.gnav {
  position: fixed;
  inset: 0;
  z-index: 1001;
  overflow-y: auto;
  width: 100%;
  min-height: 100vh;
  padding: 4.6rem 8rem 2rem;
  background-color: #f9edf0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.gnav.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

@media screen and (max-width: 699.98px) {
  .header__inner {
    top: -5.6rem;
    width: 17rem;
    height: 12.5rem;
    padding-top: 4.2rem;
  }

  .header.is-open .header__inner {
    z-index: 1002;
  }

  .logo {
    position: relative;
    bottom: -1.6rem;
    width: 8.8rem;
  }

  .hamburger__btn {
    top: 1.6rem;
    right: 1.8rem;
    align-items: flex-end;
    justify-content: center;
    width: 6.8rem;
    height: 5.4rem;
    padding-right: 1.7rem;
    gap: 0.45rem;
    background-color: #ffffff;
    z-index: 1003;
  }

  .hamburger__line {
    height: 0.25rem;
  }

  .hamburger__line:nth-child(1) {
    width: 3rem;
  }

  .hamburger__line:nth-child(2) {
    width: 2.5rem;
  }

  .hamburger__line:nth-child(3) {
    width: 2rem;
  }

  .hamburger__btn::after {
    font-size: 0.9rem;
  }

  .hamburger__btn.is-open .hamburger__line:nth-child(1) {
    width: 3.4rem;
    transform: translate(-0.15rem, 0.2rem) rotate(38deg);
  }

  .hamburger__btn.is-open .hamburger__line:nth-child(3) {
    width: 3.4rem;
    transform: translate(-0.15rem, -0.2rem) rotate(-38deg);
  }

  .gnav {
    padding: 8.6rem 4rem 4rem;
  }
}