.header {
  display: flex;
  gap: 10.4rem;
  margin: 0 3rem;
  position: fixed;
  top: 3rem;
  z-index: 9999;
}

.header_title {
  display: flex;
  gap: 2.1rem;
}

.header_title_text {
  color: #09112C;
  font-size: 3.5rem;
  font-weight: bold;
  display: flex;
  width: 13rem;
  display: flex;
  flex-flow: column;
  margin-top: -1.3rem;
  letter-spacing: 0.7rem;

}

.header_title_text_top {
  font-size: 2rem;
  font-weight: 500;
  margin-left: -0.2rem;
  margin-bottom: -0.5rem;
  letter-spacing: 0;

}

.header_logo {
  width: 6.5rem;
  margin-left: 0rem;
  height: 6.4rem;
  margin-top: -0.6rem;

}

.nav {
  width: 90rem;
  height: 5rem;
  color: white;
  display: flex;
  gap: 3rem;
  background: #0282C1;
  background: linear-gradient(90deg, rgba(2, 130, 193, 1) 0%, rgba(14, 158, 212, 1) 45%, rgba(153, 208, 229, 1) 90%);
  border-radius: 1rem;
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 300;
  justify-content: start;
  align-items: center;
  position: relative;
  top: -0.2em;
  padding-left: 3rem;
}

.nav a {
  font-size: 1.4rem;
  letter-spacing: 0.08rem;

}

.header_circle {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: white;
  display: inline-block;
  margin-right: 0.5rem;
  margin-bottom: 0.3rem;
}

.hamburger {
  display: none;
}

@media screen and (max-width: 699.98px) {
  .header {
    width: 100%;
    margin-left: 1rem;
    top: 2.3rem;
  }

  .header_logo {
    margin-top: -1.2rem;
  }

  .header_title {
    gap: 1rem;
  }

  .header_title_text {
    font-size: 3rem;
  }

  .hamburger {
    display: block;
  }

  .header_title_text_top {
    font-size: 1.7rem;
    letter-spacing: 0.05rem;
  }

  /* ハンバーガーアイコンの外側 */
  .hamburger {
    width: 5rem;
    height: 5rem;
    /* マウスポインターを指に変更 */
    cursor: pointer;
    position: fixed;
    top: 1.8rem;
    right: 1.1rem;
    z-index: 9999;
    background: #0282C1;
    background: linear-gradient(135deg, rgba(2, 130, 193, 1) 0%, rgba(14, 158, 212, 1) 45%, rgba(153, 208, 229, 1) 90%);
    border-radius: 0.8rem;
  }

  /* ハンバーガーアイコンの内側の線 */
  .hamburger span {
    /* ボタン横線の長さと高さを設定 */
    width: 3rem;
    height: 0.1rem;
    background-color: white;
    /* 絶対位置指定（親は.hamburger） */
    position: absolute;
    left: 1rem;
    /* ボタンが押されてXに切り替わるときの動作設定 */
    transition: all 0.4s;
  }

  /* ハンバーガーメニュー3本の線の縦の位置を設定 */
  .hamburger span:nth-of-type(1) {
    top: 1.65rem;
  }

  .hamburger span:nth-of-type(2) {
    top: 2.55rem;
  }

  .hamburger span:nth-of-type(3) {
    top: 3.45rem;
  }

  /* ボタンを押した際の動作を作成 */
  .nav {
    display: block;
    display: block;
    width: 17rem;
    height: 41rem;
    transform: translateX(0);
    position: absolute;
    transition: 1s;
    right: -13.1rem;
    top: -3rem;
    padding: 8rem 0 1.5rem 2rem;
    transform: translateX(100%);
    border-radius: 0.8rem 0 0 0.8rem;
    background: #0282C1;
    z-index: 9998;
  }

  .nav a {
    display: block;
    margin-bottom: 1.4rem;

  }

  .nav.active {
    transform: translateX(-83%);

  }

  /* ボタンをXにするCSS */
  .hamburger.active span:nth-of-type(1) {
    top: 2.4rem;
    transform: rotate(-27deg);
  }

  .hamburger.active span:nth-of-type(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-of-type(3) {
    top: 2.4rem;
    transform: rotate(27deg);
  }

  .open_caver {
    opacity: 0;
  }

  .open_caver.active {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    z-index: 9997;
    height: 100vh;
    background-color: #333333;
    opacity: 0.2;
    display: block;
    transition: 0.5s;
  }
}