/* =========================================
   header.css
   ========================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 5.8rem;
  background-color: var(--color-text-main);
  z-index: 100;
  line-height: 1;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  padding: 0 4rem;
  max-width: 144rem;
  margin: 0 auto;
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-img {
  width: 17.7rem;
  height: auto;
}

.header__actions {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: flex-end;
}

.header__nav {
  margin-right: 3rem;
  margin-top: 0.4rem;
}

.header__nav-list {
  display: flex;
  align-items: center;
}

.header__nav-item {
  display: flex;
  align-items: center;
}

.header__nav-item a {
  font-family: var(--font-en);
  font-weight: 400;
  font-size: 1.0rem;
  letter-spacing: 0.05em;
  color: var(--color-white);
  padding: 0 0.5rem;
  line-height: 1;
}

.header__nav-sep {
  font-family: var(--font-en);
  font-size: 1.0rem;
  color: var(--color-white);
  margin: 0;
  opacity: 0.5;
  line-height: 1;
}

.header__cta-img {
  width: 25.8rem;
  height: auto;
}

/* 初期表示制御 */
.header__hamburger,
.header__mobile-menu {
  display: none;
}

/* -----------------------------------------
   SP / Tablet (max-width: 1024px)
   ----------------------------------------- */
@media (max-width: 1024px) {
  .header {
    height: 5.0rem;
  }

  .header__inner {
    padding: 0 1.5rem;
  }
  
  .header__logo-img {
    width: 10.6rem;
  }

  .header__actions {
    justify-content: flex-end;
    gap: 1.5rem;
  }

  .header__cta-img {
    width: auto;
    height: 3.2rem;
  }

  .header__nav {
    margin-top: 0;
  }

  /* ハンバーガーボタン: 参考ファイルをベースに絶対配置へ変更 */
  .header__hamburger {
    display: block; 
    width: 3.0rem;
    height: 2.2rem; 
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 110;
    margin-left: 0.8rem;
    position: relative; /* 追記: 絶対配置の基準 */
  }

  /* HTML側にspanが3つある場合を考慮し、1つ目のspanのみをベース（真ん中の線）として使用 */
  .header__hamburger-line {
    display: none;
  }
  
  .header__hamburger-line:first-of-type {
    display: block;
    width: 100%;
    height: 0.2rem;
    background-color: var(--color-white);
    transition: background-color 0.3s 0.1s ease-in-out;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
  }

  /* 上の線 (::before) */
  .header__hamburger-line:first-of-type::before {
    content: '';
    display: block;
    width: 100%;
    height: 0.2rem;
    background-color: var(--color-white);
    position: absolute;
    top: -0.8rem;
    transition: top 0.3s 0.1s ease-in-out, transform 0.3s ease-in-out;
  }

  /* 下の線 (::after) */
  .header__hamburger-line:first-of-type::after {
    content: '';
    display: block;
    width: 100%;
    height: 0.2rem;
    background-color: var(--color-white);
    position: absolute;
    top: 0.8rem;
    transition: top 0.3s 0.1s ease-in-out, transform 0.3s ease-in-out;
  }

  /* 開閉アニメーション */
  .header__hamburger.is-active .header__hamburger-line:first-of-type {
    background-color: transparent;
  }
  
  .header__hamburger.is-active .header__hamburger-line:first-of-type::before {
    top: 0;
    transform: rotate(45deg);
  }
  
  .header__hamburger.is-active .header__hamburger-line:first-of-type::after {
    top: 0;
    transform: rotate(-45deg);
  }

  .header__mobile-menu {
    display: none; 
    position: absolute;
    top: 5.0rem;
    left: 0;
    width: 100%;
    background-color: var(--color-text-main);
    padding: 1.5rem 0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    border-top: 1px solid rgba(255,255,255,0.1);
  }

  .header__mobile-menu.is-active {
    display: block;
  }

  .header__mobile-item a {
    display: block;
    font-family: var(--font-en);
    font-size: 1.4rem;
    letter-spacing: 0.05em;
    color: var(--color-white);
    padding: 1.2rem 3rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    line-height: 1;
  }

  .header__mobile-list .header__mobile-item:last-child a {
    border-bottom: none;
  }
}