.site-header{
  position: sticky; top: 0; z-index: 50;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
}
.header-inner{
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}
.brand-logo-link{
  text-decoration: none;
  display: flex;
  align-items: center;
}

.brand-text-link{
  text-decoration: none;
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.brand-logo{
  height: 48px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
  max-width: none;
}

.brand-text{
  font-size: clamp(18px, 1vw + 16px, 22px);
  font-weight: 800;
  color: #C67DFF;
  white-space: nowrap;
  min-width: 200px;
  text-align: center;
}

@media (max-width: 640px){
  .brand-logo{
    height: 40px;
    width: auto;
    object-fit: contain;
    flex-shrink: 0;
  }
  
  .brand-text{
    font-size: clamp(16px, 1vw + 14px, 20px);
    white-space: nowrap;
    min-width: 150px;
    text-align: center;
  }
}

/* ハンバーガーメニューボタン */
.hamburger-menu{
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 60;
}

.hamburger-line{
  width: 100%;
  height: 3px;
  background: #0f172a;
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

/* ハンバーガーメニューが開いている状態 */
.hamburger-menu[aria-expanded="true"] .hamburger-line:nth-child(1){
  transform: rotate(45deg) translate(6px, 6px);
}
.hamburger-menu[aria-expanded="true"] .hamburger-line:nth-child(2){
  opacity: 0;
}
.hamburger-menu[aria-expanded="true"] .hamburger-line:nth-child(3){
  transform: rotate(-45deg) translate(6px, -6px);
}

/* ナビゲーションメニュー */
.main-nav{
  display: flex;
  align-items: center;
  z-index: 2;
}

@media (max-width: 768px){
  .main-nav{
    display: none;
  }
}

.main-nav a{
  text-decoration: none;
  color: #0f172a;
  font-weight: 600;
  margin-left: 28px;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.main-nav a:first-child{
  margin-left: 0;
}
.main-nav a:hover{ color:#C67DFF; }
.main-nav a.is-active{ color:#C67DFF; }

/* レスポンシブ対応 */
@media (max-width: 768px){
  .hamburger-menu{
    display: flex;
  }
  
  .brand-text-link{
    left: 50%;
    transform: translateX(-50%);
  }
  
  .main-nav{
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    display: flex;
  }
  
  .main-nav.is-open{
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .main-nav a{
    margin: 0;
    padding: 12px 24px;
    border-bottom: 1px solid #f3f4f6;
    text-align: center;
  }
  
  .main-nav a:last-child{
    border-bottom: none;
  }
  
  .main-nav a:hover{
    background: #f8fafc;
  }
}

@media (max-width: 640px){
  .header-inner{ 
    height: 56px; 
    padding: 0 16px; 
  }
  
  .main-nav{
    top: 56px;
  }
}

/* === override: desktop only — place main-nav at the far right of header === */
@media (min-width: 769px){
  /* フレックスの開始基準にして、main-nav をautoマージンで右端に押し出す */
  .site-header[data-version="v1"] .header-inner{
    justify-content: flex-start !important; /* 既存space-betweenでも可だが、明示して安定させる */
    gap: 24px; /* ロゴ左と中央テキスト周りの間隔（必要に応じて調整） */
    position: relative; /* 念のため */
  }

  /* ナビを右端へ */
  .site-header[data-version="v1"] .main-nav{
    margin-left: auto !important;  /* 右端へ固定 */
    margin-right: 0 !important;
    z-index: 3; /* 中央テキストの上に出す保険 */
  }

  /* 中央のブランドテキストは現状維持（センター固定） */
  .site-header[data-version="v1"] .brand-text-link{
    position: absolute; 
    left: 50%; 
    transform: translateX(-50%);
    z-index: 2;
  }
}