.header {
top: 0;
width: 100%;
z-index: 999;
inset: 0 0 auto;
transition: background-color .3s ease, color .3s ease;
}
#header {
    position:sticky;
    background: var(--color-brand);
}
#top-header {
position:fixed;
top: 0;
width: 100%;
z-index: 999;
inset: 0 0 auto;
transition: background-color .3s ease, color .3s ease;
}
#top-header.is-solid {
background: var(--color-brand);
    }
.header-nav.sp {
display: none;
}
.header-wrap {
display: flex;
justify-content: space-between;
align-items: flex-start;
padding-top: 8px;
padding-bottom: 8px;
gap: 20px;
align-items: center;
transition: background-color .3s ease, color .3s ease;
}
#top-header .header-wrap {
    align-items: flex-start;
}
#top-header.is-solid .header-wrap {
    align-items: center;
}
.header-logo {
max-width: 200px;
}
.header-nav ul {
display: flex ;
flex-wrap: wrap;
row-gap: 4px;
justify-content: flex-end;
}
.header-nav ul li a {
color: var(--color-white);
display: flex;
padding: 0 16px;
}
.header-nav ul li:not(:last-child) a {
border-right: 1px solid var(--color-white);
}
.header-inner{
display: grid; grid-template-columns: auto 1fr auto;
align-items: center; gap: var(--space-16);
min-height: 64px;
}
.brand .site-logo{ display: inline-flex; align-items: center; font-weight: 800; color: var(--color-brand); }
.brand img{ max-height: 48px; width: auto; }

.main-nav{ grid-column: 2 / -1; }
.nav-list{
list-style: none; display: none; margin: 0; padding: 0;
gap: var(--space-24);
}
.nav-list > li > a{
display: inline-block; padding: .75rem .25rem;
color: var(--color-text);
}
.nav-list > li > a:focus-visible,
.nav-list > li > a:hover{ color: var(--color-brand); }

/* Mobile toggle (checkbox hack) */
.nav-toggle{ display: none; }
.menu-toggle{
grid-column: 3 / 4;
width: 40px; height: 40px; display: grid; place-items: center;
border-radius: var(--radius-xs);
border: 1px solid var(--color-line);
}
.menu-toggle .bar{
width: 20px; height: 2px; background: var(--color-text); display: block; margin: 3px 0;
}
#nav-toggle:checked ~ nav .nav-list{ display: grid; }
#nav-toggle:checked + label.menu-toggle{ background: var(--color-surface); }

/* Mobile nav panel */
.main-nav{ position: relative; }
.main-nav .nav-list{
position: absolute; right: 0; top: calc(100% + 4px);
background: var(--color-white);
border: 1px solid var(--color-line);
border-radius: var(--radius-sm);
padding: var(--space-8) var(--space-16);
box-shadow: var(--shadow-1);
}
/* >=600: inline nav */
@media (min-width: 600px){
.menu-toggle{ display: none; }
.main-nav .nav-list{
position: static; display: flex; background: transparent; border: 0; box-shadow: none; padding: 0;
}
}
@media (max-width: 768px) {
.header-logo img {
    transition:  .3s ease;
    height: 40px;
    width: auto;
}
#header img, #top-header.is-solid img {
    height: 32px;
}
.header-nav.pc {
display: none;
}
.header-nav.sp {
display: flex;
gap: 20px;
align-items: center;
}
.hamburger {
    position: relative;
    height: 16px;
    width: 24px;
    right: 0px;
    }
    .hamburger span {
    display: block;
    position: relative;
    height: 1px;
    width: 24px;
    background: var(--color-white);
    transition: 0.4s;
    }
    .hamburger span:nth-of-type(1) {
    top: 0;
    }
    .hamburger span:nth-of-type(2) {
    top: 6px;
    }
    .hamburger span:nth-of-type(3) {
    top: 12px;
    }
    .hamburger.active span:nth-of-type(1) {
    top: 8px;
    transform: rotate(45deg);
    }
    .hamburger.active span:nth-of-type(2) {
    opacity: 0;
    }
    .hamburger.active span:nth-of-type(3) {
        top: 6px;
        transform: rotate(-45deg);
    }
    /* メニュー開いてる間は常に“ソリッド状態”で上書き */
/* body.nav-open #top-header {
    background: var(--color-brand);
    もし is-solid でロゴ縮小してるなら同じ指定をここにも
    例: 高さやパディングを is-solid と揃える
  } 
  */
  
  /* ロゴ縮小や色反転を is-solid でやってるなら、同じ見た目に */
  /* body.nav-open #top-header img {
    height: 32px; #top-header.is-solid img と同値に
  } */
  .header-nav ul {
    flex-direction: column;
    row-gap: 0;
    }
    .header-nav ul li a {
        padding: 8px 20px;
        border-bottom: 1px solid var(--color-grey);
    }
    .header-nav ul li:not(:last-child) a {
        border-right: none;
    }
    @media (prefers-reduced-motion: reduce){
        #sp-nav.drawer, .drawer-overlay { transition: none; }
      }      
      #sp-nav.drawer{
        position: fixed;
        inset: 0 auto 0 0;     /* 左に固定 */
        width: 68vw;
        max-width: 420px;
        height: 100dvh;        /* 端末UIを考慮したvh */
        transform: translateX(-100%);
        transition: transform .3s ease;
        background: var(--color-brand);
        z-index: 1001;
      
        /* ここが重要：中身だけスクロール可 */
        overflow-y: auto;
        overscroll-behavior: contain;     /* 背景のバウンドを伝播させない */
        -webkit-overflow-scrolling: touch;/* iOSの慣性スクロール */
      }
      
      /* 薄暗い背景（残り4割を覆う） */
      .drawer-overlay {
        position: fixed;
        inset: 0;                    /* 画面全体 */
        background: rgba(0,0,0,.45); /* お好みで濃さ調整 */
        opacity: 0;
        transition: opacity .3s ease;
        pointer-events: none;        /* 閉じてる間はクリック不可 */
        z-index: 1000;
      }
      
      /* 開いた時の状態（bodyに付く） */
      body.nav-open #sp-nav.drawer {
        transform: translateX(0);
      }
      body.nav-open .drawer-overlay {
        opacity: 1;
        pointer-events: auto;        /* 背景タップで閉じられる */
      }
      body.nav-open {                 /* 背景スクロール禁止 */
        overflow: hidden;
        touch-action: none;
      }

    .search-btn a {
        display: block;
        height: 24px;
    }
/* 検索バーの器（ダーク背景上で見やすく） */
.drawer-search.infield-icon{
    position: relative;
    display: flex;
    align-items: center;
    margin: 12px;
    padding: 0px 12px;
    border-radius: 999px;
    background: #333;
  }
  
  /* 左アイコン＝送信ボタン（44px以上でタップしやすく） */
  .drawer-search .search-btn-left{
    position: absolute; left: 8px; top: 50%; transform: translateY(-50%);
    width: 36px; height: 36px;        /* 必要なら 44px に */
    border: 0; 
    border-radius: 50%;
    display: grid; place-items: center;
    background: transparent;          /* 透明：枠の中に置くだけ */
    color: rgba(255,255,255,.7);      /* SVGがcurrentColorなら色が反映 */
    cursor: pointer;
    padding: 8px 0;
    line-height: 1;
  }
  .drawer-search .search-btn-left:hover,
  .drawer-search .search-btn-left:focus-visible{
    outline: none;
    background: rgba(255,255,255,.12); /* 軽いホバー/フォーカス */
  }
  .drawer-search .search-btn-left svg{
    width: 18px; height: 18px; display: block;
  }
  
  /* 入力欄本体（左ボタンぶん余白を確保） */
  .drawer-search input{
    flex: 1; border: 0; outline: none; background: transparent;
    color: #fff; font-size: 16px; line-height: 1.2;
    padding: 10px 12px 10px 32px;  /* ← 左にボタン分の余白 */
  }
  .drawer-search input::placeholder{ color: #666; }
  
  /* フォーカス時の強調 */
  .drawer-search:focus-within{
    border-color: var(--color-brand, #fff);
    box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-brand, #fff) 22%, transparent);
  }
  
  /* ダーク/ソリッド状態でも馴染む（必要なら） */
  body.nav-open #top-header .drawer-search{
    background: rgba(255,255,255,.1);
    border-color: rgba(255,255,255,.28);
  }
  
}