.site-header{
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 999;
    background: #fff;
    border-bottom: 1px solid rgba(0,0,0,.06);
  }
  .header-inner{
    max-width: 1120px;
    margin: 0 auto;
    height: 72px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }
  .brand-text{ font-weight: 700; letter-spacing: .02em; }
  
  /* PC nav */
  .global-nav{ display: none; }
  .nav-list{
    display: flex;
    align-items: center;
    gap: 18px;
    list-style: none;
    margin: 0; padding: 0;
  }
  .nav-list a{
    text-decoration: none;
    color: #111;
    font-weight: 600;
  }
  
  /* hamburger */
  .hamburger{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px; height: 44px;
    border: 0;
    background: transparent;
    cursor: pointer;
  }
  .hamburger-lines span{
    display: block;
    width: 22px;
    height: 2px;
    background: #111;
    margin: 5px 0;
    transition: transform .2s ease, opacity .2s ease;
  }
  
  /* drawer */
  .mobile-drawer{
    position: fixed;
    top: 72px; left: 0; right: 0; bottom: 0;
    background: #fff;
    border-top: 1px solid rgba(0,0,0,.06);
    overflow: auto;
    padding: 16px;
  }
  .mobile-nav-list{
    list-style: none;
    margin: 0; padding: 0;
    display: grid;
    gap: 10px;
  }
  .mobile-nav-list a{
    display: block;
    padding: 12px 10px;
    border-radius: 10px;
    text-decoration: none;
    color: #111;
    background: rgba(0,0,0,.03);
  }
  .mobile-cta{ margin-top: 14px; }
  .btn-contact{
    display: block;
    text-align: center;
    padding: 14px 12px;
    border-radius: 12px;
    background: #111;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
  }
  
  /* fixed header spacer */
  .header-spacer{ height: 72px; }
  
  /* PC breakpoint */
  @media (min-width: 900px){
    .global-nav{ display: block; }
    .hamburger{ display: none; }
    .mobile-drawer{ display: none !important; }
  }
  
/* layout.css */
.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section{
  padding: 56px 0;
}
@media (max-width: 899px){
  .section{ padding: 40px 0; }
}

/* 見出し共通（SEO的にも見出し階層を崩さない） */
.section-head{
  margin-bottom: 18px;
}
.section-title{
  font-size: 26px;
  margin: 0 0 6px;
  letter-spacing: .02em;
}
.section-sub{
  margin: 0;
  color: var(--muted);
}

/* 2カラム（PCのみ） */
.layout-2col{
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 18px;
}
@media (max-width: 899px){
  .layout-2col{ grid-template-columns: 1fr; }
}

/* 記事本文の最大幅（読みやすさ） */
.prose{
  max-width: 760px;
}
.prose h2{ margin: 1.6em 0 .6em; font-size: 22px; }
.prose h3{ margin: 1.4em 0 .6em; font-size: 18px; }
.prose ul, .prose ol{ padding-left: 1.2em; }
.prose a{ text-decoration: underline; text-underline-offset: 3px; }

/* モバイルメニューの基本 */
.mobile-menu{
  display: none;
}
.mobile-menu.is-open{
  display: block;
}

/* もしスライド式にしたい場合（おすすめ） */
@media (max-width: 900px){
  .mobile-menu{
    display: block;
    position: fixed;
    top: 64px;           /* 固定ヘッダーの高さに合わせて調整 */
    right: 0;
    width: min(86vw, 360px);
    height: calc(100vh - 64px);
    background: #fff;
    transform: translateX(105%);
    transition: transform .25s ease;
    box-shadow: 0 18px 40px rgba(0,0,0,.18);
    border-left: 1px solid rgba(0,0,0,.06);
    padding: 16px;
    z-index: 9999;
    overflow: auto;
  }
  .mobile-menu.is-open{
    transform: translateX(0);
  }

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

@media (max-width: 900px){
  .mobile-drawer{
    position: fixed;
    top: 64px; /* ヘッダー高さに合わせる */
    right: 0;
    width: min(86vw, 360px);
    height: calc(100vh - 64px);
    background: #fff;
    box-shadow: 0 18px 40px rgba(0,0,0,.18);
    padding: 16px;
    z-index: 9999;
    overflow: auto;

    transform: translateX(105%);
    transition: transform .25s ease;
  }
  .mobile-drawer.is-open{
    transform: translateX(0);
  }

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


/* ロゴ + 会社名 横並び */
.header-brand .brand-link{
  display: flex;
  align-items: center;
  gap: 10px;           /* ロゴと文字の間隔 */
  text-decoration: none;
}

/* ロゴの大きさ（必要なら数値調整） */
.header-brand .brand-logo{
  height: 34px;
  width: auto;
  display: block;
}

/* 会社名 */
.header-brand .brand-text{
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .04em;
  color: #111;
  line-height: 1;
}

/* スマホ時は少し小さく */
@media (max-width: 768px){
  .header-brand .brand-logo{ height: 28px; }
  .header-brand .brand-text{ font-size: 3vw; 
                              /* 改行を禁止する */
                              white-space: nowrap; 
 }
}