/* ブログ共通メニュー(2026-09-27)。白地・黒文字・上部固定。スマホは三本線で開閉(JSなし・チェックボックス) */
.site-menu{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid #ddd;box-shadow:0 2px 8px rgba(0,0,0,.06);font-family:'Noto Sans JP',sans-serif}
.site-menu-inner{position:relative;box-sizing:border-box;max-width:1100px;margin:0 auto;padding:0 12px;display:flex;align-items:center;gap:16px;min-height:48px}
.site-menu-brand{flex-shrink:0;font-weight:900;font-size:.95rem;color:#111;text-decoration:none;white-space:nowrap}
.site-menu-toggle{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.site-menu-button{display:none}
.site-menu-list{list-style:none;margin:0;padding:0;display:flex;gap:2px;flex:1;min-width:0;justify-content:flex-end;flex-wrap:nowrap}
.site-menu-list li{flex-shrink:0}
.site-menu-list a{display:block;padding:13px 10px;font-size:.88rem;font-weight:700;color:#111;text-decoration:none;white-space:nowrap;border-bottom:3px solid transparent}
.site-menu-list a:hover{color:#075bc8}
.site-menu-list a[aria-current="page"],.site-menu-list a.is-current{border-bottom-color:#f57c00;color:#e65100}
.site-menu-list a:focus-visible,.site-menu-brand:focus-visible{outline:3px solid #075bc8;outline-offset:-3px}
@media (max-width:900px){
  .site-menu-inner{justify-content:space-between;padding:0 6px 0 14px;min-height:50px}
  .site-menu-brand{font-size:.95rem}
  .site-menu-button{display:flex;flex-direction:column;justify-content:center;gap:5px;width:48px;height:48px;padding:0 12px;box-sizing:border-box;cursor:pointer;border-radius:8px}
  .site-menu-button span{display:block;height:3px;border-radius:2px;background:#111;transition:transform .2s,opacity .2s}
  .site-menu-toggle:focus-visible+.site-menu-button{outline:3px solid #075bc8;outline-offset:-3px}
  .site-menu-toggle:checked+.site-menu-button span:nth-child(1){transform:translateY(8px) rotate(45deg)}
  .site-menu-toggle:checked+.site-menu-button span:nth-child(2){opacity:0}
  .site-menu-toggle:checked+.site-menu-button span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
  .site-menu-list{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid #ddd;box-shadow:0 8px 16px rgba(0,0,0,.12);max-height:calc(100vh - 50px);overflow-y:auto}
  .site-menu-toggle:checked~.site-menu-list{display:flex}
  .site-menu-list li{border-top:1px solid #eee}
  .site-menu-list a{padding:14px 18px;font-size:1rem;border-bottom:0;border-left:4px solid transparent}
  .site-menu-list a[aria-current="page"],.site-menu-list a.is-current{border-left-color:#f57c00;background:#fff8f0}
}
@media print{.site-menu{display:none}}