.ch05-topnav{max-width:920px;margin:10px auto 12px;padding:0 10px;display:flex;justify-content:center;gap:8px;align-items:center;font-family:"Yu Gothic","Hiragino Kaku Gothic ProN",sans-serif}
.ch05-topnav a{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:7px 16px;border:1px solid #cbd9d4;border-radius:12px;background:#fffdf9;color:#4e8177;text-decoration:none;font-size:12px;box-shadow:0 2px 7px rgba(58,89,82,.04)}
.ch05-topnav a:hover{transform:translateY(-1px);box-shadow:0 5px 12px rgba(58,89,82,.08)}
@media(max-width:600px){.ch05-topnav{margin:8px auto 10px}.ch05-topnav a{min-height:36px;padding:7px 13px}}