#_:checked ~ nav > details > label[for=_],#_:checked ~ nav + main > article > footer > label[for=_],
#a:checked ~ nav > details > label[for=a],#a:checked ~ nav + main > article > footer > label[for=a],
#b:checked ~ nav > details > label[for=b],#b:checked ~ nav + main > article > footer > label[for=b]{background:var(--brand);border-color:var(--brand);color:var(--brand-txt);font-weight:600;}#_:checked ~ nav + main > article:not([_]),
#a:checked ~ nav + main > article:not([a]),
#b:checked ~ nav + main > article:not([b]){display:none;}