<style>#ss:checked ~ #box1, #ss:checked ~ #box2 {
display: none;
}</style>
<input id="ss" name="inp" value="" type="radio"> скрыть Div1 и Div2
<br>
<input id="mm" name="inp" value="" type="radio">
<br>
<input id="rr" name="inp" value="" type="radio">
<div id="box1">Div1</div>
<div id="box2">Div2</div>
Вариант
