純粋な CSS3 を使用してラジオ ボタンのサンプル コード共有を美しくする方法

<label for="man" class="radio">
    <span class="radio-bg"></span>
    <input type="radio" name="sex" id="man" value="男" checked="checked" /> 男
    <span class="radio-on"></span>
</label>
<label for="woman" class="radio">
    <span class="radio-bg"></span>
    <input type="radio" name="sex" id="woman" value="女" /> 女
    <span class="radio-on"></span>
</label>

.radio{
    display: inline-block;
    position: relative;
    line-height: 18px;
    margin-right: 10px;
    cursor: pointer;
}
.radio input{
    display: none;
}
.radio .radio-bg{
    display: inline-block;
    height: 18px;
    width: 18px;
    margin-right: 5px;
    padding: 0;
    background-color: #45bcb8;
    border-radius: 100%;
    vertical-align: top;
    box-shadow: 0 1px 15px rgba(0, 0, 0, 0.1) inset, 0 1px 4px rgba(0, 0, 0, 0.1) inset, 1px -1px 2px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.2s ease;
}
.radio .radio-on{
    display: none;
}
.radio input:checked + span.radio-on{
    width: 10px;
    height: 10px;
    position: absolute;
    border-radius: 100%;
    background: #FFFFFF;
    top: 4px;
    left: 4px;
    box-shadow: 0 2px 5px 1px rgba(0, 0, 0, 0.3), 0 0 1px rgba(255, 255, 255, 0.4) inset;
    background-image: linear-gradient(#ffffff 0, #e7e7e7 100%);
    transform: scale(0, 0);
    transition: all 0.2s ease;
    transform: scale(1, 1);
    display: inline-block;
}