Radio buttons are checked simultaneously - html

Question

I've been trying to replicate this page https://vk.com/ You can see that they've changed the standard appearance of radio buttons in the 2nd form.
I succeeded in changing the design of the buttons but now they are all checked simultaneously.
HTML
<form class="form2">
<div class="heading">
<h2>Poprvé na VK?</h2>
<p>Okamžitá registrace</p>
</div>
<input type="text" placeholder="Vaše jméno" required>
<input type="text" placeholder="Vaše příjmení" required class="last-name">
<label class="birth">
<span>Datum narození
<i class="fa fa-question-circle-o"
aria-hidden="true"></i></span>
<input type="date" class="date" required>
</label>
<label>
<span class="gender-head">Pohlaví</span>
<div class="gender">
<input type="radio" id="1-option" name="selector" value="female" class="control">
<div class="button"></div>Žena
<input type="radio" id="2-option" name="selector" value="male" class="control">
<div class="button"></div>Muž
<input type="radio" id="3-option" value="other" name="selector" class="control">
<div class="button"></div>Jiné
</div>
</label>
<button type="submit">Zaregistrovat se</button>
<a href="#">
<i class="fa fa-facebook-square" aria-hidden="true"></i> Přihlásit se přes Facebook</a>
</form>
CSS
form {
width: 290px;
background-color: #fff;
padding: 20px 15px;
float: right;
border: 1px solid #E0E1E3;
font-size: 13px;
border-radius: 3px;
}
.form2 {
margin-right: 10px;
clear: right;
height: 380px;
display: flex;
flex-flow: row wrap;
color: #333436;
justify-content: center;
}
.form2 .heading {
flex-wrap: wrap;
margin: 0 auto;
}
.form2 h2 {
margin-top: 0px;
margin-bottom: 0px;
font-size: 20px;
font-weight: 100;
}
.form2 p {
font-size: 12px;
margin: 2px 0 0 9px;
}
.form2 input {
height: 30px;
border-radius: 3px;
border: 1px solid #DBDCDE;
width: 270px;
margin-top: -15px;
margin-bottom: 0;
}
.form2 .last-name {
margin-top: -15px;
}
.form2 span {
font-weight: 600;
margin-top: -50px;
color: #7A7B7D;
font-size: 13px;
}
.form2 .birth {
margin: -15px 0 0 10px;
}
.form2 .date {
margin-top: 10px;
margin-bottom: -100px;
}
.form2 .gender-head {
margin-left: -10px;
margin-bottom: 20px;
}
.gender {
display: flex;
width: 260px;
margin: 15px 0 0px -10px;
justify-content: space-between;
font-size: 13px;
color: #000;
}
.gender input[type="radio"] {
position: absolute;
top: -9999px;
left: -9999px;
}
.gender .button {
border: 1px solid #A3A4A6;
background: #fff;
border-radius: 50%;
height: 12px;
width: 12px;
margin-top: 2px;
margin-right: -40px;
}
.gender .button:hover {
cursor: pointer;
background-color: #EAEBED;
}
.gender .button::before {
display: block;
content: '';
height: 6px;
width: 6px;
border-radius: 50%;
}
input[type="radio"]:checked ~ .button {
border: 1px solid #5A7CA3;
}
input[type="radio"]:checked ~ .button::before {
background: #5A7CA3;
margin: 3px 2px 2px 3px;
}
::-webkit-input-placeholder {
color: #7A7B7D;
padding-left: 12px;
}
.form2 button {
height: 20px;
}
http://jsfiddle.net/Skidle/u3zj66sd/
I haven't learned JavaScript yet so I'd prefer CSS & HTML only solution. Thanks!

Answer 1

If you look at the radio buttons, by removing the position, you can see that only one is selected, and it is correct for each selection:
The problem lies in the way the presentation works. The CSS code:
input[type="radio"]:checked ~ .button::before // Is wrong.
input[type="radio"]:checked + .button::before // Is right.
Explanation
The code given for the CSS, ~ selector is a sibling selector, which selects all the selectors.
While, what you need is the + selector, which is the immediate or adjacent sibling selector. This selects only one.
Change needs to be done here:
input[type="radio"]:checked + .button::before {
background: #5A7CA3;
margin: 3px 2px 2px 3px;
}
Fiddle: http://jsfiddle.net/0rqu3s2c/
Note: There's an issue when you try to click on the other inputs. So, you might need to check what's blocking it. Please do not use absolute positioning without the desired result.