Многоуровневое выдвижное боковое меню на CSS3

by Holton

HTML

<input type="checkbox" id="guklin-ztukolsa">
<nav class="zorsamilan">
<label for="guklin-ztukolsa" class="vesazemik-drolam" onclick></label>
  
</nav>
<div class="gsamitul_samgferas">
</div>

CSS

@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,300&subset=latin,cyrillic);
* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    font-size: 15.9px;
    font-weight: normal;
    line-height: 21.8px;
    color: black;
    background: #fff6f6;
}

/* Фиктивный контент */
.gsamitul_samgferas {
    max-width: 1024px;
    margin: 0 auto;
        padding: 0 50px;
    -webkit-transition: -webkit-transform .5s;
    -moz-transition: -moz-transform .5s;
    transition: transform .5s;
}
.gsamitul_samgferas > p {
  margin: .25em 0 .75em 0;
}
[id='guklin-ztukolsa']:checked ~ .gsamitul_samgferas {
    -webkit-transform: translateX(15em);
    -moz-transform: translateX(15em);
    transform: translateX(15em);
}

h1,
h2 {
    margin-bottom: 22px;
    color: #191919;
    font-weight: 300;
}
h1 {
    font-size: 32px;
    line-height: 38px;
    text-align: center;
}
h2 {
    color: #565d66;
    font-size: 26px;
    line-height: 32px;
}
a {
    color: #006b05;
    text-decoration: none;
}
/****** Боковое меню ******/
[id='guklin-ztukolsa'] {
  position: absolute;
  top: -9999px;
  left: -9999px;
}

.vesazemik-drolam {
    position: absolute;
    left: 100%;
    display: block;
    padding: 0.3em 0.5em;
    font-size: 1.4em;
    color: #f7f4f4;
    transition: left .3s cubic-bezier(0.42, 0, 0.48, 0.95);
    cursor: pointer;
    user-select: none;
    margin: 0;
    background: #1962a2;
}
.vesazemik-drolam:after {
    content: "\2261";
    font-size: 1.2em;
}
.vesazemik-drolam:hover {
  transition: box-shadow .3s ease-in-out;
   box-shadow: 4px 4px 10px 0px rgba(78, 42, 42, 0.3);
  -moz-box-shadow: 4px 4px 10px 0px rgba(78, 42, 42, 0.3);
  -webkit-box-shadow: 4px 4px 10px 0px rgba(78, 42, 42, 0.3);
}

[id='guklin-ztukolsa']:checked ~ .vesazemik-drolam {
    color: #fff;
    left: 15em;
}
.zorsamilan {
    width: 15em;
    background: #1962a2;
    position: fixed;
    top: 0;
 ...