[type="checkbox"]:not(:checked),
[type="checkbox"]:checked {
    position: absolute;
    left: 0;
    opacity: 0.01;
}

[type="checkbox"]:not(:checked)+label,
[type="checkbox"]:checked+label {
    position: relative;
    padding-left: 2.3em;
    font-size: 1.05em;
    line-height: 1.7;
    cursor: pointer;
}

/* checkbox aspect */
[type="checkbox"]:not(:checked)+label:before,
[type="checkbox"]:checked+label:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 1.4em;
    height: 1.4em;
    border: 1px solid #565656;
    background: #4c4c4c;
    border-radius: .2em;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, .1), 0 0 0 hsla(var(--main-accent), 93%, 48%, 20%);
    -webkit-transition: all .275s;
    transition: all .275s;
}

/* checked mark aspect */
[type="checkbox"]:not(:checked)+label:after,
[type="checkbox"]:checked+label:after {
    content: '✕';
    position: absolute;
    top: .525em;
    left: .18em;
    font-size: 1.375em;
    font-weight: bolder;
    color: hsl(var(--main-accent), 93%, 48%);
    line-height: 0;
    -webkit-transition: all .2s;
    transition: all .2s;
}

/* checked mark aspect changes */
[type="checkbox"]:not(:checked)+label:after {
    opacity: 0;
    -webkit-transform: scale(0) rotate(45deg);
    transform: scale(0) rotate(45deg);
}

[type="checkbox"]:checked+label:after {
    opacity: 1;
    -webkit-transform: scale(1) rotate(0);
    transform: scale(1) rotate(0);
    translate: -1.5px -1px;
}

/* Disabled checkbox */
[type="checkbox"]:disabled:not(:checked)+label:before,
[type="checkbox"]:disabled:checked+label:before {
    box-shadow: none;
    border-color: #565656;
    background-color: #4c4c4c;
    cursor: not-allowed;
}

[type="checkbox"]:disabled:checked+label:after {
    color: #777;
}

[type="checkbox"]:disabled+label {
    color: #aaa;
    cursor: not-allowed;
}

/* Accessibility */
[type="checkbox"]:checked:focus+label:before,
[type="checkbox"]:not(:checked):focus+label:before {
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, .1), 0 0 0 6px hsla(var(--main-accent), 93%, 48%, 20%);
}