footer {
    padding: 3rem 0 1rem;
    position: relative;
    overflow: hidden;
    background-color: var(--color-main);
}

footer > #particles-bg {
    position: absolute;
    left: 0;
    top: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
}

footer > *:not(#particles-bg) {
    position: relative;
    z-index: 1;
}

.footer-section .list-group-item {
    border: none;
    padding-left: 0;
    background-color: transparent;
    color: #fff;
}

.list-group-item a {
    color: #fff;
    transition: color .2s linear;
    text-decoration: none;
    position: relative;
}

.list-group-item a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0 auto;
    width: 0;
    height: 1px;
    background-color: #fff;
    transition: width .2s linear, background-color .2s linear;
}

.list-group-item a:hover,
.list-group-item a:focus-visible {
    color: #ddd;
}
.list-group-item a:hover::after,
.list-group-item a:focus-visible::after {
    width: 100%;
    background-color: #ddd;
}

.footer-bottom {
    text-align: center;
}