site/_src/_assets/styles/bigchain/_menus.scss

.menu {
    position: relative;
    z-index: 10;
    flex: 1;

    .grid__col {
        text-align: center;

        @media ($screen-md) {
            text-align: left;

            &:last-child { text-align: right; }
        }
    }
}

.menu__link {
    @extend .small;
    display: inline-block;
    padding: ($spacer / 2);
    text-transform: uppercase;
    box-shadow: none;
    position: relative;
    line-height: 1;

    @media ($screen-md) {
        padding: ($spacer * 2) $spacer;
    }

    // link line
    &:after {
        content: "";
        position: absolute;
        height: 2px;
        width: 30px;
        background: #fff;
        display: block;
        left: 50%;
        margin-left: -15px;
        bottom: 0;
        // hidden by default
        transform: scale(0);
        transform-origin: center;
        transition: transform .2s ease-out;

        @media ($screen-md) {
            bottom: $spacer * 1.5;
        }
    }

    &:hover,
    &:focus,
    &.active {
        background: transparent;
        // show link line
        &:after { transform: scale(1); }
    }
}

.menu__logo {
    display: block;
    box-shadow: none;

    svg {
        @extend .transition;
        opacity: .8;
        margin-left: auto;
        margin-right: auto;
    }

    &:hover,
    &:focus {
        background: transparent;

        svg { opacity: 1; }
    }
}


//
// Main menu overlaying a dark background image
// in front page hero or page headers
//
.menu--main {
    background: rgba($brand-main-blue-dark, .35);
    backdrop-filter: saturate(150%) blur(10px);
    border-bottom: 1px solid rgba($gray, .9);
    padding-top: $spacer;
    padding-bottom: $spacer;

    .menu__logo {
        margin-bottom: $spacer / 2;

        @media ($screen-md) {
            margin-bottom: 0;
        }
    }

    .menu__link {
        color: #fff;
        opacity: .9;

        &:hover,
        &:focus,
        &.active {
            opacity: 1;
        }
    }

    @media ($screen-md) {
        padding-top: 0;
        padding-bottom: 0;
    }
}

.menu-overflow {
    // yummy scrolling
    white-space: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-left: -$gutter-space / 2;
    margin-right: -$gutter-space / 2;
    padding-left: $gutter-space / 2;
    padding-right: $gutter-space / 2;

    &::-webkit-scrollbar { display: none; }

    @media ($screen-md) {
        margin: 0;
        padding: 0;
        white-space: normal;
        overflow: visible;
    }
}

//
// Footer Menu
//
.menu--footer {
    .grid__col {
        &:nth-child(2) {
            margin-top: $spacer;

            @media ($screen-sm) {
                margin-top: 0;
            }
        }
    }

    .menu__logo {
        margin-top: ($spacer / 3);
        margin-bottom: 0;

        svg {
            @media ($screen-sm) {
                margin: 0;
            }
        }
    }

    .menu__link {
        padding: ($spacer / 2);
        color: $gray-light;

        @media ($screen-sm) {
            display: block;
            text-align: left;
        }

        // hide link line
        &:after { display: none; }

        &:hover,
        &:focus,
        &.active { color: $brand-primary; }
    }
}


.footer__copyright {
    border-top: 1px solid $gray-dark;
    text-align: center;
    display: block;
    margin-top: ($spacer * 4);

    @media ($screen-sm) {
        text-align: left;
    }

    .menu__link {
        display: inline-block;
        text-transform: none;
        padding: ($spacer * 2) ($spacer/2);

        &:first-child { margin-left: ($spacer/2); }
        &:last-child { padding-right: 0; }
    }

    &,
    .menu__link {
        @extend .mini;
        color: $gray;
    }
}