ycb.vn/assets/styles/_menus.scss

/* ## Menus
--------------------------------------------- */

.menu {
    width: 100%;
    font-family: $font-heading;
    font-weight: $bolder;
    font-size: 1.8rem;
    line-height: 1;
    text-align: center;
    text-transform: uppercase;
    display: flex;
    flex-wrap: wrap;
    @include clearfix;
    @include breakpoint(md) {
        text-align: left;
        font-size: 1.2rem;
    }
}

.menu-item {
    display: block;
    padding: 0.5em 0;
    width: 100%;
    position: relative;
    @include breakpoint(md) {
        display: inline-block;
        padding: 0;
        width: auto;
    }
    &.right {
        margin-left: auto;
    }
    &:hover,
    &:focus,
    &.sfHover {
        outline: none;
        >.sub-menu {
            @include breakpoint(md) {
                opacity: 1 !important;
                margin-top: -1em;
                pointer-events: all;
            }
        }
        .sub-menu & {
            .sub-menu {
                margin-top: -1em;
            }
        }
    }
    a {
        width: auto;
        text-decoration: none;
        display: inline-block;
        padding: 0.5em 0;
        color: $border;
        @include breakpoint(md) {
            padding: 1.6em 1em;
            width: 100%;
        }
        @include breakpoint(lg) {
            padding: 3em 1.25em;
        }
        &:focus {
            outline: none;
        }
        span {
            position: relative;
        }
    }
    a:hover,
    a:focus,
    &.current-menu-item>a {
        color: $white;
        span {
            &:after {
                width: 100%;
            }
        }
        .sub-menu & {
            color: $gray;
        }
    }
}


/* ## Sub Menus
--------------------------------------------- */

.sub-menu {
    display: none;
    font-size: 1.4rem;
    padding: 1em 0;
    @include clearfix;
    @include breakpoint(md) {
        position: absolute;
        width: 18rem;
        z-index: 99;
        border-radius: $site-radius;
        background-color: $white;
        padding: 0.618em 0.5em;
        margin: 0;
        font-size: 1.2rem;
        display: block !important;
        opacity: 0 !important;
        transition: all .25s ease-in-out;
        pointer-events: none;
        box-shadow: 0 0.5rem 1.5rem rgba($dark,0.05);
        &:before {
            content: '';
            display: block;
            position: absolute;
            top: -1rem;
            left: 3rem;
            border: 0.5rem solid transparent;
            border-bottom-color: $white; 
        }
    }
    li {
        width: 100%;
        &:first-of-type {
            margin-top: 0.5em; // Slide toggle fix.
            @include breakpoint(md) {
                margin-top: 0;
            }
            a {
                padding-left: 1em;
            }
        }
    }
    a {
        padding-left: 1em;
        @include breakpoint(md) {
            padding: 1em;
            position: relative;
            word-wrap: break-word;
            color: $dark;
        }
        @include breakpoint(lg) {
            padding: 1em;
        }
    }
    .sub-menu {
        padding-left: 1em;
        @include breakpoint(md) {
            margin: 0 0 0 18.2rem;
            padding-left: 0.5em;
            left: 0;
            top: 0;
        }
        &:before {
            @include breakpoint(md) {
                position: absolute;
                top: 2em;
                left: -1rem;
                border: 0.5rem solid transparent;
                border-right-color: $white; 
            }
        }
    }
}


/* ## Specific Menus
--------------------------------------------- */

.nav-primary {
    width: 100vw;
    margin: auto;
    padding: 5vw;
    background-color: rgba($dark,0.98);
    border-top: $site-border;
    border-bottom: $site-border;
    position: fixed;
    overflow: auto;
    overflow-x: visible;
    -webkit-overflow-scrolling: touch;
    left: 5vw;
    top: -1rem;
    left: -1rem;
    right: -1rem;
    bottom: -1rem;
    display: none;
    @include breakpoint(md) {
        background-color: transparent;
        border: none;
        position: relative;
        top: auto;
        left: auto;
        right: auto;
        bottom: auto;
        width: auto;
        display: block;
        margin: 0;
        padding: 0;
        overflow: initial;
        -webkit-overflow-scrolling: initial;
    }
    &.visible {
        display: block;
    }
    .no-js & {
        width: 100%;
        position: relative;
        display: block;
        @include breakpoint(md) {
            display: block;
            width: auto;
        }
        .wrap {
            padding: 0 5%;
        }
        .menu-item {
            display: inline-block;
            width: auto;
            margin: 0 0.5em;
        }
    }
    .wrap {
        height: 100%;
    }
    .menu {
        min-height: 100%;
        padding: 0 0 1em;
        flex-direction: column;
        justify-content: center;
        @include breakpoint(md) {
            padding: 0;
            flex-direction: row;
            justify-content: flex-end;
            padding: 0;
        }
    }
}


/* ## Menu Toggles
--------------------------------------------- */

.menu-toggle {
    padding: 2.7rem 0;
    cursor: pointer;
    background-color: transparent;
    display: block;
    position: absolute;
    right: 5vw;
    top: 0;
    line-height: 1;
    color: transparent;
    letter-spacing: -0.5em;
    z-index: 999;
    
    @include breakpoint(md) {
        display: none;
    }
    &:hover,
    &:focus {
        background: none;
        outline: none;
        box-shadow: none;
        color: transparent;
    }
    &.activated {
        position: fixed;
    }    
    span {
        display: block;
        float: right;
        position: relative;
        height: 0.2rem;
        background: $white;
        transition: background 0s 0.2s;
        width: 2.5rem;
        margin-left: 0.236em;
        margin-top: 0.7rem;
        border-radius: $site-radius;
        &::before,
        &::after {
            position: absolute;
            display: block;
            left: 0;
            width: 100%;
            height: 0.2rem;
            background-color: $white;
            border-radius: $site-radius;
            content: " ";
        }
        &::before {
            top: -0.7rem;
            transition: top 0.2s 0.2s, transform 0.2s 0s;
        }
        &::after {
            bottom: -0.7rem;
            transition: bottom 0.2s 0.2s, transform 0.2s 0s;
        }
    }
    &.activated span {
        background: none;
        &::before {
            top: 0;
            transform: rotate(45deg);
            transition: top 0.2s 0s, transform 0.2s 0.2s;
        }
        &::after {
            bottom: 0;
            transform: rotate(-45deg);
            transition: bottom 0.2s 0s, transform 0.2s 0.2s;
        }
    }
}

.sub-menu-toggle {
    position: absolute;
    background-color: transparent;
    padding: 0.75em;
    margin: 0 -1em 0 1em;
    @include breakpoint(md) {
        display: none;
    }
    &:hover,
    &:focus {
        background: none;
    }
    &:before {
        content: "";
        display: block;
        margin: 0.2rem 0 -0.2rem;
        border: 0.4rem solid transparent;
        border-top-color: $light;
    }
    &.activated {
        &:before {
            transform: rotate(180deg);
            margin: -0.2rem 0 0.2rem;
        }
    }
}