hypothetical/resources/assets/sass/sections/_nav.scss

.nav-section-component {
    $logo-offset: 10px;
    $desktop-logo-width: 35px;
    $mobile-logo-width: 30px;
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;

    &-mobile-header {
        position: relative;
        width: 100%;
        height: $nav-height-mobile;
        background-color: $c-base;

        @media (min-width: $grid-float-breakpoint) {
            display: none;
        }

        &-toggle {
            position: absolute;
            top: 50%;
            right: ($grid-gutter-width / 2);
            transform: translateY(-50%);
            margin: 0px;
            width: 22px;
            height: 14px;
            padding: 0px;
            border: 0;
            border-radius: 0;
            cursor: pointer;

            &, &:hover, &:focus {
                background-color: transparent;
            }

            .icon-bar {
                position: absolute;
                left: 0px;
                margin: 0px;
                width: 100%;
                height: 2px;
                background-color: $c-text-light;
                transition: all 150ms;

                &:nth-child(1), &:nth-child(3) {
                    transform: translateY(0%) rotate(0deg);
                }

                &:nth-child(1) {
                    top: 0%;
                }

                &:nth-child(2) {
                    top: 50%;
                    transform: translateY(-50%);
                    opacity: 1;
                }

                &:nth-child(3) {
                    bottom: 0%;
                }
            }

            &.open .icon-bar {
                &:nth-child(1) {
                    top: 50%;
                    transform: translateY(-50%) rotate(45deg);
                }

                &:nth-child(2) {
                    opacity: 0;
                }

                &:nth-child(3) {
                    bottom: 50%;
                    transform: translateY(50%) rotate(-45deg);
                }
            }
        }
    }

    &-links {
        background-color: $c-base;
        opacity: 1;
        transition: max-height 500ms;

        @media (max-width: $grid-float-breakpoint-max) {
            overflow: hidden;
            z-index: 100;
            position: relative;
            max-height: ($nav-link-height-mobile * $nav-link-count);

            &:not(.open) {
                max-height: 0px;
            }
        }

        @media (min-width: $grid-float-breakpoint) {
            display: flex;
            width: 100%;
            height: $nav-height-desktop;
            justify-content: flex-end;
            align-items: center;
        }

        &-wrapper {
            @media (max-width: $grid-float-breakpoint-max) {
                overflow-y: auto;
                max-height: calc(100vh - #{$nav-height-mobile});
            }

            @media (min-width: $grid-float-breakpoint) {
                padding: 0px $grid-gutter-width 0px (($grid-gutter-width / 2) + $desktop-logo-width + $logo-offset);
            }

            .navlink {
                position: relative;
                display: inline-block;
                color: $c-text-light;
                font-size: 14px;
                text-transform: uppercase;

                @media (max-width: $grid-float-breakpoint-max) {
                    display: block;
                    height: $nav-link-height-mobile;
                    padding: 0px 10px;
                    background-color: $c-base;
                    line-height: $nav-link-height-mobile;
                    transition: background-color 150ms;

                    &:not(.active):hover {
                        background-color: lighten($c-base, 5%);
                    }
                }

                @media (min-width: $grid-float-breakpoint) {
                    padding: 5px 20px;
                    transition: color 150ms;

                    &:first-child {
                        padding-left: 0px;
                    }

                    &:last-child {
                        padding-right: 0px;
                    }

                    &:not(.active):hover {
                        @media (min-width: $grid-float-breakpoint) {
                            color: darken($c-text-light, 5%);
                        }
                    }
                }

                &:hover, &:focus {
                    text-decoration: none;
                }

                span {
                    position: relative;
                    padding: 3px 0px;

                    &:after {
                        content: "";
                        position: absolute;
                        bottom: 0px;
                        left: 0px;
                        width: 100%;
                        height: 1px;
                        background-color: $c-text-light;
                        opacity: 0;
                        transition: opacity 200ms;
                    }
                }

                &.active {
                    pointer-events: none;

                    span:after {
                        opacity: 1;
                    }
                }
            }
        }
    }

    &-logo {
        position: absolute;
        left: $logo-offset;
        transform: translateY(-50%);
        display: inline-block;
        width: $desktop-logo-width;

        @media (max-width: $grid-float-breakpoint-max) {
            top: ($nav-height-mobile / 2);
            width: $mobile-logo-width;
        }

        @media (min-width: $grid-float-breakpoint) {
            top: ($nav-height-desktop / 2);
        }

        img {
            @include img-responsive;
            width: 100%;
        }
    }
}