.lesson-header {
    background: #fff;
}
.lesson-header .main-navigation,
.lesson-header .lesson-dropdown-menu-container {
    box-shadow: var(--shadow-shallow);
}
.main-navigation .logo-link {
    width: 3.75rem;
    height: 3.75rem;
}
.lesson-title i {
    background: var(--color-dark-tint-900);
    border-radius: 50%;
    color: #fff;
    padding: 4px 5px;
    font-size: 1rem;
}

.lesson__hero {
    aspect-ratio: 12 / 7;
    overflow: hidden;
}
.lesson__hero .video-container,
.lesson__hero .image-container {
    height: 100%;
}
.lesson__hero iframe {
    width: 100%;
    height: 100%;
}

.lesson__content {
    max-width: 1140px;
    width: 100%;
    margin: 0 auto;
    line-height: 1.8;
}
.lesson__body {
    background: #fff;
}
.lesson__content img {
    max-width: 100%;
    height: fit-content;
    object-fit: contain;
}

.menuWrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--margin-extra-small);
}
.menuWrapper label {
    position: absolute;
    left: 0;
    top: 0;
    margin-left: var(--margin-small);
    font-size: var(--font-size-small);
    transform: translateX(calc(-1 * var(--padding-tiny))) translateY(-50%);
    background: #fff;
}
.menuWrapper .material-menu {
    min-width: 14rem;
}
.menuWrapper .material-menu.static {
    width: 9rem;
    min-width: auto;
}
.menuWrapper .material-menu {
    position: relative;
    display: flex;
    justify-content: space-between;
    width: fit-content;
    height: fit-content;
    padding: var(--padding-small);
    border: 1px solid;
}
.menuWrapper .material-menu p,
.menuWrapper .material-menu i {
    line-height: 1;
    height: fit-content;
}
.menuWrapper .material-menu i {
    transition: 0.3s ease;
}
.menuWrapper .material-menu i.rotate {
    transform: rotate(180deg);
}
.menuWrapper .options-menu {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    padding: var(--padding-medium);
    transition: 0.4s ease-in-out;
    box-shadow: var(--shadow-deep);
    min-width: 24rem;
}
.menuWrapper .options-menu.show {
    visibility: visible;
    opacity: 1;
}

.lesson-groups-container {
    gap: var(--gap-xxl);
}

.lesson-dropdown-menu-container .list-header {
    background: var(--color-tertiary-tint-50);
    border-radius: 100px;
    padding: 0.1875rem 0.75rem;
    font-size: 0.875rem;
    width: fit-content;
}
.lesson-dropdown-menu-container .list-group-item {
    line-height: 1.5;
    padding: 0.25rem 1.25rem 0.25rem 0;
}

.lesson-content .video-container iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
}

/* Term explanation */
.lesson-content .term-explanation-term {
    position: relative;
    border-bottom: 1px dashed var(--color-primary);
    text-decoration: none;
}
.lesson-content .term-explanation-term .term-explanation-content {
    display: none;
}
.lesson-content .term-explanation-term:hover .term-explanation-content,
.lesson-content .term-explanation-term.active .term-explanation-content {
    display: block;
    position: absolute;
    top: 1.5rem;
    left: 100px;
    margin-left: -100px;
    width: 16.25rem;
    background: #fff;
    font-size: 0.8125rem;
    color: var(--color-dark-tint-900);
    z-index: 90;
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-deep);
    line-height: 1.25rem;
    padding: 0.625rem 0.75rem;
}
.lesson-content .term-explanation-term .term-explanation-content:before {
    content: '';
    position: absolute;
    width: 0.625rem;
    height: 0.625rem;
    top: -7px;
    left: 20px;
    background: #fff;
    transform: rotate(45deg);
    border-top: inherit;
    border-left: inherit;
}

.lesson-content .alignright {
    position: relative;
    z-index: 1;
    float: right;
    margin: 1rem;
}

.footerNavigation a {
    position: relative;
    display: block;
    background-size: cover;
    background-position: center center;
    color: #fff;
    box-shadow: var(--shadow-shallow);
    font-weight: bold;
    text-decoration: none;;
}
.footerNavigation a:before {
    position: absolute;
    content: '';
    display: block;
    background: rgba(0, 0, 0, 0.4);
    inset: 0;
    z-index: 1;
}
.footerNavigation a:hover:before {
    background: rgba(0, 0, 0, 0.1);
}
.footerNavigation a .routingText {
    opacity: 0.9;
    text-transform: uppercase;
    display: block;
}
.footerNavigation a .routingTitle {
    font-size: 120%;
}
.footerNavigation a span {
    position: relative;
    z-index: 2;
}



.back-to-top {
    position: fixed;
    bottom: 5%;
    left: 1.5%;
    z-index: 999;
    background-color: #000000;
    color: #fff !important;
    width: 45px;
    height: 45px;
    text-align: center;
    line-height: 50px;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    cursor: pointer;
}