.c-timeline {
    position: relative;
    padding: 8rem 2rem 4rem;
    background-position: center;
    background-size: cover;
}

.c-timeline__overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* background gradient darker on the left transitioning to transparent */
    background: linear-gradient(to right, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0) 100%);
}

.c-timeline__title-container {
    position: absolute;
    display: flex;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: column;
    text-align: center;
}

.c-timeline__title-container span {
    position: absolute;
    top: -35px;
    display: block;
    padding: 0.25rem 0.5rem;
    background-color: var(--primary, #000);
    color: var(--secondary, #fff);
    left: 50%;
    transform: translate(-50%, -100%);
}

.c-timeline__title-container h2 {
    margin: 0;
    background-color: var(--background, #fff);
    display: block;
    transform: translateY(-20%);
    padding: 0.375rem 0.625rem;
}

.c-timeline__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 100rem;
    margin: 0 auto;
}

.c-timeline__list-item {

}

.c-timeline__list-item-title  {
    max-height: 0;
    overflow: hidden;
    padding: 0;
    margin: 0;
    max-width: 16ch;
    font-size: 2.25rem;
}

.c-timeline__list-item-title span {
    background: var(--background, #fff);
    padding: 0.1rem 0.5rem 0.1rem 0;
    border-left: 0.625rem solid var(--background, #fff);
    -webkit-box-decoration-break: clone;
    -moz-box-decoration-break: clone;
    box-decoration-break: clone;
}

.c-timeline__content-text {
    margin-bottom: 1rem;
}

.c-timeline__list-item--active {

}

.c-timeline__selected-content {
    padding: 1.5rem;
    background: var(--background, #fff);
    align-self: start;
    position: relative;
    max-width: 25rem;
    justify-self: end;
}

.c-timeline__selected-content::before {
    content: '';
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--primary, #000);
    margin-bottom: 1rem;
}

.c-timeline__list {
    border-left: 3px solid white;
    padding-left: calc(2rem*var(--scale, 1));
    list-style-type: none;
    gap: 1rem;
}

.c-timeline__list-item {
    margin: 0;
    padding: 0;
}

.c-timeline__list-item button {
    color: white;
    border: none;
    font-size: calc(1rem*var(--scale, 1));
    padding-left: 4rem;
    transform: translateX(-3.95rem);
}

.c-timeline__list-item--active button {
    color: var(--secondary, #fff);
    background-color: var(--primary, #000);
}

.c-timeline__list-item--active button span {
    display: block;
    padding-left: 0.75rem;
}

.c-timeline__list li::before {
    display: none;
}

.c-timeline__list-item button::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    background: black;
    border-radius: 20rem;
    left: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: 300ms;
}

.c-timeline__list-item--active button::before {
    opacity: 1;
}

.c-timeline__list-container {
    position: relative;
    height: 40rem;
    overflow: hidden;
    padding-left: 1.5rem;
}

.c-timeline__list {
    position: absolute;
    top: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: 300ms;
}

.c-timeline__timeline-container {
    position: relative;
}

.c-timeline__up-button, .c-timeline__down-button {
    border-color: white;
    color: white;
    align-self: flex-start;
    position: absolute;
    left: 4rem;
    width: 3rem;
    height: 3rem;
}

.c-timeline__up-button {
    top: 0;
    z-index: 10;
}

.c-timeline__down-button {
    bottom: 0;
    z-index: 10;
}

:is(.c-timeline__up-button, .c-timeline__down-button) svg {
    width: 100%;
    height: 100%;
}

.c-timeline__up-button svg {
    transform: rotate(-90deg);
}

.c-timeline__down-button svg {
    transform: rotate(90deg);
}

.c-timeline__background-image-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.c-timeline__background-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: calc(100% - env(safe-area-inset-top) - env(safe-area-inset-bottom));
    transition: 500ms;
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
}

@media screen and (max-width: 768px) {
    .c-timeline__content {
        display: flex;
        flex-direction: column;
    }

    .c-timeline__selected-content {
        max-width: unset;
    }
}