.course-detail {
    padding: 1em;
    max-width: 75em;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2em;
}

.course-detail__hero {
    display: flex;
    flex-direction: column;
    background-color: var(--whihte);
    border-radius: 0.5em;
    overflow: hidden;
    box-shadow: 0 0.25em 0.5em var(--philippine-silver);
}

.course-detail__hero__image {
    width: 100%;
}

.course-detail__hero__img {
    width: 100%;
    height: 12em;
    object-fit: cover;
}

.course-detail__hero__content {
    padding: 1.5em;
    display: flex;
    flex-direction: column;
    gap: 1.5em;
}

.course-detail__hero__title {
    font-size: 1.5em;
    font-weight: 700;
    color: var(--black);
    text-align: center;
    letter-spacing: 0.05em;
    margin: 0;
}

.course-detail__hero__info {
    display: flex;
    flex-direction: column;
    gap: 1em;
}

.course-detail__hero__item {
    display: flex;
    flex-direction: column;
    gap: 0.5em;
}

.course-detail__hero__label {
    font-weight: 600;
    font-size: 0.9em;
    color: var(--raw-umber);
    letter-spacing: 0.05em;
}

.course-detail__hero__value {
    font-weight: 500;
    font-size: 0.9em;
    color: var(--black);
    line-height: 1.4;
}

.course-detail__hero__actions {
    display: flex;
    flex-direction: column;
    gap: 1em;
    margin-top: 1em;
    align-self: center;
}

.course-detail__hero__btn {
    border: none;
    border-radius: 0.25em;
    padding: 1em 2em;
    font-weight: 700;
    font-size: 1em;
    letter-spacing: 0.05em;
    cursor: pointer;
    font-family: var(--alan-sans);
    transition: all 0.2s ease;
    text-decoration: none;
    text-align: center;
    display: inline-block;
}

.course-detail__hero__btn--primary {
    background-color: var(--auburn);
    color: var(--whihte);
}

.course-detail__hero__btn--primary:hover {
    background-color: var(--coral-red);
    transform: translateY(-0.0625em);
}

.course-detail__hero__btn--secondary {
    background-color: var(--antique-white);
    color: var(--black);
    border: 0.125em solid var(--air-force-blue);
}

.course-detail__hero__btn--secondary:hover {
    background-color: var(--air-force-blue);
    color: var(--whihte);
}

.course-detail__hero__btn--tertiary {
    background-color: var(--success-green);
    color: var(--whihte);
    border: none;
}

.course-detail__hero__btn--tertiary:hover {
    background-color: var(--dark-green);
    transform: translateY(-0.0625em);
}

.course-detail__content {
    display: flex;
    flex-direction: column;
    gap: 2em;
}

.course-detail__main {
    flex: 1;
}

.course-detail__section-title {
    font-size: 1.3em;
    font-weight: 700;
    color: var(--black);
    text-align: center;
    letter-spacing: 0.05em;
    margin-bottom: 1.5em;
}

.course-detail__curriculum__content {
    background-color: var(--whihte);
    border: 0.125em solid var(--air-force-blue);
    border-radius: 0.5em;
    overflow: hidden;
}

.course-detail__curriculum__intro {
    background-color: var(--air-force-blue);
    padding: 1em;
    text-align: center;
}

.course-detail__curriculum__intro-text {
    font-weight: 600;
    color: var(--black);
    font-size: 0.9em;
    letter-spacing: 0.05em;
}

.course-detail__curriculum__lesson {
    display: flex;
    align-items: center;
    padding: 1em;
    border-bottom: 0.0625em solid var(--philippine-silver);
    gap: 1em;
}

.course-detail__curriculum__lesson:last-child {
    border-bottom: none;
}

.course-detail__curriculum__lesson__icon {
    font-size: 1.2em;
    width: 1.5em;
    text-align: center;
    flex-shrink: 0;
}

.course-detail__curriculum__lesson__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25em;
}

.course-detail__curriculum__lesson__title {
    font-weight: 600;
    font-size: 0.9em;
    color: var(--black);
    line-height: 1.3;
}

.course-detail__curriculum__lesson__duration {
    font-size: 0.8em;
    color: var(--raw-umber);
    font-weight: 500;
}

.course-detail__curriculum__modules {
    display: flex;
    flex-direction: column;
}

.course-detail__curriculum__module {
    border-bottom: 0.0625em solid var(--philippine-silver);
}

.course-detail__curriculum__module:last-child {
    border-bottom: none;
}

.course-detail__curriculum__module__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1em;
    background-color: var(--antique-white);
    cursor: pointer;
    list-style: none;
}

.course-detail__curriculum__module__title {
    font-weight: 600;
    font-size: 0.9em;
    color: var(--black);
    letter-spacing: 0.05em;
}

.course-detail__curriculum__module__toggle {
    font-size: 0.8em;
    color: var(--raw-umber);
    transition: transform 0.2s ease;
}

.course-detail__curriculum__module[open] .course-detail__curriculum__module__toggle {
    transform: rotate(180deg);
}

.course-detail__curriculum__module__content {
    background-color: var(--whihte);
}

.course-detail__sidebar {
    display: flex;
    flex-direction: column;
    gap: 2em;
}

.course-detail__instructor__content {
    background-color: var(--whihte);
    border: 0.125em solid var(--air-force-blue);
    border-radius: 0.5em;
    padding: 1.5em;
    display: flex;
    flex-direction: column;
    gap: 1em;
    align-items: center;
    text-align: center;
}

.course-detail__instructor__avatar {
    flex-shrink: 0;
}

.course-detail__instructor__img {
    width: 5em;
    height: 5em;
    border-radius: 50%;
    object-fit: cover;
    border: 0.125em solid var(--air-force-blue);
}

.course-detail__instructor__info {
    display: flex;
    flex-direction: column;
    gap: 1em;
}

.course-detail__instructor__name {
    font-size: 1.1em;
    font-weight: 700;
    color: var(--black);
    letter-spacing: 0.05em;
    margin: 0;
}

.course-detail__instructor__rating {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5em;
}

.course-detail__instructor__stars {
    display: flex;
    gap: 0.2em;
}

.course-detail__instructor__star {
    font-size: 1.2em;
    color: var(--philippine-silver);
    transition: color 0.2s ease;
}

.course-detail__instructor__star--filled {
    color: var(--auburn);
}

.course-detail__instructor__rating-text {
    font-size: 0.8em;
    color: var(--raw-umber);
    font-weight: 500;
    text-align: center;
}

.course-detail__instructor__bio {
    font-size: 0.85em;
    color: var(--raw-umber);
    line-height: 1.5;
    margin: 0;
}

.course-detail__related {
    display: flex;
    flex-direction: column;
    gap: 1.5em;
}

.course-detail__related__list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5em;
    list-style: none;
}

.course-detail__related__item {
    width: 100%;
    max-width: 25em;
    margin: 0 auto;
}

.course-detail__related__card {
    display: flex;
    flex-direction: column;
    border: 0.125em solid var(--black);
    border-radius: 0.5em;
    padding: 1em;
    gap: 1em;
    background-color: var(--whihte);
    box-shadow: 0 0.25em 0.5em var(--philippine-silver);
    height: 100%;
    min-height: 15em;
}

.course-detail__related__card:hover {
    transform: translateY(-0.125em);
    box-shadow: 0 0.5em 1em var(--philippine-silver);
}

.course-detail__related__card__top {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 0.25em;
}

.course-detail__related__card__img {
    width: 100%;
    height: 8em;
    object-fit: cover;
}

.course-detail__related__card__tag {
    position: absolute;
    right: 0.5em;
    bottom: 0.5em;
    background-color: var(--black);
    padding: 0.5em;
    border-radius: 0.25em;
}

.course-detail__related__card__price {
    color: var(--whihte);
    font-weight: 700;
    font-size: 0.9em;
    letter-spacing: 0.05em;
}

.course-detail__related__card__content {
    display: flex;
    flex-direction: column;
    gap: 1em;
    flex: 1;
    justify-content: space-between;
}

.course-detail__related__card__info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1em;
}

.course-detail__related__card__duration {
    display: flex;
    align-items: baseline;
    gap: 0.25em;
}

.course-detail__related__card__duration__number {
    font-size: 1.5em;
    font-weight: 700;
    color: var(--black);
}

.course-detail__related__card__duration__text {
    font-weight: 600;
    font-size: 0.9em;
    color: var(--raw-umber);
}

.course-detail__related__card__details {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5em;
}

.course-detail__related__card__title {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--black);
    text-align: right;
    line-height: 1.2;
    margin: 0;
}

.course-detail__related__card__link {
    font-size: 0.85em;
    color: var(--air-force-blue);
    text-decoration: underline;
    font-weight: 500;
}

.course-detail__related__card__link:hover {
    color: var(--sky-blue);
}

.course-detail__related__card__actions {
    display: flex;
    justify-content: flex-end;
}

.course-detail__related__card__btn {
    background-color: var(--auburn);
    color: var(--whihte);
    padding: 0.75em 1.5em;
    border-radius: 0.25em;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9em;
    letter-spacing: 0.05em;
    cursor: pointer;
}

.course-detail__related__card__btn:hover {
    background-color: var(--coral-red);
}

@media screen and (min-width: 47em) {
    .course-detail {
        padding: 1.5em;
        gap: 2.5em;
    }

    .course-detail__hero {
        flex-direction: row;
    }

    .course-detail__hero__image {
        flex: 0 0 20em;
    }

    .course-detail__hero__img {
        height: 100%;
        min-height: 15em;
    }

    .course-detail__hero__content {
        flex: 1;
        padding: 2em;
        justify-content: center;
    }

    .course-detail__hero__title {
        font-size: 1.75em;
        text-align: left;
    }

    .course-detail__hero__item {
        flex-direction: row;
        align-items: flex-start;
        gap: 1em;
    }

    .course-detail__hero__label {
        flex: 0 0 8em;
        font-size: 1em;
    }

    .course-detail__hero__value {
        flex: 1;
        font-size: 1em;
    }

    .course-detail__hero__actions {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1em;
        align-self: flex-start;
    }

    .course-detail__hero__btn {
        font-size: 1.1em;
        flex: 0 1 auto;
    }

    .course-detail__content {
        flex-direction: column;
        gap: 2em;
    }

    .course-detail__main {
        flex: 1;
    }

    .course-detail__sidebar {
        flex: 1;
    }

    .course-detail__section-title {
        font-size: 1.4em;
        text-align: left;
    }

    .course-detail__curriculum__lesson__title {
        font-size: 1em;
    }

    .course-detail__curriculum__lesson__duration {
        font-size: 0.9em;
    }

    .course-detail__instructor__content {
        flex-direction: row;
        text-align: left;
        padding: 2em;
    }

    .course-detail__instructor__img {
        width: 6em;
        height: 6em;
    }

    .course-detail__instructor__name {
        font-size: 1.2em;
    }

    .course-detail__instructor__bio {
        font-size: 0.9em;
    }

    .course-detail__instructor__rating {
        align-items: flex-start;
    }

    .course-detail__instructor__rating-text {
        font-size: 0.85em;
        text-align: left;
    }

    .course-detail__instructor__star {
        font-size: 1.3em;
    }

    .course-detail__related__list {
        grid-template-columns: repeat(2, 1fr);
        gap: 2em;
    }

    .course-detail__related__item {
        max-width: none;
    }

    .course-detail__related__card {
        padding: 1.25em;
        gap: 1.25em;
        min-height: 18em;
    }

    .course-detail__related__card__title {
        font-size: 1.2em;
    }

    .course-detail__related__card__link {
        font-size: 0.9em;
    }

    .course-detail__related__card__btn {
        padding: 0.875em 1.75em;
        font-size: 1em;
    }

    .course-detail__related__card__img {
        height: 9em;
    }
}

@media screen and (min-width: 60em) {
    .course-detail {
        padding: 2em;
        gap: 3em;
    }

    .course-detail__content {
        flex-direction: column;
        gap: 3em;
    }

    .course-detail__main {
        flex: 1;
    }

    .course-detail__sidebar {
        flex: 1;
    }

    .course-detail__hero__image {
        flex: 0 0 25em;
    }

    .course-detail__hero__img {
        min-height: 18em;
    }

    .course-detail__hero__content {
        padding: 2.5em;
    }

    .course-detail__hero__title {
        font-size: 2em;
    }

    .course-detail__hero__label {
        flex: 0 0 10em;
        font-size: 1.1em;
    }

    .course-detail__hero__value {
        font-size: 1.1em;
    }

    .course-detail__hero__actions {
        gap: 1.5em;
    }

    .course-detail__hero__btn {
        font-size: 1.2em;
        padding: 1.2em 2.5em;
    }

    .course-detail__content {
        gap: 3em;
    }

    .course-detail__section-title {
        font-size: 1.5em;
    }

    .course-detail__curriculum__lesson {
        padding: 1.25em;
    }

    .course-detail__curriculum__lesson__title {
        font-size: 1.1em;
    }

    .course-detail__curriculum__lesson__duration {
        font-size: 1em;
    }

    .course-detail__curriculum__module__header {
        padding: 1.25em;
    }

    .course-detail__instructor__content {
        padding: 2.5em;
    }

    .course-detail__instructor__img {
        width: 7em;
        height: 7em;
    }

    .course-detail__instructor__name {
        font-size: 1.3em;
    }

    .course-detail__instructor__bio {
        font-size: 1em;
    }

    .course-detail__instructor__rating-text {
        font-size: 0.9em;
    }

    .course-detail__instructor__star {
        font-size: 1.4em;
    }

    .course-detail__related__list {
        grid-template-columns: repeat(4, 1fr);
        gap: 2.5em;
    }

    .course-detail__related__card {
        padding: 1.5em;
        gap: 1.5em;
        min-height: 20em;
    }

    .course-detail__related__card__duration__number {
        font-size: 1.75em;
    }

    .course-detail__related__card__duration__text {
        font-size: 1em;
    }

    .course-detail__related__card__title {
        font-size: 1.3em;
    }

    .course-detail__related__card__link {
        font-size: 1em;
    }

    .course-detail__related__card__btn {
        padding: 1em 2em;
        font-size: 1.1em;
    }

    .course-detail__related__card__img {
        height: 10em;
    }
}