#opening {
    visibility: hidden;
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    background-color: #202020;
    z-index: 9999;
    -webkit-animation: openingAnimation 3s forwards;
    animation: openingAnimation 3s forwards;
}

#opening.show {
    visibility: visible;
}

.opening-logo {
    position: absolute;
    width: clamp(15rem, 8.112rem + 36.73vw, 37.5rem);
    max-width: 90%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    animation-delay: 0.2s;
}

@keyframes openingAnimation {
    70% {
        opacity: 1;
    }

    100% {
        visibility: hidden;
        opacity: 0;
        z-index: -1;
    }
}

.header__logo {
    visibility: hidden;
}

/*—————————————————————————————————
main-visual
—————————————————————————————————*/
.main-visual__inner {
    position: relative;
    z-index: var(--z-base);
    color: #fff;
    width: 100%;
    height: 100vh;
}

.main-visual__inner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(38, 50, 69, .35);
    z-index: 10;
}

.main-visual-slider {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
}

.main-visual-slider .image {
    width: 100%;
    height: 100vh;
}

.main-visual__wrap {
    position: absolute;
    bottom: 0;
    z-index: 10;
    width: 100%;
}

.main-visual__list {
    width: 90%;
    margin: 0 auto;
}

.main-visual__list__item__top {
    height: 60vh;
}

.main-visual__list__item .en {
    font-size: .625rem;
    letter-spacing: 0;
    font-family: var(--en-font);
}

.main-visual__list__item__title {
    font-size: 2rem;
    font-family: var(--en-font);
    letter-spacing: 0;
}

.main-visual__list__item__title .logo-image {
    max-width: 240px;
}

.main-visual__list__item__title .jp {
    display: block;
    font-size: .625rem;
    font-family: var(--jp-font);
}

.main-visual__list__item .jp-catch {
    font-size: clamp(0.938rem, 0.833rem + 0.52vw, 1.25rem);
}

.main-visual__list__item .en-catch {
    margin-top: 4px;
    font-size: .75rem;
    font-family: var(--en-font);
    letter-spacing: 0;
    line-height: 1.2em;
}

.main-visual__list__item__bottom {
    /* position: absolute;
    bottom: 60px; */
    display: flex;
    align-items: end;
    width: 100%;
    column-gap: 20px;
    margin-bottom: 40px;
    z-index: 10;
}

.main-visual__list__item__bottom .catch {
    flex: 1;
}

.main-visual__list__item__bottom .button__link {
    display: flex;
    align-items: baseline;
    width: 100%;
    padding: 6px 12px;
    max-width: 160px;
    border: 1px solid #fff;
    border-radius: 20px;
    color: #fff;
    font-family: var(--en-font);
}

.main-visual__list__item__bottom .button__link__text {
    position: relative;
    display: flex;
    font-size: 1rem;
    white-space: nowrap;
}

.main-visual__list__item__bottom .button__link__text::after {
    content: "";
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    padding-left: 28px;
    background: center / contain no-repeat url(../images/common/icon/header-online-link.svg);
}

@media screen and (min-width: 850px) {
    .main-visual__wrap {
        bottom: 4%;
        left: 8%;
    }

    .main-visual__list {
        display: flex;
        align-items: center;
        column-gap: clamp(2.5rem, -1.25rem + 7.81vw, 5rem);
        width: 100%;
        z-index: 10;
    }

    .main-visual__list__item__title .logo-image {
        width: 100%;
        max-width: 400px;
    }

    .main-visual__list__item .en-catch {
        margin-top: 32px;
        line-height: 1.5;
    }

    .main-visual__list__item__top {
        height: fit-content;
    }

    .main-visual__list__item__bottom {
        position: static;
        padding-left: clamp(2.5rem, -1.25rem + 7.81vw, 5rem);
        margin-bottom: 0;
        border-left: 1px solid rgba(243, 243, 243, .4);
    }

    .main-visual__list__item__bottom .button {
        display: none;
    }
}

/*—————————————————————————————————
concept
—————————————————————————————————*/
.concept {
    background-color: var(--main-bg);
    color: #fff;
}

.concept__catch {
    margin-top: 40px;
}

.concept__catch__heading {
    font-size: 1.25rem;
}

.concept__catch__heading .indent {
    border: .1px solid rgba(243, 243, 243, .6)
}

.concept__catch__text {
    margin-top: 20px;
    padding-left: 16px;
}

.concept .image {
    width: 100%;
    max-width: 600px;
    margin: 80px auto 0;
}

.concept__prof {
    margin-top: 40px;
}

.concept__prof__wrap {
    margin-top: 40px;
}

.concept__prof__name .jp {
    font-size: 1.25rem;
}

.concept__prof__name .en {
    margin-left: 20px;
    font-family: var(--en-font);
    font-size: .875rem;
}

.concept__prof__text {
    margin: 20px 0 0 16px;
}

.concept__catch__heading .pc-text {
    display: none;
}

@media screen and (min-width: 768px) {
    .concept__inner {
        width: 50%;
        padding: 80px 0;
        text-align: center;
    }

    .concept__catch__heading {
        margin-top: 60px;
    }

    .concept__catch__heading .sm-text {
        display: none;
    }

    .concept__catch__heading .pc-text {
        display: inline-block;
    }

    .concept__catch__text {
        margin-top: 60px;
        text-align: left;
    }

    .concept__prof__text {
        margin: 40px 0;
        text-align: left;
    }
}

/*—————————————————————————————————
news
—————————————————————————————————*/
.news .section__title:after {
    background-color: var(--main-text-color);
}

.news__list {
    margin-top: 32px;
}

.news__list__item {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    align-items: center;
    padding: 28px 0;
    border-top: 1px solid rgba(39, 52, 63, .15);
}

.news__list__item:last-of-type {
    border-bottom: 1px solid rgba(39, 52, 63, .15);
}

.news__list__item__content {
    font-family: var(--en-font);
}

.news__list__item__content .new {
    display: inline-block;
    margin-left: 8px;
    padding: 2px 8px;
    border-radius: 20px;
    background-color: #263245;
    color: #f3f3f3;
    letter-spacing: 0;
    font-size: .75rem;
}

.news__list__item__content .heading {
    margin-top: 16px;
    font-size: clamp(0.875rem, 0.833rem + 0.21vw, 1rem);
}

.news__list__item__content .category {
    margin-top: 8px;
    font-size: .75rem;
}

.news__list__item__content__link {
    position: relative;
    display: inline-block;
    margin-top: 20px;
}

.news__list__item__content__link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    height: .1px;
    width: 100%;
    background-color: var(--main-text-color);

}

.news__list__item__image {
    justify-self: end;
}

.news__list__item__image .image {
    aspect-ratio: 5 / 3;
    width: clamp(7.5rem, 5.833rem + 8.33vw, 12.5rem);
    height: 120px;
}

@media screen and (min-width: 768px) {
    .news__inner {
        width: 90%;
        margin: auto;
    }

    .news__list__item {
        max-width: 900px;
        display: flex;
        justify-content: space-between;
        margin: 0 0 0 auto;
        transition: .4s ease-out;
    }

    @media (any-hover: hover) {
        .news__list__item:hover .news__list__item__content__link:after {
            transition: all .3s;
            transform: scale(0, 1);
            transform-origin: right bottom;
        }
    }

    .news__list__item__content {
        display: flex;
        column-gap: 80px;
    }

    .news__list__item__content .new {
        margin-left: 16px;
        padding: 2px 12px;
    }

    .news__list__item__content__wrap .heading {
        margin-top: 0;
    }

    .news__list__item__content__link {
        margin-top: 40px;
    }
}

/*—————————————————————————————————
lesson
—————————————————————————————————*/
.l-container {
    background-color: var(--main-bg);
    color: #fff;
}

.lesson .section__heading {
    padding-top: 40px;
    border-top: 1px solid rgba(243, 243, 243, .4);
}

.lesson__list {
    margin-top: 40px;
}

.lesson__list__item {
    position: relative;
    padding: 24px 16px;
    border-left: 1px solid rgba(243, 243, 243, .4);
    border-right: 1px solid rgba(243, 243, 243, .4);
}

.lesson__list__item::before {
    content: "";
    position: absolute;
    top: 0;
    width: 100%;
    height: 1px;
    transform: translateX(-16px);
    background-color: rgba(243, 243, 243, .4);
}

.lesson__list__item:last-of-type::after {
    content: "";
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 1px;
    transform: translateX(-16px);
    background-color: rgba(243, 243, 243, .4);
}

.lesson__list__item__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    column-gap: 16px;
}

.lesson__list__item__image {
    width: 55%;
}

.lesson__list__item__image .image {
    aspect-ratio: 17/11;
}

.lesson__list__item__text {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-wrap: wrap;
    width: 45%;
}

.lesson__list__item__text .name {
    line-height: 1.5;
    margin-top: 40px;
    font-size: clamp(0.875rem, 0.833rem + 0.21vw, 1rem);
}

.lesson__list__item__text .number {
    font-size: 1.25rem;
    font-family: var(--en-font);
    text-align: right;
}

@media screen and (min-width: 768px) {
    .lesson__inner {
        width: 90%;
    }

    .lesson__list {
        max-width: 900px;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        margin: 60px 0 0 auto;
    }

    .lesson__list__item {
        flex-direction: column;
        padding: 24px 40px;
        border-top: .1px solid rgba(243, 243, 243, .4);
        border-right: none;
    }

    .lesson__list__item:first-of-type,
    .lesson__list__item:nth-of-type(4) {
        border-left: none;
    }

    .lesson__list__item:nth-of-type(n+4) {
        border-bottom: .1px solid rgba(243, 243, 243, .4);
    }

    .lesson__list__item__link {
        flex-direction: column;
    }

    .lesson__list__item__image {
        width: 100%;
    }

    .lesson__list__item__text {
        width: 100%;
        margin-top: 40px;
        flex-direction: row-reverse;
    }

    .lesson__list__item__text .name {
        margin-top: 0;
    }

    .lesson__list__item::before,
    .lesson__list__item:last-of-type::after {
        display: none;
    }

    .lesson__list__item__image .image {
        height: 132px;
    }
}

/*—————————————————————————————————
insta
—————————————————————————————————*/
.insta .section__heading {
    align-items: center;
}

.section__heading-insta {
    display: flex;
    column-gap: 8px;
}

.section__heading-insta .icon {
    width: 16px;
    object-fit: contain;
}

.insta__feed-list {
    width: 100%;
    margin: 40px auto 0;
}

@media screen and (min-width: 768px) {
    .insta__inner {
        width: 90%;
    }

    .insta__feed-list {
        max-width: 900px;
        margin: 60px 0 40px auto;
    }
}