/* 主区域 */
* {
    box-sizing: border-box;
}

.main {
    width: 100%;
    padding: 10vw 60px;
}

.main .con {
    display: none;
}

.main .con.show {
    display: block !important;
}

.education .conhead{
    font-size: 60px;
    font-weight: bold;
    border-top: 7px solid #342762;
    border-bottom: 7px solid #342762;
    padding: 10px 0;
    text-align: center;
}

/* 主内容 */
.education {
    width: 76%;
    display: flex;
    flex-direction: column;
    gap: 5vw;
}

.edu {
    aspect-ratio: 110 / 63;
    max-width: 1100px;
    border-radius: 40px;
    box-shadow: rgb(227 218 243) 2px 2px 10px 10px;
    overflow: hidden;
    position: relative;
}

.edu .front,
.edu .back {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background-color: #fff;
    backface-visibility: hidden;
    transition: opacity 1s, clip-path 1.5s;
}

.edu .back {
    clip-path: circle(0% at 0% 100%);
    z-index: 2;
    pointer-events: none;
}

.edu .front .logo {
    position: absolute;
    width: 9%;
    aspect-ratio: 1;
    border-radius: 50%;
    box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.6);
    top: 5%;
    right: 3%;
    z-index: 4;
    display: grid;
    place-items: center;
    animation: spin 5s linear infinite;
}

.edu .front .logo img {
    width: 75%;
    object-fit: contain;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.edu .front .photo {
    position: absolute;
    width: 85.5%;
    aspect-ratio: 2 / 1;
    left: 7%;
    top: 12%;
    border-radius: 40px;
}

.edu .front .photo img {
    width: 100%;
    height: 100%;
    display: block;
    border-radius: 40px;
    z-index: 2;
    position: relative;
}

.edu .front .time,
.edu .front .head {
    position: absolute;
    border-radius: 50px;
    display: grid;
    place-items: center;
    top: 3%;
    font-size: 1.7vw;
}

.edu.eth .front .head{
    width: 65%;
    left: 15%;
}

.edu .front .time {
    left: 10%;
}

.edu .front .head {
    left: 51%;
    width: 34%;
}

.edu .front .video {
    position: absolute;
    border-radius: 25px;
    box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.6);
    z-index: 4;
    width: 18%;
    aspect-ratio: 7 / 4;
    right: 1%;
    bottom: 7%;
    overflow: hidden;
    min-width: 110px;
}

.video video {
    position: absolute;
    z-index: 5;
    width: 100%;
}

.edu .front .b1 {
    position: absolute;
    background-color: #fff;
    z-index: 3;
    width: 10.6%;
    aspect-ratio: 2 / 1;
    right: 4%;
    bottom: 8%;
    border-top-left-radius: 40px;
}

.edu .front .b1::before,
.edu .front .b1::after {
    content: "";
    position: absolute;
    width: 40%;
    aspect-ratio: 1;
    background-color: transparent;
    border-bottom-right-radius: 30px;
    box-shadow: 50px 50px 0 50px #fff;
}

.edu .front .b1::before {
    top: -79%;
    right: -40%;
}

.edu .front .b1::after {
    bottom: -73%;
    left: -40%;
}

.edu .front .b2 {
    position: absolute;
    left: -1px;
    bottom: -1px;
    background-color: #fff;
    border-radius: 40px;
    width: 22.5%;
    aspect-ratio: 7 / 4;
    z-index: 3;
}

.edu .front .b2::before,
.edu .front .b2::after {
    content: "";
    position: absolute;
    width: 19%;
    aspect-ratio: 1;
    background-color: transparent;
    border-bottom-left-radius: 40px;
    box-shadow: -50px 50px 0 50px #fff;
}

.edu .front .b2::before {
    left: .5%;
    top: -33%;
}

.edu .front .b2::after {
    right: -19%;
    bottom: 1%;
}

.edu .front .b3 {
    position: absolute;
    top: -7%;
    right: -3.5%;
    background-color: #fff;
    border-radius: 40%;
    width: 10.6%;
    aspect-ratio: 1;
    z-index: 3;
}

.edu .front .b3::before,
.edu .front .b3::after {
    content: "";
    position: absolute;
    width: 30%;
    aspect-ratio: 1;
    background-color: transparent;
    border-top-right-radius: 30px;
    box-shadow: 50px -50px 0 50px #fff;
}

.edu .front .b3::before {
    top: 32%;
    left: -30%;
}

.edu .front .b3::after {
    bottom: -30%;
    right: 33%;
}

.edu .front .word {
    position: absolute;
    width: 45%;
    bottom: 4%;
    left: 30%;
    font-size: 1vw;
}

.edu .back .content {
    width: 100%;
    height: 100%;
    padding: 4% 6%;
    line-height: 2;
    overflow-y: scroll;
    text-align: justify;
}

.edu .back .content .lit-head,
.edu .back .content .h1 {
    margin: 20px auto;
}

.edu .back .content .lit-head{
    font-size: 1.6vw;
}

.edu .back .content .h1{
    font-size: 3vw;
}

.edu .back .content .intro {
    margin: 10px auto;
    font-size: 1vw;
}

.edu .back .content .m-img {
    width: 70%;
    margin: 20px auto;
}

.edu .back .content .m-img img {
    width: 100%;
    object-fit: cover;
    display: block;
    border-radius: 10px
}

.content .pdf {
    width: 90%;
    aspect-ratio: 8 / 5;
    margin: 0 auto;
    margin-top: 50px;
}

.content .pdf iframe {
    width: 100%;
    height: 100%;
}

.edu button {
    position: absolute;
    cursor: pointer;
    z-index: 4;
}

.edu button.more {
    width: 13%;
    top: 73%;
    left: 9%;
    transition: top .3s;
}

.edu button.more p {
    font-size: 1.5vw;
    font-weight: bold;
}

.edu button.more p strong {
    font-size: 1.5vw;
    font-weight: bolder;
}

.edu button.more span {
    position: absolute;
    top: 2%;
    left: 92%;
    font-size: 3vw;
}

.edu button.return {
    bottom: 5%;
    left: 5%;
}

.edu button.return span {
    font-size: 3vw;
}

.edu.open4 .front {
    pointer-events: none;
    opacity: 0;
}

.edu.open4 .back {
    clip-path: circle(100% at 30% 70%);
    pointer-events: auto;
}

@media (max-width: 1400px) {
    .main .menu{
        display: none;
    }
    .main .education{
        float: none;
        margin: 0 auto;
    }
}

@media (max-width: 900px) {
    .b1, .b2, .b3 {
        display: none;
    }
    .edu .front .more {
        top: 89%;
    }
}

@media (max-width: 750px) {
    .back .intro{
        font-size: 9px !important;
    }

    .back .lit-head{
        font-size: 13px !important;
    }
    .back h1{
        font-size: 15px !important;
    }
}