.main {
    margin-top: 60px;
}

html,
body {
    height: 100%;
}

.section_content1 {
    position: relative;
    width: 100vw;
    height: calc(100vw * 9 / 16);
    overflow: hidden;
    margin: 0 auto;
}


.section_content1 video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}


.mobile-video-wrapper {
    display: none;
}


@media screen and (max-width: 768px) {

    .PC-video-wrapper {
        display: none;
    }

    .mobile-video-wrapper {
        display: block;
    }


    .section_content1 {
        height: calc(100vw * 16 / 9);
    }
}


@media screen and (min-width: 769px) {
    .PC-video-wrapper {
        display: block;
    }

    .mobile-video-wrapper {
        display: none;
    }
}





.section_content2 {
    width: 100dvw;
    height: 100dvh;
    background-color: transparent;
    background: #000;
    text-align: center;
    object-fit: cover;
    position: relative;

}

.block2 {
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    width: 25vw;
    height: auto;
    z-index: 10;

}




.circles2 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}



.circles2 li {
    position: absolute;

    list-style: none;
    width: 20px;
    height: 20px;

    animation: animate2 25s linear infinite;
    bottom: -200px;

}

.circles2 li:nth-child(1) {
    left: 5%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles2 li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles2 li:nth-child(3) {
    left: 15%;
    width: 10px;
    height: 10px;
    animation-delay: 18s;
}

.circles2 li:nth-child(4) {
    left: 30%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 38s;
}

.circles2 li:nth-child(5) {
    left: 35%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles2 li:nth-child(6) {
    left: 45%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles2 li:nth-child(7) {
    left: 55%;
    width: 120px;
    height: 120px;
    animation-delay: 7s;
}

.circles2 li:nth-child(8) {
    left: 60%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles2 li:nth-child(9) {
    left: 65%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles2 li:nth-child(10) {
    left: 70%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}

.circles2 li:nth-child(11) {
    left: 75%;
    width: 10px;
    height: 10px;
    animation-delay: 0s;
    animation-duration: 8s;
}

.circles2 li:nth-child(12) {
    left: 80%;
    width: 200px;
    height: 200px;
    animation-delay: 0s;
    animation-duration: 25s;
}











.section_content3 {
    width: 100dvw;
    height: 100dvh;
    background-color: transparent;
    text-align: center;
    object-fit: cover;
    position: relative;
}

.block3 {
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    width: 25vw;
    height: auto;
    z-index: 10;
}


.circles3 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}



.circles3 li {
    position: absolute;

    list-style: none;
    width: 20px;
    height: 20px;

    animation: animate1 25s linear infinite;
    bottom: -200px;

}

.circles3 li:nth-child(1) {
    left: 5%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles3 li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles3 li:nth-child(3) {
    left: 15%;
    width: 10px;
    height: 10px;
    animation-delay: 18s;
}

.circles3 li:nth-child(4) {
    left: 30%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 38s;
}

.circles3 li:nth-child(5) {
    left: 35%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles3 li:nth-child(6) {
    left: 45%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles3 li:nth-child(7) {
    left: 55%;
    width: 120px;
    height: 120px;
    animation-delay: 7s;
}

.circles3 li:nth-child(8) {
    left: 60%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles3 li:nth-child(9) {
    left: 65%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles3 li:nth-child(10) {
    left: 70%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}

.circles3 li:nth-child(11) {
    left: 75%;
    width: 10px;
    height: 10px;
    animation-delay: 0s;
    animation-duration: 8s;
}

.circles3 li:nth-child(12) {
    left: 80%;
    width: 200px;
    height: 200px;
    animation-delay: 0s;
    animation-duration: 25s;
}





.section_content4 {
    width: 100dvw;
    height: 100dvh;
    background-color: transparent;
    background-color: #000;
    text-align: center;
    object-fit: cover;
    position: relative;
}

.block4 {
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    width: 25svw;
    height: auto;
    z-index: 10;
}



.circles4 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}



.circles4 li {
    position: absolute;

    list-style: none;
    width: 20px;
    height: 20px;

    animation: animate2 25s linear infinite;
    bottom: -200px;

}

.circles4 li:nth-child(1) {
    left: 5%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles4 li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles4 li:nth-child(3) {
    left: 15%;
    width: 10px;
    height: 10px;
    animation-delay: 18s;
}

.circles4 li:nth-child(4) {
    left: 30%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 38s;
}

.circles4 li:nth-child(5) {
    left: 35%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles4 li:nth-child(6) {
    left: 45%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles4 li:nth-child(7) {
    left: 55%;
    width: 120px;
    height: 120px;
    animation-delay: 7s;
}

.circles4 li:nth-child(8) {
    left: 60%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles4 li:nth-child(9) {
    left: 65%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles4 li:nth-child(10) {
    left: 70%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}

.circles4 li:nth-child(11) {
    left: 75%;
    width: 10px;
    height: 10px;
    animation-delay: 0s;
    animation-duration: 8s;
}

.circles4 li:nth-child(12) {
    left: 80%;
    width: 200px;
    height: 200px;
    animation-delay: 0s;
    animation-duration: 25s;
}






.section_content5 {
    width: 100dvw;
    height: 100dvh;
    background-color: transparent;
    text-align: center;
    object-fit: cover;
    position: relative;
}

.block5 {
    position: absolute;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    width: 33vw;
    height: auto;
    z-index: 10;
}


.circles5 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}



.circles5 li {
    position: absolute;

    list-style: none;
    width: 20px;
    height: 20px;

    animation: animate1 25s linear infinite;
    bottom: -200px;

}

.circles5 li:nth-child(1) {
    left: 5%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}


.circles5 li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles5 li:nth-child(3) {
    left: 15%;
    width: 10px;
    height: 10px;
    animation-delay: 18s;
}

.circles5 li:nth-child(4) {
    left: 30%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 38s;
}

.circles5 li:nth-child(5) {
    left: 35%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles5 li:nth-child(6) {
    left: 45%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles5 li:nth-child(7) {
    left: 55%;
    width: 120px;
    height: 120px;
    animation-delay: 7s;
}

.circles5 li:nth-child(8) {
    left: 60%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles5 li:nth-child(9) {
    left: 65%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles5 li:nth-child(10) {
    left: 70%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}

.circles5 li:nth-child(11) {
    left: 75%;
    width: 10px;
    height: 10px;
    animation-delay: 0s;
    animation-duration: 8s;
}

.circles5 li:nth-child(12) {
    left: 80%;
    width: 200px;
    height: 200px;
    animation-delay: 0s;
    animation-duration: 25s;
}





@keyframes animate1 {

    0% {
        transform: translateY(0) rotate(0deg) scale(0.1);
        opacity: 1;
    }

    100% {
        transform: translateY(-1000px) rotate(360deg) scale(0.5);
        opacity: 0;

    }

}

@keyframes animate2 {

    0% {
        transform: translateY(0) rotate(0deg) scale(0.1);
        opacity: 1;
    }

    100% {
        transform: translateY(-1000px) rotate(-360deg) scale(0.5);
        opacity: 0;

    }

}