* {
    padding: 0;
    margin: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

.fullscreen {
    display: block;
    width: 100%;
    margin: auto;
}

.fullscreen img {
    max-width: 100%;
}

@media screen and (min-width: 640px) {
    .fullscreen {
        width: 640px;
    }
}


.header-wrapper {
    position: relative;
    font-size: 0;
}

.header-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    display: flex;
    align-items: stretch;
    flex-direction: column;
    overflow: hidden;
    padding: 6.4rem 5rem;
    font-size: 1.6rem;
}

.list-item-wrapper {
    position: relative;
    font-size: 0;
}

.list-item {
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    display: flex;
    align-items: stretch;
    flex-direction: column;
    overflow: hidden;
    padding: 6.4rem 5rem;
    font-size: 1.6rem;
}

.list-item-wrapper-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    display: flex;
    align-items: stretch;
    flex-direction: column;
}

.list-item-wrapper-bg .top {
    height: 60rem;
    background: url(../image/2.jpg) no-repeat top center / cover;
}

.list-item-wrapper-bg .middle {
    flex: 1;
    background: url(../image/2-bg.jpg) repeat center center;
    background-size: 100%;
}

.list-item-wrapper-bg .bottom {
    height: 6rem;
    background: url(../image/2.jpg) no-repeat bottom center / cover;
}

.list-item .list-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.list-item-author {
    display: flex;
    align-items: center;
}

.list-item-author .author {
    width: 4rem;
    height: 4rem;
}

.list-item-author .name {
    margin-left: 2rem;
    font-size: 1.6rem;
    font-weight: bold;
}

.list-item .list-item-header-right {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.list-item .list-item-content {
    display: flex;
    align-items: center;
    flex-direction: column;
    margin-top: 2rem;
}

.list-item-content-text {
    width: 100%;
}

.list-item .list-item-content .text {
    width: 100%;
    text-align: justify;
    font-size: 1.8rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.list-item .list-item-content .check-text {
    color: cornflowerblue;
    font-weight: bold;
}

.list-item .list-item-content .item-video {
    width: 100%;
    height: 30rem;
    margin-top: 2rem;
}

.activity-title {
    position: absolute;
    left: 19rem;
    top: 62rem;
    width: 26.5rem;
    height: 7.5rem;
}

.activity-info {
    position: absolute;
    bottom: 12.2rem;
    left: 4rem;
    font-size: 1.6rem;
    white-space: nowrap;
}

.activity-info p {
    line-height: 1;
    margin-top: 5.5rem;
}

.activity-button-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    bottom: 3.6rem;
    left: 0;
    width: 100%;
    box-sizing: border-box;
    padding: 0 3rem 0 2rem;
}

.activity-button {
    width: 18.4rem;
    height: 5rem;
}

.activity-message {
    font-size: 1.6rem;
    line-height: 1.5;
    position: relative;
    width: 60rem;
}

.activity-message-bg {
    font-size: 0;
}

.activity-message-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    padding: 15rem 2rem 0rem 2rem;
    box-sizing: border-box;
}


.activity-message-close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    width: 4rem;
    height: 4rem;
    z-index: 2;
}

.dialog-video-tutorial {
    height: 30rem;
}

.dialog-redbook-tutorial {
    height: 30rem;
}