.header {
    background: var(--background);
    height: 1325px;
    width: 100%;
    text-align: center;
}

.header .logo {
    width: 100px;
    margin-top: 50px;
}

.header .desc {
    color: #fff;
    font-size: 23px;
    line-height: 47px;
    margin-top: 10px;
    margin-bottom: 40px;
    font-family: "title";
}

.header .banner_img {
    width: 100%;
}

.header .desc_tips {
    width: 915px;
    margin: 0 auto;
    font-family: "desc";
    font-size: var(--decSize);
    color: #fff;
    font-weight: 100;
    line-height: 36px;
    margin-bottom: 25px;
}

.header .down {
    width: 120px;
    height: 42px;
    text-align: center;
    background: #4072e1;
    color: #fff;
    line-height: 42px;
    border-radius: 25px;
    margin: 0 auto;
    cursor: pointer;
    margin-bottom: 15px;
}

.header .support {
    font-size: 12px;
    color: #b1b1b1;
    font-weight: 100;
}

.content .item {

}

.item .title {
    font-size: var(--titleSize);
    color: #000;
    font-weight: 600;
    font-family: "title";
    line-height: 68px;
    margin-bottom: 20px;
}

.item .desc {
    font-size: var(--decSize);
    color: #000;
    font-weight: 100;
    font-family: "desc";
    margin-bottom: 20px;
    line-height: 34px;
}

.item .demonstration {
    width: 100%;
    position: relative;
    background: url("../img/item_back.png");
    background-size: cover;
    height: 683px;
    left: -112px;
}

.item .demonstration video {
    width: 940px;
    height: 590px;
    position: absolute;
    left: 129px;
    top: 37px;
}

.base {
    background: linear-gradient(484deg, rgba(139, 95, 224, 1) 0%, rgba(104, 159, 232, 1) 100%);
}

.base .title,
.base .desc,
.theme .desc,
.tray .title,
.tray .desc{
    color: #fff;
}

.core .title {
    color: #eb1d4e;
}

.core .demonstration {
    background: url("../img/core_back.png");
    background-size: cover;
    left: -50px;
    height: 1007px;
}

.core video {
    width: 96% !important;
    height: 647px !important;
    left: 33px !important;
    object-fit: fill;
}

.theme {
    background: #1a1a1a;
}


.theme .title {
    color: #4cb050 !important;
    text-shadow: 238px -64px 2px #2c2b2bb3;
}

.theme .title span {
    color: #b45dc3 !important;
}

.theme .demonstration {
    background: url("../img/theme.png");
    background-size: cover;
    left: -50px;
}

.theme .padding {
    padding-bottom: 0 !important;
}

.tray {
    background: var(--background);
}
.tray .demonstration {
    background: url("../img/tray.png");
    background-size: contain;
    left: -50px;
    width: 71.6% !important;
}

.contact {
    background: #efefef;
}
.contact ul {
    margin-top: 12px;
    padding-left: 15px;
}
.contact ul li {
    margin-bottom: 10px;
    font-size: 16px;
    font-family: "desc";
}