.index-page {
    min-height: calc(100vh - 70px);
    background: #FFF;
}
.index-main {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-direction: column;
}
.first-section {
    min-height: calc(100vh - 60px);
    width: 100%;
    position: relative;
}
.mask {
    background-image: radial-gradient(farthest-corner at center 0,#fff 0,#fff 40%,hsla(0,0%,100%,0) 81%,hsla(0,0%,100%,0) 100%);
    left: -150%;
    right: -150%;
    bottom: 0;
    position: absolute;
    top: 0;
}
.top-block {
    margin-top:50px;
    height: calc(100% - 180px);
}
.site-slogan {
    font-size: 45px;
    font-family: "Microsoft YaHei", "微软雅黑", Helvetica, Tahoma, STXihei, "华文细黑", STHeiti, "Helvetica Neue", Helvetica, Tahoma, "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, "宋体", Heiti, "黑体", sans-serif;
    color: #333;
    font-weight: 900;
}
.site-desc {
    font-size: 25px;
    font-family: "Microsoft YaHei", "微软雅黑", Helvetica, Tahoma, STXihei, "华文细黑", STHeiti, "Helvetica Neue", Helvetica, Tahoma, "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, "宋体", Heiti, "黑体", sans-serif;
    color: #333;
    font-weight: 300;
    margin-top: 20px;
    max-width: 1000px;
}
.site-desc-display {
    white-space: nowrap;
    border-right: 1px solid;
    width: 0px;
    animation: w 4s steps(50) forwards,
    blink 0.3s steps(1) infinite;
    overflow : hidden;
}
@keyframes w{
    0%{
        width: 0;
    }
    100%{
        width: 100%;
    }
}

@keyframes blink
{
    50%{
        border-color: transparent;
    }
}

.site-btn {
    margin-top: 150px;
}
.use-btn-tip {
    margin-top:15px;
    color: #efefef;
    font-size: 12px;
}
.model-list {
    margin-top: 40px;
    width: 1000px;
}
.model-item {
    width: 80px;
    margin:5px;
    height: 80px;
    border-radius: 25px;
    background: #FFF;
}
.model-icon {
    width: 70px;
    height: 70px;
}
/* 闪光按钮 */
.use-btn {
    width: 250px;
    height: 50px;
    border: none;
    color: white;
    font-weight: 600;
    font-size: 13.5px;
    position: relative;
    overflow: hidden;
    border-radius: 40px;
    cursor: pointer;
    background: linear-gradient(-45deg, #6bc5f8, #cf59e6, #6bc5f8, #cf59e6);
    background-size: 1000% 1000%;
    animation: gradient 5s ease infinite;
    box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.247);
    transition-duration: .1s;
}
/* Button's gradient animation */
@keyframes gradient {
    0% {
        background-position: 0 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0 50%;
    }
}
/* Effect on Hover*/
.use-btn::before {
    content: "";
    position: absolute;
    width: 50px;
    height: 100%;
    left: -70px;
    top: 0;
    background-color: rgba(214, 199, 255, 0.329);
    filter: blur(10px);
    transition-duration: .3s;
    border-top-left-radius: 50%;
    border-bottom-right-radius: 50%;
}

.use-btn:hover::before {
    transform: translateX(250px);
    transition-duration: .3s;
}
/* Effect on click */
.use-btn:active {
    transform: translate(2px,2px);
    transition-duration: .1s;
}

/* 首页左上角标题文字 logo */
/* === removing default .logo-btn style ===*/
.logo-btn {
    font-size: 18px;
    color: #FFF;
    font-family:"Microsoft YaHei", "微软雅黑", Helvetica, Tahoma, STXihei, "华文细黑", STHeiti, "Helvetica Neue", Helvetica, Tahoma, "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, "宋体", Heiti, "黑体", sans-serif;
    font-weight: 800;
    cursor: pointer;
    position: relative;
    border: none;
    background: none;
    text-transform: uppercase;
    transition-timing-function: cubic-bezier(0.25, 0.8, 0.25, 1);
    transition-duration: 400ms;
    transition-property: color;
}

.logo-btn:focus,
.logo-btn:hover {
    color: #fff;
}

.logo-btn:focus:after,
.logo-btn:hover:after {
    width: 100%;
    left: 0%;
}

.logo-btn:after {
    content: "";
    pointer-events: none;
    bottom: -2px;
    left: 50%;
    position: absolute;
    width: 0%;
    height: 2px;
    background-color: #fff;
    transition-timing-function: cubic-bezier(0.25, 0.8, 0.25, 1);
    transition-duration: 400ms;
    transition-property: width, left;
}

.copyright {
    position: absolute;
    bottom: 20px;
    color: #efefef;
    font-size: 12px;
}

/* loading文字效果 */
.model-text {
    margin-top:20px;
}
.loader {
    color: #333;
    font-family:"Microsoft YaHei", "微软雅黑", Helvetica, Tahoma, STXihei, "华文细黑", STHeiti, "Helvetica Neue", Helvetica, Tahoma, "Droid Sans", "wenquanyi micro hei", FreeSans, Arimo, Arial, SimSun, "宋体", Heiti, "黑体", sans-serif;
    font-weight: 500;
    font-size: 25px;
    -webkit-box-sizing: content-box;
    box-sizing: content-box;
    height: 40px;
    padding: 10px 10px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    border-radius: 8px;
}

.words {
    overflow: hidden;
}

.word {
    margin-left: 10px;
    display: block;
    letter-spacing: 10px;
    height: 100%;
    padding-left: 6px;
    color: #FFC200;
    font-size: 25px;
    font-weight: 700;
    animation: spin_4991 8s infinite;
}

@keyframes spin_4991 {
    10% {
        -webkit-transform: translateY(-105%);
        transform: translateY(-105%);
    }

    25% {
        -webkit-transform: translateY(-100%);
        transform: translateY(-100%);
    }

    35% {
        -webkit-transform: translateY(-205%);
        transform: translateY(-205%);
    }

    50% {
        -webkit-transform: translateY(-200%);
        transform: translateY(-200%);
    }

    60% {
        -webkit-transform: translateY(-305%);
        transform: translateY(-305%);
    }

    75% {
        -webkit-transform: translateY(-300%);
        transform: translateY(-300%);
    }

    85% {
        -webkit-transform: translateY(-405%);
        transform: translateY(-405%);
    }

    100% {
        -webkit-transform: translateY(-400%);
        transform: translateY(-400%);
    }
}