._scroll-anim-wrap{
    display: flex;
    flex-direction: column;
    overflow-anchor: none;
    width: 100%;
}
._scroll-anim-fixed > ._scroll-anim-content{
    position: fixed;
    width: 100%;
    top: 0;
}
._scroll-anim-leave > ._scroll-anim-content{
    order: 1;
}


/* @supports(position: sticky){
    ._scroll-anim-content{
        position: sticky !important;
        top: 0;
        order: 0 !important;
    }
} */

.begin-screen {
    position: relative;
    --scroll-anim-grow: 200vh;
    --logo-offset-y: -12vh;
    --logo-size: 520vw;
    --logo-scale: 0.042;
}

.begin-overlay {
    position: absolute;
    width: 100vw;
    height: 100vh;
    max-height: 100%;
    left: 0;
    top: 0;
    z-index: 6;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    user-select: none;
}

.begin-overlay-through .begin-overlay{
    pointer-events: none;
}

.begin-mask{
    background-color: #fff;
    mix-blend-mode: screen; /* iOS safari svg mask 性能低下，改用混合模式实现遮罩 */
}

.begin-logo-clip{
    flex-shrink: 0;
    width: var(--logo-size);
    height: var(--logo-size);
    transform: translate(0, calc( var(--logo-offset-y) * (1 - var(--progress)) )) scale( calc( var(--logo-scale) + ( var(--progress) * (1 - var(--logo-scale)) ) ) );
    transform-origin: center;
}

.begin-text{
    position: absolute;
    width: 100%;
    top: 50%;
    left: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    opacity: 0;
    transform: translateY(10%);
    transition: opacity .4s ease, transform .4s ease;
}

.begin-text-show .begin-text{
    opacity: 1;
    transform: translateY(0);
}

.begin-text p{
    color: #999;
}

.begin-text > h2{
    font-size: 2.8vw;
    letter-spacing: 1px;
    color: #333;
    margin-top: 18vh;
    margin-bottom: 4vh;
}

.begin-slip{
    cursor: pointer;
}

.begin-icon{
    font-size: 30px;
    width: 1em;
    height: 1em;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    margin: 0 auto;
}

.icon-mouse{
    /* background-image: url(../images/svg/icon-mouse.svg); */
    position: relative;
    width: .86em;
    height: 1.2em;
    border: 2px solid #999999;
    border-radius: 1em;
}
.icon-mouse::after{
    display: block;
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    margin: 0 auto;
    width: 3px;
    height: 6px;
    border-radius: 2px;
    background-color: var(--baseColor);
    animation: aniMouse 2s linear infinite;
}


.icon-down{

    animation: begin-icon 1s ease-in infinite alternate;
    background-image: url(../images/svg/icon-down.svg);
    animation-direction: alternate-reverse;
}

@keyframes begin-icon{
    100%{
        transform: translateY(30%)
    }
}

@media (max-width: 1200px){
    .begin-screen{
        --logo-scale: 0.06;
    }
    .begin-text > h2{
        font-size: 32px;
    }
}

@media (max-width: 500px){
    .begin-screen{
        --scroll-anim-grow: 140vh;
        --logo-size: 510vmax;
        --logo-scale: 0.09;
    }
    .begin-text > h2{
        font-size: 36px;
    }
}

.video-screen{
    position: relative;
    --scroll-anim-grow: 200vh;
}

.video-overlay{
    position: absolute;
    width: 100vw;
    height: 100vh;
    max-height: 100%;
    left: 0;
    top: 0;
    z-index: 6;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    user-select: none;
    pointer-events: none;
}

.video-overlay-through .video-overlay{
    pointer-events: auto;
}

.video-svg{
    position: absolute;
    width: 100%;
    height: auto;
    pointer-events: none;
}

#vsvg_mask_layer{
    transform: translate(0, calc( -100% * (1 - var(--mask-progress)) ))  scale( calc( 1 + ( 28 * (1 - var(--mask-progress)) ) ) );
    transform-origin: 50% 50%;
}

#vsvg_video_layer{
    --open-progress: 0;
    opacity: calc(1 * var(--logo-progress));
}

#vsvg_video_logo{
    opacity: calc(1 * (1 - var(--open-progress)) );
    transition: opacity .6s ease-out;
    transition-delay: .8s;
}
#vsvg_video_bg_left{
    transform-box: fill-box;
    transform: translateX(calc(-100% * var(--open-progress)));
    transition: transform .8s ease-out;
}
#vsvg_video_bg_right{
    transform-box: fill-box;
    transform: translateX(calc(100% * var(--open-progress)));
    transition: transform .8s ease-out;
}

.video-text{
    position: absolute;
    width: 100%;
    top: 6%;
    left: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: #fff;
    opacity: calc(1 * var(--logo-progress));
    transform: translate(0, calc( 40% * (1 - var(--logo-progress)) ));
    pointer-events: none;
    transition: opacity .4s ease;
}
.video-opened .video-text{
    opacity: 0;
}

.video-text > h2{
    font-size: 2.6vw;
    letter-spacing: 1px;
    font-weight: 500;
}

.video-text > h3{
    font-size: 1.6vw;
    letter-spacing: 1px;
    font-weight: 300;
}

.video-box{
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    pointer-events: none;
}

.video-canplay #vsvg_mask_layer{
    opacity: 0;
}

.video-canplay .video-box{
    opacity: 1;
}

.video-opened #vsvg_video_layer{
    --open-progress: 1
}

.video-opened #vsvg_video_logo{
    transition-delay: 0s;
}

.video-box>video{
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: #000;
}
.video-play{
    position: absolute;
    z-index: 1;
    width: 100%;
    height: 100%;
    cursor: pointer;
    opacity: 0;
    background-image: url('../images/svg/icon-play.svg');
    background-repeat: no-repeat;
    background-size: 3vw auto;
    background-position: center 56%;
    transition: opacity .4s ease;
}
.video-close{
    position: absolute;
    z-index: 1;
    top: 10px;
    right: 20px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    opacity: 0;
    background-image: url('../images/svg/icon-close.svg');
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
    transition: opacity .4s ease;
    pointer-events: none;
}
.video-canplay .video-box{
    pointer-events: auto;
}
.video-canplay .video-play{
    opacity: 1;
}
.video-opened .video-play{
    pointer-events: none;
    opacity: 0;
}
.video-opened .video-close{
    opacity: 1;
    pointer-events: auto;
}

@media (min-height: 90vw){
    .begin-screen{
        --scroll-anim-grow: 0;
    }
    .begin-overlay{
        display: none;
    }
    .video-screen{
        --scroll-anim-grow: 0;
    }
    .video-overlay{
        position: relative;
        top: 0;
        left: 0;
        height: 56.25vw; /* 16:9 */
        min-height: 300px;
    }
    .video-text{
        position: absolute;
        top: 0;
        height: 100%;
    }
    .video-text > h2{
        font-size: 5vw;
        margin-top: 3.2vw;
    }
    .video-text > h3{
        font-size: 3vw;
        margin-top: auto;
        margin-bottom: 2.4vw;
    }
    .video-play{
        background-size: 6vw auto;
    }
    .video-close{
        width: 30px;
        height: 30px;
    }
}