:root {
    --TopBarHeight: 5em;
}

iframe {
    width: 100%;
    height: 650px;
    border: 2px none red;
    /* 設置邊框以便於查看 */
}

.navbar {
    z-index: 10;
    position: fixed;
    width: 100%;
    min-height: var(--TopBarHeight);
}

.ChooseModel .line {
    margin: .3em 1.2em;
    min-width: 2px;
    min-height: 2px;
    background: white;
}

#floatModel {
    flex-direction: column;
    align-items: center;

    display: none;
    position: fixed;
    top: 80vh;
    left: calc(var(--TopBarHeight) * .3);
    padding: .3em .8em;
    border-radius: .5em;
    background: rgba(200, 83, 83, 0.422);
    color: white;
    cursor: grab;
}

#floatModel h2 {
    font-size: 1.2em;
    margin: 0;
}

#floatModel h4 {
    font-size: .7em;
    opacity: .6;
    margin: 0;
}

#bottom {
    display: flex;
    align-items: center;
    flex-direction: row;
    justify-content: space-between;

    background: black;
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 2.4em;
    color: white;
}

#bottom p {
    margin: .2em 0;
}

#bottom>p {
    font-size: calc(.5em + .5vw);
    margin: 0 .5em;
}

#bottom p:last-child {
    width: 6em;
}

#bottom a {
    color: aqua;
    text-decoration: none;
}

.topSpace {
    width: 100%;
    min-height: var(--TopBarHeight);
}

.Logo {
    height: 2em;
    margin: .3em .4em;
}

.collapse {
    justify-content: space-between;
}

.navbar-nav>li {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.dropdown-menu.show {
    right: 0;
    left: auto;
}

.ProjectorBox {
    display: flex;
    justify-content: space-evenly;
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;

    margin: 0 auto;
    width: 100%;
    max-width: 1000px;
}

.ProjectorBox img {
    width: 30%;
    max-width: 300px;
}

.ProjectorBox>.ProjectContent {
    width: 70%;
    max-width: 600px;
    text-align: center;
}

h1 span {
    font-size: .7em;
    margin: .5em;
    opacity: .5;
}

.ProjectorBox>.Line {
    width: 100%;
    max-width: 950px;
    height: .3em;
    margin: 1.6em 0;
    background: black;
}

.ProjectorBox .NP_Tip {
    margin: 1em 0 0;
    text-align: center;
}

@media screen and (max-width: 900px) {
    iframe {
        height: calc(200vw - 30px);
    }

    .ProjectorBox>img {
        width: 100%;
    }

    .ProjectorBox>div {
        width: 100%;
    }


    #floatModel {
        display: flex;
    }
}

@media screen and (max-width: 400px) {
    iframe {
        height: calc(300vw - 50px);
    }

    .ProjectorBox>img {
        width: 60%;
    }

    .ProjectorBox>div {
        width: 100%;
    }
}