#app {
    width: 100%;
    height: calc(100vh - 5em);
    
    --baseFontSizeBL: 1;
    box-sizing: border-box;
    color: var(--el-text-color-primary);
    overflow: hidden;
    overflow-y: auto;
    word-break: break-word;
}

.mian1 {
    width: 100vw;
    padding: 1px 6vw;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 10vh !important;
    box-sizing: border-box;
    justify-content: flex-start;
    position: relative;
    font-size: calc(var(--baseFontSizeBL)* 1em);
}

.mian1>h1 {
    font-size: 10em;
    margin: 0em;
    width: 10em;
    text-align: center;
    font-weight: 500;
    z-index: 1;
}

.mian1>p {
    font-size: 3em;
    width: 27em;
    text-align: center;
    margin: 2em 0;
    z-index: 1;
}

.link_btn {
    font-size: 2em;
    padding: 0.5em 2em;
    border-radius: 2em;
    cursor: pointer;
    z-index: 1;
    background: var(--el-color-primary);
    cursor: pointer;
    color: #fff;
}

.video {
    width: 70vw;
    height: calc(70vw / 1.78);
    position: relative;
    border-radius: 1em;
    overflow: hidden;
    background: var(--el-bg-color-page);
    box-shadow: 0 0 30px var(--el-border-color-darker);
    margin: 5em 15vw 0;
}

.video iframe{
    width: 100%;
    height: 100%;
}

.main2 {
    display: grid;
    grid-template-columns: calc(50% - 6em) calc(50% - 2em);
    align-items: start;
    box-sizing: border-box;
    padding: 10em 15vw;
    justify-content: space-between;
    font-size: calc(var(--baseFontSizeBL) * 1em);
}

.main2 h2 {
    font-size: 4.5em;
    margin-top: 0;
}

.main2 p {
    font-size: 3em;
    line-height: 1.5;
    margin: 0;
}

.main2 img {
    width: 100%;
    box-shadow: 0 0 5em var(--el-border-color-darker);
}

.main2>div {
    width: fit-content;
}

.main3 {
    display: grid;
    grid-template-columns: calc(50% - 6em) calc(50% - 2em);
    align-items: start;
    padding: 10em 15vw;
    justify-items: end;
    justify-content: space-between;
    font-size: calc(var(--baseFontSizeBL) * 1em);
}

.main3 h2 {
    font-size: 4.5em;
    margin-top: 0;
}

.main3 p {
    font-size: 3em;
    line-height: 1.5;
    margin: 0;
}

.main3 img {
    width: 100%;
    box-shadow: 0 0 5em var(--el-border-color-darker);
}

.main3>div {
    width: fit-content;
}

.main4 {
    padding: 10em 18vw;
    display: grid;
    grid-template-columns: 50% 50%;
    grid-template-rows: auto auto;
    font-size: calc(var(--baseFontSizeBL) * 1em);
}

.main4_item {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 5em 0;
    font-size: 0.8em;
}

.main4_item h2 {
    font-size: 3em;
    width: 100%;
    text-align: center;
}

.main4_item_top {
    background: #00bbdd;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 100vh;
    font-size: 1em;
    width: 7em;
    height: 7em;
    padding: 2em;
    position: relative;
}

.main4_item_top svg {
    width: 100%;
    height: 100%;
}

svg.icon.phone {
    position: absolute;
    font-size: 1em;
    width: 5em;
    height: 5em;
    right: 0em;
    bottom: 2em;
    z-index: 1;
}

.main4_item_top svg path {
    fill: #fff;
}

@media screen and (max-width: 900px) {
    .mian1 {
        width: 100vw;
        height: unset;
        min-height: calc(100vw / 1.78);
        padding-top: 10vh !important;
        padding-bottom: 10vh !important;
        background-size: auto 100%;
        font-size: 0.4em;
    }
    .mian1>p {
        font-size: 5em;
        width: 100%;
    }
    .link_btn {
        font-size: 4em;
        padding: 0.5em 2em;
        border-radius: 2em;
        cursor: pointer;
        z-index: 1;
        background: var(--el-color-primary);
    }
    .main3,
    .main2 {
        font-size: 0.5em;
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100vw;
        padding: 10em 12vw;
    }
    .main3>div,
    .main2>div {
        width: fit-content;
        text-align: center;
        margin-bottom: 2em;
    }
    .main3>div{
        grid-area: div;
    }
    .main3>img{
        grid-area: img;
    }
    .main3 {
        display: grid;
        grid-template-columns: unset;
        grid-template-areas:
            "div"
            "img";
        box-sizing: border-box;
    }
    .main4 {
        font-size: 0.5em;
        display: flex;
        flex-direction: column;
        padding: 0 12vw;
    }
}