*{
    padding: 0;
    margin: 0;
    border: 0;
    font-size: 12px;
    background-color: rgba(0, 0, 0, 1);
}
header{
    background-color: rgba(0, 0, 0, 0.5);
    height: 100px;
    width:100%;
    position: fixed;
    z-index: 1;
}
header ul{
    position: absolute;
    left: 50vw;
    top: 50px;
    line-height: 40px;
    background-color: transparent;
}
header li{
    padding: 0;
    display: inline-flex;
    margin-right: 4vw;
    margin-top: 0px;
    background-color: transparent;
    transition: transform 0.3s ease, background-color 0.3s ease;
}
header li:hover{
    transform: scale(1.2);
}
header a {
    font-size: 12pt;
    color: rgb(255, 255, 255);
    text-decoration: none;
    font-family: "Microsoft YaHei";
    background-color: transparent;
    text-align: center;
    margin-right: 10px;
}
.copyright{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 20vh;
    color: white;
}
.copyright p{
    background: transparent; 
    z-index: 1; 
    font-size: 13pt; 
    margin-top: 250px; 
    font-family: Microsoft YaHei;
}
.menu{
    display: none;
}
.hidden {
    display: none;
}



/* home page style*/

.background{
    position: absolute; 
    width: 100%;
    margin-top: 100px;
    opacity: 70%;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.background:hover{
    position: absolute; 
    width: 100%;
    margin-top: 100px;
    opacity: 200%;
}
.foreground{
    position: absolute; 
    width: 15vw;
    background-color: transparent; 
    margin-top: 160px;
    margin-left: 5vw;
}

/* .cover{
    opacity: 0;
    transition: 2s;
    width: 0%
}
.cover.show{
    opacity: 1;
    width: 100%
}
.picture01{
    overflow-x: hidden;
    opacity: 0;
    transition: 2s;
    width: 0%
}
.picture01.show{
    overflow-x: hidden;
    opacity: 1;
    width: 100%
}
.picture02{
    overflow-x: hidden;
    opacity: 0;
    transition: 2s;
    width: 0%
}
.picture02.show{
    overflow-x: hidden;
    opacity: 1;
    width: 100%
}
.picture03{
    overflow-x: hidden;
    opacity: 0;
    transition: 2s;
    width: 0%;
}
.picture03.show{
    overflow-x: hidden;
    opacity: 1;
    width: 100%;
}
.picture04{
    overflow-x: hidden;
    opacity: 0;
    transition: 2s;
    width: 0%;
}
.picture04.show{
    overflow-x: hidden;
    opacity: 1;
    width: 100%
} */

.imgSize01{
    width: 45vw;
}
.imgSize02{
    width: 50vw;
}
.imgSize03{
    width: 45vw;
}
.imgSize04{
    width: 50vw;
}


.sectionA{
    height: 120vh;
}
.sectionB{
    height: 30vh;
}
.sectionC{
    height: 30vh;
}
.sectionD{
    height: 30vh;
}
.sectionE{
    height: 30vh;
}
.sectionF{
    height: 60vh;
}


.home{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
}
.home p{
    font-size: 12pt; 
    width: 60vw; 
    text-align: center; 
    font-family: Microsoft YaHei;
    letter-spacing: 2pt;
    line-height: 200%;
    margin: auto; /* 居中 */
    text-align: justify; /* 对齐 */
}

.homeTwoRow{
    display: flex; 
    flex-direction: row; 
    align-items: center;
    justify-content: center; 
    padding: 0vh 10vw 0vh 10vw;
}
.homeTwoRow_p01{
    font-size: 20pt; 
    color: white; 
    text-align: left; 
    width: 30vw; 
    line-height: 200%; 
    font-family: Microsoft YaHei; 
    letter-spacing: 2pt;
}
.homeTwoRow_p02{
    font-size: 12pt;
    color: white; 
    text-align: left; 
    width: 30vw; 
    line-height: 200%; 
    font-family: Microsoft YaHei; 
    letter-spacing: 0pt;
}
.homeTwoRow_p03{
    font-size: 12pt; 
    color: white; 
    text-align: left; 
    width: 30vw; 
    line-height: 200%; 
    font-family: Microsoft YaHei; 
    letter-spacing: 2pt;
    margin: auto; /* 居中 */
    text-align: justify; /* 对齐 */
}

.hometitle{
    font-family: "Microsoft YaHei";
    color: rgb(255, 255, 255); 
    position:absolute; 
    top: 60vh;
    left: 10vw;
    font-size: 16pt;
    background-color: transparent;
    font-weight: bold;
    letter-spacing: 2pt;
    z-index: 0;
    line-height: 200%;
}

.language-switcher {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: transparent;
}

.language-switcher button {
    margin: 0 5px;
    padding: 5px 10px;
    background-color: #333;
    color: white;
    border: none;
    cursor: pointer;
}

.language-switcher button:hover {
    background-color: #555;
}

.English{
 background-color: transparent;
}
.Chinese{
 background-color: transparent;
}

.video{
    width: 540px; height:318px;
}

/* RWD */
@media(max-width: 768px) {
    .language-switcher {
        background-color: transparent;
        position: relative;
        display: flex;
        flex-direction: row;
        align-items: right;
        justify-content: right;
        top: 25px;
        
    }
    
    .language-switcher button {
        margin: 0 5px;
        padding: 15px 20px;
        background-color: #333;
        color: white;
        border: none;
        cursor: pointer;
    }
    
    .language-switcher button:hover {
        background-color: #555;
    }
    header ul{
        display:none;
        left: 5vw;
        top: 80px;
        line-height: 40px;
    }
    header h1{
        left:50%;
        transform: translateX(-50%);
    }
    header li{
        display: block;
        margin-right:4vw;
        padding: 2vh;
    }
    header a {
        color: rgb(255, 255, 255);
        text-decoration: none;
        font-family: "Microsoft YaHei";
        font-size: 20px;
    }
    header a:hover{
        text-decoration: underline;
    }
    .menu{
        display:block;
        background-color: transparent;
        color: rgb(255, 255, 255);
        font-size: 35px;
        position: absolute;
        top: 15px;
        left: 20px;
        border: none;
        cursor: pointer;
        z-index:9999;
    }
    .hidden {
        display: none;
    }
    #popupMenu {
        position: absolute;
        border: 0px solid #000000;
        background-color: #000000;
        padding: 10px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.2);
        width: 50vw;
        height: 100vh;
    }
    .copyright{
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        height: 20vh;
        color: white;
    }
    .copyright p{
        background: transparent; 
        z-index: 1; 
        font-size: 10pt; 
        margin-top: 300px;
        font-family: Microsoft YaHei;
    }

    .background{
        position: relative; 
        width: 0%;
        margin-top: 100px;
        opacity: 70%;
        transition: transform 0.3s ease, opacity 0.3s ease;
    }
    
    .background:hover{
        position: relative; 
        width: 0%;
        margin-top: 100px;
        opacity: 200%;
    }
    .foreground{
        margin-top: 600px;
        width: 50vw;
        background-color: transparent; 
    }
    .cover{
        position: relative;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        opacity: 1;
        transition: 0s;
        height: 0vh;
    }
    .cover.show{
        opacity: 1;
    }



    .homeTwoRow{
        display: flex; 
        flex-direction: column; 
        align-items: center;
        justify-content: center; 
        padding: 0vh 10vw 0vh 10vw;
    }
    .homeTwoRow_p01{
        font-size: 10pt; 
        color: white; 
        text-align: left; 
        width: 70vw; 
        line-height: 200%; 
        font-family: Microsoft YaHei; 
        letter-spacing: 2pt;
        font-weight: bold;
    }
    .homeTwoRow_p02{
        font-size: 10pt;
        color: rgba(255, 255, 255, 0); 
        text-align: left; 
        width: 70vw; 
        line-height: 200%; 
        font-family: Microsoft YaHei; 
        letter-spacing: 0pt;
    }
    .homeTwoRow_p03{
        font-size: 10pt; 
        color: white; 
        text-align: left; 
        width: 70vw; 
        line-height: 200%; 
        font-family: Microsoft YaHei; 
        letter-spacing: 2pt;
        margin: auto; /* 居中 */
        text-align: justify; /* 对齐 */
    }

    .hometitle{
        font-family: "Microsoft YaHei";
        color: rgb(255, 255, 255); 
        position:relative; 
        display: flex;
        flex-direction: column;
        width: 80vw;
        font-size: 12pt;
        background-color: transparent;
        font-weight: bold;
        letter-spacing: 2pt;
        z-index: 0;
        line-height: 200%;
        text-align: center;
        align-items: center;
        justify-items: center;
    }

    .home{
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        color: rgb(255, 255, 255);
    }
    .home p{
        font-size: 12pt; 
        width: 80vw; 
        text-align: center; 
        font-family: Microsoft YaHei;
        letter-spacing: 2pt;
        line-height: 200%;
        margin: auto; /* 居中 */
        text-align: justify; /* 对齐 */
    }

    .imgSize01{
        width: 80vw;
    }
    .imgSize02{
        width: 80vw;
    }
    .imgSize03{
        width: 80vw;
    }
    .imgSize04{
        width: 80vw;
    }

    .sectionA{
        height: 70vh;
    }
    .sectionB{
        height: 20vh;
    }
    .sectionC{
        height: 20vh;
    }
    .sectionD{
        height: 20vh;
    }
    .sectionE{
        height: 20vh;
    }
    .sectionF{
        height: 30vh;
    }

    .picture01{
        overflow-x: hidden;
        opacity: 1;
        transition: 2s;
        width: 100%
    }
    .picture01.show{
        overflow-x: hidden;
        opacity: 1;
        width: 100%
    }
    .picture02{
        overflow-x: hidden;
        opacity: 1;
        transition: 2s;
        width: 100%
    }
    .picture02.show{
        overflow-x: hidden;
        opacity: 1;
        width: 100%
    }
    .picture03{
        overflow-x: hidden;
        opacity: 1;
        transition: 2s;
        width: 100%;
    }
    .picture03.show{
        overflow-x: hidden;
        opacity: 1;
        width: 100%;
    }
    .picture04{
        overflow-x: hidden;
        opacity: 1;
        transition: 2s;
        width: 100%;
    }
    .picture04.show{
        overflow-x: hidden;
        opacity: 1;
        width: 100%
    }
    .video{
        width: 80%;
    }
}