header h1 {
    display: none;
}

.main {
    position: absolute;
    width: 100vw;
    height: 100vh;
    perspective: 1000px;
    -webkit-perspective: 1000px; /* Safari and Chrome */
    transform-style: preserve-3d;
    transform-origin: 0 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 登陆卡片 */
.main-loginCard {
    /* css定义变量的方式 */
    --X: 0;
    --Y: 0;
    position: relative;
    width: 750px;
    height: 500px;
    background-color: white;
    border-radius: 20px;
    transform-style: preserve-3d;
    box-shadow: 0 5px 30px rgba(0,0,0,0.5);
    transform: rotateX(var(--X)) rotateY(var(--Y)) translateZ(50px);
    transition: 0.1s ease;
    overflow: hidden;
}

.main-loginCard-close { /* 关闭按钮 */
    height: 20px;
    width: 20px;
    background-color: #ff7675;
    border-radius: 10px;
    left: 20px;
    top: 20px;
    position: absolute;
    z-index: 999;
}
.main-loginCard-close-hoverImg {
    height: 14px;
    width: 14px;
    position: absolute;
    left: 3px;
    top: 3px;
    display: none;
    cursor: pointer;
}

.main-loginCard-title {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}
.main-loginCard-title-logo {
    height: 110px;
    display: none;
}
.main-loginCard-title-logo-real {
    height: 100px;
}
.main-loginCard-title-word {
    text-align: center;
    color: #0984e3;
    font-size: 40px;

}

.main-loginCard-inputBox {
    position: relative;
    transform: translateY(-50px);
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}   
    /* 微信扫码登录 */
    .main-loginCard-inputBox-wechat {
        height: max-content;
        width: max-content;
        display: flex;
        justify-content: center;
        align-items: center;
        display: block;
    }
    .main-loginCard-inputBox-wechat-QR {
        height: 160px;
        transform: translateY(-50px);
    }
    .main-loginCard-inputBox-wechat-QR iframe {
        height: 220px;
        width: max-content;
    }
    /* 邮箱登录 */
    .main-loginCard-inputBox-mail {
        height: max-content;
        width: max-content;
        display: none;
    }
    .main-loginCard-inputBox-mail-account,
    .main-loginCard-inputBox-mail-password {
        height: 80px;
        width: 280px;
    }
    .main-loginCard-inputBox-mail-account-input,
    .main-loginCard-inputBox-mail-password-input {
        height: 50px;
        width: 280px;
        border: 1px solid #636e72;
        font-size: 20px;
        text-align: center;
        border-radius: 25px;
    }
    .main-loginCard-inputBox-mail-button {
        height: 50px;
        width: 280px;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    .main-loginCard-inputBox-mail-button-WeChatQR,
    .main-loginCard-inputBox-mail-button-submit {
        width: 130px;
        height: 50px;
        border-radius: 25px;
        cursor: pointer;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    .main-loginCard-inputBox-mail-button-WeChatQR {
        margin-right: 20px;
        background-color: #0984e3;
    }
    .main-loginCard-inputBox-mail-button-submit {
        background-color: #b2bec3;
    }
    .main-loginCard-inputBox-mail-button-WeChatQR-img {
        height: 25px;
    }
    .main-loginCard-inputBox-mail-button-submit-img {
        height: 25px;
    }

/* 背景 */
.main-background {
    list-style: none;
    position: absolute;
    overflow: hidden;
    bottom: 0;
    left: 0;
    width: 100vw;
    height: calc(100vh + 750px);
    z-index: 0;
    background-image: linear-gradient(to top, #cfd9df 10%, #74b9ff 90%);
}
.main-background li {
    width: 40px;
    height: 40px;
    border-radius: 5px;
    background-color: rgba(9,132,227,0.15);
    position: absolute;
    bottom: -160px;
}