@media (min-width: 1400px) {
    .container, .container-lg, .container-md, .container-sm, .container-xl {
        max-width: 1600px;
    }
}

.line {
    width: 100px;
    height: 6px;
    opacity: 1;
    background: #444693;
}

.color-purple {
    color: #444693;
}

.background-purple {
    background: #444693;
}

.center-x {
    left: 50%;
    transform: translateX(-50%);
}

.section-title {
    font-size: 50px;
}

.invalid {
    color: red;
}

.desc {
    width: 80%;
}

@media (max-width: 576px) {
    .section-title {
        font-size: 30px;
    }

    .desc {
        width: 100%;
    }
    .invalid {
        font-size: 14px;
    }
}

/* header */

header .navbar-brand {
    padding-top: 20px;
    padding-bottom: 20px;
}

header .navbar-nav .nav-item .nav-link {
    color: #333333;
    font-weight: bold;
    font-size: 20px;
}

header .navbar-nav .nav-item .btn.dropdown-toggle {
    color: #333333;
    font-weight: bold;
    font-size: 20px;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    margin-left: 28px;
}
header .navbar-nav .nav-item .btn.dropdown-toggle:focus {
    box-shadow: none;
}

header .navbar-nav .nav-item .btn.dropdown-toggle::before {
    content: '';
    display: block;
    width: 28px;
    height: 28px;
    background-image: url('../images/languange.png');
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
    position: absolute;
    left: 25px;
    /* top: 50%;
    transform: translateY(-50%); */
}

header .navbar-nav .nav-item .dropdown-menu .dropdown-item {
    text-align: center;
}

@media (min-width: 992px) {
    .navbar-expand-lg .navbar-nav .nav-link {
        padding-right: 25px;
        padding-left: 25px;
    }
    header .navbar-nav .nav-item .btn.dropdown-toggle {
        padding-right: 25px;
        padding-left: 25px;
    }
}
@media (max-width: 992px) {
    header .navbar-nav .nav-item .btn.dropdown-toggle {
        margin-left: 16px;
    }
    header .navbar-nav .nav-item .btn.dropdown-toggle::before {
        left: 0;
    }
    
    header .navbar-nav .nav-item .dropdown-menu .dropdown-item {
        text-align: left;
    }
}

@media (max-width: 576px) {
    header .navbar .navbar-brand {
        width: 140px;
    }
    header .navbar-nav .nav-item .btn.dropdown-toggle {
        margin-left: 16px;
    }
    header .navbar-nav .nav-item .btn.dropdown-toggle::before {
        left: 0;
    }

    header .navbar-nav .nav-item .dropdown-menu .dropdown-item {
        text-align: left;
    }
    
}

/* banner */

.banner {
    background-image: url('../images/home_banner_bg01.jpg');
    background-repeat: no-repeat;
    background-size: 100%;
    background-color: #f9f9f9;
    /* height: 860px; */
}

.banner .banner-info {
    width: 1050px;
    /* height: 613px; */
    opacity: 1;
    background: linear-gradient(#5254af 0%, #444693 100%);
    border-radius: 20px;
    box-shadow: 0px 0px 24px 0px rgb(51 51 51 / 20%);
    margin-top: 100px;
    margin-bottom: 88px;
    padding-left: 73px;
    padding-top: 107px;
    padding-right: 73px;
}

.banner .banner-info .info-container {
    left: 221px;
    top: 235px;
}

.banner h1 {
    opacity: 1;
    font-family: Microsoft YaHei Bold, Microsoft YaHei Bold-Bold;
    text-shadow: 1px 1px 1px rgba(51,51,51,0.40), 2px 2px 2px rgba(51,51,51,0.40);
    font-weight: bold;
    text-align: left;
    color: #ffffff;
    font-size: 56px;
    line-height: 80px;
    letter-spacing: 4px;
    /* top: 221px;
    left: 235px; */
}

.banner p {
    opacity: 1;
    font-size: 24px;
    font-family: Microsoft YaHei Regular, Microsoft YaHei Regular-Regular;
    font-weight: bold;
    text-align: left;
    color: #ffffff;
    letter-spacing: 0px;
}

.banner .banner-line {
    width: 200px;
    height: 6px;
    opacity: 1;
    background: #ffffff;
    margin-top: 50px;
    margin-bottom: 50px;
}

.banner .btn.chat {
    background-color: transparent;
    border: 1px solid #fff;
    margin-top: 50px;
    margin-bottom: 100px;
    padding: 10px 35px;
}

@media (max-width: 1650px) {
    .banner .banner-info {
        margin-left: 40px;
        margin-top: 75px;
        /* width: 829px;
        height: 413px; */
        margin-bottom: 40px;
    }
    .banner .banner-info .info-container {
        left: 121px;
        top: 135px;
    }
}

@media (max-width: 1400px) {
    .banner .banner-info {
        margin-left: 40px;
        margin-top: 75px;
        width: auto;
        /* height: 360px; */
        margin-bottom: 40px;
    }
    .banner .banner-info .info-container {
        left: 133px;
        top: 130px;
    }
    .banner h1 {
        font-size: 40px;
        line-height: 46px;
        letter-spacing: 4px;
        max-width: 700px;
    }

    .banner .banner-line {
        width: 50px;
        height: 3px;
        margin-top: 25px;
        margin-bottom: 25px;
    }
    
    .banner p {
        font-size: 18px;
        letter-spacing: 0px;
        width: auto;
    }

    .banner .btn.chat {
        font-size: 18px;
        padding: 5px 10px;
        margin-top: 25px;
        margin-bottom: 50px;
    }
}


@media (max-width: 1068px) {
    .banner .banner-info {
        margin-left: 50px;
        margin-top: 50px;
        padding-top: 30px;
        padding-bottom: 30px;
        /* width: 500px;
        height: 260px; */
    }
    .banner .banner-info .info-container {
        left: 110px;
        top: 90px;
    }
    .banner h1 {
        font-size: 30px;
        top: 65px;
        left: 100px;
        max-width: 500px;
    }

    .banner .banner-line {
        margin-top: 5px;
        margin-bottom: 5px;
    }
    
    .banner p {
        font-size: 14px;
        width: 368px;
        margin-bottom: 0;
    }
    

    
    .banner .btn.chat {
        margin-top: 5px;
        margin-bottom: 5px;
        font-size: 14px;
        padding: 5px 10px;
    }
}

@media (max-width: 768px) {
    .banner h1 {
        font-size: 16px;
        line-height: 24px;
        top: 55px;
        left: 80px;
        max-width: 350px;
    }

    .banner .banner-line {
        width: 50px;
        height: 3px;
        top: 120px;
        left: 80px;
    }
    
    .banner p {
        font-size: 14px;
        top: 130px;
        left: 80px;
        width: 300px;
        margin-bottom: 0;
    }
    

    
    .banner .btn.chat {
        top: 180px;
        left: 80px;
        font-size: 12px;
        padding: 3px 8px;
    }
}

@media (max-width: 576px) {
    .banner {
        height: 685px;
        background-color: #f9f9f9;
        background-image: url('../images/phone_home_banner_bg01.png');
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .banner .banner-info {
        width: 500px;
        height: 260px;
        width: 350px;
        height: 500px;
        margin: 4px auto;
        padding-left: 19px;
        padding-right: 14px;
    }
    .banner .banner-info .info-container {
        left: 80px;
    }
    .banner h1 {
        font-size: 27px;
        line-height: 36px;
        letter-spacing: 4px;
        top: 158px;
        left: 50px;
        max-width: 315px;
    }

    .banner .banner-line {
        width: 50px;
        height: 1px;
        margin-top: 30px;
        margin-bottom: 30px;
    }
    
    .banner p {
        font-size: 16px;
        letter-spacing: 0px;
        top: 310px;
        left: 50px;
        width: 300px;
    }
    
    .banner .btn.chat {
        margin-top: 29px;
        font-size: 14px;
        padding: 5px 10px;
    }
}

/* points */
.points {
    background-color: #f9f9f9;
}

/* service */
.service .card-title {
    margin-left: 59px;
    margin-top: 81px;
    margin-bottom: 41px;
    color: #333333;
    font-size: 38px;
    font-weight: bold;
}

.service .card-text {
    margin-left: 80px;
    font-size: 24px;
    color: #555555;
    margin-bottom: 10px;
}

@media (max-width: 1650px) {
    .service .card-title {
        margin-left: 26px;
        margin-top: 20px;
        margin-bottom: 25px;
        font-size: 27px;
    }
    .service .card-text {
        margin-left: 57px;
        font-size: 19px;
        margin-bottom: 10px;
    }
}


@media (max-width: 1068px) {
    .service .card-title {
        margin-left: 5px;
        margin-top: 5px;
        margin-bottom: 10px;
        font-size: 20px;
    }
    .service .card-text {
        margin-left: 15px;
        font-size: 16px;
        margin-bottom: 1px;
    }
}

@media (max-width: 768px) {
    .service .card-title {
        margin-left: 20px;
        margin-top: 20px;
        margin-bottom: 15px;
        font-size: 30px;
    }
    .service .card-text {
        margin-left: 25px;
        font-size: 18px;
        color: #555555;
        margin-bottom: 5px;
    }
}

@media (max-width: 576px) {
    .service .card-title {
        margin-left: 10px;
        margin-top: 10px;
        margin-bottom: 10px;
        font-size: 20px;
    }
    .service .card-text {
        margin-left: 15px;
        font-size: 12px;
        color: #555555;
        margin-bottom: 5px;
    }
}

/* advantages */
.advantages {
    background-color: #f9f9f9;
}
.advantages .box {
    width: 292px;
    height: 361px;
    background-repeat: no-repeat;
    background-position: center;
    position: relative;
}

/* .advantages::before {
    position: absolute;
    display: block;
    content: '';
    background-image: url('../images/quan.png');
    background-repeat: no-repeat;
    background-position: center;
    width: 1543px;
    height: 335px;
    border-radius: 50% / 50%;
    bottom: 82px;
    left: 50%;
    transform: translateX(-50%);
} */

.advantages .box.firebase {
    background-image: url('../images/cp_firebase.png');
    top: 80px;
}

.advantages .box.gp {
    background-image: url('../images/cp_GooglePlay.png');
    top: 40px;
}

.advantages .box.am {
    background-image: url('../images/cp_ad_mob.png');
}

.advantages .box.galt {
    background-image: url('../images/cp_Google_Analytics.png');
    top: 40px;
}

.advantages .box.gads {
    background-image: url('../images/cp_ads.png');
    top: 80px;
}

.advantages .box .advantage-sub-title {
    bottom: 50px;
}

.advantages .gcp {
    width: 480px;
    height: 252px;
    top: 71px;
    background-repeat: no-repeat;
    background-position: center;
    background-image: url('../images/cp_pub2last.png');
}

@media (max-width: 576px) {
    .advantages .box {
        width: 100%;
        height: 100px;
        background-size: 100%;
    }

    .advantages .box p {
        font-size: 10px;
        margin-bottom: 5px;
    }
    
    .advantages::before {
        /* position: absolute;
        display: block;
        content: '';
        background-size: 90%;
        width: 100%;
        height: 335px;
        bottom: 82px;
        left: 50%;
        transform: translateX(-50%); */
    }
    
    .advantages .box.firebase {
        background-image: url('../images/cp_firebase.png');
        top: 20px;
    }
    
    .advantages .box.gp {
        background-image: url('../images/cp_GooglePlay.png');
        top: 10px;
    }
    
    .advantages .box.am {
        background-image: url('../images/cp_ad_mob.png');
    }
    
    .advantages .box.galt {
        background-image: url('../images/cp_Google_Analytics.png');
        top: 10px;
    }
    
    .advantages .box.gads {
        background-image: url('../images/cp_ads.png');
        top: 20px;
    }
    
    .advantages .box .advantage-sub-title {
        bottom: 10px;
    }
    
    .advantages .gcp {
        width: 480px;
        height: 252px;
        top: 71px;
        background-repeat: no-repeat;
        background-position: center;
        background-image: url('../images/cp_pub2last.png');
    }
}

/* contact */

.contact h1 {
    font-size: 50px;
}

.contact .btn.submit {
    width: 200px;
    height: 60px;
    opacity: 1;
    background: #444693;
    color: #fff;
}

.contact .desc {
    font-size: 28px;
}

.contact h2 {
    color: #444693;
}

.contact .icon {
    padding-left: 55px;
    margin-bottom: 39px;
    font-size: 24px;
    color: #333333;
}

.contact .icon::after {
    content: '';
    display: block;
    width: 44px;
    height: 44px;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);

}

.contact .icon.wechat::after {
    background-image: url('../images/wechat.png');
}

.contact p.wechat {
    cursor: pointer;
}

.contact p.wechat img.wechat-qc {
    transform: translateX(-200%);
    left: 0;
    top: -140px;
    z-index: 1;
    transition: all 1s;
}

.contact p.wechat:hover img.wechat-qc {
    transform: translateX(0);
}

.contact .icon.email::after {
    background-image: url('../images/email.png');
}

.contact .icon.address::after {
    background-image: url('../images/address.png');
}

.contact .form-control {
    background-color: #ededed;
    color: #666666;
}

@media (max-width: 576px) {
    .contact h1 {
        font-size: 30px;
    }

    .contact .line {
        height: 3px;
    }

    .contact .desc {
        font-size: 15px;
    }

    .contact h2 {
        font-size: 20px;
        color: #444693;
    }

    .contact .icon {
        padding-left: 25px;
        margin-bottom: 15px;
        font-size: 16px;
    }
    
    .contact .icon::after {
        width: 22px;
        height: 22px;
        background-size: 100%;
    }

    .contact .form-control {
        font-size: 14px;
    }

    .contact .btn.submit {
        width: 100%;
    }
}

/* footer */
footer {
    background: #f9f9f9;
}

footer p {
    font-size: 16px;
    margin: 0;
}