.sub-promotion {
    position: relative;
    width: 100%;
    height: 500px;
    display: flex;
    justify-content: center;
    background-color: #000;
    background-position: center;
    background-size: cover;
    overflow: hidden;
}
.sub-promotion::before {
    content: '';
    position: absolute;
    top: 0;
    width: 100%;
    height: 150px;
    background: linear-gradient(to bottom, #000000bb 0%, transparent 100%);
    z-index: 1;
}

.sub-promotion-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.sub-p-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    text-align: center;
    margin-top: 2rem;
}

.sub-p-text h5 {
    color: #fff;
    font-size: 50px;
    font-weight: 600;
}

.p-route {
    color: #fff;
    font-size: 17px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.sub-navigation {
    position: absolute;
    bottom: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(10px);
    z-index: 20;
}

.sub-navBtn {
    color: rgba(255, 255, 255, .7);
    font-size: 18px;
    padding: 18px 40px;
    background-color: rgba(0, 0, 0, .2);
    white-space: nowrap;
}

.sub-navBtn.show {
    color: #222 !important;
    font-weight: 700;
    background-color: #fff;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, .08);
}

.sub-navBtn:hover {
    color: #fff;
}


.about {
    background: url(../images/about-bg.jpg);
}
.business {
    background: url(../images/business-bg.jpg);
}
.product {
    background: url(../images/product-bg.jpg);
}
.career {
    background: url(../images/career-bg.jpg);
}
.contact {
    background: url(../images/contact-bg.jpg);
}


/*==================================================*/
@media (max-width: 1450px) {
    .sub-nav-wrapper {
        width: 100%;
    }
}


@media (max-width: 850px) {
    .sub-promotion.product {
        height: 500px !important;
    }

    .sub-navigation {
        backdrop-filter: blur(0);
    }
    
    .sub-navigation.prd {
        padding: 0 50px;
        padding-bottom: 20px;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .sub-navigation.prd .sub-navBtn {
        font-size: 15px;
        padding: 15px 30px;
        border-radius: 50px;
    }

    .sub-navBtn {
        backdrop-filter: blur(10px);
    }
}


@media (max-width: 550px) {
    .sub-promotion {
        height: 360px;
    }

    .sub-p-text {
        margin-top: 1rem;
    }

    .sub-p-text h5 {
        font-size: 40px;
    }

    .p-route {
        font-size: 15px;
    }

    .sub-navBtn {
        font-size: 15px;
        padding: 15px 30px;
    }

    .sub-navigation.prd {
        padding: 0 10px;
        padding-bottom: 20px;
    } 

    .sub-navigation.prd .sub-navBtn {
        font-size: 15px;
        padding: 12px 22px;
    }
}