@media (min-width:320px) and (max-width:480px) { /* smartphones, iPhone, portrait 480x320 phones */
    #navbarCollapse .navbar-nav {
        align-items: start !important;
    }

    #navbarCollapse .dropdown-menu {
        position: relative !important;
        border: none !important;
    }

    #navbarCollapse .nav-item.dropdown {
        width: 100%;
    }

    #navbarCollapse .dropdown-menu .dropdown-item {
        background: none !important;
        color: black !important;
    }

    #navbarCollapse .dropdown-sub {
        left: 10px !important;
    }

        #navbarCollapse .dropdown-sub li a {
            border: none !important;
        }

    #navbarCollapse .nav-item {
        width: 100%;
    }

    #navbarCollapse .dropdown-toggle {
        display: flex;
        justify-content: space-between;
    }

    .back-to-top {
        display: none !important;
    }

    .hotline-mobile-container {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 60px;
        background: var(--primary);
        z-index: 10000;
    }

        .hotline-mobile-container ul {
            display: flex;
            gap: 20px;
            justify-content: space-between;
            align-items: center;
            height: 100%;
            padding: 25px;
            margin: 0;
        }

            .hotline-mobile-container ul li {
                list-style: none;
            }

                .hotline-mobile-container ul li a, .hotline-mobile-container ul li a i {
                    color: white;
                    font-size: 26px;
                }

    .zalo {
        display: flex;
        height: 35px;
        margin-right: 20px;
    }

    .phone {
        position: relative;
        margin-right: 24px;
        margin-bottom: 20px;
        display: block;
    }

        .phone:before {
            content: '';
            height: 80px;
            background: var(--primary);
            display: flex;
            width: 80px;
            align-items: center;
            justify-content: center;
            border-radius: 80px;
            position: absolute;
            bottom: -16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: -1;
        }

    .footer .copyright .row {
        padding-bottom: 60px;
    }

    .b-card-42 .b_source li:first-child {
        margin: 0 !important;
    }
}

@media (min-width:481px) and (max-width:640px) { /* portrait e-readers (Nook/Kindle), smaller tablets @ 600 or @ 640 wide. */
    #navbarCollapse .navbar-nav {
        align-items: start !important;
    }

    #navbarCollapse .dropdown-menu {
        position: relative !important;
    }

    #navbarCollapse .nav-item.dropdown {
        width: 100%;
    }

    #navbarCollapse .dropdown-menu .dropdown-item {
        background: none !important;
    }

    #navbarCollapse .nav-item {
        width: 100%;
    }

    #navbarCollapse .dropdown-toggle {
        display: flex;
        justify-content: space-between;
    }

    .back-to-top {
        display: none !important;
    }

    .hotline-mobile-container {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 60px;
        background: var(--primary);
        z-index: 10000;
    }

        .hotline-mobile-container ul {
            display: flex;
            gap: 20px;
            justify-content: space-between;
            align-items: center;
            height: 100%;
            padding: 25px;
            margin: 0;
        }

            .hotline-mobile-container ul li {
                list-style: none;
            }

                .hotline-mobile-container ul li a, .hotline-mobile-container ul li a i {
                    color: white;
                    font-size: 26px;
                }

    .zalo {
        display: flex;
        height: 35px;
        margin-right: 20px;
    }

    .phone {
        position: relative;
        margin-right: 24px;
        margin-bottom: 20px;
        display: block;
    }

        .phone:before {
            content: '';
            height: 80px;
            background: var(--primary);
            display: flex;
            width: 80px;
            align-items: center;
            justify-content: center;
            border-radius: 80px;
            position: absolute;
            bottom: -16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: -1;
        }

    .footer .copyright .row {
        padding-bottom: 60px;
    }
    .b-card-42 .b_source li:first-child {
        margin: 0 !important;
    }
}

@media (min-width:641px) and (max-width:960px) { /* portrait tablets, portrait iPad, landscape e-readers, landscape 800x480 or 854x480 phones */
    #navbarCollapse .navbar-nav {
        align-items: start !important;
    }

    #navbarCollapse .dropdown-menu {
        position: relative !important;
    }

    #navbarCollapse .nav-item.dropdown {
        width: 100%;
    }

    #navbarCollapse .dropdown-menu .dropdown-item {
        background: none !important;
    }

    #navbarCollapse .nav-item {
        width: 100%;
    }

    #navbarCollapse .dropdown-toggle {
        display: flex;
        justify-content: space-between;
    }

    .back-to-top {
        display: none !important;
    }

    .hotline-mobile-container {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 60px;
        background: var(--primary);
        z-index: 10000;
    }

        .hotline-mobile-container ul {
            display: flex;
            gap: 20px;
            justify-content: space-between;
            align-items: center;
            height: 100%;
            padding: 25px;
            margin: 0;
        }

            .hotline-mobile-container ul li {
                list-style: none;
            }

                .hotline-mobile-container ul li a, .hotline-mobile-container ul li a i {
                    color: white;
                    font-size: 26px;
                }

    .zalo {
        display: flex;
        height: 35px;
        margin-right: 20px;
    }

    .phone {
        position: relative;
        margin-right: 24px;
        margin-bottom: 20px;
        display: block;
    }

        .phone:before {
            content: '';
            height: 80px;
            background: var(--primary);
            display: flex;
            width: 80px;
            align-items: center;
            justify-content: center;
            border-radius: 80px;
            position: absolute;
            bottom: -16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: -1;
        }

    .footer .copyright .row {
        padding-bottom: 60px;
    }
    .b-card-42 .b_source li:first-child {
        margin: 0 !important;
    }
}

@media (min-width:961px) and (max-width:1024px) { /* tablet, landscape iPad, lo-res laptops ands desktops */
    #navbarCollapse .navbar-nav {
        align-items: start !important;
    }
}

@media (min-width:1025px) and (max-width:1280px) { /* big landscape tablets, laptops, and desktops */

}

@media (min-width:1025px) and (max-width:1366px) { /* big landscape tablets, laptops, and desktops */

    html {
        font-size: 14px;
    }

    .navbar .navbar-nav .nav-link {
        margin-right: 20px;
    }
}

@media (min-width:1281px) { /* hi-res laptops and desktops */

}