@media screen and (min-width:320px) and (max-width:1023px) {

    html {
        font-size: 14px;
    }

    header {
        position: static;
        width: 100vw;
        height: auto;
        padding: 0 5vw;
    }

    .navbar {
        display: block;
        top: 40px;
    }

    nav,
    header .logo-block .line,
    .video-block .square,
    .title .line,
    .video-block #videoBG {
        display: none;
    }

    .video-block {
        background: url(../images/mobile.jpg) center center no-repeat;
        background-size: cover;
    }

    header .logo-block {
        height: auto;
        text-align: left;
        padding-left: 25px;
    }

    header .logo-block img.logo1 {
        width: auto;
        height: 40px;
    }

    header .logo-block img.logo2 {
        width: auto;
        height: 25px;
        position: relative;
        top: -5px;
    }

    main {
        margin-left: 0;
    }

    .video-block .motto {
        padding: 25px 10vw;
    }

    .video-block {
        height: 70vh;
    }

    .title,
    section.aboutus-block .txt {
        padding-left: 0;
    }

    .center {
        padding: 25px 10vw;
    }

    h2 {
        font-size: 2rem;
    }

    section.offer-block .list .item {
        flex-basis: 100%;
    }

    section.offer-block .list .item:nth-child(1) {
        order: 2;
    }

    section.offer-block .list .item:nth-child(2) {
        order: 1;
    }

    section.offer-block .list .item:nth-child(3) {
        order: 3;
    }

    section.offer-block .list .item:nth-child(4) {
        order: 4;
    }

    section.offer-block .list .item:nth-child(5) {
        order: 6;
    }

    section.offer-block .list .item:nth-child(6) {
        order: 5;
    }

    section.offer-block .list .item:nth-child(7) {
        order: 7;
    }

    section.offer-block .list .item:nth-child(8) {
        order: 8;
    }

    section.offer-block .list .item:nth-child(9) {
        order: 10;
    }

    section.offer-block .list .item:nth-child(10) {
        order: 9;
    }

    section.offer-block .list .item.content {
        padding: 25px 0;
    }

    section.offer-block .list .item.content span {
        padding-left: 0;
    }

    section.contact-block .txt {
        flex-wrap: wrap;
    }

    section.offer-block .list .item.content .txt,
    section.contact-block .left,
    section.contact-block .right {
        flex-basis: 100%;
        text-align: center;
    }

    section.certificates-block .list a {
        flex-basis: 48%;
        margin-bottom: 15px;
    }

    section.realizations-block .list a {
        flex-basis: 50%;
        height: 125px;
    }

    section.contact-block .left {
        border-bottom: 1px solid #202429;
        margin-bottom: 30px;
    }

    section.map-block .map {
        height: 40vh;
    }

    .copyright {
        text-align: center;
    }

    header .social-block {
        height: auto;
        padding: 20px 0;
    }

}

@media screen and (min-width:480px) and (max-width:1023px) {

    header .logo-block img.logo1 {
        height: 55px;
    }

    header .logo-block img.logo2 {
        height: 40px;
    }

    .navbar {
        top: 50px;
        right: 10vw;
    }

}

@media screen and (min-width:600px) and (max-width:1023px) {

    header .logo-block img.logo1 {
        margin-right: 20px;
    }

    section.realizations-block .list a {
        height: 200px;
    }

    .title {
        text-align: center;
    }

}

@media screen and (min-width:768px) and (max-width:1023px) {}

@media screen and (min-width:1024px) and (max-width:1439px) {

    html {
        font-size: 16px;
    }

    header {
        padding: 0 25px;
    }

    header .logo-block img {
        width: 50%;
    }

    nav a {
        padding-top: 15px;
        padding-bottom: 15px;
    }

    header .social-block span {
        display: inline-block;
        position: relative;
        top: -10px;
    }

    .video-block .square {
        width: 75px;
        height: 75px;
    }

    .video-block .square a {
        width: 30px;
        height: 60px;
    }

    .video-block .square a img {
        width: 15px;
    }

    section.offer-block .list .item {
        min-height: 225px;
    }

    section.offer-block .list .item.content {
        padding: 0 20px;
    }

    .center {
        padding-left: 50px;
        padding-right: 50px;
    }

    section.realizations-block .list a {
        height: 200px;
    }
}

@media screen and (min-width:1280px) and (max-width:1439px) {

    header .logo-block img.logo1 {
        width: 40%;
    }

    header .logo-block .line {
        margin: 15px 0;
    }

    header .social-block span {
        top: -15px;
    }

}

@media screen and (min-width:1366px) and (max-width:1439px) {

    nav {
        height: 51vh;
    }

    header .social-block {
        height: 12vh;
    }

    header .social-block span {
        top: -8px;
    }

    header .logo-block .line {
        margin: 25px 0;
    }

    section.realizations-block .list a {
        height: 225px;
    }
}

@media screen and (min-width:1440px) and (max-width:1679px) {

    html {
        font-size: 18px;
    }

    header .logo-block img.logo1 {
        width: 60%;
        max-width: 174px;
    }

    header .logo-block img.logo2 {
        width: 70%;
        max-width: 220px;
    }

    nav a {
        padding-top: 20px;
        padding-bottom: 20px;
    }

    header .social-block span {
        position: relative;
        top: -10px;
    }

    section.realizations-block .list a {
        height: 250px;
    }
}

@media screen and (min-width:1600px) and (max-width:1919px) {

    header .logo-block .line {
        margin: 20px 0;
    }
}

@media screen and (min-width:1680px) and (max-width:1919px) {

    section.realizations-block .list a {
        height: 275px;
    }

    header .logo-block .line {
        margin: 40px 0;
    }

}

@media screen and (min-width:1800px) and (max-width:1919px) {}