html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Georgia, Arial, Helvetica, sans-serif;
    color: #444444;
    font-size: 16px;
}

footer {
    background: linear-gradient(rgba(0, 0, 0, 0),
            rgba(0, 0, 0, 0.5)), url("media/footer.jpg");
    background-position: center center;
    margin: 0;
    padding: 0;
    text-align: center;
    color: #aeaeae;
    font-size: medium;
}

#tab-logo {
    height: 200%;
}

#logo-img1,
#logo-img2,
#logo-img3 {
    height: 1.875em;
    display: block;
    position: fixed;
    top: 1em;
    z-index: 2;
}

#logo-img1 {
    left: 1.25em;
}

#logo-img2 {
    left: 8.125em;
}

#logo-img3 {
    left: 14.5em;
}

#navigation-bar {
    margin: 0;
    text-align: center;
    background-color: white;
    box-shadow: 0em 0.5em 0.3125em -0.3125em rgba(0, 0, 0, 0.2);
    z-index: 1;
    position: -webkit-sticky;
    /* Safari */
    position: sticky;
    top: 0;
}

#navigation-bar ul {
    display: inline-block;
    margin: 0;
    padding: 0;
    text-align: center;
}

#navigation-bar li {
    display: inline-block;
    margin: 0;
    padding: 1.25em 0;
    list-style: none;
}

#navigation-bar li:hover a::before {
    right: 0;
    left: 0;
}

#navigation-bar a {
    color: #444444;
    font-size: 1.25em;
    text-decoration: none;
    position: relative;
    bottom: 0;
    transition: all 0.3s ease;
    padding: 1em 0.625em;
    margin: 0;
}

#navigation-bar a:hover {
    color: #0054a6;
}

#navigation-bar a::before {
    content: "";
    transition: all 0.4s ease-in-out;
    position: absolute;
    right: 50%;
    left: 50%;
    bottom: 0;
    height: 0.1em;
    background-color: #0054a6;
}

#navigation-bar a {
    color: #444444;
    font-size: 1.25em;
    text-decoration: none;
}

#about-company-container {
    text-align: left;
    margin: auto;
    width: 50%;
    margin-bottom: 1.25em;
}

#about-company-header {
    padding: 0;
    margin: 0;
}

#about-company-title {
    text-align: center;
    margin-bottom: 0.4em;
}

#about-company-logo {
    display: block;
    margin: auto;
    height: 20em;
}

.about-company-partners {
    text-align: center;
    padding: 0.625em 0;
    margin: 0;
}

.about-company-txt {
    text-align: left;
}

#about-company-video {
    display: block;
    margin-left: 0;
    width: 98%;
    height: 34em;
}

#details-container {
    background-color: #e9ecf0;
}

#details-content,
#quality-content,
#contacts-content {
    display: block;
    width: 50%;
    margin: auto;
    padding: 1.25em 0 2.5em 0;
}

.details-title {
    text-align: center;
    padding: 0.625em 0;
    margin: 0;
}

#products-container {
    margin: 0;
    padding: 0;
}

#products-header,
#quality-header {
    margin: 0;
    padding: 6.25em 0;
    text-align: center;
}

#products-header {
    background: linear-gradient(rgba(0, 0, 0, 0.2),
            rgba(0, 0, 0, 0.2)), url("media/products.jpg");
    background-position: center 46.875em;
}

#quality-header {
    background: linear-gradient(rgba(0, 0, 0, 0.5),
            rgba(0, 0, 0, 0.5)), url("media/quality.jpg");
    background-position: center 68.75em;
}

#products-title,
#quality-title {
    color: white;
    text-align: center;
    font-size: 2.5em;
}

.products-file-name {
    text-align: center;
}

.products-file-pc,
.products-file-mobile {
    width: 100%;
    height: 37.5em;
}

.products-file-mobile {
    display: none;
}

#quality-content {
    text-align: center;
}

.quality-txt {
    text-align: left;
}

#quality-list {
    text-align: left;
}

#quality-certificates-container {
    display: inline-block;
    text-align: center;
    margin: 0 -50%;
}

.quality-certificate {
    display: inline-block;
    height: 37.5em;
    width: auto;
    margin: 0.625em;
}

#contacts-content {
    text-align: center;
}

#contacts-form {
    margin: 0 -50%;
}

.contacts-form-column, #contacts-form-message-container  {
    display: inline-block;
    margin: 0 0.625em;
}

.contacts-fname {
    text-align: left;
    padding: 0;
    margin: 0;
}

.contacts-finput {
    display: block;
}

#contacts-form-message-container {
    display: inline-block;
    margin: 0 0.625em;
}

#contacts-fmessage-name {
    float: left;
}

#contacts-fmessage {
    display: block;
    margin: auto;
    width: 50em;
}

#contact-us {
    color: rgb(227, 241, 247);
    padding: 0.625em;
}

#contact-us-header {
    color: white;
    margin: 0;
    padding: 0.625em;
    font-size: 1.875em;
}

#contacts {
    font-size: medium;
    padding: 0;
    margin: auto;
    text-align: center;
}

.contacts-column {
    margin: 0;
    text-align: center;
    display: inline-block;
}

.contacts-address-txt,
.contacts-column-title,
.contacts-column-ref {
    margin: 0;
    padding: 0.3125em;
}

.contacts-column-ref a:link {
    color: white;
}

#copyright {
    color: rgb(227, 241, 247);
    clear: both;
    padding: 0.3125em;
    background-color: #134774;
}

@media only screen and (max-width: 82em) {

    #logo-img1,
    #logo-img2,
    #logo-img3 {
        visibility: hidden;
    }

    #navigation-bar {
        position: static;
    }

    #about-company-container,
    #details-content {
        width: 90%;
    }

    #navigation-bar li {
        padding: 0.75em 0;
    }

    #navigation-bar a {
        padding: 0.6em 0.3125em;
    }

    #about-company-video {
        height: 25em;
        width: 100%;
    }

    #products-header,
    #quality-header {
        padding: 3.25em 0;
    }

    #details-content,
    #quality-content,
    #contacts-content {
        width: 90%;
    }

    #quality-certificates-container {
        width: 100%;
    }

    .quality-certificate {
        width: 100%;
        height: auto;
        margin: 0.625em 0;
    }

    #contacts-form {
        margin: 0;
    }

    #contacts-form-message-container {
        width: 100%;
        margin: 0;
    }

    #contacts-fmessage-name {
        float: none;
    }

    #contacts-fmessage {
        float: left;
        width: 100%;
    }

    .products-file-pc {
        display: none;
    }

    .products-file-mobile {
        display: inline;
        margin: auto;
    }
}

/* @media only screen and (hover: none) and (pointer: coarse) {

    .products-file-pc {
        display: none;
    }

    .products-file-mobile {
        display: inline;
        margin: auto;
    }
} */