body {
    font-family: "Noto Serif", "Times New Roman", sans-serif;
}
.nav-link {
    color: #000;
    background: #fff;
}
.nav-link:hover {
    color: #000;
    text-decoration: underline;
}
.top-screen.h-100 {
    height: 90vh!important;
    position: relative;
}
.top-screen {
    background-image: url(../img/back.jpg);
    background-size: cover;
}
.cursor-color {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    -webkit-mask-image: radial-gradient(circle, black, rgba(0,0,0,.9), rgba(0, 0, 0, 0) 40%);
    mask-image: radial-gradient(circle, black, rgba(0,0,0,.9), rgba(0, 0, 0, 0) 40%);
    mask-repeat: no-repeat;
    z-index: 0;
    transition: opacity .3s ease-in-out;
}
.top-screen .cursor-color {
    background-image: url(../img/back-color.jpg);
}
.top-screen .mb-auto {
    z-index: 1;
}
.top-screen header .text-end a {
    display: block;
    font-size: 2.25rem;
    line-height: 3rem;
    color: #000;
    text-decoration: none;
}
.top-screen header .text-end a:hover {
    color: #fff;
}
.top-screen h1 {
    display: inline-block;
    font-size: 3rem;
    font-weight: 400;
    background: #fff;
    padding: 1.5rem 2rem;
    border: 3px solid #000;
    position: relative;
    margin-bottom: 5rem;
    z-index: 1;
    transition: all .5s ease;
}
.top-screen h1:before, .top-screen .btn-lg:before, main section .btn-md:before {
    content: "";
    position: absolute;
    top: -12px;
    left: -12px;
    right: -12px;
    bottom: -12px;
    border: 3px solid #000;
    transition: all .1s ease;
}
main section .btn-md:before {
    top: -7px;
    left: -7px;
    right: -7px;
    bottom: -7px;
}
.top-screen .btn-lg {
    font-size: 2.25rem;
    text-transform: uppercase;
    padding: 1rem 3rem 0.25rem;
    line-height: 2rem;
    border-radius: 0;
    position: relative;
}
.top-screen .btn-lg span {
    display: block;
    font-size: 1.125rem;
    text-transform: none;
}
.top-screen .btn-lg + .btn-lg {
    margin-left: 40px;
}
.top-screen .btn-lg.btn-light, main section .btn-md.btn-light {
    background: #fff;
    border: 3px solid #000;
}
.top-screen .btn-lg.btn-dark, main section .btn-md.btn-dark {
    background: #000;
    border: 3px solid #fff;
    color: #fff;
}
.top-screen .btn-lg.btn-dark:before, main section .btn-md.btn-dark:before, main section.bg-dark .btn-md.btn-light:before {
    border-color: #fff;
}
.top-screen .btn-lg:hover:before {
    top: -17px;
    left: -17px;
    right: -17px;
    bottom: -17px;
}
main section .btn-md:hover:before {
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
}
main section h1 {
    font-size: 2.25rem;
    font-weight: 400;
    text-align: center;
}
main section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: .5rem;
    position: relative;
    z-index: 1;
}
main section p, main section ul {
    font-size: 1.25rem;
    margin: 0;
    position: relative;
    z-index: 1;
}
main section ul {
    list-style-type: square;
}
main section .btn-md {
    font-size: 1.5rem;
    text-transform: uppercase;
    padding: .5rem;
    line-height: 2rem;
    border-radius: 0;
    position: relative;
    display: block;
    text-align: center;
    z-index: 1;
    border-width: 2px!important;
}
main section div .col-md-12 .btn-md {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
}
main section .btn-md:before {
    border-width: 2px!important;
}
main section.what .row > div {
    min-height: 70vh;
    padding-bottom: 5rem!important;
    position: relative;
}
main section.what span {
    background: #fff;
}
main section.what .btn-md {
    margin-top: 2rem;
}
.bg-back {
    background-image: url(../img/back-old-color.jpg);
    background-size: auto!important;
    background-position: center right!important;
}
.bg-color {
    background-image: url(../img/back-color.jpg);
}
.bg-patent {
    background-image: url(../img/patent.jpg);
    background-color: #fff;
    background-size: contain!important;
    min-height: 100vh!important;
}
main section div .col-md-12 {
    position: relative;
    border: 3px solid #000;
    padding-bottom: 5rem!important;
}
main section .row:first-of-type {
    margin-top: 2rem;
}
main section .row + .row {
    margin-top: 1rem;
}
main section .row.like-table > div {
    display: table;
}
main section .row.like-table > div > .btn-md {
    display: table-cell;
}
.bg-module, .bg-panel, .bg-arch, .bg-inter, main section.what .row > div {
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
}
.bg-module .cursor-color, .bg-panel .cursor-color, .bg-arch .cursor-color, .bg-inter .cursor-color {
    -webkit-mask-image: radial-gradient(circle, black, rgba(0, 0, 0, .7), rgba(0, 0, 0, 0) 50%);
    mask-image: radial-gradient(circle, black, rgba(0, 0, 0, .7), rgba(0, 0, 0, 0) 50%);
    background-position: center center;
}
.bg-module {
    background-image: url(../img/bg-module-gs.jpg);
}
.bg-module .cursor-color {
    background-image: url(../img/bg-module-color.jpg);
}
.bg-panel {
    background-image: url(../img/bg-panel-gs.jpg);
}
.bg-panel .cursor-color {
    background-image: url(../img/bg-panel-color.jpg);
}
.bg-arch {
    background-image: url(../img/bg-arch-gs.jpg);
}
.bg-arch .cursor-color {
    background-image: url(../img/bg-arch-color.jpg);
}
.bg-inter {
    background-image: url(../img/bg-inter-gs.jpg);
}
.bg-inter .cursor-color {
    background-image: url(../img/bg-inter-color.jpg);
}
main section.bg-dark {
    color: #fff;
    background: #000!important;
}
main section.bg-dark.py-5 {
    padding-top: 6rem!important;
    padding-bottom: 6rem!important;
}
main section.bg-dark div .col-md-12 {
    border-color: #fff;
}
@media screen and (min-width: 992px) {
    .top-screen h1:hover {
        opacity: 0;
    }
}
@media screen and (min-width: 1200px) {
    .bg-color {
        margin-top: -20vh!important;
        border: 10px solid #fff;
    }
    .bg-color + div {
        height: 50vh!important;
    }
    .bg-patent {
        margin-top: -20vh!important;
    }
}
@media screen and (max-width: 1199.98px) {
    .bg-patent {
        min-height: 70vh!important;
    }
}
@media screen and (max-width: 991.98px) {
    .top-screen .btn-lg + .btn-lg {
        margin-left: 0;
        margin-top: 40px;
    }
    .top-screen, .cursor-color {
        background-position: center center;
    }
    main section.what .row > div {
        min-height: auto;
    }
}
@media screen and (max-width: 575.98px) {
    .top-screen header .text-decoration-none img, footer .text-decoration-none img {
        height: 80px!important;
    }
    .top-screen header .text-end a {
        font-size: 1.5rem;
        line-height: 2rem;
        background-color: #fff;
    }
    .top-screen header .text-end a:hover {
        background-color: #000;
    }
    .top-screen.h-100 {
        height: auto!important;
    }
    .top-screen h1 {
        font-size: 1.5rem;
        padding: 1rem 1.5rem;
        margin: 2rem 0 3rem;
    }
    .top-screen .btn-lg {
        font-size: 1.25rem;
        line-height: 1.5rem;
    }
    .top-screen .btn-lg span {
        font-size: 1rem;
    }
    .top-screen .btn-lg + .btn-lg {
        margin-bottom: 2rem;
    }
    main section h1 {
        font-size: 2rem;
    }
    main section div .col-md-12 {
        padding-bottom: 1rem!important;
    }
    main section div .col-md-12 .btn-md {
        position: relative;
        left: 0;
        right: 0;
        bottom: 0;
        margin-top: 1.5rem;
    }
}