body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto Slab', serif;
    font-size: 20px;
    font-weight: 400;
    line-height: 1.5;
    color: #fff;
    background-color: #010101;
}

*,
*:before,
*:after {
    box-sizing: border-box;
}
h1, h2, h3, h4, h5, h6 {
    margin: 0;
}

:root {
    --index: calc(1vw + 1vh);
    --transition: transform .75s cubic-bezier(.075, 0.5, 0, 1);
    --primary-rgb: 	47, 189, 91
}



/* Smooth Scroll */

.scroll-container {
    will-change: transform;
}

/* Header*/

.container__nav{
    width: 100%;
    max-width: 1230px;
    margin: 0 auto;
    padding: 0 15px;
}
.header {
    width: 100%;

    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: black;
    transition: opacity 0.3s;
}
.header.active{
    color: crimson;
}
.header_inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 65px;
}
.header_logo {
    font-size: 24px;
    font-weight: 400;
}
.header_logo a{
    text-decoration: none;
    color: #fff;
}
.nav-toggle{
    display: none;
    width: 30px;
    padding: 10px 0;

    position: absolute;
    top: 23px;
    right: 23px;
    z-index: 20;
}
.nav-toggle:focus{
    outline: none;
}
.nav-toggle:hover{
    cursor: pointer;
}
.nav-toggle.active .nav-toggle_item{
    background: none;
}
.nav-toggle_item{
    display: block;
    width: 30px;
    height: 3px;
    background-color: #fff;

    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    transition: background .2s linear;
}
.nav-toggle_item:before,
.nav-toggle_item:after{
    content: "";
    width: 100%;
    display: block;
    height: 3px;

    position: absolute;
    background: #fff;
    z-index: 1;
    left: 0;
    transition: transform .2s linear;
}
.nav-toggle_item:before{
    top: -8px;
}
.nav-toggle_item:after{
    bottom: -8px;
}
.nav-toggle.active .nav-toggle_item:before{
    transform-origin: left top;
    transform: rotate(45deg)
    translateY(-3px);
}
.nav-toggle.active .nav-toggle_item:after{
    transform-origin: left bottom;
    transform: rotate(-45deg)
    translate3d(0, 2px, 0);
}

/* Nav */
.nav {
    font-size: 16px;
    font-weight: 400;
    display: block;
}
.nav_link {
    display: inline-block;
    vertical-align: top;
    margin: 10px 20px;

    position: relative;
    color: white;
    text-decoration: none;

    transition: color 0.3s linear;
}
.nav_link:hover {
    color: crimson;
}


/* Main Header */

.main-header {
    font-weight: 900;
    position: relative;
}
.main-header::after {
    content: "";
    position: absolute;
    z-index: 5;
    width: 100%;
    height: calc(var(--index) * 10);
    background-image: url(../images/paralax/ground.png);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    bottom: calc(var(--index) * -4.5);
}
.layers {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.layer {
    height: 100%;
    width: 100%;
    position: absolute;
    background-size: cover;
    background-position: center;
    will-change: transform;
    z-index: 2;
    transition: var(--transition);
}
.layers__base {
    transform: translate3d(0, calc(var(--scrollTop) / 1.6), 0);
    z-index: 0;
}
.layers__middle {
    transform: translate3d(0, calc(var(--scrollTop) / 2.5), 0);
}
.layers__front {
    transform: translate3d(0, calc(var(--scrollTop) / 5.7), 0);
}
.layer__header {
    padding-bottom: 20px;
    z-index: 1;
    transform: translate3d(0, calc(var(--scrollTop) / 2), 0);
    will-change: transform;
    color: #e7e7e0;
    text-shadow: 0 0 20px #9e7d35;
    transition: var(--transition);
}
.layers__title {
    font-size: calc(var(--index) * 1.5);
    /*letter-spacing: calc(var(--index) / 2.25);*/
}
.layers__caption {
    font-size: calc(var(--index) * 1.1);
    /*letter-spacing: calc(var(--index) / 3.5);*/
}

/* Main Article*/

.main-article {
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    color: #e7e7e0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    margin-top: -30px;
}
.main-article::after {
    content: "";
    position: absolute;
    top: 99%;
    z-index: 5;
    width: 100%;
    min-height: 150px;
    background-image: url(../images/demo/stal.png);
    background-size: contain;
    background-repeat: repeat-x;
    background-position: top center;
    overflow: hidden;
}
.container {
    position: relative;
    width: 100%;
    max-width: 1230px;
    padding: 0 15px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
}
.main-article__text {
    transform: translate3d(0, calc(var(--scrollTop) / -15), 0);
    will-change: transform;
    transition: var(--transition);
}
.main-article__header {
    font-size: calc(var(--index) * 1.5);
    /*letter-spacing: calc(var(--index) / 2.25);*/
    opacity: 1;
}
.main-article__paragraph {
    font-size: calc(var(--index) * 0.7);
   /* max-width: 40%;*/
    max-width: calc(var(--index) * 20);
    opacity: 1;
}
.read_btm {
    display: inline-block;
    width: 200px;
    height: 46px;
    border: 2px solid #000;
    background: #000;
    border-radius: 25px/23px;
    transition: background-color .2s linear;

    position: absolute;
    margin-top: 35px;
    left: 20%;

    text-decoration: none;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: .05em;
    color: #fff;
}
.read_btm:hover{
    background-color: #292929;
}

/* Slider */

.main-article__slider {
    max-width: 350px;
    background: radial-gradient(circle at 50% 65%, wheat 0, transparent 39%);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
.slider{
    margin-top: 70px;
    position: relative;
}
.slider__item{
    width: 250px;
    height: 450px;
    margin: 0 30px;
    position: relative;
    display: inline-block;
    text-align: center;
    opacity: .9;
}
.slider__item--first{
    background: url("../images/slider/1-1.png")
    center no-repeat;
    background-size: cover;
}
.slider__item--second{
    background: url("../images/slider/2-2.png")
    center no-repeat;
    background-size: cover;
}
.slider__item--third{
    background: url("../images/slider/3-3.png")
    center no-repeat;
    background-size: cover;
}
.slick-track{
    display: flex;
}
.slick-list{
    overflow: hidden;
}
.slick-dots{
    display: flex;
    align-items: center;
    justify-content: center;
}
.slick-dots li{
    list-style: none;
    margin: 0 10px;
}
.slick-dots button{
    font-size: 0;
    width: 15px;
    height: 15px;
    background-color: #000;
    border-radius: 10px;
    border: 1px solid #000;

    transition: background-color .1s linear;
}
.slick-dots li.slick-active button{
    background-color: #e7e7e0;
}
.slick-arrow{
    position: absolute;
    top:50%;
    z-index: 1;
    font-size: 0;
    width: 40px;
    height: 40px;
    border: none;
}
.slick-arrow:hover {
    cursor: pointer;
}
.slick-arrow.slick-prev{
    left: -30px;
    background: url(../images/slider/leftarrow.svg) 0 0 / 100% no-repeat;
}
.slick-arrow.slick-next{
    background: url(../images/slider/rightnarrow.svg)  0 0 / 100% no-repeat;
    right: -30px;
}

/* Demo */

.demo {
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    color: #e7e7e0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.demo::after,
.features::before {
    content: "";
    position: absolute;
    z-index: 5;
    width: 100%;
    min-height: 150px;
    background-image: url(../images/demo/stal_doouble.png);
    background-size: contain;
    background-repeat: repeat-x;
    background-position: top center;
}
.demo::after {
    top: 98%;
}
.screen {
    width: 300px;
    border: 3px solid rgba(var(--primary-rgb), 80%);
    aspect-ratio: 10 / 16;
    border-radius: 1rem;
    background-color: rgba(var(--primary-rgb), 15%);
    overflow: hidden;
    position: relative;
}
.screen-overlay {
    background: linear-gradient(
            rgba(var(--primary-rgb), 15%),
            rgba(var(--primary-rgb), 15%) 3px,
            transparent 3px,
            transparent 9px
    );
    background-size: 100% 9px;
    height: 100%;
    width: 100%;
    animation: pan-overlay 22s infinite linear;
    position: absolute;
    z-index: 2;
    left: 0;
    top: 0;
}
@keyframes pan-overlay {
    from {
        background-position: 0 0;
    }

    to {
        background-position: 0 -100%;
    }
}
.screen .screen-image {
    position: absolute;
    background-image: url("../images/demo/demo.jpg");
    height: 100%;
    width: 100%;
    background-size: 300%;
    filter: sepia(50%) hue-rotate(20deg);
    opacity: .9;
    animation: pan-image 15s linear infinite;
}
@keyframes pan-image {
    0% {
        background-position: 36% 42%;
        background-size: 200%;
    }
    20% {
        background-position: 30% 35%;
        background-size: 200%;
    }

    20.0001% { /* View 2 */
        background-position: 30% 97%;
        background-size: 400%;
    }
    40% {
        background-position: 45% 100%;
        background-size: 400%;
    }

    40.0001% { /* View 3 */
        background-position: 40% 60%;
        background-size: 300%;
    }
    60% {
        background-position: 45% 42%;
        background-size: 300%;
    }

    60.0001% { /* View 4 */
        background-position: 0 0;
        background-size: 300%;
    }
    80% {
        background-position: 15% 4%;
        background-size: 300%;
    }

    80.0001% { /* View 5 */
        background-position: 80% 10%;
        background-size: 300%;
    }
    100% {
        background-position: 70% 3%;
        background-size: 300%;
    }
}
.screen-content {
    position: absolute;
    right: 2%;
    top: 2%;
    height: 95%;
    width: 95%;
    border: 2px solid rgba(var(--primary-rgb), 60%);
    border-radius: 1rem;
}
.screen-content__wrapper{
    padding: 10px;
    object-position: center;
    position: absolute;
    bottom: 0;
    z-index: 3;
}
.chapter_title{
    font-size: 25px;
    font-weight: 700;
}
.chapter_title a{
    text-decoration: none;
    color: #e7e7e0;
}
.chapter_title:before{
    content: "";
    border-bottom: 2px solid #e7e7e0;
    display: block;
    margin-bottom: 15px;
}
.screen-content__wrapper button {
    background: transparent;
    border: 1px solid #e7e7e0;
    border-radius: 17px;
    width: 120px;
    height: 35px;
    transition: background-color .2s linear;
    margin-bottom: 15px;

    text-decoration: none;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    color: #fff;
    letter-spacing: .03em;
    text-align: center;
}
.screen-content__wrapper button:hover{
    background-color: #000;
}
.demo_btm {
    width: 250px;
}
.demo_btm i {
    margin-left: 10px;
}
.demo__text-block {
    padding: 0 10px 2px;
    background: rgba(1, 1, 1, .8);
    border-radius: 1rem;
}
.demo__text {
    margin-top: 15vh;
}

/* Features */

.container__features {
    width: 100%;
    max-width: 1230px;
    margin: 0 auto;
    padding: 0 15px;
}
.features {
    color: #010101;
    background-color: #fff;
    width: 100%;
    min-height: 50vh;
    position: relative;
    margin-top: -50px;
    padding-bottom: 40px;
}
.features::before {
    transform: rotateX(180deg);
    top: -150px;
}
.features_inner .section_header{
    text-align: center;
    margin-top: 40px;
    margin-bottom: 50px;
    font-size: calc(var(--index) * 1.7);
    padding-top: 20vh;
}
.items {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.item {
    flex: 1 1 0;
    width: 33.33%;
    padding-left: 90px;
    padding-right: 30px;
    position: relative;
}
.item_icon {
    position: absolute;
    top: 1%;
    left: 0;
    z-index: 1;
    width: 65px;
    height: 65px;
}
.item_header {
    font-weight: 700;
    line-height: 1.3;
    font-size: calc(var(--index) * 1.1);
}
.item_text{
    font-weight: 400;
    font-size: calc(var(--index) * 0.7);
    max-width: calc(var(--index) * 20);
}
.features__image {
    background-color: #fff;
    min-height: 500px;
    width: 100%;
    background-size: cover;
    position: relative;
}
.features__image__before,
.features__image__after {
    z-index: 2;
    content: "";
    position: absolute;
    width: 100%;
    height: 150px;
    background-image: url("../images/features/intro_line.png");
    background-size: cover;
    background-repeat: no-repeat;
    background-position: top center;
}
.features__image__before {
    left: 0;
    top: -30px;
    transform: rotateX(180deg);
}
.features__image__after {
    left: 0;
    bottom: -5px;
}

/* Team */

.team {
    background-color: #fff;
    min-height: 650px;
}
.box_wrapper {
    width: 100%;
}
.boxes {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.box {
    display: flex;
    flex-wrap: wrap;
}
.team_box {
    margin: 10px;
    position: relative;
    width: 294px;
    height: 294px;
    display: inline-block;
    cursor: pointer;
    background-size: cover;
    transition: background-image .25s ease-in-out;
    border: 0 solid #998973;
    /*transition: border-width .25s ease-in-out;*/
    box-sizing: border-box;
}
.team_box__title {
    text-align: center;
    z-index: 5;
    padding: 30px;
}
.team_box__title .name {
    color: #fff;
    font-size: 20px;
    font-weight: 400;
    position: absolute;
    bottom: 70px;
    text-align: center;
    width: 234px;
    margin: 0 auto;
    opacity: 0;
    transition: opacity .25s ease-in-out .25s;
}
.team_box:hover .name{
    opacity: 1;
}
.team_box__title .post {
    color: #fff;
    font-size: 14px;
    position: absolute;
    font-weight: 400;
    top: 238px;
    opacity: 0;
    transition: opacity .25s ease-in-out .25s;
    margin: 0 auto;
    text-align: center;
    width: 234px;
}
.team_box:hover .post {
    opacity: 1;
}
.team_box__line {
    position: absolute;
    top: 0;
    left: 0;
    width: 294px;
    height: 294px;
    z-index: 4;
    border: 0 solid #998973;
    transition: border-width .25s ease-in-out;
}
.team_box__line:hover {
    border-width: 15px;
}
.team_box__title .line {
    position: absolute;
    top: 230px;
    content: "";
    width: 234px;
    border-bottom: 1px solid #fff;
    transform: scaleX(0);
    transition: all .25s ease-in-out;
}
.team_box:hover .line {
    transform: scaleX(1);
}
.box_maxim {
    background-image: url("../images/team/maxim1.jpg");
}
.box_maxim:hover {
    background-image: url("../images/team/maxim2.jpg");
}
.box_anton{
    background-image: url("../images/team/anton1.jpg");
}
.box_anton:hover {
    background-image: url("../images/team/anton2.jpg");
}
.box_cat {
    background-image: url("../images/team/sever1.jpg");
}
.box_cat:hover {
    background-image: url("../images/team/sever2.jpg");
}
.team_header {
    margin: 0 auto;
    padding: 50px 0 30px;
    text-align: center;
    width: 100%;
    max-width: 700px;
}
.section_suptitle {
    font-size: calc(var(--index) * 1.1);
    color: #333;
}
.section_title {
    font-size: calc(var(--index) * 1.6);
    font-weight: 700;
    color: #010101
}
.section_title:after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: #f38181;
    margin: 30px auto;
}

/* Footer */

.footer {
    width: 100%;
    min-height: 675px;
    background-size: cover;
    position: relative;
}
.footer-wrapper {
    padding-top: 20%;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;

}
.read_form__footer {
    display: inline-block;
    width: 100%;
    align-content: center;
    text-align: center;
}
.footer_btm {
    display: inline-block;
    width: 330px;
    height: 50px;
    border: 2px solid #000;
    background: #000;
    border-radius: 25px/23px;
    transition: background-color .2s linear;

    position: relative;

    text-decoration: none;
    font-size: 24px;
    font-weight: 600;
    line-height: 1.55;
    color: #fff;
}
.footer_btm__pdf {
    margin-bottom: 15px;
}
.footer_btm__epub {

}
.footer_btm:hover{
    background-color: #292929;
}
.footer:before {
    z-index: 2;
    content: "";
    position: absolute;
    width: 100%;
    height: 150px;
    background-image: url("../images/features/intro_line.png");
    background-size: cover;
    background-repeat: no-repeat;
    background-position: top center;
    left: 0;
    top: -30px;
    transform: rotateX(180deg);
}





/* Media requests */

@media (max-width: 1280px) {
    .nav{
        display: block;
    }
}


@media (max-width: 990px) {

    /* Intro */
    .layer__header {
        padding-bottom: 30px;
    }
    .layers__title, .section_title {
        font-size: calc(var(--index) * 1.8);
        /*letter-spacing: calc(var(--index) / 2.25);*/
    }
    .layers__caption, .section_suptitle {
        font-size: calc(var(--index) * 1.3);
        /*letter-spacing: calc(var(--index) / 3.5);*/
    }

    /* Demo */
    .main-article__header {
        font-size: calc(var(--index) * 1.7);
    }
    .main-article__paragraph {
        font-size: calc(var(--index) * 0.8);
        max-width: calc(var(--index) * 22);
    }

    /* Team */

    /*  Features  */
    .features_inner .section_header{
        font-size: calc(var(--index) * 2.3);
    }
    .item {
        width: 50%;
    }
    .item_header {
        font-size: calc(var(--index) * 1.5);
    }
    .item_text {
        font-size: calc(var(--index) * 1.1);
        max-width: 90%;
    }

    /*  Footer  */
    .footer:before {
        top: -3px;
    }
}


@media (max-width: 770px) {

    /* Nav */
    .nav{
        display: none;
        position: absolute;
        top:100%;
        left:0;
        /*display: block;*/
        width: 100%;
        background: #000;
    }
    .nav.active{
        display: block;
    }
    .nav_link{
        display: block;
        margin: 0;
        padding: 8px 20px;
        font-size: 16px;
    }
    .nav-toggle{
         display: block;
         background: transparent;
         font-size: 0;
         border: none;
     }
    .slider {
        margin-top: 0;
    }

    /* Intro */
    .layers__title {
        font-size: calc(var(--index) * 2.2);
        /*letter-spacing: calc(var(--index) / 2.25);*/
    }
    .layers__caption {
        font-size: calc(var(--index) * 1.6);
        /*letter-spacing: calc(var(--index) / 3.5);*/
    }

    /* Main */
    .slider {
        margin-bottom: 8vh;
    }
    .container__slider {
        flex-wrap: wrap-reverse;
    }
    .slider__item {
        width: 270px;
        height: 486px;
    }
    .slick-arrow{
        width: 35px;
        height: 35px;
    }
    .slick-arrow.slick-prev{
        left: -20px;
    }
    .slick-arrow.slick-next{
        right: -20px;
    }

    /* Demo */
    .main-article__text {
        margin-top: 22vh;
    }
    .main-article__header {
        font-size: calc(var(--index) * 1.9);
    }
    .main-article__paragraph {
        font-size: calc(var(--index) * 0.9);
    }
    .read_form {
        margin-bottom: 5vh;
    }
    .screen__wrapper {
        margin-bottom: 5vh;
    }
    .read_form__main {
        margin-bottom: 15vh;
    }
    .demo_btm {
        width: 220px;
    }
    .demo_btm i {
        display: none;
    }
    .demo::after {
        top: 98.5%;
    }

    /* Team */
    .section_title {
        font-size: calc(var(--index) * 2.9);
    }
    .section_suptitle {
        font-size: calc(var(--index) * 1.9);
    }

    /*  Features  */
    .features_inner .section_header{
        font-size: calc(var(--index) * 2.8);
        padding-top: 15vh;
    }
    .item {
        width: 100%;
        padding-left: 70px;
        flex: none;
        margin-left: 20px;
        margin-bottom: 20px;
    }
    .item_icon {
        width: 55px;
        height: 55px;
    }
    .item_header {
        font-size: calc(var(--index) * 1.8);
    }
    .item_text {
        font-size: calc(var(--index) * 1.3);
    }
    .features::before {
        top: -147px;
    }

    /*  Footer  */
    .footer-wrapper {
        padding-top: 30%;
    }
    .read_form__footer {
        margin-bottom: 10px;
    }
    .footer:before {
        height: 200px;
        top: -11px;
    }
}


@media (max-width: 575px) {

    /* Nav */
    .nav{
        display: none;
    }
    .nav-toggle{
        display: block;
    }

    .header_logo{
        font-size: 26px;
    }
    .nav.active{
        display: block;
    }

    /* Intro */
    .layers__title {
        font-size: calc(var(--index) * 2.2);
        /*letter-spacing: calc(var(--index) / 2.25);*/
    }
    .layers__caption {
        padding-bottom: 2px;
        font-size: calc(var(--index) * 1.9);
        /*letter-spacing: calc(var(--index) / 3.5);*/
    }

    /* Demo */
    .main-article__text {
        margin-top: 25vh;
    }
    .main-article__header {
        font-size: calc(var(--index) * 2.5);
    }
    .main-article__paragraph {
        font-size: calc(var(--index) * 1.4);
        max-width: calc(var(--index) * 30);
    }
    .screen__wrapper {
        margin-bottom: 15vh;
    }
    .demo::after {
        top: 99%;
    }

    /* Main */
    .slider__item {
        width: 180px;
        height: 324px;
        margin: 0 45px;
    }
    .slick-arrow{
        width: 25px;
        height: 25px;
    }
    .slick-arrow.slick-prev{
        left: 30px;
    }
    .slick-arrow.slick-next{
        right: 30px;
    }

    /*  Team  */
    .team_header {
        padding: 25px 0 15px;
    }
    .section_title {
        font-size: calc(var(--index) * 3.3);
    }
    .section_suptitle {
        font-size: calc(var(--index) * 2.2);
    }

    /*  Features  */
    .features_inner .section_header{
        font-size: calc(var(--index) * 3.0);
        padding-top: 10vh;
    }
    .item {
        padding-left: 60px;
        margin-left: 10px;
    }
    .item_icon {
        width: 45px;
        height: 45px;
    }
    .item_header {
        font-size: calc(var(--index) * 2.0);
    }
    .item_text {
        font-size: calc(var(--index) * 1.4);
    }

    /*  Footer  */
    .footer-wrapper {
        padding-top: 40%;
    }
    .read_form__footer {
        margin-bottom: 10px;
    }
}