* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --index: calc(1vw + 1vh);
    --text: #337c11;
    --transition: transform 0.8s ease-in-out;
    /*--transition: transform .75s cubic-bezier(.075, .5, 0, 1);*/
    /*--transition: transform .75s cubic-bezier(.075, .5, .75, 1);*/
}
@font-face {
    font-family: raleway_f;
    src: url(../fonts/raleway-regular.woff2);
}
@font-face {
    font-family: raleway_f;
    src: url(../fonts/raleway-black.woff2);
    font-weight: 900;
}
body {
    font-family: raleway_f, sans-serif;
    background-color: #d7d5d5;
    color: #fff;
    line-height: 1.55;
}

.main-header {
    position: relative;
    background: url(../img/layer-base.png) center/cover; /* Добавляем тот же фон */
}
.main-header::after {
    content: '';
    position: absolute;
    z-index: 100;
    width: 100%;
    height: calc(var(--index) * 10);
    background-image: url(../img/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;
    text-align: 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);
    /*transform: translate3d(0, clamp(0px, calc(var(--scrollTop) / 1.6), 100px), 0);*/
    z-index: 0;
}
.layers__middle {
    transform: translate3d(0, calc(var(--scrollTop) / 3.5), 0);
}
.layers__front {
    transform: translate3d(0, calc(var(--scrollTop) / 5.7), 0);
}
.layers_header {
    z-index: 1;
    transform: translate3d(0, calc(var(--scrollTop) / 2), 0);
    transition: var(--transition);
    will-change: transform;
    text-transform: uppercase;
    font-weight: 900;
    color: var(--text);
    text-shadow: 0 0 15px #c1f835;
}
.layers_caption {
    font-size: calc(var(--index) * 2.5);
    letter-spacing: calc(var(--index) / 4.1);
    margin-top: calc(var(--index) * -9.9);
}
.layers_title {
    font-size: calc(var(--index) * 1.4);
    letter-spacing: calc(var(--index) / 2.5);
}

.main-article {
    --main-article-transform: translate3d(0, calc(var(--scrollTop) / -7.5), 0);
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    text-align: center;
    /*!* Update: *!*/
    /*top: -1px;*/
    /*z-index: 10;*/
}
.main-article_header {
    text-transform: uppercase;
    font-size: calc(var(--index) * 1.8);
    letter-spacing: calc(var(--index) / 7.5);
    transform: var(--main-article-transform);
    transition: var(--transition);
    will-change: transform;
}
.main-article_paragraph {
    max-width: calc(var(--index) * 30);
    font-size: calc(var(--index) * .9);
    margin-top: calc(var(--index) / 1.25);
    transform: var(--main-article-transform);
    transition: var(--transition);
    will-change: transform;
}


.copy {
    position: absolute;
    bottom: calc(var(--index) * 2.5);
    opacity: .45;
    font-size: calc(var(--index) * .75);
    letter-spacing: calc(var(--index) / 37.5);
}