* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

@font-face {
    font-family: raleway;
    src: url('../fonts/raleway-regular.woff2');
}

@font-face {
    font-family: raleway;
    src: url('../fonts/raleway-black.woff2');
    font-weight: 900;
}

:root {
    --index: calc(1vw + 1vh);
    --text: #e7e3d0;
    --transition: transform .75s cubic-bezier(.075, .5, 0, 1);
}

.body {
    background-color: #131313;
    font-family: raleway, sans-serif;
    line-height: 1.5;
}

.container {
    will-change: transform;
}

.header {
    position: relative;
}

.header::after {
    content: '';
    position: absolute;
    bottom: calc(var(--index) * -4.8);
    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;
}

.layers {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.layer {
    position: absolute;
    z-index: 2;
    height: 100%;
    width: 100%;
    background-size: cover;
    background-position: center;
    will-change: transform;
    transition: var(--transition);
}

.layers__base {
    transform: translate3d(0, calc(var(--scrollTop) / 1.5), 0);
    z-index: 0;
}

.layers__middle {
    transform: translate3d(0, calc(var(--scrollTop) / 2.5), 0);
}

.layers__front {
    transform: translate3d(0, calc(var(--scrollTop) / 5), 0);
}

.layers__title {
    font-size: calc(var(--index) * 1.5);
    letter-spacing: calc(var(--index) / 2.5);
}

.layers__caption {
    font-size: calc(var(--index) / 1.5);
    letter-spacing: calc(var(--index) / 5);
    margin-top: calc(var(--index) * -1);
}

.layer__header {
    z-index: 1;
    transform: translate3d(0, calc(var(--scrollTop) / 2), 0);
    will-change: transform;
    font-weight: 900;
    text-transform: uppercase;
    color: var(--text);
    text-shadow: 0 0 15px #9e9e35;
    transition: var(--transition);

}

.article {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    color: var(--text);
}

.article__heading {
    font-size: calc(var(--index) * 1.25);
    letter-spacing: calc(var(--index) / 2);
    text-transform: uppercase;
    text-align: center;
    transform: translate3d(0, calc(var(--scrollTop) / 7.5), 0);
    will-change: transform;
    transition: var(--transition);

}

.article__text {
    max-width: calc(var(--index) * 30);
    margin-top: calc(var(--index));
    font-size: calc(var(--index) * .6);
    text-align: center;
    transform: translate3d(0, calc(var(--scrollTop) / 7.5), 0);
    will-change: transform;
    transition: var(--transition);

}