* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --index: calc(1vw + 1vh);
  --textColor: #e7e7e0;
  --transition: transform 0.75s cubic-bezier(0.075, 0.5, 0, 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 {
  background-color: #010101;
  font-family: raleway_f, sans-serif;
  line-height: 1.55;
}
.main_header {
  position: relative;
}
.main_header::after {
  position: absolute;
  z-index: 100;
  content: "";
  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 {
  position: absolute;
  height: 100%;
  width: 100%;
  background-size: cover;
  background-position: center;
  will-change: transform;
  z-index: 2;
}

.layers__base {
  transform: translate3d(0, calc(var(--scrollTop) / 1.7), 0);
  transition: var(--transition);
  z-index: 0;
}
.layers__middle {
  transform: translate3d(0, calc(var(--scrollTop) / 2.7), 0);
  transition: var(--transition);
}
.layers__front {
  transform: translate3d(0, calc(var(--scrollTop) / 5.7), 0);
  transition: var(--transition);
}
.layer__header {
  z-index: 1;
  transform: translate3d(0, calc(var(--scrollTop) / 2), 0);
  transition: var(--transition);
  will-change: transform;
  font-weight: 900;
  color: var(--textColor);
  text-shadow: 0 0 15px #9d822b;
}
.layers__title {
  font-size: calc(var(--index) * 3.2);
  letter-spacing: calc(var(--index) / 2.25);
}

.layers__caption {
  font-size: calc(var(--index) * 1.2);
  letter-spacing: calc(var(--index) / 3.5);
  margin-top: calc(var(--index) * -1);
}
.main_article {
  min-height: 100vh;
  background-size: cover;
  background-position: center;
  color: var(--textColor);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  text-align: center;
}
.main_article__header {
  text-transform: uppercase;
  font-size: calc(var(--index) * 2.5);
  letter-spacing: calc(var(--index) * 0.4);
  transform: translate3d(0, calc(var(--scrollTop) / -7.5), 0);
  transition: var(--transition);
  will-change: transform;
}
.main_article__paragraph {
  max-width: calc(var(--index) * 40);
  font-size: calc(var(--index) * 1.2);
  margin-top: calc(var(--index) / 1.25);
  transform: translate3d(0, calc(var(--scrollTop) / -7.5), 0);
  transition: var(--transition);
  will-change: transform;
}
.copy {
  position: absolute;
  bottom: calc(var(--index) * 2);
  opacity: 0.5;
  font-size: calc(var(--index) * 1.1);
  letter-spacing: calc(var(--index) / 20);
}
.content {
  will-change: transform;
}