:root {
  --index: calc(1vw + 1vh);
  --gutter: 30px;
  --side-small: 26;
  --side-big: 36;
  --depth: 6000px;
  --transition: .3s cubic-bezier(.075, .5, 0, 1);
}

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

body {
  height: var(--depth);
  background-color: #000;
  color: #fff;
  font-family: Raleway_c, sans-serif;
  font-size: calc(var(--index) * .8);
  font-weight: 300;
  line-height: 1.75;
  scrollbar-width: none; /* Firefox hide scrollbar*/
}
body::-webkit-scrollbar {
  display: none; /* Safari and Chrome hide scrollbar*/
  height: 100vh;
}

h1, h2, h3, h4 {
  font-weight: 100;
  text-transform: uppercase;
}

.container {
  position: fixed;
  width: 100%;
  height: 100%;
  perspective: 1500px;
}

.gallery {
  transform-style: preserve-3d;
  height: 100%;
}

.frame {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: var(--transition), opacity .3s ease;
  will-change: transform;
  transform-style: preserve-3d;
}

.frame__title {
  width: min-content;
  text-align: center;
  font-size: calc(var(--index) * 3);
}

.frame__description {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: calc(var(--index) * var(--side-small));
  height: calc(var(--index) * var(--side-big));
}
.frame__header {
  text-align: center;
  font-size: calc(var(--index) * 2);
}
.frame__text {
  padding-top: 2vh;
  font-size: calc(var(--index) * 1.1);
}

.frame__media {
  position: relative;
  width: calc(var(--index) * var(--side-small));
  height: calc(var(--index) * var(--side-big));
  background-position: center;
  background-size: cover;
}
.frame__media--large {
  width: calc(var(--index) * var(--side-big));
  height: calc(var(--index) * var(--side-small));
}
.frame__media--left {
  right: calc(var(--index) * var(--side-small) / 2 + var(--gutter));
}
.frame__media--right {
  left: calc(var(--index) * var(--side-small) / 2 + var(--gutter));
}

.frame__media--large {
  width: calc(var(--index) * var(--side-big));
  height: calc(var(--index) * var(--side-small));
}
.frame__media--large.frame__media--left {
  right: calc(var(--index) * var(--side-big) / 2 + var(--gutter));
}
.frame__media--large.frame__media--right {
  left: calc(var(--index) * var(--side-big) / 2 + var(--gutter));
}

.frame--bg {
  background-color: rgba(0, 0, 0, .5);
}

/*Footer*/
.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 7vh;
}

.footer__content {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: calc(var(--index) * 1.1);
  color: #555;
  text-align: center;
}
.footer__link {
  color: #555;
  transition: text-shadow.3s ease;
}
.footer__link:hover {
  text-shadow: 0 0 5px #777;
}
.sound-btn {
  width: 30px;
  margin: 0 15px;
  cursor: pointer;
  transition: opacity .5 ease;
}
.sound-btn.paused {
  opacity: .25;
}