* {
    margin: 0;
    padding: 0;
    bottom: none;
    box-sizing: border-box;
}
:root {
    --index: calc(1vw + 1vh);
    --gutter: 30px;
    --side-small: 26;
    --side-big: 36;
    --depth: 4000px;
    --transition: .75s cubic-bezier(.075, .5, 0, 1 )
}
@font-face {
    font-family: raleway_c;
    src: url(../fonts/raleway-v22-cyrillic-300.woff2);
    font-weight: 300;
}
@font-face {
    font-family: raleway_c;
    src: url(../fonts/raleway-v22-cyrillic-100.woff2);
    font-weight: 100;
}
body {
    font-size: calc(var(--index) * .8);
    font-family: raleway_c, sans-serif;
    font-weight: 300;
    height: var(--depth);
    line-height: 1.75;
    color: #fff;
    background-color: #000;
}

.container {
    width: 100%;
    height: 100%;
    /* для управления по z оси */
    position: fixed;
    /* обязательно нужно использовать, если хотим работать по z оси */
    perspective: 1500px;
}
.gallery {
    height: 100%;
    transform-style: preserve-3d;
}
.frame {
    width: 100%;
    height: 100%;
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center ;   
    transition: var(--transition), opacity .75s ease;
    will-change: transform;
    transform-style: preserve-3d;
}
h1, h2, h3, h4 {
    width: min-content;
    font-weight: 100;
    line-height: 1;
    text-transform: uppercase;
}
.frame h2 {
    text-align: center;
    font-size: calc(var(--index) * 3.3);
}
.frame-media {
    position: relative;
    width: calc(var(--index) * var(--side-small));
    height: calc(var(--index) * var(--side-big));
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.frame-media__left {
    right: calc(var(--side-small) / 2 * var(--index) + var(--gutter));
}
.frame-media__right {
    left: calc(var(--side-small) / 2 * var(--index) + var(--gutter));
}
.frame_bg {
    background-color: rgb(0 0 0 / .87);
}
video.frame-media {
    width: calc(var(--index) * var(--side-big));
    height: calc(var(--index) * var(--side-small));   
}
video.frame-media__right {
    width: calc(var(--index) * var(--side-big));
    left: calc(var(--side-big) / 2 * var(--index) + var(--gutter));
}
video.frame-media__left {
    width: calc(var(--index) * var(--side-big));
    right: calc(var(--side-big) / 2 * var(--index) + var(--gutter));
}
.text-right > * {
    position: relative;
    left: 20vw;
}
.text-left > * {
    position: relative;
    right: 20vw;
}
.frame h3 {
    font-size: calc(var(--index) * 3);
}
.frame p {
    max-width: 30vw;
    margin-top: 3vh;
}
.soundbtn {
    position: fixed;
    bottom: 5vh;
    right: 5vw;
    width: 24px;
    cursor: pointer;
    transition: .25s ease;
}
.soundbtn.paused {
    opacity: .25;
}