html {
    background-color: var(--color-page);
}

body {
    position: relative;
    min-height: 100vh;
    margin: 0;
    overflow-x: clip;
    color: var(--color-text);
    background-color: var(--color-page);
    isolation: isolate;
}

.page-background {
    position: absolute;
    z-index: 0;
    inset: 0 0 auto;
    width: 100%;
    height: 125rem;
    overflow: hidden;
    pointer-events: none;
}

.page {
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

/* Хедер должен пропускать находящиеся сзади шары. */
.header{
    position: relative;
    z-index: 2;
    background: transparent;
}
.page__main {
    position: relative;
    z-index: 0;
    background: transparent;
}

body > main {
    position: relative;
    z-index: 1;
    isolation: isolate;
}

.element {
    position: relative;
    z-index: 1;
}

.footer {
    position: relative;
    z-index: 3;
    isolation: isolate;
    background-color: var(--brand-violet);
}

.page-background__ball {
    position: absolute;
    width: 60.5rem;
    height: 60.5rem;
    background-color: currentColor;
    filter: blur(165px);
    transform: translate3d(0, 0, 0);
    border-radius: 50%;
}

/* Исходные четыре шара — пропорции и позиции сохранены. */
.page-background__ball--violet-top {
    top: -11rem;
    right: -12rem;
    color: var(--brand-violet);
}

.page-background__ball--blue-left {
    top: 29rem;
    left: -35rem;
    color: var(--brand-blue);
}

.page-background__ball--green-right {
    top: 57rem;
    right: -28rem;
    color: var(--brand-green);
}

.page-background__ball--violet-bottom {
    top: 91rem;
    left: -32rem;
    color: var(--brand-violet);
}

/* Шары, которые ball.js добавляет ниже исходной композиции. */
.page-background__ball--generated {
    top: var(--page-ball-top);
}

.page-background__ball--generated[data-side="left"] {
    left: -32rem;
}

.page-background__ball--generated[data-side="right"] {
    right: -28rem;
}

.page-background__ball--generated[data-color="violet"] {
    color: var(--brand-violet);
}

.page-background__ball--generated[data-color="blue"] {
    color: var(--brand-blue);
}

.page-background__ball--generated[data-color="green"] {
    color: var(--brand-green);
}

.container {
    position: relative;
}

.header {
    position: relative;
    z-index: 2;
}