/* Black canvas with restrained contour lines in the upper half of the viewport. */
body.inside{position:relative;min-height:100vh;background:#080809}
body.inside::before{
 content:'';position:fixed;z-index:-1;inset:0 0 auto;height:50vh;pointer-events:none;
 background-color:transparent;
 background-image:radial-gradient(ellipse at 78% 0%,rgba(106,38,63,.13),transparent 66%),url('assets/portal-contours.svg');
 background-position:center,center top;background-size:cover,cover;background-repeat:no-repeat;background-attachment:scroll;
 -webkit-mask-image:linear-gradient(#000 0%,#000 30%,transparent 100%);
 mask-image:linear-gradient(#000 0%,#000 30%,transparent 100%);
}
@media(prefers-reduced-motion:reduce){body.inside::before{position:absolute}}