body { isolation: isolate; }
.site-background { position: fixed; inset: 0; z-index: 0; pointer-events: none; background: #081425 url("images/bg.png") center / cover no-repeat; }
.site-background video { display: block; width: 125%; height: 125%; object-fit: cover; opacity: 1; }
.site-background video[hidden] { display: none; }
.site-background::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg,rgba(8,20,37,.42),rgba(8,20,37,.8)); }
body > header, body > main, body > footer { position: relative; z-index: 1; }
@media (prefers-reduced-motion: reduce) { .site-background video { display: none; } }