.space-sky {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
    background: transparent;
}
.space-sky span {
    position: absolute;
    top: -8vh;
    width: 2px;
    height: 2px;
    background: #fff;
    border-radius: 50%;
    opacity: 0.7;
    animation: star-fall linear infinite;
    box-shadow: 0 0 6px rgba(255,255,255,.4);
}
html[data-theme="light"] .space-sky span {
    background: #7c3aed;
    opacity: 0.28;
    box-shadow: 0 0 6px rgba(124,58,237,.2);
}
.space-sky span.star-bright { width: 3px; height: 3px; }
@keyframes star-fall {
    0% { transform: translateY(-10vh); opacity: 0; }
    12% { opacity: 1; }
    100% { transform: translateY(110vh); opacity: .15; }
}