/* Starfield background */
.starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: black;
    z-index: -1;
    overflow: hidden;
}

.star {
    position: absolute;
    background: white;
    border-radius: 50%;
    opacity: 0.5;
    animation: twinkle 2s infinite;
}

@keyframes twinkle {
    0% { opacity: 0.2; }
    50% { opacity: 0.8; }
    100% { opacity: 0.2; }
}