/* Pure CSS Starry Sky */

@keyframes animStar {
    from { transform: translateY(0px); }
    to { transform: translateY(-2000px); }
}

.stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    background: radial-gradient(ellipse at bottom, #1B2735 0%, #090A0F 100%);
    opacity: 1;
}

/* 星星图层 */
.stars, .stars2, .stars3 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

/* 优化版星星 - 平衡效果和性能 */
.stars {
    width: 1px;
    height: 1px;
    background: transparent;
    box-shadow: 137px 1503px #FFF, 1749px 133px #FFF, 1598px 1033px #FFF, 1399px 1823px #FFF, 1534px 1290px #FFF;
    animation: animStar 50s linear infinite;
    transform: translateZ(0);
    will-change: transform;
}

.stars2 {
    width: 2px;
    height: 2px;
    background: transparent;
    box-shadow: 1598px 1033px #FFF, 1399px 1823px #FFF, 1534px 1290px #FFF;
    animation: animStar 100s linear infinite;
    transform: translateZ(0);
    will-change: transform;
}

.stars3 {
    width: 3px;
    height: 3px;
    background: transparent;
    box-shadow: 114px 131px #FFF, 1197px 1124px #FFF;
    animation: animStar 150s linear infinite;
    transform: translateZ(0);
    will-change: transform;
}