/* 闪烁星星效果 CSS */
.twinkling-stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.twinkling-star {
    position: absolute;
    background: white;
    border-radius: 50%;
    animation: twinkle 3s infinite ease-in-out;
}

@keyframes twinkle {
    0%, 100% { 
        opacity: 0.3; 
        transform: scale(1); 
    }
    50% { 
        opacity: 1; 
        transform: scale(1.2); 
    }
}

/* 不同大小的星星 */
.twinkling-star.small {
    width: 1px;
    height: 1px;
    box-shadow: 0 0 6px white;
}

.twinkling-star.medium {
    width: 2px;
    height: 2px;
    box-shadow: 0 0 8px white;
}

.twinkling-star.large {
    width: 3px;
    height: 3px;
    box-shadow: 0 0 10px white;
}

/* 流星 */
.shooting-star {
    position: absolute;
    left: 0;
    top: 0;
    width: var(--meteor-length, 140px);
    height: 2px;
    opacity: 0;
    pointer-events: none;
    transform: translate3d(var(--start-x), var(--start-y), 0) rotate(var(--meteor-angle, 28deg));
    transform-origin: left center;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.5) 70%,
        rgba(255, 255, 255, 0.98) 100%
    );
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.9));
    will-change: transform, opacity;
    animation: meteor-fly var(--meteor-duration, 1200ms) cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

.shooting-star::before {
    content: '';
    position: absolute;
    right: -2px;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    transform: translateY(-50%);
    background: radial-gradient(circle, rgba(255, 255, 255, 1) 0%, rgba(255, 255, 255, 0.35) 70%, rgba(255, 255, 255, 0) 100%);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.95);
}

@keyframes meteor-fly {
    0% {
        opacity: 0;
        transform: translate3d(var(--start-x), var(--start-y), 0) rotate(var(--meteor-angle, 28deg));
    }
    10% {
        opacity: 1;
    }
    75% {
        opacity: 0.9;
    }
    100% {
        opacity: 0;
        transform: translate3d(
            calc(var(--start-x) + var(--travel-x)),
            calc(var(--start-y) + var(--travel-y)),
            0
        ) rotate(var(--meteor-angle, 28deg));
    }
}