/* 优化的简化星空动画 - 符合物理规律，持续单向流动 */
@keyframes starry-flow-simple {
    0% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(20px, -10px) rotate(1deg); }
    50% { transform: translate(40px, -20px) rotate(2deg); }
    75% { transform: translate(60px, -30px) rotate(3deg); }
    100% { transform: translate(80px, -40px) rotate(4deg); }
}

@keyframes twinkle-simple {
    0% { opacity: 0.1; }
    10% { opacity: 0.3; }
    25% { opacity: 0.6; }
    50% { opacity: 0.8; }
    75% { opacity: 0.5; }
    90% { opacity: 0.3; }
    100% { opacity: 0.1; }
}

/* 流星划过效果 */
.shooting-star {
    position: absolute;
    width: 3px;
    height: 80px;
    background: linear-gradient(to bottom, 
        transparent 0%, 
        rgba(229, 160, 192, 0.6) 10%,
        rgba(255, 255, 255, 1) 30%,
        rgba(229, 160, 192, 0.8) 50%,
        rgba(255, 255, 255, 0.9) 70%,
        rgba(229, 160, 192, 0.4) 90%,
        transparent 100%);
    border-radius: 50%;
    box-shadow: 
        0 0 15px rgba(229, 160, 192, 1),
        0 0 30px rgba(255, 255, 255, 0.8),
        0 0 50px rgba(229, 160, 192, 0.6);
    /* animation: shooting-star 25s linear infinite; - 移至JS动态控制 */
    transform: rotate(-45deg);
    transform-origin: top left;
    opacity: 0;
    will-change: transform, opacity;
    pointer-events: none;
}

@keyframes shooting-star {
    0% {
        transform: translateX(0) translateY(0) rotate(-45deg);
        opacity: 0;
    }
    5% {
        opacity: 1;
    }
    95% {
        opacity: 1;
    }
    100% {
        transform: translateX(400px) translateY(400px) rotate(-45deg);
        opacity: 0;
    }
}

/* 反向流星划过效果 - 从右上向左下 */
.shooting-star-reverse {
    position: absolute;
    width: 3px;
    height: 80px;
    background: linear-gradient(to bottom, 
        transparent 0%, 
        rgba(229, 160, 192, 0.6) 10%,
        rgba(255, 255, 255, 1) 30%,
        rgba(229, 160, 192, 0.8) 50%,
        rgba(255, 255, 255, 0.9) 70%,
        rgba(229, 160, 192, 0.4) 90%,
        transparent 100%);
    border-radius: 50%;
    box-shadow: 
        0 0 15px rgba(229, 160, 192, 1),
        0 0 30px rgba(255, 255, 255, 0.8),
        0 0 50px rgba(229, 160, 192, 0.6);
    animation: shooting-star-reverse 25s linear infinite;
    transform: rotate(45deg);
    transform-origin: top right;
    opacity: 0;
}

@keyframes shooting-star-reverse {
    0% {
        transform: translateX(0) translateY(0) rotate(45deg);
        opacity: 0;
    }
    2% {
        opacity: 1;
    }
    98% {
        opacity: 1;
    }
    100% {
        transform: translateX(-500px) translateY(500px) rotate(45deg);
        opacity: 0;
    }
}