/* 网易云音乐特色背景样式 */
body {
    background: linear-gradient(135deg, #2b2b2b 0%, #1e1e1e 50%, #2b2b2b 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    position: relative;
    color: #fff;
}

/* 背景渐变动画 */
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 网易云红色装饰元素 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(236, 65, 65, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(236, 65, 65, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(236, 65, 65, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: -2;
}

/* 音符装饰效果 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(236, 65, 65, 0.4), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(236, 65, 65, 0.3), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(236, 65, 65, 0.4), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(236, 65, 65, 0.3), transparent),
        radial-gradient(2px 2px at 160px 30px, rgba(236, 65, 65, 0.4), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: particleFloat 20s linear infinite;
    pointer-events: none;
    z-index: -1;
    opacity: 0.6;
}

/* 音符浮动动画 */
@keyframes particleFloat {
    0% {
        transform: translateY(0px);
    }
    100% {
        transform: translateY(-100px);
    }
}

/* 音符装饰 */
.music-note {
    position: absolute;
    font-size: 24px;
    color: rgba(236, 65, 65, 0.3);
    animation: floatNote 15s linear infinite;
    z-index: -1;
}

@keyframes floatNote {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.8;
    }
    90% {
        opacity: 0.8;
    }
    100% {
        transform: translateY(-100vh) rotate(360deg);
        opacity: 0;
    }
}

/* 响应式背景调整 */
@media (max-width: 768px) {
    body::after {
        background-size: 150px 75px;
        animation-duration: 25s;
    }
}

@media (max-width: 480px) {
    body::after {
        background-size: 100px 50px;
        animation-duration: 30s;
        opacity: 0.4;
    }
}

/* 高性能模式 - 减少动画 */
@media (prefers-reduced-motion: reduce) {
    body {
        animation: none;
        background: linear-gradient(135deg, #2b2b2b 0%, #1e1e1e 50%, #2b2b2b 100%);
    }
    
    body::after {
        animation: none;
    }
    
    .music-note {
        animation: none;
        display: none;
    }
}