/* 彩虹背景相关样式 */
body {
    background: linear-gradient(
        135deg, 
        #ff6b6b 0%, 
        #4ecdc4 12.5%, 
        #45b7d1 25%, 
        #96ceb4 37.5%, 
        #feca57 50%, 
        #ff9ff3 62.5%, 
        #54a0ff 75%, 
        #5f27cd 87.5%, 
        #00d2d3 100%
    );
    background-size: 400% 400%;
    animation: rainbowGradient 15s ease infinite;
    background-attachment: fixed;
    min-height: 100vh;
    position: relative;
}

@keyframes rainbowGradient {
    0% {
        background-position: 0% 50%;
    }
    25% {
        background-position: 100% 50%;
    }
    50% {
        background-position: 100% 100%;
    }
    75% {
        background-position: 0% 100%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 彩虹装饰层 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(255, 107, 107, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(78, 205, 196, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(69, 183, 209, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 60% 20%, rgba(150, 206, 180, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 80% 40%, rgba(254, 202, 87, 0.1) 0%, transparent 35%);
    pointer-events: none;
    z-index: -1;
    animation: float 20s ease-in-out infinite alternate;
}

/* 彩虹粒子效果 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 10% 10%, rgba(255, 107, 107, 0.8) 2px, transparent 2px),
        radial-gradient(circle at 30% 20%, rgba(78, 205, 196, 0.8) 1.5px, transparent 1.5px),
        radial-gradient(circle at 50% 30%, rgba(69, 183, 209, 0.8) 1px, transparent 1px),
        radial-gradient(circle at 70% 40%, rgba(150, 206, 180, 0.8) 2px, transparent 2px),
        radial-gradient(circle at 90% 50%, rgba(254, 202, 87, 0.8) 1.5px, transparent 1.5px),
        radial-gradient(circle at 20% 60%, rgba(255, 159, 243, 0.8) 1px, transparent 1px),
        radial-gradient(circle at 40% 70%, rgba(84, 160, 255, 0.8) 2px, transparent 2px),
        radial-gradient(circle at 60% 80%, rgba(95, 39, 205, 0.8) 1.5px, transparent 1.5px),
        radial-gradient(circle at 80% 90%, rgba(0, 210, 211, 0.8) 1px, transparent 1px);
    background-size: 200px 200px, 250px 250px, 180px 180px, 300px 300px, 220px 220px, 160px 160px, 280px 280px, 240px 240px, 200px 200px;
    animation: sparkle 25s linear infinite;
    pointer-events: none;
    z-index: -1;
    opacity: 0.6;
}

@keyframes float {
    0% {
        transform: translateY(0px) rotate(0deg);
    }
    100% {
        transform: translateY(-15px) rotate(2deg);
    }
}

@keyframes sparkle {
    0%, 100% {
        transform: translateX(0) translateY(0) scale(1);
    }
    25% {
        transform: translateX(-10px) translateY(-5px) scale(1.1);
    }
    50% {
        transform: translateX(10px) translateY(-10px) scale(0.9);
    }
    75% {
        transform: translateX(-5px) translateY(-15px) scale(1.05);
    }
}