.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.green-gradient {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        135deg,
        rgba(240, 20, 20, 0.3) 0%,
        rgba(255, 60, 60, 0.2) 25%,
        rgba(255, 100, 100, 0.1) 50%,
        rgba(255, 150, 150, 0.2) 75%,
        rgba(240, 20, 20, 0.3) 100%
    );
    animation: green-flow 20s ease-in-out infinite;
}

.green-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        circle at 30% 70%,
        rgba(255, 45, 45, 0.4) 0%,
        transparent 50%
    ), radial-gradient(
        circle at 70% 30%,
        rgba(255, 100, 100, 0.3) 0%,
        transparent 50%
    );
    animation: green-pulse 15s ease-in-out infinite alternate;
}

@keyframes green-flow {
    0%, 100% {
        transform: rotate(0deg) scale(1);
        opacity: 0.8;
    }
    25% {
        transform: rotate(90deg) scale(1.1);
        opacity: 0.6;
    }
    50% {
        transform: rotate(180deg) scale(0.9);
        opacity: 0.9;
    }
    75% {
        transform: rotate(270deg) scale(1.05);
        opacity: 0.7;
    }
}

@keyframes green-pulse {
    0% {
        transform: scale(1) rotate(0deg);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.2) rotate(180deg);
        opacity: 0.8;
    }
    100% {
        transform: scale(1) rotate(360deg);
        opacity: 0.6;
    }
}

/* 手机端背景优化 */
@media (max-width: 768px) {
    .green-gradient {
        animation-duration: 25s;
    }
    
    .green-gradient::before {
        animation-duration: 18s;
    }
}

/* 减少动画以节省电池 */
@media (prefers-reduced-motion: reduce) {
    .green-gradient,
    .green-gradient::before {
        animation: none;
    }
    
    .green-gradient {
        background: linear-gradient(
            135deg,
            rgba(76, 175, 80, 0.2) 0%,
            rgba(165, 214, 167, 0.1) 50%,
            rgba(200, 230, 201, 0.15) 100%
        );
    }
}