/* 加载动画 */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s, visibility 0.5s;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    width: 80px;
    height: 80px;
    position: relative;
}

.loader-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top-color: #00ffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-ring:nth-child(2) {
    border-top-color: #ff00ff;
    animation-delay: 0.3s;
}

.loader-ring:nth-child(3) {
    border-top-color: #ffff00;
    animation-delay: 0.6s;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.loading-text {
    margin-top: 30px;
    font-size: 18px;
    color: #00ffff;
    font-weight: 600;
    animation: pulse 1.5s ease-in-out infinite;
}

.loading-progress {
    margin-top: 20px;
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.loading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #00ffff, #ff00ff, #ffff00);
    background-size: 200% 100%;
    animation: progressMove 2s linear infinite;
    width: 0%;
    transition: width 0.3s;
}

@keyframes progressMove {
    0% {
        background-position: 0% 0%;
    }
    100% {
        background-position: 200% 0%;
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}