/* 加载等待样式 */
 .loading-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-text {
    margin-top: 20px;
    font-size: 16px;
    color: #333;
    text-align: center;
}

/* 淡入淡出效果 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.fade-out {
    animation: fadeOut 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* 进度条样式 */
.progress-bar {
    width: 200px;
    height: 4px;
    background-color: #f0f0f0;
    border-radius: 2px;
    margin-top: 15px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: #3498db;
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 2px;
}

/* 加载点动画 */
.loading-dots {
    display: inline-block;
}

.loading-dots::after {
    content: '';
    animation: dots 1.5s steps(5, end) infinite;
}

@keyframes dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}