gba(255,255,255,0.2);
        }

        .toggle-thumbnails:hover {
            background: rgba(0,0,0,0.9);
        }

        .loading-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255,255,255,0.9);
            display: none; /* 默认隐藏，避免初始闪烁 */
            justify-content: center;
            align-items: center;
            border-radius: 15px;
            z-index: 10;