.fu-tool-content {
            background-color: var(--bg-color);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            /*padding: 30px;*/
            margin-bottom: 40px;
        }
        /* 外部工具iframe特定样式 */
        .fu-external-tool-container {
            width: 100%;
            height: 600px;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            overflow: hidden;
        }
        
        .fu-external-tool-frame {
            width: 100%;
            height: 100%;
            border: none;
        }
        .fu-tool-loading {
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100%;
            background-color: #f9f9f9;
        }
        
        .fu-spinner {
            width: 40px;
            height: 40px;
            border: 4px solid rgba(0, 0, 0, 0.1);
            border-radius: 50%;
            border-left-color: var(--primary-color);
            animation: spin 1s linear infinite;
        }
        /* 响应式调整 */
        @media (max-width: 768px) {
            .fu-tool-content {
            
                padding: 0px;
                margin-bottom: 20px;
            }
        }