/* 全局样式 */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}