/* 基本響應式設計 */
@media screen and (max-width: 768px) {
    body {
        font-size: 14px;
    }

    header nav ul {
        flex-direction: column;
    }

    header nav ul li {
        margin: 10px 0;
    }
}

/* 表格響應式設計 */
@media screen and (max-width: 600px) {
    table, thead, tbody, th, td, tr {
        display: block;
    }
    
    thead tr {
        position: absolute;
        top: -9999px;
        left: -9999px;
    }
    
    tr {
        margin-bottom: 10px;
    }
    
    td {
        border: none;
        position: relative;
        padding-left: 50%;
    }
    
    td:before {
        position: absolute;
        top: 6px;
        left: 6px;
        width: 45%;
        padding-right: 10px;
        white-space: nowrap;
        content: attr(data-label);
        font-weight: bold;
    }
}

/* 表單響應式設計 */
@media screen and (max-width: 480px) {
    form input[type="file"],
    form button {
        width: 100%;
        margin-bottom: 10px;
    }
}