body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}


/* Simple Tables Bordered Table 样式 */
.table-simple-bordered {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    background-color: transparent;
}

.table-simple-bordered th,
.table-simple-bordered td {
    padding: 0.75rem;
    vertical-align: top;
    border: 1px solid #dee2e6; /* 浅灰色边框 */
}

.table-simple-bordered thead th {
    vertical-align: bottom;
    border-bottom: 2px solid #dee2e6; /* 表头底部边框加粗 */
}

.table-simple-bordered tbody + tbody {
    border-top: 2px solid #dee2e6; /* 表格主体之间的边框 */
}

.table-simple-bordered .table-simple-bordered {
    background-color: #fff; /* 嵌套表格的背景色 */
}

/* 加载动画 */
#loading {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}