/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa;
    padding: 20px;
    line-height: 1.5;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 50px auto;
    background-color: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

/* 文本对齐 */
.text-center {
    text-align: center;
}

.text-danger {
    color: #dc3545;
}

/* 标题 */
h2, h3, h4 {
    margin-bottom: 1rem;
}

/* 表格 */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.table thead {
    background-color: #f8f9fa;
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0,0,0,.02);
}

.table-hover tbody tr:hover {
    background-color: rgba(0,0,0,.04);
}

/* 表单 */
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control,
.form-select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out;
}

.form-control:focus,
.form-select:focus {
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13,110,253,.25);
}

.mb-3 {
    margin-bottom: 1rem;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.mt-3 {
    margin-top: 1rem;
}

.me-3 {
    margin-right: 1rem;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 0.25rem;
    cursor: pointer;
    transition: all 0.15s ease-in-out;
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.btn-primary {
    color: #fff;
    background-color: #0d6efd;
    border-color: #0d6efd;
}

.btn-primary:hover:not(:disabled) {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.btn-secondary {
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #5c636a;
    border-color: #565e64;
}

.btn-success {
    color: #fff;
    background-color: #198754;
    border-color: #198754;
}

.btn-success:hover:not(:disabled) {
    background-color: #157347;
    border-color: #146c43;
}

.btn-info {
    color: #000;
    background-color: #0dcaf0;
    border-color: #0dcaf0;
}

.btn-info:hover:not(:disabled) {
    background-color: #31d2f2;
    border-color: #25cff2;
}

/* 网格系统 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -15px;
    margin-left: -15px;
}

.col-md-6 {
    flex: 0 0 50%;
    max-width: 50%;
    padding-right: 15px;
    padding-left: 15px;
}

.justify-content-center {
    justify-content: center;
}

.align-items-center {
    align-items: center;
}

.d-flex {
    display: flex;
}

.d-grid {
    display: grid;
}

.gap-2 {
    gap: 0.5rem;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1050;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: rgba(0,0,0,0.5);
}

.modal.show {
    display: block;
}

.modal-dialog {
    position: relative;
    width: auto;
    max-width: 500px;
    margin: 1.75rem auto;
}

.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    background-color: #fff;
    border-radius: 0.3rem;
    box-shadow: 0 0.5rem 1rem rgba(0,0,0,0.15);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid #dee2e6;
    border-radius: 0.3rem 0.3rem 0 0;
}

.modal-header.bg-success {
    background-color: #198754;
}

.modal-header.bg-success .modal-title {
    color: #fff;
}

.modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 500;
}

.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: 1rem;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 1rem;
    border-top: 1px solid #dee2e6;
    gap: 0.5rem;
}

.btn-close {
    background: transparent;
    border: 0;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    color: #000;
    opacity: 0.5;
    cursor: pointer;
}

.btn-close:hover {
    opacity: 0.75;
}

.btn-close-white {
    filter: invert(1);
}

/* 结果框 */
.result-box {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    display: none;
    background-color: rgba(255, 255, 255, 0.9);
}

/* 响应式 */
@media (max-width: 768px) {
    .col-md-6 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px;
        margin-top: 20px;
    }
}