/* 简化版Bootstrap核心样式 */
.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -15px;
    margin-left: -15px;
}

.col-1, .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-10, .col-11, .col-12, .col-sm-1, .col-sm-2, .col-sm-3, .col-sm-4, .col-sm-5, .col-sm-6, .col-sm-7, .col-sm-8, .col-sm-9, .col-sm-10, .col-sm-11, .col-sm-12, .col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12, .col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6, .col-lg-7, .col-lg-8, .col-lg-9, .col-lg-10, .col-lg-11, .col-lg-12 {
    position: relative;
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
}

.col-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-4 {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
}

.col-3 {
    flex: 0 0 25%;
    max-width: 25%;
}

@media (min-width: 576px) {
    .col-sm-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }
    .col-sm-4 {
        flex: 0 0 33.333333%;
        max-width: 33.333333%;
    }
}

@media (min-width: 768px) {
    .col-md-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }
    .col-md-4 {
        flex: 0 0 33.333333%;
        max-width: 33.333333%;
    }
    .col-md-3 {
        flex: 0 0 25%;
        max-width: 25%;
    }
}

/* 导航栏样式 */
.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background-color: #2c3e50;
    color: white;
}

.navbar-brand {
    display: inline-block;
    padding-top: 0.3125rem;
    padding-bottom: 0.3125rem;
    margin-right: 1rem;
    font-size: 1.25rem;
    line-height: inherit;
    white-space: nowrap;
    color: white;
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

.nav-link:hover, .nav-link:focus {
    color: white;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: 0.25rem;
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

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

.btn-primary:hover {
    color: #fff;
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

/* 卡片样式 */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: 0.25rem;
}

.card-body {
    flex: 1 1 auto;
    padding: 1rem;
}

.card-header {
    padding: 0.5rem 1rem;
    margin-bottom: 0;
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

/* 表单样式 */
.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: #212529;
    background-color: #fff;
    border-color: #86b7fe;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* 表格样式 */
.table {
    width: 100%;
    margin-bottom: 1rem;
    color: #212529;
    border-collapse: collapse;
}

.table th, .table td {
    padding: 0.75rem;
    vertical-align: top;
    border-top: 1px solid #dee2e6;
}

.table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid #dee2e6;
}

/* 响应式工具 */
.d-flex {
    display: flex !important;
}

.justify-content-between {
    justify-content: space-between !important;
}

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

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

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

.p-3 {
    padding: 1rem !important;
}

.text-center {
    text-align: center !important;
}

.text-primary {
    color: #0d6efd !important;
}

.text-success {
    color: #198754 !important;
}

.text-danger {
    color: #dc3545 !important;
}

.text-warning {
    color: #ffc107 !important;
}