/* 
 * 响应式CSS框架 - 学校招标信息监控管理系统
 * 支持PC端和H5移动端
 */

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 响应式容器 */
.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .container {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}

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

.col {
    flex: 1 0 0%;
    padding: 0 15px;
}

/* 响应式列 */
.col-12 { flex: 0 0 100%; max-width: 100%; }
.col-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
.col-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-7 { flex: 0 0 58.333333%; max-width: 58.333333%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-5 { flex: 0 0 41.666667%; max-width: 41.666667%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }

/* 响应式显示/隐藏 */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }

@media (max-width: 767.98px) {
    .d-sm-none { display: none !important; }
    .d-sm-block { display: block !important; }
    .d-sm-flex { display: flex !important; }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .d-md-none { display: none !important; }
    .d-md-block { display: block !important; }
    .d-md-flex { display: flex !important; }
}

@media (min-width: 992px) {
    .d-lg-none { display: none !important; }
    .d-lg-block { display: block !important; }
    .d-lg-flex { display: flex !important; }
}

/* 间距工具 */
.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mb-5 { margin-bottom: 3rem !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: 0.25rem !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.p-4 { padding: 1.5rem !important; }
.p-5 { padding: 3rem !important; }

/* 文本工具 */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }
.text-justify { text-align: justify !important; }

.text-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 响应式字体大小 */
.fs-1 { font-size: 3rem; }
.fs-2 { font-size: 2.5rem; }
.fs-3 { font-size: 2rem; }
.fs-4 { font-size: 1.5rem; }
.fs-5 { font-size: 1.25rem; }
.fs-6 { font-size: 1rem; }

@media (max-width: 767.98px) {
    .fs-1 { font-size: 2.5rem; }
    .fs-2 { font-size: 2rem; }
    .fs-3 { font-size: 1.75rem; }
    .fs-4 { font-size: 1.25rem; }
    .fs-5 { font-size: 1.125rem; }
}

/* 卡片组件 */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    background-color: #f8f9fa;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    border-top: 1px solid #eee;
    background-color: #f8f9fa;
}

/* 按钮组件 */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
}

.btn:focus {
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.btn-primary {
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: #667eea;
}

.btn-primary:hover {
    opacity: 0.9;
}

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

.btn-success {
    color: white;
    background-color: #28a745;
    border-color: #28a745;
}

.btn-danger {
    color: white;
    background-color: #dc3545;
    border-color: #dc3545;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    border-radius: 0.2rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
    border-radius: 0.3rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* 表单组件 */
.form-group {
    margin-bottom: 1rem;
}

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

.form-control {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: white;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: #495057;
    background-color: white;
    border-color: #667eea;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-control-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    border-radius: 0.2rem;
}

.form-control-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
    border-radius: 0.3rem;
}

/* 表格组件 */
.table {
    width: 100%;
    margin-bottom: 1rem;
    color: #212529;
    background-color: transparent;
    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;
    background-color: #f8f9fa;
    font-weight: 600;
}

.table tbody + tbody {
    border-top: 2px solid #dee2e6;
}

.table-responsive {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* 导航栏 */
.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    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;
}

.navbar-nav .nav-link {
    padding-right: 0;
    padding-left: 0;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
}

.navbar-nav .nav-link:hover {
    color: white;
}

/* 移动端汉堡菜单 */
.navbar-toggler {
    padding: 0.25rem 0.75rem;
    font-size: 1.25rem;
    line-height: 1;
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.25rem;
    color: white;
    cursor: pointer;
    display: none;
}

.navbar-toggler-icon {
    display: inline-block;
    width: 1.5em;
    height: 1.5em;
    vertical-align: middle;
    content: "";
    background: no-repeat center center;
    background-size: 100% 100%;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 移动端优化 */
@media (max-width: 767.98px) {
    .navbar-toggler {
        display: block;
    }
    
    .navbar-collapse {
        display: none;
        width: 100%;
    }
    
    .navbar-collapse.show {
        display: block;
    }
    
    .navbar-nav {
        flex-direction: column;
        margin-top: 1rem;
    }
    
    .navbar-nav .nav-item {
        margin-bottom: 0.5rem;
    }
    
    /* 移动端表格优化 */
    .table-responsive {
        border: 0;
    }
    
    .table thead {
        display: none;
    }
    
    .table, .table tbody, .table tr, .table td {
        display: block;
        width: 100%;
    }
    
    .table tr {
        margin-bottom: 1rem;
        border: 1px solid #dee2e6;
        border-radius: 0.25rem;
    }
    
    .table td {
        text-align: right;
        padding-left: 50%;
        position: relative;
        border-top: 1px solid #dee2e6;
    }
    
    .table td::before {
        content: attr(data-label);
        position: absolute;
        left: 0.75rem;
        width: calc(50% - 1.5rem);
        padding-right: 1rem;
        text-align: left;
        font-weight: 600;
        color: #495057;
    }
    
    /* 移动端卡片优化 */
    .card {
        margin-bottom: 1rem;
    }
    
    .card-header,
    .card-body,
    .card-footer {
        padding: 1rem;
    }
    
    /* 移动端按钮优化 */
    .btn {
        padding: 0.75rem 1rem;
        font-size: 1rem;
    }
    
    .btn-block {
        margin-bottom: 0.5rem;
    }
    
    /* 移动端表单优化 */
    .form-control {
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    input[type="text"],
    input[type="password"],
    input[type="email"],
    input[type="url"],
    input[type="tel"],
    input[type="number"],
    textarea {
        font-size: 16px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        opacity: 1;
    }
    
    .card:hover {
        transform: none;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }
    
    /* 增加触摸目标大小 */
    .btn,
    .nav-link,
    .form-check-label,
    .table td[onclick] {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* 防止双击缩放 */
    button,
    input,
    select,
    textarea {
        touch-action: manipulation;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #121212;
        color: #e0e0e0;
    }
    
    .card {
        background-color: #1e1e1e;
        border-color: #333;
    }
    
    .card-header,
    .card-footer {
        background-color: #252525;
        border-color: #333;
    }
    
    .form-control {
        background-color: #2d2d2d;
        border-color: #444;
        color: #e0e0e0;
    }
    
    .form-control:focus {
        background-color: #2d2d2d;
        border-color: #667eea;
        color: #e0e0e0;
    }
    
    .table {
        color: #e0e0e0;
    }
    
    .table th,
    .table td {
        border-color: #444;
    }
    
    .table thead th {