/* 
 * 响应式CSS文件
 * 学校招标信息监控管理系统
 */

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

/* 响应式容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 响应式网格系统 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

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

/* 响应式断点 */
@media (max-width: 576px) {
    .container {
        padding: 0 10px;
    }
    
    .col {
        flex: 0 0 100%;
        margin-bottom: 15px;
    }
}

@media (min-width: 577px) and (max-width: 768px) {
    .col {
        flex: 0 0 50%;
    }
}

@media (min-width: 769px) and (max-width: 992px) {
    .col {
        flex: 0 0 33.333%;
    }
}

@media (min-width: 993px) and (max-width: 1200px) {
    .col {
        flex: 0 0 25%;
    }
}

@media (min-width: 1201px) {
    .col {
        flex: 0 0 20%;
    }
}

/* 响应式表格 */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* 响应式图片 */
img {
    max-width: 100%;
    height: auto;
}

/* 响应式导航 */
.navbar-toggler {
    display: none;
}

@media (max-width: 768px) {
    .navbar-toggler {
        display: block;
    }
    
    .navbar-collapse {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        display: none;
    }
    
    .navbar-collapse.show {
        display: block;
    }
}

/* 响应式表单 */
.form-group {
    margin-bottom: 15px;
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

@media (max-width: 576px) {
    .form-control {
        font-size: 16px; /* 防止iOS缩放 */
    }
}

/* 响应式按钮 */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
}

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

@media (max-width: 576px) {
    .btn {
        padding: 10px 20px;
        font-size: 16px;
    }
}

/* 响应式卡片 */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    overflow: hidden;
}

.card-body {
    padding: 20px;
}

@media (max-width: 576px) {
    .card-body {
        padding: 15px;
    }
}

/* 响应式工具类 */
.hidden-xs {
    display: none;
}

.visible-xs {
    display: block;
}

@media (min-width: 577px) {
    .hidden-xs {
        display: block;
    }
    
    .visible-xs {
        display: none;
    }
}

/* 打印样式 */
@media print {
    .no-print {
        display: none !important;
    }
    
    .container {
        width: 100%;
        max-width: none;
    }
}