/* ============================================
   1. 全局重置与基础样式
   ============================================ */
/* 清除常用元素的默认边距和内边距，确保布局一致性[2](@ref) */
body, h1, h2, h3, h4, h5, h6, p, ul, li, hr {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}


/* ============================================
   2. 主容器与网格布局 (采用CSS Grid)
   ============================================ */
/* 使用CSS Grid实现响应式两列布局，这是现代布局的首选方案[6](@ref)[8](@ref) */
.grid-big .grid {
    /*display: grid;*/
    /* 移动优先：默认单列布局[6](@ref) */
    grid-template-columns: 1fr;
    gap: 30px;
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 15px;
}

/* 中等屏幕（平板）及以上，切换为两列布局（9:3比例） */
@media (min-width: 768px) {
    .grid-big .grid {
        grid-template-columns: 3fr 1fr;
    }
}

/* ============================================
   3. 面包屑导航优化
   ============================================ */
.grid-big .nav-breadcrumb {
    font-size: 0.9em;
    padding: 12px 15px;
    background-color: #f8f9fa;
    border-radius: 6px;
    margin-bottom: 25px;
    border: 1px solid #e9ecef;
}

.grid-breadcrumb li {
    display: inline;
}

.grid-big .nav-breadcrumb li:not(:last-child)::after {
    content: "›";
    margin: 0 10px;
    color: #6c757d;
}

.grid-big .nav-breadcrumb a {
    color: #495057;
}

.grid-big .nav-breadcrumb a:hover {
    color: #007bff;
    text-decoration: underline;
}

/* ============================================
   4. 分页导航优化
   ============================================ */
.grid-big .nav-page {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 25px 0;
    margin-top: 30px;
    border-top: 1px solid #dee2e6;
}

.grid-big .nav-page li {
    margin: 0 4px;
}

.grid-big .nav-page a {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    color: #007bff;
    font-size: 0.95em;
    min-width: 40px;
    text-align: center;
}

.grid-big .nav-page li.active a {
    background-color: #007bff;
    color: #fff;
    border-color: #007bff;
    font-weight: bold;
}

.grid-big .nav-page a:hover:not(.active) {
    background-color: #e9ecef;
    border-color: #adb5bd;
}

/* ============================================
   5. 侧边栏卡片样式优化 (核心改进)
   ============================================ */
/* 侧边栏容器 */
.grid-big .bg.radius {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    border: 1px solid #e9ecef;
}

.grid-big .bg.radius .padding {
    padding: 20px;
}

/* 侧边栏标题 */
.grid-big .bg.radius h5 {
    font-size: 1.25rem;
    color: #212529;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #007bff;
}

.grid-big .bg.radius hr {
    border: none;
    height: 1px;
    background-color: #e9ecef;
    margin: 15px 0 25px;
}

/* 实训项目卡片 - 采用现代卡片设计[9](@ref)[10](@ref)[11](@ref) */
.grid-big .card {
    display: block; /* 使<a>标签表现为块级元素 */
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 8px;
    color: #fff;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: none;
    position: relative;
    overflow: hidden;
}

/* 卡片悬停效果，增强交互感[11](@ref) */
.grid-big .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* 定义不同卡片的背景色 */
.grid-big .card.bg-success {
    background: linear-gradient(135deg, #28a745, #20c997);
}
.grid-big .card.bg-sub {
    background: linear-gradient(135deg, #6c757d, #868e96);
}
.grid-big .card.bg-main {
    background: linear-gradient(135deg, #007bff, #0056b3);
}

/* 卡片内部标题和段落 */
.grid-big .card h4 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    font-weight: 600;
}
.grid-big .card p {
    font-size: 0.9em;
    opacity: 0.9;
    margin-bottom: 0;
}

/* ============================================
   6. “地方伙伴”列表优化
   ============================================ */
.grid-big .bg.radius .hidden div {
    font-size: 0.9em;
    line-height: 1.8;
}

.grid-big .bg.radius .text-gray {
    font-size: 0.8em;
    color: #6c757d;
    display: block;
    margin-bottom: 12px;
    font-style: italic;
}

.grid-big .bg.radius .hidden div span {
    display: block;
    padding: 6px 0;
    border-bottom: 1px dashed #e9ecef;
}

.grid-big .bg.radius .hidden div span:last-child {
    border-bottom: none;
}

/* ============================================
   7. 响应式设计优化 (移动端适配)
   ============================================ */
@media (max-width: 767px) {
    /* 调整主网格间距和内边距 */
    .grid-big .grid {
        gap: 20px;
        padding: 0 10px;
    }

    /* 调整卡片内边距和字体大小 */
    .grid-big .card {
        padding: 15px;
        margin-bottom: 10px;
    }
    .grid-big .card h4 {
        font-size: 1.1rem;
    }

    /* 分页按钮在小屏幕上适应 */
    .grid-big .nav-page {
        flex-wrap: wrap;
    }
    .grid-big .nav-page a {
        padding: 6px 12px;
        margin-bottom: 5px;
    }

    /* 侧边栏内边距调整 */
    .grid-big .bg.radius .padding {
        padding: 15px;
    }
}

/* ============================================
   8. 实用工具类 (补充)
   ============================================ */
.padding {
    padding: 15px 0;
}
.text-white {
    color: #fff;
}
.size-mini {
    font-size: 0.85em;
}
.text-gray {
    color: #6c757d;
}
.align-center {
    text-align: center;
}
.hidden {
    display: block; /* 根据您的HTML，这里可能是要显示的内容，所以改为block */
}