/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 20px;
    padding: 15px;
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.title {
    font-size: 1.8em;
    color: #333;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 1em;
    color: #666;
}

/* 分类卡片样式 */
.section-card {
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    overflow: hidden;
}

.section-header {
    padding: 12px 15px;
    background-color: #f0f0f0;
    color: #333;
    border-bottom: 1px solid #ddd;
}

.section-title {
    font-size: 1.3em;
    margin-bottom: 0;
    font-weight: 500;
}

.section-subtitle {
    font-size: 0.9em;
    color: #666;
}

/* 按钮网格样式 - 简洁设计 */
.button-grid {
    display: flex;
    flex-wrap: wrap;
    padding: 10px;
    gap: 8px;
}

/* 简洁下载按钮 */
.download-btn {
    display: inline-block;
    padding: 8px 12px;
    text-decoration: none;
    text-align: center;
    border-radius: 3px;
    font-weight: normal;
    font-size: 0.9em;
    position: relative;
    transition: background-color 0.2s ease;
    color: #333;
    background-color: #f5f5f5;
    border: 1px solid #ddd;
}

/* 交替颜色样式 - 更加商务化 */
.download-btn:nth-child(odd) {
    background-color: #f5f5f5;
}

.download-btn:nth-child(even) {
    background-color: #e9e9e9;
}

/* 悬停效果 - 简单 */
.download-btn:hover {
    background-color: #e0e0e0;
}

/* 文件图标 - 简洁 */
.download-btn::before {
    content: "•";
    margin-right: 5px;
    color: #666;
}

/* 页脚样式 */
.footer {
    text-align: center;
    padding: 15px;
    margin-top: 20px;
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.footer-text {
    color: #666;
    font-size: 0.9em;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .button-grid {
        gap: 5px;
    }
    
    .download-btn {
        padding: 6px 10px;
        font-size: 0.85em;
    }
}