/* body {
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    margin: 0;
    padding: 20px;
    overflow-x: auto;
} */

/* 只有knowledge.html使用的导航栏 */
nav{
    height: 5rem;
    /* border: 1px solid red; */
    color: white;
}

/* 正文 */
.container {
    max-width: 800px;
    margin: 6rem auto;
    padding: 0 1rem;
    overflow: auto;
}

.era {
    margin-bottom: 50px;
}

.era-title {
    font-size: 24px;
    color: #333;
    margin-bottom: 20px;
    position: sticky;
    left: 20px;
}

.conlist {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    /* margin: 80px 10% 60px 80px; */
}

.tech-node {
    background: #fff;
    border: 2px solid #4CAF50;
    border-radius: 8px;
    padding: 15px;
    width: 200px;
    cursor: pointer;
    transition: transform 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: block; /* a标签默认inline需要改为block */
    text-decoration: none; /* 去除下划线 */
    color: inherit; /* 继承父级颜色 */
}

.tech-node:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.node-title {
    font-weight: bold;
    color: #2c662d;
    margin-bottom: 10px;
}

.node-desc {
    font-size: 0.9em;
    color: #666;
}

.connection {
    position: absolute;
    height: 2px;
    background: #888;
    transform-origin: left;
}

.tooltip {
    position: fixed;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 10px;
    border-radius: 5px;
    pointer-events: none;
    max-width: 300px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* .container{
        padding: 0 0.5rem;
    } */
    .conlist {
        grid-template-columns: 1fr 1fr;
        /* margin: 80px 35% 60px 50px; */
    }
}