/* 新增全局布局设置 */
html {
    height: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0; /* 移除默认外边距 */
    width: 70%;
    background-color: #f0f0f0;
}

main {
    flex: 1; /* 占据剩余空间 */
    padding-bottom: 60px; /* 留出页脚高度+安全间距 */
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
    width: 100%;
    box-shadow: 0 -2px 4px rgba(0,0,0,0.1);
    margin-top: auto;
}
.content {
    flex: 1; /* 关键：占据剩余空间 */
    position: relative; /* 修正原来的display:relative错误 */
    margin-top: 60px;
    padding-bottom: 20px; /* 可选：底部留白 */
}

footer, footer > * {
    margin-left: 0;
    margin-right: 0;
    padding-left: 15px;
    padding-right: 15px;
    box-sizing: border-box;
}

footer a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: white;
    text-decoration: underline;
}

footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

footer li {
    display: inline-block;
    margin: 0;
}