/* ============ 页脚 ============ */
.footer {
    background: #2c3e50;
    color: #ecf0f1;
    text-align: center;
    padding: 25px 0;
    margin-top: 50px;
    font-size: 14px;
    line-height: 1.6;
}
.footer a {
    color: #3498db;
    margin: 0 6px;
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline;
}