/* footer.css - 页脚与辅助样式 */
.site-footer {
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.site-footer p {
    margin: 0 0 8px 0;
    color: #aaa;
    font-size: 13px;
}

.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    opacity: 0;
    transition: opacity 0.3s;
}

.back-to-top.visible {
    opacity: 1;
}