/* 页脚样式 - 可自定义 */
.footer {
    background-color: var(--secondary-color);
    padding: 30px 0;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    text-align: center;
}

.copyright {
    font-size: 14px;
    color: var(--light-text-color);
}

.copyright p {
    margin-bottom: 8px;
}

.copyright a {
    color: var(--light-text-color);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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