/* 页脚优化 */
footer {
    background-color: var(--bg-secondary);
    padding: 40px 0;
    text-align: center;
    border-top: 2px solid var(--primary-light);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-dark), var(--primary-medium), var(--primary-dark), transparent);
    animation: gradientShift 3s ease infinite;
}

footer p {
    color: var(--text-secondary);
    font-size: 16px;
    letter-spacing: 0;
}