footer {
    background: #070516;
    padding: 50px 20px 20px;
    text-align: center;
    position: relative;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 40px;
}

.footer-column {
    flex: 1;
    min-width: 200px;
    text-align: left;
    padding: 0 15px;
    max-width: 23%;
}

.footer-column h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--secondary);
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--accent);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.footer-links i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
    color: var(--accent);
}

.footer-links a {
    color: var(--gray);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent);
    transform: translateX(5px);
}

.social-icons {
    display: flex;
    justify-content: flex-start;
    gap: 15px;
    margin-top: 20px;
    position: relative;
}

.social-icon-container {
    position: relative;
    display: inline-block;
}

.social-icons a {
    display: inline-block;
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.social-icons a:hover {
    background: var(--accent);
    transform: translateY(-5px);
}

.copyright {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray);
    font-size: 0.9rem;
}

/* 备案号（工信部要求底部展示并链接 beian.miit.gov.cn） */
.icp-record {
    margin-top: 6px;
}

.icp-record a {
    color: var(--gray);
    text-decoration: none;
    transition: color 0.3s ease;
}

.icp-record a:hover {
    color: var(--accent);
}