/* 页脚 */
footer {
    background: linear-gradient(135deg, var(--dark-purple), var(--primary-purple));
    padding: 4rem 5% 3rem;
    text-align: center;
    color: white;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--accent-purple), var(--primary-purple));
}

footer p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.9;
}

.footer-links a:hover {
    opacity: 1;
    transform: translateY(-2px);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.footer-links a::before {
    content: "•";
    color: var(--accent-purple);
    font-size: 1.5rem;
    line-height: 0;
}

/* ===== 页脚新增：社交图标 + 商标声明 ===== */
.social-icons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 1rem 0;
}

.social-link {
    color: #fff;
    font-size: 1.8rem;
    transition: transform .3s, color .3s;
}
.social-link:hover {
    transform: translateY(-3px);
    color: var(--accent-purple);
}

.trademark {
    font-size: .85rem;
    color: rgba(255,255,255,.7);
    margin: 1rem 0 0;
    line-height: 1.5;
}

/* 响应式页脚：小屏居中 */
@media (max-width: 768px) {
    .social-icons { gap: 1rem; }
    .social-link { font-size: 1.5rem; }
    .footer-links {
        flex-direction: column;
        gap: 1.5rem;
    }
}