/* ============================================
   Footer Styles
   简洁页脚样式
   ============================================ */

.footer {
    background: #fff;
    color: #64748b;
}

/* Footer Copyright */
.footer-copyright {
    padding: 8px 0;
    background: #f8fafc;
    border-top: 1px solid #e2e8f0;
}

.footer-copyright-content {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.copyright-text {
    margin: 0;
    font-size: 13px;
    color: #94a3b8;
    letter-spacing: 0.3px;
}

/* Social Icons - 右侧 */
.footer-social {
    display: flex;
    gap: 8px;
    align-items: center;
    position: absolute;
    right: 0;
}

.social-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #1e293b;
    border: none;
    border-radius: 5px;
    color: #fff;
    transition: all 0.3s ease;
}

.social-icon svg {
    width: 14px;
    height: 14px;
}

/* Back to Top */
.back-top {
    position: fixed;
    right: 35px;
    bottom: 35px;
    width: 40px;
    height: 40px;
    background: #1e293b;
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(30, 41, 59, 0.3);
}

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

.back-top:hover {
    background: #334155;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(30, 41, 59, 0.4);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    .footer-copyright {
        padding: 8px 0;
    }
    
    .footer-copyright-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .copyright-text {
        order: 2;
    }
    
    .footer-social {
        order: 1;
    }
    
    .back-top {
        right: 20px;
        bottom: 20px;
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .footer-copyright {
        padding: 6px 0;
    }
    
    .social-icon {
        width: 26px;
        height: 26px;
    }
}