/* 统一底部样式 */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #1a1a2e 100%);
    color: white;
    padding: 70px 0 40px;
    position: relative;
}

.footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, #0066cc, #00a896);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-column h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #ffffff;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #e0e0e0ee;
    text-decoration: none;
    font-size: 14px;
    line-height: 1.5;
    display: block;
    padding: 5px 0;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: #ffffff;
    text-decoration: underline;
}

.footer-links a i {
    display: none;
}

.footer-column.contact-info p {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
    line-height: 1.7;
    font-size: 14px;
    color: #e0e0e0ee;
}

.footer-column.contact-info p i {
    margin-right: 12px;
    margin-top: 3px;
    color: #00a896;
    font-size: 16px;
    width: 18px;
    flex-shrink: 0;
}

.social-links {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 24px;
    color: #00a896;
}

.social-links a:hover {
    background: linear-gradient(135deg, #0066cc, #00a896);
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    color: #ffffff;
}

.copyright {
    text-align: center;
    padding-top: 35px;
    border-top: 1px solid rgba(255,255,255,0.15);
    font-size: 14px;
    color: #cccccc;
    max-width: 1400px;
    margin: 0 auto;
    padding-left: 30px;
    padding-right: 30px;
    line-height: 1.8;
}

.copyright p {
    margin: 8px 0;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0066cc, #00a896);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .footer {
        padding: 50px 0 30px;
    }
    
    .footer-content {
        gap: 30px;
        padding: 0 20px;
    }
    
    .footer-column h3 {
        font-size: 16px;
    }
    
    .footer-links a {
        font-size: 13px;
    }
    
    .footer-column.contact-info p {
        font-size: 13px;
    }
    
    .copyright {
        font-size: 12px;
        padding-left: 20px;
        padding-right: 20px;
    }
}