/* ===== 页脚区域样式 ===== */
.footer {
    /* background-color: #263238; */
    background-color: rgb(34, 34, 34);
    color: #fff;
    padding: 80px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 50px;
}

.footer-column {
    flex: 1;
    margin-right: 50px;
}

.footer-column:last-child {
    margin-right: 0;
}

.footer-column h3 {
    font-size: 22px;
    margin-bottom: 25px;
    color: #fff;
    position: relative;
    padding-bottom: 15px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: #1e88e5;
    border-radius: 1.5px;
}

.footer-column p,
.footer-column ul li {
    color: #ccc;
    margin-bottom: 15px;
    line-height: 1.7;
}

.footer-column ul li i {
    margin-right: 15px;
    color: #1e88e5;
    font-size: 18px;
}

.footer-column ul li a {
    color: #ccc;
    transition: color 0.3s, transform 0.3s;
    display: inline-block;
}

.footer-column ul li a:hover {
    color: #1e88e5;
    transform: translateX(5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    color: #ccc;
}

.footer-bottom p {
    font-size: 14px;
}

/* 页脚二维码样式 */
.footer-qrcode {
    text-align: left;
    margin-top: 15px;
}

.footer-qrcode img {
    width: 120px;
    height: 120px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: block;
    margin: 0;
}

.footer-qrcode img:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.footer-qrcode p {
    font-size: 12px;
    margin-top: 8px;
    color: #ccc;
    line-height: 1.4;
    text-align: left;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #1e88e5;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    opacity: 0;
    pointer-events: none;
    z-index: 999;
    border: none;
    cursor: pointer;
}

.back-to-top:hover {
    background-color: #1565c0;
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.3);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .footer {
        padding: 60px 0 20px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-column {
        margin-right: 0;
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .footer {
        padding: 50px 0 20px;
    }
    
    .footer-column {
        margin-bottom: 30px;
    }
    
    .footer-column h3 {
        font-size: 20px;
        margin-bottom: 20px;
    }
    
    .back-to-top {
        width: 45px;
        height: 45px;
        font-size: 18px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 576px) {
    .footer {
        padding: 40px 0 15px;
    }
    
    .footer-column h3 {
        font-size: 18px;
    }
    
    .footer-column p,
    .footer-column ul li {
        font-size: 14px;
        margin-bottom: 12px;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}

@media (max-width: 320px) {
    .footer-column h3 {
        font-size: 16px;
    }
    
    .footer-column p,
    .footer-column ul li {
        font-size: 13px;
    }
    
    .back-to-top {
        width: 35px;
        height: 35px;
        font-size: 14px;
        bottom: 15px;
        right: 15px;
    }
}