/* 底部导航样式 */
.footer {
    background-color: #2c3e50;
    color: #fff;
    margin-top: 50px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 30px auto 0;
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.social-icon {
    color: #bdc3c7;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.social-icon:hover {
    color: #fff;
}

.copyright {
    color: #bdc3c7;
    font-size: 14px;
}

.copyright a {
    color: #bdc3c7;
    text-decoration: none;
}

.copyright a:hover {
    color: #fff;
}

/* 弹窗公共样式 */
.modal-mask {
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 99998;
}

.modal-dialog {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 99999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
    }
    
    .modal-dialog {
        width: 90% !important;
        max-width: 420px;
    }
}