.bd-footer {
    background-color: #f8f9fa;
    padding: 1.5rem 0;
    color: #212529;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

@media (min-width: 768px) {
    .bd-footer {
        padding: 3rem 0;
    }
}

.bd-footer .container {
    padding: 1.5rem 1rem;
}

@media (min-width: 768px) {
    .bd-footer .container {
        padding: 3rem 1rem;
    }
}

/* 链接基础样式 */
.bd-footer a {
    color: #495057;
    text-decoration: none;
    position: relative;
}

.bd-footer a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: #000000;
    transition: all 0.3s ease;
}

.bd-footer a:hover::after,
.bd-footer a:focus::after {
    width: 100%;
}

.bd-footer a:hover,
.bd-footer a:focus {
    color: #000000;
}

/* Logo 区域样式 */
.bd-footer .logo-link {
    display: inline-flex;
    align-items: center;
    transition: transform 0.2s ease;
}

.bd-footer .logo-link:hover {
    transform: scale(1.05);
}

.bd-footer .logo-link::after {
    display: none;
}

.bd-footer .text-body-emphasis {
    color: #212529 !important;
}

.bd-footer .fs-5 {
    font-size: 1.125rem !important;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.bd-footer .list-unstyled {
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 0;
}

.bd-footer .list-unstyled li {
    margin-bottom: 0.5rem;
}

/* 导航链接样式 */
.bd-footer-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: #212529;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    position: relative;
    display: inline-block;
}

.bd-footer-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
    font-size: 0.875rem;
}

.bd-footer-list li {
    margin-bottom: 0.5rem;
    transition: transform 0.2s ease;
}

.bd-footer-list li:hover {
    transform: translateX(5px);
}

.bd-footer-list li:last-child {
    margin-bottom: 0;
}

/* 响应式布局 */
@media (min-width: 576px) {
    .bd-footer .container {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .bd-footer .container {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .bd-footer .container {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .bd-footer .container {
        max-width: 1140px;
    }
}

/* 移动端优化 */
@media (max-width: 767.98px) {
    .bd-footer-title {
        margin-top: 1.5rem;
        margin-bottom: 0.75rem;
    }

    .bd-footer [class*="col-"]:first-child .bd-footer-title {
        margin-top: 0;
    }
}