/* 页脚样式 */
.footer {
    background-color: #f8f9fa;
    border-top: 1px solid #e9ecef;
    margin-top: 40px;
    animation: fadeIn 0.5s ease;
}

/* 主页脚区域 */
.footer-main {
    background-color: #2c3e50;
    color: #ffffff;
    padding: 40px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.footer-column {
    padding: 0 15px;
}

.footer-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ffffff;
}

.footer-description {
    font-size: 14px;
    line-height: 1.6;
    color: #bdc3c7;
    margin-bottom: 20px;
}

.footer-subtitle {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 15px;
    color: #ffffff;
    position: relative;
    padding-bottom: 8px;
}

.footer-subtitle::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: #3498db;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-link {
    color: #bdc3c7;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
    display: inline-block;
}

.footer-link:hover {
    color: #3498db;
    transform: translateX(5px);
}

.footer-contact-info {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 14px;
    line-height: 1.6;
    color: #bdc3c7;
}

.footer-contact-info li {
    margin-bottom: 10px;
}

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

.footer-legal li {
    margin-bottom: 10px;
}

/* 页脚底部 */
.footer-bottom {
    background-color: #1a252f;
    color: #95a5a6;
    padding: 20px 0;
    border-top: 1px solid #34495e;
}

.footer-bottom-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-version {
    font-size: 14px;
}

.footer-beian {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-size: 13px;
}

.beian-link,
.icp-link {
    color: #95a5a6;
    text-decoration: none;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.beian-link:hover,
.icp-link:hover {
    color: #3498db;
    text-decoration: none;
}

.beian-icon {
    width: 16px;
    height: 20px;
    vertical-align: middle;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .footer-main {
        padding: 30px 0;
    }
    
    .footer-grid {
        gap: 20px;
    }
    
    .footer-title {
        font-size: 18px;
        margin-bottom: 15px;
    }
    
    .footer-subtitle {
        font-size: 14px;
        margin-bottom: 12px;
    }
    
    .footer-bottom {
        padding: 15px 0;
    }
    
    .footer-beian {
        font-size: 12px;
    }
    
    .beian-icon {
        width: 14px;
        height: 14px;
    }
}

@media (max-width: 480px) {
    .footer {
        margin-top: 30px;
    }
    
    .footer-main {
        padding: 20px 0;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .footer-column {
        padding: 0 10px;
    }
    
    .footer-title {
        font-size: 16px;
        margin-bottom: 12px;
    }
    
    .footer-description {
        font-size: 13px;
    }
    
    .footer-subtitle {
        font-size: 13px;
        margin-bottom: 10px;
    }
    
    .footer-links li,
    .footer-contact-info li,
    .footer-legal li {
        margin-bottom: 8px;
    }
    
    .footer-link {
        font-size: 13px;
    }
    
    .footer-bottom {
        padding: 12px 0;
    }
    
    .footer-bottom-content {
        gap: 10px;
    }
    
    .footer-version {
        font-size: 12px;
    }
    
    .footer-beian {
        font-size: 11px;
        gap: 8px;
    }
    
    .beian-icon {
        width: 10px;
        height: 10px;
    }
}

/* 横屏适配 */
@media (max-height: 480px) and (orientation: landscape) {
    .footer-main {
        padding: 20px 0;
    }
    
    .footer-grid {
        gap: 15px;
    }
    
    .footer-title {
        font-size: 14px;
        margin-bottom: 10px;
    }
    
    .footer-description {
        font-size: 12px;
        margin-bottom: 10px;
    }
    
    .footer-subtitle {
        font-size: 12px;
        margin-bottom: 8px;
    }
    
    .footer-links li,
    .footer-contact-info li,
    .footer-legal li {
        margin-bottom: 6px;
    }
    
    .footer-link {
        font-size: 12px;
    }
    
    .footer-bottom {
        padding: 10px 0;
    }
    
    .footer-version {
        font-size: 11px;
    }
    
    .footer-beian {
        font-size: 10px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 触摸反馈 */
@media (hover: none) and (pointer: coarse) {
    .footer-link,
    .beian-link,
    .icp-link {
        -webkit-tap-highlight-color: rgba(52, 152, 219, 0.2);
    }
    
    .footer-link:active,
    .beian-link:active,
    .icp-link:active {
        transform: scale(0.95);
        transition: transform 0.1s ease;
    }
}

/* 深色模式适配 */
@media (prefers-color-scheme: dark) {
    .footer {
        background-color: #1a1a1a;
        border-top-color: #333;
    }
    
    .footer-main {
        background-color: #121212;
    }
    
    .footer-bottom {
        background-color: #0d0d0d;
        border-top-color: #333;
    }
    
    .footer-description,
    .footer-contact-info li {
        color: #999;
    }
    
    .footer-beian {
        color: #777;
    }
    
    .beian-link,
    .icp-link {
        color: #777;
    }
    
    .beian-link:hover,
    .icp-link:hover {
        color: #3498db;
    }
}