/* ========== 页脚 ========== */
.site-footer {
    margin-top: 60px;
    background: #0a0a0a;
}
.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
}

/* 统计数字 */
.footer-stats {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 56px;
    padding: 28px 0;
}
.footer-stats .stat-item {
    text-align: left;
}
.footer-stats .stat-num {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: #f59e0b;
    line-height: 1.2;
    font-family: "DIN", "Helvetica Neue", Arial, sans-serif;
}
.footer-stats .stat-text {
    display: block;
    font-size: 12px;
    color: #aaa;
    margin-top: 6px;
}

/* 分隔线 */
.footer-line {
    height: 1px;
    background: #1a1a1a;
}

/* 导航 */
.footer-nav {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 56px;
    padding: 32px 0;
    align-items: start;
}
.footer-col h4 {
    font-size: 13px;
    font-weight: 600;
    color: #ccc;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-col li {
    margin-bottom: 8px;
}
.footer-col a {
    font-size: 13px;
    color: #bbb;
    text-decoration: none;
    transition: color 0.2s;
}
.footer-col a:hover {
    color: #f59e0b;
}
.footer-col li:not(:has(a)) {
    font-size: 13px;
    color: #bbb;
}

/* 二维码 */
.footer-qr-col {
    text-align: center;
}
.footer-qr {
    margin-bottom: 6px;
}
.footer-qr img {
    width: 100px;
    height: 100px;
    border-radius: 6px;
    object-fit: contain;
    border: 1px solid #222;
    padding: 4px;
    background: #111;
}
.footer-qr-col span {
    font-size: 12px;
    color: #999;
}

/* 底部 */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding: 20px 0 28px;
}
.footer-copy {
    font-size: 12px;
    color: #999;
    display: flex;
    align-items: center;
}
.footer-copy .sep {
    margin: 0 10px;
    color: #666;
}
.footer-fl {
    display: flex;
    align-items: center;
    gap: 26px;
    flex-wrap: wrap;
    font-size: 17px;
    color: #999;
}
.footer-fl a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.2s;
}
.footer-fl a:hover {
    color: #f59e0b;
}

/* 返回顶部 */
.back-top {
    position: fixed;
    bottom: 28px;
    right: 20px;
    width: 40px;
    height: 40px;
    background: #111;
    border: 1px solid #222;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #555;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s ease;
    z-index: 999;
}
.back-top:hover {
    background: #f59e0b;
    border-color: #f59e0b;
    color: #000;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .footer-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-stats .stat-num {
        font-size: 24px;
    }
    .footer-nav {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .footer-fl {
        justify-content: center;
    }
}