/* ==============================================
 * footer.css - 页脚
 * ============================================== */

.site-footer {
    background: linear-gradient(180deg, #2b2774 0%, #1e1b4b 100%);
    color: rgba(255, 255, 255, 0.85);
}

.site-footer__grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(3, 1fr);
    gap: var(--space-10);
    padding-bottom: var(--space-12);
}

.footer-col h4 {
    color: #fff;
    font-size: var(--fs-md);
    margin-bottom: var(--space-4);
    letter-spacing: 2px;
    position: relative;
    padding-left: 14px;
}
.footer-col h4::before {
    content: "";
    position: absolute;
    left: 0;
    top: 7px;
    bottom: 7px;
    width: 4px;
    background: linear-gradient(180deg, var(--color-primary-light), var(--color-primary));
    border-radius: 2px;
}

.footer-col p,
.footer-col li {
    font-size: var(--fs-sm);
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.7);
}

.footer-col li + li { margin-top: var(--space-2); }

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--duration-fast);
}
.footer-col a:hover {
    color: #fff;
}

.footer-brand__name {
    font-size: var(--fs-2xl);
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-2);
    letter-spacing: 4px;
}
.footer-brand__slogan {
    font-size: var(--fs-sm);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
    margin-bottom: var(--space-4);
}
.footer-brand__contact {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--fs-md);
    color: var(--color-primary-light);
    font-weight: 600;
}
.footer-brand__contact::before {
    content: "📞";
}

/* —— 二维码（页脚）—— */
.footer-qr {
    width: 110px;
    max-width: 100%;
}
.footer-qr img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    background: #fff;
    padding: 6px;
    box-sizing: border-box;
}

.site-footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--space-6) 0;
    text-align: center;
    font-size: var(--fs-xs);
    color: rgba(255, 255, 255, 0.45);
}

/* —— 备案信息栏（工信部合规要求：备案号须置于页面底部并可跳转备案系统）—— */
.site-footer__bottom-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.site-footer__copyright {
    line-height: 1.9;
    margin: 0;
}

.site-footer__beian {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin: 0;
    font-size: 13px;
    line-height: 1.9;
}

.beian-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.62);
    text-decoration: none;
    transition: color var(--duration-fast);
}
.beian-link:hover,
.beian-link:focus-visible {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.beian-icon {
    width: 14px;
    height: 14px;
    flex: none;
    opacity: 0.85;
}

.beian-sep {
    color: rgba(255, 255, 255, 0.22);
    user-select: none;
}

@media (max-width: 900px) {
    .site-footer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-brand { grid-column: span 2; }
}
@media (max-width: 540px) {
    .site-footer__grid {
        grid-template-columns: 1fr;
    }
    .footer-brand { grid-column: span 1; }
}