/* -------------------------------------------------------------------
 * Footer
 * 底部样式
------------------------------------------------------------------- */

.footer {
    position: relative;
    width: 100%;
    background: #282a2e;
    color: rgba(255, 255, 255, 0.9);
    font-size: 14px;
    padding: 0;
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px 32px;
    gap: 40px;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    text-align: center;
}

.footer-title {
    font-size: 16px;
    font-weight: 400;
    color: #FFFFFF;
    margin: 0 0 4px 0;
}

.footer a.footer-link,
.footer a.footer-link:visited {
    color: #696969;
    text-decoration: none;
    opacity: 0.9;
    transition: opacity 0.25s ease, color 0.25s ease;
}

.footer a.footer-link:hover {
    opacity: 1;
    color: #FFFFFF;
}

.footer-text {
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
}

.footer-column.footer-brand {
    align-items: center;
    text-align: center;
    margin-left: auto;
}

.footer-logo {
    max-width: 10vw;
    max-height: 10vh;
    width: auto;
    height: auto;
    object-fit: contain;
    margin-bottom: 18px;
}

.footer-icons {
    display: flex;
    gap: 12px;
    align-items: center;
}

.footer-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    position: relative;
}

.footer-icon-tooltip {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(6px);
    padding: 5px 10px;
    font-size: 12px;
    color: #fff;
    background: #282a2e;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    z-index: 10;
}

.footer-icon:hover .footer-icon-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(8px);
}

.footer-icon img {
    display: block;
    width: 30px;
    height: 30px;
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: filter 0.25s ease;
}

.footer-icon:hover img {
    filter: brightness(0) invert(1) brightness(0.41);
}

.footer-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.12);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-bottom {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px 24px;
    font-size: 12px;
    color: #696969;
    text-align: left;
}

.footer-bottom .footer-copyright-line,
.footer-bottom p.footer-copyright-line {
    color: #696969;
}

.footer-copyright-line {
    margin: 0 0 6px 0;
    line-height: 1.5;
}

.footer-copyright-line:last-child {
    margin-bottom: 0;
}

.footer .footer-icp {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: #696969;
    text-decoration: none;
    transition: color 0.25s ease;
}

.footer .footer-icp:hover {
    color: #ffffff;
}

.footer-icp-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* 手机端：隐藏原第四栏；在下方 footer-social-mobile 单独展示社交媒体按钮 */
html.mobile .footer-column.footer-brand {
    display: none !important;
}

html.mobile .footer-social-mobile {
    width: 100%;
    padding: 20px 16px 8px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

html.mobile .footer-social-mobile-title {
    width: 100%;
    box-sizing: border-box;
    color: #fff;
    font-size: 16px;
    font-weight: 400;
    margin: 0 0 16px;
}

/* 社交媒体图标：.card 为 fit-content 块级，在手机上会靠左；用整行 flex 居中 */
html.mobile .footer-social-mobile > div {
    display: flex;
    justify-content: center;
    width: 100%;
}

html.mobile .footer-social-mobile .card {
    margin-left: auto;
    margin-right: auto;
}

html.mobile .footer-top {
    flex-direction: column;
    align-items: stretch;
    padding: 24px 16px 20px;
    gap: 0;
}

html.mobile .footer-accordion.accordion {
    width: 100%;
    margin: 0;
}

html.mobile .footer-accordion .accordion-item {
    margin-bottom: 5px;
}

html.mobile .footer-accordion .accordion-item .content {
    font-size: 12px;
}

html.mobile .footer-accordion .content {
    height: 0;
    padding: 0;
    background-color: rgba(255, 255, 255, 0.06);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    overflow: hidden;
    transition: all 0.3s ease;
}

html.mobile .footer-accordion .accordion-item.is-open .content {
    height: auto;
    padding: 15px;
}

html.mobile .footer-accordion .accordion-icon {
    display: flex;
    align-items: center;
    color: rgba(255, 255, 255, 0.9);
    transition: transform 0.5s ease;
}

html.mobile .footer-accordion .accordion-item.is-open .accordion-icon {
    transform: rotate(180deg);
}

html.mobile .footer-accordion .accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 8px;
    background-color: rgba(255, 255, 255, 0.08);
    cursor: pointer;
    font-weight: bold;
    text-align: left;
}

html.mobile .footer-accordion .accordion-header .accordion-title {
    font-size: 14px;
    color: #fff;
}

html.mobile .footer-accordion .content .footer-link {
    display: block;
    padding: 8px 0;
    color: #696969;
}

@media screen and (max-width: 991.98px) {
    .footer-top {
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 20px 24px;
    }

    .footer-column.footer-brand {
        margin-left: 0;
        align-items: center;
        width: 100%;
    }

    .footer-logo {
        max-width: 80px;
        max-height: 40px;
    }

    .footer-bottom {
        padding: 16px 20px 20px;
        text-align: left;
    }
}