/* ============================================================
 * AKSRT Footer — v4.0 Zibll-Inspired
 *
 * 包含：
 * - 页脚主体（Bootstrap Grid）
 * - 浮动右侧按钮组
 * - 移动端底部 Tab 栏
 * ============================================================ */

/* ============================================================
 * 页脚主体
 * ============================================================ */
.site-footer {
    margin-top: auto;
    background: var(--surface-1);
    border-top: 1px solid var(--color-line);
    padding: 30px 0 0;
}

.site-footer__inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 16px;
}

@media (min-width: 768px) {
    .site-footer__inner {
        padding: 0 24px;
    }
}

.site-footer__grid {
    padding-bottom: 32px;
}

.site-footer__brand {
    margin-bottom: 24px;
}

.site-footer__title {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 12px;
    color: var(--color-ink);
}

.site-footer__desc {
    font-size: 0.875rem;
    color: var(--color-ink-4);
    line-height: 1.6;
    margin: 0 0 16px;
    max-width: 360px;
}

.site-footer__col {
    margin-bottom: 24px;
}

.site-footer__col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-footer__col li {
    margin-bottom: 8px;
}

.site-footer__col a {
    font-size: 0.875rem;
    color: var(--color-ink-3);
    transition: color 0.15s ease;
}

.site-footer__col a:hover {
    color: var(--color-primary);
}

/* 社交链接行 */
.social-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.social-row a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--surface-3);
    color: var(--color-ink-3);
    transition: background 0.2s, color 0.2s, transform 0.2s;
}

.social-row a:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.social-row .social-icon-link {
    background: var(--surface-3);
    color: var(--color-ink-3);
}

.social-row .social-icon-link:hover {
    background: var(--color-primary);
    color: #fff;
}

/* 友情链接 */
.site-footer__friends {
    margin-top: 16px;
}

.site-footer__friends-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-ink-4);
    margin: 0 0 8px;
}

.site-footer__friends-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 12px;
}

.site-footer__friends-list a {
    font-size: 0.8125rem;
    color: var(--color-ink-4);
}

.site-footer__friends-list a:hover {
    color: var(--color-primary);
}

/* 底部栏 */
.site-footer__bottom {
    border-top: 1px solid var(--color-line);
    padding: 20px 0;
    text-align: center;
}

.site-footer__filings {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.site-footer__filings a {
    font-size: 0.75rem;
    color: var(--color-ink-4);
}

.site-footer__filings a:hover {
    color: var(--color-primary);
}

.site-footer__copyright {
    font-size: 0.75rem;
    color: var(--color-ink-4);
    margin: 0;
}

/* ============================================================
 * 浮动右侧按钮组（模仿 zibll float-right）
 * ============================================================ */
/* 对齐 zibll: bottom 60px, z-index 1030 */
.float-right-btns {
    position: fixed;
    right: 20px;
    bottom: 60px;
    z-index: 1030;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: opacity 0.3s ease;
}

/* 对齐 zibll: 40px, 1.4em icon */
.float-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    min-height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--float-btn-bg);
    color: var(--color-ink-3);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
    font-size: 1.4em;
    text-decoration: none;
}

.float-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    color: var(--color-primary);
    background: var(--surface-page);
    text-decoration: none;
}

.float-btn:active {
    transform: scale(0.95);
}

/* 回到顶部按钮 — 滚动后显示 */
.float-btn--top {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease;
}

.float-btn--top.is-visible {
    opacity: 1;
    visibility: visible;
    display: flex;
}

/* 主题切换按钮 */
#float-theme-toggle .float-btn__icon-moon {
    display: none !important;
}

#float-theme-toggle .float-btn__icon-sun {
    display: inline-block !important;
}

#float-theme-toggle[aria-pressed="true"] .float-btn__icon-moon,
.theme-dark #float-theme-toggle .float-btn__icon-moon,
html.dark #float-theme-toggle .float-btn__icon-moon {
    display: inline-block !important;
}

#float-theme-toggle[aria-pressed="true"] .float-btn__icon-sun,
.theme-dark #float-theme-toggle .float-btn__icon-sun,
html.dark #float-theme-toggle .float-btn__icon-sun {
    display: none !important;
}

/* 移动端隐藏浮动按钮（用 tabbar 代替） */
@media (max-width: 767px) {
    .float-right-btns {
        right: 12px;
        bottom: 80px;
    }

    .float-btn {
        width: 38px;
        height: 38px;
        font-size: 14px;
    }
}

/* ============================================================
 * 移动端底部 Tab 栏（模仿 zibll footer-tabbar）
 * ============================================================ */
.footer-tabbar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1035;
    min-height: 49px;
    background: var(--blur-bg);
    border-top: 1px solid var(--color-line-soft);
    padding: 0 0 env(safe-area-inset-bottom, 0px);
    justify-content: space-around;
    align-items: center;
    box-shadow: var(--shadow-sm);
    -webkit-backdrop-filter: saturate(5) blur(20px);
    backdrop-filter: saturate(5) blur(20px);
}

.footer-tabbar-placeholder {
    display: none;
    height: calc(49px + env(safe-area-inset-bottom, 0px));
}

@media (max-width: 767px) {
    .footer-tabbar {
        display: flex;
    }

    .footer-tabbar-placeholder {
        display: block;
    }

    /* 有 tabbar 时页脚需要额外底部间距 */
    .site-footer {
        padding-bottom: calc(49px + env(safe-area-inset-bottom, 0px));
    }
}

.tabbar-item {
    display: flex;
    flex: 1 1 0;
    min-width: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1px;
    min-height: 49px;
    padding: 4px 0 3px;
    color: var(--color-ink-4);
    font-size: 13px;
    text-decoration: none;
    border: none;
    background: none;
    cursor: pointer;
    transition: color 0.15s ease;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

/* 对齐 zibll: 24px 图标 */
.tabbar-item i {
    font-size: 24px;
    line-height: 1;
}

.tabbar-item span {
    display: block;
    font-weight: 500;
    line-height: 1;
    transform: scale(0.8);
    transform-origin: center top;
}

.tabbar-item:hover,
.tabbar-item.active {
    color: var(--color-primary);
    text-decoration: none;
}

.tabbar-item.active i {
    font-weight: 900;
}

.tabbar-badge {
    position: absolute;
    top: 2px;
    right: 8px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 999px;
    background: var(--color-error);
    color: #fff;
    font-size: 10px;
    line-height: 16px;
    font-style: normal;
    font-weight: 700;
    text-align: center;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.20);
}

.tabbar-item--add {
    margin-top: -22px;
    width: 62px;
    height: 62px;
    min-height: 62px;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 12px 24px var(--color-accent-shadow);
    flex: 0 0 62px;
    z-index: 1;
}

.tabbar-item--add i {
    font-size: 22px;
}

.tabbar-item--add span {
    font-size: 11px;
}

.tabbar-item--add:hover,
.tabbar-item--add.active {
    color: #fff;
}

.tabbar-add-backdrop {
    position: fixed;
    inset: 0;
    z-index: 951;
    background: rgba(15, 23, 42, 0.38);
}

.tabbar-add-panel {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 952;
    padding: 0 12px calc(84px + env(safe-area-inset-bottom, 0px));
}

.tabbar-add-panel__sheet {
    border-radius: 20px;
    background: var(--surface-page);
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.18);
    overflow: hidden;
}

.tabbar-add-panel__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 18px 12px;
    border-bottom: 1px solid var(--color-line);
}

.tabbar-add-panel__close {
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: var(--surface-2);
    color: var(--color-ink-3);
}

.tabbar-add-panel__list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    padding: 18px;
}

.tabbar-add-panel__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 88px;
    border-radius: 18px;
    background: var(--surface-2);
    color: var(--color-ink-3);
    text-decoration: none;
}

.tabbar-add-panel__item i {
    font-size: 22px;
    color: var(--color-accent);
}

.tabbar-add-panel__item span {
    font-size: 13px;
    font-weight: 600;
}

.tabbar-search-overlay {
    position: fixed;
    inset: 0;
    z-index: 953;
    background: rgba(15, 23, 42, 0.58);
    display: flex;
    align-items: stretch;
    justify-content: center;
}

.tabbar-search-overlay__dialog {
    width: 100%;
    min-height: 100%;
    background: var(--surface-page);
    padding: 18px 16px calc(24px + env(safe-area-inset-bottom, 0px));
}

.tabbar-search-overlay__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.tabbar-search-overlay__close {
    width: 36px;
    height: 36px;
    border: 0;
    border-radius: 50%;
    background: var(--surface-2);
    color: var(--color-ink-3);
}

.tabbar-search-overlay__form {
    display: grid;
    grid-template-columns: 20px 1fr auto;
    gap: 10px;
    align-items: center;
    padding: 14px 14px 14px 12px;
    border-radius: 18px;
    background: var(--surface-2);
}

.tabbar-search-overlay__icon {
    color: var(--color-ink-4);
}

.tabbar-search-overlay__form input {
    min-width: 0;
    border: 0;
    background: transparent;
    color: var(--color-ink);
    font-size: 15px;
    outline: none;
}

.tabbar-search-overlay__submit {
    border: 0;
    border-radius: 12px;
    padding: 10px 14px;
    background: var(--color-accent);
    color: #fff;
    font-weight: 700;
}

.tabbar-search-overlay__types {
    display: flex;
    gap: 8px;
    margin-top: 14px;
}

.tabbar-search-overlay__type {
    border: 0;
    border-radius: 999px;
    padding: 9px 14px;
    background: var(--surface-2);
    color: var(--color-ink-3);
    font-size: 13px;
    font-weight: 600;
}

.tabbar-search-overlay__type.is-active {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

.tabbar-search-overlay__section {
    margin-top: 20px;
}

.tabbar-search-overlay__section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.tabbar-search-overlay__label {
    color: var(--color-ink-3);
    font-size: 13px;
    font-weight: 700;
}

.tabbar-search-overlay__clear {
    border: 0;
    background: transparent;
    color: var(--color-accent);
    font-size: 12px;
    font-weight: 700;
}

.tabbar-search-overlay__history,
.tabbar-search-overlay__suggestions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tabbar-search-overlay__history-item,
.tabbar-search-overlay__suggestion-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    border: 0;
    border-radius: 16px;
    padding: 12px 14px;
    background: var(--surface-2);
    color: var(--color-ink-3);
    text-decoration: none;
    text-align: left;
}

.tabbar-search-overlay__history-item i {
    color: var(--color-accent);
}

.tabbar-search-overlay__history-item span,
.tabbar-search-overlay__suggestion-item span {
    flex: 1;
    min-width: 0;
    font-size: 14px;
    font-weight: 600;
}

.tabbar-search-overlay__suggestion-item small {
    color: var(--color-ink-4);
    font-size: 12px;
}

.tabbar-search-overlay__empty {
    padding: 14px;
    border-radius: 16px;
    background: var(--surface-2);
    color: var(--color-ink-4);
    font-size: 13px;
    text-align: center;
}

.tabbar-search-overlay__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tabbar-search-overlay__tag {
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--surface-2);
    color: var(--color-ink-3);
    text-decoration: none;
    font-size: 13px;
}

body.tabbar-search-open,
body.tabbar-add-open {
    overflow: hidden;
}

/* 滚动时隐藏 tabbar（可选，通过 JS 添加 class） */
.footer-tabbar.scrolling-hide {
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

/* 向下滚动隐藏，向上滚动显示 */
.footer-tabbar.scroll-down-hide {
    transition: transform 0.3s ease;
}

.footer-tabbar.scroll-down-hide.is-hidden {
    transform: translateY(120%);
}

/* 返回顶部包裹项（首页按钮 + 返回顶部切换） */
.tabbar-ontop-wrap {
    position: relative;
}

.tabbar-ontop-wrap .tabbar-ontop-btn {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 4px 12px;
    color: var(--color-primary);
    font-size: 13px;
    text-decoration: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.tabbar-ontop-wrap .tabbar-ontop-btn i {
    font-size: 18px;
    line-height: 1;
}

.tabbar-ontop-wrap .tabbar-ontop-btn span {
    font-weight: 500;
    line-height: 1;
    transform: scale(0.8);
    transform-origin: center top;
}

.tabbar-ontop-wrap.is-scrolled .tabbar-ontop-btn {
    display: flex;
}

.tabbar-ontop-wrap.is-scrolled > .tabbar-item:not(.tabbar-ontop-btn) {
    opacity: 0;
    pointer-events: none;
}

/* ============================================================
 * 暗色模式适配
 * ============================================================ */
.theme-dark .site-footer,
html.dark .site-footer {
    background: var(--surface-1);
}

.theme-dark .float-btn,
html.dark .float-btn {
    background: var(--float-btn-bg);
    box-shadow: var(--shadow-sm);
}

.theme-dark .footer-tabbar,
html.dark .footer-tabbar {
    background: var(--blur-bg);
    box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.20);
}

/* ============================================================
 * 旧版 back-to-top 按钮兼容（隐藏，用浮动按钮代替）
 * ============================================================ */
.back-to-top {
    display: none !important;
}

/* ============================================================
 * 页脚布局模板变体
 * ============================================================ */

/* 紧凑模板：单行版权 + 链接 */
.site-footer--compact .site-footer__grid {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
}

.site-footer--compact .site-footer__brand {
    flex: 1 1 100%;
}

.site-footer--compact .site-footer__brand .site-footer__desc,
.site-footer--compact .site-footer__brand .social-row,
.site-footer--compact .site-footer__brand .site-footer__friends {
    display: none;
}

.site-footer--compact .site-footer__col {
    flex: 0 0 auto;
}

.site-footer--compact .site-footer__col ul {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-footer--compact .site-footer__bottom {
    border-top: 1px solid var(--color-line);
    padding-top: 12px;
    margin-top: 12px;
}

/* 中央模板：居中品牌 + 链接 */
.site-footer--centered .site-footer__grid {
    text-align: center;
}

.site-footer--centered .site-footer__brand {
    flex: 1 1 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.site-footer--centered .site-footer__col {
    flex: 1 1 auto;
}

.site-footer--centered .site-footer__col ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}