/* 资料文库主体：同一分类树按屏幕尺寸显示为侧栏、抽屉或底部面板。 */
.ui-site .library-page {
    --library-primary: #1677FF;
    --library-heading: #102A56;
    --library-text: #334155;
    --library-muted: #64748B;
    --library-border: #E2EAF4;
    --library-selected: #EAF3FF;
    padding: 24px 0 40px;
    color: var(--library-text);
    background: linear-gradient(180deg, #EFF7FF 0, #F5F8FC 300px);
}
.library-page .library-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); align-items: start; gap: 24px; }
.library-page .library-results { min-width: 0; outline: 0; scroll-margin-top: calc(var(--header-height, 64px) + 20px); }
.library-page .library-breadcrumb { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 7px; margin: 4px 0 18px; color: var(--library-muted); font-size: 13px; line-height: 1.7; overflow-wrap: anywhere; }
.library-page .library-breadcrumb a { color: inherit; }
.library-page .library-breadcrumb a:hover { color: var(--library-primary); }
.library-page .library-breadcrumb [aria-hidden] { color: #94A3B8; }
.library-page .library-heading { margin-bottom: 24px; }
.library-page .library-heading h1 { margin: 0 0 8px; color: var(--library-heading); font-size: 28px; font-weight: 700; line-height: 1.4; overflow-wrap: anywhere; }
.library-page .library-heading p { margin: 0; color: var(--library-muted); font-size: 14px; line-height: 1.7; }
.library-page .library-category-trigger { display: none; }

/* 常驻分类栏 */
.library-page .library-category-container { min-width: 0; position: sticky; top: calc(var(--header-height, 64px) + 16px); }
.library-page .library-category-panel { display: flex; flex-direction: column; max-height: calc(100vh - var(--header-height, 64px) - 40px); max-height: calc(100dvh - var(--header-height, 64px) - 40px); background: #FFFFFF; border: 1px solid var(--library-border); border-radius: 12px; outline: 0; }
.library-page .library-category-header { display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; gap: 12px; padding: 16px; background: #F7FBFF; border-bottom: 1px solid var(--library-border); border-radius: 12px 12px 0 0; }
.library-page .library-category-header h2 { display: flex; align-items: center; gap: 9px; margin: 0; color: var(--library-heading); font-size: 18px; font-weight: 700; line-height: 1.5; }
.library-page .library-category-header h2 svg { flex-shrink: 0; width: 22px; height: 22px; color: var(--library-primary); }
.library-page .library-category-dialog-title, .library-page .library-category-close, .library-page .library-category-footer, .library-page .library-category-backdrop { display: none; }
.library-page .library-category-scroll { flex: 1; min-height: 0; padding: 10px 8px 16px; overflow-y: auto; overflow-x: hidden; overscroll-behavior: contain; scrollbar-width: thin; scrollbar-color: #C5D8EF transparent; }
.library-page .library-all-row { margin-bottom: 6px; }
.library-page .library-category-tree, .library-page .library-tree-children { list-style: none; padding: 0; }
.library-page .library-category-tree { margin: 0; }
.library-page .library-tree-node { min-width: 0; }
.library-page .library-tree-row { display: flex; align-items: flex-start; min-width: 0; padding-left: min(calc(var(--library-depth, 0) * 16px), 80px); border-radius: 8px; }
.library-page .library-tree-row:hover { background: #F0F7FF; }
.library-page .library-tree-row.is-selected { color: var(--library-primary); background: var(--library-selected); }
.library-page .library-category-link { display: flex; align-items: flex-start; flex: 1; min-width: 0; gap: 8px; min-height: 44px; padding: 11px 8px; color: var(--library-muted); font-size: 13px; line-height: 1.65; border-radius: 8px; }
.library-page .library-category-link.is-branch { color: var(--library-heading); font-weight: 600; }
.library-page .library-category-tree > .library-tree-node > .library-tree-row > .library-category-link { font-size: 14px; font-weight: 700; }
.library-page .library-tree-row.is-selected .library-category-link { color: var(--library-primary); }
.library-page .library-category-link:hover { color: var(--library-primary); }
.library-page .library-category-link > svg { width: 16px; height: 16px; margin-top: 2px; flex-shrink: 0; color: var(--library-primary); }
.library-page .library-category-name { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.library-page .library-category-dot { flex: 0 0 6px; width: 6px; height: 6px; margin: 8px 5px 0; background: var(--library-primary); border-radius: 50%; }
.library-page .library-category-link .library-category-check { display: none; }
.library-page .library-tree-children { margin: 0 0 6px; padding: 0; }
.library-page .library-tree-children > .library-tree-node { position: relative; }
.library-page .library-tree-children > .library-tree-node::before { content: ""; position: absolute; top: 0; bottom: 0; left: min(calc(var(--library-depth) * 16px - 8px), 72px); width: 1px; background: #DDE9F7; pointer-events: none; }
.library-page .library-tree-children > .library-tree-node::after { content: ""; position: absolute; top: 22px; left: min(calc(var(--library-depth) * 16px - 8px), 72px); width: 8px; height: 1px; background: #DDE9F7; pointer-events: none; }
.ui-site .library-page .library-category-toggle { display: flex; align-items: center; justify-content: center; flex: 0 0 32px; width: 32px; min-height: 44px; padding: 0; color: var(--library-muted); background: transparent; border: 0; border-radius: 8px; cursor: pointer; }
.library-page .library-category-toggle svg { width: 15px; height: 15px; transform: rotate(-90deg); }
.library-page .library-category-toggle[aria-expanded="true"] svg { transform: rotate(0); }
.library-page .library-category-toggle:hover { color: var(--library-primary); background: rgba(22, 119, 255, .06); }
.library-page .library-category-empty { margin: 0; padding: 16px 8px; color: var(--library-muted); font-size: 13px; }
.library-page [hidden] { display: none !important; }

/* 现有检索与真实结果 */
.ui-site .library-page .library-search { display: flex; align-items: center; gap: 12px; margin: 0 0 22px; padding: 4px 4px 4px 16px; background: #FFFFFF; border: 1px solid var(--library-border); border-radius: 8px; box-shadow: 0 2px 8px rgba(16, 42, 86, .025); }
.library-page .library-search:focus-within { border-color: var(--library-primary); box-shadow: 0 0 0 3px rgba(22, 119, 255, .12); }
.library-page .library-search > svg { flex: 0 0 20px; width: 20px; height: 20px; color: var(--library-muted); }
.ui-site #main-content .library-page .library-search-input { flex: 1; min-width: 0; width: 0; max-width: 100%; height: 44px; margin: 0; padding: 0; color: var(--library-text); background: transparent; border: 0; border-radius: 0; box-shadow: none; font: inherit; font-size: 14px; }
.ui-site #main-content .library-page .library-search-input:focus { outline: 0; border: 0; box-shadow: none; }
.library-page .library-search-input::placeholder { color: #94A3B8; }
.ui-site .library-page .library-search-button { flex-shrink: 0; min-width: 84px; min-height: 44px; padding: 0 20px; color: #FFFFFF; background: var(--library-primary); border: 0; border-radius: 8px; font-size: 14px; font-weight: 600; cursor: pointer; }
.library-page .library-search-button:hover { background: #0969E8; }
.library-page .library-result-count { margin: 0 0 16px; color: var(--library-muted); font-size: 14px; line-height: 1.6; }
.library-page .library-result-count strong { margin: 0 3px; color: var(--library-heading); font-weight: 600; }
.library-page .library-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.library-page .library-card { min-width: 0; background: #FFFFFF; border: 1px solid var(--library-border); border-radius: 12px; transition: border-color .18s, background-color .18s; }
.library-page .library-card:hover { background: #F0F7FF; border-color: #B4D5FF; }
.library-page .library-card-link { display: flex; align-items: center; gap: 20px; padding: 18px 16px; color: inherit; border-radius: 12px; }
.library-page .library-card-link:hover { color: inherit; }
.library-page .library-file-icon { display: flex; align-items: center; justify-content: center; flex: 0 0 56px; width: 56px; height: 60px; color: var(--library-primary); background: var(--library-selected); border-radius: 10px; }
.library-page .library-file-icon svg { width: 28px; height: 35px; }
.library-page .library-card-info { flex: 1; min-width: 0; }
.library-page .library-card-info h2 { margin: 0; color: var(--library-heading); font-size: 17px; font-weight: 600; line-height: 1.5; overflow-wrap: anywhere; }
.library-page .library-card-description { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; margin: 4px 0 0; color: var(--library-muted); font-size: 14px; line-height: 1.65; overflow-wrap: anywhere; }
.library-page .library-card-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 5px 18px; margin-top: 9px; color: var(--library-muted); font-size: 12px; line-height: 1.6; font-variant-numeric: tabular-nums; }
.library-page .library-card-meta > span { display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.library-page .library-card-meta svg { flex-shrink: 0; width: 15px; height: 15px; }
.library-page .library-card-chevron { flex: 0 0 18px; width: 18px; height: 18px; color: var(--library-muted); }
.library-page .library-empty { padding: 40px 16px; color: var(--library-muted); background: #FFFFFF; border: 1px solid var(--library-border); border-radius: 12px; text-align: center; }
.library-page .library-empty p { margin: 0; font-size: 14px; }
.library-page .library-pagination { margin-top: 20px; }
.ui-site .library-page .library-pagination .page, .ui-site .library-page .library-pagination #pages { margin-top: 0; }
.ui-site .library-page .library-pagination #pages { gap: 6px; padding: 0; }
.ui-site .library-page .library-pagination .page ul li a, .ui-site .library-page .library-pagination .page ul li span { margin: 0; }
.ui-site .library-page .library-pagination .page ul li.disabled > span { cursor: default; }
.ui-site .library-page .library-pagination .page ul li.active span { background: var(--library-primary); border-color: var(--library-primary); }
.library-page .library-sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.library-page a:focus-visible, .library-page button:focus-visible { outline: 2px solid var(--library-primary); outline-offset: -2px; }

/* iPad：右侧分类抽屉，资料保持单列。 */
@media (max-width: 1100px) {
    .library-page .library-layout { display: block; }
    .library-page .library-heading { margin-bottom: 18px; }
    .library-page .library-heading h1 { font-size: 26px; }
    .ui-site .library-page .library-category-trigger { position: sticky; top: calc(var(--library-header-offset, var(--header-height, 64px)) + 8px); z-index: 900; display: flex; align-items: center; gap: 10px; width: 100%; min-height: 48px; margin: 0 0 12px; padding: 10px 14px; color: var(--library-heading); background: #FFFFFF; border: 1px solid var(--library-border); border-radius: 8px; box-shadow: 0 3px 10px rgba(16, 42, 86, .06); text-align: left; cursor: pointer; }
    .library-page .library-category-trigger > svg { width: 20px; height: 20px; flex-shrink: 0; color: var(--library-primary); }
    .library-page .library-category-trigger > span { flex: 1; min-width: 0; font-size: 14px; font-weight: 600; overflow-wrap: anywhere; }
    .library-page .library-category-trigger .library-picker-chevron { width: 16px; height: 16px; margin-left: auto; color: var(--library-muted); }
    .library-page .library-category-trigger .library-picker-mobile-label { display: none; }
    .library-page .library-category-container { display: none; position: fixed; inset: 0; z-index: 100000; }
    .library-page .library-category-container.is-open { display: block; }
    .library-page .library-category-backdrop { display: block; position: absolute; inset: 0; background: rgba(15, 23, 42, .4); }
    .library-page .library-category-panel { position: absolute; inset: 0 0 0 auto; width: min(380px, 88vw); max-height: none; height: 100%; background: #FFFFFF; border: 0; border-left: 1px solid var(--library-border); border-radius: 12px 0 0 12px; box-shadow: -8px 0 32px rgba(16, 42, 86, .12); }
    .library-page .library-category-header { min-height: 64px; padding: 10px 12px 10px 20px; background: #FFFFFF; border-radius: 12px 0 0 0; }
    .library-page .library-category-header h2 { font-size: 17px; }
    .library-page .library-category-header h2 > svg, .library-page .library-category-desktop-title { display: none; }
    .library-page .library-category-dialog-title { display: inline; }
    .ui-site .library-page .library-category-close { display: flex; align-items: center; justify-content: center; flex-shrink: 0; width: 44px; height: 44px; padding: 0; color: var(--library-muted); background: transparent; border: 0; border-radius: 8px; cursor: pointer; }
    .library-page .library-category-close svg { width: 22px; height: 22px; }
    .library-page .library-category-close:hover { color: var(--library-primary); background: #F0F7FF; }
    .library-page .library-category-scroll { padding: 12px 12px 24px; }
    .library-page .library-category-link { font-size: 14px; }
    .ui-site .library-page .library-category-toggle { flex-basis: 44px; width: 44px; }
    .library-page .library-card-link { gap: 16px; padding: 16px; }
    .library-page .library-card-info h2 { font-size: 16px; }
    .library-page .library-search { margin-bottom: 18px; }
}

/* H5：选择先暂存，确定后再切换分类。 */
@media (max-width: 600px) {
    .ui-site .library-page { padding: 20px 0 28px; }
    .library-page .library-breadcrumb { margin: 0 0 14px; font-size: 12px; }
    .library-page .library-heading { margin-bottom: 16px; }
    .library-page .library-heading h1 { font-size: 24px; }
    .library-page .library-heading p { font-size: 13px; }
    .library-page .library-category-trigger .library-picker-tablet-label { display: none; }
    .library-page .library-category-trigger .library-picker-mobile-label { display: inline; }
    .library-page .library-category-panel { inset: auto 0 0; width: 100%; height: 84vh; height: 84dvh; border: 0; border-radius: 16px 16px 0 0; box-shadow: 0 -8px 32px rgba(16, 42, 86, .12); }
    .library-page .library-category-header { min-height: 64px; padding: 12px 12px 8px 20px; border-radius: 16px 16px 0 0; }
    .library-page .library-category-header::before { content: ""; position: absolute; top: 5px; left: calc(50% - 20px); width: 40px; height: 4px; background: #CBD5E1; border-radius: 99px; }
    .library-page .library-category-scroll { padding-top: 8px; padding-bottom: 12px; }
    .library-page .library-tree-row.is-selected .library-category-check { display: block; width: 17px; height: 17px; }
    .library-page .library-category-footer { display: flex; justify-content: flex-end; flex-shrink: 0; gap: 12px; padding: 12px 16px max(12px, env(safe-area-inset-bottom)); background: #FFFFFF; border-top: 1px solid var(--library-border); }
    .ui-site .library-page .library-category-footer button { min-height: 44px; min-width: 88px; padding: 0 18px; border: 1px solid var(--library-border); border-radius: 8px; font-size: 14px; cursor: pointer; }
    .ui-site .library-page .library-category-cancel { color: var(--library-muted); background: #FFFFFF; }
    .ui-site .library-page .library-category-confirm { color: #FFFFFF; background: var(--library-primary); border-color: var(--library-primary); font-weight: 600; }
    .ui-site .library-page .library-search { gap: 8px; padding-left: 12px; margin-bottom: 16px; }
    .library-page .library-search > svg { flex-basis: 18px; width: 18px; height: 18px; }
    .ui-site #main-content .library-page .library-search-input { font-size: 16px; }
    .library-page .library-search-input::placeholder { font-size: 13px; }
    .ui-site .library-page .library-search-button { min-width: 62px; padding: 0 12px; font-size: 13px; }
    .library-page .library-result-count { margin-bottom: 12px; font-size: 13px; }
    .library-page .library-list { gap: 10px; }
    .library-page .library-card-link { align-items: flex-start; gap: 10px; padding: 14px 12px; }
    .library-page .library-file-icon { flex-basis: 42px; width: 42px; height: 48px; border-radius: 8px; }
    .library-page .library-file-icon svg { width: 23px; height: 29px; }
    .library-page .library-card-info h2 { font-size: 15px; }
    .library-page .library-card-description { font-size: 13px; }
    .library-page .library-card-meta { gap: 5px 12px; margin-top: 8px; font-size: 12px; }
    .library-page .library-card-meta > span { gap: 4px; }
    .library-page .library-card-meta svg { width: 13px; height: 13px; }
    .library-page .library-card-chevron { align-self: center; flex-basis: 14px; width: 14px; height: 18px; }
}
@media (prefers-reduced-motion: reduce) {
    .library-page .library-card { transition: none; }
}