/* ==========================================================================
   资料分享应用样式（Bootstrap 3 之上的设计规范层）
   规范：扁平、细边、12px 圆角、只用 400/500 字重；主色为蓝系色阶
   ========================================================================== */
:root {
    --zl-primary: #1677D2;
    --zl-primary-dark: #0F5CA8;
    --zl-primary-bg: #EAF3FE;
    --zl-primary-border: #BFDBF7;
    --zl-text: #1F2733;
    --zl-text-2: #6B7480;
    --zl-text-3: #9AA3B2;
    --zl-border: #E9ECF1;
    --zl-border-2: #DCE1E9;
    --zl-bg: #F5F6F8;
    --zl-bg-2: #F1F4F8;
    --zl-radius: 12px;
    --zl-radius-sm: 8px;
    --zl-danger: #E24B4A;
    --zl-green: #1F9D6B;
    --zl-amber: #D98806;
    --zl-premium: #F06A2B;
}

* { box-sizing: border-box; }
body {
    background: var(--zl-bg);
    color: var(--zl-text);
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--zl-primary); }
a:hover { color: var(--zl-primary-dark); }

/* ---------------- 顶栏 ---------------- */
.zl-nav { background: #fff; border-bottom: 1px solid var(--zl-border); position: sticky; top: 0; z-index: 100; }
.zl-nav .inner { max-width: 1180px; margin: 0 auto; min-height: 60px; display: flex; align-items: center; gap: 18px; padding: 0 20px; flex-wrap: wrap; }
.zl-brand { font-size: 18px; font-weight: 600; color: var(--zl-primary); text-decoration: none; letter-spacing: .2px; white-space: nowrap; }
.zl-brand:hover { text-decoration: none; color: var(--zl-primary-dark); }
.zl-nav a.zl-link { color: var(--zl-text-2); text-decoration: none; font-size: 14px; padding: 20px 0; border-bottom: 2px solid transparent; transition: color .15s, border-color .15s; white-space: nowrap; }
.zl-nav a.zl-link:hover { color: var(--zl-primary); text-decoration: none; }
.zl-nav a.zl-link.active { color: var(--zl-primary); font-weight: 500; border-bottom-color: var(--zl-primary); }
.zl-nav .spacer { flex: 1; }
.zl-basket-badge { display: inline-block; min-width: 18px; height: 18px; line-height: 18px; padding: 0 5px; border-radius: 9px; background: var(--zl-primary); color: #fff; font-size: 12px; text-align: center; font-weight: 400; }
.zl-btn-login { background: var(--zl-primary); color: #fff !important; border-radius: var(--zl-radius-sm); padding: 6px 16px; font-size: 13px; text-decoration: none; }
.zl-btn-login:hover { background: var(--zl-primary-dark); }
/* 顶栏登出：表单内嵌 + 按钮伪装成链接 */
.zl-logout-form { display: inline; margin: 0; padding: 0; }
.zl-nav button.zl-logout-btn { background: none; border: 0; padding: 20px 0; font-size: 14px; color: var(--zl-text-2); cursor: pointer; border-bottom: 2px solid transparent; transition: color .15s, border-color .15s; white-space: nowrap; font-family: inherit; }
.zl-nav button.zl-logout-btn:hover { color: var(--zl-primary); }

/* 顶栏搜索 */
.zl-search { display: flex; align-items: center; flex: 1; max-width: 420px; min-width: 200px; border: 2px solid var(--zl-primary); border-radius: 4px; overflow: hidden; background: #fff; }
.zl-search input { flex: 1; border: 0; outline: 0; padding: 6px 12px; font-size: 13px; color: var(--zl-text); box-shadow: none; }
.zl-search button { border: 0; background: var(--zl-primary); color: #fff; font-size: 13px; padding: 7px 22px; cursor: pointer; }
.zl-search button:hover { background: var(--zl-primary-dark); }

/* ---------------- 布局 ---------------- */
.zl-wrap { max-width: 1180px; margin: 16px auto 90px; display: flex; gap: 16px; align-items: flex-start; padding: 0 20px; }
.zl-main { flex: 1; min-width: 0; }
.zl-side { width: 236px; flex: none; position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow: auto; }
.zl-side::-webkit-scrollbar { width: 8px; }
.zl-side::-webkit-scrollbar-thumb { background: #D7DDE7; border-radius: 4px; }
.zl-side::-webkit-scrollbar-track { background: transparent; }

.zl-panel { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); margin-bottom: 12px; overflow: hidden; }
.zl-panel-hd { padding: 11px 14px; font-size: 14px; font-weight: 500; color: var(--zl-primary-dark); background: var(--zl-primary-bg); border-bottom: 1px solid var(--zl-primary-border); }
.zl-panel-sub { float: right; font-size: 12px; font-weight: 400; color: var(--zl-text-3); }
.zl-panel #zl-cat-tree, .zl-panel #zl-kn-tree { padding: 8px 8px 10px; max-height: 46vh; overflow: auto; }
.zl-panel #zl-kn-tree { max-height: 42vh; }
.zl-panel #zl-cat-tree::-webkit-scrollbar, .zl-panel #zl-kn-tree::-webkit-scrollbar { width: 8px; }
.zl-panel #zl-cat-tree::-webkit-scrollbar-thumb, .zl-panel #zl-kn-tree::-webkit-scrollbar-thumb { background: #D7DDE7; border-radius: 4px; }
.zl-panel .list-group-item { border: 0; border-radius: 6px !important; font-size: 13px; color: var(--zl-text); padding: 3px 6px; }
.zl-panel .list-group-item.node-selected { background: var(--zl-primary); color: #fff !important; }
.zl-panel .list-group-item:hover { background: var(--zl-primary-bg); }
.zl-panel .list-group-item a { text-decoration: none; }

/* ---------------- 筛选卡 ---------------- */
.zl-filter { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 14px 18px; margin-bottom: 12px; }
.zl-filter .frow { margin-bottom: 10px; display: flex; align-items: center; flex-wrap: wrap; gap: 7px; }
.zl-filter .frow:last-child { margin-bottom: 0; }
.zl-filter .flabel { color: var(--zl-text-3); width: 42px; flex: none; font-size: 13px; }
.zl-chip { display: inline-block; padding: 3px 13px; border: 1px solid var(--zl-border-2); border-radius: 4px; color: var(--zl-text-2); font-size: 13px; text-decoration: none; line-height: 1.6; transition: all .15s; background: #fff; }
.zl-chip:hover { text-decoration: none; color: var(--zl-primary); border-color: var(--zl-primary-border); background: var(--zl-primary-bg); }
.zl-chip.active { background: var(--zl-primary); border-color: var(--zl-primary); color: #fff; font-weight: 500; }
.zl-more-row { border-top: 1px dashed var(--zl-border-2); padding-top: 10px; }
.zl-more-toggle { font-size: 13px; color: var(--zl-text-2); text-decoration: none; }
.zl-more-toggle:hover { color: var(--zl-primary); text-decoration: none; }
.zl-more-badge { font-size: 12px; color: var(--zl-primary); background: var(--zl-primary-bg); border: 1px solid var(--zl-primary-border); border-radius: 10px; padding: 1px 8px; }
#zl-more-panel { border-top: 1px dashed var(--zl-border-2); margin-top: 10px; padding-top: 4px; }
#zl-more-panel .frow { margin-top: 8px; }

/* ---------------- 排序条 ---------------- */
.zl-sortbar { display: flex; align-items: center; gap: 18px; background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 10px 18px; margin-bottom: 12px; flex-wrap: wrap; }
.zl-sorts { display: flex; gap: 4px; }
.zl-sort { font-size: 13px; color: var(--zl-text-2); text-decoration: none; padding: 3px 12px; border-radius: 4px; }
.zl-sort:hover { background: var(--zl-bg-2); text-decoration: none; color: var(--zl-primary); }
.zl-sort.active { background: var(--zl-primary); color: #fff; font-weight: 500; }
.zl-toggle { display: flex; border: 1px solid var(--zl-primary-border); border-radius: 4px; overflow: hidden; }
.zl-tg { font-size: 13px; padding: 3px 16px; text-decoration: none; color: var(--zl-primary); background: #fff; }
.zl-tg:hover { text-decoration: none; background: var(--zl-primary-bg); }
.zl-tg.active { background: var(--zl-primary); color: #fff; }
.zl-total { margin-left: auto; font-size: 13px; color: var(--zl-text-3); }
.zl-total b { color: var(--zl-primary); font-size: 15px; }

/* ---------------- 资料条目 ---------------- */
.zl-list { display: flex; flex-direction: column; gap: 12px; }
.zl-item { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 14px 16px; display: flex; gap: 14px; align-items: stretch; transition: box-shadow .15s, border-color .15s; }
.zl-item:hover { border-color: var(--zl-primary-border); box-shadow: 0 4px 14px rgba(22, 119, 210, .08); }

.zl-item-thumb { position: relative; width: 74px; flex: none; border-radius: var(--zl-radius-sm); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; padding: 8px 4px; color: #fff; min-height: 84px; }
.zl-thumb-ico { font-size: 24px; line-height: 1; }
.zl-thumb-txt { font-size: 11px; line-height: 1.2; opacity: .95; }
.zl-thumb-zip { background: linear-gradient(160deg, #F0A03C, #E07B1E); }
.zl-thumb-pdf { background: linear-gradient(160deg, #EE6E63, #D8453A); }
.zl-thumb-word { background: linear-gradient(160deg, #4C8FE0, #2A6BBF); }
.zl-thumb-ppt { background: linear-gradient(160deg, #F08A4B, #D9611F); }
.zl-thumb-xls { background: linear-gradient(160deg, #3FAE7B, #218A5C); }
.zl-thumb-file { background: linear-gradient(160deg, #94A3B8, #64748B); }
.zl-flag { position: absolute; left: 0; top: 0; font-size: 10px; line-height: 1; padding: 3px 6px; border-radius: var(--zl-radius-sm) 0 6px 0; font-weight: 400; }
.zl-flag-premium { background: var(--zl-premium); color: #fff; }
.zl-flag-free { background: var(--zl-green); color: #fff; }
.zl-flag-lv { background: rgba(0, 0, 0, .22); color: #fff; }

.zl-item-body { flex: 1; min-width: 0; }
.zl-item-title { display: block; font-size: 15.5px; font-weight: 500; color: var(--zl-primary); text-decoration: none; line-height: 1.5; margin-bottom: 7px; }
.zl-item-title:hover { text-decoration: underline; color: var(--zl-primary-dark); }
.zl-item-meta { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 6px; }
.zl-mchip { font-size: 12px; color: var(--zl-text-2); background: var(--zl-bg-2); border-radius: 3px; padding: 1px 8px; line-height: 1.7; }
.zl-mchip-top { background: #FDECEA; color: #D8453A; }
.zl-mchip-cat { background: var(--zl-primary-bg); color: var(--zl-primary-dark); }
.zl-mchip-set { background: #FFF4E5; color: var(--zl-amber); }
.zl-item-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 6px; }
.zl-tag { font-size: 12px; color: var(--zl-text-3); border: 1px solid var(--zl-border-2); border-radius: 3px; padding: 0 7px; line-height: 1.6; }
.zl-item-topic { font-size: 13px; color: var(--zl-text-2); margin-bottom: 5px; }
.zl-item-topic b { color: var(--zl-text); font-weight: 500; }
.zl-item-desc { font-size: 13px; color: var(--zl-text-3); line-height: 1.7; margin-bottom: 7px; }
.zl-item-stats { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--zl-text-3); }

.zl-item-side { width: 116px; flex: none; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; }
.zl-item-pages { font-size: 12px; color: var(--zl-text-3); }
.zl-btn { display: block; width: 100%; text-align: center; font-size: 13px; border-radius: 4px; padding: 7px 0; text-decoration: none; line-height: 1.4; }
.zl-btn-primary { background: var(--zl-primary); color: #fff; border: 1px solid var(--zl-primary); font-weight: 500; }
.zl-btn-primary:hover { background: var(--zl-primary-dark); color: #fff; text-decoration: none; }
.zl-btn-ghost { background: #fff; color: var(--zl-primary); border: 1px solid var(--zl-primary-border); }
.zl-btn-ghost:hover { background: var(--zl-primary-bg); text-decoration: none; }
.zl-btn-ghost[data-added] { color: var(--zl-text-3); border-color: var(--zl-border-2); background: var(--zl-bg-2); cursor: default; }
.zl-collect-mini { font-size: 12px; color: var(--zl-text-3); text-decoration: none; }
.zl-collect-mini:hover { color: var(--zl-amber); text-decoration: none; }
.zl-collect-mini.on { color: var(--zl-amber); }

/* ---------------- 空态 / 分页 ---------------- */
.zl-empty { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); text-align: center; padding: 56px 20px; }
.zl-empty-ico { font-size: 40px; }
.zl-empty-t { margin-top: 10px; font-size: 15px; color: var(--zl-text); }
.zl-empty-d { margin-top: 6px; font-size: 13px; color: var(--zl-text-3); }
.zl-pager { text-align: center; margin: 20px 0 4px; }
.zl-pager .pagination > li > a, .zl-pager .pagination > li > span { color: var(--zl-text-2); border-color: var(--zl-border); border-radius: 6px !important; margin: 0 2px; }
.zl-pager .pagination > .active > a { background: var(--zl-primary); border-color: var(--zl-primary); color: #fff; }

/* ---------------- 底部资源篮条 ---------------- */
.zl-basketbar { position: fixed; right: 26px; bottom: 26px; z-index: 200; background: #fff; border: 1px solid var(--zl-border-2); border-radius: var(--zl-radius); padding: 12px 18px; display: none; align-items: center; gap: 12px; box-shadow: 0 6px 20px rgba(31, 39, 51, .1); }
.zl-basketbar.show { display: flex; }
.zl-basketbar-txt { font-size: 13px; color: var(--zl-text-2); }
.zl-basketbar-txt b { color: var(--zl-primary); font-size: 16px; margin: 0 2px; }
.zl-basketbar .btn-primary { background: var(--zl-primary); border-color: var(--zl-primary); border-radius: 4px; font-size: 13px; }
.zl-basketbar .btn-primary:hover { background: var(--zl-primary-dark); border-color: var(--zl-primary-dark); }
.zl-basketbar .btn-default { border-radius: 4px; font-size: 13px; color: var(--zl-text-2); }

/* ---------------- 提示 ---------------- */
.zl-toast { position: fixed; left: 50%; top: 78px; transform: translate(-50%, -12px); background: #1F2733; color: #fff; font-size: 13px; padding: 9px 20px; border-radius: 6px; z-index: 9999; opacity: 0; transition: all .2s; }
.zl-toast.in { opacity: 1; transform: translate(-50%, 0); }
.zl-toast.ok { background: #1F9D6B; }
.zl-toast.err { background: #D8453A; }

/* ---------------- 详情页 ---------------- */
.zl-detail { display: flex; gap: 16px; align-items: flex-start; }
.zl-detail-main { flex: 1; min-width: 0; background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 22px 26px; }
.zl-detail-side { width: 268px; flex: none; }
.zl-crumb { font-size: 13px; color: var(--zl-text-3); margin-bottom: 12px; }
.zl-crumb a { color: var(--zl-text-2); text-decoration: none; }
.zl-crumb a:hover { color: var(--zl-primary); }
.zl-dtitle { font-size: 20px; font-weight: 600; line-height: 1.5; color: var(--zl-text); margin: 0 0 10px; }
.zl-dmeta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.zl-dstats { display: flex; gap: 20px; flex-wrap: wrap; font-size: 13px; color: var(--zl-text-3); padding: 12px 0; border-top: 1px solid var(--zl-border); border-bottom: 1px solid var(--zl-border); margin-bottom: 16px; }
.zl-dstats b { color: var(--zl-primary); font-weight: 500; }
.zl-dsec { margin-bottom: 18px; }
.zl-dsec-hd { font-size: 14px; font-weight: 500; color: var(--zl-text); margin-bottom: 8px; padding-left: 9px; border-left: 3px solid var(--zl-primary); line-height: 1.2; }
.zl-dsec-body { font-size: 14px; color: var(--zl-text-2); line-height: 1.9; word-break: break-word; }
.zl-dtable { width: 100%; font-size: 13px; }
.zl-dtable td { padding: 7px 0; vertical-align: top; }
.zl-dtable td.k { color: var(--zl-text-3); width: 84px; }
.zl-dtable td.v { color: var(--zl-text); }
.zl-dact { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.zl-dact .btn { border-radius: 4px; font-size: 14px; padding: 8px 26px; }
.zl-dact .btn-dl { background: var(--zl-primary); border-color: var(--zl-primary); color: #fff; font-weight: 500; }
.zl-dact .btn-dl:hover { background: var(--zl-primary-dark); }
.zl-sidecard { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 16px 18px; margin-bottom: 12px; }
.zl-sidecard-hd { font-size: 14px; font-weight: 500; margin-bottom: 10px; color: var(--zl-text); }
.zl-rel { display: block; text-decoration: none; padding: 9px 0; border-bottom: 1px dashed var(--zl-border); }
.zl-rel:last-child { border-bottom: 0; }
.zl-rel:hover { text-decoration: none; }
.zl-rel-t { font-size: 13px; color: var(--zl-text); line-height: 1.6; }
.zl-rel:hover .zl-rel-t { color: var(--zl-primary); }
.zl-rel-m { font-size: 12px; color: var(--zl-text-3); margin-top: 3px; }

/* ---------------- 表单 ---------------- */
.zl-form { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 24px 28px; }
.zl-form .form-group { margin-bottom: 16px; }
.zl-form label { font-size: 13px; color: var(--zl-text-2); font-weight: 400; margin-bottom: 5px; }
.zl-form .req::after { content: ' *'; color: var(--zl-danger); }
.zl-form .form-control { border-radius: 6px; border-color: var(--zl-border-2); box-shadow: none; font-size: 13px; height: 36px; }
.zl-form textarea.form-control { height: auto; }
.zl-form .form-control:focus { border-color: var(--zl-primary-border); box-shadow: 0 0 0 3px rgba(22, 119, 210, .1); }
.zl-form .hint { font-size: 12px; color: var(--zl-text-3); margin-top: 4px; }
.zl-form-actions { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--zl-border); }
.zl-form-actions .btn { border-radius: 4px; font-size: 14px; padding: 8px 30px; }
.zl-form-actions .btn-primary { background: var(--zl-primary); border-color: var(--zl-primary); }
.zl-drop { border: 1px dashed var(--zl-border-2); border-radius: var(--zl-radius-sm); padding: 18px; background: var(--zl-bg-2); text-align: center; }
.zl-drop input[type=file] { font-size: 13px; }

/* ---------------- 资源篮 / 我的 ---------------- */
.zl-tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.zl-tab { font-size: 14px; color: var(--zl-text-2); text-decoration: none; padding: 7px 18px; background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius-sm); }
.zl-tab:hover { text-decoration: none; color: var(--zl-primary); }
.zl-tab.active { background: var(--zl-primary); border-color: var(--zl-primary); color: #fff; font-weight: 500; }
.zl-tab .n { font-size: 12px; opacity: .8; }
.zl-basket-row { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 12px 16px; display: flex; gap: 14px; align-items: center; margin-bottom: 10px; }
.zl-basket-row .zl-item-thumb { width: 60px; min-height: 66px; }
.zl-basket-row .b-main { flex: 1; min-width: 0; }
.zl-basket-row .b-title { font-size: 14px; color: var(--zl-text); text-decoration: none; line-height: 1.5; display: block; margin-bottom: 5px; }
.zl-basket-row .b-title:hover { color: var(--zl-primary); }
.zl-basket-row .b-meta { font-size: 12px; color: var(--zl-text-3); display: flex; gap: 12px; flex-wrap: wrap; }
.zl-basket-row .b-acts { display: flex; gap: 8px; flex: none; }
.zl-basket-bar { background: #fff; border: 1px solid var(--zl-border); border-radius: var(--zl-radius); padding: 12px 18px; display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.zl-basket-bar .sum { font-size: 13px; color: var(--zl-text-2); }

/* ---------------- 通用 ---------------- */
.panel { border-radius: var(--zl-radius); border-color: var(--zl-border); }
.btn { border-radius: var(--zl-radius-sm); }
.btn-primary { background: var(--zl-primary); border-color: var(--zl-primary); }
.btn-primary:hover, .btn-primary:focus { background: var(--zl-primary-dark); border-color: var(--zl-primary-dark); }
.form-control { border-radius: var(--zl-radius-sm); border-color: var(--zl-border-2); box-shadow: none; }
.form-control:focus { border-color: var(--zl-primary-border); box-shadow: 0 0 0 3px rgba(22, 119, 210, .12); }
.alert { border-radius: var(--zl-radius-sm); font-size: 13px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 991px) {
    .zl-side { display: none; }
    .zl-item-side { width: 96px; }
    .zl-search { order: 5; max-width: 100%; flex-basis: 100%; }
}
@media (max-width: 767px) {
    .zl-item { flex-wrap: wrap; }
    .zl-item-side { width: 100%; flex-direction: row; justify-content: flex-start; gap: 10px; }
    .zl-item-side .zl-btn { width: auto; padding: 6px 16px; }
    .zl-detail { flex-direction: column; }
    .zl-detail-side { width: 100%; }
}