/* ================================================================
 * style.css — 全站样式（含深色模式）
 * 来源：单文件版 记忆.html 的 <style> 块（去掉外层 4 空格缩进，内容未改动）
 * ================================================================ */
:root { --bg:#f5f7fb; --card:#fff; --text:#182430; --muted:#667085; --primary:#2563eb; --border:#e5e7eb; --danger:#ef4444; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; font-size: 14px; }
/* 修复"点标签时其他标签/按钮轻微移动"：切换页后内容高度变化会让垂直滚动条出现或消失，
   居中容器 .app 随之横向跳动。恒定预留滚动条槽位即可消除抖动。 */
html { scrollbar-gutter: stable; }
/* 禁止主页面横向滚动：做题页跳转知识点时 scrollIntoView 在移动端会把底层文档滚偏（左裁右空的根因） */
html, body { overflow-x: hidden; overflow-x: clip; }
@supports not (scrollbar-gutter: stable) { html { overflow-y: scroll; } }
.app { max-width: 1000px; margin: 0 auto; padding: 10px; }
header h1 { font-size: 22px; margin-bottom: 2px; }
.sub { font-size: 12px; color: var(--muted); margin-bottom: 10px; }
nav { display: flex; gap: 6px; margin-bottom: 12px; overflow-x: auto; white-space: nowrap; padding-bottom: 4px; -webkit-overflow-scrolling: touch; overscroll-behavior-x: contain; }
nav::-webkit-scrollbar { display: none; }
nav button { border: 0; background: #e5e7eb; color: #111827; padding: 6px 12px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 13px; flex-shrink: 0; }
nav button.active { background: var(--primary); color: #fff; }
.hidden { display: none !important; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 12px; margin-bottom: 10px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; margin: 10px 0; }
.stat { background: #f8fafc; border: 1px solid var(--border); border-radius: 10px; padding: 8px; text-align: center; }
.stat .label { color: var(--muted); font-size: 11px; }
.stat .num { font-size: 20px; font-weight: 800; }
.btn { border: 0; background: #e5e7eb; color: #111827; padding: 6px 12px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 13px; }
.btn.primary { background: var(--primary); color: #fff; }
.btn.danger { background: #fee2e2; color: var(--danger); }
.btn.success { background: #dcfce7; color: #166534; }
.btn.mini { padding: 3px 8px; font-size: 11px; border-radius: 6px; }
.actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; align-items: center; }
.topline { color: var(--muted); font-size: 12px; margin-bottom: 6px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.badge { padding: 2px 6px; border-radius: 4px; background: #e0e7ff; color: #3730a3; font-size: 11px; font-weight: 700; cursor: pointer; user-select: none; }
.badge.amber { background: #fef3c7; color: #92400e; }
.badge.green { background: #dcfce7; color: #166534; }
.badge.red { background: #fee2e2; color: #991b1b; }
.badge.gray { background: #f3f4f6; color: #6b7280; }
.badge.blue { background: #dbeafe; color: #1e40af; }
.badge.orange { background: #ffedd5; color: #9a3412; }
select.badge { -webkit-appearance: none; appearance: none; border: none; outline: none; padding: 2px 6px; border-radius: 4px; font-size: 11px; font-weight: 700; cursor: pointer; }
select.badge option { background: #fff; color: #333; }
select.badge.gray option { background: #f3f4f6; color: #6b7280; }
select.badge.green option { background: #dcfce7; color: #166534; }
select.badge.blue option { background: #dbeafe; color: #1e40af; }
select.badge.amber option { background: #fef3c7; color: #92400e; }
select.badge.orange option { background: #ffedd5; color: #9a3412; }
select.badge.red option { background: #fee2e2; color: #991b1b; }
.badge.purple { background: #f3e8ff; color: #6b21a8; }
.badge.teal { background: #ccfbf1; color: #115e59; }
.options, .points { display: grid; gap: 6px; margin: 10px 0; }
.choice { display: flex; gap: 8px; align-items: flex-start; background: #f8fafc; border: 1px solid #e2e8f0; padding: 8px; border-radius: 8px; cursor: pointer; font-size: 13px; }
.input, select.input, textarea { width: 100%; padding: 8px; border: 1px solid #cbd5e1; border-radius: 8px; font-size: 14px; background: #fff; }
textarea { min-height: 120px; font-family: inherit; }
.feedback { padding: 8px; border-radius: 8px; font-weight: 700; margin: 10px 0; font-size: 13px; }
.feedback.ok { background: #dcfce7; color: #166534; }
.feedback.bad { background: #fee2e2; color: #991b1b; }
.suggested-rating { outline: 2px dashed var(--primary); outline-offset: 2px; }
.list-view-row.stem-open .text-ellipsis { white-space: normal; overflow: visible; text-overflow: clip; word-break: break-all; }
.muted { color: var(--muted); font-size: 12px; }
.prewrap { white-space: pre-wrap; }
.dropdown { position: relative; display: inline-block; width: 100%; }
.dropdown-toggle { width: 100%; text-align: left; display: flex; justify-content: space-between; align-items: center; background: #fff; border: 1px solid #cbd5e1; padding: 8px; border-radius: 8px; font-size: 13px; color: var(--text); cursor: pointer; }
.dropdown-menu { position: absolute; top: 100%; left: 0; right: 0; background: #fff; border: 1px solid #cbd5e1; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); z-index: 50; margin-top: 4px; max-height: 250px; overflow-y: auto; }
.dropdown-actions { padding: 6px; border-bottom: 1px solid var(--border); display: flex; gap: 6px; background: #f8fafc; position: sticky; top: 0; }
.dropdown-item { display: flex; align-items: center; gap: 6px; padding: 6px 12px; cursor: pointer; font-size: 13px; border-bottom: 1px solid #f1f5f9; }
.dropdown-item:hover { background: #f8fafc; }
.dropdown-item input { margin: 0; width: 14px; height: 14px; }
.dropdown-group-header { display: flex; align-items: center; gap: 4px; padding: 6px 12px; background: #f8fafc; font-weight: bold; border-bottom: 1px solid #e2e8f0; }
.collapse-icon { cursor: pointer; font-size: 10px; width: 16px; text-align: center; transition: transform 0.2s; }
.collapse-icon.expanded { transform: rotate(90deg); }
.dropdown-group-items { padding-left: 20px; }
.filter-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 8px; }
@media (max-width: 500px) { .filter-row { grid-template-columns: 1fr; } }
.drop-zone { border: 2px dashed #cbd5e1; border-radius: 12px; padding: 20px; text-align: center; background: #f8fafc; transition: all 0.2s; cursor: pointer; }
.drop-zone.dragover { border-color: var(--primary); background: #eff6ff; }
.drop-zone p { margin-bottom: 10px; color: var(--muted); font-size: 13px; }
/* 知识库上传进度条（可最小化，最小化后继续在后台跑） */
.kb-prog { position: fixed; right: 16px; bottom: 16px; width: min(360px, calc(100vw - 32px)); background: #fff; border: 1px solid #cbd5e1; border-radius: 10px; box-shadow: 0 6px 24px rgba(0,0,0,0.18); z-index: 200; overflow: hidden; }
body.dark .kb-prog { background: #1e293b; border-color: #475569; }
.kb-prog-head { display: flex; align-items: center; gap: 8px; padding: 8px 10px; font-size: 13px; font-weight: 600; cursor: pointer; user-select: none; }
.kb-prog-head .kb-prog-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-prog-btn { border: 1px solid #cbd5e1; border-radius: 6px; padding: 0 7px; font-size: 12px; color: var(--muted); background: #f8fafc; line-height: 20px; }
body.dark .kb-prog-btn { background: #0f172a; }
.kb-prog-body { padding: 0 10px 10px; }
.kb-prog.min .kb-prog-body { display: none; }
.kb-bar { height: 8px; border-radius: 5px; background: #e2e8f0; overflow: hidden; }
body.dark .kb-bar { background: #334155; }
.kb-bar > div { height: 100%; width: 0%; background: var(--primary); transition: width .2s; }
.kb-prog-log { margin-top: 6px; font-size: 11px; color: var(--muted); max-height: 90px; overflow-y: auto; }
/* 知识库浏览窗口（全屏 + 悬浮控件条，不占内容区） */
.kb-view-bg { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: #f1f5f9; z-index: 150; display: flex; }
body.dark .kb-view-bg { background: #020617; }
/* overflow:clip 而非 hidden：侧栏 translateX 隐藏会产生右侧可滚动溢出，
   搜索结果 scrollIntoView 会把容器横向滚偏 369px（md 左裁右空的真正根因）；clip 容器完全不可滚动 */
.kb-view { background: #fff; width: 100vw; height: 100vh; overflow: hidden; overflow: clip; position: relative; }
body.dark .kb-view { background: #0f172a; }
/* 顶部悬浮标题：无背景、不占浏览区，纯悬浮文件名 + 圆形按钮 */
.kb-view-head { position: absolute; top: 0; left: 0; right: 0; z-index: 26; display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px; pointer-events: none; }
.kb-view-head .kb-name { font-size: 13px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-shadow: 0 1px 8px rgba(255,255,255,.95), 0 0 3px rgba(255,255,255,.85); }
body.dark .kb-view-head .kb-name { text-shadow: 0 1px 8px rgba(0,0,0,.9), 0 0 3px rgba(0,0,0,.8); }
.kb-topbtns { display: flex; gap: 6px; flex-shrink: 0; pointer-events: auto; }
.kb-topbtn { width: 30px; height: 30px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; line-height: 1; cursor: pointer; border: 1px solid rgba(148,163,184,.4); background: rgba(255,255,255,.4); backdrop-filter: blur(10px) saturate(150%); -webkit-backdrop-filter: blur(10px) saturate(150%); box-shadow: 0 4px 12px rgba(15,23,42,.14); }
.kb-topbtn:hover, .kb-topbtn:active { background: rgba(255,255,255,.95); border-color: rgba(148,163,184,.6); }
body.dark .kb-topbtn { background: rgba(30,41,59,.45); }
body.dark .kb-topbtn:hover, body.dark .kb-topbtn:active { background: rgba(30,41,59,.95); }
.kb-view-sline { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; font-weight: 400; }
/* 右侧悬浮搜索面板：毛玻璃浮层，覆盖在预览之上；右上角 FAB 一键收起/展开（同一位置） */
.kb-side { position: absolute; top: 58px; right: 12px; width: clamp(268px, 26vw, 372px); max-height: calc(100vh - 84px); z-index: 24; display: flex; flex-direction: column; gap: 8px; padding: 10px 10px 8px; font-size: 12px; font-weight: 400; border-radius: 14px; background: rgba(255,255,255,.52); backdrop-filter: blur(18px) saturate(180%); -webkit-backdrop-filter: blur(18px) saturate(180%); border: 1px solid rgba(148,163,184,.35); box-shadow: 0 12px 32px rgba(15,23,42,.14); overflow: hidden; transition: transform .22s cubic-bezier(.22,.61,.36,1), opacity .2s ease; }
body.dark .kb-side { background: rgba(15,23,42,.52); border-color: rgba(71,85,105,.55); box-shadow: 0 12px 32px rgba(0,0,0,.45); }
.kb-side.kb-side-min { transform: translateX(calc(100% + 20px)); opacity: 0; pointer-events: none; }
.kb-side-head { display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; }
.kb-side-title { font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
.kb-side-body { display: flex; flex-direction: column; gap: 8px; min-height: 0; }
.kb-side #kbViewCtrls { display: flex; flex-direction: column; gap: 6px; align-items: stretch; flex-shrink: 0; }
/* 右上角悬浮按钮：收起后面板原地滑出，按钮始终在同一位置 */
.kb-fab { position: absolute; top: 58px; right: 12px; z-index: 25; width: 38px; height: 38px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 15px; cursor: pointer; border: 1px solid rgba(148,163,184,.5); background: rgba(255,255,255,.82); backdrop-filter: blur(12px) saturate(160%); -webkit-backdrop-filter: blur(12px) saturate(160%); box-shadow: 0 6px 18px rgba(15,23,42,.18); transition: transform .15s ease, box-shadow .15s ease; }
body.dark .kb-fab { background: rgba(30,41,59,.8); border-color: rgba(100,116,139,.6); }
.kb-fab:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(15,23,42,.24); }
.kb-icon-btn { width: 24px; height: 24px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 12px; line-height: 1; cursor: pointer; border: 1px solid rgba(148,163,184,.45); background: rgba(255,255,255,.65); }
body.dark .kb-icon-btn { background: rgba(51,65,85,.7); }
/* 搜索行：胶囊输入框 + 计数胶囊 + 圆形上下翻 */
.kb-search-row { display: flex; align-items: center; gap: 6px; }
.kb-search-box { position: relative; flex: 1; display: flex; align-items: center; }
.kb-search-box .kb-sIcon { position: absolute; left: 9px; font-size: 11px; opacity: .55; pointer-events: auto; cursor: pointer; }
.kb-search-box input { width: 100%; border: 1px solid rgba(148,163,184,.45); background: rgba(255,255,255,.85); border-radius: 999px; padding: 6px 10px 6px 27px; font-size: 12px; outline: none; color: var(--text); }
body.dark .kb-search-box input { background: rgba(15,23,42,.55); }
.kb-search-box input:focus { border-color: #60a5fa; box-shadow: 0 0 0 3px rgba(96,165,250,.18); }
.kb-chip { min-width: 40px; text-align: center; padding: 2px 8px; border-radius: 999px; background: rgba(148,163,184,.2); font-size: 11px; font-variant-numeric: tabular-nums; color: var(--muted); }
.kb-round { width: 26px; height: 26px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; line-height: 1; cursor: pointer; border: 1px solid rgba(148,163,184,.45); background: rgba(255,255,255,.72); }
body.dark .kb-round { background: rgba(51,65,85,.7); }
.kb-round:hover { background: rgba(226,232,240,.9); }
.kb-sec-label { font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
/* 结果区：可折叠；无结果只占一行 */
.kb-res-wrap { display: flex; flex-direction: column; min-height: 0; border-top: 1px dashed rgba(148,163,184,.55); padding-top: 6px; }
.kb-res-head { display: flex; align-items: center; justify-content: space-between; cursor: pointer; user-select: none; }
.kb-res-empty { padding: 4px 2px; color: var(--muted); font-size: 11px; }
.kb-wrap-min .kb-results, .kb-side .kb-results { flex: 1; min-height: 0; margin-bottom: 0; }
.kb-wrap-min .kb-results { display: none; }
/* 窄屏 / 触摸端的知识库浏览适配统一放在文件末尾「移动端适配」一节，避免规则分散互相覆盖 */
/* 右下角翻页浮钮：平时透明 mini，悬停/点击不透明 */
.kb-pagebar { position: absolute; right: 12px; bottom: 12px; z-index: 24; display: flex; align-items: center; gap: 4px; padding: 5px 7px; border-radius: 999px; background: rgba(255,255,255,.32); backdrop-filter: blur(12px) saturate(150%); -webkit-backdrop-filter: blur(12px) saturate(150%); border: 1px solid rgba(148,163,184,.32); box-shadow: 0 8px 20px rgba(15,23,42,.12); }
body.dark .kb-pagebar { background: rgba(15,23,42,.4); border-color: rgba(71,85,105,.45); }
.kb-navbtn { width: 30px; height: 30px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 11px; line-height: 1; cursor: pointer; border: 1px solid transparent; background: transparent; opacity: .7; transition: opacity .12s ease, background .12s ease; }
.kb-navbtn:hover, .kb-navbtn:active { opacity: 1; background: rgba(255,255,255,.95); border-color: rgba(148,163,184,.55); }
body.dark .kb-navbtn:hover, body.dark .kb-navbtn:active { background: rgba(51,65,85,.95); }
.kb-pagebar .kb-chip { background: rgba(148,163,184,.18); }
/* 左下角缩放浮条：半透明滑条，拖动/悬停时不透明 */
.kb-zoombar { position: absolute; left: 12px; bottom: 12px; z-index: 24; display: flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 999px; background: rgba(255,255,255,.32); backdrop-filter: blur(12px) saturate(150%); -webkit-backdrop-filter: blur(12px) saturate(150%); border: 1px solid rgba(148,163,184,.32); box-shadow: 0 8px 20px rgba(15,23,42,.12); transition: background .15s ease; }
body.dark .kb-zoombar { background: rgba(15,23,42,.4); border-color: rgba(71,85,105,.45); }
.kb-zoombar:hover, .kb-zoombar:focus-within { background: rgba(255,255,255,.85); }
body.dark .kb-zoombar:hover, body.dark .kb-zoombar:focus-within { background: rgba(30,41,59,.9); }
/* ============ 搜索与导航悬浮控件：失去鼠标焦点后降为 50% 透明度 ============
   鼠标移开（或键盘焦点不在其中）→ 半透明让出视线；悬停 / 内部有焦点 → 恢复不透明。
   透明度用变量控制，想调轻/调重改 --kb-idle-opacity 一处即可。 */
:root { --kb-idle-opacity: .5; }
.kb-side, .kb-fab, .kb-zoombar, .kb-pagebar { opacity: var(--kb-idle-opacity); }
.kb-fab, .kb-zoombar, .kb-pagebar { transition: opacity .22s ease, background .15s ease, transform .15s ease, box-shadow .15s ease; }
.kb-side:hover, .kb-side:focus-within,
.kb-fab:hover, .kb-fab:focus-within,
.kb-zoombar:hover, .kb-zoombar:focus-within,
.kb-pagebar:hover, .kb-pagebar:focus-within { opacity: 1; }
.kb-side.kb-side-min { opacity: 0; }   /* 收起态保持完全隐藏，不被上面的规则拉回半透明 */
.kb-zoombar input[type=range] { -webkit-appearance: none; appearance: none; width: 110px; height: 18px; background: transparent; cursor: pointer; }
.kb-zoombar input[type=range]::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: rgba(148,163,184,.45); }
.kb-zoombar input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; margin-top: -5px; border-radius: 50%; background: #3b82f6; border: 2px solid rgba(255,255,255,.9); box-shadow: 0 1px 4px rgba(15,23,42,.3); }
.kb-zoombar input[type=range]::-moz-range-track { height: 4px; border-radius: 2px; background: rgba(148,163,184,.45); }
.kb-zoombar input[type=range]::-moz-range-thumb { width: 12px; height: 12px; border-radius: 50%; background: #3b82f6; border: 2px solid rgba(255,255,255,.9); }
/* 正文绝对定位铺满：不用 flex 布局——flex + absolute 侧栏组合会触发 Chrome 首次布局错位（整体左移 369px 的元凶） */
.kb-view-body { position: absolute; top: 0; left: 0; right: 0; bottom: 0; overflow: auto; padding: 12px 10px 10px; background: #f1f5f9; }
body.dark .kb-view-body { background: #020617; }
.kb-view-body img { max-width: 100%; }
/* ===== 知识库浏览：移动端（触摸缩放/平移）与图片缩放 ===== */
/* 图片预览：宽度由缩放比例驱动（内联 width%），所以这里必须放开 max-width，否则永远卡在 100% 缩放不动 */
.kb-view-body .kb-img-wrap { width: 100%; }
.kb-view-body .kb-img-wrap img { max-width: none; height: auto; display: block; margin: 0 auto; }
/* 打开浏览面板时锁住底层页面滚动（否则触摸会「穿透」到后面的页面）。
   注意挂在 <html> 上而不是 <body>：文档级滚动由 html 承担，只锁 body 挡不住。 */
html.kb-view-lock { overflow: hidden; }
/* 触摸设备首次打开的手势提示（3.4s 后自动淡出，首次触摸立即淡出） */
.kb-touch-hint { position: absolute; left: 50%; transform: translateX(-50%); top: calc(50px + env(safe-area-inset-top, 0px)); z-index: 30; padding: 6px 14px; border-radius: 999px; font-size: 12px; white-space: nowrap; pointer-events: none; color: #334155; background: rgba(255,255,255,.86); border: 1px solid rgba(148,163,184,.45); box-shadow: 0 6px 18px rgba(15,23,42,.16); backdrop-filter: blur(10px) saturate(160%); -webkit-backdrop-filter: blur(10px) saturate(160%); transition: opacity .4s ease, transform .4s ease; }
body.dark .kb-touch-hint { color: #e2e8f0; background: rgba(15,23,42,.86); border-color: rgba(71,85,105,.6); }
.kb-touch-hint.out { opacity: 0; transform: translateX(-50%) translateY(-6px); }
/* 形变缩放预览期间（PDF）：提示浏览器走合成层，并临时禁掉触摸的默认动作 */
#kbViewBody.kb-zoom-preview { touch-action: none; }
/* ===== Word 高保真预览（docx-preview 渲染出来的分页 HTML）=====
   docx-preview 的浏览器版**不带样式文件**：它只把文档自身的样式（styles.xml 等）注入成 <style>，
   所以「纸页」的外观必须我们自己给（白底、居中、页间留白与阴影），否则页面是裸的。
   深色模式下也保持白纸 —— 和 PDF 分支一个口径：文档里的彩色文字是按白底设计的，反色会毁掉配色。 */
.kb-word { width: 100%; }
.kb-word .docx-wrapper { background: transparent; padding: 0; display: block; }
.kb-word section.docx { background: #fff; margin: 0 auto 12px; box-shadow: 0 2px 10px rgba(0,0,0,.18); }
.kb-page-wrap { position: relative; margin: 0 auto 10px; width: max-content; }
/* 连续滚动模式的未渲染占位页 */
.kb-ph-label { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 13px; color: #94a3b8; background: rgba(148,163,184,.12); border-radius: 999px; padding: 3px 12px; }
.kb-page { background: #fff; display: block; box-shadow: 0 2px 8px rgba(0,0,0,.2); }
.kb-hit { position: absolute; background: rgba(250, 204, 21, 0.45); border-radius: 2px; pointer-events: none; }
.kb-hit.cur { background: rgba(249, 115, 22, 0.6); }
.kb-textlayer { position: absolute; inset: 0; overflow: hidden; line-height: 1; }
.kb-textlayer > span { position: absolute; white-space: pre; cursor: text; transform-origin: 0% 0%; color: transparent; }
.kb-textlayer > span::selection { background: rgba(59, 130, 246, 0.4); }
.kb-textlayer > span.kb-hit { background: rgba(250, 204, 21, 0.45); border-radius: 2px; }
.kb-textlayer > span.kb-hit.kb-cur { background: rgba(249, 115, 22, 0.65); }
.kb-sheet table { border-collapse: collapse; font-size: 12px; background: #fff; width: auto; }
.kb-sheet td, .kb-sheet th { border: 1px solid #cbd5e1; padding: 2px 6px; white-space: pre-wrap; }
.kb-sheet th { background: #e2e8f0; position: sticky; top: 0; }
.kb-sheet td.kb-cell-hit { outline: 2px solid #f97316; background: #fed7aa; }
.kb-md { background: #fff; padding: 16px 20px; border-radius: 8px; font-size: 14px; line-height: 1.8; max-width: 900px; margin: 0 auto; overflow-x: auto; overflow-wrap: break-word; }
.kb-xm { background: #fff; border-radius: 8px; padding: 8px; display: inline-block; min-width: 100%; }
.kb-xm svg { display: block; user-select: none; -webkit-user-select: none; margin: 0 auto; }
/* 主题多为「无填充」，不能靠改底色做悬停反馈 → 用外发光提示可点击 */
.kb-xm .xm-node:hover { filter: drop-shadow(0 0 3px rgba(59,130,246,.55)); }
/* 抓手平移：画布默认可抓，拖动中变抓紧 */
#kbViewBody.kb-xm-open { cursor: grab; }
#kbViewBody.kb-xm-open.kb-panning { cursor: grabbing; }
body.dark .kb-xm { background: #0f172a; }
body.dark .kb-md, body.dark .kb-sheet table, body.dark .kb-page { background: #0f172a; color: #e2e8f0; }
body.dark .kb-md { background: #0f172a; }
.kb-md h1, .kb-md h2, .kb-md h3 { margin: 14px 0 8px; line-height: 1.4; }
.kb-md h1 { font-size: 20px; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.kb-md h2 { font-size: 17px; }
.kb-md h3 { font-size: 15px; }
.kb-md p { margin: 6px 0; }
.kb-md ul, .kb-md ol { margin: 6px 0 6px 22px; }
.kb-md code { background: #f1f5f9; padding: 1px 4px; border-radius: 4px; font-size: 12px; }
body.dark .kb-md code { background: #1e293b; }
.kb-md pre { background: #f8fafc; padding: 8px; border-radius: 6px; overflow-x: auto; }
body.dark .kb-md pre { background: #1e293b; }
.kb-md blockquote { border-left: 3px solid #cbd5e1; margin: 8px 0; padding: 2px 10px; color: var(--muted); }
.kb-md table { border-collapse: collapse; margin: 8px 0; font-size: 13px; }
.kb-md th, .kb-md td { border: 1px solid #cbd5e1; padding: 3px 8px; }
.kb-md th { background: #f1f5f9; }
body.dark .kb-md th { background: #1e293b; }
.kb-md mark, .kb-md-hit, .kb-word-hit { background: #fde68a; }
.kb-md img { max-width: 100%; }
.kb-md mark.kb-cur, .kb-md-hit.kb-cur, .kb-word-hit.kb-cur { background: #f97316; color: #fff; }
/* 搜索结果列表 */
.kb-results { overflow-y: auto; background: transparent; border: none; border-radius: 8px; font-size: 12px; }
/* 知识库列表：列宽按内容最小宽度（不折行），整体可横向滚动 */
.kb-table-wrap { overflow-x: auto; }
.kb-table { border-collapse: collapse; width: auto; min-width: 100%; font-size: 12px; white-space: nowrap; }
.kb-table th, .kb-table td { border: 1px solid var(--border); padding: 4px 8px; text-align: left; vertical-align: middle; }
/* 文件名列固定宽度：超长省略号，悬停 title 看全名 */
.kb-table td.kb-fname { max-width: 230px; overflow: hidden; text-overflow: ellipsis; }
.kb-table th { background: #f8fafc; font-weight: 600; }
body.dark .kb-table th { background: #1e293b; }
.kb-table .kb-num { text-align: right; font-variant-numeric: tabular-nums; }
.kb-table .kb-ops { white-space: nowrap; }
.kb-table .kb-ops .btn { margin-right: 3px; }
/* 知识库文件夹「标签条」样式已随 V13 一并移除：
   归类 / 展开折叠统一由「文件管理」页的树（.kb-tfolder 系列）承担，
   上传页只保留列表（.kb-table）。若日后要恢复标签条，可从 git 历史取回。 */
.kb-fsel { font-size: 12px; padding: 1px 4px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: #334155; max-width: 150px; }
body.dark .kb-fsel { background: #0f172a; color: #cbd5e1; }
/* ===== 知识库：双标签页（上传 / 文件管理）===== */
.kb-tabs { display: flex; gap: 6px; margin: 0 0 10px; border-bottom: 1px solid var(--border); }
.kb-tabs button { border: 1px solid var(--border); border-bottom: 0; border-radius: 8px 8px 0 0; background: #f8fafc; color: #475569; font-size: 13px; padding: 6px 14px; cursor: pointer; margin-bottom: -1px; }
.kb-tabs button:hover { color: #2563eb; }
.kb-tabs button.active { background: #fff; color: #2563eb; font-weight: 600; border-color: var(--primary); box-shadow: inset 0 -2px 0 var(--primary); }
body.dark .kb-tabs button { background: #0f172a; color: #cbd5e1; }
body.dark .kb-tabs button.active { background: #1e293b; color: #93c5fd; }
/* ===== 知识库列表工具条（批量操作 + 显示列）===== */
.kb-listbar { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin: 0 0 6px; min-height: 26px; }
.kb-listbar-on { background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 8px; padding: 4px 8px; }
body.dark .kb-listbar-on { background: #172554; border-color: #1e40af; }
.kb-selinfo { font-size: 12px; }
.kb-bsel { font-size: 12px; padding: 2px 6px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: #334155; max-width: 200px; }
body.dark .kb-bsel { background: #0f172a; color: #cbd5e1; }
.kb-listbar-sp { flex: 1; }
.kb-cols { position: relative; }
.kb-cols > summary { list-style: none; cursor: pointer; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: #334155; font-size: 12px; padding: 3px 10px; user-select: none; }
.kb-cols > summary::-webkit-details-marker { display: none; }
.kb-cols[open] > summary { border-color: #2563eb; color: #2563eb; }
body.dark .kb-cols > summary { background: #0f172a; color: #cbd5e1; }
.kb-cols-body { position: absolute; right: 0; top: calc(100% + 4px); z-index: 40; background: #fff; border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 6px 20px rgba(15,23,42,.16); padding: 8px 10px; display: flex; flex-direction: column; gap: 5px; font-size: 12px; min-width: 150px; }
body.dark .kb-cols-body { background: #1e293b; }
.kb-cols-body label { display: flex; align-items: center; gap: 6px; cursor: pointer; white-space: nowrap; }
.kb-cols-all { border-top: 1px solid var(--border); padding-top: 6px; }
/* 列表：可排序列头 / 勾选列 / 选中行 / 分页 */
.kb-table th.kb-sortable { cursor: pointer; user-select: none; }
.kb-table th.kb-sortable:hover { color: #2563eb; }
.kb-sortic { opacity: .55; font-size: 10px; margin-left: 2px; }
.kb-table th.kb-ck, .kb-table td.kb-ck { width: 26px; text-align: center; padding: 4px; }
.kb-table td.kb-namecell { cursor: pointer; }
.kb-table td.kb-namecell:hover b { color: #2563eb; text-decoration: underline; }
.kb-table tr.kb-row-sel > td { background: #eff6ff; }
body.dark .kb-table tr.kb-row-sel > td { background: #1e3a8a; }
.kb-pager { display: flex; align-items: center; gap: 10px; justify-content: center; margin-top: 8px; font-size: 12px; flex-wrap: wrap; }
.kb-pager .btn[disabled] { opacity: .45; cursor: not-allowed; }
/* ===== 知识库：文件管理树（多级分类）===== */
.kb-tfolder, .kb-tfile, .kb-troot { display: flex; align-items: center; gap: 6px; padding: 3px 6px; border-radius: 6px; font-size: 13px; border: 1px solid transparent; }
.kb-tfolder { font-weight: 600; }
.kb-tfolder:hover, .kb-tfile:hover { background: #f8fafc; }
body.dark .kb-tfolder:hover, body.dark .kb-tfile:hover { background: #1e293b; }
.kb-troot { margin-top: 8px; border-top: 1px dashed var(--border); border-radius: 0; padding-top: 8px; font-weight: 600; }
.kb-tdrop.kb-drag-over, .kb-tfolder.kb-drag-over { background: #dbeafe; border-color: #2563eb; }
body.dark .kb-tdrop.kb-drag-over, body.dark .kb-tfolder.kb-drag-over { background: #1e3a8a; border-color: #60a5fa; }
/* 拖动文件夹到兄弟节点的上沿 / 下沿 → 排序提示线（拖到中间才是「放进文件夹」） */
.kb-drop-before { box-shadow: inset 0 2px 0 0 var(--primary); }
.kb-drop-after { box-shadow: inset 0 -2px 0 0 var(--primary); }
.kb-drag-bad { outline: 1px dashed var(--danger); outline-offset: -1px; }
.kb-ticon { flex-shrink: 0; }
.kb-tarrow { cursor: pointer; width: 14px; display: inline-block; text-align: center; color: var(--muted); }
.kb-tname { cursor: pointer; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 60px; }
.kb-tfile .kb-tname { font-weight: 400; }
.kb-tcount { font-size: 11px; color: var(--muted); background: #f1f5f9; border-radius: 999px; padding: 0 7px; flex-shrink: 0; font-variant-numeric: tabular-nums; }
body.dark .kb-tcount { background: #334155; }
.kb-tsub { font-size: 11px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0; text-align: right; margin-left: 8px; }
/* 操作按钮统一贴到最右侧（margin-left:auto），并给同宽按钮，视觉上成一列对齐 */
.kb-tops { display: flex; gap: 4px; flex-shrink: 0; margin-left: auto; align-items: center; cursor: default; }
.kb-tfile .kb-tops .btn.mini { min-width: 54px; }
.kb-tfile, .kb-tfolder { cursor: grab; }
.kb-tfile.kb-dragging, .kb-tfolder.kb-dragging { opacity: .45; }
.kb-addrow { display: flex; align-items: center; gap: 8px; padding: 4px 6px; border-radius: 6px; font-size: 13px; cursor: pointer; }
.kb-addrow:hover { background: #f1f5f9; }
body.dark .kb-addrow:hover { background: #334155; }
.kb-addrow .muted { margin-left: auto; font-size: 11px; }
.kb-result-item { padding: 5px 8px; border-radius: 8px; margin-bottom: 2px; cursor: pointer; display: flex; gap: 8px; }
.kb-result-item:hover { background: rgba(148,163,184,.2); }
.kb-result-item.cur { background: rgba(251,146,60,.3); font-weight: 600; }
.kb-result-item .kb-result-pos { color: var(--muted); flex-shrink: 0; }
.kb-result-item .kb-result-txt { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* 页面内提示（替代 alert，避免被浏览器静默） */
.kb-toast { position: fixed; left: 50%; transform: translateX(-50%); top: 12px; z-index: 300; width: min(640px, calc(100vw - 24px)); background: #fff; border: 1px solid #fca5a5; border-left: 4px solid #dc2626; border-radius: 8px; box-shadow: 0 6px 24px rgba(0,0,0,.18); padding: 10px 12px; font-size: 13px; }
body.dark .kb-toast { background: #1e293b; }
.kb-toast .kb-toast-t { font-weight: 700; margin-bottom: 4px; }
.kb-toast .kb-toast-x { float: right; cursor: pointer; color: var(--muted); }
.kb-diag { margin-top: 8px; background: #f8fafc; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 12px; white-space: pre-wrap; line-height: 1.7; }
body.dark .kb-diag { background: #0f172a; }
details { margin-bottom: 6px; }
summary { cursor: pointer; padding: 8px; background: #f8fafc; border-radius: 8px; font-weight: 600; font-size: 14px; list-style: none; display: flex; justify-content: flex-start; align-items: center; text-align: left; }
summary::-webkit-details-marker { display: none; }
summary::before { content: '▶'; font-size: 10px; margin-right: 8px; transition: transform 0.2s; flex-shrink: 0; }
details[open] > summary::before { transform: rotate(90deg); }
.mastery-subj { background: #e0e7ff; color: #3730a3; }
.mastery-chap { background: #f1f5f9; color: #1e293b; margin-left: 15px; margin-top: 4px; font-size: 13px; }
.mastery-node { margin-left: 30px; padding: 8px; border-left: 2px solid var(--border); font-size: 13px; text-align: left; }
.progress { height: 4px; background: #e5e7eb; border-radius: 2px; overflow: hidden; margin-top: 4px; }
.progress-bar { height: 100%; background: var(--primary); }
.mastery-stats { font-size: 12px; font-weight: normal; color: var(--muted); white-space: nowrap; margin-left: 10px; }
.list-view-row { display: flex; align-items: center; gap: 10px; padding: 8px; border-bottom: 1px solid var(--border); font-size: 13px; scroll-margin-top: 8px; }
.list-view-row:hover { background: #f8fafc; }
.list-view-row.closed { opacity: 0.5; }
.text-ellipsis { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex: 1; }
.list-actions { display: flex; gap: 4px; flex-shrink: 0; }
.inline-practice { margin-top: 10px; padding: 10px; background: #f8fafc; border-radius: 8px; border: 1px solid #e2e8f0; }
.question-row { border: 1px solid var(--border); border-radius: 10px; padding: 10px; margin-bottom: 8px; background: #fff; scroll-margin-top: 8px; }
.question-row.closed { opacity: 0.5; }
.question-row.selected { outline: 2px solid #93c5fd; }
.row-head { display: flex; gap: 8px; align-items: flex-start; }
.modal-bg { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 20px; }
.modal { background: #fff; border-radius: 12px; padding: 20px; width: 100%; max-width: 600px; max-height: 90vh; overflow-y: auto; }
.form-group { margin-bottom: 10px; }
.form-group label { display: block; font-size: 12px; margin-bottom: 4px; font-weight: 600; }
.chart-container { margin: 10px 0; }
.hbar-row { display: flex; align-items: center; gap: 8px; margin: 7px 0; }
.hbar-label { width: 56px; font-size: 12px; color: var(--muted); flex-shrink: 0; text-align: right; }
.hbar-track { flex: 1; height: 20px; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.hbar-fill { height: 100%; border-radius: 10px; min-width: 2px; transition: width 0.3s; }
.hbar-num { width: 58px; font-size: 12px; font-weight: 700; text-align: left; flex-shrink: 0; font-variant-numeric: tabular-nums; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 10px 0; }
.stat-item { background: #f8fafc; border-radius: 8px; padding: 12px; text-align: center; }
.stat-value { font-size: 24px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ===== 设置页标签页（V12.2）===== */
.settings-tabs { display: flex; gap: 6px; overflow-x: auto; white-space: nowrap; margin-bottom: 12px; padding-bottom: 2px; -webkit-overflow-scrolling: touch; overscroll-behavior-x: contain; }
.settings-tabs::-webkit-scrollbar { display: none; }
.settings-tabs button { border: 1px solid var(--border); background: #f8fafc; color: var(--text); padding: 6px 14px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 13px; flex-shrink: 0; }
.settings-tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.set-group { border: 1px solid var(--border); border-radius: 10px; padding: 0 12px 6px; margin-bottom: 12px; }
.gate-dim { opacity: .45; }
.set-group-title { font-size: 13px; font-weight: 700; margin: 10px 0 4px; }
/* 上传时「Word 用哪种方式」的单选卡片 */
.kb-wordpick { display: flex; gap: 8px; align-items: flex-start; font-size: 13px; line-height: 1.5; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 6px; cursor: pointer; }
.kb-wordpick input { margin-top: 3px; flex: 0 0 auto; }
.kb-wordpick:hover { border-color: var(--primary); }
/* ===== 每个设置标签页末尾的「保存」条 =====
   点哪个标签就在哪保存：不用再滚到整页底部，也不用手动切标签去找唯一那个保存按钮。 */
.stab-savebar { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--border); }
.stab-savebar .btn { min-width: 120px; }
/* 设置页里的滑块（透明度等）：各浏览器默认样式差太多，这里统一外观 */
.range { -webkit-appearance: none; appearance: none; width: 100%; height: 22px; background: transparent; cursor: pointer; }
.range::-webkit-slider-runnable-track { height: 5px; border-radius: 3px; background: var(--border); }
.range::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; margin-top: -6.5px; border-radius: 50%; background: var(--primary); border: 2px solid #fff; box-shadow: 0 1px 4px rgba(15,23,42,.3); }
.range::-moz-range-track { height: 5px; border-radius: 3px; background: var(--border); }
.range::-moz-range-thumb { width: 16px; height: 16px; border: 2px solid #fff; border-radius: 50%; background: var(--primary); }
.range:disabled { cursor: not-allowed; }
/* ===== 右下角「日夜快捷切换」悬浮球 =====
   尺寸：46px→23px（按用户要求缩到原来的 50%，图标字号一并减半 21px→11px）。
   opacity 由 JS 按设置写内联样式（默认 55%）；悬停/键盘聚焦时临时恢复不透明，避免"找不到按钮"。
   z-index 刻意低于模态(.modal-bg=100)与知识库浏览面板(.kb-view-bg=150)：那两种场景下它不该浮在最上面。 */
.theme-fab { position: fixed; right: 14px; bottom: 14px; z-index: 90; width: 23px; height: 23px; border: 1px solid rgba(148,163,184,.5); border-radius: 50%; background: #fff; color: #334155; font-size: 11px; line-height: 1; padding: 0; display: flex; align-items: center; justify-content: center; cursor: pointer; box-shadow: 0 3px 9px rgba(15,23,42,.22); transition: opacity .18s ease, transform .15s ease, background .15s ease; -webkit-tap-highlight-color: transparent; }
.theme-fab:hover, .theme-fab:focus-visible { opacity: 1 !important; transform: scale(1.12); }
.theme-fab:active { transform: scale(.9); }
body.dark .theme-fab { background: #1e293b; color: #e2e8f0; border-color: rgba(71,85,105,.65); }
.push-service { border: 1px solid var(--border); border-radius: 10px; background: #fff; }
.push-service summary { background: transparent; border-radius: 10px; }
.var-table { width: 100%; border-collapse: collapse; font-size: 12px; margin: 6px 0 10px; }
.var-table th, .var-table td { border: 1px solid var(--border); padding: 4px 6px; text-align: left; vertical-align: top; }
.var-table th { background: #f8fafc; white-space: nowrap; }
.var-table code { background: #eef2ff; color: #3730a3; padding: 1px 5px; border-radius: 4px; cursor: pointer; font-weight: 700; white-space: nowrap; }
.push-preview { background: #f8fafc; border: 1px dashed var(--border); border-radius: 8px; padding: 6px 8px; font-size: 12px; margin: 8px 0; white-space: pre-wrap; word-break: break-all; color: var(--muted); }


/* ===== 深色（夜间）模式 ===== */
body.dark { --bg:#0f172a; --card:#1e293b; --text:#e2e8f0; --muted:#94a3b8; --border:#334155; --primary:#3b82f6; background:var(--bg); color:var(--text); }
body.dark .card, body.dark .stat, body.dark .question-row, body.dark .stat-item, body.dark .inline-practice { background:var(--card); border-color:var(--border); }
body.dark nav button { background:#334155; color:#e2e8f0; }
body.dark nav button.active { background:var(--primary); color:#fff; }
body.dark .btn { background:#334155; color:#e2e8f0; }
body.dark .btn.primary { background:var(--primary); color:#fff; }
body.dark .btn.danger { background:#7f1d1d; color:#fecaca; }
body.dark .btn.success { background:#14532d; color:#bbf7d0; }
body.dark .input, body.dark select.input, body.dark textarea { background:#0f172a; color:#e2e8f0; border-color:#475569; }
body.dark .choice { background:#0f172a; border-color:#334155; color:var(--text); }
body.dark .muted, body.dark .topline, body.dark .sub, body.dark .bar-label, body.dark .stat .label, body.dark .stat-label, body.dark .mastery-stats { color:var(--muted); }
body.dark .feedback.ok { background:#14532d; color:#bbf7d0; }
body.dark .feedback.bad { background:#7f1d1d; color:#fecaca; }
body.dark .dropdown-toggle { background:#1e293b; color:#e2e8f0; border-color:#475569; }
body.dark .dropdown-menu { background:#1e293b; border-color:#475569; }
body.dark .dropdown-actions { background:#0f172a; border-color:#334155; }
body.dark .dropdown-item { color:#e2e8f0; border-color:#1e293b; }
body.dark .dropdown-item:hover { background:#334155; }
body.dark .dropdown-group-header { background:#0f172a; color:#e2e8f0; border-color:#334155; }
body.dark summary { background:#1e293b; color:#e2e8f0; }
body.dark .mastery-subj { background:#312e81; color:#c7d2fe; }
body.dark .mastery-chap { background:#1e293b; color:#e2e8f0; }
body.dark .mastery-node { border-color:#334155; color:var(--text); }
body.dark .list-view-row { color:#e2e8f0; border-color:#334155; }
body.dark .list-view-row:hover { background:#0f172a; }
body.dark .drop-zone { background:#1e293b; border-color:#475569; }
body.dark .drop-zone p { color:var(--muted); }
body.dark .modal { background:#1e293b; color:#e2e8f0; }
body.dark .chip { background:#0f172a !important; color:#e2e8f0; border-color:#475569; }
body.dark .badge { background:#334155; color:#cbd5e1; }
body.dark .badge.blue { background:#1e3a8a; color:#bfdbfe; }
body.dark .badge.green { background:#14532d; color:#bbf7d0; }
body.dark .badge.red { background:#7f1d1d; color:#fecaca; }
body.dark .badge.gray { background:#334155; color:#94a3b8; }
body.dark .badge.amber { background:#78350f; color:#fde68a; }
body.dark .badge.orange { background:#7c2d12; color:#fed7aa; }
body.dark .badge.purple { background:#581c87; color:#e9d5ff; }
body.dark .badge.teal { background:#134e4a; color:#99f6e4; }
body.dark select.badge option { background:#1e293b; color:#e2e8f0; }
body.dark .stat .num, body.dark .stat-value { color:#e2e8f0; }
body.dark .progress { background:#334155; }
body.dark .question-row.selected { outline-color:#1d4ed8; }
body.dark .settings-tabs button { background: #0f172a; color: var(--text); border-color: #334155; }
body.dark .settings-tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
body.dark .push-service { background: var(--card); border-color: var(--border); }
body.dark .var-table th { background: #0f172a; }
body.dark .var-table code { background: #312e81; color: #c7d2fe; }
body.dark .push-preview { background: #0f172a; border-color: #334155; }


/* ==================================================================
   移动端适配（知识库浏览为主）
   放在文件末尾是故意的：这些规则要盖住上面的桌面默认值，集中一处便于维护。
   两块分工：
     ① @media (pointer: coarse) —— 触摸设备（手机/平板，含平板横屏），与宽度无关的触摸行为
     ② @media (max-width: 720px) —— 窄屏布局（搜索面板改整屏抽屉、浮条错开、底部留白）
   ================================================================== */

/* ① 触摸设备：内容区接管双指手势，按钮放大到可点击尺寸 */
@media (pointer: coarse) {
  /* 全局最外层兜底：整个应用都不做「浏览器/系统双指缩放」。
     viewport 的 user-scalable=no 会被 iOS Safari（及部分国产内核）忽略，而 touch-action 是
     按「第一触点所在元素及其祖先链」取交集的 —— 在根节点也声明一次，就不怕任何落点漏网。
     单指平移（滚动）保留；需要 JS 完全接管手势的画布用 touch-action:none 覆盖。 */
  html, body { touch-action: pan-x pan-y; }
  /* 滚动链不外传、iOS 惯性滚动；手势区用 touch-action 明确「谁负责哪根手指」 */
  .kb-view-body { overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }
  /* 整个浏览面板都禁掉浏览器默认双指缩放：touch-action 只认「第一触点落在哪个元素」，
     手指可能先落在头部/搜索抽屉/背景上，只给内容区加就会漏掉这些落点 → 那段手势归浏览器。
     pan-x pan-y = 保留原生单指平移（长文/表格要滚），但不含 pinch-zoom → 双指缩放交给 JS。 */
  #kbViewHost, .kb-view, .kb-view-bg, .kb-view-head, .kb-side, .kb-view-body { touch-action: pan-x pan-y; }
  /* 思维导图画布：单指平移 + 双指缩放全部由 JS 接管，必须完全禁掉浏览器默认触摸动作 */
  #kbViewBody.kb-xm-open, .kb-view-body.kb-xm-open { touch-action: none; }
  /* 手指比鼠标粗：所有浮钮/浮条按钮统一到 40px 以上 */
  .kb-round, .kb-navbtn, .kb-topbtn, .kb-icon-btn { min-width: 40px; min-height: 40px; font-size: 15px; }
  .kb-fab { width: 46px; height: 46px; font-size: 18px; }
  .kb-zoombar { padding: 7px 12px; gap: 8px; }
  .kb-zoombar input[type=range] { width: 88px; height: 28px; }
  .kb-zoombar input[type=range]::-webkit-slider-thumb { width: 18px; height: 18px; margin-top: -7px; }
  .kb-pagebar { padding: 7px 9px; gap: 6px; }
  /* 手机上「新窗口打开」没有意义（blob 链接在新标签里体验很差），去掉少一个误触目标 */
  #kbViewNew { display: none; }
  .kb-view-head .kb-name { font-size: 12px; }
}

/* ② 窄屏布局 */
@media (max-width: 720px) {
  /* 搜索/导航面板：整屏抽屉，但**必须让开文件头那一行**。
     ⚠️ 别再写成 top:0 —— 文件头 .kb-view-head 的 z-index(26) 高于抽屉(24)，
        铺满全屏时「抽屉的 ✕」和「文件的 ✕」位置重合，点收起搜索会落到关闭文件上。
     抽屉抬到 25：压住底部浮条（24，避免两条浮条压在面板上），仍低于文件头(26)。 */
  .kb-side {
    top: calc(56px + env(safe-area-inset-top, 0px));   /* 文件头 = 6 + 40 + 6，再多留 4px 间隙 */
    left: 8px; right: 8px; bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    width: auto; max-height: none; border-radius: 14px; z-index: 25;
    padding: 10px 12px 12px;
    background: rgba(255,255,255,.97);
  }
  body.dark .kb-side { background: rgba(15,23,42,.97); }
  /* 收起：整块滑出屏幕下方（+20px 保证不留一条边） */
  .kb-side.kb-side-min { transform: translateY(calc(100% + 20px)); }
  .kb-side .kb-results { max-height: none; }
  .kb-side-head { position: sticky; top: 0; }
  /* 抽屉自己的收起钮换成「▾」，与文件头的 ✕ 彻底区分（同一屏两个 ✕ 太容易点错） */
  .kb-side #kbSideToggle { font-size: 0; }
  .kb-side #kbSideToggle::after { content: "▾"; font-size: 16px; }
  /* 头部与浮条让开刘海/圆角，并给内容留出底部浮条高度 */
  .kb-view-head { padding: calc(6px + env(safe-area-inset-top, 0px)) 12px 6px; }
  .kb-view-body { padding: 0 8px calc(78px + env(safe-area-inset-bottom, 0px)); }
  .kb-fab { top: calc(50px + env(safe-area-inset-top, 0px)); right: 10px; }
  /* 浮条左右分居 + 翻页键抬到缩放条上方：窄屏下并排会重叠 */
  .kb-zoombar { left: 10px; bottom: calc(10px + env(safe-area-inset-bottom, 0px)); }
  .kb-pagebar { right: 10px; bottom: calc(68px + env(safe-area-inset-bottom, 0px)); }
  /* 正文：去掉圆角与多余内边距，把宽度还给内容 */
  .kb-md { padding: 12px 14px; border-radius: 0; max-width: none; }
  .kb-xm { padding: 4px; }
  .kb-page-wrap { margin-bottom: 6px; }
  .kb-touch-hint { top: calc(46px + env(safe-area-inset-top, 0px)); font-size: 11px; padding: 5px 12px; }
}

/* ===== 题目里的图片与链接（解析/答案列里直接写 http(s) 链接即可，自动识别） =====
   由 js/02-review.js 的 renderTextRich 生成；图片点击可放大查看。 */
.q-img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 8px 0;
  border-radius: 6px;
  cursor: zoom-in;
  background: var(--bg-secondary, rgba(127,127,127,.08));
}

/* 题目卡上的朗读按钮（🔊）。播放中加 .speaking → 图标换 ⏹ 并脉动，点一下即停 */
.tts-btn { user-select: none; }
.tts-btn:active { transform: scale(0.92); }
.tts-btn.speaking { animation: ttsPulse 1s ease-in-out infinite; box-shadow: 0 0 0 2px rgba(37,99,235,.35); }
@keyframes ttsPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.18); opacity: .72; }
}

/* ===== 题目标签（q.tags）=====
   颜色在生成时内联写死（每题可在弹窗里自定义），这里只负责形状与排布 */
.q-tag {
  display: inline-block;
  font-size: 11px;
  line-height: 1.5;
  padding: 1px 7px;
  margin-left: 4px;
  border-radius: 999px;
  border: 1px solid currentColor;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
}
.q-tag:hover { filter: brightness(.94); }
.tag-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-chip {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  border: 1px solid currentColor; cursor: pointer; background: transparent;
}
.tag-chip.on { box-shadow: 0 0 0 2px rgba(37,99,235,.35); }
.tag-dlg-mask { position: fixed; inset: 0; background: rgba(15,23,42,.45); z-index: 9999; display: flex; align-items: center; justify-content: center; padding: 16px; }
.tag-dlg { background: #fff; color: #111827; border-radius: 10px; padding: 16px; width: 100%; max-width: 420px; max-height: 86vh; overflow: auto; box-shadow: 0 12px 32px rgba(0,0,0,.28); }
.tag-dlg h3 { font-size: 15px; margin: 0 0 10px 0; }
html.dark .tag-dlg { background: #1f2937; color: #e5e7eb; }
html.dark .tag-dlg .input { background: #111827; color: #e5e7eb; border-color: #374151; }