/* VeloWiki reader surfaces use the shared light theme tokens from theme.css. */
.velowiki-page { min-width: 0; background: var(--bg); }
button, select, input, textarea { font: inherit; color: inherit; }
button { min-height: 36px; }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--teal); outline-offset: 3px; }

.wiki-topbar { position: sticky; top: 0; z-index: 20; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1rem; min-height: 64px; padding: .65rem clamp(1rem, 3vw, 3rem); border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .94); backdrop-filter: blur(16px); }
.wiki-brand { display: grid; gap: .05rem; min-height: 44px; align-content: center; color: var(--teal); font-family: Georgia, "Source Han Serif SC", serif; }
.wiki-brand span { color: var(--muted); font: 500 .66rem/1.2 ui-sans-serif, system-ui, sans-serif; }
.wiki-brand strong { font-size: 1.08rem; }
.wiki-primary-nav { display: flex; justify-content: center; gap: .3rem; }
.wiki-primary-nav button, .wiki-primary-nav a { min-height: 38px; display: grid; place-items: center; padding: 0 .7rem; border: 0; border-radius: 7px; background: transparent; color: var(--muted); font-size: .82rem; font-weight: 700; cursor: pointer; white-space: nowrap; }
.wiki-primary-nav button:hover, .wiki-primary-nav button[aria-pressed="true"], .wiki-primary-nav a:hover, .wiki-primary-nav a[aria-current="page"] { background: #efede8; color: var(--ink); }
.wiki-products-link { min-height: 38px; display: grid; place-items: center; padding: 0 .15rem; color: var(--muted); font-size: .78rem; font-weight: 700; }
.wiki-products-link:hover { color: var(--teal); }
.wiki-topbar-actions { display: flex; align-items: center; gap: .9rem; }
/* Keep the shared account widget aligned with the topbar's 36px control floor
   (shared-account.css defaults its buttons to 34px). */
.wiki-topbar .velo-account button { min-height: 36px; }

.wiki-shell { width: min(1360px, calc(100% - 2rem)); margin: 0 auto; padding: 1.5rem 0 4rem; }
.wiki-course-header { display: flex; justify-content: space-between; gap: 2rem; align-items: end; padding: 0 0 1.3rem; border-bottom: 1px solid var(--line); }
.wiki-course-header > * { min-width: 0; }
.wiki-kicker { margin: 0 0 .45rem; color: var(--teal); font-size: .7rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.wiki-course-header h1, .wiki-section-heading h2 { margin: 0; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; letter-spacing: 0; }
.wiki-course-header h1 { max-width: 26ch; font-size: clamp(2rem, 3.5vw, 3.25rem); line-height: 1.12; }
.wiki-course-header p { max-width: 54rem; margin-bottom: 0; color: var(--muted); line-height: 1.7; }
.wiki-field, .wiki-search-field { display: grid; gap: .35rem; color: var(--muted); font-size: .8rem; font-weight: 700; }
.wiki-field input, .wiki-field textarea, .wiki-search-field input { min-width: 0; min-height: 42px; padding: .6rem .7rem; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); }
.wiki-status { min-height: 1.4rem; margin: .7rem 0; color: var(--muted); font-size: .84rem; }
.wiki-status.is-warning { color: var(--orange); }

.wiki-reader-layout { display: grid; grid-template-columns: minmax(190px, .62fr) minmax(0, 2fr) minmax(215px, .72fr); gap: clamp(1rem, 2.4vw, 2.4rem); align-items: stretch; }
/* Desktop reading is a fixed-viewport app area: the page itself does not
   scroll, and only the middle article column scrolls. */
.wiki-reader-nav, .wiki-reader-content, .wiki-reader-context { min-height: 0; }
.wiki-reader-nav { overflow-y: auto; padding: .1rem .75rem .1rem 0; }
.wiki-reader-content { overflow-y: auto; }
/* The guide column stays reachable but shows no scrollbar, so the right
   edge of the reader looks static while the article scrolls in the middle. */
.wiki-reader-context { overflow-x: hidden; overflow-y: auto; scrollbar-width: none; }
.wiki-reader-context::-webkit-scrollbar { display: none; }
@media (min-width: 1001px) {
  body:has(#course-view:not([hidden])) { overflow: hidden; }
  body:has(#course-view:not([hidden])) .wiki-shell { display: flex; flex-direction: column; height: calc(100vh - 5.25rem); height: calc(100dvh - 5.25rem); overflow: hidden; padding-bottom: 1rem; }
  body:has(#course-view:not([hidden])) #velowiki-app { display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0; }
  body:has(#course-view:not([hidden])) #course-view { display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0; }
  body:has(#course-view:not([hidden])) .wiki-reader-layout { flex: 1 1 auto; min-height: 0; overflow: hidden; }
}
@media (min-width: 1001px) {
  /* AI assistant open: the panel fills the guide column as a chat-style flex
     column — the TRANSCRIPT scrolls with a visible scrollbar and the composer
     (chips + ask + status) stays pinned at the bottom, Onyx-style. Without
     this the column's guide styling (overflow-y: auto + scrollbar-width:
     none) clips long answers with no visual affordance (2026-08-18 user
     report: "只展示出半边,没滚动条"). */
  .wiki-reader-context.ai-open { display: flex; flex-direction: column; }
  .wiki-reader-context.ai-open section.wiki-assistant-panel { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; }
  /* show-wiki mode: the AI body is hidden and the guide sections reappear
     below — the panel must keep its natural (head + tabs) height, or flex
     shrink crushes it to ~0 and the following sections paint OVER the tabs. */
  .wiki-reader-context.ai-open.show-wiki section.wiki-assistant-panel { flex: 0 0 auto; }
  .wiki-reader-context.ai-open .wiki-assistant-body { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; gap: .6rem; overflow: hidden; }
  .wiki-reader-context.ai-open .wiki-ai-turns { flex: 1 1 auto; }
}
.wiki-toc-module { padding: 0 0 1rem; border-bottom: 1px solid var(--line); }
.wiki-toc-module + .wiki-toc-module { padding-top: 1rem; }
.wiki-toc-module h2 { margin: 0 0 .45rem; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1rem; }
.wiki-toc-module ol { display: grid; gap: .12rem; margin: 0; padding: 0; list-style: none; }
.wiki-toc-module button { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .5rem; width: 100%; padding: .5rem .55rem; border: 0; border-left: 2px solid transparent; border-radius: 0 5px 5px 0; background: transparent; color: var(--muted); text-align: left; cursor: pointer; }
.wiki-toc-module button:hover { background: var(--teal-soft); color: var(--ink); }
.wiki-toc-module button[aria-current="true"] { border-left-color: var(--teal); background: var(--teal-soft); color: var(--ink); font-weight: 700; }
.wiki-toc-module small { color: inherit; font-size: .71rem; white-space: nowrap; }
.wiki-toc-module .wiki-lesson-number { display: block; margin-bottom: .08rem; color: var(--teal); font-size: .65rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }

.wiki-reader-content { min-width: 0; padding: clamp(1.25rem, 3vw, 2.5rem); border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.wiki-reader-content, .wiki-reader-content * { user-select: text; -webkit-user-select: text; }
.wiki-reader-content button { user-select: none; -webkit-user-select: none; }
.wiki-lecture-body pre { user-select: text; -webkit-user-select: text; }
.wiki-lecture-body code { user-select: text; -webkit-user-select: text; }
.wiki-reader-content ::selection { background: #efd4cd; color: var(--ink); }
.wiki-reader-content h2 { margin: .25rem 0 1rem; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: clamp(1.8rem, 3vw, 2.65rem); line-height: 1.18; }
.wiki-reader-content h3 { margin: 2rem 0 .65rem; color: var(--teal); font-size: 1rem; }
.wiki-reader-content h4 { margin: 1.15rem 0 .4rem; color: var(--ink); font-size: .95rem; }
.wiki-reader-content p, .wiki-reader-content li { line-height: 1.9; }
.wiki-reader-content ul, .wiki-reader-content ol { padding-left: 1.3rem; }
.wiki-lead { color: var(--muted); font-size: 1.05rem; }
.wiki-continuity { margin: 1rem 0 0; padding: .75rem .9rem; border-left: 3px solid var(--teal); background: var(--teal-soft); color: var(--ink); font-size: .91rem; line-height: 1.7; }
.wiki-lecture { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.wiki-lecture-label { display: flex; justify-content: space-between; gap: .75rem; align-items: baseline; padding-bottom: .7rem; color: var(--muted); font-size: .76rem; }
.wiki-lecture-label span { color: var(--teal); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.wiki-lecture-label small { overflow-wrap: anywhere; }
.wiki-lecture-hint { margin: 0 0 .8rem; color: var(--muted); font-size: .76rem; }
.wiki-lecture-hint::before { content: "※ "; color: var(--teal); }
.wiki-lecture-body h2 { margin: 1.8rem 0 .7rem; font-family: inherit; font-size: 1.35rem; }
.wiki-lecture-body h3 { margin: 1.7rem 0 .6rem; color: var(--ink); font-size: 1.18rem; font-weight: 700; }
.wiki-lecture-body h4 { margin: 1.2rem 0 .45rem; color: var(--teal); font-size: 1rem; font-weight: 700; }
.wiki-lecture-body hr { margin: 1.75rem 0; border: 0; border-top: 1px solid var(--line); }
.wiki-lecture-body blockquote { margin: 1rem 0; padding: .25rem 0 .25rem 1rem; border-left: 2px solid var(--teal); color: var(--muted); }
.wiki-extension { margin: 1.05rem 0; border: 1px solid #d4c7bf; border-radius: 6px; background: #fbfaf7; }
.wiki-extension summary { padding: .75rem .85rem; color: var(--teal); font-size: .9rem; font-weight: 800; cursor: pointer; }
.wiki-extension summary::marker { color: var(--teal); }
.wiki-extension-body { padding: 0 .9rem .85rem; border-top: 1px solid var(--line); }
.wiki-extension-body > :first-child { margin-top: .75rem; }
.wiki-inline-concept { min-height: 0; padding: 0 .1rem; border: 0; border-bottom: 1px dashed var(--teal); background: transparent; color: var(--teal); font-weight: 700; cursor: pointer; }
.wiki-inline-concept:hover { color: #852721; border-bottom-color: #852721; }
.wiki-lecture-body pre { overflow: auto; padding: .9rem; border: 1px solid var(--line); border-radius: 5px; background: #f7f6f3; color: var(--ink); font: .82rem/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.wiki-lecture-body :not(pre) > code { padding: .1rem .28rem; border-radius: 3px; background: #f0eee9; font: .84em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.wiki-lecture-body table { width: 100%; margin: 1rem 0; border-collapse: collapse; font-size: .86rem; }
.wiki-table-scroll { max-width: 100%; margin: 1rem 0; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.wiki-table-scroll table { margin: 0; }
.wiki-lecture-body th, .wiki-lecture-body td { padding: .55rem; border: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.55; }
.wiki-lecture-body th { background: #f7f6f3; color: var(--ink); }
.wiki-meta-row { display: flex; flex-wrap: wrap; gap: .4rem; }
.wiki-meta-row span { padding: .18rem .42rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .73rem; }
.wiki-meta-row .is-complete { border-color: #9fc4ae; background: #eff8f1; color: var(--green); }
.wiki-thought-questions { margin-top: 2.2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.wiki-thought-questions h3, .wiki-lecture-body .wiki-thought-questions h3 { margin-top: 0; color: var(--teal); font-size: 1rem; }
.wiki-thought-questions li + li { margin-top: .7rem; }
.wiki-thought-questions li::marker { color: var(--teal); font-weight: 700; }
.wiki-lab-panel { display: grid; gap: 1rem; margin-top: 2.2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.wiki-lab-panel-heading h3, .wiki-lab h3 { margin: .15rem 0 .45rem; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1.25rem; }
.wiki-lab-panel-heading > p:last-child, .wiki-lab header > p:last-child { margin: 0; color: var(--muted); line-height: 1.7; }
.wiki-lab { display: grid; gap: .85rem; padding: 1rem; border: 1px solid var(--line); border-radius: 6px; background: #fbfaf7; }
.wiki-lab .wiki-kicker { margin-bottom: .25rem; }
.wiki-lab-details { display: grid; gap: .55rem; padding: .8rem; border-left: 2px solid var(--teal); background: var(--teal-soft); }
.wiki-lab-details p { margin: 0; line-height: 1.65; }
.wiki-lab-boundary { margin: 0; padding: .7rem .8rem; border-left: 3px solid var(--orange); background: #fff6ee; color: #7d431b; line-height: 1.65; }
.wiki-lab-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.wiki-lab-field { display: grid; gap: .35rem; min-width: 0; color: var(--muted); font-size: .82rem; font-weight: 700; }
.wiki-lab-field small { font-weight: 500; }
.wiki-lab-field input { min-width: 0; min-height: 40px; padding: .55rem .65rem; border: 1px solid var(--line); border-radius: 5px; background: var(--panel); }
.wiki-lab-actions { display: flex; flex-wrap: wrap; gap: .65rem; grid-column: 1 / -1; }
.wiki-lab-result { display: grid; gap: .75rem; min-width: 0; }
.wiki-lab-empty, .wiki-lab-record { margin: 0; color: var(--muted); font-size: .84rem; line-height: 1.65; }
.wiki-lab-diagnostics { margin: 0; color: var(--ink); font-size: .88rem; line-height: 1.6; }
.wiki-lab-table { display: block; width: 100%; max-height: 22rem; overflow: auto; border-collapse: collapse; font-size: .82rem; }
.wiki-lab-table th, .wiki-lab-table td { padding: .5rem; border: 1px solid var(--line); text-align: right; white-space: nowrap; }
.wiki-lab-table th { position: sticky; top: 0; background: #f7f6f3; color: var(--ink); }
.wiki-lab-table th:first-child, .wiki-lab-table td:first-child { text-align: left; }
.wiki-lab-assumptions { margin: 0; padding-left: 1.25rem; color: var(--muted); font-size: .84rem; line-height: 1.65; }
.wiki-lab-warning { margin: 0; padding: .65rem .75rem; border: 1px solid #e0b38d; border-radius: 5px; background: #fff6ee; color: #7d431b; font-size: .84rem; line-height: 1.6; }
.wiki-lesson-navigation, .wiki-detail-actions, .wiki-ai-controls { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.5rem; }
.wiki-lesson-navigation { justify-content: space-between; margin-top: 2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.wiki-lesson-nav { display: grid; gap: .25rem; min-width: 0; max-width: 47%; padding: .7rem .9rem; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); text-align: left; cursor: pointer; }
.wiki-lesson-nav:hover { border-color: #caa8a1; background: var(--teal-soft); }
.wiki-lesson-nav.is-next { text-align: right; }
.wiki-lesson-nav.is-empty { flex: 1 1 0; border: 0; padding: 0; background: transparent; cursor: default; }
.wiki-lesson-nav-dir { color: var(--teal); font-size: .72rem; font-weight: 800; letter-spacing: .04em; }
.wiki-lesson-nav-title { color: var(--ink); font-size: .92rem; font-weight: 600; line-height: 1.5; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.wiki-lesson-toc { border-left: 2px solid var(--teal); padding-left: .8rem !important; }
.wiki-lesson-toc-list { display: grid; gap: .15rem; }
.wiki-toc-link { display: block; padding: .3rem .35rem; border-radius: 4px; color: var(--muted); font-size: .84rem; line-height: 1.5; }
.wiki-toc-link:hover { background: var(--teal-soft); color: var(--ink); }
.wiki-toc-link.is-sub { padding-left: 1.05rem; font-size: .8rem; }
.wiki-toc-link.is-active { background: var(--teal-soft); color: var(--ink); font-weight: 700; }
.wiki-action-button { min-height: 42px; padding: .55rem .8rem; border: 1px solid var(--teal); border-radius: 6px; background: var(--teal); color: white; font-weight: 700; cursor: pointer; }
.wiki-action-button:hover { background: #852721; }
.wiki-action-button.is-secondary { border-color: var(--line); background: var(--panel); color: var(--muted); }
.wiki-action-button.is-secondary:hover { background: #efede8; color: var(--ink); }
.wiki-action-button:disabled { opacity: .45; cursor: not-allowed; }

.wiki-reader-context { display: grid; gap: 1rem; padding: .1rem 0 .1rem .2rem; }
.wiki-reader-context section { padding: 0 0 1rem; border-bottom: 1px solid var(--line); }
.wiki-reader-context h2, .wiki-reader-context h3 { margin: 0 0 .55rem; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1rem; }
.wiki-reader-context p, .wiki-reader-context li { color: var(--muted); font-size: .86rem; line-height: 1.7; }
.wiki-guide { border-left: 2px solid var(--teal); padding-left: .8rem !important; }
.wiki-context-list { display: grid; gap: .55rem; }
.wiki-concept-link { display: grid; gap: .22rem; width: 100%; min-height: 0; padding: .55rem .6rem; border: 1px solid var(--line); border-radius: 5px; background: var(--panel); color: var(--text); text-align: left; cursor: pointer; }
.wiki-concept-link:hover { border-color: #caa8a1; background: var(--teal-soft); }
.wiki-concept-link strong { color: var(--teal); font-size: .86rem; }
.wiki-concept-link span { color: var(--muted); font-size: .8rem; line-height: 1.55; }
.wiki-reading-list { display: grid; gap: .7rem; margin: 0; padding-left: 1.1rem; }
.wiki-reading-list li { padding-left: .1rem; }
.wiki-reading-list a { color: var(--teal); font-size: .86rem; font-weight: 700; overflow-wrap: anywhere; }
.wiki-reading-list span { display: block; margin-top: .15rem; }
.wiki-concept-popover-overlay { position: fixed; z-index: 41; inset: 0; display: grid; place-items: center; padding: 1rem; background: rgba(23, 33, 30, .24); }
.wiki-concept-popover { display: grid; gap: .75rem; width: min(100%, 34rem); max-height: calc(100vh - 2rem); overflow: auto; padding: 1.1rem; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); box-shadow: var(--shadow); }
.wiki-concept-popover-heading { display: flex; justify-content: space-between; gap: 1rem; align-items: start; }
.wiki-concept-popover-heading .wiki-kicker { margin: 0; }
.wiki-concept-popover h2 { margin: 0; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1.35rem; }
.wiki-concept-popover p { margin: 0; color: var(--muted); line-height: 1.75; }
.wiki-concept-popover-why { padding: .75rem .85rem; border-left: 2px solid var(--teal); background: var(--teal-soft); color: var(--ink) !important; }
/* AI 助教：嵌在右侧概念栏里的双模式面板——正文宽度永不改变；
   窄屏（≤1000px）同一个 section 节点退化为底部抽屉覆盖。 */
.wiki-reader-context section.wiki-assistant-panel { display: grid; gap: .6rem; align-content: start; padding: .9rem .95rem 1rem; border: 1px solid var(--line); border-bottom: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.wiki-reader-context.ai-open > section:not(.wiki-assistant-panel) { display: none; }
.wiki-reader-context.ai-open.show-wiki .wiki-assistant-body { display: none; }
.wiki-reader-context.ai-open.show-wiki > section:not(.wiki-assistant-panel) { display: block; }
.wiki-assistant-head { display: flex; justify-content: space-between; align-items: center; gap: .6rem; }
.wiki-assistant-head h3 { margin: 0; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1.05rem; }
.wiki-ai-close { min-height: 32px; padding: .25rem .45rem; border: 0; background: transparent; color: var(--muted); cursor: pointer; }
.wiki-assistant-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: .2rem; padding: .2rem; border: 1px solid var(--line); border-radius: 7px; background: #f7f6f3; }
.wiki-assistant-tabs button { min-height: 32px; padding: .15rem .5rem; border: 0; border-radius: 5px; background: transparent; color: var(--muted); font-size: .8rem; font-weight: 700; cursor: pointer; }
.wiki-assistant-tabs button[aria-current="true"] { background: var(--panel); color: var(--teal); box-shadow: 0 1px 2px rgba(23, 33, 30, .08); }
.wiki-ai-quote { display: grid; gap: .3rem; padding: .55rem .7rem; border-left: 3px solid var(--teal); border-radius: 0 6px 6px 0; background: var(--teal-soft); }
.wiki-ai-quote-label { margin: 0; color: var(--teal); font-size: .68rem; font-weight: 800; letter-spacing: .06em; }
.wiki-ai-quote-text { margin: 0; color: var(--ink); font-size: .85rem; line-height: 1.65; overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.wiki-ai-quote.is-open .wiki-ai-quote-text { display: block; -webkit-line-clamp: unset; overflow: visible; }
.wiki-ai-quote-toggle { justify-self: start; min-height: 28px; padding: 0 .3rem; border: 0; background: transparent; color: var(--teal); font-size: .76rem; font-weight: 700; text-decoration: underline; cursor: pointer; }
/* Onyx-style chat transcript: scrolling turn list above a pinned composer. */
.wiki-ai-turns { min-height: 0; overflow-y: auto; scrollbar-width: thin; display: grid; gap: .85rem; align-content: start; padding-right: .15rem; }
.wiki-ai-turns::-webkit-scrollbar { width: 6px; }
.wiki-ai-turn.is-user { justify-self: end; max-width: 88%; padding: .5rem .8rem; border-radius: 12px 12px 3px 12px; background: var(--teal-soft); color: var(--ink); }
.wiki-ai-turn.is-user.is-quote { justify-self: stretch; max-width: none; padding: 0; border-radius: 0; background: transparent; }
.wiki-ai-turn-text { margin: 0; font-size: .86rem; font-weight: 650; line-height: 1.6; overflow-wrap: anywhere; }
.wiki-ai-turn.is-assistant { display: grid; gap: .55rem; min-width: 0; }
.wiki-ai-turn.is-assistant .wiki-ai-output { min-height: 2.5rem; }
.wiki-ai-composer { flex: none; display: grid; gap: .5rem; padding-top: .55rem; border-top: 1px solid var(--line); }
/* streaming caret: blinks while the live answer grows, gone when done */
.wiki-ai-output.is-streaming::after { content: "▍"; display: inline-block; margin-left: 2px; color: var(--teal); animation: wikiAiCaret 1s steps(2, start) infinite; }
@keyframes wikiAiCaret { to { visibility: hidden; } }
.wiki-ai-status-row { display: flex; align-items: baseline; gap: .6rem; }
.wiki-ai-status { flex: 1; min-height: 1.3rem; margin: 0; color: var(--muted); font-size: .8rem; }
.wiki-ai-status.is-error { color: var(--orange); }
.wiki-ai-stop { min-height: 28px; padding: 0 .2rem; border: 0; background: transparent; color: var(--muted); font-size: .78rem; font-weight: 700; text-decoration: underline; cursor: pointer; }
.wiki-ai-stop:hover { color: #852721; }
.wiki-ai-disclaimer { margin: 0; color: var(--soft); font-size: .72rem; line-height: 1.6; }
.wiki-ai-oneliner { margin: 0; padding: .6rem .8rem; border-left: 3px solid var(--teal); border-radius: 0 6px 6px 0; background: var(--teal-soft); color: var(--ink); font-weight: 650; line-height: 1.7; }
/* the finished card renders markdown (wrapped in <p>) + KaTeX inline math */
.wiki-ai-oneliner p { margin: 0; }
.wiki-ai-output { min-height: 2.5rem; padding: .7rem; border: 1px solid var(--line); border-radius: 5px; background: var(--panel); color: var(--text); white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.7; }
.wiki-ai-output.is-rendered { white-space: normal; }
.wiki-ai-output.is-rendered p { margin: 0 0 .6rem; }
.wiki-ai-output.is-rendered p:last-child { margin-bottom: 0; }
.wiki-ai-output.is-rendered ul, .wiki-ai-output.is-rendered ol { margin: 0 0 .6rem; padding-left: 1.2rem; }
.wiki-ai-output.is-rendered blockquote { margin: 0 0 .6rem; padding-left: .7rem; border-left: 3px solid var(--line); color: var(--muted); }
.wiki-ai-followups { display: flex; flex-wrap: wrap; gap: .4rem; }
.wiki-ai-chip { min-height: 32px; padding: .25rem .65rem; border: 1px solid var(--teal); border-radius: 999px; background: var(--panel); color: var(--teal); font-size: .78rem; font-weight: 700; cursor: pointer; }
.wiki-ai-chip:hover, .wiki-ai-chip:focus-visible { background: var(--teal-soft); }
.wiki-ai-restore { justify-self: start; min-height: 30px; padding: .15rem .4rem; border: 0; background: transparent; color: var(--muted); font-size: .78rem; text-decoration: underline; cursor: pointer; }
.wiki-assistant-ask { display: flex; gap: .45rem; }
.wiki-assistant-ask input { flex: 1; min-width: 0; min-height: 38px; padding: .45rem .65rem; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); font-size: .85rem; }
.wiki-ai-ask-send { flex: none; width: 38px; min-height: 38px; padding: 0; border: 0; border-radius: 6px; background: var(--teal); color: white; font-weight: 800; cursor: pointer; }
.wiki-ai-ask-send:hover { background: #852721; }
.wiki-ai-sources { margin: 0; padding-left: 1rem; }
.wiki-ai-sources a { color: var(--teal); overflow-wrap: anywhere; }
.wiki-ai-thinking { margin: 0; border: 1px dashed var(--line); border-radius: 5px; background: var(--panel); }
.wiki-ai-thinking summary { padding: .4rem .7rem; color: var(--muted); cursor: pointer; user-select: none; font-size: .85rem; }
.wiki-ai-thinking[open] summary { border-bottom: 1px dashed var(--line); }
.wiki-ai-thinking-body { max-height: 10rem; overflow: auto; padding: .5rem .7rem; color: var(--muted); font-size: .85rem; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere; }
.wiki-ai-expand { min-height: 32px; margin-left: auto; padding: .15rem .55rem; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--teal); font-size: .76rem; font-weight: 700; white-space: nowrap; cursor: pointer; }
.wiki-ai-expand:hover, .wiki-ai-expand:focus-visible { background: var(--teal-soft); color: var(--ink); }
/* 专注模式: ⤢ moves the assistant body into a centered overlay — the answer
   and its formulas read at full width; the lesson column never moves. */
.wiki-ai-focus-overlay { position: fixed; z-index: 40; inset: 0; display: grid; place-items: center; padding: clamp(.75rem, 3vh, 2rem); background: rgba(23, 33, 30, .34); }
/* max-height must use viewport units: a percentage here resolves against the
   content-sized grid track (cyclic → ignored), so long answers overflowed
   the viewport with no scrollbar anywhere (2026-08-18 user report). */
.wiki-ai-focus { display: flex; flex-direction: column; width: min(58rem, 100%); max-height: calc(100vh - 4rem); max-height: calc(100dvh - 4rem); border: 1px solid var(--line); border-radius: 10px; background: var(--panel); box-shadow: var(--shadow); }
.wiki-ai-focus-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: .85rem 1.35rem; border-bottom: 1px solid var(--line); }
.wiki-ai-focus-head h3 { margin: 0; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1.1rem; }
.wiki-ai-focus-close { min-height: 34px; padding: .2rem .75rem; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--muted); font-weight: 700; cursor: pointer; }
.wiki-ai-focus-close:hover, .wiki-ai-focus-close:focus-visible { color: var(--ink); background: #efede8; }
.wiki-ai-focus-body { flex: 1 1 auto; min-height: 0; display: flex; padding: 1.15rem 1.35rem 1.3rem; }
/* the relocated assistant body sheds the narrow-column constraints; the
   transcript keeps scrolling above the pinned composer */
.wiki-ai-focus-body .wiki-assistant-body { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: .8rem; }
.wiki-ai-focus-body .wiki-ai-turns { flex: 1 1 auto; }
.wiki-ai-focus-body .wiki-ai-output { font-size: 1rem; line-height: 1.85; }
.wiki-ai-focus-body .wiki-ai-output p { margin: 0 0 .75rem; }
.wiki-ai-focus-body .wiki-ai-oneliner { font-size: 1.02rem; }
.wiki-ai-focus-body .wiki-ai-thinking-body { max-height: 16rem; }
.wiki-ai-focus-body .wiki-ai-quote-text { font-size: .92rem; }
/* 选中句在正文里的锚定高亮（CSS Custom Highlight API，不支持则静默降级） */
::highlight(ai-anchor) { background: rgba(20, 143, 122, .18); }
/* 选中浮动工具条：四个教学化动作，轻量、瞬态。 */
.wiki-selection-action { position: fixed; z-index: 30; display: flex; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 9px; background: var(--panel); box-shadow: var(--shadow); }
.wiki-selection-action button { min-height: 30px; padding: .1rem .55rem; border: 0; border-radius: 6px; background: transparent; color: var(--teal); font-size: .8rem; font-weight: 700; white-space: nowrap; cursor: pointer; }
.wiki-selection-action button:hover, .wiki-selection-action button:focus-visible { background: var(--teal-soft); color: var(--ink); }
.wiki-selection-action button[data-mode="explain"] { background: var(--teal); color: white; }
.wiki-selection-action button[data-mode="explain"]:hover, .wiki-selection-action button[data-mode="explain"]:focus-visible { background: #852721; color: white; }
@media (max-width: 1000px) {
  .wiki-reader-context.ai-open > section:not(.wiki-assistant-panel) { display: block; }
  .wiki-reader-context section.wiki-assistant-panel { position: fixed; z-index: 40; left: 0; right: 0; bottom: 0; max-height: 68vh; overflow: auto; border: 0; border-top: 1px solid var(--line); border-radius: 12px 12px 0 0; box-shadow: var(--shadow); }
}

.wiki-view { padding-top: 1rem; }
.wiki-section-heading { display: flex; justify-content: space-between; gap: 1rem; align-items: end; margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
.wiki-section-heading h2 { font-size: clamp(1.65rem, 3vw, 2.3rem); }
.wiki-section-heading p { color: var(--muted); }
.wiki-reference-layout { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(0, 1.8fr); gap: 1rem; }
.wiki-list { display: grid; align-content: start; gap: .4rem; max-height: 70vh; overflow: auto; }
.wiki-list-item, .wiki-detail { border: 1px solid var(--line); border-radius: 6px; background: var(--panel); }
.wiki-list-item { display: grid; gap: .3rem; padding: .75rem; color: var(--text); text-align: left; cursor: pointer; }
.wiki-list-item:hover, .wiki-list-item[aria-current="true"] { border-color: #caa8a1; background: var(--teal-soft); }
.wiki-list-item small, .wiki-detail p { color: var(--muted); line-height: 1.65; }
.wiki-detail { min-height: 20rem; padding: 1.2rem; }
.wiki-detail h3 { margin-top: 0; color: var(--ink); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1.45rem; }
.wiki-detail textarea { min-height: 16rem; resize: vertical; }
.wiki-concept-detail { margin: 1rem 0; padding: .8rem 1rem; border-left: 3px solid var(--teal); background: var(--teal-soft); border-radius: 0 5px 5px 0; font-size: .89rem; line-height: 1.72; color: var(--ink); }
.wiki-concept-detail p { margin: .45rem 0; }
.wiki-concept-detail p:first-child { margin-top: 0; }
.wiki-concept-detail p:last-child { margin-bottom: 0; }
.wiki-concept-detail strong { color: var(--ink); }
.wiki-lecture-body .katex-display, .wiki-concept-detail .katex-display { margin: .5rem 0 !important; overflow-x: auto; overflow-y: hidden; }
.wiki-concept-detail .katex { font-size: .95em; }
.wiki-empty, .wiki-noscript { padding: 1rem; border: 1px dashed var(--line); color: var(--muted); }
.wiki-footer { display: flex; justify-content: space-between; gap: 1rem; padding: 1.2rem clamp(1rem, 3vw, 3rem); border-top: 1px solid var(--line); color: var(--soft); font-size: .78rem; }

/* Course library (courses.html): a paged shelf with four visible courses on desktop. */
.wiki-course-carousel { display: grid; gap: .85rem; }
.wiki-course-carousel-bar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; min-height: 2.5rem; padding-top: .15rem; border-top: 1px solid var(--line); }
.wiki-course-page-status { margin: 0; color: var(--muted); font-size: .8rem; font-weight: 700; letter-spacing: .02em; }
.wiki-course-page-controls { display: flex; gap: .5rem; }
.wiki-course-page-button { display: inline-flex; align-items: center; justify-content: center; gap: .42rem; min-height: 38px; padding: .42rem .72rem; border: 1px solid var(--line); border-radius: 999px; background: var(--panel); color: var(--teal); font: inherit; font-size: .8rem; font-weight: 750; cursor: pointer; transition: border-color 160ms ease, background 160ms ease, color 160ms ease; }
.wiki-course-page-button:hover:not(:disabled), .wiki-course-page-button:focus-visible { border-color: var(--teal); background: var(--teal-soft); outline: none; }
.wiki-course-page-button:disabled { color: var(--soft); cursor: not-allowed; opacity: .62; }
.wiki-course-viewport { overflow: hidden; border-radius: 8px; touch-action: pan-y; }
.wiki-course-viewport:focus-visible { outline: 2px solid var(--teal); outline-offset: 4px; }
.wiki-course-list { display: flex; align-items: stretch; width: 100%; transition: transform 320ms cubic-bezier(.22, .61, .36, 1); will-change: transform; }
.wiki-course-page { display: grid; flex: 0 0 100%; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; min-width: 0; }
.wiki-course-page.is-partial { align-content: start; grid-auto-rows: max-content; }
.wiki-course-page[aria-hidden="true"] { pointer-events: none; }
.wiki-course-card { display: grid; grid-template-rows: auto auto auto 1fr auto; gap: .5rem; padding: 1.1rem 1.2rem; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--text); transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease; }
.wiki-course-card:hover, .wiki-course-card:focus-visible { border-color: #caa8a1; box-shadow: var(--shadow); transform: translateY(-2px); outline: none; }
.wiki-course-tag { justify-self: start; padding: .2rem .55rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .72rem; font-weight: 700; }
.wiki-course-card strong { color: var(--teal); font-family: Georgia, "Source Han Serif SC", serif; font-size: 1.18rem; line-height: 1.35; }
.wiki-course-subtitle { color: var(--ink); font-size: .9rem; font-weight: 600; line-height: 1.6; }
.wiki-course-summary { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; color: var(--muted); font-size: .84rem; line-height: 1.7; }
.wiki-course-foot { display: flex; justify-content: space-between; gap: 1rem; align-items: end; margin-top: .35rem; }
.wiki-course-progress { color: var(--soft); font-size: .75rem; }
.wiki-course-open { color: var(--teal); font-size: .9rem; font-weight: 700; }
.wiki-course-badge { display: inline-block; margin-left: .5rem; padding: .12rem .5rem; border: 1px solid var(--teal); border-radius: 999px; background: var(--teal-soft); color: var(--teal); font-size: .68rem; font-weight: 700; vertical-align: .22em; white-space: nowrap; }
.wiki-test-banner { margin-bottom: 1.1rem; padding: .6rem .95rem; border: 1px solid var(--teal); border-radius: 6px; background: var(--teal-soft); color: var(--teal); font-size: .84rem; line-height: 1.7; }
.wiki-test-banner strong { font-weight: 800; }
[hidden] { display: none !important; }

@media (max-width: 1000px) {
  .wiki-course-page { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wiki-reader-layout { grid-template-columns: minmax(170px, .6fr) minmax(0, 1.7fr); }
  .wiki-reader-context { position: static; grid-column: 1 / -1; max-height: none; grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .wiki-topbar { grid-template-columns: 1fr auto; }
  .wiki-primary-nav { grid-column: 1 / -1; justify-content: start; overflow-x: auto; padding-bottom: .1rem; }
  .wiki-shell { width: min(100% - 1.25rem, 1360px); padding-top: 1rem; }
  .wiki-course-header, .wiki-reader-layout, .wiki-reference-layout, .wiki-reader-context { display: grid; grid-template-columns: 1fr; }
  .wiki-course-header { gap: 1rem; }
  .wiki-course-header h1 { font-size: 2rem; }
  .wiki-reader-nav, .wiki-reader-context { position: static; max-height: none; }
  .wiki-reader-nav { order: 0; max-height: 18rem; }
  .wiki-reader-content { order: 1; padding: 1.15rem; }
  .wiki-reader-context { order: 2; }
  .wiki-lesson-navigation { flex-direction: column; }
  .wiki-lesson-nav { max-width: 100%; }
  .wiki-lesson-nav.is-empty { display: none; }
  .wiki-lab-fields { grid-template-columns: 1fr; }
  .wiki-lab-actions .wiki-action-button { width: 100%; }
  .wiki-section-heading, .wiki-footer { align-items: stretch; flex-direction: column; }
  .wiki-search-field { width: 100%; }
  .wiki-course-carousel-bar { align-items: stretch; flex-direction: column; }
  .wiki-course-page-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wiki-course-page-button { width: 100%; }
  .wiki-course-page { grid-template-columns: 1fr; }
  .wiki-course-foot { align-items: start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; } }