/* 集合知识笔记：沿用培玉配色，目录与一页数学笔记。 */
.knowledge-page .wrap { max-width: 1240px; }
.knowledge-page [hidden], .k-point [hidden] { display: none !important; }
.k-skip { position: absolute; left: 12px; top: -100px; padding: 10px; background: var(--card); z-index: 20; }
.k-skip:focus { top: 8px; }
.k-theme, .k-text-button { font: inherit; font-size: 14px; color: var(--a); background: transparent; border: 0; cursor: pointer; padding: 7px; min-height: 42px; }
.k-page-intro { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin: 20px 0 26px; }
.k-page-intro h1 { font-size: 28px; }
.k-page-intro > p { margin: 0 0 3px; color: var(--muted); }
.k-coverage { margin: -12px 0 22px; color: var(--muted); font-size: 14px; }
.k-layout { display: grid; grid-template-columns: 278px minmax(0, 1fr); gap: 38px; align-items: start; }
.k-sidebar { position: sticky; top: 18px; max-height: calc(100vh - 36px); overflow: auto; padding: 0 5px 14px 0; }
.k-filters { padding: 0 0 16px; border-bottom: 1px solid var(--line); }
.k-field { display: block; font-size: 14px; font-weight: 600; margin: 0 0 6px; }
.k-field:not(:first-child) { margin-top: 14px; }
.k-filter-grid { display: grid; gap: 12px; margin-top: 14px; }
.k-filter-grid > div { min-width: 0; }
.k-filter-grid .k-field { margin: 0 0 6px; }
.k-search-row { display: flex; gap: 3px; }
.k-search-row input, .k-filters select { width: 100%; min-width: 0; color: var(--fg); background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 9px 10px; font: inherit; font-size: 15px; min-height: 44px; }
.k-check { display: flex; gap: 9px; align-items: center; margin-top: 13px; min-height: 34px; font-size: 14px; cursor: pointer; }
.k-check input, .k-option input { accent-color: var(--a); }
.k-check input { width: 18px; height: 18px; }
.k-directory { margin-top: 16px; }
.k-directory > summary { font-weight: 700; cursor: pointer; padding: 5px 0; }
#knowledge-count { font-size: 14px; color: var(--muted); font-weight: 400; margin-left: 5px; }
.k-list-hint { font-size: 14px; color: var(--muted); margin: 4px 0 10px; }
.k-list-group { margin: 15px 0 5px; font-size: 14px; color: var(--muted); font-weight: 500; }
.k-nav-link { display: flex; align-items: baseline; gap: 7px; padding: 9px 9px 9px 12px; margin: 2px 0; border-left: 3px solid transparent; border-radius: 0 6px 6px 0; text-decoration: none; color: var(--fg); line-height: 1.5; min-height: 44px; font-size: 14px; }
.k-nav-link:hover { background: var(--card); }
.k-nav-link[aria-current="true"] { border-color: var(--a); background: var(--ok-soft); font-weight: 600; }
.k-nav-name { flex: 1; min-width: 0; }
.k-nav-state { font-size: 14px; color: var(--muted); white-space: nowrap; font-weight: 400; }
.k-nav-state.passed { color: var(--a); }
.k-nav-state.review { color: var(--no); }
.k-sidebar-note { font-size: 14px; color: var(--muted); padding-top: 14px; border-top: 1px solid var(--line); }
#knowledge-detail { min-width: 0; scroll-margin-top: 18px; }
.k-point { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 32px 30px; min-width: 0; }
.k-point-head { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; font-size: 14px; color: var(--muted); }
.k-point-title { margin: 8px 0 15px; font-size: 27px; line-height: 1.4; }
.k-scope, .k-point-status { border: 1px solid var(--line); padding: 1px 7px; border-radius: 5px; }
.k-scope.enrichment { border-color: var(--b); color: var(--b); }
.k-point-status.passed { color: var(--a); }
.k-point-status.review { color: var(--no); }
.k-definition { font-size: 17px; line-height: 1.9; margin: 0 0 20px; overflow-wrap: anywhere; }
.k-point h3 { margin: 23px 0 8px; font-size: 17px; }
.k-point ul, .k-point ol { padding-left: 22px; margin: 8px 0 12px; }
.k-point li + li { margin-top: 6px; }
.k-point p { overflow-wrap: anywhere; }
.k-conditions { border-left: 3px solid var(--a); padding-left: 16px; }
.k-conditions h3 { margin-top: 0; }
.k-misconception { border-top: 1px solid var(--line); padding-top: 12px; margin-top: 12px; }
.k-misconception p { margin: 3px 0 7px; }
.k-error { color: var(--no); }
.k-correction b { color: var(--a); }
.k-note { font-size: 14px; color: var(--muted); }
.k-optional { border-left: 3px solid var(--b); padding: 8px 12px; background: var(--hl-soft); font-size: 14px; }
.k-more { border-top: 1px solid var(--line); padding: 12px 0 0; margin: 17px 0; }
.k-more > summary { color: var(--muted); cursor: pointer; font-size: 14px; min-height: 32px; }
.k-quiz { margin-top: 27px; padding-top: 21px; border-top: 2px solid var(--a); }
.k-quiz fieldset { min-width: 0; padding: 0; border: 0; margin: 0; }
.k-quiz legend { font-size: 19px; font-weight: 700; padding: 0; }
.k-quiz-prompt { margin: 10px 0 14px; }
.k-options { display: grid; gap: 8px; }
.k-option { display: flex; align-items: baseline; gap: 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; min-width: 0; min-height: 48px; }
.k-option input { flex: 0 0 auto; margin: 5px 0 0; width: 17px; height: 17px; }
.k-option > span { min-width: 0; overflow-wrap: anywhere; }
.k-option:has(input:checked) { border-color: var(--a); background: var(--ok-soft); }
.k-option.correct { border-color: var(--a); background: var(--ok-soft); }
.k-option.incorrect, .k-option.incorrect:has(input:checked) { border-color: var(--no); background: var(--no-soft); }
.k-option:has(input:disabled) { cursor: default; }
.k-option input:disabled { opacity: 1; }
.k-quiz-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 15px 0 4px; }
.k-quiz-feedback { margin-top: 15px; border-left: 3px solid var(--a); padding: 4px 0 4px 14px; }
.k-quiz-feedback.review { border-color: var(--no); }
.k-quiz-feedback p { margin: 2px 0 9px; }
.k-storage { font-size: 14px; color: var(--b); margin: 9px 0; }
.k-links { display: flex; gap: 7px; flex-wrap: wrap; }
.k-links a { padding: 6px 9px; border: 1px solid var(--line); border-radius: 6px; font-size: 14px; text-decoration: none; min-height: 38px; }
.k-links a:hover { border-color: var(--a); }
.k-relation-label { font-size: 14px; color: var(--muted); margin: 14px 0 5px; }
.k-lesson-links { display: flex; gap: 9px; flex-wrap: wrap; padding-top: 22px; margin-top: 23px; border-top: 1px solid var(--line); }
.k-complement { margin: 20px 0; padding: 16px 18px; background: var(--bg); border-radius: 9px; }
.k-complement h3 { margin: 0 0 11px; }
.k-set-play { display: flex; gap: 12px; align-items: stretch; }
.k-universe { flex: 1; min-width: 0; border: 1px solid var(--a); border-radius: 8px; padding: 10px; }
.k-universe-label { font-size: 14px; color: var(--a); margin-bottom: 8px; }
.k-set-interior { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; }
.k-set-a { border: 1px solid var(--b); border-radius: 40px; padding: 9px 12px; display: flex; align-items: center; gap: 7px; }
.k-set-a > span { font-size: 14px; color: var(--b); }
.k-set-token { width: 44px; height: 44px; padding: 0; flex: 0 0 auto; border: 1px solid var(--line); border-radius: 50%; background: var(--card); color: var(--fg); font: inherit; cursor: pointer; }
.k-set-token[aria-pressed="true"] { outline: 3px solid var(--hl); outline-offset: 2px; }
.k-set-outside { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; font-size: 14px; color: var(--muted); }
.k-set-answer { min-height: 3.5em; margin: 10px 0 0; font-size: 14px; }
.k-empty { padding: 12px 0; color: var(--muted); font-size: 14px; }
.knowledge-page :focus-visible, .k-point :focus-visible { outline: 3px solid var(--hl); outline-offset: 3px; }
.k-point .katex { font-size: 1.05em; }
/* A long inline formula must scroll within the note, never widen the viewport. */
/* The padding holds the sqrt SVG's extra 2px, so short formulas get no stray scrollbar and tall ones are not clipped. */
.k-point :not(.katex-display) > .katex { display: inline-block; max-width: 100%; overflow-x: auto; overflow-y: hidden; padding: .12em 3px .12em 0; vertical-align: middle; }
.k-point .katex-display { max-width: 100%; overflow-x: auto; overflow-y: hidden; }
@media (max-width: 760px) {
  .k-layout { display: block; }
  .k-sidebar { position: static; max-height: none; overflow: visible; padding: 0; margin-bottom: 18px; }
  .k-page-intro { display: block; margin: 16px 0 20px; }
  .k-page-intro > p { margin-top: 7px; font-size: 14px; }
  .k-filters { border: 0; padding: 0; }
  .k-filter-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; }
  .k-directory { border: 1px solid var(--line); border-radius: 8px; padding: 6px 11px; margin-top: 10px; }
  .k-directory > summary { min-height: 38px; padding: 6px 0; }
  #knowledge-list { max-height: 340px; overflow: auto; }
  .k-sidebar-note { display: none; }
  .k-point { padding: 20px 17px 24px; }
  .k-point-title { font-size: 25px; }
  .k-definition { font-size: 16px; }
  .k-complement { padding: 13px 11px; }
  .k-set-play { gap: 7px; }
  .k-set-a { padding: 7px 8px; gap: 4px; }
  .k-set-token { width: 44px; height: 44px; }
  .knowledge-page .top { gap: 5px; }
  .knowledge-page .top .brand { font-size: 14px; }
  .knowledge-page .top a.rec { font-size: 14px; padding: 5px 8px; }
  .k-theme { font-size: 14px; padding: 5px; }
}
@media (prefers-reduced-motion: reduce) { .knowledge-page *, .k-point * { scroll-behavior: auto !important; } }

/* Junior knowledge uses the shared site palette in both themes. */
.knowledge-junior :is(.k-theme, .k-text-button, .k-coverage, .k-field, .k-check, .k-list-hint, .k-list-group, .k-nav-link, .k-nav-state, .k-sidebar-note, .k-point-head, .k-note, .k-optional, .k-more > summary, .k-storage, .k-links a, .k-relation-label, .k-empty, .kc-point small) { font-size: 15px; }
.knowledge-junior #knowledge-count { font-size: 15px; }
.knowledge-junior .k-page-intro > p { font-size: 15px; }
.knowledge-junior .k-nav-link { flex-wrap: wrap; overflow-wrap: anywhere; }
.knowledge-junior .k-nav-state { white-space: normal; }
.k-junior-book, .k-junior-chapter, .k-junior-optional { min-width: 0; margin: 10px 0; }
.k-junior-book > summary, .k-junior-chapter > summary, .k-junior-optional > summary { cursor: pointer; min-height: 44px; padding: 9px 0; overflow-wrap: anywhere; }
.k-junior-book > summary { font-weight: 700; color: var(--a); }
.k-junior-chapter { padding-left: 8px; border-left: 1px solid var(--line); }
.k-junior-chapter > summary { font-weight: 600; }
.k-junior-section { min-width: 0; }
.k-junior-optional > summary { color: var(--muted); font-size: 15px; }
.knowledge-junior.knowledge-page .top .brand, .knowledge-junior.knowledge-page .crumb { font-size: 15px; }