/* The main navigation uses the same gutter as the rest of the site. Chapters
   and their local outline occupy separate grid tracks in the remaining space. */
html.has-shared-theme, html.has-shared-theme body.folio-lecture {
  overflow-x: clip;
  overflow-y: visible;
}
html.has-shared-theme { scroll-padding-top: 76px; }
html.has-shared-theme body.folio-lecture {
  --sheet: var(--cr-card-bg);
  --paper-strong: var(--cr-card-bg);
  --line-strong: var(--cr-border-strong);
  --green: var(--folio-teal);
  --teal: var(--folio-teal);
  --green-soft: color-mix(in srgb, var(--folio-teal) 8%, var(--cr-page-bg));
  --vermilion: var(--cr-accent-strong);
  --vermilion-soft: color-mix(in srgb, var(--red, #a65b63) 8%, var(--cr-card-bg));
  --gold: var(--cr-accent-strong);
  --lab: var(--cr-panel-bg);
  --lab-panel: var(--cr-card-bg);
  --lab-line: var(--cr-border-strong);
  --lab-text: var(--global-text-color);
  --lab-muted: var(--cr-ink-soft);
  --visual-bg: var(--cr-panel-bg);
  --node-fill: var(--cr-card-bg);
  --subtle-bg: var(--cr-surface);
  --subtle-bg-strong: var(--cr-card-bg);
  --table-head-bg: var(--cr-panel-bg);
  --chip-bg: var(--cr-card-bg);
  --reader-gutter: clamp(24px, 3.25vw, 60px);
  --reader-top: clamp(29px, 3.2vw, 55px);
  background: var(--cr-page-bg);
  color: var(--global-text-color);
  font: 400 16px/1.7 var(--cr-font-sans);
}
.folio-lecture .folio-bar { position: sticky; z-index: 25; top: 0; }
.folio-lecture .reading-progress { top: 0; left: var(--folio-rail-width); right: 0; height: 2px; background: transparent; pointer-events: none; }
.folio-lecture .reading-progress span { background: var(--cr-accent); }
.folio-lecture .folio-crumb { flex-wrap: nowrap; min-width: 0; white-space: nowrap; }
.folio-lecture .folio-crumb strong { overflow: hidden; text-overflow: ellipsis; }
.folio-lecture .folio-tools { flex-shrink: 0; }
.folio-lecture-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  max-width: 1360px;
  margin: 0 auto;
  padding: var(--reader-top) var(--reader-gutter) 64px;
}
.folio-lecture .folio-lecture-layout > main.lecture {
  grid-area: 1 / 1;
  container-type: inline-size;
  min-width: 0;
  width: 100%;
  max-width: 930px;
  margin: 0 auto;
  padding: 0;
  overflow: visible;
  background: none;
}
.folio-lecture .lecture-toc {
  display: none;
  box-sizing: border-box;
  height: auto;
  margin: 0;
  padding: 0 0 0 18px;
  border: 0;
  border-left: 1px solid var(--cr-border);
  border-radius: 0;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  background: var(--cr-page-bg);
  color: var(--cr-ink-soft);
  box-shadow: none;
  transform: none;
}
.folio-lecture .lecture-toc > p, .folio-lecture .toc-heading {
  margin: 0 0 10px;
  padding: 0 7px 9px;
  color: var(--global-text-color);
  border: 0;
  border-bottom: 1px solid var(--cr-border);
  font: 600 12px/1.5 var(--cr-font-sans);
  letter-spacing: .025em;
}
.folio-lecture .toc-heading span { font: inherit; }
.folio-lecture .toc-heading small { color: var(--cr-accent-strong); font: 11px/1.5 var(--cr-font-mono); }
.folio-lecture .lecture-toc nav { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2px; margin: 0; }
.folio-lecture .lecture-toc nav a {
  min-width: 0;
  padding: 5px 8px;
  border: 0;
  border-radius: 3px;
  background: none;
  color: var(--cr-ink-soft);
  font: 500 13px/1.5 var(--cr-font-sans);
  overflow-wrap: anywhere;
  text-decoration: none;
}
.folio-lecture .lecture-toc nav a:is(.active, [aria-current], :hover, :focus-visible) {
  background: var(--cr-accent-soft);
  color: var(--cr-accent-strong);
  box-shadow: inset 2px 0 var(--cr-accent);
}
.folio-lecture .folio-bar .toc-toggle {
  display: inline-flex;
  align-items: center;
  position: static;
  width: auto;
  height: auto;
  min-height: 34px;
  margin: 0;
  padding: 4px 8px;
  border: 1px solid var(--cr-border);
  border-radius: 4px;
  color: var(--cr-accent-strong);
  background: var(--cr-surface);
  box-shadow: none;
  font: 550 12px/1.4 var(--cr-font-sans);
}
@media (min-width: 72rem) {
  .folio-lecture-layout { grid-template-columns: minmax(0, 1fr) clamp(173px, 13.2vw, 215px); gap: clamp(26px, 2.5vw, 44px); }
  .folio-lecture .lecture-toc, .folio-lecture .lecture-toc.open {
    display: block;
    grid-area: 1 / 2;
    position: sticky;
    inset: 86px auto auto;
    z-index: 1;
    width: 100%;
    max-width: none;
    max-height: calc(100dvh - 106px);
  }
  .folio-lecture .folio-bar .toc-toggle { display: none; }
}
@media (max-width: 71.99rem) {
  .folio-lecture .lecture-toc.open {
    display: block;
    position: fixed;
    inset: 69px var(--reader-gutter) auto auto;
    z-index: 32;
    width: min(290px, calc(100% - 32px));
    max-height: calc(100dvh - 88px);
    padding: 14px;
    border: 1px solid var(--cr-border-strong);
    border-radius: 6px;
    background: var(--cr-card-bg);
    box-shadow: 0 8px 24px rgb(26 45 81 / .14);
    transform: none;
  }
}
@media (max-width: 63.99rem) {
  .folio-lecture .reading-progress { left: 0; }
  .folio-lecture .lecture-toc.open { top: 61px; }
}
@media (max-width: 650px) {
  html.has-shared-theme body.folio-lecture { --reader-gutter: 18px; --reader-top: 26px; }
  .folio-lecture .folio-bar__inner { gap: 8px; padding-inline: 16px; }
  .folio-lecture .folio-crumb > strong, .folio-lecture .folio-crumb > span:last-of-type { display: none; }
  .folio-lecture .folio-crumb > a:first-of-type, .folio-lecture .folio-crumb > a:first-of-type + span { display: none; }
}

.folio-lecture .lecture :is(.paper-header, .chapter) {
  border: 0;
  border-bottom: 1px solid var(--cr-border);
  border-radius: 0;
  background: none;
  box-shadow: none;
}
.folio-lecture .lecture .paper-header { margin: 0; padding: 0 0 clamp(23px, 2.8vw, 40px); }
.folio-lecture .paper-header .kicker, .folio-lecture .chapter-number, .folio-lecture .lab-index {
  margin: 0 0 8px;
  color: var(--cr-accent-strong);
  font: 600 11px/1.6 var(--cr-font-mono);
  letter-spacing: .075em;
}
.folio-lecture .lecture .paper-header h1 {
  max-width: none;
  margin: 0 0 12px;
  color: var(--global-text-color);
  font: 600 clamp(29px, 4.9cqi, 46px)/1.24 var(--cr-font-serif);
  letter-spacing: -.025em;
  text-wrap: balance;
}
.folio-lecture .paper-header .subtitle { max-width: 68ch; margin: 0; color: var(--cr-ink-soft); font: 400 clamp(15px, 1.9cqi, 18px)/1.75 var(--cr-font-sans); }
.folio-lecture .paper-header .route { margin: 18px 0; }
.folio-lecture .paper-header .lecture-contract { padding-top: 13px; }
.folio-lecture .lecture .chapter { margin: 0; padding: clamp(28px, 4.6cqi, 45px) 0; }
.folio-lecture .lecture .chapter h2 {
  max-width: none;
  margin: 0 0 9px;
  color: var(--global-text-color);
  font: 600 clamp(23px, 3.8cqi, 34px)/1.32 var(--cr-font-serif);
  letter-spacing: -.02em;
}
.folio-lecture .lecture .chapter-header { margin: 0 0 21px; }
.folio-lecture .chapter h3 { font-family: var(--cr-font-serif); color: var(--global-text-color); }
.folio-lecture .chapter-summary { max-width: 70ch; color: var(--cr-ink-soft); }
.folio-lecture .lecture :is(.mechanism-card, .shape-card, .example-card, .algorithm-panel, .method-block,
  .case-panel, .diagram-card, .source-note, .evidence-card, .problem-card, .answer-note, .sample-card,
  .prereq-card, .judgement-card, .step-derivation, .misconception-card, .chapter-checkpoints, .checklist-panel) {
  border-color: var(--cr-border);
  border-radius: 4px;
  background: var(--cr-card-bg);
  box-shadow: none;
}
.folio-lecture .lecture :is(.question-block, .scope-note, .walkthrough, .deep-note, .derivation-section, .cache-formula) {
  border-left: 3px solid var(--cr-accent);
  background: var(--cr-surface);
}
.folio-lecture .lecture .orientation { margin: 24px 0 0; padding: 18px; background: var(--cr-panel-bg); border-color: var(--cr-border); }
.folio-lecture .lecture .orientation h2 { margin-bottom: 12px; font: 600 20px/1.45 var(--cr-font-serif); }
.folio-lecture .chapter-route li { border-color: var(--cr-border); background: var(--cr-card-bg); }
.folio-lecture .chapter .interactive-lab, .folio-lecture .chapter .lab-panel {
  border: 1px solid var(--cr-border);
  border-radius: 5px;
  background: var(--cr-panel-bg);
  color: var(--global-text-color);
  box-shadow: none;
}
.folio-lecture .lecture :is(.lab-visual, .lab-controls, .lab-heading) { border-color: var(--cr-border); }
.folio-lecture .lecture .interactive-lab :is(select, textarea, button) { border-radius: 3px; }
.folio-lecture .lecture .interactive-lab[data-lab] button:not(.secondary):not(.lab-reset),
.folio-lecture .lecture .interactive-lab[data-lab] .segmented button.active { background: var(--cr-accent-strong); border-color: var(--cr-accent-strong); color: var(--cr-card-bg); }
.folio-lecture .lecture .interactive-lab[data-lab] .segmented button:not(.active) { background: var(--cr-card-bg); border-color: var(--cr-border-strong); color: var(--cr-ink-soft); }
.folio-lecture .lecture :is(.table-wrap, .table-scroll, .summary-matrix, .equation, .formula-stack, pre, mjx-container[display="true"]) { max-width: 100%; overflow-x: auto; }
.folio-lecture .lecture :is(.section-mount, .answer-list) { grid-template-columns: minmax(0, 1fr); }
.folio-lecture .lecture .concept-ladder { grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr)); }
.folio-lecture .lecture :is(p, li) mjx-container:not([display="true"]) {
  display: inline-block;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding-block: .12em;
  vertical-align: middle;
}
.folio-lecture .lecture :is(img, svg, canvas) { max-width: 100%; }
.folio-lecture .lecture table th { background: var(--cr-panel-bg); color: var(--global-text-color); }
.folio-lecture .lecture .example-card pre, .folio-lecture .lecture .code-block pre { background: #192538; color: #e3ebfa; }
.folio-lecture .lecture #ropeCanvas { background: #172335; }
.folio-lecture .page-footer { width: auto; max-width: 1360px; margin: 0 auto; padding: 18px var(--reader-gutter); border-top: 1px solid var(--cr-border); background: var(--cr-surface); }
@container (max-width: 690px) {
  .folio-lecture .lecture :is(.mechanism-grid, .examples-grid, .failure-grid, .lab-layout, .phase-comparison) { grid-template-columns: minmax(0, 1fr); }
  .folio-lecture .phase-arrow { transform: rotate(90deg); }
  .folio-lecture .chapter-route { grid-template-columns: repeat(auto-fit, minmax(min(100%, 145px), 1fr)); }
  .folio-lecture .chapter-route li { display: block; }
  .folio-lecture .thesis-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media print {
  .folio-lecture .lecture-toc, .folio-lecture .reading-progress { display: none; }
  .folio-lecture-layout { display: block; max-width: none; padding: 0; }
}