/* Course catalogue and scientific workspaces inherit Algorythme's theme. */
.worked-path > p { max-width: 65ch; }
.worked-path .math-recall { padding-block: 12px; border-block: 1px solid var(--line); }
.solution-steps { padding-left: 28px; margin-block: 24px; }
.solution-steps > li { padding: 0 0 28px 8px; margin-bottom: 24px; border-bottom: 1px solid var(--line); }
.solution-steps h4 { margin: 0 0 12px; font: 600 18px/1.4 var(--font-data, sans-serif); }
.solution-step > summary { cursor: pointer; min-height: 44px; }
.solution-step > summary:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
.solution-step .step-title { font: 600 18px/1.4 var(--font-data, sans-serif); }
.solution-step .equation-scroll { display: block; }
.solution-steps p { max-width: 65ch; margin-bottom: 0; }
.equation-scroll { max-width: 100%; overflow-x: auto; overflow-y: hidden; padding: 16px 8px; margin-block: 12px; background: var(--panel); }
.equation-scroll math { font-family: "Cambria Math", "STIX Two Math", math; font-size: 24px; color: var(--ink); width: max-content; min-width: 100%; }
.theory-reference { margin-block: 24px; }
.theory-reference > summary { min-height: 44px; cursor: pointer; padding: 10px 0; }
.ode-values { font-variant-numeric: tabular-nums; }
.science-drawing .numerical { stroke: var(--ok); stroke-width: 2; stroke-dasharray: 5 3; fill: none; }
.science-drawing .ode-exact { stroke: var(--ink); stroke-width: 2; fill: none; }
.science-drawing .slope { stroke: var(--line); stroke-width: 1; }
.science-drawing.electric-drawing .electric-outline { fill: var(--bg); stroke: var(--ink); stroke-width: 2; }
.electric-drawing .electric-dot { fill: var(--ink); }
.electric-drawing .electric-field { stroke: var(--line); stroke-width: 1.2; }
.electric-drawing .electric-dashed { stroke-dasharray: 5 4; }
.electric-drawing .electric-trace { fill: none; stroke: var(--ink); stroke-width: 2; }
.electric-drawing .electric-tick { text-anchor: middle; }
.electric-drawing .electric-y-tick { text-anchor: end; }
.science-drawing.electric-drawing text { font-size: 18px; }
.science-drawing.physics-drawing .physics-outline { fill: none; stroke: var(--ink); stroke-width: 2; }
.physics-drawing .physics-trace { fill: none; stroke: var(--ink); stroke-width: 2; }
.physics-drawing .physics-dashed { stroke-dasharray: 5 4; }
.physics-drawing .physics-center { text-anchor: middle; }
.physics-drawing .physics-end { text-anchor: end; }
.science-drawing.physics-drawing text { font-size: 18px; }
.lab-parameters .parameter[hidden] { display: none; }
.topics details { min-width: 0; }
.topics details > a { display: block; }
.topics summary { padding: 10px; cursor: pointer; font-weight: 600; font-size: 15px; }
.topics { max-height: calc(100dvh - 32px); overflow-y: auto; }
.domain-nav { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 24px 0; }
.domain-nav a { padding-block: 8px; }
.course-language, .course-meta, .course-status { font-family: var(--font-data, "Atkinson Hyperlegible Next", sans-serif); font-size: 14px; }
.course-language { color: var(--muted); }
.article .course-meta { color: var(--muted); margin: 8px 0; }
.article .course-status { color: var(--ink); margin: 8px 0 0; }
.topic-card h3 { margin: 0 0 8px; font-size: 24px; }
.article:has(.course-group) > h1, .article:has(.university-lesson) > h1 { font-size: 36px; }
.topic-card h3 a { text-decoration: none; }
.topic-card h3 a:hover { text-decoration: underline; }
.course-group { scroll-margin-top: 24px; }
.course-group > h2 { margin-top: 42px; }
.lesson-toc { margin: 28px 0 36px; }
.lesson-toc ol { padding-left: 24px; }
.lesson-toc li { padding-block: 5px; }
.university-lesson { scroll-margin-top: 20px; margin-top: 48px; }
.university-lesson > p, .worked-example p { max-width: 72ch; }
.formula, .lab-values, .science-lab input, .science-lab select, .science-lab button, .science-lab textarea {
  font-family: var(--font-data, "Atkinson Hyperlegible Next", sans-serif);
  font-variant-numeric: tabular-nums;
}
.formula { font-size: .95em; overflow-wrap: anywhere; }
.worked-example { margin-block: 24px; padding-block: 12px; border-block: 1px solid var(--line); }
.worked-example h3 { margin-top: 0; }
.article pre { max-width: 100%; overflow-x: auto; }
.course-reference { margin-top: 36px; }
.science-lab { margin-top: 32px; border: 1px solid var(--line); padding: 20px; border-radius: 12px; min-width: 0; }
.science-lab > h3 { font-size: 22px; margin-top: 0; }
.lab-visual { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(145px, 1fr); gap: 20px; }
.lab-visual figure { margin: 0; min-width: 0; }
.science-drawing svg { display: block; width: 100%; height: auto; overflow: hidden; background: var(--bg); color: var(--ink); }
.science-drawing text { fill: var(--ink); font: 14px var(--font-data, "Atkinson Hyperlegible Next", sans-serif); }
.science-drawing line { stroke: var(--ink); stroke-width: 2; }
.science-drawing .axis { stroke: var(--line); stroke-width: 1; }
.science-drawing .first { stroke: var(--ink); }
.science-drawing .second { stroke: var(--ok); }
.science-drawing text.second { fill: var(--ok); stroke: none; }
.science-drawing .vector { marker-end: var(--arrow); stroke-width: 2.5; }
.science-drawing .guide, .science-drawing .residual { stroke-dasharray: 5 4; stroke-width: 1.5; }
.science-drawing circle:not(.constraint) { fill: var(--ink); }
.science-drawing .contour, .science-drawing .constraint { fill: none; stroke: var(--line); stroke-width: 1.5; }
.science-drawing .constraint { stroke: var(--ink); stroke-width: 2; }
.science-drawing .region { fill: var(--accent-soft); stroke: var(--ok); }
.science-drawing .density-cell { fill: var(--ink); stroke: var(--line); stroke-width: 1; }
.science-drawing .center-line { stroke: var(--ink); stroke-dasharray: 3 3; }
.science-lab figure figcaption { font-size: 15px; color: var(--muted); margin-block: 12px; text-align: left; }
.lab-parameters { min-width: 0; padding-top: 4px; }
.parameter { display: grid; grid-template-columns: minmax(0, 1fr) 80px; gap: 6px 8px; align-items: center; margin-bottom: 18px; }
.parameter input[type="range"] { grid-column: 1 / -1; width: 100%; accent-color: var(--ink); min-height: 32px; }
.science-lab label { display: block; font: 15px/1.5 var(--font-data, "Atkinson Hyperlegible Next", sans-serif); }
.science-lab input:not([type="range"]), .science-lab select, .science-lab textarea {
  background: var(--bg); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; min-height: 44px; padding: 8px; font-size: 16px; max-width: 100%; width: 100%;
}
.science-lab [aria-invalid="true"] { outline: 2px solid var(--warn); outline-offset: 2px; }
.science-lab button { min-height: 44px; padding: 9px 12px; background: var(--panel); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; font-size: 14px; cursor: pointer; }
.science-lab button:hover:not(:disabled) { background: var(--accent-soft); }
.science-lab button:disabled { opacity: .55; cursor: default; }
.science-lab button.primary { background: var(--ink); color: var(--bg); margin-top: 12px; }
.science-lab button.primary:hover { background: var(--muted); }
.science-lab .lab-values { display: table; width: 100%; table-layout: fixed; border-collapse: collapse; font-size: 14px; margin: 20px 0; }
.lab-values caption { text-align: left; color: var(--muted); padding-bottom: 10px; }
.lab-values th, .lab-values td { padding: 8px; border-bottom: 1px solid var(--line); text-align: left; overflow-wrap: anywhere; }
.lab-values th { width: 60%; font-weight: 400; }
.lab-values td { font-weight: 600; }
.science-practice { border-top: 1px solid var(--line); padding-top: 20px; }
.science-practice > h3 { margin-top: 0; }
.science-practice form { display: grid; gap: 8px; }
.science-practice h4:focus { outline: 2px solid var(--ink); outline-offset: 5px; }
.exercise-statement { margin-top: 24px; }
.exercise-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-block: 16px; }
.answer-help, .exercise-journal, .exercise-feedback, .parameter-error { font-size: 14px; }
.exercise-feedback[data-state="error"], .parameter-error { color: var(--warn); }
.exercise-feedback[data-state="hint"] { color: var(--ink); }
.exercise-journal { padding-left: 22px; }
.exercise-journal li { padding-bottom: 8px; }
@media (max-width: 860px) {
  .topics { max-height: none; overflow: visible; }
  .topics details { flex: 1 1 160px; }
}
@media (max-width: 600px) {
  .lab-visual { grid-template-columns: minmax(0, 1fr); }
  .science-lab { padding: 14px; }
  .parameter { grid-template-columns: minmax(0, 1fr) 90px; }
  .science-lab .lab-values { display: table; table-layout: fixed; }
  .science-lab .lab-values th { width: 56%; }
  .course-language { flex-basis: 100%; }
}

.science-drawing .engineering-on { stroke-width: 3.5; }

@media (max-width: 600px) { .article:has(.university-lesson) > h1.control-course-title { font-size: clamp(1.5rem, 8vw, 2rem); } }

.chance-drawing .chance-hatch{stroke:currentColor;stroke-width:1;opacity:.35}
.chance-drawing .chance-area{stroke:none}
.chance-drawing .chance-applied{stroke-width:3}
.lab-parameters .lab-actions{display:flex;flex-wrap:wrap;gap:.5rem}
.lab-actions>label,.lab-actions>select{width:100%}

.science-lab .space-select { display: block; }
.space-select label { display: block; margin-bottom: .4rem; }
.space-select select { width: 100%; }

/* Reading navigation: no catalogue wall before the lesson on small screens. */
.learn-page .wrap { display: block; max-width: 1080px; }
.learn-page .topics { position: static; display: flex; flex-flow: row wrap; align-items: start; justify-content: space-between; gap: 8px; max-height: none; overflow: visible; margin-bottom: 16px; }
.learn-page .course-switcher { flex: 0 1 auto; }
.learn-page .course-switcher > summary { min-height: 44px; padding: 9px 12px; font: 16px/1.6 var(--font-data, sans-serif); }
.learn-page .course-switcher[open] { flex: 1 1 100%; }
.learn-page .course-menu-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; max-height: 55dvh; overflow: auto; padding: 8px; }
.course-menu-list .menu-search, .course-menu-list > p { grid-column: 1 / -1; }
.menu-search { display: grid; gap: 6px; font: 15px/1.5 var(--font-data, sans-serif); }
.learn-page .course-menu-list > details { min-width: 0; }
.learn-page .article { padding: 28px 32px; }
.learn-catalogue .topics { display: none; }
.catalogue-controls { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 12px 20px; margin: 28px 0 12px; }
.catalogue-controls label { display: grid; gap: 6px; font: 16px/1.5 var(--font-data, sans-serif); }
.catalogue-count { margin: 0; grid-column: 1 / -1; font: 14px/1.5 var(--font-data, sans-serif); }
.catalogue-controls button { justify-self: start; }
.catalogue-controls input, .catalogue-controls select, .menu-search input, .lesson-navigation select { width: 100%; min-width: 0; min-height: 44px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); font: 16px/1.5 var(--font-data, sans-serif); }
.catalogue-controls input::placeholder, .menu-search input::placeholder { color: var(--muted); opacity: 1; }
.learn-catalogue .course-group > h2 { margin-top: 16px; }
.learn-catalogue .topic-card { padding-block: 16px; }
.learn-catalogue .topic-card h3 { font-size: 22px; }
.learn-catalogue .topic-card .course-meta { margin-top: 8px; }
.course-reader .site-header .course-language { display: none; }
.course-reader .article > h1 { font-size: 30px; text-wrap: balance; }
.course-about { margin: 12px 0 20px; }
.course-about > summary { cursor: pointer; min-height: 44px; padding-block: 10px; font: 15px/1.5 var(--font-data, sans-serif); }
.course-about > .lead { margin-top: 12px; font-size: 17px; }
.course-about .domain-nav { margin-block: 12px; }
.course-sources { border-top: 1px solid var(--line); margin: 28px 0 0; }
.course-sources .article h2 { margin-top: 16px; }
.lesson-navigation { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 24px; scroll-margin-top: 16px; }
.lesson-navigation > label { grid-column: 1 / -1; font: 15px/1.5 var(--font-data, sans-serif); }
.lesson-moves { display: flex; gap: 12px; align-items: center; }
.lesson-position { white-space: nowrap; font: 15px/1.5 var(--font-data, sans-serif); font-variant-numeric: tabular-nums; }
.lesson-moves button, .lesson-tabs button, .catalogue-controls button, .lesson-panel .science-practice button { min-height: 44px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--ink); font: 15px/1.5 var(--font-data, sans-serif); cursor: pointer; }
.lesson-moves button:disabled, .lesson-panel .science-practice button:disabled { opacity: .55; cursor: default; }
.lesson-moves button:hover:not(:disabled), .lesson-tabs button:hover, .catalogue-controls button:hover, .lesson-panel .science-practice button:hover:not(:disabled) { background: var(--accent-soft); }
.course-reader .university-lesson { margin-top: 20px; }
.course-reader .university-lesson > h2 { margin: 0 0 16px; border: 0; padding-top: 0; font-size: 24px; text-wrap: balance; }
.lesson-tabs { display: flex; gap: 4px; padding-bottom: 8px; margin-bottom: 20px; border-bottom: 1px solid var(--line); }
.lesson-tabs button { flex: 1; border-color: transparent; border-radius: 6px 6px 0 0; }
.lesson-tabs [aria-selected="true"] { border-color: var(--line); background: var(--accent-soft); font-weight: 700; }
.course-reader .worked-path > h3 { margin-top: 0; }
.course-reader .solution-steps { margin-block: 16px; }
.course-reader .solution-steps > li { margin-bottom: 12px; padding-bottom: 12px; }
.course-reader .equation-scroll { padding-block: 12px; margin-block: 8px; }
.course-reader .lesson-panel .science-lab { margin-top: 0; border: 0; padding: 0; }
.course-reader .science-lab > h3, .course-reader .science-lab > .lab-fallback { display: none; }
.visual-values { margin-top: 16px; }
.visual-values > summary { cursor: pointer; min-height: 44px; padding-block: 10px; font: 16px/1.5 var(--font-data, sans-serif); }
.lesson-panel .science-practice { border: 0; padding-top: 0; }
.lesson-panel .science-practice > h3 { margin-top: 0; }
.lesson-panel .science-practice select { width: 100%; min-height: 44px; padding: 8px; border: 1px solid var(--line); border-radius: 6px; color: var(--ink); background: var(--bg); font: 16px/1.5 var(--font-data, sans-serif); }
.lesson-panel .science-practice label { display: block; font: 15px/1.5 var(--font-data, sans-serif); }
.lesson-panel .science-practice .primary { background: var(--ink); color: var(--bg); }
.lesson-panel .science-practice button.primary:hover:not(:disabled) { background: var(--muted); color: var(--bg); }
.lesson-panel .science-practice [aria-invalid="true"] { outline: 2px solid var(--warn); outline-offset: 2px; }
@media (max-width: 600px) {
  .learn-page .wrap { padding: 16px 12px; }
  .learn-page .article { padding: 20px 16px; }
  .course-reader .article > h1.control-course-title, .course-reader .article > h1 { font-size: 26px; }
  .course-reader .site-header { padding: 12px 16px; gap: 8px; }
  .course-reader .site-header .cta-small { display: none; }
  .course-reader .site-header .theme-toggle { margin-left: auto; }
  .learn-page .course-menu-list { grid-template-columns: minmax(0, 1fr); }
  .lesson-navigation, .catalogue-controls { grid-template-columns: minmax(0, 1fr); }
  .lesson-moves { justify-content: space-between; }
  .course-reader .university-lesson > h2 { font-size: 21px; }
  .lesson-tabs { gap: 0; }
  .lesson-tabs button { padding-inline: 5px; font-size: 14px; }
}
@media print {
  .course-reader .lesson-navigation, .course-reader .lesson-tabs, .learn-page .topics { display: none; }
  .course-reader .university-lesson[hidden], .course-reader .lesson-panel[hidden] { display: block !important; }
}