/* The supplied design tokens remain canonical in reference.css. */
.knn-tie{font-size:10px;line-height:1.9;color:#815d35;background:#fbf0df;border:1px solid #e6d0aa;border-radius:6px;padding:9px;margin:10px 0!important}
.analogy-map,.exercise-results{width:100%;border-collapse:collapse;margin-block:22px;font-size:13px;background:var(--white)}.analogy-map th,.exercise-results th{background:#e6f1eb;color:#225d42}.analogy-map th,.analogy-map td,.exercise-results th,.exercise-results td{padding:11px 14px;border:1px solid var(--line);line-height:1.9;text-align:right}.analogy-map tbody tr:nth-child(even),.exercise-results tbody tr:nth-child(even){background:#f5f8f1}.exercise-results{direction:rtl}.exercise-results th,.exercise-results td{text-align:center}.exercise-results td{height:45px}.knn-pause{font-size:11px;color:#617b65;line-height:1.9;margin:18px 0 8px!important}.knn-reveal{display:block;width:100%;border:1px solid #c5d8c7;border-radius:7px;background:#e8f1e4;color:#275c3b;min-height:44px;padding:9px;font:inherit;font-size:11px;cursor:pointer;margin-bottom:12px}.knn-reveal:hover{border-color:#0f766e;background:#dfecdc}.knn-reveal:focus-visible{outline:2px solid #0f766e;outline-offset:3px}
@media(max-width:760px){.analogy-map,.exercise-results{font-size:11px}.analogy-map th,.analogy-map td,.exercise-results th,.exercise-results td{padding:9px 8px}}
.consult-votes{display:flex;gap:10px;margin-block:25px}.consult-votes>div{flex:1;text-align:center;padding:20px 8px;border:1px solid var(--line);border-radius:9px;background:var(--white)}.consult-votes span{display:block;font-size:11px;color:#667d6a}.consult-votes strong{display:block;font-size:18px;margin-top:7px}.vote-yes{color:#0f766e}.vote-no{color:#bd603e}.medical-table{min-width:430px}.medical-table .class-0{color:#0f766e!important}.medical-table .class-1{color:#a34e31!important}.neighbor-readout td{font-variant-numeric:tabular-nums}.knn-explorer{border:1px solid var(--line);border-radius:16px;background:var(--white);padding:24px;margin-block:32px}.knn-explorer-head{display:flex;justify-content:space-between;align-items:center;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:22px}.knn-explorer .lab-kicker{color:#9f5f3f}.knn-explorer h3{font-size:22px;line-height:1.7;font-weight:700;margin-top:5px}.knn-reset{font:inherit;font-size:11px;min-height:44px;padding:8px 13px;border:1px solid var(--line-strong);border-radius:7px;background:#f2f6ef;color:#3b6748;cursor:pointer;white-space:nowrap}.knn-explorer-grid{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(220px,.95fr);gap:22px;direction:ltr}.knn-plot{min-width:0}.knn-plot svg,.knn-plot img{display:block;width:100%;height:auto;aspect-ratio:560/540}.knn-plot svg{cursor:crosshair;touch-action:none;user-select:none;border-radius:10px;background:#f7faf4}.knn-panel{direction:rtl;padding:18px;border:1px solid #dce7d9;border-radius:10px;background:#f7faf4;min-width:0}.knn-query{font-size:16px;margin-bottom:20px;text-align:left;color:#234c36}.knn-panel label{display:flex;justify-content:space-between;align-items:center;font-size:11px;margin-top:15px;color:#4f7158}.knn-panel output{direction:ltr}.knn-panel input[type=range]{display:block;direction:ltr;width:100%;height:28px;accent-color:#0f766e;cursor:pointer;margin-block:5px 12px}.knn-k{display:flex;direction:ltr;gap:5px;margin-top:22px}.knn-k button{flex:1;min-height:44px;border:1px solid #c5d8c7;border-radius:6px;font:inherit;font-size:12px;color:#376747;background:white;cursor:pointer;white-space:nowrap}.knn-k button[aria-pressed=true]{background:#0f766e;color:white;border-color:#0f766e}.knn-vote-summary{font-size:11px;line-height:2;margin:17px 0 8px!important;color:#56745a}.knn-prediction{font-size:13px;line-height:1.9;color:#244c35;font-weight:700;margin:0 0 14px!important}.knn-neighbor-list{padding-inline-start:20px;margin:0;font-size:11px;color:#71876d}.knn-neighbor-list li{padding:7px 0;border-top:1px solid #dce7d9}.knn-neighbor-list strong{font-size:12px;font-weight:700;color:#335c3f;margin-inline-end:9px}.knn-neighbor-list span{font-size:10px}.knn-explorer-note{font-size:11px;line-height:2;color:#637d66;margin:18px 0 0!important}.knn-explorer button:focus-visible,.knn-plot svg:focus-visible,.knn-panel input:focus-visible{outline:2px solid #0f766e;outline-offset:3px}
@media(max-width:760px){.consult-votes{gap:6px}.consult-votes>div{padding:15px 4px}.consult-votes span{font-size:9px}.consult-votes strong{font-size:15px}.knn-explorer{padding:16px}.knn-explorer-head{align-items:flex-start;gap:10px}.knn-explorer h3{font-size:19px}.knn-reset{font-size:10px;white-space:normal;min-width:85px}.knn-explorer-grid{grid-template-columns:1fr;gap:14px}.knn-panel{padding:16px}.knn-panel label{font-size:12px}.knn-explorer-note{font-size:10px}.knn-neighbor-list li{display:flex;gap:12px}.knn-neighbor-list span{font-size:11px}}
@media print{.knn-explorer{display:none}}
/* Keep the course name together; scale its type to the available hero column. */
.hero.course-hero h1{max-width:none;font-size:clamp(24px,4.2vw,56px);line-height:1.3}
.course-title-line{display:inline-block;white-space:nowrap;direction:ltr;unicode-bidi:isolate}
.brand .brand-mark{width:36px;height:36px;flex:0 0 auto;border-radius:10px}
.instructor-credit{display:flex;align-items:center;gap:12px;width:fit-content;margin:22px 0 0 auto;line-height:1.6;letter-spacing:0;font-size:13px;color:var(--ink)}
.instructor-credit>span{font-size:10px;color:var(--muted);padding-right:12px;border-right:1px solid var(--line-strong)}
.instructor-credit strong{font-weight:700}.footer-credit .instructor-credit{margin-top:8px;font-size:12px}.footer-credit>p{margin:0}
.space-view{direction:ltr;min-width:0}.space-canvas,.space-fallback{display:block;width:100%;height:auto;aspect-ratio:13/10}
.space-view:not(.is-ready) .space-tools{display:none}
.problem-role-lab{border:1px solid var(--line);border-radius:12px;background:var(--white);padding:22px;margin-block:25px 30px}.role-switch{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.role-switch button{border:1px solid var(--line-strong);border-radius:7px;padding:9px 13px;background:var(--paper);color:var(--muted);font:inherit;font-size:12px;cursor:pointer;min-height:44px}.role-switch button[aria-pressed=true]{background:var(--teal-deep);border-color:var(--teal-deep);color:white}.role-switch button:focus-visible{outline:2px solid var(--teal);outline-offset:3px}.role-map{direction:ltr;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.role-map>div{direction:rtl;border-radius:8px;padding:16px 8px;font-size:13px;text-align:center}.role-map span{display:block;font-size:10px;margin-top:6px}.role-identifier{background:#eef1ec;color:#657566}.role-feature{background:#e6f1eb;color:#225d42;border:1px solid #c9ded0}.role-target{background:#faebdf;color:#8b4e2c;border:1px solid #e8c7ad}.role-explanation{font-size:12px;line-height:2;color:#526d5a;margin:17px 0 0!important}.prediction-device-table th:nth-child(2),.prediction-device-table td:nth-child(2){background:#faebdf!important;color:#8b4e2c}.prediction-device-table th:nth-child(3),.prediction-device-table td:nth-child(3),.prediction-device-table th:nth-child(4),.prediction-device-table td:nth-child(4){background:#e6f1eb!important;color:#225d42}.problem-comparison{width:100%;border-collapse:collapse;background:var(--white);margin-block:24px;font-size:14px;min-width:440px}.problem-comparison th{background:#e6f1eb;color:#225d42}.problem-comparison th,.problem-comparison td{padding:13px 16px;text-align:right;border:1px solid var(--line);line-height:1.9}.problem-comparison tbody tr:nth-child(even){background:#f6f9f3}.prediction-figure figcaption{font-size:11px;line-height:1.9;color:#637d69;margin-top:8px}.adjacent-lessons{display:flex;flex-wrap:wrap;gap:12px;margin-top:44px}.adjacent-lessons a{display:block;flex:1 1 270px;background:var(--white);border:1px solid var(--line);border-radius:9px;padding:16px 20px;text-decoration:none;color:var(--teal-deep);font-size:12px;line-height:1.9}.adjacent-lessons a:hover{border-color:var(--teal);background:#eef5eb}
@media(max-width:760px){.problem-role-lab{padding:16px}.role-switch button{font-size:11px;flex:1 1 140px}.role-map{gap:5px}.role-map>div{font-size:11px;padding:12px 4px}.role-map span{font-size:9px}.role-explanation{font-size:11px}.problem-comparison{font-size:12px}.problem-comparison th,.problem-comparison td{padding:10px 12px}.adjacent-lessons a{font-size:11px}}
.space-canvas{cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none;border-radius:10px;background:radial-gradient(ellipse at center,#fbfdfa 0%,#f0f5ef 100%)}
.space-canvas:focus-visible{outline:2px solid var(--teal);outline-offset:3px}.space-view.is-dragging .space-canvas{cursor:grabbing}
.space-tools{direction:rtl;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin-top:9px;padding-top:10px;border-top:1px solid var(--line)}
.space-tools>p{font-family:var(--font-body);font-size:10px;color:var(--muted);margin:0}.space-tools>p>span{margin-right:6px;color:var(--teal)}
.space-controls{display:flex;direction:ltr;gap:4px}.space-controls button{min-width:32px;min-height:36px;padding:4px 8px;border:1px solid var(--line-strong);border-radius:7px;background:var(--white);color:var(--ink);cursor:pointer;font-family:var(--font-body);font-size:12px}
.space-controls button:hover{background:var(--teal-tint);border-color:var(--teal)}.space-controls button:focus-visible{outline:2px solid var(--teal);outline-offset:2px}.space-controls button[data-orbit=reset]{font-size:10px;margin-left:4px;direction:rtl}
.space-legend{direction:rtl;font-size:10px;line-height:1.9;text-align:center;color:var(--muted);margin:10px 0 6px}.interactive-distance{padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--white)}
.interactive-distance figcaption{font-size:11px;color:var(--muted);margin-top:12px;line-height:1.9}
@media(max-width:760px){.brand .brand-mark{width:30px;height:30px}.instructor-credit{font-size:12px;margin-top:18px}.footer-credit{flex-basis:100%;order:3}.space-controls button{min-width:36px;min-height:40px}.space-tools{justify-content:center}.space-tools>p{flex-basis:100%;text-align:center}.interactive-distance{padding:10px}}
@media print{.space-tools,.space-legend,.space-canvas{display:none!important}.space-view .space-fallback{display:block!important}.footer-credit{display:none}}
@font-face{font-family:Vazirmatn;src:url('fonts/Vazirmatn-Regular.woff2?v=b4d4c5bccbb7d6d6') format('woff2'),url('fonts/Vazirmatn-Regular.ttf?v=b4d4c5bccbb7d6d6') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:Vazirmatn;src:url('fonts/Vazirmatn-Bold.woff2?v=b4d4c5bccbb7d6d6') format('woff2'),url('fonts/Vazirmatn-Bold.ttf?v=b4d4c5bccbb7d6d6') format('truetype');font-weight:600 900;font-display:swap}
:root{--font-body:Vazirmatn,Tahoma,sans-serif;--font-display:Vazirmatn,Tahoma,sans-serif}
body{font-size:16px;line-height:1.95;overflow-wrap:break-word}
[hidden]{display:none!important}
.header-inner{gap:24px;position:relative}.brand{gap:11px;white-space:nowrap;font-family:var(--font-display);font-size:20px;font-weight:700;letter-spacing:0}
.site-nav a,.header-query-link{font-size:13px;letter-spacing:0}.site-nav{gap:24px}.header-query-link{margin-inline-start:auto;white-space:nowrap}
.menu-toggle{display:none;border:1px solid var(--line);background:var(--white);border-radius:8px;padding:7px 11px;font-size:12px;cursor:pointer;min-height:44px}
.skip-link{left:auto;right:12px}.hero h1{max-width:14ch;font-size:clamp(42px,5.3vw,70px);font-weight:700;line-height:1.4;letter-spacing:-.025em}.hero h1 em{font-style:normal;font-weight:700}
.hero-grid{grid-template-columns:minmax(0,1.1fr) minmax(340px,.9fr)}.hero-grid--single{grid-template-columns:1fr}.hero-lede{font-size:17px;line-height:2;max-width:60ch}.hero-lede p{margin:0}.hero-actions{gap:16px 22px}
.eyebrow,.section-kicker,.table-kicker,.figure-label,.figure-status,.rail-title,.rail-fact p,.lab-kicker{letter-spacing:0;text-transform:none}
.eyebrow{font-size:12px;line-height:1.9}.hero-meta{font-family:var(--font-body);font-size:11px;letter-spacing:0}.hero-meta span+span::before{margin-right:0;margin-inline-end:8px}.button-primary{font-size:13px;gap:24px;line-height:1.7}
.hero-figure img{display:block;width:100%;height:auto}.figure-topline{font-size:11px;gap:12px}.figure-label,.figure-status{font-size:10.5px}.hero-figure figcaption{font-size:10.5px;line-height:1.9;color:var(--muted);text-align:center}.hero-figure{min-width:0;animation:none}.hero-copy{animation:none}
.hero-strip li{gap:16px}.hero-strip li+li{border-left:0;border-inline-start:1px solid var(--line);padding-left:0;padding-inline-start:26px}.strip-number{font-family:var(--font-mono);font-size:24px}.strip-text{font-size:12px;line-height:1.8}
.breadcrumb{display:inline-flex;align-items:center;gap:10px;color:var(--muted);font-size:11px;text-decoration:none;margin-bottom:19px}.breadcrumb:hover{color:var(--teal)}.breadcrumb span{color:var(--line-strong)}
.catalog-section{padding-block:70px 100px}.catalog-head{display:flex;justify-content:space-between;align-items:end;gap:32px;margin-bottom:30px}.catalog-head h2{font-family:var(--font-display);font-size:clamp(26px,3.4vw,42px);letter-spacing:-.02em;line-height:1.6;margin-top:9px;font-weight:700}.section-kicker{font-size:11px;line-height:1.8}.section-kicker>span{padding-right:0;padding-inline-end:10px;border-right:0;border-inline-end:1px solid var(--line-strong)}
.catalog-search{min-width:280px;max-width:360px;flex:0 1 360px}.catalog-search label{display:block;font-size:11px;color:var(--muted);margin-bottom:7px}.catalog-search>div{position:relative}.catalog-search input{width:100%;border:1px solid var(--line);background:var(--white);padding:12px 14px 12px 45px;border-radius:8px;font-size:13px;color:var(--ink);outline-offset:3px}.catalog-search button{position:absolute;left:10px;top:7px;background:none;border:0;width:32px;height:32px;cursor:pointer;font-size:22px;color:var(--muted)}
.course-grid{display:grid;gap:24px}.course-card{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(260px,.7fr);border:1px solid var(--line);border-radius:var(--radius-l);background:var(--white);box-shadow:var(--shadow-soft);overflow:hidden}.course-card-copy{padding:32px 36px}.course-card-meta{display:flex;align-items:center;gap:14px;color:var(--muted);font-size:11px;margin-bottom:20px}.course-type{padding:3px 10px;background:var(--teal-tint);border-radius:4px;color:var(--teal-deep)}.course-card h3{font-size:30px;font-weight:700;line-height:1.5;margin-bottom:14px}.course-card h3 a,.course-latest>a,.lesson-list-card h3 a{text-decoration:none}.course-card h3 a:hover,.course-latest>a:hover,.lesson-list-card h3 a:hover{color:var(--teal)}.course-card-copy>p{color:var(--muted);font-size:14px;max-width:55ch;margin-bottom:26px}.text-link{display:inline-flex;align-items:center;gap:20px;text-decoration:none;font-size:13px;font-weight:700;color:var(--teal-deep)}.text-link:hover{color:var(--coral-ink)}
.course-latest{padding:29px 32px;background:var(--teal-tint-2);border-inline-start:1px solid var(--line);display:flex;flex-direction:column;align-items:start;justify-content:center}.latest-label{color:var(--muted);font-size:10.5px}.lesson-number{display:block;font-family:var(--font-mono);font-size:34px;line-height:1.4;letter-spacing:-.06em;color:var(--coral);margin-block:10px}.course-latest>a{font-size:18px;line-height:1.8;font-weight:700}.tag-list{display:flex;flex-wrap:wrap;gap:7px;margin-top:15px}.tag-list span{padding:3px 8px;border:1px solid var(--line);border-radius:4px;font-size:10px;color:var(--muted);background:var(--white)}.empty-state{padding:50px;text-align:center;border:1px dashed var(--line-strong);border-radius:var(--radius-m);color:var(--muted)}
.course-lessons{border-top:1px solid var(--line)}.lesson-list{display:grid;gap:20px}.lesson-list-card{display:grid;grid-template-columns:60px minmax(0,1fr) auto;gap:24px;align-items:center;padding:30px 32px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius-m);box-shadow:var(--shadow-soft)}.lesson-list-card h3{font-size:23px;font-weight:700;line-height:1.8;margin:6px 0 9px}.lesson-list-card p{font-size:13px;color:var(--muted)}.lesson-list-card .text-link{align-self:end;white-space:nowrap}
.lesson-shell{grid-template-columns:190px minmax(0,860px);gap:clamp(30px,4.5vw,68px)}.lesson-rail{top:96px}.rail-list{border-left:0;border-inline-start:1px solid var(--line)}.rail-list a{padding:9px 14px 9px 10px;margin-left:0;margin-inline-start:-1px;border-left:0;border-inline-start:2px solid transparent;font-size:12px;line-height:1.7}.rail-list a.is-current{border-left:0;border-inline-start-color:var(--teal)}.rail-fact{padding:17px 14px 0 0}.rail-fact p{font-size:10px}.rail-fact strong{font-family:var(--font-mono);font-size:27px;line-height:1.4}.rail-fact span{font-size:10px}.rail-title{font-size:11px}.rail-download{display:block;margin-top:18px;color:var(--teal-deep);font-size:11px;text-decoration:none}.rail-download:hover{color:var(--coral-ink)}.reading-state{margin-top:22px;font-size:10px;color:var(--muted)}.reading-state>div{height:3px;background:var(--line);border-radius:4px;margin-top:9px;overflow:hidden}.reading-state i{display:block;width:0;height:100%;background:var(--teal);transition:width .12s linear}
#reading-progress{position:fixed;inset:0 0 auto 0;height:3px;background:var(--coral);z-index:210;transform:scaleX(0);transform-origin:right;pointer-events:none}
.section-head h2{font-family:var(--font-display);max-width:28ch;font-size:clamp(28px,3.2vw,41px);font-weight:700;line-height:1.65;letter-spacing:-.02em;margin-top:14px}.section-head{margin-bottom:28px}.lesson-section{margin-bottom:80px}.lesson-prose{font-size:17px;line-height:2.05;color:var(--ink-soft)}.lesson-prose>p{margin-block:20px}.lesson-prose p:first-child{margin-top:0}.lesson-prose b{font-weight:700;color:var(--ink)}.lesson-prose em{font-style:normal;color:var(--teal-deep);font-weight:700}.lesson-prose code{font-family:var(--font-mono);font-size:.81em;direction:ltr;unicode-bidi:embed;display:inline-block;border-radius:4px;background:var(--teal-tint);color:var(--teal-deep);padding:.05em .28em;line-height:1.65;vertical-align:baseline;max-width:100%;overflow-wrap:anywhere}.lesson-prose>p{max-width:100%;text-align:start}
.table-card{margin-block:28px}.table-card-head h3{font-family:var(--font-display);font-weight:700;font-size:20px;line-height:1.6}.table-kicker{font-size:10px;line-height:1.7}.sample-count{font-size:10px;font-family:var(--font-body)}.table-scroll{max-width:100%;overflow-x:auto;scrollbar-color:var(--line-strong) transparent;overscroll-behavior-inline:contain}.dataset-table{direction:ltr;min-width:500px;line-height:1.6}.dataset-table th,.dataset-table td{text-align:center;white-space:nowrap}.dataset-table td{font-variant-numeric:tabular-nums;font-size:14px}.dataset-table th{font-size:12px}.dataset-table th:not(:first-child),.dataset-table td:not(:first-child){background:var(--teal-tint-2)}.dataset-table tr.is-selected td{background:var(--teal-tint)}.dataset-table tr:hover td{background:var(--teal-tint)}.sample-select{border:0;background:var(--ink);color:var(--white);border-radius:50%;width:30px;height:30px;font-family:var(--font-mono);font-size:12px;cursor:pointer}.sample-select:hover,.sample-select[aria-pressed=true]{background:var(--coral)}.feature-select{background:none;border:0;padding:5px;cursor:pointer;color:var(--teal-deep);font-weight:700;min-height:32px}.feature-select:hover{text-decoration:underline}.table-readout{border-top:1px solid var(--line);padding:15px 20px;font-size:11px;color:var(--muted);min-height:52px;background:var(--white)}.table-readout strong{color:var(--teal-deep)}.table-readout code{display:block;direction:ltr;text-align:left;white-space:nowrap;overflow-x:auto;max-width:100%;font-size:12px;margin-top:7px;background:var(--teal-tint-2);padding:8px 10px}
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.lesson-formula{margin-block:30px;direction:ltr;text-align:center;max-width:100%;overflow-x:auto;padding:25px 20px;font-size:1.1rem;color:var(--ink);background:var(--white)}.lesson-formula .katex-display{margin:0}.lesson-formula .katex{white-space:nowrap}.lesson-formula code{font-size:13px}.teaching-figure{margin:28px auto;max-width:100%;text-align:center}.teaching-figure img{display:block;width:100%;height:auto}.teaching-figure.space{max-width:610px}.teaching-figure.diagram{max-width:690px}.teaching-figure.reduction{max-width:100%}.note{font-size:15px;line-height:2.05;margin-block:25px}.sources{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:23px;margin-top:35px}.sources>div{font-family:var(--font-mono);font-size:11px;margin-top:8px}.sources a{color:var(--teal-deep)}
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.tasks{list-style:decimal;padding-inline-start:24px}.tasks li{padding-inline-start:8px;margin-block:22px}.answer{width:100%;border-collapse:collapse;border:1px solid var(--line);font-size:12px;min-width:580px;background:var(--white)}.answer th{font-weight:700;text-align:start;padding:12px 14px;background:var(--teal-tint);color:var(--teal-deep);border-bottom:1px solid var(--line)}.answer td{padding:12px;border-bottom:1px solid var(--line);vertical-align:top}.answer td:first-child{width:110px;color:var(--ink-soft);font-size:12px}.answer textarea{width:100%;min-width:150px;resize:vertical;background:var(--white);font-family:var(--font-body);font-size:12px;padding:8px;border:1px solid var(--line);border-radius:5px;color:var(--ink);line-height:1.8}.answer-note{font-size:11px!important;color:var(--muted);line-height:1.8}.answer-scroll{margin-block:28px 0}.lesson-footer{font-size:12px;gap:20px}.lesson-footer a{color:var(--teal-deep)}
.site-footer{border-top:1px solid var(--line);background:var(--paper-deep);padding-block:28px}.site-footer>.shell{display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap}.site-footer .brand{font-size:16px}.site-footer p,.site-footer>.shell>a:last-child{font-size:11px;color:var(--muted);text-decoration:none}.site-footer>.shell>a:last-child:hover{color:var(--teal)}
#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,12px);background:var(--ink);color:var(--white);font-size:12px;padding:10px 18px;border-radius:8px;box-shadow:var(--shadow-lab);z-index:250;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;max-width:calc(100% - 36px);text-align:center}#toast.is-visible{opacity:1;transform:translate(-50%,0)}
/* Keep KaTeX independent of the reference's hand-authored .formula radicals. */
.formula-card.lesson-formula{color:#15211f;background:#fbfdfa;border:1px solid #cdd8d2;box-shadow:var(--shadow-soft)}
.lesson-formula .katex,.lesson-formula .katex .sqrt{color:inherit;opacity:1}
.lesson-formula .katex svg{fill:currentColor}
@media(min-width:1600px){.lesson-shell{gap:78px}}
@media(max-width:1100px){.site-nav{gap:16px}.hero-grid{gap:35px}.hero h1{font-size:clamp(40px,5.3vw,60px)}.lesson-shell{grid-template-columns:165px minmax(0,1fr);gap:30px}.rail-list a{font-size:11px;padding-inline-start:10px}.hero-strip{gap:18px}.hero-strip li+li{padding-inline-start:18px}.lesson-list-card{grid-template-columns:50px minmax(0,1fr)}.lesson-list-card>.text-link{grid-column:2}.lesson-prose{font-size:16.5px}}
@media(max-width:900px){.hero-grid{grid-template-columns:minmax(0,1fr) minmax(300px,.85fr)}.hero h1{font-size:43px}.hero-lede{font-size:15px}.hero-meta{font-size:10px}.brand{font-size:18px}.site-nav a{font-size:11px}.header-query-link{font-size:11px}.lesson-shell{grid-template-columns:minmax(0,1fr);max-width:820px}.lesson-rail{display:none}.mobile-toc{display:flex;position:sticky;top:70px;z-index:20;gap:6px;overflow-x:auto;max-width:100%;padding:9px;background:var(--paper);border:1px solid var(--line);border-radius:9px;margin-bottom:38px;scrollbar-width:thin}.mobile-toc a{flex:0 0 auto;padding:6px 9px;font-size:11px;color:var(--muted);white-space:nowrap;text-decoration:none;border-radius:4px}.mobile-toc a.is-current{background:var(--teal-tint);color:var(--teal-deep)}.course-card{grid-template-columns:1fr minmax(250px,.75fr)}.course-card-copy{padding:28px}.course-latest{padding:25px}.catalog-search{min-width:250px}.hero-strip li{padding:0}.strip-text{font-size:11px}}
@media(max-width:760px){.shell{width:calc(100% - 36px)}.header-inner{min-height:68px;gap:12px;flex-wrap:nowrap}.brand{font-size:17px;gap:8px}.brand-mark{width:25px;height:25px}.menu-toggle{display:flex;align-items:center;gap:10px;margin-inline-start:auto}.header-query-link{display:none}.site-nav{display:none}.site-nav.is-open{display:flex;position:absolute;top:61px;inset-inline:0;z-index:105;padding:16px;flex-direction:column;align-items:stretch;background:var(--white);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow-soft)}.site-nav.is-open a{font-size:13px;padding:6px}.hero{padding-top:35px}.hero-grid{grid-template-columns:1fr;gap:30px;padding-bottom:34px}.hero h1{font-size:clamp(40px,9vw,60px);max-width:none;line-height:1.45}.hero-copy{max-width:620px}.hero-lede{font-size:16px;line-height:2;margin-top:20px;max-width:none}.eyebrow{font-size:11px;margin-bottom:18px}.hero-actions{margin-top:24px;gap:14px}.hero-figure{max-width:560px;width:100%;margin-inline:auto;padding:12px}.hero-figure>img{max-height:390px}.hero-strip{display:grid;grid-template-columns:1fr;gap:0}.hero-strip li{padding:14px 0;min-height:0;gap:20px}.hero-strip li+li{padding-inline-start:0;border-inline-start:0;border-top:1px solid var(--line)}.strip-text{font-size:12px}.strip-number{font-size:21px}.catalog-section{padding-block:45px 65px}.catalog-head{display:block;margin-bottom:22px}.catalog-search{margin-top:25px;max-width:none;width:100%;min-width:0}.course-card{grid-template-columns:1fr}.course-card-copy{padding:25px}.course-card h3{font-size:27px}.course-latest{border-inline-start:0;border-top:1px solid var(--line);padding:25px}.course-latest .lesson-number{font-size:28px}.lesson-list-card{padding:22px 20px;gap:15px;grid-template-columns:40px minmax(0,1fr)}.lesson-list-card h3{font-size:19px;line-height:1.85}.lesson-number{font-size:27px}.lesson-list-card p{font-size:12px}.lesson-list-card>.text-link{font-size:12px}.lesson-shell{padding-top:32px}.mobile-toc{top:68px;margin-bottom:32px}.section-head h2{font-size:30px;max-width:none;line-height:1.65}.section-kicker{font-size:10.5px}.lesson-section{margin-bottom:60px}.lesson-prose{font-size:16px;line-height:2.1}.lesson-prose>p{margin-block:19px}.table-card-head{padding:18px}.table-card-head h3{font-size:18px}.table-readout{padding:13px 15px}.code-head{padding:7px 12px}.code-block pre{font-size:12px;padding:16px 14px;line-height:1.85}.code-block{margin-block:22px}.lesson-formula{padding:23px 15px;font-size:1rem;margin-block:24px}.mini-lab{padding:20px 16px}.mini-lab-head{gap:10px}.mini-lab h3{font-size:21px}.lab-kicker{font-size:9px}.quiet-button{font-size:9px;padding:7px 8px}.mini-lab-grid{grid-template-columns:1fr;gap:16px}.example-steps>div{padding:15px 17px}.example-controls{padding:17px}.note{font-size:14px}.teaching-figure{margin-block:23px}.lesson-footer{display:block}.lesson-footer a{display:inline-block;margin-top:10px}.tasks{padding-inline-start:21px}.tasks li{padding-inline-start:5px}.site-footer>.shell{gap:14px}.site-footer p{flex-basis:100%;order:3}}
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@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{body{background:white;font-size:11pt}.site-header,.site-footer,.lesson-rail,.mobile-toc,.hero-actions,.mini-lab,.copy-code,#reading-progress,#toast{display:none!important}.shell{width:100%;max-width:none}.hero-grid{display:block}.hero-figure,.hero-strip{display:none}.hero{padding-top:0}.hero h1{font-size:25pt}.hero-lede{font-size:11pt}.lesson-shell{display:block;padding:0}.section-head h2{font-size:18pt}.lesson-prose{font-size:11pt}.lesson-section{break-inside:auto;margin-bottom:30px}.code-block,.formula-card,.teaching-figure{break-inside:avoid}.code-block pre{white-space:pre-wrap;font-size:8.5pt}.table-scroll{overflow:visible}.dataset-table,.answer{min-width:0}.answer textarea{border:0;min-width:0}.katex{font-size:1em}.lesson-formula{overflow:visible}.breadcrumb{display:none}}