:root{color-scheme:light;--paper:#f8f8f3;--surface:#fff;--ink:#17333a;--muted:#52676a;--line:#dbe2dd;--orange:#b64a27;--orange-light:#f9ede4;--teal:#1f6266;--green:#267044;--red:#a73531;--serif:Georgia,'Times New Roman',serif;--sans:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-family:var(--sans);color:var(--ink);background:var(--paper);font-size:16px;scroll-behavior:smooth;scroll-padding-top:110px}
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/* A quiet reading workspace. */
.lesson-layout{display:grid;grid-template-columns:244px minmax(0,760px) 210px;gap:42px;max-width:1430px;margin-inline:auto;padding:0 24px}.lesson-sidebar{position:sticky;top:0;height:100vh;overflow:auto;overscroll-behavior:contain;padding:27px 20px 50px 0;border-right:1px solid var(--line);scrollbar-width:thin}.back-link{font-size:11px;text-decoration:none}.sidebar-label{font-size:9px;letter-spacing:.12em;color:var(--muted);margin:30px 0 18px}.lesson-sidebar details{border-top:1px solid var(--line);padding:14px 0 11px}.lesson-sidebar summary{font-size:11px;font-weight:600;line-height:1.55;cursor:pointer}.lesson-sidebar summary small{font-weight:400;font-size:10px;color:var(--muted);float:right;margin-right:5px}.lesson-sidebar ol{padding:9px 0 0;list-style:none;margin:0}.lesson-sidebar li a{display:flex;gap:8px;align-items:baseline;padding:7px 8px;font-size:10px;line-height:1.6;text-decoration:none;border-radius:4px}.lesson-sidebar li a>span{font-size:9px;color:#768e87}.lesson-sidebar 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ul{font-size:13px;line-height:1.8;color:var(--muted);padding-left:19px;margin:10px 0 0}.lesson-jumps{display:flex;gap:25px;flex-wrap:wrap;border-block:1px solid var(--line);padding:15px 0;margin:25px 0 42px;font-size:11px}.lesson-jumps a{text-decoration:none}.lesson-jumps a:hover{color:var(--orange)}.lesson-section{margin-bottom:39px;scroll-margin-top:25px}.chapter h2{font-family:var(--serif);font-size:29px;line-height:1.25;letter-spacing:-.025em;margin:37px 0 22px}.chapter h3{font-size:18px;line-height:1.4;margin:25px 0 16px;font-weight:600}.chapter .section-number{font-family:var(--sans);font-size:10px;letter-spacing:0;color:var(--orange);display:block;margin-bottom:10px;font-weight:650}.chapter p,.chapter li{font-size:15px;line-height:1.85}.chapter p{margin-bottom:18px}.chapter ul,.chapter ol{padding-left:23px;margin-bottom:22px}.chapter li{padding-left:3px;margin-bottom:8px}.chapter strong{font-weight:650}.chapter code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;background:#eaf0e7;padding:2px 5px;border-radius:3px;font-size:.83em;overflow-wrap:anywhere}.chapter pre{background:#15363c;color:#ecf1e7;padding:20px;border-radius:7px;overflow:auto;line-height:1.7;font-size:12px}.chapter pre code{background:transparent;color:inherit;padding:0;overflow-wrap:normal}.chapter table{border-collapse:collapse;width:100%;font-size:12px;line-height:1.75;display:block;overflow:auto;margin:25px 0}.chapter th,.chapter td{text-align:left;padding:12px 13px;border-bottom:1px solid var(--line);vertical-align:top;min-width:90px}.chapter th{font-weight:650;background:#eaf0e7;white-space:nowrap}.chapter blockquote{margin:25px 0;padding:15px 22px;border-left:3px solid #b08447;background:#faf1df}.chapter blockquote p{margin:0}.lesson-toc{position:sticky;top:25px;align-self:start;padding:35px 0}.outline-title{font-size:9px;letter-spacing:.12em;margin-bottom:16px}.outline-title a{text-decoration:none}.chapter-toc{display:flex;flex-direction:column;gap:11px;border-left:1px solid var(--line)}.chapter-toc a{font-size:10px;line-height:1.6;text-decoration:none;color:var(--muted);padding-left:13px;border-left:2px solid transparent;margin-left:-1px}.chapter-toc a.active{color:var(--orange);border-left-color:var(--orange)}.chapter-budget{margin-top:30px;border-top:1px solid var(--line);padding-top:20px;font-size:10px;color:var(--muted)}.chapter-budget strong{display:block;color:var(--ink);font-weight:600;margin-bottom:13px}.chapter-budget>div{display:flex;justify-content:space-between;gap:15px;margin-bottom:9px;font-size:9px;line-height:1.5}.course-figure{container:course-diagram / inline-size;min-width:0;border:1px solid #cad8cf;border-radius:8px;background:#f0f4ed;padding:20px;margin:35px 0 45px}.figure-heading{display:flex;align-items:start;justify-content:space-between;gap:18px;min-width:0}.chapter .figure-heading h3{font-family:var(--sans);font-size:12px;letter-spacing:0;font-weight:600;margin:0;line-height:1.5;min-width:0;overflow-wrap:anywhere}.expand-diagram{background:transparent;border:0;font-size:10px;white-space:nowrap;padding:3px 0}.diagram-expanded{container:course-diagram / inline-size;min-width:0}.diagram-scroll{container:course-diagram / inline-size;min-width:0;margin-block:10px 0}.diagram-variants{min-width:0}.diagram-scroll svg,.diagram-expanded svg{display:block;width:100%;height:auto}.diagram-edge path{fill:none;stroke:#3e6470;stroke-width:2}.diagram-edge-label rect{stroke:#89aaa0;stroke-width:1.5}.edge-label{fill:#36565d;font:15px var(--sans);text-anchor:middle}.diagram-node>rect{fill:white;stroke:#89aaa0;stroke-width:1.5}.node-label{fill:#17333a;font:600 19px var(--sans);text-anchor:middle}.node-detail{fill:#52676a;font:14px var(--sans);text-anchor:middle}.course-figure figcaption{font-size:12px;line-height:1.75;color:var(--muted);margin-top:13px}.diagram-transcript{border-top:1px solid #d3dfd2;margin-top:17px;padding-top:12px}.diagram-transcript summary{font-size:11px;cursor:pointer}.chapter .diagram-transcript ol{margin:15px 0 0;padding-left:20px}.chapter .diagram-transcript li{font-size:12px;line-height:1.75}.exercise-section{background:#ebf0e5;border-radius:8px;padding:30px 28px;margin:45px 0}.chapter .exercise-section h2{margin:0 0 10px;font-size:30px}.chapter .exercise-time{font-size:10px;color:var(--muted);margin-bottom:23px}.lab-checks{padding-block:20px;margin-top:15px;border-top:1px solid #cbd6c5}.lab-checks>strong{display:block;font-size:12px;margin-bottom:14px}.lab-checks label{display:flex;gap:11px;align-items:start;margin:12px 0;font-size:12px;line-height:1.7;cursor:pointer}.lab-checks input{margin-top:4px;accent-color:var(--teal);width:16px;height:16px;flex-shrink:0}.worked-solution{border-top:1px solid #cbd6c5;border-bottom:1px solid #cbd6c5;padding:17px 0}.worked-solution summary{cursor:pointer;font-size:12px;font-weight:600}.worked-solution>div{padding-top:20px}.chapter .small-note,.small-note{font-size:11px!important;line-height:1.8!important;color:var(--muted);margin-top:17px}.cards-section{margin:55px 0}.cards-section h2,.quiz-section h2{margin-top:0}.inline-cards{display:grid;gap:12px;margin:25px 0}.inline-cards details{background:var(--surface);border:1px solid #cbd7ce;border-radius:6px;padding:21px}.inline-cards summary{font-family:var(--serif);font-size:20px;line-height:1.4;cursor:pointer;list-style:none}.inline-cards summary::after{content:' +';float:right;font:20px var(--sans);color:var(--teal)}.inline-cards details[open] summary::after{content:' −'}.inline-cards summary>span{display:block;font:9px var(--sans);letter-spacing:.12em;color:var(--orange);margin-bottom:11px}.chapter .inline-cards p{font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:17px;margin:18px 0 0}.quiz-section{margin:55px 0 35px;padding-top:25px;border-top:1px solid var(--line)}.quiz-section fieldset{border:0;padding:0;margin:32px 0 38px;min-width:0}.quiz-section legend{font-family:var(--serif);font-size:21px;line-height:1.5;margin-bottom:19px;width:100%}.quiz-section legend>span{display:block;font:9px var(--sans);color:var(--orange);letter-spacing:.1em;margin-bottom:10px}.quiz-option{display:flex;gap:11px;align-items:center;background:#fff;border:1px solid #d1dbd1;border-radius:5px;padding:14px;margin:9px 0;cursor:pointer;font-size:13px;line-height:1.65}.quiz-option:hover{background:#eef2e9}.quiz-option:has(input:checked){border-color:var(--teal);background:#ebf2e9}.quiz-option input{flex-shrink:0;accent-color:var(--teal);margin:0;width:16px;height:16px}.option-letter{font-size:10px;font-weight:600;color:var(--muted)}.quiz-option.correct-option{border-color:#5b9267;background:#eaf4e9}.quiz-option.wrong-option{border-color:#bd7165;background:#f9edeb}.answer-badge{margin-left:auto;flex-shrink:0;font-size:9px;font-weight:600;color:var(--green)}.answer-explanation{background:#edf2e8;border-left:3px solid var(--green);padding:18px 20px;margin-top:16px;font-size:12px}.incorrect .answer-explanation{border-color:var(--red);background:#f7eeeb}.chapter .answer-explanation p{font-size:13px;line-height:1.8;margin:9px 0}.answer-explanation a{font-size:11px}.quiz-actions{display:flex;align-items:center;gap:25px}.quiz-actions>span{font-size:11px;color:var(--muted)}.quiz-result{background:var(--ink);color:white;padding:30px;border-radius:7px;margin:30px 0 20px}.chapter .quiz-result strong{font-family:var(--serif);font-size:40px;font-weight:400;display:block;margin-block:14px}.chapter .quiz-result .eyebrow{color:#e5bb88;margin:0;font-size:9px!important}.chapter .quiz-result p{font-size:13px;line-height:1.8;margin:0}.chapter-finish{border-block:1px solid var(--line);margin:40px 0;padding:30px 0}.chapter-finish h2{margin:0 0 15px}.chapter-finish .eyebrow{margin-bottom:16px}.chapter-finish #completion-note{font-size:11px;color:var(--teal);margin:13px 0 0}.course-references{font-size:12px;color:var(--muted)}.chapter .course-references h2{font-family:var(--sans);font-size:12px;letter-spacing:0;font-weight:600}.chapter .course-references li{font-size:12px;line-height:1.7}.chapter-pagination{display:flex;justify-content:space-between;gap:40px;margin:40px 0 70px;border-top:1px solid var(--line);padding-top:25px}.chapter-pagination a{text-decoration:none;max-width:47%;font-size:14px;line-height:1.5}.chapter-pagination a:last-child{text-align:right}.chapter-pagination 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/* Deliberate revision and transparent progress. */
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