:root{--bg:#f5f5f0;--paper:#fff;--text:#23383a;--muted:#73807e;--line:#e2e6de;--accent:#246b57;--accent-bg:#edf3e8;--nav:#142e30;--nav-text:#b5c7c5;--lime:#deefab;--orange:#b87b40;--shadow:0 16px 55px #1c3c3012;--radius:14px;color-scheme:light;font-family:Inter,"Segoe UI",Arial,sans-serif;font-size:15px}
.mobile-toc{display:none}.search-trigger span,.search-trigger kbd{white-space:nowrap}.search-trigger{width:220px!important}
@media(max-width:1250px){.mobile-toc{display:block;background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin:0 0 23px;font-size:12px}.mobile-toc summary{cursor:pointer;font-weight:600}.mobile-toc a{display:block;padding:6px 0;font-size:11px}.mobile-toc[open] summary{margin-bottom:8px}}
@media(max-width:1000px){.search-trigger{width:38px!important}.search-trigger span,.search-trigger kbd{display:none}}
:root[data-theme=dark]{--bg:#162326;--paper:#1d2d30;--text:#e3eae3;--muted:#a2b3ae;--line:#344447;--accent:#a8d5a9;--accent-bg:#293f34;--nav:#0e2023;--nav-text:#bdcfca;--lime:#daeeb1;color-scheme:dark}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.65}a{color:var(--accent);text-decoration:none}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #78a677;outline-offset:3px}button{color:inherit}button svg{vertical-align:middle}.skip{position:fixed;top:-60px;left:20px;z-index:100;background:var(--paper);padding:12px}.skip:focus{top:10px}.loading{padding:80px;text-align:center}.icon{width:19px;height:19px;flex-shrink:0;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.small-icon{width:15px;height:15px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:42px;letter-spacing:-1.5px;line-height:1.15;margin-bottom:18px;font-weight:700}h2{font-size:25px;letter-spacing:-.65px;line-height:1.3;margin-bottom:15px}h3{font-size:18px;letter-spacing:-.25px;line-height:1.4}p{margin-bottom:16px}.muted{color:var(--muted)}.eyebrow{font-size:11px;letter-spacing:1.5px;font-weight:700;text-transform:uppercase;color:var(--accent);margin-bottom:12px}.tag{font-size:11px;padding:4px 9px;border:1px solid var(--line);border-radius:5px;display:inline-flex;align-items:center;gap:5px;line-height:1.4;background:var(--paper)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:10px 17px;border:1px solid var(--line);border-radius:8px;background:var(--paper);font-size:13px;font-weight:600;min-height:41px;color:var(--text);transition:.16s}.btn:hover{border-color:var(--accent);transform:translateY(-1px)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--paper)}[data-theme=dark] .btn.primary{color:#173527}.btn.soft{background:var(--accent-bg);color:var(--accent);border-color:transparent}.btn.small{font-size:12px;min-height:32px;padding:6px 11px}.btn.icon-only{padding:8px;min-width:38px}.pill{display:inline-flex;border-radius:20px;padding:4px 10px;font-size:11px;background:var(--accent-bg);color:var(--accent);font-weight:600}.row{display:flex;align-items:center;gap:12px}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.divider{height:1px;background:var(--line);margin:24px 0}.sidebar{width:252px;position:fixed;inset:0 auto 0 0;background:var(--nav);color:var(--nav-text);z-index:30;display:flex;flex-direction:column}.brand{height:84px;padding:24px 22px;display:flex;gap:11px;align-items:center;color:#f6f9ee}.brand-mark{display:grid;place-items:center;background:var(--lime);color:#184336;border-radius:9px;width:34px;height:36px;font:italic bold 28px Georgia}.brand strong{font-size:17px;letter-spacing:-.5px;display:block;line-height:1.15}.brand small{font-size:10px;letter-spacing:1.2px;color:#8eaba6;text-transform:uppercase}.side-scroll{overflow-y:auto;padding:0 14px 20px;flex:1;scrollbar-width:thin;scrollbar-color:#46615b transparent}.nav-label{font-size:9px;letter-spacing:1.8px;font-weight:700;color:#73948d;padding:22px 12px 9px}.nav-link{display:flex;align-items:center;gap:10px;color:var(--nav-text);font-size:12px;padding:9px 12px;border-radius:7px;margin:2px 0;transition:.15s}.nav-link:hover{background:#ffffff09;color:#fff}.nav-link.active{color:var(--lime);background:#2b4944}.nav-link.active .icon{color:var(--lime)}.nav-link .count{margin-left:auto;font-size:10px;color:#87a59c}.week-nav{border-radius:6px;margin:3px 0}.week-nav>summary{list-style:none;display:flex;align-items:center;gap:10px;padding:10px 10px;font-size:12px;cursor:pointer;color:#c1d0c9}.week-nav>summary::-webkit-details-marker{display:none}.week-nav>summary:hover{background:#ffffff07}.week-number{display:grid;place-items:center;width:23px;height:23px;border:1px solid #3c5652;border-radius:6px;font-size:10px;color:#99b3a5;flex-shrink:0}.week-nav[open] .chevron{transform:rotate(90deg)}.week-nav .chevron{margin-left:auto;width:12px;height:12px;transition:.2s}.week-nav .lesson-link{font-size:11px;line-height:1.45;margin-left:22px;border-left:1px solid #35514b;padding-left:15px;display:flex;gap:6px;color:#96b1a8;padding-top:7px;padding-bottom:7px}.lesson-link.active{color:var(--lime);border-left:2px solid var(--lime)}.lesson-link:hover{color:white}.lesson-link .done{font-size:10px;color:var(--lime)}.side-foot{border-top:1px solid #2e4945;padding:17px 23px;font-size:11px}.progress-track{height:5px;background:var(--line);border-radius:9px;overflow:hidden}.progress-track span{height:100%;background:var(--accent);display:block;border-radius:9px;transition:width .3s}.side-foot .progress-track{background:#35534c;margin-top:10px}.side-foot .progress-track span{background:var(--lime)}.shell{margin-left:252px}.topbar{height:72px;background:var(--bg);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:0 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a{display:block;color:var(--muted);border-left:1px solid var(--line);padding:7px 0 7px 14px;line-height:1.45}.toc a:hover,.toc a.current{color:var(--accent);border-color:var(--accent)}.toc-note{border-top:1px solid var(--line);margin-top:25px;padding-top:19px;line-height:1.6}.toc-note strong{display:block;font-size:11px;color:var(--text);margin-bottom:7px}.toc .badge{display:inline-block;color:var(--accent);background:var(--accent-bg);font-size:9px;padding:3px 7px;border-radius:4px;margin-bottom:10px}.hero{position:relative;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);overflow:hidden;padding:36px;margin:0 0 24px;min-height:300px}.hero:after{content:'';position:absolute;right:-105px;top:-160px;width:480px;height:480px;border-radius:50%;border:1px solid var(--line);pointer-events:none}.hero-copy{position:relative;z-index:1;max-width:380px}.hero h1{font-size:45px;letter-spacing:-1.8px;margin:12px 0 17px}.hero h1 em{font-style:normal;color:var(--accent)}.hero p{font-size:13px;color:var(--muted);max-width:330px;line-height:1.8}.hero .row{margin-top:23px}.hero-art{position:absolute;right:-15px;bottom:-8px;width:310px;opacity:.95}.hero-art .graph-line{stroke:var(--line)}.hero-art text{fill:var(--muted);font:10px 'Segoe UI',sans-serif}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-bottom:35px}.stat-card{padding:18px 19px;border:1px solid var(--line);border-radius:10px;background:var(--paper);display:flex;align-items:center;gap:13px}.stat-icon{width:36px;height:36px;border-radius:9px;background:var(--accent-bg);display:grid;place-items:center;color:var(--accent)}.stat-card strong{font-size:22px;letter-spacing:-.7px;display:block;line-height:1.25}.stat-card small{font-size:10px;color:var(--muted)}.section-head{margin:35px 0 18px;display:flex;align-items:center;justify-content:space-between;gap:12px}.section-head h2{font-size:21px;margin:0}.section-head 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footer{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:var(--muted);padding-top:13px;border-top:1px solid var(--line)}.week-card footer .icon{color:var(--accent);width:16px}.notice{padding:16px 18px;border:1px solid var(--line);border-radius:10px;font-size:12px;background:var(--accent-bg);display:flex;gap:12px;margin-top:22px}.notice p{margin:0}.notice strong{font-size:12px}.page-head{padding-bottom:25px;border-bottom:1px solid var(--line);margin-bottom:28px}.page-head .lead{font-size:15px;color:var(--muted);line-height:1.85;max-width:720px}.meta-row{display:flex;align-items:center;gap:13px;font-size:11px;color:var(--muted);flex-wrap:wrap;margin:20px 0 0}.meta-row .icon{width:14px;height:14px}.sources-inline{font-size:11px;display:flex;flex-wrap:wrap;gap:7px;margin-top:17px}.sources-inline a{background:var(--accent-bg);padding:4px 8px;border-radius:4px;max-width:100%}.reading-section{scroll-margin-top:95px;margin:34px 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92%,#f1d9ae)}.callout.example{border-left-color:#8e80ab}.callout.note{border-left-color:#829895;background:var(--accent-bg)}.block-label{display:flex;align-items:center;gap:8px;font-size:9px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);margin-bottom:9px}.callout h3{font-size:15px;margin:0 0 10px}.callout .origin{font-size:10px;color:var(--muted);margin:12px 0 0}.callout.proof{padding:0;border-left-color:#7d8998}.callout.proof summary{padding:17px 21px;cursor:pointer;list-style:none;display:flex;align-items:center;gap:10px;font-weight:600}.callout.proof summary .icon{margin-left:auto}.callout.proof[open] summary .icon{transform:rotate(90deg)}.proof-inner{padding:0 23px 22px}.steps{padding:0;counter-reset:step;list-style:none;margin:18px 0 0}.steps li{position:relative;counter-increment:step;padding:0 0 18px 34px}.steps 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var(--line);background:var(--paper);border-radius:13px;padding:27px}.field{margin:15px 0}.field label{display:block;font-size:12px;margin-bottom:7px}.field select{width:100%}.setup-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.result-card{padding:30px;border:1px solid var(--line);background:var(--accent-bg);border-radius:12px;margin-bottom:25px}.result-card strong.big{font-size:40px;color:var(--accent);letter-spacing:-1px}.test-progress{position:sticky;top:72px;z-index:10;padding:14px 18px;background:var(--paper);border:1px solid var(--line);border-radius:9px;font-size:12px;display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.page-footer{margin-top:55px;font-size:10px;color:var(--muted);padding-top:18px;border-top:1px solid var(--line);display:flex;gap:12px;justify-content:space-between}.modal-overlay{position:fixed;inset:0;z-index:70;background:#10252580;backdrop-filter:blur(5px);padding:12vh 20px 30px;display:flex;justify-content:center;align-items:start}.search-modal{background:var(--paper);border:1px solid var(--line);box-shadow:0 25px 100px #0004;border-radius:14px;width:650px;max-width:100%;overflow:hidden;max-height:75vh;display:flex;flex-direction:column}.search-input-row{padding:16px 20px;display:flex;gap:12px;align-items:center;border-bottom:1px solid var(--line)}.search-input-row input{border:0;background:transparent;outline:0;color:var(--text);width:100%;font-size:15px}.search-results{overflow-y:auto;padding:10px}.search-result{display:block;color:var(--text);padding:12px 14px;border-radius:7px}.search-result:hover{background:var(--accent-bg)}.search-result strong{font-size:13px;display:block}.search-result small{font-size:10px;color:var(--muted)}.search-empty{padding:25px;color:var(--muted);font-size:13px}.modal-foot{padding:10px 23px;font-size:10px;color:var(--muted);border-top:1px solid var(--line)}#toast{position:fixed;right:25px;bottom:25px;background:var(--nav);color:var(--lime);padding:11px 19px;border-radius:9px;font-size:12px;z-index:100;opacity:0;transform:translateY(15px);transition:.25s;pointer-events:none}#toast.show{opacity:1;transform:translateY(0)}.mobile-backdrop{display:none}.empty{padding:35px;background:var(--paper);border:1px dashed var(--line);border-radius:10px;color:var(--muted);font-size:13px}.score-ring{width:80px;height:80px;border-radius:50%;background:conic-gradient(var(--accent) calc(var(--p)*1%),var(--line) 0);display:grid;place-items:center}.score-ring span{width:65px;height:65px;background:var(--paper);display:grid;place-items:center;border-radius:50%;font-size:20px;font-weight:600}.progress-item{display:flex;align-items:center;gap:20px;padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px;margin:10px 0}.progress-item .info{flex:1}.progress-item h3{font-size:14px;margin:0 0 7px}.print-only{display:none}
@media(min-width:1600px){.layout{padding-top:47px;gap:55px;grid-template-columns:minmax(0,1fr) 210px}.hero{padding:43px}.hero-art{width:370px}.hero{min-height:325px}.hero-copy{max-width:440px}.hero h1{font-size:51px}}
@media(max-width:1250px){.layout{grid-template-columns:minmax(0,1fr);padding:28px}.toc{display:none}.hero-art{width:290px;right:0}.hero-copy{max-width:350px}.hero h1{font-size:42px}.topbar{padding:0 28px}}
@media(max-width:1000px){.sidebar{width:225px}.shell{margin-left:225px}.hero-art{opacity:.25;width:300px}.hero-copy{max-width:100%}.hero{padding:28px}.hero h1{font-size:40px}.hero p{max-width:350px}.search-trigger{width:150px}.search-trigger kbd{display:none}.topbar{padding:0 22px}.stat-card{padding:15px 12px}.stat-icon{display:none}.week-card{padding:18px}.layout{padding:25px 22px}.breadcrumb{font-size:11px}}
@media(max-width:760px){.sidebar{transform:translateX(-100%);width:270px;transition:.25s}.shell{margin-left:0}.nav-open .sidebar{transform:translateX(0)}.nav-open .mobile-backdrop{display:block;position:fixed;inset:0;background:#10252580;z-index:29}.mobile-toggle{display:inline-flex}.topbar{height:61px;padding:0 17px;gap:10px}.breadcrumb{flex:1}.breadcrumb .crumb-home{display:none}.search-trigger{width:35px;border:0;background:transparent;padding:7px}.search-trigger span{display:none}.header-actions{gap:2px}.layout{padding:23px 18px 45px}.hero{padding:26px;min-height:300px}.hero h1{font-size:38px;max-width:330px}.hero-art{width:280px;right:-55px;opacity:.18}.hero .eyebrow{font-size:9px}.hero .row{gap:8px}.hero .btn{font-size:11px;padding:9px 12px}.stat-grid{gap:9px;margin-bottom:27px}.stat-card{padding:14px 11px}.stat-card strong{font-size:20px}.stat-card small{font-size:9px}.week-grid{gap:12px}.week-card{padding:18px}.week-card h3{font-size:15px}.week-card p{font-size:11px}.week-card footer{font-size:9px}.section-head h2{font-size:20px}h1{font-size:32px;letter-spacing:-1px}.page-head .lead{font-size:14px}.reading-section>h2{font-size:22px}.callout{padding:18px 17px}.quiz-card,.exercise-card{padding:19px 16px}.lab-body{padding:18px}.lab-controls{gap:13px}.lab-head{padding:14px 17px}.source-grid{grid-template-columns:1fr}.setup-grid{grid-template-columns:1fr;gap:0}.test-progress{top:61px}.page-footer{flex-direction:column}.lesson-footer{gap:9px}.lesson-footer a{padding:12px}.modal-overlay{padding-top:8vh}.search-modal{max-height:82vh}.reading-section{scroll-margin-top:80px}.hero .row .btn .icon{width:15px}}
@media(max-width:450px){.week-grid{grid-template-columns:1fr}.week-card p{margin-bottom:14px}.hero{padding:23px}.hero h1{font-size:36px}.hero .row{flex-wrap:wrap}.lab-controls{grid-template-columns:1fr}.door{width:78px;height:110px}.door-grid{gap:12px}.stat-card small{font-size:8px}.stat-card strong{font-size:19px}.tag{font-size:10px}.lab-head small{display:none}}
@media print{.sidebar,.topbar,.toc,.btn,.lab-controls,.exercise-actions,.page-footer,.lesson-footer{display:none!important}.shell{margin:0}.layout{display:block;padding:0}.callout,.quiz-card,.exercise-card{break-inside:avoid}.hero{background:none}.print-only{display:block}.katex-display{overflow:visible!important}body{background:white;color:#111;font-size:11pt}.content{max-width:none}}