@font-face{font-family:Sorts Mill Goudy;src:url(/fonts/league/sorts-mill-goudy/OFLGoudyStM.otf)format("opentype");font-weight:400;font-style:normal;font-display:optional}@font-face{font-family:Sorts Mill Goudy;src:url(/fonts/league/sorts-mill-goudy/OFLGoudyStM-Italic.otf)format("opentype");font-weight:400;font-style:italic;font-display:optional}@font-face{font-family:League Spartan;src:url(/fonts/league/league-spartan/LeagueSpartan%5Bwght%5D.ttf)format("truetype");font-weight:100 900;font-style:normal;font-display:optional}:root{--accent:#185b46;--secondary:#a7bfa8;--logo-overlap:#10442e;--paper:#fbfaf6;--surface:#fff;--ink:#172e25;--muted:#626d60;--line:#d8dcd0;--control-border:#7a887c;--soft:#e5ebe1;--inverse:#fbfaf6;--accent-hover:#124b39;--accent-active:#0d382c;--selected-bg:#dceee4;--selected-fg:#153e2d;--disabled-bg:#e9eae3;--disabled-fg:#697267;--success:#1e6241;--success-bg:#e4f1e7;--success-border:#438457;--error:#973e37;--error-bg:#faeae7;--error-border:#b65b50;--warning:#78521b;--warning-bg:#fbf0d5;--info:#2e5f7e;--info-bg:#e7f0f5;--highlight:#f2e2b6;--focus:#805a20;--display:"Sorts Mill Goudy",serif;--reading:"Sorts Mill Goudy",serif;--ui:"League Spartan",sans-serif;--content:1320px;--reading-width:720px;--gutter:48px;--radius:10px}*{box-sizing:border-box}html{scroll-behavior:smooth;color-scheme:light}body{background:var(--paper);color:var(--ink);font:400 18px/1.5 var(--reading);font-feature-settings:"kern" 1,"liga" 1,"lnum" 1;margin:0}a{color:var(--accent);text-underline-offset:3px}a:hover{color:var(--accent-hover)}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}:is(button,a,input,summary):focus-visible{outline:3px solid var(--focus);outline-offset:4px}::selection{background:var(--highlight);color:#55401d}[hidden]{display:none!important}.skip-link{z-index:50;background:var(--accent-active);color:#fff;font:15px/1.4 var(--ui);padding:10px 14px;position:fixed;top:-80px;left:16px}.skip-link:focus{top:12px}.site-header,.site-footer,.course-main{width:min(var(--content),calc(100% - (var(--gutter) * 2)));margin-inline:auto}.site-header{border-bottom:1px solid var(--line);font-family:var(--ui);justify-content:space-between;align-items:center;gap:30px;padding:29px 0 28px;display:flex}.brand{color:var(--ink);font:400 29px/1 var(--display);letter-spacing:-.025em;white-space:nowrap;align-items:center;gap:11px;text-decoration:none;display:inline-flex}.logo-mark{aspect-ratio:40/34;flex:none;width:38px;height:auto;display:block}.site-header nav{align-items:center;gap:28px;font-size:15px;display:flex}.site-header nav a{color:var(--ink);padding:8px 0;text-decoration:none}.site-header nav a[aria-current=page]{color:var(--accent)}.site-header nav .nav-action{border-bottom:1px solid var(--ink)}.site-footer{border-top:1px solid var(--line);color:var(--muted);font:13px/1.6 var(--ui);justify-content:space-between;gap:24px;padding:26px 0;display:flex}.eyebrow{color:var(--muted);font:400 13px/1.5 var(--ui);letter-spacing:.12em;text-transform:uppercase;margin:0 0 22px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:var(--display);font-weight:400}.course-hero{grid-template-columns:1.12fr 1fr;align-items:center;gap:54px;padding:72px 0;display:grid}.course-hero h1{font:400 clamp(54px,7.2vw,96px)/1.01 var(--display);letter-spacing:-.045em;margin:0 0 28px}.course-hero h1 em{color:var(--accent);font-weight:400}.hero-dek{max-width:500px;color:var(--muted);font:400 19px/1.5 var(--ui);margin-bottom:30px}.hero-actions{flex-wrap:wrap;align-items:center;gap:25px;display:flex}.primary-action{border:1px solid var(--accent);border-radius:var(--radius);background:var(--accent);color:#fff;min-height:52px;font:400 15px/1.3 var(--ui);justify-content:space-between;align-items:center;gap:30px;padding:16px 22px;text-decoration:none;display:inline-flex}.primary-action:hover{background:var(--accent-hover);color:#fff}.primary-action:active{background:var(--accent-active)}.text-action{border-bottom:1px solid var(--line);color:var(--ink);font:400 15px/1.3 var(--ui);padding:11px 0;text-decoration:none}.hero-note{color:var(--muted);font:13px/1.5 var(--ui);margin:18px 0 0}.lesson-specimen{border-radius:var(--radius);background:var(--soft);padding:30px}.specimen-top,.specimen-bottom{color:var(--muted);font:13px/1.5 var(--ui);justify-content:space-between;gap:18px;display:flex}.specimen-top{border-top:3px solid var(--secondary);border-bottom:1px solid var(--line);margin-bottom:30px;padding:14px 0 20px}.lesson-specimen h2{font:400 clamp(30px,3.5vw,40px)/1.15 var(--display);letter-spacing:-.035em;margin-bottom:28px}.exchange-flow{grid-template-columns:1fr auto 1fr;align-items:center;gap:0;margin:32px 0 0;display:grid}.flow-node{border:1px solid var(--ink);border-radius:var(--radius);background:var(--paper);text-align:center;padding:20px 10px}.flow-node strong{font:400 15px/1.3 var(--ui);margin-bottom:7px;display:block}.flow-node span{color:var(--muted);font:12px/1.4 var(--ui)}.flow-arrow{width:50px;color:var(--accent);font:28px/1 var(--ui);text-align:center}.flow-caption{color:var(--muted);text-align:center;margin:15px 0 0;font:12px/1.5 ui-monospace,monospace}.specimen-note{max-width:34ch;font:18px/1.5 var(--reading);margin:27px 0 34px}.specimen-bottom{align-items:center}.specimen-bottom a{font-size:15px;text-decoration:underline}.learning-method{border-top:1px solid var(--line);border-bottom:1px solid var(--line);grid-template-columns:repeat(3,1fr);gap:32px;padding:36px 0;display:grid}.learning-method article{grid-template-columns:28px 1fr;gap:12px;display:grid}.learning-method article>span{color:var(--accent);font:13px/1.8 ui-monospace,monospace}.learning-method h2{margin-bottom:9px;font-size:23px;line-height:1.15}.learning-method p{color:var(--muted);font:15px/1.6 var(--ui);margin:0}.course-outline{padding:48px 0 68px}.section-heading{justify-content:space-between;align-items:end;gap:40px;margin-bottom:36px;display:flex}.section-heading h2{letter-spacing:-.03em;margin:0;font-size:clamp(32px,4vw,48px);line-height:1.08}.course-progress{width:220px;color:var(--muted);font:13px/1.4 var(--ui);flex:none}.course-progress strong{color:var(--ink);font:400 26px/1.1 var(--display);display:block}.progress-track{background:var(--line);border-radius:6px;height:6px;margin-top:12px;overflow:hidden}.progress-track span{background:var(--accent);height:100%;display:block}.course-module{border-top:1px solid var(--line);grid-template-columns:minmax(180px,1fr) 2fr;gap:48px;padding:37px 0;display:grid}.module-heading>p:first-child{color:var(--accent);font:12px/1.5 var(--ui);letter-spacing:.08em;text-transform:uppercase;margin-bottom:12px}.module-heading h3{margin-bottom:8px;font-size:28px;line-height:1.12}.module-heading>p:last-child{max-width:32ch;color:var(--muted);margin:0;font-size:16px}.lesson-list{border-top:1px solid var(--line)}.lesson-card{border-bottom:1px solid var(--line);color:var(--ink);grid-template-columns:44px 1fr 105px;align-items:center;gap:18px;padding:18px 4px;text-decoration:none;transition:padding .18s,background .18s;display:grid}.lesson-card:hover{color:var(--ink);background:#ffffffa6;padding-inline:12px}.lesson-number{color:var(--muted);font:12px ui-monospace,monospace}.lesson-copy{gap:3px;display:grid}.lesson-copy strong{font:400 17px/1.35 var(--ui)}.lesson-copy>span:last-child{color:var(--muted);font-size:15px}.lesson-card-meta{color:var(--accent);font:11px/1.4 var(--ui);letter-spacing:.07em;text-transform:uppercase}.lesson-state{color:var(--accent);font:13px/1.3 var(--ui);justify-self:end}.lesson-main{grid-template-columns:160px minmax(0,var(--reading-width));width:min(var(--content),calc(100% - (var(--gutter) * 2)));justify-content:center;gap:48px;margin:auto;padding:48px 0 72px;display:grid}.lesson-body{min-width:0}.lesson-rail{color:var(--muted);font:12px/1.6 var(--ui);align-self:start;padding-top:3px;position:sticky;top:24px}.lesson-rail>p{letter-spacing:.06em}.lesson-rail ol{margin:28px 0 46px;padding:0;list-style:none}.lesson-rail li{border-bottom:1px solid var(--line);padding:9px 0}.lesson-rail a{color:var(--ink);text-decoration:none}.lesson-rail a:hover{color:var(--accent)}.rail-source{border-top:1px solid var(--line);padding-top:17px}.rail-source p{letter-spacing:.06em;margin:0 0 8px}.rail-source p:last-child{color:var(--muted);margin-top:16px}.lesson-progress{background:var(--soft);height:4px;margin-bottom:46px;overflow:hidden}.lesson-progress span{background:var(--accent);height:100%;display:block}.lesson-hero{padding-bottom:16px}.lesson-hero h1{max-width:700px;font:400 clamp(44px,5.6vw,68px)/1.01 var(--display);letter-spacing:-.045em;margin:0 0 22px}.lesson-hero .objective{max-width:650px;font:18px/1.5 var(--reading);margin:0}.lesson-hero .objective span{color:var(--accent);font:12px/1.4 var(--ui);letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px;display:block}.tco-trigger,.glossary-term{color:inherit;cursor:help;background:0 0;border:0;border-bottom:1px dotted;margin:0;padding:0}.tco-trigger{font:inherit;letter-spacing:inherit;text-transform:inherit}.glossary-term{font:inherit}.lesson-content{padding-top:4px}.content-block{margin:38px 0}.content-block h2,.practice>h2,.retrieval h2{font:400 29px/1.18 var(--display);letter-spacing:-.02em;margin-bottom:10px}.content-block p,.practice-intro,.retrieval>p:not(.eyebrow){color:#334a40;font:18px/1.5 var(--reading)}.concept-grid{grid-template-columns:repeat(3,1fr);gap:22px;margin:32px 0;display:grid}.concept-grid article{border-top:3px solid var(--secondary);padding:19px 0}.concept-index{color:var(--accent);font:12px/1.4 var(--ui)}.concept-grid h3{font:400 21px/1.2 var(--display);margin:8px 0 7px}.concept-grid p{color:var(--muted);margin:0;font-size:15px}.diagram{border-radius:var(--radius);background:var(--soft);margin:38px 0;padding:28px;overflow-x:auto}.diagram figcaption{color:var(--muted);font:13px/1.5 var(--ui);letter-spacing:.1em;text-transform:uppercase;margin-bottom:20px}.diagram-svg{min-width:420px;font-family:var(--ui);justify-content:center;display:flex}.diagram-svg svg{width:100%;height:auto}.diagram-error{border:1px solid var(--error-border)}.sr-only{clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important;width:1px!important;height:1px!important;margin:-1px!important;padding:0!important;position:absolute!important;overflow:hidden!important}.callout{border-left:3px solid var(--accent);background:var(--soft);grid-template-columns:34px 1fr;gap:15px;margin:32px 0;padding:24px;display:grid}.callout-icon{background:var(--accent);color:#fff;width:30px;height:30px;font:15px/1 var(--ui);border-radius:50%;place-items:center;display:grid}.callout h3{margin-bottom:4px;font-size:21px}.callout p{color:#354941;margin:0}.config-card,.worked-example,.question{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);margin:34px 0}.config-card{overflow:hidden}.config-top{background:var(--ink);color:var(--inverse);font:12px/1.4 var(--ui);letter-spacing:.08em;text-transform:uppercase;justify-content:space-between;padding:14px 18px;display:flex}.config-row{border-bottom:1px solid var(--line);grid-template-columns:220px 1fr;gap:24px;padding:17px 18px;display:grid}.config-row:last-child{border:0}.config-row div span,.config-row div strong{font-family:var(--ui);display:block}.config-row div span{color:var(--muted);font-size:12px}.config-row div strong{margin-top:3px;font-size:15px}.config-row p{color:var(--muted);margin:0;font-size:15px}.sequence{margin:32px 0;padding:0;list-style:none}.sequence li{border-bottom:1px solid var(--line);grid-template-columns:36px 1fr;gap:17px;padding:18px 0;display:grid}.sequence li>span,.worked-example li>span{background:var(--accent);color:#fff;width:32px;height:32px;font:13px/1 var(--ui);border-radius:50%;place-items:center;display:grid}.sequence h3,.worked-example li h3{font:400 18px/1.3 var(--ui);margin:0 0 3px}.sequence p,.worked-example li p{color:var(--muted);margin:0}.worked-example{padding:28px}.worked-example>h2{margin-bottom:9px;font-size:28px}.worked-scenario{color:#334a40}.worked-example ol{margin:24px 0;padding:0;list-style:none}.worked-example li{border-top:1px solid var(--line);grid-template-columns:34px 1fr;gap:14px;padding:14px 0;display:grid}.worked-result{border-left:3px solid var(--warning);background:var(--warning-bg);color:#514521;margin:0;padding:16px 18px}.worked-result strong{font-family:var(--ui);font-weight:500}.comparison{margin:40px 0}.comparison>h2,.exercise h2{margin-bottom:8px;font-size:27px}.comparison>p{color:var(--muted)}.comparison>div{grid-template-columns:1fr 1fr;gap:14px;display:grid}.comparison article{border-top:3px solid var(--secondary);background:var(--soft);padding:20px}.comparison h3{font:400 18px/1.3 var(--ui);margin-bottom:10px}.comparison ul{color:#46544d;margin:0;padding-left:18px;font-size:16px}.comparison li{margin-bottom:6px}.exercise{border:1px solid var(--accent);border-radius:var(--radius);background:#f8fbf8;margin:40px 0;padding:26px}.exercise-hint{color:var(--muted);margin:16px 0 0}.exercise-hint strong{font-family:var(--ui);font-weight:500}.exercise-reveal,.reveal-answer,.submit-answer{border:1px solid var(--accent);border-radius:var(--radius);background:var(--accent);color:#fff;font:15px/1.3 var(--ui);cursor:pointer;margin-top:16px;padding:14px 18px}.exercise-reveal:hover,.reveal-answer:hover,.submit-answer:hover:not(:disabled){background:var(--accent-hover)}.exercise-answer{border-top:1px solid var(--line);margin-top:18px;padding-top:18px}.exercise-answer p{margin:0}.practice{border-top:1px solid var(--line);margin:56px 0;padding-top:40px}.practice-intro{color:var(--muted)}.question{padding:28px}.question-meta{color:var(--muted);font:12px/1.4 var(--ui);letter-spacing:.08em;text-transform:uppercase;justify-content:space-between;gap:18px;margin-bottom:16px;display:flex}.question h3{font:400 20px/1.5 var(--reading);margin-bottom:20px}.option-list{gap:10px;display:grid}.option{border:1px solid var(--control-border);border-radius:var(--radius);background:var(--surface);width:100%;color:var(--ink);font:15px/1.5 var(--ui);text-align:left;cursor:pointer;grid-template-columns:28px 1fr;align-items:center;gap:12px;padding:15px 16px;display:grid}.option>span:first-child{border:1px solid var(--line);width:24px;height:24px;color:var(--muted);border-radius:50%;place-items:center;font-size:12px;display:grid}.option:hover:not(:disabled){border-color:var(--accent)}.option.selected{border-color:var(--accent);background:var(--selected-bg);color:var(--selected-fg)}.option.correct{border-color:var(--success-border);background:var(--success-bg)}.option.wrong{border-color:var(--error-border);background:var(--error-bg)}.option:disabled{opacity:1;cursor:default}.submit-answer:disabled{border-color:var(--line);background:var(--disabled-bg);color:var(--disabled-fg);cursor:not-allowed}.question-feedback{border:1px solid var(--success-border);border-radius:var(--radius);background:var(--success-bg);color:var(--success);margin-top:18px;padding:17px 18px}.question-feedback.wrong{border-color:var(--error-border);background:var(--error-bg);color:var(--error)}.question-feedback strong{font:400 15px/1.4 var(--ui)}.question-feedback p{color:inherit;margin:5px 0 0}.lesson-complete{border:1px solid var(--success-border);border-radius:var(--radius);background:var(--success-bg);grid-template-columns:38px 1fr;align-items:center;gap:14px;margin-top:24px;padding:18px;display:grid}.lesson-complete>span{background:var(--success);color:#fff;width:34px;height:34px;font-family:var(--ui);border-radius:50%;place-items:center;display:grid}.lesson-complete strong{font:400 15px/1.4 var(--ui)}.lesson-complete p{color:var(--muted);margin:0}.retrieval{border-top:3px solid var(--secondary);background:var(--soft);margin:54px 0;padding:28px}.retrieval #retrieval-answer{border-top:1px solid var(--line);margin-top:20px;padding-top:20px}.retrieval #retrieval-answer p{margin:0}.reading{border-block:1px solid var(--line);grid-template-columns:1fr 1.2fr;align-items:center;gap:30px;margin:48px 0 28px;padding:24px 0;display:grid}.reading h2{margin:0;font-size:25px}.reading>a{font:15px/1.5 var(--ui)}.sources{color:var(--muted);font-size:16px}.sources summary{color:var(--accent);font:400 15px/1.5 var(--ui);cursor:pointer}.sources li{margin-bottom:8px}.sources li span{display:block}.lesson-glossary{margin-top:14px}.lesson-glossary dl{margin:12px 0 0}.lesson-glossary dl div{border-bottom:1px solid var(--line);grid-template-columns:180px 1fr;gap:18px;padding:11px 0;display:grid}.lesson-glossary dt{color:var(--ink);font:400 15px/1.4 var(--ui)}.lesson-glossary dt span{color:var(--accent);margin-top:2px;font-size:12px;display:block}.lesson-glossary dd{margin:0}.lesson-nav{grid-template-columns:1fr 1fr;gap:16px;margin:50px 0 10px;display:grid}.lesson-nav a{border-top:1px solid var(--line);color:var(--ink);padding:18px;text-decoration:none;display:grid}.lesson-nav a:hover{border-color:var(--accent)}.lesson-nav a.next{text-align:right}.lesson-nav span{color:var(--accent);font:12px/1.4 var(--ui);text-transform:uppercase}.lesson-nav strong{font:400 15px/1.4 var(--ui);margin-top:4px}.term-popover{z-index:30;border:1px solid var(--accent);border-radius:var(--radius);background:var(--surface);max-height:min(420px,100vh - 24px);padding:22px 42px 20px 22px;position:fixed;overflow:auto;box-shadow:0 20px 60px #172e2533}.term-popover h2{margin:0 0 8px;font-size:23px}.term-popover>p:not(.eyebrow){color:#425149;white-space:pre-line;margin-bottom:14px;font-size:16px}.term-popover-expansion{color:var(--accent)!important;font:13px/1.4 var(--ui)!important}.term-popover>a{font:13px/1.4 var(--ui)}.term-popover-close{background:var(--soft);width:28px;height:28px;color:var(--muted);font:18px/1 var(--ui);cursor:pointer;border:0;border-radius:50%;padding:0;position:absolute;top:9px;right:11px}.reference-main{width:min(900px,calc(100% - (var(--gutter) * 2)));margin:auto}.reference-hero{padding:70px 0 46px}.reference-hero h1{font:400 clamp(48px,7vw,72px)/1 var(--display);letter-spacing:-.04em;margin-bottom:13px}.reference-hero>p:last-child{max-width:620px;color:var(--muted);font-size:20px}.reference-group{margin:38px 0}.reference-group h2{border-bottom:2px solid var(--ink);padding-bottom:11px;font-size:25px}.reference-group dl{margin:0}.reference-group dl div{border-bottom:1px solid var(--line);grid-template-columns:190px 1fr;gap:26px;padding:16px 0;display:grid}.reference-group dt{font:400 15px/1.4 var(--ui)}.reference-group dt span{color:var(--accent);margin-top:3px;font-size:12px;display:block}.reference-group dd{color:var(--muted);margin:0}.reference-pattern{border-top:3px solid var(--secondary);background:var(--soft);margin:48px 0;padding:28px}.reference-pattern h2{margin-bottom:8px;font-size:28px}.reference-pattern ol{margin-bottom:0;padding-left:22px}.back-course{font:400 15px/1.4 var(--ui);margin:0 0 72px;display:inline-block}@media (width<=900px){:root{--gutter:32px}.course-hero{grid-template-columns:1fr 1fr;gap:28px}.course-module{grid-template-columns:1fr;gap:22px}.module-heading>p:last-child{max-width:52ch}.lesson-main{grid-template-columns:140px minmax(0,var(--reading-width));gap:25px}}@media (width<=720px){:root{--gutter:24px}.site-header,.site-header nav{gap:18px}.course-hero{grid-template-columns:1fr;gap:32px;padding-block:42px}.course-hero h1{font-size:clamp(48px,14vw,72px)}.hero-dek{max-width:none}.learning-method{grid-template-columns:1fr;gap:24px}.section-heading{align-items:start}.lesson-card{grid-template-columns:36px 1fr}.lesson-state{display:none}.site-footer{display:block}.site-footer span{margin-bottom:8px;display:block}.lesson-main{grid-template-columns:minmax(0,var(--reading-width));gap:24px}.lesson-rail{position:static}.lesson-rail ol{gap:18px;margin:18px 0;display:flex}.lesson-rail li{border:0;padding:0}.rail-source{display:none}.lesson-progress{margin-bottom:34px}.lesson-hero h1{font-size:clamp(40px,10vw,58px)}.concept-grid{grid-template-columns:1fr}.concept-grid article{grid-template-columns:62px 1fr;gap:10px;display:grid}.concept-grid article p{grid-column:2}.config-row,.reference-group dl div,.lesson-glossary dl div{grid-template-columns:1fr;gap:7px}.comparison>div{grid-template-columns:1fr}.reading{grid-template-columns:1fr;gap:10px}.lesson-nav{grid-template-columns:1fr}}@media (width<=460px){:root{--gutter:20px}.brand{gap:9px;font-size:25px}.brand .logo-mark{width:32px}.site-header nav a:first-child{display:none}.lesson-specimen{padding:24px}.flow-arrow{width:32px}.flow-node{padding:17px 6px}.flow-node span{font-size:11px}.section-heading{display:block}.course-progress{width:100%;margin-top:22px}}@media print{body{background:#fff;font-size:11pt}.site-header,.site-footer,.lesson-rail,.lesson-progress,.submit-answer,.reveal-answer,.exercise-reveal,.lesson-nav{display:none}.lesson-main,.reference-main{width:100%;padding:0;display:block}.question,.config-card,.worked-example{break-inside:avoid}.glossary-term,.tco-trigger{border:0}.term-popover{display:none!important}}
