@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Libre+Caslon+Display&display=swap');
:root{--ink:#163f35;--paper:#f7f5ed;--muted:#58665e;--line:#d9ddd1;--gold:#e7b46a;--orange:#a4482b}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 'DM Sans',system-ui,sans-serif}button,input,textarea,select{font:inherit}button,a,label.import{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);background:white;color:var(--ink);border-radius:6px;padding:10px 16px;min-height:44px}button:hover{border-color:var(--ink);background:#edf0e7}button:disabled{opacity:.45;cursor:default}a{color:var(--ink)}:focus-visible{outline:3px solid var(--orange);outline-offset:4px}.skip{position:fixed;left:12px;top:-100px;background:white;padding:10px;z-index:10}.skip:focus{top:8px}.top{height:86px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 36px;background:var(--paper)}.brand{text-decoration:none;display:flex;gap:12px;align-items:center;line-height:1.2;font-size:25px;font-weight:700;letter-spacing:1px}.brand b{display:block;font-size:10px;letter-spacing:2px;margin-top:5px}.brandmark{font-size:38px;border:1px solid var(--ink);width:48px;height:48px;text-align:center;line-height:44px}.edition,.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700}.top #menu{display:none}.layout{display:grid;grid-template-columns:290px minmax(0,1fr)}aside{border-right:1px solid var(--line);padding:32px 22px;align-self:start;position:sticky;top:0;max-height:100vh;overflow:auto}.sidehead{padding:0 10px 24px}.sidehead h2{font-family:'Libre Caslon Display',Georgia,serif;font-size:35px;font-weight:400;margin:8px 0}.sidehead p{font-size:13px;color:var(--muted);margin:0 0 16px}progress{width:100%;height:7px;accent-color:var(--ink);display:block;margin:8px 0}small{font-size:11px;color:var(--muted)}nav{display:grid;gap:3px}nav button{display:flex;gap:13px;text-align:left;border:0;background:transparent;padding:12px 10px;align-items:center;font-size:12px;line-height:1.4}nav button.active{background:var(--ink);color:white}nav .num{font-size:11px;border:1px solid #b5bfb1;border-radius:50%;width:26px;height:26px;display:grid;place-items:center;flex-shrink:0}.sidefoot{border-top:1px solid var(--line);margin-top:22px;padding:22px 10px;font-size:11px}.sidefoot button{font-size:11px;width:100%;margin-bottom:10px}.sidefoot p{color:var(--muted)}label.import{display:block;text-align:center;text-decoration:underline;cursor:pointer}label.import input{display:block;max-width:100%;font-size:10px;margin-top:8px}main{min-width:0}.intro{padding:52px 6%;display:grid;grid-template-columns:1.2fr 1fr;align-items:center;gap:32px;border-bottom:1px solid var(--line);background:#e9ecdf}.intro h1{font-family:'Libre Caslon Display',Georgia,serif;font-size:clamp(38px,4vw,65px);line-height:1.03;font-weight:400;margin:20px 0}.intro h1 em{font-weight:400;color:#597257}.intro p{max-width:470px;font-size:14px;color:#4d6254;line-height:1.8}.primary{background:var(--ink);color:white;border-color:var(--ink)}.primary:hover{background:#29594b;color:white}.intro button{margin-top:10px;font-size:12px}.hero-house{width:100%;max-width:470px;transform:rotate(-2deg)}.trace{animation:flow 5s linear infinite}@keyframes flow{to{stroke-dashoffset:-84}}article{padding:42px 6%;max-width:1100px;margin:auto}.lesson-top{display:flex;justify-content:space-between;gap:12px;align-items:center}.tag{font-size:11px;padding:4px 10px;background:#e9ecdf;border-radius:30px}.lesson-title{font-family:'Libre Caslon Display',Georgia,serif;font-size:clamp(38px,4.3vw,62px);line-height:1.06;font-weight:400;margin:16px 0}.deck{color:var(--muted);font-size:17px;max-width:680px}.goal{border-left:3px solid var(--orange);padding:5px 0 5px 18px;font-size:13px;margin:24px 0}.goal strong{display:block;text-transform:uppercase;font-size:10px;letter-spacing:1.5px;margin-bottom:4px}.audio-panel{background:var(--ink);color:white;padding:22px;border-radius:8px;margin:28px 0}.audio-panel h3{margin:0;font-size:16px}.audio-panel p{font-size:11px;color:#d0ddcf;margin:4px 0 12px}audio{width:100%;height:44px}.audio-row{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:8px;font-size:11px}.audio-row a{color:white}.audio-row select{font-size:12px;border-radius:4px;padding:4px;background:white;color:var(--ink)}.audio-error{color:#ffd098!important}.reading{display:grid;grid-template-columns:1fr 1fr;gap:8px 40px;margin:32px 0}.reading h3{font-size:17px;margin:20px 0 8px}.reading p{font-size:14px;color:#40544a;margin:0;line-height:1.85}.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-top:36px;gap:20px}.section-head h3{font-size:21px;margin:0}.section-head small{font-size:10px}.diagram{border:1px solid var(--line);border-radius:8px;background:#eceee4;overflow:hidden;margin:14px 0 28px}.diagram-viz{padding:28px;display:flex;align-items:center;gap:10px}.node{width:25%;height:75px;display:flex;justify-content:center;align-items:center;text-align:center;background:#d7dfce;border:1px solid #a6b69f;font-size:12px;padding:8px;position:relative;border-radius:4px}.node:not(:last-child):after{content:'→';position:absolute;right:-14px;z-index:1;font-size:18px;color:var(--ink)}.node.selected{background:var(--ink);color:white;box-shadow:0 5px 16px #123f3525;transform:translateY(-5px);transition:transform .3s}.diagram-detail{border-top:1px solid #d2d9ca;background:#fffdf5;padding:20px 26px;min-height:115px}.diagram-detail b{font-size:16px}.diagram-detail p{font-size:13px;margin:4px 0}.diagram-controls{display:flex;justify-content:space-between;align-items:center;padding:12px 26px;background:#fffdf5;gap:12px}.diagram-controls button{font-size:11px}.diagram-caption{font-size:10px;color:var(--muted);margin:0 26px 18px}.case{background:#f1e6d4;padding:24px;border-radius:6px;margin:26px 0}.case h3{font-size:15px;margin:0 0 8px}.case p{font-size:14px;margin:0}.assignment{margin:26px 0}.assignment h3{font-size:20px;margin-bottom:8px}.assignment p{font-size:14px}.assignment label{display:block;font-size:12px;margin:16px 0 6px}textarea{width:100%;min-height:110px;resize:vertical;background:#fffdf7;border:1px solid #bdc8b8;border-radius:6px;padding:14px;font-size:14px;color:var(--ink)}.quiz{border-top:1px solid var(--line);margin-top:32px;padding-top:12px}.quiz fieldset{border:0;padding:0;margin:24px 0}.quiz legend{font-size:14px;font-weight:700;margin-bottom:10px}.option{display:flex;gap:10px;border:1px solid var(--line);background:#fffdf8;border-radius:5px;padding:11px 14px;font-size:13px;align-items:center;margin:7px 0;cursor:pointer;min-height:46px}.option:has(input:checked){border-color:var(--ink);background:#e5ecde}.option input{accent-color:var(--ink)}.feedback{font-size:13px;padding:10px 14px;border-left:3px solid var(--ink);margin-top:10px}.feedback.wrong{border-color:var(--orange)}.resources{margin:32px 0;padding-top:24px;border-top:1px solid var(--line)}.resources h3{font-size:17px}.resources a{display:block;font-size:13px;margin:8px 0}.resources p{font-size:11px;color:var(--muted)}.lesson-bottom{display:flex;justify-content:space-between;gap:15px;border-top:1px solid var(--line);padding-top:24px;margin-top:28px}.lesson-bottom button{font-size:12px}footer{font-size:11px;line-height:1.8;color:var(--muted);padding:32px 6%;border-top:1px solid var(--line)}#toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#173e35;color:white;max-width:90vw;padding:12px 22px;border-radius:6px;box-shadow:0 5px 20px #0002;font-size:13px;display:none;z-index:5}.complete-banner{background:#dfebd9;padding:18px;margin:24px 0;border:1px solid #a4b99b;font-size:14px}
@media(min-width:1450px){.layout{grid-template-columns:310px 1fr}.intro{padding-top:70px;padding-bottom:70px}}@media(max-width:950px){.layout{grid-template-columns:240px 1fr}.top{padding:0 24px}.intro{grid-template-columns:1fr}.hero-house{display:none}.edition{display:none}.reading{grid-template-columns:1fr;gap:0}.sidehead h2{font-size:30px}}@media(max-width:650px){.top{height:72px;padding:0 18px;position:sticky;top:0;z-index:4}.brand{font-size:20px}.brand b{font-size:8px}.brandmark{width:38px;height:38px;font-size:30px;line-height:34px}.top #menu{display:block;font-size:11px;padding:7px 10px}.layout{display:block}aside{display:none;position:fixed;top:72px;bottom:0;left:0;width:min(340px,100%);z-index:3;background:var(--paper);max-height:calc(100dvh - 72px);box-shadow:10px 0 30px #0002}aside.open{display:block}.intro{padding:34px 22px;gap:0}.intro h1{font-size:43px}.intro p{font-size:13px}.eyebrow{font-size:9px;letter-spacing:1.3px}article{padding:32px 22px}.lesson-title{font-size:43px}.deck{font-size:15px}.diagram-viz{padding:22px 12px;gap:8px}.node{font-size:10px;padding:5px;min-height:72px}.node:not(:last-child):after{right:-12px;font-size:15px}.diagram-detail{padding:18px}.diagram-controls{padding:10px 18px}.diagram-caption{margin:0 18px 18px}.audio-panel{padding:18px}.lesson-bottom{flex-wrap:wrap}.section-head{align-items:start}.section-head small{max-width:100px}.reading p{font-size:14px}.sidefoot p{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media print{aside,.top,.intro,.audio-panel,.diagram-controls,.lesson-bottom,#toast,button{display:none}.layout{display:block}article{padding:0}.reading{display:block}body{background:white}.quiz .option{border:0}textarea{height:auto}footer{padding:20px 0}}

.audio-panel video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#0b241e;border-radius:6px;object-fit:contain}.media-modes{display:flex;gap:8px;margin:14px 0}.media-modes button{font-size:12px;min-height:42px;padding:8px 14px;background:transparent;color:#fff;border-color:#76917e}.media-modes button[aria-pressed="true"]{background:#e7b46a;border-color:#e7b46a;color:#173f36}.audio-row span{font-size:11px}.audio-panel details{margin-top:14px;font-size:12px}@media print{.media-modes{display:none}}

.footage-credits a{color:#e7b46a}.footage-credits ul{padding-left:18px}.footage-credits li{margin:8px 0;line-height:1.6}.footage-credits p{color:#d0ddcf}