:root{--navy:#122e3c;--teal:#176f70;--paper:#f5f3ed;--muted:#687b81;--border:#dce1dc;--orange:#ba653f}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--navy);font:16px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}a{color:inherit}button,input,select,textarea{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}aside{position:fixed;width:250px;inset:0 auto 0 0;background:var(--navy);color:#e9efed;padding:36px 26px;display:flex;flex-direction:column}.brand{text-decoration:none;font-size:25px;font-weight:750;letter-spacing:3px}.mark{color:#85c6bd;font-size:35px;margin-right:9px}.edition{display:block;font-size:9px;letter-spacing:2px;color:#9cbbb9;margin:12px 0 40px}nav a{display:flex;gap:17px;text-decoration:none;padding:13px 10px;margin:4px 0;border-radius:5px;color:#8ca6af;font-size:12px}nav a span{font-size:14px;color:#dce7e8}nav a.active{background:#284653;color:#94d5c9}nav a.active span{color:white}.destination{margin-top:auto;font-size:12px;color:#a4bdc3}.destination small{letter-spacing:1.6px;font-size:9px}.destination strong,.destination span{display:block}.destination strong{font-size:18px;color:white;margin-top:12px}.line{height:1px;background:#39515a;margin:24px 0}.workspace{margin-left:250px}header{height:76px;border-bottom:1px solid var(--border);padding:0 48px;display:flex;align-items:center;justify-content:space-between;font-size:10px;letter-spacing:2px;color:var(--muted)}button{border:1px solid var(--border);background:white;border-radius:5px;padding:9px 16px;color:var(--navy)}button:hover{border-color:var(--teal)}button.primary{background:var(--teal);color:white;border-color:var(--teal)}main{max-width:1200px;margin:auto;padding:42px 48px 60px}h1{font:normal 48px/1.1 Georgia,serif;letter-spacing:-1.5px;margin:10px 0 20px}h2{font-size:24px;line-height:1.3;margin:0 0 16px}h3{font-size:18px;line-height:1.35;margin:0 0 12px}p{margin:0 0 16px}.eyebrow{font-size:10px;letter-spacing:2px;text-transform:uppercase;color:var(--teal);font-weight:700}.muted{color:var(--muted)}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:20px;align-items:center;padding-bottom:35px}.hero p{max-width:430px}.hero .boat{width:100%}.badge{display:inline-block;font-size:11px;border-radius:3px;padding:4px 9px;background:#e2ece6;color:var(--teal)}.grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.card{padding:25px;background:#fffef9;border:1px solid var(--border);border-radius:8px}.card.link{cursor:pointer;text-decoration:none;display:block;transition:transform .15s}.card.link:hover{transform:translateY(-3px);border-color:var(--teal)}.card .number{font:italic 38px Georgia;color:#b7c8bf;float:right}.stats{display:flex;border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:17px 0;margin-bottom:30px;gap:40px}.stats strong{font-size:22px}.stats span{font-size:12px;color:var(--muted);margin-left:8px}.section-title{display:flex;justify-content:space-between;align-items:center;margin:35px 0 18px}.section-title h2{margin:0;font-size:21px}.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--border);border-radius:8px;overflow:hidden}.timeline>div{padding:20px;border-right:1px solid var(--border)}.timeline strong{display:block}.timeline small{color:var(--muted)}.toolbar{display:flex;gap:12px;margin:20px 0;flex-wrap:wrap}input,select,textarea{padding:12px;border:1px solid var(--border);border-radius:5px;background:#fffef9;color:var(--navy)}input{flex:1;min-width:180px}textarea{width:100%;min-height:100px;resize:vertical}.chapterlist{display:grid;grid-template-columns:1fr 1fr;gap:12px}.chapterlist a{display:block;text-decoration:none;background:white;padding:20px;border:1px solid var(--border);border-radius:6px}.chapterlist a small{color:var(--teal);display:block}.reading{max-width:760px}.reading h1{font-size:39px}.bodytext{white-space:pre-line;font-size:17px;line-height:1.85}.sourcebar{font-size:12px;color:var(--muted);background:#e9ede7;padding:14px 18px;border-radius:5px;margin:20px 0}.sourcebar a{color:var(--teal)}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:24px 0}.notice{border-left:3px solid var(--orange);padding:14px 18px;background:#f4eae0;font-size:14px;margin:20px 0}.term{border-bottom:1px solid var(--border);padding:15px 0;display:grid;grid-template-columns:1fr 1fr 1.4fr;gap:15px}.term strong{color:var(--teal)}.boat{width:100%;max-height:430px}.part-buttons{display:flex;gap:8px;flex-wrap:wrap}.part-buttons button.active{background:var(--teal);color:white}.partdetail{min-height:130px;margin-top:20px}.flash{padding:45px;text-align:center;min-height:220px}.flash h2{font:34px Georgia}.choices{display:grid;gap:10px;margin:20px 0}.choices button{text-align:left;padding:16px}.choices button.correct{background:#d9eee0;border-color:#418b61}.choices button.wrong{background:#f5e0d8;border-color:#b6694f}.choices button:disabled{cursor:default;color:var(--navy)}.slide{min-height:330px;background:white;border:1px solid var(--border);padding:30px;white-space:pre-line;line-height:1.7}.book{padding:24px 0;border-bottom:1px solid var(--border)}.book small{color:var(--muted)}footer{margin:0 48px;border-top:1px solid var(--border);padding:22px 0;font-size:11px;color:var(--muted)}.hidden{display:none!important}a:focus-visible,button:focus-visible{outline:3px solid #e4aa65;outline-offset:3px}@media(max-width:900px){aside{width:200px;padding:25px 16px}.workspace{margin-left:200px}main{padding:30px 24px}header{padding:0 24px}.hero{grid-template-columns:1fr}h1{font-size:40px}.hero .boat{max-height:230px}.stats{gap:20px}}@media(max-width:640px){aside{position:static;width:100%;padding:15px 20px}.brand{font-size:20px}.edition,.destination{display:none}nav{display:flex;overflow:auto;margin-top:10px}nav a{white-space:nowrap;padding:7px;font-size:0;gap:0}nav a span{font-size:12px}.workspace{margin:0}header{height:50px;font-size:8px}main{padding:25px 20px}.grid,.chapterlist,.timeline{grid-template-columns:1fr}.timeline>div{border-right:0;border-bottom:1px solid var(--border)}h1{font-size:36px}.stats{gap:10px;justify-content:space-between}.stats span{display:block;margin:0}.term{grid-template-columns:1fr 1fr}.term span{grid-column:1/-1}.flash{padding:25px}footer{margin:0 20px}.reading h1{font-size:32px}}@media print{aside,header,footer,.toolbar,.actions,textarea{display:none}.workspace{margin:0}main{padding:0}.card{break-inside:avoid}body{background:white}}

.button{display:inline-block;padding:14px 20px;border-radius:8px;text-decoration:none}.button.primary{background:#17665d;color:white}
/* Interactive 3D atlas */
.y3d{background:#0b202b;color:#dce9e8;border:1px solid #23434e;border-radius:18px;overflow:hidden;margin:24px 0;box-shadow:0 24px 60px #08242f20;font-size:14px}.y3d-stage{position:relative;height:650px;min-height:360px;background:radial-gradient(ellipse at 52% 40%,#234958 0,#122d3a 42%,#091c27 100%);overflow:hidden;isolation:isolate}.y3d canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab}.y3d canvas:active{cursor:grabbing}.y3d-caption{position:absolute;left:25px;top:22px;pointer-events:none;display:flex;flex-direction:column;gap:3px}.y3d-caption span{font-size:12px;letter-spacing:3px;color:#e6e8dc}.y3d-caption small{font-size:8px;letter-spacing:2px;color:#90a9ae}.y3d-help{position:absolute;bottom:18px;left:24px;right:65px;font-size:10px;letter-spacing:.3px;color:#a3b7ba;pointer-events:none}.y3d-tools{position:absolute;bottom:20px;right:16px;display:flex;flex-direction:column;gap:6px}.y3d button{color:#c7d9dc;background:#173641;border:1px solid #33515b;transition:background .15s,border-color .15s}.y3d button:hover,.y3d button.active{background:#2c575b;border-color:#67bcae;color:white}.y3d-tools button{padding:3px;width:36px;height:36px;font-size:21px}.y3d-labels{position:absolute;inset:0;pointer-events:none}.y3d .y3d-label{position:absolute;top:0;left:0;width:142px;height:43px;padding:5px 9px;text-align:left;border-radius:6px;background:#0b202be8;backdrop-filter:blur(6px);border-color:#59737b8a;pointer-events:auto;line-height:1.25;box-shadow:0 3px 14px #0002}.y3d-label:before{content:'';position:absolute;width:5px;height:5px;border-radius:50%;background:#82d4c5;left:-9px;top:18px}.y3d-label span{display:block;font-size:11px;color:#e5f1ef;font-weight:600}.y3d-label small{font-size:9px;color:#89a9b0}.y3d .y3d-label.selected{border-color:#8ce7c9;background:#1d504e}.y3d-label[hidden]{display:none}.y3d-controls{border-top:1px solid #29454e;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;padding:16px 20px}.y3d-views,.y3d-toggles{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.y3d-views>span{font-size:8px;letter-spacing:2px;margin-right:8px;color:#88a2aa}.y3d-controls button{padding:6px 10px;font-size:11px}.y3d-toggles label{display:flex;gap:6px;align-items:center;font-size:11px;margin-right:9px;cursor:pointer}.y3d-toggles input{min-width:0;width:14px;height:14px;accent-color:#66c6b2;flex:0}.y3d-groups{display:flex;gap:6px;overflow:auto;padding:0 20px 18px}.y3d-groups button{white-space:nowrap;font-size:11px;padding:7px 12px;border-radius:20px}.y3d-bottom{display:grid;grid-template-columns:220px 1fr;background:#102a35;border-top:1px solid #29454e;min-height:240px}.y3d-partlist{padding:15px;border-right:1px solid #29454e;max-height:300px;overflow-y:auto}.y3d-partlist button{display:block;width:100%;text-align:left;padding:7px 10px;background:transparent;border-color:transparent;line-height:1.3}.y3d-partlist span{display:block;font-size:12px}.y3d-partlist small{font-size:10px;color:#88a7ae}.y3d-detail{padding:30px}.y3d-detail h2{font:normal 30px/1.2 Georgia,serif;margin:10px 0 14px;color:#f2f0e4}.y3d-detail p{color:#b6cccf;font-size:14px;line-height:1.75}.y3d-detail .eyebrow{color:#79c4b4}.y3d-detail small{color:#79969f;font-size:11px}.y3d-detail-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.y3d-detail-actions button,.y3d-detail-actions a{font-size:11px}.y3d-detail-actions a{color:#87d1c0}.y3d-mini{margin:0;border-radius:12px}.y3d-mini .y3d-stage{height:390px;min-height:320px}.y3d-mini .y3d-caption{left:18px;top:15px}.y3d-mini .y3d-help{left:18px;font-size:9px}.y3d-open{display:block;padding:12px 18px;background:#102a35;color:#a4dece;text-decoration:none;font-size:12px}.y3d:fullscreen,.y3d-expanded{overflow:auto;border-radius:0}.y3d:fullscreen .y3d-stage,.y3d-expanded .y3d-stage{height:75vh}.y3d-expanded{position:fixed;inset:0;z-index:1000;margin:0}.y3d-error{padding:70px 30px;color:#e5e8df}.atlas-heading{display:flex;justify-content:space-between;align-items:end;gap:20px}.atlas-heading p{max-width:430px;font-size:14px}.atlas-heading h1{margin-bottom:0}.atlas-note{font-size:12px;color:var(--muted)}@media(min-width:1100px){main:has(.atlas-heading){max-width:1450px;padding-left:32px;padding-right:32px}}@media(max-width:640px){.y3d-stage{height:530px}.y3d-bottom{grid-template-columns:1fr}.y3d-partlist{display:flex;gap:5px;overflow-x:auto;max-height:none;border-right:0;border-bottom:1px solid #29454e}.y3d-partlist button{min-width:125px}.y3d-detail{padding:22px}.y3d-controls{padding:12px}.y3d-groups{padding-left:12px}.y3d-help{font-size:9px;left:14px}.atlas-heading{display:block}.atlas-heading p{margin-top:18px}.y3d-mini .y3d-stage{height:340px}}@media(prefers-reduced-motion:reduce){.y3d *{transition:none}}@media print{.y3d-controls,.y3d-groups,.y3d-tools,.y3d-help{display:none}}

.y3d-leaders{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}.y3d-leaders line{stroke:#91b8b4;stroke-width:1;opacity:.65}.y3d-leaders circle{fill:#a1e4d0}.y3d-label:before{display:none}

/* Editorial reading and learning */
aside{padding:25px 20px;overflow:auto;z-index:40}.edition{margin:6px 0 18px}.brand{font-size:24px}#nav a{padding:9px 10px;margin:0}.destination{margin-top:20px;padding-top:18px;border-top:1px solid #39515a}.destination button{font-size:10px;margin-top:10px;background:transparent;border-color:#46616b;color:#bdd0d0}.side-course{margin-top:26px;flex:1}.side-course>.eyebrow{color:#8da9b0;font-size:8px}#lessonNav{margin-top:8px}#lessonNav a,#lessonNav>div{display:flex;gap:9px;padding:7px 6px;font-size:10px;line-height:1.4;text-decoration:none;color:#adcbcb}#lessonNav a:hover,#lessonNav a.selected{background:#234854;border-radius:4px}#lessonNav [aria-disabled]{color:#819198;cursor:default}#lessonNav [aria-disabled] span{color:#88959b}header{position:sticky;top:0;background:#f5f3edf5;z-index:30;height:64px;letter-spacing:.8px}.header-actions{display:flex;align-items:center;gap:24px}.header-actions kbd{font-size:10px;border:1px solid #ccd7d2;border-radius:4px;padding:3px 5px;margin-left:8px}header a{text-decoration:none}.skip-link{position:absolute;top:-100px;left:260px;background:white;padding:8px;z-index:90}.skip-link:focus{top:8px}.small{font-size:13px}.spaced{margin-top:28px}.lead{font-size:19px;line-height:1.65;color:#556d73;max-width:780px;margin-bottom:28px}.hero h1{font-size:56px}.roadmap{display:grid;gap:12px;margin:26px 0}.lesson{display:grid;grid-template-columns:48px 1fr 25px;gap:20px;padding:25px;border:1px solid var(--border);background:#fffef9;border-radius:9px;text-decoration:none}.lesson-num{font:32px Georgia;color:var(--teal)}.lesson h3{margin:5px 0 9px;font-size:21px}.lesson p{font-size:14px;margin-bottom:6px;color:#5a7077}.lesson small{font-size:10px;letter-spacing:.7px;color:var(--teal)}.lesson.available:hover{border-color:#41867d;background:#fcfff8}.lesson.locked{background:#ebede9;border-style:dashed;color:#6d787b}.lesson.locked .lesson-num,.lesson.locked small,.lesson.locked p{color:#727d80}.lesson-action{align-self:center;color:#8b9a9b}.compact .lesson{padding:18px 22px}.compact .lesson h3{font-size:18px}.compact .lesson p{font-size:12px}.chapter-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.chapter-card{padding:25px;background:#fffef9;border:1px solid var(--border);border-radius:9px;text-decoration:none;display:flex;flex-direction:column}.chapter-card:hover{border-color:var(--teal)}.chapter-card h3{margin:12px 0}.chapter-card p{font-size:14px;color:#60767b}.chapter-card .arrow{font-size:13px;color:var(--teal);margin-top:auto}.reader{display:grid;grid-template-columns:minmax(0,760px) 180px;gap:38px;align-items:start}.reader h1{font-size:43px}.reader article{min-width:0}.reader article p{font-size:17px;line-height:1.85}.reader-toc{position:sticky;top:92px;padding-top:40px;font-size:12px}.reader-toc button{display:block;width:100%;text-align:left;background:none;border:0;border-left:2px solid #d4dfd6;border-radius:0;margin:8px 0;padding:7px 12px;font-size:12px;line-height:1.5}.reader-toc button:hover{border-color:var(--teal);color:var(--teal)}.reader-toc a{display:block;margin-top:18px;font-size:11px;color:var(--teal)}.learn-goals{background:#e8eee6;border-radius:8px;padding:23px 27px;margin:24px 0 35px}.learn-goals ul{margin:12px 0 0;padding-left:21px}.learn-goals li{margin:7px 0;font-size:15px}.chapter-section{margin:40px 0;scroll-margin-top:95px}.chapter-section h2{font-size:26px;line-height:1.4}.chapter-section li{margin:15px 0}table{width:100%;border-collapse:collapse;background:#fffef9;font-size:14px}td,th{padding:15px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}th{font-size:11px;letter-spacing:.5px;background:#e6ede6;color:#416469}td:first-child{font-weight:600;width:27%}.table-wrap{overflow-x:auto;margin:22px 0}figure{margin:26px 0;padding:16px;background:#fff;border:1px solid var(--border);border-radius:9px}.image-open{display:block;border:0;padding:0;background:#fff;width:100%;cursor:zoom-in;overflow:hidden}.image-open img{display:block;max-width:100%;max-height:540px;margin:auto;object-fit:contain}figcaption{font-size:11px;line-height:1.6;color:var(--muted);margin:12px 2px}figcaption span{display:block;color:var(--teal)}.reader p.look,.look{font-size:14px;line-height:1.7;background:#eef2eb;padding:13px 16px;margin:12px 0 0;border-radius:5px}.case{padding:24px;background:#eceee3;border:1px solid #d9dfce;border-radius:8px;margin:14px 0}.case h3{margin-top:15px}.case summary{font-weight:600;cursor:pointer;line-height:1.6}.case p{margin:18px 0}.case a{font-size:13px;color:var(--teal)}details summary{cursor:pointer}details[open]>summary{margin-bottom:16px}.sourcebox{padding:22px;background:#e9ede7;border-radius:7px;margin:28px 0;font-size:13px}.sourcebox li{margin:10px 0}.reader .sourcebox p{font-size:13px}.term-chips{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}.term-chips button{font-size:13px;padding:10px 13px;text-align:left}.term-chips small{display:block;font-size:10px;color:var(--teal);margin-top:3px}.term button{border:0;text-align:left;background:none;padding:0;font-weight:650;color:var(--navy)}.term{font-size:14px}.term a{color:var(--teal)}.toolbar select{max-width:100%}.toolbar #cardFilter{max-width:340px}.inline-check{display:flex;align-items:center;gap:9px;font-size:13px}.inline-check input,.checklist input{min-width:0;width:18px;height:18px;flex:none;accent-color:var(--teal)}.flashcard{border:1px solid #d1ddd4;border-radius:16px;box-shadow:0 10px 35px #123b3d08;background:#fffef9;padding:30px 38px;margin:24px 0;text-align:center;min-height:340px}.flash-meta{display:flex;justify-content:space-between;gap:24px;font-size:11px;color:#687e82;text-align:left}.flash-question{font:40px/1.25 Georgia;margin:50px auto 28px;max-width:650px}.flash-question.definition{font:25px/1.5 Georgia}.identify-photo{max-height:280px;max-width:100%;object-fit:contain}.flash-answer{border-top:1px solid var(--border);padding:24px 0;margin-top:25px}.flash-answer h2{color:var(--teal);font-size:27px}.flash-answer p{margin:15px auto;max-width:620px}.flash-answer a{font-size:13px}.ratings{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.ratings button{font-size:13px}.finished{min-height:240px;display:flex;flex-direction:column;justify-content:center;gap:20px}.print-block{margin:35px 0;padding:25px;border:1px solid var(--border);border-radius:9px;background:#e8ede6}.print-block p{font-size:14px}.print-block>a:last-child{display:block;font-size:13px;margin-top:15px}.quiz-card h2{margin-top:20px}.checklist{background:#fffef9;padding:24px;border:1px solid var(--border);border-radius:8px;margin:14px 0}.checklist summary{font-size:18px;font-weight:600}.checklist p{color:var(--muted);font-size:13px}.checklist label{display:flex;align-items:flex-start;gap:12px;margin:15px 0;font-size:14px}.checklist label:has(input:checked) span{color:#758a83;text-decoration:line-through}.slide-images{display:grid;grid-template-columns:repeat(2,1fr);gap:15px;margin-top:15px}.slide-images img{max-height:450px}.slide{font-size:14px;min-height:120px}.timeline small{display:block;line-height:1.6}.timeline strong{margin:8px 0}.timeline span{font-size:13px;margin-bottom:10px}dialog{border:1px solid #d2dfd5;border-radius:14px;padding:42px;max-width:min(1050px,94vw);max-height:92vh;color:var(--navy);background:#fffef9}dialog::backdrop{background:#09232bc9;backdrop-filter:blur(4px)}dialog h2{font:34px Georgia}dialog p{max-width:700px}dialog #closeDialog{position:absolute;right:10px;top:10px;padding:2px 10px}.full-image{max-width:100%;max-height:75vh;object-fit:contain;display:block;margin:auto}dialog>p{font-size:13px;margin-top:20px}#storageNotice{color:#efbb89;font-size:11px}button:disabled{cursor:default;opacity:.6}
@media(min-width:1300px){main{max-width:1320px}.hero{grid-template-columns:1fr 1.1fr}.reader{grid-template-columns:minmax(0,800px) 200px}}
@media(max-width:1100px){.reader{display:block;max-width:780px}.reader-toc{display:none}.hero h1{font-size:48px}}
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@media(max-width:640px){aside{position:static;overflow:visible;padding:12px 16px}.side-course,.destination{display:none}#nav{gap:3px}#nav a{padding:8px 10px}.brand{font-size:21px}.edition{display:none}.header-actions kbd{display:none}.lead{font-size:17px}.hero h1{font-size:42px}.lesson{grid-template-columns:30px 1fr 14px;padding:18px 14px;gap:12px}.lesson-num{font-size:25px}.lesson h3{font-size:17px}.lesson p{font-size:12px}.lesson small{font-size:9px}.reader article p{font-size:16px}.reader h1{font-size:33px}.chapter-section h2{font-size:23px}.flashcard{padding:20px 16px}.flash-question{font-size:31px;margin:36px auto 24px}.flash-meta{font-size:9px}.ratings{display:grid}.ratings button{width:100%}dialog{padding:35px 22px 24px}.slide-images{grid-template-columns:1fr}.table-wrap table{min-width:510px}.reader article figure p.look{font-size:13px}.print-block{padding:20px}.print-block .button{font-size:13px}.skip-link{left:10px}}
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