:root{--bg:#f7fafc;--paper:#fff;--ink:#122b3b;--muted:#597080;--line:#dce8ef;--teal:#007f84;--teal-dark:#08696e;--navy:#071723;--blue:#d8eef4;--mint:#c6f4e5;font:15px/1.65 Inter,"Segoe UI",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;min-width:315px}button,input{font:inherit}button{cursor:pointer}a{color:inherit}a:hover{color:var(--teal)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #44c9bc;outline-offset:3px}button:disabled{opacity:.5;cursor:not-allowed}.sr{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:absolute;left:-10000px;top:10px;background:#fff;z-index:100;padding:8px}.skip:focus{left:10px}.site-header{position:sticky;top:0;z-index:50;background:#fffefefa;border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.head-inner{max-width:1440px;margin:auto;padding:0 30px;min-height:78px;display:flex;align-items:center;gap:34px}.brand{text-decoration:none;display:inline-flex;align-items:center;gap:10px;font-size:25px;font-weight:900;letter-spacing:-1.6px;white-space:nowrap}.brand-icon{display:grid;place-items:center;background:#0b2c38;color:#9ef0d8;border-radius:11px;width:38px;height:38px;font-size:22px;font-weight:400}.brand-accent{color:#098489}.brand-dot{color:#0c9b8b}.desktop-nav{display:flex;align-items:center;gap:23px;margin-left:22px}.desktop-nav a{text-decoration:none;font-size:13px;color:#526978;font-weight:750;white-space:nowrap}.desktop-nav a.active,.desktop-nav a:hover{color:#006f73}.head-search{margin-left:auto;border:1px solid #d8e7ee;background:#f5f9fb;border-radius:12px;display:flex;align-items:center;gap:9px;color:#7490a1;padding:0 12px;height:41px;width:min(300px,25vw)}.head-search input{border:0;outline:0;width:100%;min-width:40px;background:transparent;font-size:12px;color:#102e3e}.head-search input:focus{outline:0}.shortcut{font-size:10px;border:1px solid #dae4eb;padding:0px 6px;border-radius:5px;color:#8ca0ae}.menu-button{display:none;background:transparent;border:0;color:var(--ink);font-size:24px}.mobile-nav{border-top:1px solid var(--line);padding:12px 22px;background:white}.mobile-nav a{display:block;padding:9px 0;font-weight:700;text-decoration:none}
.page-shell{max-width:1410px;margin:auto;padding:0 30px}.hero{background:#071d2c;color:#e9f9fa;position:relative;overflow:hidden}.hero:before{content:"";position:absolute;inset:-60% -30% -65% 40%;background:radial-gradient(circle at 50% 43%,#165c60 0%,#113c4b 24%,transparent 55%);pointer-events:none}.hero:after{content:"";position:absolute;right:-90px;top:22px;width:440px;height:440px;border-radius:50%;border:1px solid #ffffff17;box-shadow:0 0 0 55px #ffffff06,0 0 0 110px #ffffff04;pointer-events:none}.hero-inner{max-width:1410px;margin:auto;padding:75px 30px 68px;position:relative}.eyebrow{text-transform:uppercase;font-size:10px;letter-spacing:2.1px;font-weight:900;color:#0e7f87}.hero .eyebrow{color:#9be8d2}.hero h1{font-size:clamp(39px,5.2vw,70px);line-height:1.12;letter-spacing:-.067em;margin:18px 0 20px;max-width:860px;font-weight:880}.hero h1 em{font-style:normal;color:#9aeed5}.hero p{max-width:640px;color:#b4cbd6;font-size:15px;line-height:1.8}.hero-buttons{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:25px 0 33px}.button-primary,.button-light{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:11px 18px;border-radius:10px;text-decoration:none;font-size:13px;font-weight:850;border:1px solid transparent}.button-primary{background:#9df2d2;color:#083c36}.button-primary:hover{background:#c7ffed;color:#083c36}.button-light{border-color:#91bcc64b;color:#e9fcfc;background:#fff0}.button-light:hover{color:#fff;background:#ffffff12}.statline{display:flex;flex-wrap:wrap;gap:11px}.stat{border:1px solid #9ec7d136;border-radius:12px;padding:11px 17px;background:#ffffff08}.stat b{font-size:21px;color:#cbfff0;display:block;line-height:1.4}.stat span{font-size:11px;color:#c0d5df}
.context-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:23px 0 10px}.context-bar h2{font-size:27px;letter-spacing:-1.3px;margin:0}.context-bar p{margin:0;color:var(--muted);font-size:12px}.scope-note{padding:13px 17px;border:1px solid #bde0da;border-left:4px solid #13a69a;background:#eef9f7;border-radius:9px;font-size:12px;color:#496878;margin:17px 0}.scope-note strong{color:#0d6e68}.stage-tabs{display:flex;gap:9px;overflow-x:auto;padding:11px 0 17px;scrollbar-width:thin}.stage-tabs button{white-space:nowrap;border:1px solid #d8e6ea;border-radius:10px;background:#fff;color:#54707e;padding:10px 15px;font-size:12px;font-weight:850}.stage-tabs button.active{background:#092e3a;color:white;border-color:#092e3a}
.find-layout{display:grid;grid-template-columns:277px minmax(0,1fr);gap:24px;align-items:start;padding-bottom:65px}.sidebar{position:sticky;top:92px;max-height:calc(100vh - 114px);overflow-y:auto;background:#fff;border:1px solid #dfe9ee;border-radius:14px;padding:16px;scrollbar-width:thin}.sidebar-head{font-size:11px;color:#8196a2;text-transform:uppercase;letter-spacing:1.4px;font-weight:900;padding:0 5px 11px}.side-group{margin:14px 5px 6px;font-size:10px;text-transform:uppercase;letter-spacing:1.5px;color:#8ca0ad;font-weight:850}.side-link{display:flex;gap:10px;align-items:center;text-decoration:none;font-size:12px;font-weight:700;line-height:1.4;padding:10px 11px;margin:3px 0;color:#426071;border-radius:9px}.side-link:hover{background:#eff8f7}.side-link.active{background:#e8f8f4;color:#086f6c}.side-link i{font-style:normal;font-size:16px;width:24px;text-align:center;color:#0d8b87}.side-link small{margin-left:auto;color:#8fa2ae;font-size:10px}
.stage-intro{border:1px solid #d9e9ec;background:#fff;border-radius:16px;padding:27px 29px;margin-bottom:20px;display:flex;gap:28px;align-items:center;justify-content:space-between}.stage-intro h3{font-size:29px;margin:5px 0 7px;letter-spacing:-1.25px;line-height:1.2}.stage-intro p{font-size:13px;color:var(--muted);margin:0;max-width:720px}.stage-graphic{font-size:59px;line-height:1;color:#b4d9d4}.section-title{font-size:19px;letter-spacing:-.7px;margin:25px 0 14px}.dept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.dept-card{display:flex;flex-direction:column;min-height:159px;gap:9px;background:#fff;border:1px solid #dce8ec;border-radius:13px;text-decoration:none;padding:18px;transition:transform .15s,border .15s}.dept-card:hover{border-color:#7bd2c6;transform:translateY(-2px);color:var(--ink)}.dept-card .icon{font-size:24px;color:#0c8c85}.dept-card strong{font-size:13px;line-height:1.45}.dept-card small{font-size:11px;color:var(--muted);margin-top:auto}.dept-card .dept-go{color:#0f9082;font-size:12px;font-weight:850}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:11px;color:#78909e;margin:8px 0 22px;flex-wrap:wrap}.breadcrumb a{color:#167b82;text-decoration:none}.dept-hero{background:#fff;border:1px solid var(--line);border-radius:15px;padding:30px;margin-bottom:22px}.dept-hero .dept-icon{width:48px;height:48px;border-radius:13px;background:#e9f8f4;display:grid;place-items:center;font-size:27px;color:#078d85}.dept-hero h1,.lesson-head h1,.resource-head h1{font-size:clamp(28px,3vw,41px);line-height:1.2;letter-spacing:-1.7px;margin:14px 0 10px}.dept-hero p,.lesson-head p{color:var(--muted);font-size:13px}.dept-tags{display:flex;gap:9px;flex-wrap:wrap}.tag,.status{font-size:10px;border-radius:100px;padding:4px 9px;background:#eaf5f5;color:#167875;font-weight:850}.status.mapped{background:#f2f5f7;color:#768a96}.status.complete{background:#ddf7ed;color:#05705d}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.topic-link{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 13px;text-decoration:none;display:flex;justify-content:space-between;gap:11px;align-items:center}.topic-link:hover{border-color:#80cfc7;color:#146f70}.topic-name{font-weight:750;font-size:12px}.topic-meta{font-size:10px;color:#869ba6;white-space:nowrap}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 255px;gap:23px;align-items:start}.lesson-head{background:#fff;border:1px solid var(--line);border-radius:15px;padding:29px;margin:0 0 17px}.lesson-head .sup{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.lesson-head p{max-width:850px;line-height:1.85}.lesson-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:20px}.action-btn{border:1px solid #d0e3e5;background:#f9fdfd;color:#236d73;font-size:12px;font-weight:850;border-radius:9px;padding:8px 12px}.action-btn.saved{background:#dff7ee;border-color:#7bcfb9;color:#056f5a}.diagram-wrap{background:#fff;border:1px solid var(--line);border-radius:15px;padding:23px;margin:0 0 17px}.diagram-head{display:flex;gap:12px;justify-content:space-between;align-items:center;margin-bottom:13px}.diagram-head h2{font-size:18px;letter-spacing:-.7px;margin:0}.diagram-head small{font-size:10px;color:var(--muted)}.diagram-frame{width:100%;padding:10px;border-radius:12px;background:#0b2030;overflow:hidden}.diagram-frame svg{display:block;width:100%;height:auto;max-height:520px}.diagram-caption{font-size:12px;color:#647d89;line-height:1.75;margin:13px 0 0}.diagram-controls{display:flex;gap:7px;flex-wrap:wrap}.diagram-controls button{background:#edf9f5;color:#0d7670;border:1px solid #cde8df;padding:7px 10px;border-radius:8px;font-size:11px;font-weight:800}.lesson-section{background:#fff;border:1px solid var(--line);padding:23px 26px;border-radius:14px;margin:12px 0}.lesson-section h3{font-size:17px;letter-spacing:-.4px;margin:0 0 9px}.lesson-section p{font-size:13px;color:#526b7a;margin:0;line-height:1.85}.caution{background:#eff7fb;border:1px solid #c8e3ee;border-left:4px solid #379bb6;padding:14px 16px;border-radius:9px;color:#4d6e7d;font-size:12px;margin:17px 0}.lesson-side{position:sticky;top:94px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}.lesson-side h3{font-size:14px;margin:0 0 13px}.lesson-side a{display:block;font-size:12px;line-height:1.5;color:#317c81;padding:8px 0;text-decoration:none;border-bottom:1px solid #ecf1f4}.lesson-side a:hover{text-decoration:underline}.lesson-side p{font-size:11px;color:var(--muted)}.source-link{display:inline-flex;align-items:center;gap:5px;padding:9px 12px;border-radius:8px;border:1px solid #c6dce3;background:#fff;color:#12727d;font-size:12px;font-weight:850;text-decoration:none}.source-link:hover{background:#ecf7f9}.quiz{border:1px solid #c6e5dc;border-radius:14px;background:#f2fbf7;padding:23px 25px;margin:18px 0}.quiz h3{margin:0 0 7px;font-size:17px}.quiz-question{font-size:13px;color:#3b5665;font-weight:750}.quiz-choices{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:15px}.quiz-choices button{padding:11px 12px;border:1px solid #d2e4dd;border-radius:9px;background:#fff;text-align:left;color:#365962;font-size:12px;font-weight:650}.quiz-choices button.correct{border-color:#23ae81;background:#d8f8e9;color:#055c47}.quiz-choices button.incorrect{border-color:#ed9b99;background:#fff0f0;color:#943a3a}.quiz-result{font-size:12px;color:#315968;margin:13px 0 0}.mapped-page{background:#fff;border:1px solid var(--line);border-radius:15px;padding:27px}.mapped-page h2{font-size:23px;letter-spacing:-1px;margin:0 0 10px}.mapped-page p,.mapped-page li{font-size:13px;line-height:1.85;color:#577182}.mapped-page ul{padding-left:22px}.resource-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;margin-top:17px}.resource-card{border:1px solid var(--line);border-radius:12px;background:#fff;padding:20px;text-decoration:none}.resource-card:hover{border-color:#72c5bc}.resource-card strong{font-size:14px}.resource-card small{display:block;font-size:11px;color:#7a929f;margin:7px 0}.resource-card .go{color:#0a857c;font-size:12px;font-weight:850}.diagram-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.diagram-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:11px;text-align:left;width:100%}.diagram-card:hover{border-color:#76c8be}.diagram-card svg{width:100%;height:auto;display:block;border-radius:8px}.diagram-card strong{display:block;font-size:12px;margin:10px 4px 2px}.diagram-card small{font-size:11px;color:#6b8291;margin:0 4px 5px;display:block}.saved-empty{border:1px dashed #b6d8d4;border-radius:15px;padding:33px;text-align:center;background:#fff;color:var(--muted)}.search-results .topic-link{margin:8px 0}.search-results .topic-link small{font-size:10px;color:var(--muted);display:block}.search-results{max-width:990px;margin:0 auto;padding:36px 25px 70px}.search-results h1,.resource-head h1{letter-spacing:-1.8px}.clear-search{padding:7px 12px;border:1px solid var(--line);border-radius:9px;background:#fff;color:#0a7376}.viewer[hidden]{display:none}.viewer{position:fixed;inset:0;background:#04121eea;z-index:100;display:grid;place-items:center;padding:20px}.viewer-panel{background:#fff;width:min(1300px,100%);max-height:94vh;border-radius:17px;display:flex;flex-direction:column;overflow:hidden}.viewer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 19px;border-bottom:1px solid #dce6eb}.viewer-head strong{font-size:13px}.viewer-controls{display:flex;align-items:center;flex-wrap:wrap;gap:6px}.viewer-controls button{border:1px solid #d8e4eb;border-radius:8px;background:#f6f9fa;color:#1b5260;padding:7px 9px;font-size:11px;font-weight:850}.viewer-controls output{font-size:11px;color:#5b7784;min-width:33px;text-align:center}.viewer-controls .viewer-close{background:#102f3b;color:white}.viewer-scroll{overflow:auto;flex:1;background:#0b2030;padding:14px}.viewer-scroll #viewer-canvas{transform-origin:top left;width:100%;min-width:450px}.viewer-scroll svg{display:block;width:100%;height:auto}.labels-off .diagram-label{opacity:0}.viewer-panel>p{padding:12px 20px;font-size:12px;color:var(--muted);margin:0;border-top:1px solid var(--line)}.resource-head{background:#fff;border:1px solid var(--line);padding:29px;border-radius:15px;margin-top:26px}.resource-head p{font-size:13px;color:var(--muted);max-width:800px}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:18px 0}.mini{border:1px solid var(--line);border-radius:12px;background:#fff;padding:16px}.mini b{font-size:21px;color:#056c69;display:block}.mini span{font-size:11px;color:var(--muted)}
footer{background:#071b29;color:#c5d9e2;padding:43px 30px 19px}.footer-wrap{max-width:1360px;margin:auto;display:flex;justify-content:space-between;gap:25px}.footer-wrap p{color:#a2b9c4;max-width:440px;font-size:12px}.footer-brand{color:#e6fff9}.footer-links{display:flex;gap:22px;flex-wrap:wrap;align-content:flex-start;font-size:12px}.footer-links a{text-decoration:none}.footer-legal{border-top:1px solid #ffffff1a;max-width:1360px;margin:30px auto 0;padding-top:14px;font-size:10px;color:#95adb9}
@media(max-width:1180px){.head-inner{gap:18px}.desktop-nav{gap:12px;margin-left:0}.find-layout{grid-template-columns:235px 1fr}.dept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:1fr}.lesson-side{position:static}}
@media(max-width:850px){.head-inner{padding:0 17px;min-height:65px}.desktop-nav{display:none}.head-search{width:min(355px,48vw)}.menu-button{display:block}.hero-inner{padding:55px 19px}.page-shell{padding:0 17px}.find-layout{grid-template-columns:1fr}.sidebar{position:static;max-height:none;padding:12px}.side-link{display:inline-flex;max-width:240px}.side-group{margin-top:17px}.dept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.diagram-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.brand{font-size:19px;letter-spacing:-.9px}.brand-icon{width:33px;height:33px;font-size:18px}.head-inner{gap:8px}.head-search{width:auto;flex:1;padding:0 7px}.head-search input{font-size:11px}.shortcut{display:none}.hero h1{font-size:41px}.hero:after{display:none}.hero-inner{padding:43px 16px}.stat{padding:8px 10px}.stat b{font-size:17px}.stat span{font-size:10px}.page-shell{padding:0 13px}.stage-intro{padding:20px}.stage-graphic{display:none}.dept-grid,.topic-list,.resource-cards,.diagram-grid,.quiz-choices,.mini-grid{grid-template-columns:1fr}.dept-card{min-height:124px}.dept-hero,.lesson-head,.diagram-wrap,.lesson-section,.mapped-page,.resource-head{padding:18px}.diagram-frame{padding:4px}.diagram-head{align-items:start;flex-direction:column}.viewer{padding:6px}.viewer-panel{max-height:98vh}.viewer-head{align-items:start;flex-direction:column}.viewer-scroll #viewer-canvas{min-width:450px}.footer-wrap{flex-direction:column}footer{padding:36px 16px 18px}}

/* Full on-site reading pages: legible long-form educational text and clearly secondary citations */
.source-reading{background:#fff;border:1px solid var(--line);border-radius:15px;padding:30px 32px;margin:18px 0}
.source-reading h2{font-size:clamp(21px,2.5vw,29px);letter-spacing:-1px;line-height:1.3;margin:10px 0 12px}
.source-reading>.reading-note{font-size:12px;color:#557381;line-height:1.9;background:#edf7f6;padding:14px;border-left:3px solid #18a698;border-radius:8px}
.reading-text{font-size:16px;line-height:2.06;color:#253f4b;letter-spacing:.03px}
.reading-text p{font-size:16px;line-height:2.06;margin:18px 0;overflow-wrap:break-word}
.source-reading .license{font-size:11px;line-height:1.8;color:#637b87;border-top:1px solid #e5eef2;padding-top:16px;margin-top:23px}
.source-reading .license a{color:#086e7a;text-decoration:underline}
.reference-secondary{margin-top:36px!important;background:#f8fbfd!important;border-style:dashed!important}
.reference-secondary h2{font-size:18px!important}.reference-secondary a{color:#197684;overflow-wrap:anywhere}
.diagram-wrap{scroll-margin-top:95px}.source-reading,.lesson-section{scroll-margin-top:95px}
@media(max-width:560px){.source-reading{padding:19px 17px}.reading-text,.reading-text p{font-size:15px;line-height:1.91}.source-reading .license{font-size:10px}.reader-controls{gap:7px}}

.concept-insight{padding:18px 20px;background:#ebf8f3;border:1px solid #b9e1d3;border-radius:12px;margin:25px 0}.concept-insight h3{font-size:15px;margin:0 0 7px;color:#0e7169}.concept-insight p{font-size:14px!important;line-height:1.8!important;color:#284f4d!important;margin:0!important}