:root{--ice:#edf4fa;--paper:#fff;--navy:#132c47;--muted:#546b81;--line:#cbdbe8;--cobalt:#244eed;--teal:#087e83;--soft:#e0edf5;--radius:16px;color:var(--navy);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:var(--ice)}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}a{color:var(--cobalt)}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--cobalt);outline-offset:4px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:fixed;top:8px;left:8px;z-index:20;padding:12px;background:white;transform:translateY(-150%)}.skip:focus{transform:none}.studio{display:grid;grid-template-columns:260px minmax(0,1fr);max-width:1600px;margin:auto}.rail{padding:38px 25px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;border-right:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--navy);font-weight:750;font-size:21px;letter-spacing:-.6px}.brand small{display:block;font-weight:500;font-size:11px;letter-spacing:1.4px;text-transform:uppercase;margin-top:5px}.brand-mark{display:grid;place-items:center;background:var(--navy);color:white;width:37px;height:43px;border-radius:5px 15px 5px 15px;font-size:25px}.rail-label,.eyebrow,.section-label{font-size:10px;letter-spacing:1.4px;font-weight:750}.rail-label{color:var(--muted);margin:56px 8px 18px}#tracks{display:grid;gap:7px}.track-button{background:none;border:1px solid transparent;padding:13px 10px;display:flex;align-items:center;gap:11px;text-align:left;border-radius:10px;color:var(--navy);font-size:13px;font-weight:600}.track-button .track-dot{width:8px;height:8px;border:1.5px solid var(--muted);border-radius:50%;flex-shrink:0}.track-button .track-count{margin-left:auto;color:var(--muted);font-size:11px}.track-button[aria-pressed=true]{background:var(--navy);color:white}.track-button[aria-pressed=true] .track-count{color:#bfd4e6}.track-button[aria-pressed=true] .track-dot{border-color:#67d3d2;background:#67d3d2}.track-button:hover:not([aria-pressed=true]){background:var(--soft)}.progress-panel{margin-top:44px;padding:19px 9px;border-top:1px solid var(--line)}.progress-title{display:flex;justify-content:space-between;font-size:11px;font-weight:650}.progress-panel progress{appearance:none;width:100%;height:5px;margin:13px 0 3px;border:0;border-radius:10px;background:var(--line)}progress::-webkit-progress-bar{background:var(--line);border-radius:10px}progress::-webkit-progress-value{background:var(--teal);border-radius:10px}progress::-moz-progress-bar{background:var(--teal);border-radius:10px}.progress-panel p,.rail-footer{font-size:12px;line-height:1.7;color:var(--muted)}.rail-footer{margin-top:auto;padding:20px 9px 0}main{padding:0 54px;min-width:0}.hero{min-height:340px;padding:52px 0 40px;display:flex;gap:20px;align-items:center;border-bottom:1px solid var(--line)}.hero-copy{flex:1}.eyebrow{color:var(--teal);line-height:1.6;margin:0 0 18px}h1{font-size:clamp(38px,4.3vw,66px);line-height:1.02;letter-spacing:-3px;font-weight:750;margin:0 0 23px}h1 span{color:var(--cobalt)}.hero-description{max-width:450px;color:var(--muted);font-size:15px;line-height:1.7;margin:0}.knowledge-map{width:260px;color:#91adbf;flex-shrink:0;transform:rotate(-5deg)}.knowledge-map svg{width:100%;overflow:visible}.knowledge-map circle{fill:var(--ice);stroke:var(--teal);stroke-width:1.5}.knowledge-map .map-center{fill:var(--cobalt);stroke:var(--cobalt)}.map-caption{display:block;text-align:center;transform:rotate(5deg);font-size:10px;letter-spacing:1px;color:var(--muted);margin-top:7px}.library{padding:36px 0 52px;scroll-margin-top:20px}.library-top{display:flex;align-items:center;justify-content:space-between;gap:16px}.library-top .eyebrow{margin-bottom:7px;font-size:9px}h2{font-size:27px;letter-spacing:-.8px;line-height:1.2;margin:0}#track-description{font-size:13px;line-height:1.6;color:var(--muted);margin:9px 0 0}.collection-count{font-size:11px;color:var(--muted);white-space:nowrap;border:1px solid var(--line);border-radius:20px;padding:8px 12px}.toolbar{display:flex;align-items:center;gap:24px;margin-top:26px}.search{display:flex;align-items:center;gap:11px;flex:1;border:1px solid var(--line);background:#f7fbfe;border-radius:10px;padding:0 15px}.search svg{width:18px;stroke:var(--muted);stroke-width:1.5;flex-shrink:0}.search input{border:0;background:none;width:100%;height:48px;color:var(--navy);font-size:13px;min-width:0}.search:focus-within{outline:2px solid var(--cobalt);outline-offset:2px}.search input:focus{outline:none}.unread{font-size:12px;white-space:nowrap;display:flex;align-items:center;gap:7px}.unread input{accent-color:var(--cobalt);width:16px;height:16px}.evidence-note{font-size:10px;color:var(--muted);line-height:1.6;margin:16px 0 24px}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.lesson-card{background:var(--paper);border:1px solid #d8e4ee;border-radius:var(--radius);padding:23px;display:flex;flex-direction:column;position:relative;min-height:250px;color:var(--navy);text-align:left;box-shadow:0 3px 0 #dbe7ef55}.lesson-card:hover{border-color:#8ba9c2;box-shadow:0 7px 16px #1836530a}.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.card-track{font-size:9px;font-weight:700;letter-spacing:.7px;color:var(--teal);text-transform:uppercase}.read-badge{font-size:10px;color:var(--teal);background:#e6f4f1;padding:4px 7px;border-radius:5px}.lesson-card h3{font-size:20px;line-height:1.28;letter-spacing:-.55px;margin:19px 0 12px;max-width:95%;font-weight:700}.card-preview{color:var(--muted);font-size:12px;line-height:1.7;margin:0 0 22px}.card-bottom{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:auto;border-top:1px solid #e7eef4;padding-top:15px}.card-fit{font-size:10px;color:var(--muted)}.card-arrow{color:var(--cobalt);font-size:19px}.empty{padding:60px 15px;text-align:center;border:1px dashed var(--line);border-radius:var(--radius);background:#f5f9fc}.empty p{color:var(--muted);font-size:14px}.button{border:1px solid var(--cobalt);background:var(--cobalt);color:white;font-weight:650;font-size:12px;border-radius:8px;padding:12px 17px;min-height:43px}.button:hover{filter:brightness(.95)}.button.secondary{color:var(--navy);background:white;border-color:var(--line)}.button:disabled{opacity:.45;cursor:default}.page-footer{padding:23px 0 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;font-size:10px;color:var(--muted)}.save-status{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);z-index:50;max-width:90vw;background:var(--navy);color:white;border-radius:8px;padding:13px 18px;font-size:12px;box-shadow:0 4px 20px #132c4733}.save-status[hidden],.empty[hidden]{display:none}dialog{border:1px solid var(--line);border-radius:20px;padding:0;width:min(880px,calc(100% - 40px));max-height:calc(100dvh - 48px);background:#fcfdff;color:var(--navy);box-shadow:0 30px 100px #07172b55;overflow-y:auto}dialog::backdrop{background:#102d4c99;backdrop-filter:blur(4px)}.reader-top{position:sticky;top:0;background:#fcfdfff5;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:15px 27px;z-index:1}.reader-track{color:var(--teal);font-size:10px;font-weight:700;letter-spacing:1px;text-transform:uppercase}.close{border:0;background:var(--soft);width:33px;height:33px;border-radius:50%;color:var(--navy);font-size:24px;line-height:1}.reader-body{padding:35px 60px 28px}.reader-body h2{font-size:35px;line-height:1.16;letter-spacing:-1.2px;margin-bottom:28px}.reader-body .eyebrow{font-size:9px}.reader-section{margin:25px 0}.section-label{display:block;color:var(--teal);font-size:9px;line-height:1.6;margin-bottom:10px}.reader-section p{font-size:15px;line-height:1.85;margin:0;white-space:pre-wrap;overflow-wrap:anywhere}.application-section{padding:24px;background:#eaf2ff;border-left:3px solid var(--cobalt);border-radius:0 9px 9px 0;margin:30px -24px}.application-section .section-label{color:var(--cobalt)}.limit-section{padding-top:23px;border-top:1px solid var(--line)}.limit-section p{color:var(--muted);font-size:13px}.reader-evidence{margin-top:30px;padding:20px;background:var(--ice);border-radius:9px}.reader-evidence p{font-size:11px;line-height:1.8;color:var(--muted);white-space:pre-wrap;overflow-wrap:anywhere}.source-links{display:flex;gap:20px;flex-wrap:wrap}.source-links a{font-size:11px;font-weight:650;text-underline-offset:4px}.reader-actions{position:sticky;bottom:0;border-top:1px solid var(--line);background:#fcfdfff5;padding:17px 27px;display:flex;gap:12px;justify-content:space-between}.reader-actions .button{min-width:135px}body:has(dialog[open]){overflow:hidden}@media(min-width:1400px){.cards{grid-template-columns:repeat(3,minmax(0,1fr))}.lesson-card{min-height:285px}}@media(max-width:1100px){main{padding:0 30px}.studio{grid-template-columns:220px minmax(0,1fr)}.rail{padding:30px 18px}.knowledge-map{width:190px}h1{letter-spacing:-2px}.hero{min-height:310px}}@media(max-width:800px){.studio{display:block}.rail{position:static;height:auto;padding:21px 24px;border-right:0;border-bottom:1px solid var(--line);display:block}.brand{font-size:18px}.brand small{font-size:9px}.brand-mark{width:31px;height:35px;font-size:20px}.rail-label,.rail-footer{display:none}#tracks{display:flex;overflow-x:auto;gap:5px;margin:21px -5px 0;padding:5px;scrollbar-width:thin}.track-button{flex-shrink:0;padding:10px 12px;font-size:11px}.track-button .track-dot{display:none}.track-count{margin-left:4px!important}.progress-panel{border:0;padding:0;margin:20px 0 0;max-width:260px}.progress-panel p{display:none}.progress-title{font-size:10px}.progress-panel progress{margin-bottom:0}main{padding:0 24px}.hero{padding:30px 0;min-height:0}.hero .eyebrow{font-size:8px;max-width:230px}.knowledge-map{width:130px}.map-caption{display:none}h1{font-size:42px;letter-spacing:-2px}.hero-description{font-size:12px;max-width:350px}.library{padding-top:27px}.library-top h2{font-size:23px}.collection-count{font-size:9px;padding:7px 9px}.toolbar{gap:12px}.unread{font-size:10px}.search input{font-size:12px}.cards{gap:13px}.lesson-card{padding:19px;min-height:260px}.lesson-card h3{font-size:18px}.card-preview{font-size:11px}.reader-body{padding:30px 35px}.reader-body h2{font-size:29px}.reader-section p{font-size:14px}.application-section{margin-inline:-14px;padding:20px}.reader-top,.reader-actions{padding:14px 20px}}@media(max-width:520px){main{padding:0 20px}.rail{padding:20px}.knowledge-map{width:100px;position:absolute;right:14px;top:210px;opacity:.55}.hero-copy{position:relative;z-index:1}.hero-description{max-width:270px}.hero h1{font-size:40px}.cards{grid-template-columns:1fr}.lesson-card{min-height:230px}.toolbar{align-items:stretch;flex-direction:column;gap:10px}.unread{align-self:flex-end}.collection-count{align-self:flex-start;margin-top:20px}dialog{width:calc(100% - 16px);max-height:calc(100dvh - 16px);border-radius:13px}.reader-body{padding:25px}.reader-body h2{font-size:27px}.reader-section p{font-size:14px;line-height:1.8}.reader-evidence{padding:16px}.reader-actions{gap:8px}.reader-actions .button{min-width:0;flex:1;font-size:11px}.page-footer{font-size:9px}.card-preview{font-size:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}