:root{color-scheme:light;--text:#252b2a;--muted:#717a76;--border:#e6eae7;--green:#277e70;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:#fff;color:var(--text)}
*{box-sizing:border-box}body{margin:0}button,input{font:inherit}a{color:inherit;text-decoration:none}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--green);outline-offset:4px}[hidden]{display:none!important}.skip-link{position:absolute;top:-70px;left:20px;padding:12px;background:#fff;z-index:20}.skip-link:focus{top:10px}.site-header{max-width:1440px;margin:auto;height:82px;border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 54px;gap:65px}.library-brand{display:flex;align-items:center;gap:11px;font-family:Georgia,'Times New Roman',serif;font-size:23px;letter-spacing:-.7px}.brand-period{color:var(--green)}.site-header nav{display:flex;gap:30px;align-items:center;height:100%;font-size:12px;color:var(--muted)}.site-header nav a{display:flex;align-items:center;height:100%;position:relative;gap:8px}.site-header nav a[aria-current=page]{color:var(--text)}.site-header nav a[aria-current=page]:after{content:'';height:2px;background:var(--green);position:absolute;bottom:0;left:0;right:0}.header-note{margin-left:auto;font-size:11px;color:var(--muted)}.library-main{max-width:1120px;margin:0 auto;padding:0 30px;min-height:calc(100dvh - 170px)}.welcome-grid{display:grid;grid-template-columns:1fr 310px;gap:65px;align-items:center;padding:65px 0 53px}.eyebrow{font-size:9px;letter-spacing:1.6px;color:var(--muted);font-weight:550}.welcome-copy>.eyebrow{display:flex;align-items:center;gap:7px}.small-dot{width:5px;height:5px;background:var(--green);border-radius:50%}h1{font-family:Georgia,'Times New Roman',serif;font-size:49px;line-height:1.15;letter-spacing:-1.8px;font-weight:400;margin:17px 0 19px}.welcome-copy>p{font-size:13px;line-height:1.9;color:var(--muted);margin:0}.continue-card{border:1px solid var(--border);border-radius:12px;padding:22px 24px;background:#fcfdfb;position:relative}.continue-card:before{content:'';position:absolute;left:24px;top:0;width:36px;height:2px;background:var(--green)}.continue-card .eyebrow{font-size:8px;letter-spacing:1.3px}.continue-subject{font-size:10px;color:var(--muted);margin:18px 0 7px}.continue-card h2{font-family:Georgia,'Times New Roman',serif;font-size:23px;line-height:1.2;font-weight:400;letter-spacing:-.5px;margin:0 0 12px}.continue-card .position-label{font-size:10px;color:var(--muted);display:flex;justify-content:space-between;gap:10px}.position-track{height:3px;background:#e7eeea;border-radius:2px;overflow:hidden;margin:9px 0 19px}.position-track>span{height:100%;display:block;background:var(--green)}.continue-link{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--border);padding-top:14px;font-size:11px;color:var(--green)}.continue-link:hover{color:#155447}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:22px}.section-heading h2{font-family:Georgia,'Times New Roman',serif;font-size:28px;letter-spacing:-.6px;font-weight:400;margin:8px 0 0}.collection-count{font-size:10px;color:var(--muted);margin-bottom:4px}.browse-toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:21px}.library-search{display:flex;align-items:center;gap:9px;border:1px solid var(--border);border-radius:7px;padding:8px 11px;width:340px;background:#fff}.library-search svg{width:15px;height:15px;fill:none;stroke:#84918b;stroke-width:1.5;flex-shrink:0}.library-search input{font-size:11px;line-height:1.6;border:0;outline:none;min-width:0;flex:1;color:var(--text);background:transparent}.library-search kbd{border:1px solid var(--border);border-radius:3px;padding:1px 4px;font-size:10px;color:#8a938e}.filters{display:flex;align-items:center;gap:6px}.filters button{border:0;background:transparent;color:var(--muted);font-size:10px;padding:7px 11px;border-radius:5px}.filters button[aria-pressed=true]{background:#f0f5f2;color:var(--green)}.subjects-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.subject-card{border:1px solid var(--border);border-radius:10px;position:relative;transition:border-color .15s,transform .15s;overflow:hidden}.subject-card>a{display:flex;flex-direction:column;min-height:245px;height:100%;padding:24px}.subject-card:hover{border-color:#b9cfc5;transform:translateY(-2px)}.card-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}.subject-icon{width:49px;height:49px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:var(--tint);color:var(--accent)}.subject-icon svg{width:33px;height:33px;fill:none;stroke:currentColor;stroke-width:1.2;stroke-linejoin:round;stroke-linecap:round}.card-index{font-size:9px;letter-spacing:1px;color:#a3ada6}.subject-card h3{font-family:Georgia,'Times New Roman',serif;font-size:22px;line-height:1.25;letter-spacing:-.4px;font-weight:400;margin:0 0 9px}.subject-card p{font-size:11px;line-height:1.8;color:var(--muted);margin:0 0 18px;max-width:260px}.card-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--border);padding-top:13px;margin-top:auto;font-size:9px;color:#929b95;gap:8px}.card-footer .card-arrow{font-size:16px;color:#a9b2ac}.subject-card.available{border-color:#c8ded3}.subject-card.available .card-footer{color:var(--green)}.subject-card.available .card-arrow{color:var(--green)}.ready-dot{width:4px;height:4px;background:var(--green);border-radius:50%;display:inline-block;margin-right:5px;vertical-align:middle}.card-lesson{font-size:10px;color:var(--green);margin:0 0 12px}.collection-note{display:flex;align-items:center;gap:12px;margin:28px 0 38px;padding:17px 0;border-top:1px solid var(--border);color:var(--muted)}.note-mark{font-size:22px;color:#99ada1;font-weight:300}.collection-note p{font-size:11px;line-height:1.8;margin:0}.collection-note p span{display:block;font-size:10px;color:#8c9790}.library-footer{max-width:1120px;margin:0 auto;padding:23px 30px 28px;border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:15px;font-size:10px;color:#8b958e}.footer-dot{margin:0 6px}.search-empty{text-align:center;border:1px dashed var(--border);border-radius:9px;padding:40px}.search-empty h3{font-family:Georgia,serif;font-weight:400;font-size:23px}.search-empty p{font-size:12px;color:var(--muted)}.search-empty button{font-size:11px;border:1px solid var(--border);border-radius:5px;background:#fff;padding:8px 12px;color:var(--green)}.back-link{font-size:11px;color:var(--muted);display:inline-flex;align-items:center;gap:7px;margin-bottom:35px}.back-link:hover{color:var(--green)}#subject-view,#not-found{padding-top:39px;padding-bottom:70px}.subject-hero{display:flex;align-items:center;justify-content:space-between;gap:35px;padding-bottom:35px;border-bottom:1px solid var(--border);margin-bottom:30px}.subject-hero h1{font-size:43px;max-width:680px;margin:12px 0 13px}.subject-hero p{color:var(--muted);font-size:13px;line-height:1.8;max-width:550px;margin:0}.subject-hero .subject-icon{height:106px;width:106px;border-radius:22px;flex-shrink:0;margin-right:16px}.subject-hero .subject-icon svg{height:69px;width:69px}.chapter-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:0 0 16px}.chapter-heading h2{font-size:25px;font-family:Georgia,serif;font-weight:400;letter-spacing:-.4px;margin:0}.chapter-heading span{font-size:10px;color:var(--muted)}.lesson-row{border:1px solid var(--border);border-radius:10px;overflow:hidden}.lesson-row>a{padding:27px;display:grid;grid-template-columns:48px 1fr 120px;gap:22px;align-items:center}.lesson-number{font-family:Georgia,serif;font-size:30px;font-weight:400;color:#9cb5a6;align-self:start;margin-top:5px}.lesson-row .eyebrow{font-size:8px;color:var(--green)}.lesson-row h3{font-family:Georgia,serif;font-weight:400;letter-spacing:-.4px;font-size:27px;margin:7px 0 9px}.lesson-row p{font-size:12px;line-height:1.8;color:var(--muted);margin:0;max-width:610px}.lesson-meta{display:flex;gap:14px;margin-top:14px;font-size:10px;color:#89978d}.lesson-cta{border:1px solid #c8ded3;border-radius:6px;padding:10px 12px;color:var(--green);text-align:center;font-size:11px;background:#f7fbf8;white-space:nowrap}.lesson-row:hover{border-color:#a8c7b5}.lesson-resume{border-top:1px solid var(--border);margin:0 27px;padding:13px 0;font-size:10px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;gap:15px}.lesson-resume a{color:var(--green)}.subject-empty{padding:50px 25px;text-align:center;border:1px dashed #dce5df;border-radius:10px;max-width:100%;margin:0 auto}.empty-book{width:45px;height:45px;margin:0 auto 15px;color:#93a99c}.empty-book svg{width:100%;height:100%;stroke:currentColor;fill:none;stroke-width:1.1}.subject-empty h2{font-family:Georgia,serif;font-weight:400;font-size:27px;letter-spacing:-.5px;margin:0 0 13px}.subject-empty p{font-size:12px;line-height:1.9;color:var(--muted);max-width:390px;margin:0 auto}.empty-status{display:inline-block;margin-top:22px;font-size:9px;color:#8c9890;background:#f5f7f5;border-radius:20px;padding:6px 11px}.subject-footer-note{font-size:11px;color:var(--muted);margin:22px 0;line-height:1.8}.noscript{padding:20px;text-align:center;font-size:13px}
@media(min-width:1500px){.library-main{max-width:1190px}.library-footer{max-width:1190px}.welcome-grid{padding-top:76px;padding-bottom:63px}.subject-card>a{min-height:255px;padding:25px 27px}}
@media(max-width:1000px){.site-header{padding:0 30px;gap:40px}.welcome-grid{gap:35px;grid-template-columns:1fr 280px;padding-top:48px}h1{font-size:42px}.subjects-grid{gap:13px}.subject-card>a{padding:21px;min-height:260px}.subject-card h3{font-size:21px}.header-note{display:none}.site-header nav{margin-left:auto}.subject-hero h1{font-size:38px}}
@media(max-width:740px){.site-header{height:68px;padding:0 23px;gap:20px}.library-brand{font-size:21px;gap:8px}.library-brand img{height:24px;width:24px}.site-header nav{gap:20px;font-size:11px}.library-main{padding:0 24px}.welcome-grid{grid-template-columns:1fr 235px;gap:25px;padding:40px 0 35px}h1{font-size:35px;letter-spacing:-1px}.welcome-copy>p{font-size:12px}.welcome-copy>p br{display:none}.continue-card{padding:19px}.continue-card h2{font-size:21px}.subjects-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.subject-card>a{min-height:240px}.subject-icon{height:44px;width:44px}.collection-count{font-size:9px}.section-heading h2{font-size:26px}.library-footer{padding-left:24px;padding-right:24px}.subject-hero h1{font-size:35px}.subject-hero .subject-icon{height:82px;width:82px;margin-right:0}.subject-hero .subject-icon svg{height:55px;width:55px}.lesson-row>a{grid-template-columns:30px 1fr;gap:15px;padding:23px}.lesson-cta{grid-column:2;justify-self:start}.lesson-row h3{font-size:25px}}
@media(max-width:520px){.site-header{padding:0 20px;height:64px}.site-header nav #subjects-nav{display:none}.site-header nav{font-size:10px}.library-brand{font-size:21px}.library-main{padding:0 22px}.welcome-grid{grid-template-columns:1fr;padding:35px 0 32px;gap:27px}h1{font-size:39px;margin-top:16px}.welcome-copy>p{font-size:12px}.welcome-copy .eyebrow{font-size:8px;letter-spacing:1.3px}.continue-card{padding:19px 21px}.continue-card .continue-subject{margin-top:13px}.continue-card h2{font-size:24px;margin-bottom:11px}.continue-card .position-track{margin-bottom:12px}.continue-link{padding-top:11px}.section-heading{align-items:start;margin-bottom:19px}.section-heading h2{font-size:27px}.collection-count{font-size:9px;line-height:1.8;text-align:right;max-width:84px;margin-top:17px}.browse-toolbar{flex-direction:column;align-items:stretch;gap:12px}.library-search{width:100%;padding:9px 11px}.library-search input{font-size:12px}.filters{gap:4px}.filters button{font-size:11px}.subjects-grid{grid-template-columns:1fr;gap:13px}.subject-card>a{padding:23px;min-height:215px}.subject-card h3{font-size:25px}.subject-card p{max-width:none;font-size:12px}.card-top{margin-bottom:16px}.subject-icon{width:45px;height:45px}.card-footer{font-size:10px}.collection-note{align-items:flex-start;margin-bottom:22px}.library-footer{padding:20px 22px 26px;flex-direction:column;gap:8px;font-size:9px}.subject-hero{align-items:start;gap:15px;padding-bottom:28px;margin-bottom:27px}.subject-hero h1{font-size:34px;line-height:1.2}.subject-hero .subject-icon{height:53px;width:53px;border-radius:12px;margin-top:29px}.subject-hero .subject-icon svg{height:36px;width:36px}.subject-hero p{font-size:12px}.subject-hero>.subject-icon{display:none}#subject-view{padding-top:28px}.back-link{margin-bottom:26px}.lesson-row>a{padding:22px 19px;gap:13px}.lesson-meta{flex-wrap:wrap;gap:6px 12px}.lesson-resume{margin:0 20px;font-size:10px;flex-wrap:wrap}.subject-empty{padding:39px 20px}.subject-empty h2{font-size:25px}.subject-empty p{font-size:12px}.chapter-heading h2{font-size:23px}.chapter-heading span{font-size:9px}}
.library-brand{white-space:nowrap}.library-footer{flex-wrap:wrap;line-height:1.8}.library-footer a:hover{color:var(--green)}.creator-credit a{color:#59685f}.creator-credit a span{white-space:nowrap}.about-main{max-width:880px;padding-top:39px;padding-bottom:65px}.about-main h1{font-size:54px}.about-intro{font-size:15px;line-height:1.9;color:var(--muted);max-width:650px}.about-creator{border-top:1px solid var(--border);margin-top:38px;padding:32px 0 22px}.about-creator h2{font-family:Georgia,serif;font-size:32px;line-height:1.35;font-weight:400;letter-spacing:-.5px;margin:14px 0}.about-creator h2 span{font-size:22px;color:var(--green);white-space:nowrap}.about-creator p,.contact-intro{font-size:13px;line-height:1.9;color:var(--muted);max-width:640px}.contact-heading{font-family:Georgia,serif;font-weight:400;font-size:28px;margin-bottom:8px}.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0 32px}.contact-card{border:1px solid var(--border);border-radius:10px;padding:23px;display:flex;flex-direction:column;gap:14px;min-width:0;font-size:13px;overflow-wrap:anywhere}.contact-card:hover{border-color:#b9cfc5}.contact-action{color:var(--green);font-size:11px}.about-note{border-top:1px solid var(--border);padding-top:23px;font-size:11px;line-height:1.9;color:var(--muted)}
@media(max-width:520px){.site-header nav #header-resume{display:none}.about-main{padding-top:28px;padding-bottom:35px}.about-main h1{font-size:39px}.about-intro{font-size:13px}.about-creator h2{font-size:28px}.about-creator h2 span{display:block;font-size:21px;margin-top:6px}.contact-grid{grid-template-columns:1fr}.contact-card{padding:21px}.creator-credit{max-width:100%}}
.card-lecturer{font-size:10px;line-height:1.5;color:#58665f;margin:-2px 0 9px}.card-lecturer span,.subject-lecturer span{font-size:8px;letter-spacing:1.1px;text-transform:uppercase;color:#98a29c;margin-right:6px}.subject-lecturer{font-size:12px;color:var(--green);margin:-4px 0 11px}.lesson-lecturer{font-size:10px;color:#7a8880;margin:-3px 0 9px}.lesson-lecturer strong{font-weight:500;color:#50645a}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}