@font-face{font-family:Inter;src:url('https://thestudyfix.com/fonts/inter-var.woff2') format('woff2');font-weight:100 900;font-display:swap}
@font-face{font-family:Newsreader;src:url('https://thestudyfix.com/fonts/newsreader-var.woff2') format('woff2');font-weight:200 900;font-display:swap}
:root{--bg:#F4F6F9;--surface:#FFFFFF;--subtle:#EDF1F5;--border:#DCE2E9;--text:#18222D;--muted:#64707E;--accent:#345D8A;--primary:#0C2F51;--on-primary:#EEF8FF}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif;font-size:16px;line-height:1.55}
a{color:inherit}
button,input{font:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.skip-link{position:absolute;left:16px;top:-80px;background:var(--primary);color:var(--on-primary);padding:10px 16px;z-index:20}
.skip-link:focus{top:10px}
.site-header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,4vw,64px);border-bottom:1px solid var(--border);background:var(--surface)}
.brand{display:inline-flex;gap:10px;align-items:baseline;text-decoration:none;color:var(--accent);font-weight:800;font-size:21px;letter-spacing:-.025em}
.brand span{color:var(--text);font-weight:500;font-size:15px;letter-spacing:0}
.main-nav{display:flex;align-items:center;gap:6px;height:100%}
.main-nav a{display:flex;align-items:center;height:100%;padding:0 16px;border-bottom:3px solid transparent;color:var(--muted);text-decoration:none;font-size:14px;font-weight:650}
.main-nav a:hover{color:var(--primary)}
.main-nav a[aria-current="page"]{color:var(--primary);border-bottom-color:var(--accent)}
.free-label{border:1px solid var(--border);background:var(--subtle);border-radius:5px;color:var(--muted);padding:4px 10px;font-size:12px;font-weight:600}
.download-main{max-width:1120px;min-height:calc(100vh - 160px);margin:0 auto;padding:clamp(60px,8vw,110px) 24px 120px}
.download-main h1{font-family:Newsreader,Georgia,serif;font-size:clamp(48px,6vw,82px);font-weight:500;line-height:1.03;letter-spacing:-.035em;margin:0 0 20px}
.download-intro{font-size:18px;color:var(--muted);margin:0 0 55px}
.download-panel{display:flex;align-items:center;justify-content:space-between;gap:28px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:clamp(26px,4vw,48px)}
.download-panel h2{font-family:Newsreader,Georgia,serif;font-size:32px;font-weight:500;letter-spacing:-.025em;margin:0 0 6px}
.download-panel p{color:var(--muted);margin:0}
.download-button{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:12px 22px;border-radius:6px;background:var(--primary);color:var(--on-primary);font-size:14px;font-weight:700;text-align:center;text-decoration:none;white-space:nowrap}
.download-button:hover{background:#17456e}
.download-pending{font-size:14px}
.intro{background:var(--surface);border-bottom:1px solid var(--border);padding:clamp(48px,6vw,76px) clamp(20px,7vw,112px) clamp(50px,6vw,80px);display:grid;grid-template-columns:minmax(0,850px) minmax(150px,270px);gap:clamp(32px,7vw,110px);align-items:end}
.intro h1{font-family:Newsreader,Georgia,serif;font-size:clamp(46px,6vw,88px);line-height:1.01;letter-spacing:-.036em;font-weight:500;max-width:900px;margin:0 0 26px;text-wrap:balance}
.intro>div>p{font-size:clamp(17px,1.5vw,20px);line-height:1.55;max-width:630px;color:var(--muted);margin:0}
.intro-aside{padding:0 0 8px;align-self:end}
.intro-aside .aside-rule{display:block;height:2px;width:46px;background:var(--accent);margin-bottom:14px}
.intro-aside p{font-family:Newsreader,Georgia,serif;font-size:24px;line-height:1.15;color:var(--accent);margin:0}
.library-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:clamp(30px,5vw,80px);max-width:1540px;margin:auto;padding:65px clamp(20px,4vw,64px) 120px}
.subjects{align-self:start;position:sticky;top:24px;max-height:calc(100vh - 48px);overflow:auto;scrollbar-width:thin;padding-right:12px;min-width:0}
.subjects h2{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;font-weight:700;margin:0 0 18px}
.subjects nav{display:grid;gap:2px}
.tree-group{display:grid;gap:2px;padding:0 0 14px 10px;border-left:1px solid var(--border)}
.tree-group+.tree-group{margin-top:10px}
.tree-heading{margin:0 0 2px -10px;padding:4px 0 4px 10px;color:var(--primary);font-size:14px;font-weight:700}
.subjects a{display:flex;align-items:baseline;justify-content:space-between;gap:14px;text-decoration:none;padding:7px 11px;border-radius:6px;border:1px solid transparent;font-size:14px;color:var(--muted)}
.subjects a:hover,.subjects a.active{color:var(--primary);background:var(--surface);border-color:var(--border)}
.subjects a span{font-size:11px;color:var(--muted)}
.catalog{min-width:0}
.catalog-top{display:flex;justify-content:space-between;align-items:end;gap:24px;padding-bottom:28px;border-bottom:1px solid var(--border)}
.catalog-top h2{font-family:Newsreader,Georgia,serif;font-size:39px;letter-spacing:-.03em;font-weight:500;line-height:1.1;margin:0 0 5px}
.catalog-top p{color:var(--muted);margin:0}
.search-label{display:grid;gap:7px;width:min(100%,320px);font-size:12px;font-weight:700;color:var(--muted)}
.search-label input{width:100%;min-height:44px;border:1px solid #C3CBD5;background:var(--surface);border-radius:6px;padding:9px 12px;color:var(--text);font-size:14px;font-weight:400}
.search-label input::placeholder{color:var(--muted)}
.result-count{min-height:19px;color:var(--muted);font-size:12px;margin:12px 0 0}
.shared-section,.module-section{scroll-margin-top:25px}
.shared-section{padding:8px 0 48px;border-bottom:1px solid var(--border)}
.module-section{padding-top:55px}
.shared-section h2,.module-section>h2{font-family:Newsreader,Georgia,serif;font-size:38px;line-height:1.1;letter-spacing:-.03em;font-weight:500;margin:0 0 12px}
.subject-section{scroll-margin-top:25px;padding-top:30px}
.subject-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:14px}
.subject-heading h3{font-family:Newsreader,Georgia,serif;font-weight:500;font-size:31px;line-height:1.1;letter-spacing:-.025em;margin:0}
.subject-heading span{font-size:12px;color:var(--muted);white-space:nowrap}
.resource-list{border-top:1px solid var(--border)}
.resource-row{display:grid;grid-template-columns:125px minmax(0,1fr) 32px;gap:16px;align-items:center;min-height:68px;text-decoration:none;border-bottom:1px solid var(--border);padding:10px 10px 10px 0;transition:background .18s ease}
.resource-row:hover{background:var(--surface)}
.row-type{font-size:12px;color:var(--accent);font-weight:700}
.row-title{font-size:15px;font-weight:550}
.row-arrow{text-align:right;font-size:20px;color:var(--accent)}
.empty-state{background:var(--surface);border:1px solid var(--border);padding:28px;margin-top:35px;border-radius:8px;color:var(--muted)}
.site-footer{display:flex;justify-content:space-between;gap:28px;padding:27px clamp(20px,4vw,64px);background:var(--primary);color:var(--on-primary);font-size:12px}
.site-footer span:last-child{color:#ADC0D6}
.reading-page{background:var(--bg)}
.back-link{font-size:14px;color:var(--accent);text-decoration:none;font-weight:600}
.back-link:hover{text-decoration:underline}
.reading{max-width:880px;margin:0 auto;padding:75px 24px 120px}
.type-label{font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0 0 18px}
.reading h1{font-family:Newsreader,Georgia,serif;font-size:clamp(40px,5vw,68px);line-height:1.05;font-weight:500;letter-spacing:-.035em;margin:0 0 17px}
.reading-intro{font-size:16px;color:var(--muted);max-width:65ch;margin:0 0 45px}
.sheet-body{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:clamp(22px,4vw,54px);font-size:15px;line-height:1.7}
.sheet-body h2,.sheet-body h3,.sheet-body h4{scroll-margin-top:20px;line-height:1.18;margin:46px 0 17px}
.sheet-body h2{font-family:Newsreader,Georgia,serif;font-size:30px;font-weight:500;letter-spacing:-.02em}
.sheet-body h3{font-size:21px}
.sheet-body h4{font-size:17px}
.sheet-body p{margin:0 0 17px}
.sheet-body ul,.sheet-body ol{padding-left:24px;margin:0 0 24px}
.sheet-body li{margin-bottom:8px}
.sheet-body strong{font-weight:700}
.sheet-body code{white-space:normal;background:var(--subtle);padding:2px 4px;border-radius:3px}
.table-wrap{overflow-x:auto;margin:10px 0 26px}
.sheet-body table{width:100%;border-collapse:collapse;min-width:560px;font-size:14px}
.sheet-body td{border-bottom:1px solid var(--border);padding:12px 13px 12px 0;vertical-align:top}
.sheet-body tr:first-child td{color:var(--accent);font-weight:700;border-bottom:2px solid var(--border)}
.flashcard-reading{max-width:900px}
.card-progress{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:30px 0 12px;color:var(--muted);font-size:13px}
.card-progress button{border:0;background:transparent;color:var(--accent);padding:8px 2px;font-size:13px;font-weight:650;cursor:pointer}
.card-progress button:hover{text-decoration:underline}
.flashcard{min-height:350px;border:1px solid var(--border);border-radius:10px;background:var(--surface);padding:clamp(24px,4vw,46px);box-shadow:0 12px 30px rgba(12,47,81,.06)}
.flashcard-prompt{color:var(--muted);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.09em;margin:0 0 28px}
.flashcard-question{font-family:Newsreader,Georgia,serif;font-size:clamp(22px,3vw,32px);line-height:1.3;overflow-wrap:anywhere;white-space:pre-wrap;margin:0}
.flashcard-answer{border-top:1px solid var(--border);margin-top:30px;padding-top:25px}
.flashcard-answer span{display:block;color:var(--accent);font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.09em;margin-bottom:10px}
.flashcard-answer p{margin:0;font-size:19px;line-height:1.5;white-space:pre-wrap;overflow-wrap:anywhere}
.card-actions{display:flex;gap:10px;margin-top:20px}
.card-actions button{border-radius:6px;min-height:46px;padding:10px 18px;font-size:14px;font-weight:700;cursor:pointer}
.primary-button{background:var(--primary);border:1px solid var(--primary);color:var(--on-primary)}
.primary-button:hover{background:#17456e}
.primary-button:disabled{opacity:.45;cursor:default}
.secondary-button{background:var(--surface);border:1px solid #C3CBD5;color:var(--primary)}
.secondary-button:hover{background:var(--subtle)}
.keyboard-tip{font-size:12px;color:var(--muted);margin-top:15px}
@media(max-width:900px){.intro{grid-template-columns:1fr}.intro-aside{max-width:380px}.library-layout{grid-template-columns:minmax(0,1fr);gap:38px}.subjects{position:static;max-height:300px;padding:0 8px 0 0;overflow:auto}.subjects nav{grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:12px}.tree-group+.tree-group{margin-top:0}.catalog-top{align-items:start}}
@media(max-width:620px){.site-header{height:64px}.brand{display:grid;gap:0;font-size:17px;line-height:1.05}.brand span{font-size:12px}.main-nav a{padding:0 9px;font-size:12px}.intro{padding:50px 20px 58px}.intro h1{font-size:49px}.intro-aside{display:none}.library-layout{padding:40px 20px 85px}.subjects nav{grid-template-columns:repeat(2,minmax(0,1fr))}.subjects a{font-size:13px;gap:6px}.catalog-top{display:grid}.search-label{width:100%}.subject-section{padding-top:28px}.resource-row{grid-template-columns:minmax(0,1fr) 24px;gap:7px}.row-type{grid-column:1;grid-row:1}.row-title{grid-column:1;grid-row:2}.row-arrow{grid-column:2;grid-row:1 / span 2}.download-main{padding:58px 20px 80px}.download-panel{align-items:stretch;flex-direction:column}.download-button{white-space:normal}.site-footer{display:grid}.reading{padding-top:48px}.sheet-body{border-radius:7px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.resource-row{transition:none}}
.download-secondary{margin-top:18px;padding:clamp(18px,3vw,30px)}.download-secondary h2{font-size:22px}.download-secondary .download-button{background:transparent;color:var(--primary);border:1px solid var(--border)}.download-secondary .download-button:hover{background:var(--surface)}
.download-panel p+p{margin-top:6px}