@font-face{font-family:StudySans;src:url('/assets/fonts/BeVietnamPro-Regular.ttf') format('truetype');font-style:normal;font-weight:400;font-display:swap}
@font-face{font-family:StudySans;src:url('/assets/fonts/BeVietnamPro-SemiBold.ttf') format('truetype');font-style:normal;font-weight:600 800;font-display:swap}
:root{--bg:#f5f3ec;--paper:#fffef9;--ink:#203b35;--muted:#65726b;--line:#ddded3;--accent:#146855;--soft:#e8ede1;--reading-size:18px;--sidebar:274px;--top:72px;color-scheme:light}
:root[data-theme=dark]{--bg:#14211e;--paper:#1c2b26;--ink:#e4eddf;--muted:#a9b8ad;--line:#35483e;--accent:#a8d6b3;--soft:#2b3e30;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;background:var(--bg);color:var(--ink);font-family:StudySans,system-ui,-apple-system,sans-serif;font-size:15px;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.6}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #ce9c42;outline-offset:3px}button{border:0}img,svg{max-width:100%}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:600;line-height:1.3;letter-spacing:-.035em}h1{font-size:42px}h2{font-size:26px}h3{font-size:20px}p{color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:.18em;font-weight:600;color:var(--muted)}.topbar{position:fixed;inset:0 0 auto;height:var(--top);border-bottom:1px solid var(--line);background:var(--bg);z-index:40;display:flex;align-items:center;padding:0 30px;gap:22px}.brand{display:flex;align-items:center;gap:11px;font-size:20px;font-weight:600;white-space:nowrap;letter-spacing:-.05em}.brand-mark{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--ink);width:32px;height:32px;border-radius:9px;font-family:Georgia,serif;letter-spacing:-.18em;padding-right:5px;font-size:25px}.brand-mark span{color:var(--accent)}.brand-light{color:var(--muted);font-weight:400}.top-note{font-size:9px;letter-spacing:.17em;color:var(--muted);margin-left:40px}.top-actions{margin-left:auto;display:flex;align-items:center;gap:15px}.icon-btn{background:transparent;border-radius:8px;min-width:40px;height:40px;font-size:23px}.icon-btn:hover{background:var(--soft)}.search-trigger{border:1px solid var(--line);border-radius:8px;background:var(--paper);display:flex;align-items:center;gap:12px;padding:7px 12px;color:var(--muted);font-size:12px}.search-trigger>span:first-child{font-size:23px;line-height:1}.search-trigger kbd{margin-left:30px;border:1px solid var(--line);padding:0 5px;font-size:10px;border-radius:3px}.mobile-menu{display:none}.sidebar{position:fixed;top:var(--top);bottom:0;width:var(--sidebar);border-right:1px solid var(--line);overflow:auto;padding:30px 21px 22px;z-index:35;background:var(--bg);scrollbar-width:thin}.side-top{display:flex;flex-direction:column;gap:4px;margin-bottom:24px}.side-top>.eyebrow{margin-bottom:15px}.side-home{font-size:13px;display:flex;align-items:center;justify-content:space-between;padding:6px 10px}.side-home:hover{background:var(--soft);border-radius:7px}.side-home span{color:var(--muted)}.nav-caption{font-size:9px;letter-spacing:.16em;color:var(--muted);margin:0 10px 15px}.nav-layer{margin-bottom:10px}.nav-layer>summary{display:flex;gap:10px;align-items:center;font-size:12px;font-weight:600;list-style:none;cursor:pointer;padding:9px 4px}.nav-layer>summary::-webkit-details-marker{display:none}.nav-layer>summary:after{content:'+';color:var(--muted);margin-left:auto;font-weight:400}.nav-layer[open]>summary:after{content:'−'}.layer-dot{display:inline-flex;align-items:center;justify-content:center;width:25px;height:25px;flex-shrink:0;border-radius:7px;font-size:10px;background:#dce9df;color:#325749}.teal{--card-accent:#308777;--card-soft:#dfede5}.blue{--card-accent:#4d7d95;--card-soft:#e0eaf0}.violet{--card-accent:#7a739d;--card-soft:#e9e6f0}.amber{--card-accent:#a17b3d;--card-soft:#f0e8d8}.pink{--card-accent:#aa7273;--card-soft:#f1e3e2}.green{--card-accent:#78844a;--card-soft:#e8ecd9}.layer-dot.teal,.layer-dot.blue,.layer-dot.violet,.layer-dot.amber,.layer-dot.pink,.layer-dot.green{background:var(--card-soft);color:var(--card-accent)}.nav-lesson,.nav-start,.nav-extra{font-size:11px;line-height:1.5;display:flex;gap:7px;padding:8px 6px 8px 11px;margin:2px 0 2px 14px;border-left:1px solid var(--line);color:var(--muted)}.nav-lesson span{font-size:9px;min-width:14px;padding-top:2px;color:var(--muted)}.nav-lesson.active,.nav-start.active{background:var(--soft);border-left:2px solid var(--accent);color:var(--ink);border-radius:0 5px 5px 0}.nav-lesson:hover,.nav-start:hover,.nav-extra:hover{color:var(--accent)}.nav-extra{font-size:10px}.read-dot{flex-shrink:0;margin:auto 0 auto auto;width:5px;height:5px;border-radius:50%}.nav-lesson.is-read .read-dot{background:var(--accent)}.side-bottom{border-top:1px solid var(--line);margin-top:22px;padding:20px 10px 0;display:flex;flex-direction:column;gap:12px}.side-bottom a{font-size:11px}.side-bottom span{font-size:9px;color:var(--muted)}.main{margin:var(--top) 0 0 var(--sidebar);padding:52px 5%;max-width:1740px;min-height:calc(100vh - 170px)}.hero{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;gap:25px;padding:20px 0 56px;border-bottom:1px solid var(--line)}.hero .eyebrow{display:flex;align-items:center;gap:7px;font-size:9px}.status-dot{width:6px;height:6px;border-radius:100%;background:#5c8d65}.hero h1{font-size:clamp(32px,3.4vw,53px);margin:23px 0;font-weight:600;line-height:1.22;letter-spacing:-.045em}.hero h1 em{font-style:normal;color:var(--accent)}.hero p{font-size:14px;line-height:1.85}.hero-actions{display:flex;gap:12px;margin:26px 0 34px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:22px;padding:12px 19px;border-radius:7px;font-size:12px;font-weight:600;border:1px solid transparent;min-height:44px;line-height:1.5}.btn.primary{background:var(--ink);color:var(--bg)}.btn.primary:hover{opacity:.88}.btn.secondary{background:transparent;border-color:var(--line);color:var(--ink)}.btn.secondary:hover{background:var(--soft)}.hero-stats{display:flex;gap:26px;font-size:10px;color:var(--muted)}.hero-stats b{font-size:22px;display:block;line-height:1.4;font-weight:600;color:var(--ink)}.hero-art{color:var(--muted);padding-top:28px}.art-caption{display:block;text-align:right;letter-spacing:.14em;line-height:1.8;font-size:8px;margin:15px 10px 0}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:34px 0 21px}.section-heading h2{font-size:25px;margin:8px 0 0}.section-heading>a{font-size:11px;color:var(--muted);white-space:nowrap}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.course-card{padding:23px 23px 17px;border:1px solid var(--line);border-radius:10px;background:var(--paper);transition:transform .18s,border-color .18s;min-width:0}.course-card:hover{transform:translateY(-3px);border-color:var(--card-accent)}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}.course-number{font-family:Georgia,serif;font-size:27px;color:var(--card-accent)}.card-arrow{border:1px solid var(--line);width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px}.course-card h3{font-size:18px;margin-bottom:9px;letter-spacing:-.02em}.course-card p{font-size:11px;line-height:1.7;min-height:38px;margin-bottom:27px}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:9px;color:var(--muted);margin-bottom:9px}.card-bottom>span:first-child{color:var(--card-accent)}.progress-track{height:3px;background:var(--line);border-radius:3px;overflow:hidden}.progress-track i{display:block;width:0;height:100%;background:var(--card-accent,var(--accent));transition:width .4s}.study-strip{display:grid;grid-template-columns:1fr 1.3fr;gap:45px;padding:35px 0 15px;margin-top:32px;border-top:1px solid var(--line);align-items:center}.study-strip h2{font-size:23px;margin:9px 0 12px}.study-strip p{font-size:12px;line-height:1.85;max-width:400px}.strip-links{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.strip-links a{border-left:1px solid var(--line);padding-left:18px;display:flex;flex-direction:column;gap:7px}.strip-links a>span{font-size:22px;color:var(--accent)}.strip-links strong{font-size:11px;font-weight:600}.strip-links small{font-size:9px;color:var(--muted)}.footer{margin-left:var(--sidebar);padding:23px 5%;display:flex;align-items:center;gap:20px;border-top:1px solid var(--line);font-size:11px}.footer>span{font-size:9px;color:var(--muted)}.footer>a{margin-left:auto;font-size:9px;color:var(--muted)}.page-head{max-width:720px;margin:0 0 36px}.page-head h1{margin:15px 0 17px;font-size:38px}.page-head p{font-size:14px;line-height:1.85}.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:9px;font-size:10px;color:var(--muted);margin-bottom:24px}.breadcrumb a:hover{color:var(--accent)}.reading-main{margin-right:225px;padding:34px 4%;max-width:1170px}.reading-wrap{max-width:830px;margin:auto}.reading-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:10px;color:var(--muted);margin-bottom:31px}.reading-tools>div{display:flex;gap:6px}.dot{margin:0 5px}.small-btn{border:1px solid var(--line);background:transparent;border-radius:6px;padding:7px 11px;font-size:11px;min-height:36px}.small-btn:hover{background:var(--soft)}.small-btn[aria-pressed=true]{background:var(--soft);color:var(--accent);border-color:var(--accent)}.prose{font-size:var(--reading-size);line-height:1.9;overflow-wrap:break-word}.prose p{color:var(--ink);margin:0 0 1.2em}.prose h1{font-size:clamp(26px,2.5vw,36px);margin:0 0 28px;line-height:1.45}.prose h2{font-size:1.38em;margin:2.2em 0 1em;padding-top:20px;border-top:1px solid var(--line);line-height:1.5}.prose h3{font-size:1.13em;line-height:1.55;margin:1.7em 0 .7em}.prose h4{font-size:1em;margin:1.4em 0 .6em}.prose a{color:var(--accent);text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--accent) 30%,transparent);text-underline-offset:3px}.prose a:hover{text-decoration-color:var(--accent)}.prose strong{font-weight:600}.prose ul,.prose ol{padding-left:1.45em;margin:0 0 1.2em}.prose li{margin:.4em 0}.prose li>p{margin-bottom:.6em}.prose blockquote{margin:1.5em 0;border-left:3px solid var(--accent);padding:13px 20px;background:var(--soft);border-radius:0 6px 6px 0}.prose blockquote p:last-child{margin-bottom:0}.prose code{font-size:.83em;font-family:Consolas,monospace;background:var(--soft);padding:.1em .3em;border-radius:4px}.prose pre{padding:20px;background:var(--soft);border:1px solid var(--line);border-radius:8px;overflow:auto;font-size:14px;line-height:1.65;white-space:pre;max-width:100%;tab-size:2}.prose pre code{padding:0;background:transparent}.prose figure{margin:25px 0}.prose figure img{display:block;border-radius:8px;border:1px solid var(--line);width:100%;height:auto;background:white}.prose figcaption{font-size:11px;color:var(--muted);margin-top:8px;line-height:1.6}.prose details{background:var(--paper);border:1px solid var(--line);border-radius:8px;margin:20px 0;padding:14px 20px}.prose summary{cursor:pointer;font-size:.9em;font-weight:600;color:var(--accent);padding:2px 0}.prose details[open]>summary{margin-bottom:18px}.prose details p:last-child{margin-bottom:0}.prose hr{border:0;border-top:1px solid var(--line);margin:2em 0}.table-scroll{overflow:auto;width:100%;margin:20px 0;border:1px solid var(--line);border-radius:8px;scrollbar-width:thin}.prose table{border-collapse:collapse;width:100%;font-size:.8em;line-height:1.65}.prose th{background:var(--soft);text-align:left;font-weight:600;vertical-align:top}.prose td,.prose th{padding:13px 15px;min-width:130px;border-bottom:1px solid var(--line)}.prose tbody tr:last-child td{border-bottom:none}.prose td+td,.prose th+th{border-left:1px solid var(--line)}.equation{overflow:auto;margin:1.5em 0;padding:5px 0;max-width:100%}.katex{font-size:1.03em}.katex-display{margin:.6em 0}.katex-display>.katex{padding:0 8px}.anchor{opacity:0;margin-left:8px;font-size:.7em;text-decoration:none!important;font-weight:400}.prose h1:hover .anchor,.prose h2:hover .anchor,.prose h3:hover .anchor,.anchor:focus{opacity:1}.desktop-toc{position:fixed;right:0;top:var(--top);bottom:0;width:225px;padding:43px 20px 30px 15px;overflow:auto;scrollbar-width:thin}.desktop-toc>.eyebrow{font-size:9px}.desktop-toc nav{margin-top:17px;display:flex;flex-direction:column}.toc-link{font-size:10px;line-height:1.6;color:var(--muted);border-left:1px solid var(--line);padding:7px 12px}.toc-link:hover,.toc-link.active{color:var(--accent);border-left-color:var(--accent)}.toc-link.depth-3{padding-left:22px;font-size:9px}.back-top{display:block;margin:22px 12px;font-size:10px;color:var(--muted)}.mobile-toc{display:none}.lesson-complete{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:48px 0 15px;padding:23px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.lesson-complete p{font-size:12px;color:var(--ink);margin:7px 0 0}.lesson-complete>.btn{font-size:10px;gap:7px}.practice-links{display:flex;gap:20px;font-size:11px;color:var(--accent);margin:15px 4px 35px}.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:32px}.pager a{border:1px solid var(--line);padding:20px;border-radius:8px;font-size:12px;line-height:1.65}.pager a:hover{background:var(--soft)}.pager small{display:block;color:var(--muted);font-size:9px;letter-spacing:.1em;margin-bottom:8px}.pager a:nth-child(2){text-align:right}.source-note{border-top:1px solid var(--line);padding-top:22px;margin-top:32px;font-size:10px;display:flex;flex-direction:column;gap:8px;color:var(--muted)}.source-note a{color:var(--accent)}#chat-reference{font-size:9px}.diagram{margin:25px 0;overflow:auto}.diagram>.mermaid{background:var(--paper);border:1px solid var(--line);padding:15px;text-align:center;white-space:pre-wrap;font-size:12px}.diagram>.mermaid svg{height:auto;max-height:none}.diagram-source{font-size:12px!important;background:transparent!important}.diagram-source summary{font-weight:400}.diagram-source pre{font-size:11px}.filter-row{display:flex;gap:15px;align-items:end;flex-wrap:wrap;margin:25px 0}.filter-row label,.practice-toolbar label{font-size:10px;color:var(--muted);display:flex;flex-direction:column;gap:7px}.filter-row .grow{flex:1}input[type=search],select{border:1px solid var(--line);border-radius:7px;padding:11px 13px;background:var(--paper);color:var(--ink);min-width:0}select{max-width:100%;font-size:12px}input[type=search]{font-size:13px}.library-group{margin:35px 0}.library-group h2{font-size:22px}.document-row{display:grid;grid-template-columns:100px 1fr 80px;align-items:center;gap:20px;border-bottom:1px solid var(--line);padding:15px 7px}.document-row:hover{background:var(--soft)}.document-row>span{font-size:8px;letter-spacing:.05em;color:var(--muted)}.document-row strong{font-size:12px;line-height:1.8;font-weight:400}.document-row>small{font-size:9px;color:var(--muted);text-align:right}.reference-files{margin-top:40px;border-top:1px solid var(--line);padding-top:30px}.reference-files p{font-size:12px}.reference-file{display:flex;justify-content:space-between;gap:15px;padding:13px 0;border-bottom:1px solid var(--line);font-size:11px;overflow-wrap:anywhere}.reference-file small{white-space:nowrap;color:var(--muted);font-size:9px}.practice-toolbar{display:flex;gap:16px;align-items:end;flex-wrap:wrap;margin-bottom:25px}.segmented{display:inline-flex;gap:3px;padding:4px;border:1px solid var(--line);border-radius:8px;background:var(--paper)}.segmented button{background:transparent;border-radius:5px;padding:10px 17px;font-size:12px;white-space:nowrap}.segmented button.active{background:var(--ink);color:var(--bg)}#practice-status{font-size:11px;color:var(--muted);margin:20px 0}.question-card,.flashcard-panel{max-width:900px;border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:32px}.question-top{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--muted);gap:15px;margin-bottom:22px}.question-card h2{font-size:23px;line-height:1.7;margin-bottom:26px;letter-spacing:-.01em}.answer-options{display:flex;flex-direction:column;gap:12px}.answer-option{display:flex;text-align:left;align-items:start;gap:14px;border:1px solid var(--line);border-radius:8px;padding:17px;background:transparent;font-size:14px;line-height:1.8;min-height:55px}.answer-option>span:first-child{display:flex;align-items:center;justify-content:center;min-width:26px;height:26px;border:1px solid var(--line);border-radius:6px;font-size:10px}.answer-option:not(:disabled):hover{background:var(--soft);border-color:var(--accent)}.answer-option.correct{background:color-mix(in srgb,var(--soft) 80%,#63c589 20%);border-color:#66976b;opacity:1}.answer-option.incorrect{background:color-mix(in srgb,var(--paper) 80%,#e5abab 20%);border-color:#bf8989;opacity:1}.answer-option:disabled{opacity:.75}.answer-explanation{border-top:1px solid var(--line);margin-top:28px;padding-top:22px;font-size:14px;line-height:1.9}.answer-explanation p{color:var(--ink)}.answer-explanation h3{font-size:18px;margin-bottom:12px}.answer-explanation a{display:inline-block;color:var(--accent);text-decoration:underline;font-size:11px;margin:8px 0}.question-nav{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:26px;padding-top:20px;border-top:1px solid var(--line)}.question-nav span{font-size:10px;color:var(--muted)}.practice-note{font-size:10px;max-width:650px;margin:25px 0}.flashcard{min-height:270px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:24px 8px}.flashcard h2{font-size:25px;line-height:1.65;max-width:650px}.flashcard .card-back{font-size:16px;line-height:1.9;max-width:700px;color:var(--ink)}.flashcard .eyebrow{margin-bottom:20px}.flashcard a{color:var(--accent);text-decoration:underline;font-size:11px;margin-top:17px}.card-review{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;border-top:1px solid var(--line);padding-top:24px}.card-review button{min-height:44px}.session-summary h2{font-size:30px;margin:20px 0}.session-summary p{font-size:15px;line-height:1.8}.session-summary .filter-row{margin-bottom:0}.metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:20px 0 32px}.metric-box{padding:22px;border:1px solid var(--line);background:var(--paper);border-radius:8px}.metric-box strong{display:block;font-size:28px;font-weight:600;line-height:1.5}.metric-box span{font-size:10px;color:var(--muted)}.data-panel{margin-top:35px;padding:27px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.data-panel h2{font-size:22px}.data-panel p{font-size:12px}.danger{color:#a55252}#progress-layers{margin-bottom:30px}.progress-row{padding:19px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 150px;gap:15px;align-items:center}.progress-row h3{font-size:16px;margin-bottom:8px}.progress-row p{font-size:10px;margin:0}.lab-card{padding:30px;border:1px solid var(--line);background:var(--paper);border-radius:12px;margin-bottom:28px}.lab-heading{display:flex;gap:15px}.lab-heading .layer-dot{margin-top:3px;width:32px;height:32px;font-size:12px}.lab-heading h2{font-size:23px;margin-bottom:10px}.lab-heading p{font-size:12px;line-height:1.9;margin-bottom:25px}.range-label{display:block;font-size:11px;color:var(--muted);margin:12px 0 20px}.range-label strong{float:right;color:var(--ink)}input[type=range]{display:block;width:100%;accent-color:var(--accent);margin-top:12px;min-height:25px}.lab-card canvas{display:block;width:100%;height:auto;background:var(--bg);border-radius:7px}.lab-answer{font-size:13px;line-height:1.9;background:var(--soft);padding:20px;border-radius:7px;margin:22px 0;color:var(--ink)}.lab-card>a{font-size:11px;color:var(--accent);text-decoration:underline}.mask-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:8px;max-width:650px;margin:27px auto}.mask-cell{aspect-ratio:1.25;border-radius:5px;background:#6ea190;display:flex;align-items:center;justify-content:center;font-size:10px;color:#fff}.mask-cell.masked{background:var(--line);color:var(--muted);border:1px dashed var(--muted)}.mask-controls{flex-wrap:wrap}.score-plot{position:relative;display:flex;flex-direction:column;gap:25px;padding:25px 10px 35px;margin:20px 0;background:var(--bg);border-radius:7px}.score-track{position:relative;height:45px;border-bottom:1px solid var(--line);margin-left:24px}.score-track>span{position:absolute;left:-22px;top:14px;font-size:11px}.score-dot{position:absolute;top:10px;width:30px;height:30px;background:#387f6b;border:2px solid transparent;color:white;border-radius:50%;transform:translateX(-50%);font-size:9px;display:flex;align-items:center;justify-content:center}.score-dot.spoof{background:#a56f72}.score-dot.rejected{opacity:.35;border:2px dashed var(--ink)}.score-cut{position:absolute;top:15px;bottom:20px;width:2px;background:var(--ink);opacity:.65;z-index:2}.score-axis{display:flex;justify-content:space-between;font-size:9px;color:var(--muted);margin-left:24px}.pipeline-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:16px 0}.pipeline-steps button{padding:18px 12px;background:var(--bg);border:1px solid var(--line);border-radius:7px;text-align:left;font-size:12px}.pipeline-steps button>small{display:block;font-size:9px;color:var(--muted);margin-bottom:8px}.pipeline-steps button.active{border-color:var(--accent);background:var(--soft)}.skip-link{position:fixed;top:-60px;left:15px;padding:10px 20px;background:var(--ink);color:var(--bg);z-index:80;border-radius:0 0 8px 8px}.skip-link:focus{top:0}dialog{border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink);padding:26px;width:min(720px,calc(100% - 30px));max-height:85vh;box-shadow:0 20px 80px #0003}dialog::backdrop{background:#07181088;backdrop-filter:blur(3px)}.dialog-title{display:flex;justify-content:space-between;gap:15px;align-items:center;font-size:13px;font-weight:600;margin-bottom:12px}#search-input{width:100%;font-size:16px}#search-status{font-size:10px;margin:16px 0}#search-results{max-height:55vh;overflow:auto}.search-result{display:block;padding:16px 10px;border-top:1px solid var(--line)}.search-result:hover{background:var(--soft)}.search-result small{display:block;font-size:9px;color:var(--muted);margin-bottom:5px}.search-result strong{font-size:13px;font-weight:600}.search-result p{font-size:11px;line-height:1.85;margin:8px 0 0}#toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);background:var(--ink);color:var(--bg);padding:12px 20px;font-size:12px;max-width:90%;border-radius:8px;opacity:0;pointer-events:none;transition:.2s;z-index:90}#toast.show{opacity:1;transform:translate(-50%,0)}[hidden]{display:none!important}
@media(min-width:1700px){.main{padding-left:75px;padding-right:75px}.reading-main{max-width:1250px}.hero h1{font-size:55px}}
@media(max-width:1250px){:root{--sidebar:244px}.top-note{display:none}.main{padding:38px 4%}.reading-main{margin-right:0}.desktop-toc{display:none}.mobile-toc{display:block;border:1px solid var(--line);border-radius:8px;padding:12px 17px;font-size:12px;margin:0 0 26px;background:var(--paper)}.mobile-toc summary{cursor:pointer;color:var(--accent)}.mobile-toc nav{display:flex;flex-direction:column;margin-top:14px;gap:9px;color:var(--muted)}.mobile-toc .depth-3{padding-left:14px;font-size:11px}.hero{grid-template-columns:1.15fr .85fr;gap:10px}.hero-stats{gap:20px}.course-card{padding:20px 18px 15px}.course-card h3{font-size:16px}.study-strip{gap:25px;grid-template-columns:1fr 1.2fr}}
@media(max-width:1000px){.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h1{font-size:44px}.course-grid{grid-template-columns:repeat(2,1fr)}.study-strip{grid-template-columns:1fr}.strip-links{margin-top:7px}.document-row{grid-template-columns:80px 1fr}.document-row small{display:none}.sidebar{padding:25px 15px}.question-card{padding:25px}.question-card h2{font-size:21px}.reading-tools{font-size:9px}.reading-tools .small-btn{font-size:10px;padding:7px 8px}}
@media(max-width:760px){:root{--top:62px;--sidebar:0px}.topbar{padding:0 16px;gap:10px}.brand{font-size:18px;gap:8px}.brand-mark{width:29px;height:29px;font-size:22px}.mobile-menu{display:block;width:32px;min-width:32px;font-size:19px}.top-actions{gap:2px}.search-trigger{padding:0;width:38px;height:38px;justify-content:center;background:transparent;border:none}.search-label,.search-trigger kbd{display:none}.icon-btn{min-width:36px;width:36px;height:36px}.sidebar{width:290px;transform:translateX(-100%);transition:transform .2s ease;padding:24px 20px;border-right:1px solid var(--line)}.sidebar.open{transform:translateX(0)}.nav-shade{display:none;position:fixed;inset:var(--top) 0 0;background:#081d1880;z-index:30}.nav-shade.open{display:block}.side-home{font-size:14px;padding:9px 7px}.nav-layer>summary{font-size:13px;padding:12px 4px}.nav-lesson,.nav-start{font-size:12px;padding:11px 6px 11px 11px}.main{margin-left:0;padding:32px 21px}.hero{padding:9px 0 36px}.hero .eyebrow{font-size:8px;letter-spacing:.13em}.hero h1{font-size:40px;margin:22px 0}.hero p{font-size:13px}.hero-actions{margin:25px 0 28px;gap:10px}.btn{padding:12px 15px;font-size:11px;gap:14px}.hero-stats{gap:32px}.hero-stats b{font-size:24px}.hero-art{display:block;padding-top:10px}.hero-art svg{max-height:190px}.art-caption{display:none}.section-heading{align-items:start;margin-top:30px;flex-direction:column;gap:10px}.section-heading h2{font-size:24px}.section-heading>a{font-size:10px}.course-grid{gap:12px}.course-card{padding:19px 15px 15px}.card-top{margin-bottom:16px}.course-number{font-size:26px}.course-card h3{font-size:17px;line-height:1.4;min-height:46px;margin-bottom:10px}.course-card p{font-size:10px;min-height:53px;margin-bottom:18px}.card-bottom{flex-direction:column;align-items:start;gap:5px;font-size:9px}.study-strip{margin-top:27px;padding-top:26px;gap:13px}.study-strip h2{font-size:23px}.strip-links{gap:8px}.strip-links a{padding-left:10px;gap:8px}.strip-links strong{font-size:11px;line-height:1.65}.strip-links small{font-size:9px}.footer{margin-left:0;padding:20px;flex-wrap:wrap;gap:6px 20px}.footer>span{width:100%;order:2}.footer>a{font-size:9px}.page-head{margin-bottom:26px}.page-head h1{font-size:32px;line-height:1.45;margin-top:12px}.page-head p{font-size:13px}.reading-main{padding:23px 20px}.breadcrumb{font-size:9px;margin-bottom:21px;gap:6px}.reading-tools{flex-wrap:wrap;margin-bottom:22px;gap:11px}.reading-tools .small-btn{font-size:10px;padding:8px 9px;min-height:36px}.reading-tools>span{font-size:10px}.prose{line-height:1.9}.prose h1{font-size:27px;line-height:1.5;margin-bottom:24px}.prose h2{font-size:1.25em}.prose h3{font-size:1.1em}.prose pre{padding:14px;font-size:12px}.prose details{padding:14px 16px}.prose th,.prose td{font-size:13px;padding:12px;min-width:135px}.prose figure{margin-left:-5px;margin-right:-5px}.prose figcaption{font-size:10px}.prose blockquote{padding:15px}.katex{font-size:.97em}.lesson-complete{flex-direction:column;align-items:start;padding:21px;margin-top:35px;gap:16px}.lesson-complete .btn{font-size:11px}.practice-links{font-size:10px;gap:20px}.pager{gap:10px}.pager a{padding:15px 13px;font-size:11px}.pager small{font-size:8px;letter-spacing:.02em}.source-note{font-size:10px}.filter-row{gap:15px}.filter-row .grow{flex-basis:100%}.filter-row input,.filter-row select{font-size:14px}.library-group h2{font-size:20px}.document-row{grid-template-columns:1fr;gap:5px;padding:17px 3px}.document-row>span{font-size:8px}.document-row strong{font-size:13px;line-height:1.8}.reference-file{font-size:10px}.practice-toolbar{gap:13px;align-items:center}.practice-toolbar>label{flex:1;min-width:140px}.practice-toolbar>.segmented{flex-basis:100%;width:100%}.practice-toolbar .segmented button{flex:1}.practice-toolbar>label{font-size:10px}.practice-toolbar select{font-size:14px;padding:10px}.practice-toolbar>.small-btn{font-size:10px;min-height:43px}.segmented button{font-size:12px;padding:10px 12px}.question-card,.flashcard-panel{padding:22px 18px;border-radius:10px}.question-top{font-size:9px;margin-bottom:18px}.question-card h2{font-size:20px;line-height:1.75;margin-bottom:23px}.answer-option{font-size:14px;line-height:1.85;padding:14px 12px;gap:10px}.answer-option>span:first-child{min-width:24px;height:24px;margin-top:3px}.answer-explanation{font-size:14px;margin-top:23px;padding-top:20px}.question-nav{gap:7px;flex-wrap:wrap}.question-nav .btn{font-size:11px}.flashcard{min-height:290px;padding:20px 4px}.flashcard h2{font-size:22px}.flashcard .card-back{font-size:16px}.card-review{gap:8px}.card-review button{font-size:11px;padding:12px}.metric-grid{gap:9px}.metric-box{padding:17px 13px}.metric-box strong{font-size:23px}.metric-box span{font-size:9px}.data-panel{padding:22px 19px}.data-panel .btn{font-size:11px}.progress-row{grid-template-columns:1fr 80px}.progress-row h3{font-size:14px}.lab-card{padding:23px 18px}.lab-heading{gap:11px}.lab-heading h2{font-size:21px}.lab-heading p{font-size:12px}.lab-heading .layer-dot{width:27px;height:27px;font-size:11px}.lab-answer{padding:16px;font-size:13px}.mask-grid{gap:5px;margin:24px 0}.mask-cell{font-size:9px}.mask-controls button{font-size:11px;padding:10px}.pipeline-steps{grid-template-columns:repeat(2,1fr)}.pipeline-steps button{padding:14px 11px;font-size:12px}.score-dot{width:26px;height:26px;font-size:8px}.score-track{margin-left:20px}.lab-card .metric-box strong{font-size:21px}dialog{padding:20px 17px}.dialog-title{font-size:12px}#search-input{font-size:16px}.search-result strong{font-size:13px}.search-result p{font-size:12px;line-height:1.8}.search-result{padding:15px 5px}#toast{font-size:11px;padding:12px 15px;bottom:20px}.source-note span{overflow-wrap:anywhere}}
@media(max-width:359px){.main{padding-left:16px;padding-right:16px}.hero h1{font-size:35px}.hero-stats{gap:22px}.course-card{padding:17px 12px}.course-card h3{font-size:15px}.brand{font-size:16px}.brand-mark{display:none}.hero-actions .btn{padding:12px;font-size:10px}.reading-main{padding-left:16px;padding-right:16px}.question-card{padding:20px 14px}}
@media(max-width:760px){.question-nav .btn{margin-left:auto}.question-nav>span{order:3;flex-basis:100%;text-align:center;margin-top:7px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{.topbar,.sidebar,.footer,.desktop-toc,.reading-tools,.mobile-toc,.lesson-complete,.practice-links,.pager,.source-note,dialog,#toast{display:none!important}.main,.reading-main{margin:0;padding:0;max-width:none}.prose{font-size:11pt;color:#000}.prose details{display:block}.prose details>*{display:block!important}body{background:white;color:black}.prose p{color:black}.prose a{color:black}.table-scroll,.equation{overflow:visible}.prose pre{white-space:pre-wrap}.prose h2{break-after:avoid}.prose figure{break-inside:avoid}}