:root{--bg: #f7f6f3;--surface: #ffffff;--surface-alt: #f0efe9;--border: #ddd9d0;--text: #24211c;--text-muted: #6b6558;--text-faint: #706a5c;--on-accent: #ffffff;--accent: #8a4a2f;--accent-hover: #6f3b25;--accent-soft: #f1e4da;--success: #3a6b4a;--danger: #9a3b3b;--focus: #2f5f8a;--radius: 6px;--base-font-size: 15px;--serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;color-scheme:light}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #171613;--surface: #201f1b;--surface-alt: #262420;--border: #3a372f;--text: #eae7df;--text-muted: #b0aa98;--text-faint: #97917f;--on-accent: #1a1510;--accent: #d08a5e;--accent-hover: #e0a077;--accent-soft: #332821;--success: #7fb894;--danger: #d68080;--focus: #7fa8cc;color-scheme:dark}}:root[data-theme=dark]{--bg: #171613;--surface: #201f1b;--surface-alt: #262420;--border: #3a372f;--text: #eae7df;--text-muted: #b0aa98;--text-faint: #97917f;--on-accent: #1a1510;--accent: #d08a5e;--accent-hover: #e0a077;--accent-soft: #332821;--success: #7fb894;--danger: #d68080;--focus: #7fa8cc;color-scheme:dark}body.a11y-dyslexia{font-family:Verdana,Tahoma,Geneva,sans-serif!important;letter-spacing:0.02em;line-height:1.75}body.a11y-dyslexia .brand,body.a11y-dyslexia h1,body.a11y-dyslexia .subject-heading,body.a11y-dyslexia .department-heading{font-family:Verdana,Tahoma,Geneva,sans-serif!important}body.a11y-contrast{--bg: #ffffff;--surface: #ffffff;--surface-alt: #f0f0f0;--border: #000000;--text: #000000;--text-muted: #000000;--text-faint: #222222;--on-accent: #ffffff;--accent: #7a1f00;--accent-hover: #5c1700;--accent-soft: #ffe6d9;--success: #0a5c1f;--danger: #7a0000;--focus: #00337a}body.a11y-contrast .topic-card,body.a11y-contrast .item-row,body.a11y-contrast .controls-bar,body.a11y-contrast .flashcard{border-width:2px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:var(--base-font-size);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1100px;margin:0 auto;padding:0 24px 64px}header.site-header{border-bottom:1px solid var(--border);background:var(--surface);margin-bottom:32px}.site-header .wrap{padding-top:20px;padding-bottom:20px;display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{font-family:var(--serif);font-size:22px;font-weight:600;letter-spacing:0.2px;color:var(--text)}.brand a{color:inherit}.brand a:hover{text-decoration:none;opacity:0.85}.version-badge{font-family:var(--mono);font-size:11px;color:var(--text-faint);border:1px solid var(--border);border-radius:999px;padding:2px 8px;margin-left:8px}nav.top-nav{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:14px;color:var(--text-muted)}nav.top-nav a{color:var(--text-muted);white-space:nowrap}nav.top-nav a:hover{color:var(--accent)}.search-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}input[type=search],input[type=text],select{font:inherit;padding:9px 12px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text)}input[type=search]{flex:1;min-width:220px}input:focus,select:focus,button:focus-visible{outline:2px solid var(--focus);outline-offset:1px}.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px}.chip{font-size:13px;padding:6px 12px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer}.chip:hover{border-color:var(--accent);color:var(--accent)}.chip.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600}.section-title{font-family:var(--serif);font-size:15px;font-weight:600;text-transform:uppercase;letter-spacing:0.6px;color:var(--text-muted);margin:32px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--border)}.subject-group{margin-bottom:8px}.department-group{margin-bottom:4px;border-bottom:1px solid var(--border)}.department-group:last-of-type{border-bottom:none}.department-heading{font-family:var(--serif);font-size:18px;font-weight:600;color:var(--text);cursor:pointer;list-style:none;display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:16px 0}.department-heading::-webkit-details-marker{display:none}.department-heading::before{content:"\25b8";display:inline-block;margin-right:8px;font-size:13px;color:var(--text-muted);transition:transform 0.12s ease}details[open]>.department-heading::before{transform:rotate(90deg)}.department-heading:hover{color:var(--accent)}.department-heading:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.department-count{font-family:var(--sans, inherit);font-size:12.5px;font-weight:500;color:var(--text-muted);white-space:nowrap}.department-group .topic-grid{padding-bottom:20px}.subject-heading{font-family:var(--serif);font-size:19px;font-weight:600;margin:28px 0 12px;color:var(--text)}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}.topic-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;position:relative;transition:border-color 0.15s ease,box-shadow 0.15s ease,transform 0.15s ease}.topic-card:hover{border-color:var(--accent);box-shadow:0 3px 10px -4px rgba(0,0,0,0.18);transform:translateY(-1px)}@media(prefers-reduced-motion:reduce){.topic-card{transition:border-color 0.15s ease}.topic-card:hover{transform:none}}.topic-card a.topic-link{color:var(--text);font-weight:600;font-size:15px;display:block;margin-bottom:4px;padding-right:24px}.topic-card a.topic-link:hover{text-decoration:none;color:var(--accent)}.topic-meta{font-size:12px;color:var(--text-faint);display:flex;gap:8px;align-items:center;flex-wrap:wrap}.level-badge{font-family:var(--mono);font-size:11px;background:var(--surface-alt);border:1px solid var(--border);border-radius:4px;padding:1px 6px}.unlimited-badge{font-size:11px;color:var(--success);font-weight:600}.yours-badge{font-size:10px;font-weight:600;color:var(--focus);border:1px solid var(--focus);border-radius:999px;padding:1px 7px;text-transform:uppercase;letter-spacing:0.4px}.fav-toggle{position:absolute;top:10px;right:10px;background:none;border:none;cursor:pointer;font-size:16px;color:var(--text-faint);padding:2px;line-height:1}.fav-toggle.active{color:var(--accent)}.fav-toggle:hover{color:var(--accent)}.collection-menu{position:fixed;z-index:50;width:220px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 8px 24px rgba(0,0,0,0.18);padding:10px;font-size:13px}.collection-menu-title{font-weight:600;margin-bottom:6px;color:var(--text-muted);font-size:11px;text-transform:uppercase;letter-spacing:0.4px}.collection-menu label{display:flex;align-items:center;gap:6px;padding:4px 0;cursor:pointer}.new-collection-row{display:flex;gap:6px;margin-top:8px;padding-top:8px;border-top:1px solid var(--border)}.new-collection-row input{flex:1;min-width:0;padding:6px 8px;font-size:12px}.empty-note{color:var(--text-faint);font-size:14px;padding:24px 0}.boot-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:96px 0;color:var(--text-faint)}.boot-loading p{margin:0;font-size:14px}.boot-spinner{width:28px;height:28px;border-radius:50%;border:3px solid var(--border);border-top-color:var(--accent);animation:boot-spin 0.8s linear infinite}@keyframes boot-spin{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){.boot-spinner{animation:none;border-top-color:var(--border)}}.topic-header{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap;margin-bottom:4px}.topic-header h1{font-family:var(--serif);font-size:26px;margin:0 0 4px}.breadcrumb{font-size:13px;color:var(--text-faint);margin-bottom:12px}.breadcrumb a{color:var(--text-faint)}.breadcrumb a:hover{color:var(--accent)}.controls-bar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:16px 0 24px;padding:14px 16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}.controls-bar label{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:6px}.btn{font:inherit;font-size:13px;padding:8px 14px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;transition:border-color 0.12s ease,color 0.12s ease,background 0.12s ease,transform 0.08s ease}.btn:hover{border-color:var(--accent);color:var(--accent)}.btn:active{transform:translateY(1px)}.btn:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.btn:disabled{cursor:not-allowed;opacity:0.55;transform:none}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.btn.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--on-accent)}.seed-display{font-family:var(--mono);font-size:12px;color:var(--text-faint)}.item-list{display:flex;flex-direction:column;gap:10px}.item-row{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px}.item-num{font-family:var(--mono);font-size:12px;color:var(--text-faint);margin-right:8px}.item-text{font-size:15px;white-space:pre-wrap}.item-answer{margin-top:8px;padding-top:8px;border-top:1px dashed var(--border);font-size:14px;color:var(--success);display:none}.item-answer.shown{display:block}.item-steps{margin-top:6px;font-size:13px;color:var(--text-muted);padding-left:18px}.mcq{display:grid;gap:6px;margin:8px 0 4px}.mcq-option{display:flex;align-items:flex-start;gap:10px;width:100%;min-height:44px;padding:9px 12px;text-align:left;font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;overflow-wrap:anywhere}.mcq-option:hover:not(:disabled){border-color:var(--accent)}.mcq-option:focus-visible{outline:2px solid var(--focus);outline-offset:2px}.mcq-option:disabled{cursor:default}.mcq-key{flex:0 0 auto;min-width:1.6em;text-align:center;font-weight:600;color:var(--text-muted)}.mcq-option.mcq-selected{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.mcq-option.mcq-right{border-color:var(--success, #2e7d32);box-shadow:inset 0 0 0 1px var(--success, #2e7d32)}.mcq-option.mcq-right .mcq-key::after{content:" \2713"}.mcq-option.mcq-wrong{border-color:var(--danger, #c62828);box-shadow:inset 0 0 0 1px var(--danger, #c62828)}.mcq-option.mcq-wrong .mcq-key::after{content:" \2717"}.mcq-why{margin-top:4px;font-size:13px;color:var(--text-muted)}.item-sources{margin-top:6px;font-size:12px;color:var(--text-muted);overflow-wrap:anywhere}.item-sources a{color:var(--accent)}.privacy-list{margin:8px 0 0;padding-left:20px;font-size:13px;color:var(--text-muted)}.privacy-list li{margin-bottom:6px}.reveal-toggle{font-size:12px;color:var(--accent);cursor:pointer;margin-top:8px;display:inline-block}.hint-toggle{color:var(--focus)}.item-hint{margin-top:6px;padding:8px 10px;background:var(--surface-alt);border-left:3px solid var(--focus);border-radius:var(--radius);font-size:13px;color:var(--text-muted)}.grade-row{display:flex;gap:8px;margin-top:10px}.grade-btn.again{color:var(--danger);border-color:var(--danger)}.grade-btn.again:hover{background:var(--danger);color:var(--on-accent)}.grade-btn.good{color:var(--success);border-color:var(--success)}.grade-btn.good:hover{background:var(--success);color:var(--on-accent)}.grade-btn.unsure{color:var(--focus);border-color:var(--focus)}.grade-btn.unsure:hover{background:var(--focus);color:var(--on-accent)}.item-source{display:inline-block;font-size:10px;font-weight:600;color:var(--focus);border:1px solid var(--focus);border-radius:999px;padding:1px 7px;text-transform:uppercase;letter-spacing:0.4px;vertical-align:middle;margin-right:4px}.misconception-banner,.difficulty-nudge{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;margin:14px 0;padding:12px 14px;background:var(--surface-alt);border:1px dashed var(--focus);border-radius:var(--radius);font-size:13px}.graded-note{font-size:12px;color:var(--text-faint);font-style:italic}.install-banner{position:fixed;left:16px;right:16px;bottom:16px;z-index:60;max-width:520px;margin:0 auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 10px 30px rgba(0,0,0,0.22);padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px}.install-banner-actions{display:flex;gap:8px;flex-shrink:0}.settings-row{display:flex;flex-direction:column;gap:6px;margin-bottom:18px}.settings-row label{font-size:13px;color:var(--text-muted);display:flex;align-items:center;gap:8px}.radio-group{display:flex;gap:14px;flex-wrap:wrap}.radio-group label{font-size:14px;color:var(--text);display:flex;align-items:center;gap:6px}.speak-btn,.mic-btn{padding:2px 7px;font-size:12px;line-height:1.4;vertical-align:middle}.report-btn{color:var(--text-faint);border-color:var(--border);font-size:12px;padding:4px 10px;margin-top:8px;margin-left:6px}.report-btn:hover{color:var(--danger);border-color:var(--danger)}.pair-code-box{width:100%;max-width:480px;font-family:var(--mono);font-size:12px;padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface-alt);color:var(--text);resize:vertical}.pair-qr-img{width:200px;height:200px;image-rendering:pixelated;background:#fff;border-radius:var(--radius);padding:8px}.pair-scan-video{width:100%;max-width:320px;border-radius:var(--radius);background:#000}.kbd-hint{font-size:12px;color:var(--text-faint)}.kbd-hint kbd{font-family:var(--mono);background:var(--surface-alt);border:1px solid var(--border);border-radius:3px;padding:1px 5px;font-size:11px}.mastery-badge{margin-top:8px;font-size:11px;color:var(--text-faint);border-top:1px dashed var(--border);padding-top:6px}.flashcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:48px 24px;text-align:center;font-size:19px;cursor:pointer;min-height:140px;display:flex;align-items:center;justify-content:center;touch-action:pan-y}.touch-hint{display:none}.card-face.multiline{white-space:pre-wrap;text-align:left}.flashcard .card-face.answer{color:var(--success)}.flashcard-nav{display:flex;justify-content:space-between;align-items:center;margin-top:12px;font-size:13px;color:var(--text-muted)}.quiz-item{margin-bottom:18px}.quiz-item input[type=text]{width:100%;max-width:320px;margin-top:6px}.matrix-input-grid{display:inline-flex;flex-direction:column;gap:4px;margin-top:6px;padding:8px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface-alt)}.matrix-input-row{display:flex;gap:4px}.matrix-cell-input{width:56px;font:inherit;padding:4px 6px;border:1px solid var(--border);border-radius:4px;background:var(--surface);color:var(--text);text-align:center}.quiz-result{font-size:13px;margin-top:6px;font-weight:600}.quiz-result.correct{color:var(--success)}.quiz-result.incorrect{color:var(--danger)}.self-assess{font-size:13px;font-weight:400;color:var(--text-muted)}.self-assess .grade-btn{margin-top:6px;padding:3px 10px;font-size:12px}.hero{padding:40px 0 8px}.hero h1{font-family:var(--serif);font-size:34px;margin:0 0 10px}.hero p{color:var(--text-muted);font-size:16px;max-width:640px}.hero-stats{display:flex;flex-wrap:wrap;gap:1px;margin-top:20px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;width:fit-content}.hero-stat{background:var(--surface);padding:10px 18px;display:flex;flex-direction:column;gap:2px;min-width:92px}.hero-stat .n{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:20px;font-weight:600;color:var(--accent);line-height:1.1}.hero-stat .l{font-size:11.5px;color:var(--text-faint);letter-spacing:0.02em}footer.site-footer{border-top:1px solid var(--border);margin-top:48px;padding:24px;text-align:center;color:var(--text-faint);font-size:12px}@media print{header.site-header,.controls-bar,.fav-toggle,footer.site-footer,.search-row,.chip-row{display:none!important}.item-answer{display:block!important}body{background:#fff;color:#000}}@media(max-width:600px){.site-header .wrap{flex-direction:column;align-items:flex-start}nav.top-nav{gap:14px}}@media(max-width:480px),(pointer:coarse){.touch-hint{display:inline}.btn{min-height:44px;padding:10px 16px}.chip{min-height:40px;padding:9px 14px;display:inline-flex;align-items:center}.fav-toggle{width:40px;height:40px;display:flex;align-items:center;justify-content:center;top:2px;right:2px;font-size:18px}.speak-btn,.mic-btn{min-height:40px;padding:8px 12px}.grade-row{gap:10px}.grade-btn{flex:1;min-height:48px;font-size:14px}.flashcard-nav{flex-wrap:wrap;gap:8px}}.heatmap-scroll{overflow-x:auto;padding-bottom:6px}.heatmap{display:block;max-width:none}.hm-label{fill:var(--text-faint);font-size:10px;font-family:var(--sans)}.hm-cell{stroke:var(--border);stroke-width:0.5}.hm-l0{fill:var(--surface-alt)}.hm-l1{fill:var(--accent);fill-opacity:0.28;stroke:none}.hm-l2{fill:var(--accent);fill-opacity:0.5;stroke:none}.hm-l3{fill:var(--accent);fill-opacity:0.75;stroke:none}.hm-l4{fill:var(--accent);fill-opacity:1;stroke:none}.heatmap-legend{display:flex;align-items:center;gap:6px;font-size:0.8em;color:var(--text-faint);margin-top:4px}body.a11y-contrast .hm-l1{fill-opacity:0.45}body.a11y-contrast .hm-l2{fill-opacity:0.65}.blitz-setup{max-width:640px}.blitz-rules{color:var(--text-muted);padding-left:1.2em;line-height:1.7}.blitz-rules kbd{font-family:var(--mono);font-size:0.85em;border:1px solid var(--border);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:var(--surface-alt)}.blitz{max-width:720px;margin:0 auto}.blitz-hud{display:flex;justify-content:space-between;gap:12px;margin-bottom:10px}.blitz-stat{flex:1;text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:8px 6px}.blitz-stat strong{display:block;font-family:var(--serif);font-size:1.9rem;line-height:1.1}.blitz-label{display:block;font-size:0.72rem;text-transform:uppercase;letter-spacing:0.08em;color:var(--text-faint)}.blitz-bar{height:8px;background:var(--surface-alt);border:1px solid var(--border);border-radius:999px;overflow:hidden;margin-bottom:14px}.blitz-bar-fill{height:100%;width:100%;background:var(--accent);transition:width 0.1s linear}.blitz-bar.blitz-low .blitz-bar-fill{background:var(--danger)}.blitz-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px 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