@font-face{font-family:Lemma Math;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2)format("woff2");font-display:swap}@font-face{font-family:Lemma Math Italic;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2)format("woff2");font-style:italic;font-display:swap}@font-face{font-family:Lemma Display;src:url(/fonts/fraunces-latin-sub.woff2)format("woff2");font-weight:100 900;font-display:swap;unicode-range:U+20-7E,U+A0,U+B0,U+B7,U+D7,U+F7,U+2013,U+2014,U+2018,U+2019,U+201C,U+201D,U+2022,U+2026,U+2190,U+2192,U+2212}@font-face{font-family:Lemma Display;src:url(/fonts/fraunces-latin.woff2)format("woff2");font-weight:100 900;font-display:swap;unicode-range:U+0-1F,U+7F-9F,U+A1-AF,U+B1-B6,U+B8-D6,U+D8-F6,U+F8-2012,U+2015-2017,U+201A-201B,U+201E-2021,U+2023-2025,U+2027-218F,U+2191,U+2193-2211,U+2213-FFFF}@font-face{font-family:Lemma 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14px;display:flex}.scratch-head:active{cursor:grabbing}.scratch-head button{cursor:pointer}.scratch-resize-handle{z-index:4;color:#9aa7b6;cursor:nwse-resize;touch-action:none;background:0 0;border:0;border-radius:0 0 14px;place-items:center;width:22px;height:22px;padding:0;display:grid;position:absolute;bottom:0;right:0}.scratch-resize-handle svg{transform:rotate(45deg)}.scratch-resize-handle:hover{color:var(--blue)}.scratch-mode{border:1px solid var(--line);background:#f5f3ee;border-radius:8px;align-items:center;gap:3px;padding:3px;display:flex}.scratch-mode button{min-height:27px;color:var(--muted);font:650 .65rem var(--font-sans);cursor:pointer;background:0 0;border:0;border-radius:6px;align-items:center;gap:4px;padding:0 7px;display:flex}.scratch-mode button.is-active{color:var(--blue);background:#fff;box-shadow:0 1px 4px #141f301a}.scratch-paper{background-image:linear-gradient(#276ad11a 1px,#0000 1px);background-size:100% 28px;min-height:200px;position:relative}.scratch-paper 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#2563eb47;border-radius:9px;align-items:center;gap:7px;padding:0 12px;transition:background .15s,border-color .15s,transform .15s;display:inline-flex}.refresher-button.is-used{border-color:var(--line);color:var(--muted);background:#fff}.guided-plan{background:#e8f1ffad;border:1px solid #2563eb2e;border-radius:12px;gap:8px;margin:0 0 22px;padding:16px 18px;display:grid}.guided-plan .eyebrow{color:var(--blue);align-items:center;gap:6px;display:flex}.guided-plan strong{color:var(--ink);font:650 1rem/1.45 var(--font-serif)}.guided-plan small{color:var(--muted);font-size:.72rem;line-height:1.45}.concept-drawer{z-index:120;overscroll-behavior:contain;width:100vw;height:100dvh;min-height:0;box-shadow:none;isolation:isolate;background:radial-gradient(circle at 50% 25%,#2563eb0e,#0000 36%),#faf9f6;border:0;border-radius:0;grid-template-rows:auto minmax(0,1fr) auto;animation:.22s ease-out concept-in;display:grid;position:fixed;inset:0;overflow:hidden}@keyframes concept-in{0%{opacity:0}to{opacity:1}}.concept-head{min-height:88px;padding:max(20px, env(safe-area-inset-top)) max(32px, env(safe-area-inset-right)) 18px max(32px, env(safe-area-inset-left));-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#faf9f6e6;border-bottom:1px solid #121f311a;justify-content:space-between;align-items:center;gap:18px;display:flex}.concept-head strong{color:var(--ink);font:750 1.12rem/1.25 var(--font-sans);margin-top:5px;display:block}.concept-head .icon-button{background:#121f310b;border-radius:50%;flex:none;width:44px;height:44px}.concept-body{grid-template-rows:auto minmax(0,1fr);min-height:0;padding:0;display:grid;overflow:hidden}.lesson-progress{background:var(--stone);height:4px;overflow:hidden}.lesson-progress i{background:var(--cobalt);border-radius:999px;height:100%;transition:width .22s;display:block}.lesson-page{scrollbar-gutter:stable;align-content:start;width:min(760px,100% - 48px);min-height:0;margin:0 auto;padding:clamp(38px,7vh,82px) 0 48px;animation:.18s ease-out lesson-page-in;overflow-y:auto}@keyframes lesson-page-in{0%{opacity:0;transform:translate(6px)}to{opacity:1;transform:none}}.lesson-page>.eyebrow{color:var(--cobalt)}.lesson-page h2{max-width:720px;color:var(--ink);font:600 clamp(1.8rem, 3vw, 2.65rem)/1.25 var(--font-serif);letter-spacing:-.022em;margin:18px 0 0}.lesson-step-number{background:var(--cobalt);color:#fff;width:42px;height:42px;font:800 1rem var(--font-sans);border-radius:14px;place-items:center;margin-top:22px;display:grid;box-shadow:0 8px 20px #2563eb33}.lesson-term{background:var(--violet-soft);width:fit-content;color:var(--violet);font:750 .92rem var(--font-sans);border-radius:10px;margin-top:28px;padding:10px 14px;display:inline-flex}.lesson-glossary{border:1px solid var(--line);background:#ffffffb8;border-radius:13px;margin-top:18px}.lesson-glossary summary{color:var(--ink);font:750 .82rem var(--font-sans);cursor:pointer;justify-content:space-between;align-items:center;gap:14px;padding:14px 16px;display:flex}.lesson-glossary summary span{background:var(--violet-soft);min-width:24px;height:24px;color:var(--violet);border-radius:999px;place-items:center;font-size:.68rem;display:grid}.lesson-glossary dl{gap:0;margin:0;padding:0 16px 14px;display:grid}.lesson-glossary dl>div{border-top:1px solid var(--line);grid-template-columns:minmax(110px,.35fr) minmax(0,1fr);gap:14px;padding:11px 0;display:grid}.lesson-glossary dt{color:var(--violet);font:750 .78rem/1.45 var(--font-sans)}.lesson-glossary dd{color:var(--ink-soft);font:500 .8rem/1.5 var(--font-sans);margin:0}.lesson-method-pair{gap:12px;margin:24px 0 0;padding:0;list-style:none;display:grid}.lesson-method-pair li{border:1px solid var(--line);background:var(--white);border-radius:13px;grid-template-columns:42px minmax(0,1fr);align-items:center;gap:14px;padding:16px 18px;display:grid}.lesson-method-pair li>span{background:var(--cobalt);color:#fff;width:38px;height:38px;font:800 .9rem var(--font-sans);border-radius:12px;place-items:center;display:grid}.lesson-method-pair p{color:var(--ink);font:600 1rem/1.5 var(--font-serif);margin:0}.lesson-transition-board{grid-template-columns:minmax(0,1fr) minmax(130px,.58fr) minmax(0,1fr);align-items:stretch;gap:14px;margin-top:24px;display:grid}.lesson-transition-state{border:1px solid var(--line);background:var(--white);border-radius:14px;align-content:center;gap:12px;min-width:0;min-height:158px;padding:18px;display:grid}.lesson-transition-state.is-after{background:var(--cobalt-soft);border-color:#2563eb4d}.lesson-transition-state>span{color:var(--muted);font:800 .65rem var(--font-sans);letter-spacing:.09em;text-transform:uppercase}.lesson-transition-state strong{color:var(--ink);font:600 .96rem/1.55 var(--font-serif)}.lesson-transition-state .lemma-math-field{width:100%;font-size:20px}.lesson-transition-why{color:var(--cobalt);text-align:center;align-content:center;place-items:center;gap:8px;padding:12px 6px;display:grid}.lesson-transition-why p{color:var(--ink-soft);font:500 .75rem/1.5 var(--font-sans);margin:0}.lesson-transition-why b{color:var(--cobalt);letter-spacing:.04em;text-transform:uppercase;margin-bottom:4px;font-size:.66rem;display:block}.lesson-concept-visual{background:linear-gradient(150deg,#e8f1ffb8,#ffffffe0);border:1px solid #2563eb33;border-radius:14px;margin:20px 0 0;padding:16px 18px 14px}.lesson-visual-heading{gap:4px;display:grid}.lesson-visual-heading span{color:var(--cobalt);font:800 .62rem var(--font-sans);letter-spacing:.08em;text-transform:uppercase}.lesson-visual-heading strong{color:var(--ink);font:650 1rem/1.35 var(--font-serif)}.lesson-concept-visual svg{width:100%;max-height:270px;margin-top:8px;display:block;overflow:visible}.lesson-concept-visual figcaption{color:var(--ink-soft);font:500 .76rem/1.5 var(--font-sans);margin-top:4px}.lesson-concept-visual text{fill:var(--muted);font:650 13px var(--font-sans);text-anchor:middle;paint-order:stroke;stroke:#fffffff0;stroke-width:4px;stroke-linejoin:round}.lesson-concept-visual .lesson-visual-label{fill:var(--ink);font-weight:750}.lesson-concept-visual .lesson-visual-angle{fill:var(--violet);font:800 16px var(--font-serif)}.lesson-visual-axis{fill:var(--ink-soft);stroke:var(--ink-soft);stroke-width:2px}.lesson-visual-tick{stroke:var(--muted);stroke-width:1.5px}.lesson-visual-frame{fill:#ffffff73;stroke:#121f3129}.lesson-visual-grid{stroke:#121f3114;stroke-width:1px}.lesson-visual-emphasis{fill:none;stroke:var(--cobalt);stroke-width:5px;stroke-linecap:round;stroke-linejoin:round}.lesson-visual-guide{fill:none;stroke:var(--violet);stroke-width:2.5px;stroke-dasharray:7 6;stroke-linecap:round;stroke-linejoin:round}.lesson-visual-fill{fill:var(--cobalt)}.lesson-visual-point{fill:var(--cobalt);stroke:#fff;stroke-width:3px}.lesson-visual-point.is-open{fill:#fff;stroke:var(--cobalt);stroke-width:4px}.lesson-visual-circle{fill:#fff6;stroke:var(--ink-soft);stroke-width:2.5px}.lesson-visual-angle-arc{fill:none;stroke:var(--violet);stroke-width:3px;stroke-linecap:round}.lesson-expression-stages{grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;gap:10px;margin-top:16px;display:grid}.lesson-expression-stage{grid-template-rows:auto 1fr;grid-template-columns:minmax(0,1fr) auto;gap:8px;min-width:0;display:grid}.lesson-expression-stage>span{color:var(--muted);font:800 .62rem var(--font-sans);letter-spacing:.06em;text-transform:uppercase;grid-column:1}.lesson-expression-stage>div{grid-column:1;align-content:start;gap:8px;display:grid}.lesson-expression-stage>svg{color:var(--cobalt);grid-area:1/2/span 2;align-self:center}.lesson-expression-group{background:#e8f1ffb8;border:1px solid #2563eb33;border-radius:11px;gap:7px;padding:11px;display:grid}.lesson-expression-group.tone-violet{background:#f2ecfcb8;border-color:#7b56c438}.lesson-expression-group.tone-coral{background:#ffede8b8;border-color:#ef654538}.lesson-expression-group small{color:var(--muted);font:750 .62rem var(--font-sans);text-transform:uppercase}.lesson-expression-group p{flex-wrap:wrap;gap:7px;margin:0;display:flex}.lesson-expression-group b{color:var(--ink);font:700 .88rem var(--font-serif);background:#ffffffd1;border-radius:7px;padding:5px 8px}.lesson-example-prompt{background:var(--cobalt-soft);border:1px solid #2563eb33;border-radius:13px;gap:7px;margin-top:22px;padding:18px;display:grid}.lesson-example-prompt span{color:var(--cobalt);font:750 .65rem/1 var(--font-sans);letter-spacing:.09em;text-transform:uppercase}.lesson-example-prompt strong{color:var(--ink);font:600 1.03rem/1.45 var(--font-serif)}.lesson-example-prompt.compact{margin-top:13px;padding:12px 14px}.lesson-example-lines{gap:9px;margin:18px 0 0;padding:0;list-style:none;display:grid}.lesson-example-lines li{border:1px solid var(--line);background:var(--paper);opacity:.65;border-radius:11px;grid-template-columns:28px minmax(0,1fr);gap:10px;padding:11px 12px;display:grid}.lesson-example-lines li.is-current{background:var(--cobalt-soft);opacity:1;border-color:#2563eb59}.lesson-line-number{background:var(--white);width:24px;height:24px;color:var(--muted);font:750 .68rem var(--font-sans);border-radius:50%;place-items:center;display:grid}.lesson-example-lines .lemma-math-field{font-size:18px}.lesson-example-lines p{color:var(--ink-soft);font:500 .76rem/1.48 var(--font-sans);margin:6px 0 0}.lesson-check-choices{gap:10px;max-width:680px;margin-top:28px;display:grid}.lesson-check-choices button{border:1px solid var(--line);background:var(--white);color:var(--ink-soft);font:600 .9rem/1.45 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12px;font-size:1.25rem}.lesson-check-entry .primary-button{justify-content:center;min-width:112px}.lesson-not-sure{color:var(--muted);font:650 .72rem var(--font-sans);cursor:pointer;background:0 0;border:0;margin-top:12px;padding:0}.lesson-check-feedback{background:var(--coral-soft);color:#7d3421;font:600 .75rem/1.45 var(--font-sans);border-radius:10px;margin:15px 0 0;padding:11px 12px}.lesson-check-feedback.is-correct{background:var(--lime-soft);color:#315c1d}.lesson-ask{color:var(--cobalt);font:700 .84rem var(--font-sans);cursor:pointer;background:0 0;border:0;align-items:center;gap:7px;margin-top:28px;padding:0;display:inline-flex}.lesson-ask:hover{text-underline-offset:3px;text-decoration:underline}.lesson-footer{min-height:78px;padding:14px max(24px, calc((100vw - 760px) / 2)) max(14px, env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffe6;border-top:1px solid #121f311a;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;display:grid}.lesson-footer>span{color:var(--muted);font:650 .78rem var(--font-sans);text-align:center}.lesson-footer button{justify-content:center;align-items:center;gap:7px;min-width:126px;min-height:46px;display:inline-flex}.concept-formula{background:var(--cobalt-soft);border:1px solid #2563eb2e;border-radius:11px;gap:8px;margin:16px 0 0;padding:13px 15px;display:grid}.concept-formula>span{color:var(--cobalt);font:800 .62rem var(--font-sans);letter-spacing:.08em;text-transform:uppercase}.concept-formula .lemma-math-field{font-size:17px}.recognition-check{border:1px solid var(--line);border-left:3px solid var(--violet);background:var(--white);border-radius:12px;margin:16px 0 0;padding:14px 16px}.recognition-check.is-right{border-left-color:var(--lime)}.recognition-check.is-wrong{border-left-color:var(--coral)}.recognition-check .eyebrow{color:var(--violet);align-items:center;gap:6px;margin:0;display:flex}.recognition-prompt{color:var(--ink);font:600 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