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var(--lesson-ease-standard), border-color var(--lesson-duration-fast) var(--lesson-ease-standard), color var(--lesson-duration-fast) var(--lesson-ease-standard), transform var(--lesson-duration-fast) var(--lesson-ease-out);place-items:center;padding:0;display:inline-grid}.lesson-ai-thumb:hover:not(:disabled){border-color:var(--lesson-ink)}.lesson-ai-thumb:active:not(:disabled){transform:translateY(1px)}.lesson-ai-thumb[aria-pressed=true]{color:var(--lesson-accent-ink);background:var(--lesson-accent);border-color:var(--lesson-accent)}.lesson-ai-thumb:disabled:not([aria-pressed=true]){color:var(--lesson-muted);cursor:default;border-color:var(--lesson-line)}.lesson-ai-note{gap:10px;display:grid}.lesson-ai-note-label{font-size:var(--lesson-text-label);color:var(--lesson-ink);font-weight:600}.lesson-ai-note-field{width:100%;min-height:88px;font:inherit;color:var(--lesson-ink);resize:vertical;background:var(--lesson-elevated);border:1px solid 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0;border-top:0;padding:24px 32px 48px;position:static}}@container (width>=1024px){.lesson-shell{grid-template-rows:1fr auto;grid-template-areas:"rail main""rail bar";grid-template-columns:var(--lesson-rail) minmax(0, 1fr);align-items:start;column-gap:48px}.lesson-shell:has(>.lesson-side){grid-template-areas:"rail main side""rail bar side";grid-template-columns:var(--lesson-rail) minmax(0, 1fr) minmax(0, var(--lesson-rail))}.lesson-rail{grid-area:rail;align-self:stretch;max-height:100vh;padding:40px 0 40px 32px;display:block;position:sticky;top:0;overflow-y:auto}.lesson-side{grid-area:side;padding:40px 32px 40px 0;display:block}.lesson-main,.lesson-bar{max-width:var(--lesson-column);justify-self:center}.lesson-header,.lesson-main>:not(.lesson-header,.lesson-progress){padding-left:0;padding-right:0}.lesson-header{padding-top:40px}.lesson-progress{margin-left:0;margin-right:0}.lesson-main>:not(.lesson-header,.lesson-progress){padding-top:72px}.lesson-bar{padding:32px 0 64px}}.lesson-outline-nav{gap:16px;display:grid}.lesson-outline-nav>.lesson-eyebrow{padding:0 12px}.lesson-outline{gap:2px;margin:0;padding:0;list-style:none;display:grid}.lesson-outline-item{width:100%;min-height:var(--lesson-touch);font:inherit;font-size:var(--lesson-text-label);color:var(--lesson-ink2);text-align:left;cursor:pointer;border-radius:var(--lesson-radius-control);transition:background-color var(--lesson-duration-fast) var(--lesson-ease-standard), color var(--lesson-duration-fast) var(--lesson-ease-standard);background:0 0;border:0;grid-template-columns:24px minmax(0,1fr) 8px;align-items:center;gap:10px;padding:8px 12px;line-height:1.35;display:grid;position:relative}.lesson-outline-item:hover:not(:disabled){background:var(--lesson-tile)}.lesson-outline-num{font-family:var(--lesson-font-display);font-size:var(--lesson-text-label);font-variation-settings:"SOFT" 50;font-variant-numeric:lining-nums 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.lesson-outline-dot{background:var(--lesson-ink);border-color:var(--lesson-ink)}.lesson-section{grid-template-columns:minmax(0,1fr);gap:24px;display:grid}.lesson-section-head{grid-template-columns:minmax(0,1fr);gap:16px;display:grid}.lesson-section-title{font-family:var(--lesson-font-display);font-variation-settings:"SOFT" 50;color:var(--lesson-ink);letter-spacing:-.022em;text-wrap:balance;margin:0;font-size:clamp(2rem,1.55rem + 2.4cqi,2.875rem);font-weight:500;line-height:1.06}.lesson-say{max-width:34em;font-size:var(--lesson-text-lead);color:var(--lesson-ink2);text-wrap:pretty;margin:0;line-height:1.5}.lesson-step{border-top:1px solid var(--lesson-line);grid-template-columns:minmax(0,1fr);gap:20px;padding-top:24px;display:grid}.lesson-prose{text-wrap:pretty}.lesson-prose>:first-child{margin-top:0}.lesson-prose>:last-child{margin-bottom:0}.lesson-prose p,.lesson-prose ul,.lesson-prose ol{margin:0 0 1em}.lesson-prose ul,.lesson-prose ol{padding-left:1.25em}.lesson-prose 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no-repeat scroll, radial-gradient(farthest-side at 100% 50%, color-mix(in oklab, var(--lesson-ink) 16%, transparent), transparent) right / 12px 100% no-repeat scroll;margin:8px 0;padding:20px 0;display:block;overflow:auto hidden}.lesson-math-display .katex-display{margin:0}.lesson-math-display .katex{font-size:1.05em}@container (width>=640px){.lesson-math-display .katex{font-size:1.32em}}.lesson-expr-error{color:var(--lesson-danger);background:var(--lesson-danger-bg);border-radius:4px;padding:0 4px}.lesson-unknown-block{color:var(--lesson-muted);border:1px dashed var(--lesson-line-strong);border-radius:var(--lesson-radius-control);padding:12px 16px}.lesson-complete{grid-template-columns:minmax(0,1fr);justify-items:start;gap:20px;display:grid}.lesson-term{color:var(--lesson-tone,inherit);background:var(--lesson-tone-soft,transparent);box-shadow:0 0 0 2px var(--lesson-tone-soft,transparent);border-radius:3px}.lesson-term-text{-webkit-box-decoration-break:clone;box-decoration-break:clone;font-weight:600}.lesson-color-blue{--lesson-tone:var(--lesson-term-blue);--lesson-tone-fill:var(--lesson-term-blue-fill);--lesson-tone-soft:var(--lesson-term-blue-soft)}.lesson-color-amber{--lesson-tone:var(--lesson-term-amber);--lesson-tone-fill:var(--lesson-term-amber-fill);--lesson-tone-soft:var(--lesson-term-amber-soft)}.lesson-color-red{--lesson-tone:var(--lesson-term-red);--lesson-tone-fill:var(--lesson-term-red-fill);--lesson-tone-soft:var(--lesson-term-red-soft)}.lesson-color-green{--lesson-tone:var(--lesson-term-green);--lesson-tone-fill:var(--lesson-term-green-fill);--lesson-tone-soft:var(--lesson-term-green-soft)}.lesson-color-violet{--lesson-tone:var(--lesson-term-violet);--lesson-tone-fill:var(--lesson-term-violet-fill);--lesson-tone-soft:var(--lesson-term-violet-soft)}.lesson-color-pink{--lesson-tone:var(--lesson-term-pink);--lesson-tone-fill:var(--lesson-term-pink-fill);--lesson-tone-soft:var(--lesson-term-pink-soft)}.lesson-key{font-size:var(--lesson-text-label);color:var(--lesson-ink2);align-items:center;gap:8px;display:inline-flex}.lesson-key:before{content:"";background:var(--lesson-tone-fill,var(--lesson-line-strong));border-radius:50%;width:10px;height:10px}.lesson-card{background:var(--lesson-elevated);border:1px solid var(--lesson-line);border-radius:var(--lesson-radius-card);box-shadow:var(--lesson-shadow-base);padding:24px}.lesson-callout{background:var(--lesson-tile);border-radius:var(--lesson-radius-card);box-shadow:inset 3px 0 0 var(--lesson-tone-fill,var(--lesson-ink));gap:8px;padding:20px 24px;display:grid}.lesson-callout>.lesson-eyebrow{color:var(--lesson-tone,var(--lesson-ink2))}.lesson-quiz{background:var(--lesson-elevated);border:1px solid 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var(--lesson-duration-fast) var(--lesson-ease-out);border-radius:14px;grid-template-columns:32px minmax(0,1fr) auto;align-items:center;gap:14px;padding:10px 16px 10px 12px;display:grid}.lesson-choice:hover:not(:disabled){border-color:var(--lesson-ink2)}.lesson-choice:active:not(:disabled){transform:translateY(1px)}.lesson-choice-key{width:32px;height:32px;font-size:var(--lesson-text-label);color:var(--lesson-ink2);background:var(--lesson-tile);border:1px solid var(--lesson-line);transition:background-color var(--lesson-duration-fast) var(--lesson-ease-standard), color var(--lesson-duration-fast) var(--lesson-ease-standard);border-radius:50%;place-items:center;font-weight:600;display:grid}.lesson-choice-mark{font-size:var(--lesson-text-label);font-weight:600}.lesson-choice[data-state=selected]{background:var(--lesson-selected);border-color:var(--lesson-selected-border);box-shadow:inset 0 0 0 1px var(--lesson-selected-border)}.lesson-choice[data-state=selected] 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.lesson-choice-mark{color:var(--lesson-term-red)}.lesson-choice:disabled{cursor:default}.lesson-choice:disabled:not([data-state]){color:var(--lesson-muted)}.lesson-input{width:100%;min-height:52px;font:inherit;font-variant-numeric:tabular-nums;color:var(--lesson-ink);background:var(--lesson-elevated);border:1px solid var(--lesson-line-strong);border-radius:var(--lesson-radius-control);transition:border-color var(--lesson-duration-fast) var(--lesson-ease-standard), box-shadow var(--lesson-duration-base) var(--lesson-ease-standard);padding:12px 16px}.lesson-input::placeholder{color:var(--lesson-muted)}.lesson-input:focus-visible{border-color:var(--lesson-ink);box-shadow:0 0 0 4px color-mix(in oklab, var(--lesson-ink) 12%, transparent);outline:none}.lesson-feedback{background:var(--lesson-tile);border-radius:var(--lesson-radius-card);animation:lesson-settle var(--lesson-duration-feedback) var(--lesson-ease-out) both;grid-template-columns:28px minmax(0,1fr);gap:4px 12px;padding:14px 16px 16px 14px;display:grid}.lesson-feedback[data-tone=correct]{--lesson-tone:var(--lesson-term-green);--lesson-tone-fill:var(--lesson-term-green-fill);background:var(--lesson-term-green-soft)}.lesson-feedback[data-tone=incorrect]{--lesson-tone:var(--lesson-term-red);--lesson-tone-fill:var(--lesson-term-red-fill);box-shadow:inset 3px 0 0 var(--lesson-term-red-fill)}.lesson-feedback[data-tone=hint]{background:var(--lesson-elevated);box-shadow:inset 0 0 0 1px var(--lesson-line-strong)}.lesson-feedback[data-tone=why]{box-shadow:inset 0 0 0 1px var(--lesson-line)}.lesson-feedback-icon{width:28px;height:28px;color:var(--lesson-ink);border-radius:50%;grid-row:span 2;place-items:center;display:grid}.lesson-feedback-icon>svg{display:block}.lesson-feedback-icon:is([data-tone=correct],[data-tone=incorrect]){color:var(--lesson-surface);background:var(--lesson-tone)}.lesson-feedback-icon[data-tone=hint]{box-shadow:inset 0 0 0 1.75px var(--lesson-ink)}.lesson-feedback-title{color:var(--lesson-ink);margin:2px 0 0;font-weight:650}.lesson-feedback[data-tone=correct] .lesson-feedback-title{color:var(--lesson-tone)}.lesson-feedback-body{color:var(--lesson-ink);grid-column:2;margin:0}.lesson-feedback-actions{flex-wrap:wrap;grid-column:1/-1;gap:8px;margin-top:10px;display:flex}@container (width>=480px){.lesson-feedback{gap:4px 14px;padding:16px 20px 18px 16px}.lesson-feedback-actions{grid-column:2}.lesson-quiz{padding:24px}}@keyframes lesson-settle{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.lesson-button,.lesson-icon-button{min-width:var(--lesson-touch);min-height:var(--lesson-touch);font:inherit;cursor:pointer;border-radius:var(--lesson-radius-pill);transition:background-color var(--lesson-duration-fast) var(--lesson-ease-standard), border-color var(--lesson-duration-fast) var(--lesson-ease-standard), color var(--lesson-duration-fast) var(--lesson-ease-standard), transform var(--lesson-duration-fast) var(--lesson-ease-out);font-weight:600;line-height:1.25}.lesson-button{border:1px solid #0000;min-height:48px;padding:0 24px;font-size:1rem}.lesson-button:active:not(:disabled),.lesson-icon-button:active:not(:disabled){transform:translateY(1px)}.lesson-button-primary{min-width:132px;color:var(--lesson-accent-ink);background:var(--lesson-accent);box-shadow:var(--lesson-shadow-base)}.lesson-button-primary:hover:not(:disabled){background:var(--lesson-accent-hover)}.lesson-button-secondary{color:var(--lesson-ink);background:var(--lesson-elevated);border-color:var(--lesson-line-strong)}.lesson-button-secondary:hover:not(:disabled){border-color:var(--lesson-ink)}.lesson-button-ghost{color:var(--lesson-ink);background:0 0;padding:0 16px}.lesson-button-ghost:hover:not(:disabled){background:color-mix(in oklab, var(--lesson-ink) 6%, transparent)}.lesson-button:disabled,.lesson-icon-button:disabled{color:var(--lesson-muted);cursor:not-allowed;background:var(--lesson-disabled-bg);box-shadow:none;border-color:#0000}.lesson-icon-button{color:var(--lesson-ink);background:var(--lesson-elevated);border:1px solid var(--lesson-line);place-items:center;padding:0;display:inline-grid}.lesson-button:focus-visible,.lesson-icon-button:focus-visible,.lesson-outline-item:focus-visible,.lesson-choice:focus-visible{outline:2px solid var(--lesson-focus);outline-offset:2px}@media (prefers-reduced-motion:reduce){.lesson-root *{transition:none!important;animation:none!important}}.lesson-stage{aspect-ratio:16/9;background:var(--lesson-surface);width:100%;position:relative;overflow:hidden;container-type:size}.lesson-stage-screen{--lesson-stage-px:min(calc(100cqw / var(--lesson-stage-frame-w)), calc(100cqh / var(--lesson-stage-frame-h)));--lesson-text-body:calc(var(--lesson-stage-body) * var(--lesson-stage-px));--lesson-text-caption:calc(var(--lesson-stage-caption) * var(--lesson-stage-px));--lesson-text-eyebrow:calc(var(--lesson-stage-eyebrow) * var(--lesson-stage-px));--lesson-text-label:calc(var(--lesson-stage-label) * var(--lesson-stage-px));--lesson-text-lead:calc(var(--lesson-stage-lead) * var(--lesson-stage-px));gap:calc(48 * var(--lesson-stage-px));padding:calc(112 * var(--lesson-stage-px)) calc(144 * var(--lesson-stage-px)) calc(64 * var(--lesson-stage-px));font-size:var(--lesson-text-body);grid-template-rows:minmax(0,1fr) auto;line-height:1.45;display:grid;position:absolute;inset:0}.lesson-stage-screen .lesson-section{gap:calc(40 * var(--lesson-stage-px));max-width:calc(1360 * var(--lesson-stage-px));align-content:start}.lesson-stage-screen .lesson-section-head{gap:calc(24 * var(--lesson-stage-px))}.lesson-stage-screen .lesson-section-title{max-width:18em;font-size:calc(var(--lesson-stage-title) * var(--lesson-stage-px));line-height:1.04}.lesson-stage-screen .lesson-say{max-width:30em;line-height:1.4}.lesson-stage-screen .lesson-math-display .katex{font-size:calc(var(--lesson-stage-math) * 1em)}.lesson-stage-screen .lesson-term{box-shadow:0 0 0 calc(4 * var(--lesson-stage-px)) var(--lesson-tone-soft,transparent)}.lesson-stage-screen .lesson-eyebrow{gap:calc(16 * var(--lesson-stage-px))}.lesson-stage-screen .lesson-eyebrow-rule{width:calc(40 * var(--lesson-stage-px));height:calc(2 * var(--lesson-stage-px))}.lesson-stage-foot{gap:calc(16 * var(--lesson-stage-px)) calc(32 * var(--lesson-stage-px));font-size:var(--lesson-text-label);color:var(--lesson-muted);grid-template-columns:minmax(0,1fr) auto;align-items:baseline;font-weight:600;display:grid}.lesson-stage-foot>.lesson-progress{height:calc(4 * var(--lesson-stage-px));grid-column:1/-1;margin:0}.lesson-print .lesson-rail,.lesson-print .lesson-side,.lesson-print .lesson-bar,.lesson-print .lesson-progress{display:none}.lesson-print .lesson-shell{display:block}.lesson-print .lesson-main{max-width:var(--lesson-column);padding:0}@media print{.lesson-rail,.lesson-side,.lesson-bar,.lesson-progress{display:none!important}.lesson-shell{display:block}.lesson-section{break-inside:avoid-page}.lesson-term{box-shadow:none}}