.print-attribution[data-astro-cid-ljo7ttbn]{display:none}@media print{.print-attribution[data-astro-cid-ljo7ttbn]{bottom:0;color:#414141;font:9pt/1.3 var(--font-body);letter-spacing:normal;z-index:100;background:0 0;justify-content:space-between;align-items:baseline;gap:4mm;padding-top:2mm;display:flex;position:fixed;inset-inline:0}html[data-print-margins] .print-attribution[data-astro-cid-ljo7ttbn]{display:none}.print-attribution[data-astro-cid-ljo7ttbn] strong[data-astro-cid-ljo7ttbn]{flex:none;font-weight:650}.print-attribution[data-astro-cid-ljo7ttbn] span[data-astro-cid-ljo7ttbn]{overflow-wrap:anywhere;text-align:end}body[data-print-content] .lesson-readable{display:block!important}body[data-print-content] #lesson-player{display:none!important}body[data-print-content] [data-lesson-pending]{visibility:visible!important}body[data-print-content] .site-header,body[data-print-content] .skip-link{display:none!important}}.legal-notice[data-astro-cid-rgrphdhq]{color:var(--muted);margin:12px 0 0;font-size:.875rem;line-height:1.6}.legal-notice[data-astro-cid-rgrphdhq] a{color:inherit;text-underline-offset:var(--underline-offset);margin:-14px -5px;padding:14px 5px;text-decoration:underline}@font-face{font-family:Google Sans;font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/google-sans-latin.woff2)format("woff2")}#signin-dialog{box-sizing:border-box;background:var(--card,#fff);width:min(432px,100vw - 32px);max-width:none;max-height:calc(100dvh - 32px);color:var(--ink,#263b32);overscroll-behavior:contain;scrollbar-color:var(--control-border) var(--card);font:400 1rem/1.6 var(--font-body);border:0;border-radius:16px;margin:auto;padding:40px 32px 32px;overflow:auto;box-shadow:0 24px 64px #102d1f38}#signin-dialog::backdrop{background:#15251d8a}#signin-dialog *{box-sizing:border-box}#signin-dialog [hidden]{display:none!important}#signin-dialog [data-social-signin][data-social-checking]{visibility:hidden}#signin-dialog ::selection{background:var(--accent-soft);color:var(--ink)}#signin-dialog :focus-visible{outline:3px solid var(--accent);outline-offset:3px}#signin-dialog h2{font:650 1.75rem/1.2 var(--font-body);letter-spacing:-.025em;text-wrap:balance;margin:12px 20px 12px 0}#signin-dialog h2:focus{outline:none}#signin-dialog p{margin:0;font-size:1em;line-height:1.6}#signin-dialog .signin-intro{color:var(--muted);overflow-wrap:anywhere;margin-bottom:28px}#signin-dialog .signin-actions{gap:12px;display:grid}#signin-dialog .signin-news{min-height:44px;color:var(--ink);cursor:pointer;overflow-wrap:anywhere;grid-template-columns:20px minmax(0,1fr);align-items:start;gap:12px;margin:0 0 4px;padding:2px 0;font-size:.9375rem;font-weight:400;line-height:1.5;display:grid}#signin-dialog .signin-news input{appearance:auto;width:20px;min-width:0;height:20px;min-height:0;accent-color:var(--accent);cursor:pointer;margin:1px 0 0;padding:0}#signin-dialog button{cursor:pointer}#signin-dialog .signin-choice{border:1px solid var(--control-border,#748477);background:var(--card,#fff);width:100%;min-height:52px;color:var(--ink);font:600 1rem/1.4 var(--font-body);text-align:center;overflow-wrap:anywhere;border-radius:12px;grid-template-columns:24px 1fr 24px;align-items:center;gap:8px;margin:0;padding:12px 16px;display:grid}#signin-dialog .signin-choice img,#signin-dialog .signin-choice svg{justify-self:center}#signin-dialog .signin-choice[data-social-provider=google]{font-family:"Google Sans",var(--font-body);font-weight:500}#signin-dialog .signin-choice:hover{background:var(--bg)}#signin-dialog .signin-choice:active{background:var(--accent-soft)}#signin-dialog .signin-choice[aria-disabled=true]{opacity:.65;cursor:wait}#signin-dialog .signin-close{width:44px;height:44px;color:var(--muted);background:0 0;border:0;border-radius:12px;place-items:center;padding:0;display:grid;position:absolute;top:8px;right:8px}#signin-dialog .signin-close:hover{background:var(--accent-soft);color:var(--ink)}#signin-dialog .signin-back{min-height:44px;color:var(--accent);font:600 .875rem/1.4 var(--font-body);background:0 0;border:0;border-radius:9px;align-items:center;gap:6px;margin:-12px 36px 16px -8px;padding:8px;display:flex}#signin-dialog .signin-back:hover{background:var(--accent-soft)}#signin-dialog .legal-notice{color:var(--muted);margin-top:24px;font-size:.8125rem;line-height:1.65}#signin-dialog .legal-notice a{color:inherit;text-underline-offset:3px;text-decoration:underline}#signin-dialog form{margin:0}#signin-dialog label{margin-bottom:8px;font-size:.875rem;font-weight:600;display:block}#signin-dialog input{border:1px solid var(--control-border);background:var(--card);width:100%;min-width:0;min-height:52px;color:var(--ink);caret-color:var(--accent);font:400 1rem/1.5 var(--font-body);border-radius:12px;padding:12px 14px}#signin-dialog input::placeholder{color:var(--muted)}#signin-dialog input[aria-invalid=true]{border-color:var(--bad)}#signin-dialog .signin-primary{background:var(--accent);width:100%;min-height:52px;color:var(--accent-ink,#fff);font:650 1rem/1.5 var(--font-body);border:0;border-radius:12px;margin-top:16px;padding:12px 16px}#signin-dialog .signin-primary:hover{background:var(--accent-hover,#104d3a)}#signin-dialog .signin-primary:disabled{background:var(--control-disabled-bg);color:var(--control-disabled-ink);cursor:wait}#signin-dialog .signin-hint{color:var(--muted);margin-top:12px;font-size:.875rem}#signin-dialog .signin-error{color:var(--bad,#a8412a);margin-top:8px;font-size:.875rem}#signin-dialog #signin-dialog-code{letter-spacing:.24em;font-variant-numeric:tabular-nums;font-size:1.5rem}#signin-dialog[data-inline]{width:100%;max-width:432px;max-height:none;box-shadow:none;background:0 0;border-radius:0;margin:0;padding:0;position:relative;inset:auto;overflow:visible}#signin-dialog[data-inline] .signin-close{display:none}#signin-dialog[data-inline] h2{margin-top:0}@media (width<=480px){#signin-dialog:not([data-inline]){width:calc(100vw - 24px);max-height:calc(100dvh - 24px);padding:32px 24px 24px}#signin-dialog h2{font-size:1.625rem}}@media (height<=520px){#signin-dialog:not([data-inline]){max-height:calc(100dvh - 24px);margin:12px auto}}@media (forced-colors:active){#signin-dialog{border:1px solid canvastext}#signin-dialog .signin-primary{border:1px solid buttontext}}.ads-consent-banner[data-astro-cid-ywc2ftns]{inset-inline:var(--page-gutter);z-index:40;max-width:calc(var(--browse-width) - 2 * var(--page-gutter));background:var(--accent-soft);color:var(--ink);border:1px solid var(--control-border);border-radius:16px;grid-template-columns:minmax(0,1fr) 320px;align-items:center;gap:20px;max-height:calc(100dvh - 40px);margin-inline:auto;padding:16px;display:grid;position:fixed;bottom:20px;overflow:auto}@supports (backdrop-filter:blur(16px)){.ads-consent-banner[data-astro-cid-ywc2ftns]:not([data-in-signin]){background:color-mix(in srgb, var(--accent-soft) 88%, transparent);backdrop-filter:blur(16px)saturate(1.2)}}@media (prefers-reduced-transparency:reduce),(forced-colors:active){.ads-consent-banner[data-astro-cid-ywc2ftns]:not([data-in-signin]){background:var(--accent-soft);backdrop-filter:none}}.ads-consent-banner[data-astro-cid-ywc2ftns] h2[data-astro-cid-ywc2ftns]{letter-spacing:-.02em;margin:0 0 4px;font-size:1.0625rem;font-weight:650;line-height:1.35}.ads-consent-banner[data-astro-cid-ywc2ftns] p[data-astro-cid-ywc2ftns]{max-width:90ch;margin:0;font-size:.875rem;line-height:20px}.ads-consent-banner[data-astro-cid-ywc2ftns] p[data-astro-cid-ywc2ftns]:first-of-type{display:inline}.ads-consent-banner[data-astro-cid-ywc2ftns] .ads-consent-note[data-astro-cid-ywc2ftns]{color:var(--muted);margin-inline-start:.35em;font-size:.8125rem;line-height:1.4;display:inline}.ads-consent-actions[data-astro-cid-ywc2ftns]{grid-template-columns:1fr 1fr;gap:10px;display:grid}.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns]{border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);min-height:44px;font:inherit;cursor:pointer;border-radius:10px;padding:10px 8px;font-size:.875rem;font-weight:650;line-height:1.4}.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns]:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.ads-consent-actions[data-astro-cid-ywc2ftns] [data-astro-cid-ywc2ftns][data-ads-consent-deny]{background:var(--card);color:var(--accent);border-color:var(--control-border)}.ads-consent-actions[data-astro-cid-ywc2ftns] [data-astro-cid-ywc2ftns][data-ads-consent-deny]:hover{background:var(--surface);border-color:var(--accent)}.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns]:disabled,.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]:disabled{cursor:wait}.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns]:focus-visible,.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.ads-setting[data-astro-cid-ywc2ftns]{border-top:1px solid var(--line);grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:16px 32px;padding-block:28px;scroll-margin-top:24px;display:grid}.ads-setting[data-astro-cid-ywc2ftns] h2[data-astro-cid-ywc2ftns]{font-size:var(--text-section,1.5rem);margin:0 0 12px;line-height:1.3}.ads-setting[data-astro-cid-ywc2ftns] p[data-astro-cid-ywc2ftns]{max-width:64ch;color:var(--muted);margin:8px 0 0;font-size:.9375rem}.ads-setting[data-astro-cid-ywc2ftns] .ads-setting-privacy[data-astro-cid-ywc2ftns]{font-size:.875rem}.ads-switch[data-astro-cid-ywc2ftns]{cursor:pointer;min-height:44px;color:var(--muted);align-items:center;gap:14px;padding:0 2px;display:flex;position:relative}.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]{appearance:none;cursor:pointer;border-radius:6px;width:100%;height:100%;margin:0;position:absolute;inset:0}.ads-switch-track[data-astro-cid-ywc2ftns]{border:1px solid var(--control-border);background:var(--card);pointer-events:none;border-radius:20px;flex:none;width:46px;height:26px;position:relative}.ads-switch-track[data-astro-cid-ywc2ftns]:after{content:"";background:var(--muted);border-radius:50%;width:18px;height:18px;position:absolute;top:3px;left:3px}.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]:checked+.ads-switch-track[data-astro-cid-ywc2ftns]{background:var(--accent);border-color:var(--accent)}.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]:checked+.ads-switch-track[data-astro-cid-ywc2ftns]:after{background:var(--accent-ink);left:23px}.ads-consent-error[data-astro-cid-ywc2ftns]{grid-column:1/-1;color:var(--error)!important}body:has([data-ads-consent-banner]:not([hidden],[data-in-signin])){padding-bottom:var(--ads-consent-height,250px)}@media (width<=1000px){.ads-consent-banner[data-astro-cid-ywc2ftns]{grid-template-columns:1fr;gap:14px;padding:16px}.ads-consent-actions[data-astro-cid-ywc2ftns]{max-width:340px}}@media (width<=650px){.ads-consent-banner[data-astro-cid-ywc2ftns]{inset-inline:8px;border-radius:14px;gap:8px;max-height:calc(100dvh - 16px);padding:10px 12px;bottom:8px}.ads-consent-banner[data-astro-cid-ywc2ftns] h2[data-astro-cid-ywc2ftns]{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.ads-consent-banner[data-astro-cid-ywc2ftns] [data-astro-cid-ywc2ftns]:is(.ads-consent-more,.ads-consent-note){display:none}.ads-consent-banner[data-astro-cid-ywc2ftns] p[data-astro-cid-ywc2ftns]{font-size:.8125rem;line-height:1.4}.ads-consent-actions[data-astro-cid-ywc2ftns]{gap:10px;width:100%;max-width:none}.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns]{background:var(--card);min-height:44px;color:var(--accent);border-color:var(--control-border);padding:10px 8px;font-size:.875rem}.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns]:hover{background:var(--surface);border-color:var(--accent)}.ads-setting[data-astro-cid-ywc2ftns]{grid-template-columns:1fr;padding-block:24px}.ads-switch[data-astro-cid-ywc2ftns]{justify-self:start}}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin]{inset:auto;z-index:auto;grid-template-columns:minmax(0,1fr);gap:10px;width:100%;min-width:0;max-width:none;max-height:none;margin:0 0 20px;padding:12px;position:static;inset-inline:auto;overflow:visible}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] h2[data-astro-cid-ywc2ftns]{font:650 1.0625rem/1.35 var(--font-body);margin:0 0 4px}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] p[data-astro-cid-ywc2ftns]{margin:0;font-size:.875rem;line-height:20px}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] .ads-consent-note[data-astro-cid-ywc2ftns]{margin-inline-start:.35em;font-size:.8125rem;line-height:1.4}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] .ads-consent-actions[data-astro-cid-ywc2ftns]{grid-template-columns:repeat(2,minmax(0,1fr));width:100%;max-width:none}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] button[data-astro-cid-ywc2ftns]{white-space:normal;overflow-wrap:anywhere;min-width:0;min-height:44px;font-size:.875rem}@media (width<=650px){#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] h2[data-astro-cid-ywc2ftns]{margin:-1px}#signin-dialog .ads-consent-banner[data-astro-cid-ywc2ftns][data-in-signin] p[data-astro-cid-ywc2ftns]{font-size:.8125rem;line-height:1.4}}@media print{.ads-consent-banner[data-astro-cid-ywc2ftns],.ads-setting[data-astro-cid-ywc2ftns]{display:none!important}}@media (forced-colors:active){.ads-consent-banner[data-astro-cid-ywc2ftns],.ads-consent-actions[data-astro-cid-ywc2ftns] button[data-astro-cid-ywc2ftns],.ads-switch-track[data-astro-cid-ywc2ftns]{border-color:buttontext}.ads-switch-track[data-astro-cid-ywc2ftns]:after{background:buttontext}.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]:checked+.ads-switch-track[data-astro-cid-ywc2ftns]{background:highlight}.ads-switch[data-astro-cid-ywc2ftns] input[data-astro-cid-ywc2ftns]:checked+.ads-switch-track[data-astro-cid-ywc2ftns]:after{background:highlighttext}}:where([data-color-subject=Spatial]){--subject-surface:var(--mint);--subject-preview-surface:#ccded3;--subject-ink:#174f3c;--subject-cover:#345442;--subject-cover-ink:#fffef9;--subject-spine:#263b32}:where([data-color-subject=Memory]){--subject-surface:var(--lavender);--subject-preview-surface:#dfd7e9;--subject-ink:#423c58;--subject-cover:#c9bddb;--subject-cover-ink:#423c58;--subject-spine:#766983}:where([data-color-subject=Math]){--subject-surface:var(--apricot);--subject-preview-surface:#f2d7c1;--subject-ink:#633e2d;--subject-cover:#e9bd98;--subject-cover-ink:#263b32;--subject-spine:#96704e}:where([data-color-subject=Geometry]){--subject-surface:var(--blue);--subject-preview-surface:#d5e2e8;--subject-ink:#284e60;--subject-cover:#456b7b;--subject-cover-ink:#fffef9;--subject-spine:#284e60}:where([data-color-subject=Language]){--subject-surface:var(--mint);--subject-preview-surface:#dce5d5;--subject-ink:#174f3c;--subject-cover:#dce5d5;--subject-cover-ink:#263b32;--subject-spine:#788b71}:where([data-color-subject=Reasoning]){--subject-surface:var(--mint);--subject-preview-surface:#dde0dc;--subject-ink:#174f3c;--subject-cover:#53634f;--subject-cover-ink:#fffef9;--subject-spine:#263b32}:where([data-color-subject=Attention]){--subject-surface:var(--apricot);--subject-preview-surface:#e5d8d0;--subject-ink:#633e2d;--subject-cover:#dac7bc;--subject-cover-ink:#263b32;--subject-spine:#9c8071}:where([data-color-subject=Music]){--subject-surface:var(--lavender);--subject-preview-surface:#e4e0e7;--subject-ink:#423c58;--subject-cover:#786488;--subject-cover-ink:#fffef9;--subject-spine:#50405e}:where([data-color-subject=Probability]){--subject-surface:var(--apricot);--subject-preview-surface:#f2d7c1;--subject-ink:#633e2d;--subject-cover:#e9bd98;--subject-cover-ink:#263b32;--subject-spine:#96704e}:where([data-color-subject=Statistics]){--subject-surface:var(--lavender);--subject-preview-surface:#dfd7e9;--subject-ink:#423c58;--subject-cover:#c9bddb;--subject-cover-ink:#423c58;--subject-spine:#766983}:root[data-theme=dark]{--bg:#101914;--paper:#101914;--ink:#e7ebdf;--muted:#a9b6a7;--line:#2c3a32;--card:#18241e;--accent:#8fd1b0;--accent-ink:#0b1811;--accent-hover:#a7ddc2;--accent-active:#c0e8d3;--accent-soft:#213a2d;--mint:#1b2b22;--apricot:#4b372b;--lavender:#232130;--control-border:#6c8376;--good:#8fd1b0;--bad:#f2a58f;--soft:#213a2d;--surface:#141f19;--surface-raised:#18241e;--white:#0b1811;--error:#f2a58f;--error-surface:#2c221c;--control-disabled-bg:#26332c;--control-disabled-ink:#a9b6a7;--control-chevron:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8' fill='none' stroke='%23A9B6A7' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m1 1 5 5 5-5'/%3E%3C/svg%3E");--search-red:#ff8a7a;--search-green:#63d69a;--search-blue:#82b4ff;--search-yellow:#efc65a;--brand-mark:#8fd1b0;--probability-axis-ink:var(--ink);--ink-spatial:#b7dcc6;--ink-memory:#cfc4e6;--ink-math:#f0c9a8;--tile-memory:#2a2637;--tile-memory-line:#8d82a3;--right-bg:#1f3b2c;--right-line:#63d69a;--right-ink:#b7ebcf;--wrong-bg:#45261f;--wrong-line:#ff8a7a;--wrong-ink:#f5b8ab;--ink-red:#ff8a7a;--ink-green:#63d69a;--ink-blue:#82b4ff;--ink-yellow:#efc65a;--ink-purple:#df94f2;--ink-yellow-edge:transparent;color-scheme:dark;scrollbar-color:#6c8376 var(--bg)}:root[data-theme=dark] [data-color-subject]{--subject-surface:color-mix(in oklab, var(--subject-cover) 22%, var(--bg));--subject-preview-surface:color-mix(in oklab, var(--subject-cover) 16%, var(--bg));--subject-ink:var(--ink)}:root[data-theme=dark] .browse-header a:focus-visible{outline-color:var(--accent)!important}:root[data-theme=dark] .campus-home{--surface-raised:var(--card)}:root[data-theme=dark] .play-discovery .lesson-module.lesson-activity{--lesson-surface:var(--card);--lesson-soft:#1b2b22;--lesson-sage:#213a2d;--lesson-control-border:var(--control-border)}:root[data-theme=dark] .palace-app{--palace-landmark:#302b3f;--palace-landmark-hover:#3a3450;--palace-active-landmark:#1f3a2c;--palace-active-landmark-fill:#27473a;--palace-active-landmark-hover:#2b5040;--palace-ok-bg:#1f3b2c;--palace-ok-ink:#b7ebcf;--palace-assist-bg:#44351b;--palace-assist-ink:#f2d9a6;--palace-assist:#e0c58a;--palace-assist-line:#b9a06a;--palace-miss-bg:#4a2a22;--palace-miss-ink:#f5c3b5;--palace-miss:#f2a58f;--palace-miss-line:#c97b68;--palace-route:#8d82a3}:root[data-theme=dark] .make24-stage{background:var(--apricot)}:root[data-theme=dark] 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