:root{color-scheme:dark;--bg:#101719;--panel:#182123;--panel-2:#1d292b;--line:#ffffff14;--text:#f1f2e9;--muted:#9aa9a7;--lime:#c6ec89;--teal:#80cec4;--amber:#eab87f;--red:#f5a294;--radius:20px;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button{color:inherit}button:disabled{cursor:default;opacity:.65}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--lime);outline-offset:4px}a{color:inherit;text-decoration:none}button{border:0}button svg,svg.icon{width:21px;height:21px;stroke:currentColor;fill:none;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}[hidden]{display:none!important}.topbar{height:80px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 30px;gap:20px}.brand{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:650;letter-spacing:-.7px;min-width:185px}.brand-mark{background:var(--lime);color:var(--bg);border-radius:12px;letter-spacing:-3px;font-size:22px;display:grid;grid-auto-flow:column;place-content:center;width:42px;height:42px;padding-right:3px}.brand-mark span{padding:0 3px}.brand-sub{display:block;font-size:8px;letter-spacing:2px;font-weight:500;margin-top:4px;color:var(--muted)}.chapter-crumb{display:flex;gap:10px;align-items:center;font-size:9px;letter-spacing:1.7px;font-weight:600}.chapter-crumb>span:last-child{color:var(--muted)}.slash{color:#58625f;margin:0 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button{display:flex;align-items:center;gap:12px;min-height:49px;text-align:left;background:transparent;color:#a8b6b2;border-radius:10px;font-size:12px;padding:12px 13px;font-weight:500;white-space:nowrap}.nav-icon{display:flex}.lab-nav button:hover{background:#ffffff05;color:var(--text)}.lab-nav button[aria-pressed=true]{background:#c6ec8911;color:var(--lime)}.lab-nav button[aria-pressed=true] .nav-icon{color:var(--lime)}.nav-count{margin-left:auto;font-size:10px;color:#7b8f88}.sidebar-bottom{margin-top:auto;padding:32px 12px 0}.review-label{display:flex;justify-content:space-between;font-size:8px;letter-spacing:1.3px;color:var(--muted)}.review-label span:last-child{color:var(--lime);letter-spacing:0}.progress-track{height:3px;border-radius:10px;background:#ffffff0c;margin-top:12px;overflow:hidden}.progress-track>span{display:block;height:100%;width:0;background:var(--lime);transition:width .4s}.sidebar-bottom p{font-size:11px;line-height:1.7;color:#849791;margin:11px 0 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h1{font-size:30px;letter-spacing:-1.3px;line-height:1.1;font-weight:500;margin:8px 0 0}.page-heading>p{font-size:11px;color:var(--muted);margin:0;line-height:1.6;max-width:205px;text-align:right}.pill{display:inline-flex;align-items:center;gap:7px;font-size:9px;letter-spacing:1px;color:#c0cbc4;border:1px solid var(--line);border-radius:30px;padding:9px 12px}.hero{position:relative;min-height:360px;height:clamp(340px,46svh,600px);overflow:hidden;border-radius:var(--radius);border:1px solid #ffffff0c;background:radial-gradient(ellipse at 78% 55%,#293832aa,transparent 65%),#131d1e}.hero:after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#131d1e 2%,#131d1ee6 37%,transparent 75%);z-index:1}.hero-image{position:absolute;right:-3%;top:-30%;height:185%;width:62%;object-fit:contain;mix-blend-mode:lighten;filter:saturate(.7)}.hero-copy{position:relative;z-index:2;padding:32px 36px;max-width:65%;height:100%;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.hero h2{font-size:clamp(50px,5.4vw,84px);line-height:.98;letter-spacing:-4px;font-weight:450;margin:19px 0 18px}.hero h2 em{font-family:Georgia,serif;font-weight:400;color:var(--lime);letter-spacing:-3px}.hero-copy>p{color:#a7b7af;font-size:12px;line-height:1.8;margin:0 0 24px;max-width:270px}.hero-tag{position:absolute;right:22px;top:23px;z-index:2;font-size:8px;letter-spacing:2px;color:#8d9b94;writing-mode:vertical-rl}.hero-counter{position:absolute;bottom:28px;right:26px;z-index:2;display:flex;gap:14px;align-items:center}.hero-counter b{font-size:38px;font-weight:350;letter-spacing:-2px}.hero-counter span{font-size:8px;line-height:1.7;letter-spacing:1.7px;color:#abb7af}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:46px;padding:12px 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p{font-size:10px;line-height:1.6;color:#9baca4;margin:0;max-width:195px;padding-right:12px}.mission-arrow{position:absolute;right:17px;bottom:18px;color:#b2c2b9}.learning-note{display:flex;align-items:center;gap:10px;margin-top:18px;font-size:10px;color:#8c9e96}.learning-note svg{width:15px;height:15px;color:var(--lime)}.activity-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,1fr);gap:22px;min-height:530px;height:calc(100svh - 235px);max-height:850px}.model-stage{position:relative;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#101719;min-height:480px;display:flex;justify-content:center;align-items:center}.model-stage:before{content:'';position:absolute;inset:0;background-image:linear-gradient(#abc3ad05 1px,transparent 1px),linear-gradient(90deg,#abc3ad05 1px,transparent 1px);background-size:40px 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#c4d0bd99;border-radius:50%;display:grid;place-items:center;font-size:9px;box-shadow:0 0 0 4px #1017193a;transition:all .2s}.model-pin:hover span,.model-pin.selected span,.model-pin.found span{background:var(--lime);border-color:var(--lime);color:#152218;box-shadow:0 0 0 5px #c6ec8925,0 0 25px #c6ec8945}.model-pin.wrong span{background:#8f4a3e;color:white;border-color:var(--red)}.stage-controls{position:absolute;left:16px;bottom:16px;z-index:5;display:flex;gap:7px}.stage-controls button{min-height:44px;border:1px solid #ffffff24;background:#132124e8;border-radius:8px;padding:8px 12px;font-size:10px;color:#b8cbbf}.stage-controls button[aria-pressed=true]{color:var(--lime);border-color:#c6ec8977}.stage-help{position:absolute;bottom:21px;right:20px;z-index:4;color:#91a297;font-size:8px;letter-spacing:1px}.side-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);padding:28px;display:flex;flex-direction:column;overflow:auto}.segmented{display:flex;padding:4px;border-radius:10px;background:#0d1517;gap:4px;margin-bottom:26px}.segmented button{flex:1;background:transparent;color:#95a99e;min-height:42px;border-radius:7px;font-size:11px;white-space:nowrap;padding:8px 13px}.segmented button[aria-pressed=true]{color:var(--text);background:#293631;box-shadow:0 1px 3px #0005}.bone-number{font-size:9px;letter-spacing:1.8px;color:var(--lime);margin-bottom:14px}.side-panel h2{font-size:clamp(32px,3.5vw,48px);font-weight:450;letter-spacing:-1.7px;line-height:1.1;margin:0 0 14px}.bone-division{font-size:9px;letter-spacing:1.3px;display:inline-flex;align-items:center;gap:7px;color:#a7b7ae;margin-bottom:19px}.bone-description{font-size:14px;line-height:1.7;color:#c4d0c6;margin:0}.cue-box{background:#c6ec8908;border:1px solid #c6ec8924;border-radius:12px;padding:16px;margin:24px 0}.cue-title{display:flex;align-items:center;gap:8px;font-size:9px;letter-spacing:1.3px;color:var(--lime);margin-bottom:9px}.cue-title svg{width:15px;height:15px}.cue-box p{font-size:12px;line-height:1.7;color:#c7d2c6;margin:0}.source-ref{font-size:9px;color:#789084;margin:12px 0}.panel-bottom{margin-top:auto;padding-top:20px}.panel-bottom .btn+.btn{margin-top:10px}.bone-progress{display:flex;gap:4px;margin:16px 0}.bone-progress i{height:4px;flex:1;background:#33423a;border-radius:3px}.bone-progress i.done{background:var(--lime)}.feedback{border-radius:10px;padding:14px 16px;font-size:12px;line-height:1.7;background:#26362b;color:#d5ebce;margin:15px 0}.feedback.error{background:#392c27;color:#f3c7b6}.feedback p{margin:4px 0 0}.mini-caption{font-size:10px;line-height:1.7;color:#90a499}.recall-menu{display:grid;grid-template-columns:1.1fr 1fr;gap:25px;min-height:530px;height:calc(100svh - 235px);max-height:810px}.concept-visual{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:radial-gradient(ellipse at 50% 100%,#28372c,#141d1e 75%);padding:30px;display:flex;flex-direction:column;justify-content:space-between;min-height:440px}.concept-visual img{position:absolute;bottom:-92%;height:180%;left:-22%;width:145%;object-fit:contain;opacity:.6;filter:saturate(.5);mix-blend-mode:lighten}.concept-visual:after{position:absolute;inset:0;content:'';background:linear-gradient(180deg,#141d1e 0%,#141d1e99 34%,transparent 60%,#141d1ee0 100%)}.concept-copy{position:relative;z-index:1}.concept-copy h2{font-size:45px;letter-spacing:-2px;font-weight:450;line-height:1.1;margin:14px 0}.concept-copy h2 em{color:var(--lime);font-family:Georgia,serif;font-weight:400}.concept-copy p{font-size:12px;line-height:1.8;color:#a1b5a9;max-width:240px}.concept-bottom{z-index:1;position:relative;display:flex;align-items:center;gap:14px}.concept-bottom strong{font-size:45px;font-weight:350;letter-spacing:-2px;color:var(--lime)}.concept-bottom span{font-size:10px;line-height:1.7;color:#b2c0b6}.setup-panel{padding:28px 32px;background:var(--panel);border-radius:var(--radius);border:1px solid var(--line);display:flex;flex-direction:column}.setup-panel h2{font-size:27px;font-weight:450;letter-spacing:-.8px;line-height:1.2;margin:15px 0 12px}.setup-panel>p{font-size:12px;line-height:1.8;color:#a8b9ae;margin:0 0 22px}.deck-list{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.deck-choice{min-height:62px;background:#111b1d;border:1px solid var(--line);border-radius:10px;padding:12px;text-align:left;font-size:12px;display:flex;flex-direction:column;gap:5px}.deck-choice span{font-size:9px;color:#8da394}.deck-choice[aria-pressed=true]{border-color:#c6ec8988;background:#c6ec890b;color:var(--lime)}.deck-choice:first-child{grid-column:1/-1;min-height:68px}.form-label{font-size:9px;letter-spacing:1.6px;color:#9bafa2;margin:14px 0 11px;display:block}.question-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:22px;min-height:510px}.question-card{border:1px solid var(--line);background:var(--panel);border-radius:var(--radius);padding:32px;display:flex;flex-direction:column;min-height:510px;position:relative;overflow:hidden}.question-header{display:flex;justify-content:space-between;align-items:center;gap:12px}.question-count{font-size:10px;color:#9eb2a3}.question-card h2{font-size:clamp(25px,3vw,40px);font-weight:450;letter-spacing:-1.2px;line-height:1.3;margin:26px 0 25px;max-width:720px}.question-card textarea{border:1px solid #ffffff1a;border-radius:12px;padding:15px 16px;background:#111a1b;color:var(--text);width:100%;min-height:100px;resize:vertical;font-size:14px;line-height:1.5}.question-card textarea::placeholder{color:#718a7b}.answer-tools{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:8px}.text-btn{background:transparent;display:inline-flex;align-items:center;gap:7px;color:#a9beb0;font-size:10px;min-height:44px}.text-btn svg{width:16px;height:16px}.text-btn.listening{color:var(--red);animation:breathe 1s infinite}.answer-actions{margin-top:auto;padding-top:22px;display:flex;gap:10px}.question-side{display:flex;flex-direction:column;gap:15px}.tip-card{border:1px solid var(--line);border-radius:14px;padding:20px}.tip-card h3{font-weight:500;font-size:14px;margin:12px 0}.tip-card p{font-size:11px;color:#a4b8a9;line-height:1.8;margin:0}.tip-icon{color:var(--lime)}.round-tally{font-size:38px;letter-spacing:-1px;font-weight:400;margin:12px 0 5px}.round-tally small{font-size:12px;letter-spacing:0;color:#94a697}.memory-result{padding:20px;background:#c6ec8910;border:1px solid #c6ec8933;border-radius:12px;margin:0 0 10px}.memory-result .eyebrow{font-size:8px}.memory-result p{font-size:22px;line-height:1.4;margin:10px 0 0;letter-spacing:-.4px}.your-answer{font-size:12px;color:#97ac9d;line-height:1.6;margin:0 0 20px}.your-answer b{color:#c5d4c8;font-weight:500}.player-picker{display:flex;gap:8px}.player-picker button{flex:1;border:1px solid var(--line);border-radius:10px;background:#111b1d;min-height:72px;display:grid;place-content:center;gap:5px;font-size:20px;color:#c3d1c5}.player-picker button small{font-size:9px;color:#92aa99}.player-picker button[aria-pressed=true]{border-color:var(--amber);color:var(--amber);background:#eab87f09}.quiz-setup .concept-copy h2 em{color:var(--amber)}.quiz-setup .concept-bottom strong{color:var(--amber)}.scoreboard{display:grid;grid-template-columns:repeat(var(--players,3),1fr);gap:10px;margin-bottom:18px}.player-score{border:1px solid var(--line);border-radius:11px;padding:12px 16px;display:flex;align-items:center;gap:10px;font-size:11px;color:#98ad9f;background:var(--panel)}.player-score.active{border-color:var(--player,#c6ec89);color:var(--player,#c6ec89);background:color-mix(in srgb,var(--player,#c6ec89) 6%,var(--bg))}.player-avatar{width:26px;height:26px;background:var(--player,#c6ec89);color:#17221b;display:grid;place-items:center;border-radius:50%;font-size:10px;font-weight:600}.player-score b{margin-left:auto;color:var(--text);font-size:18px;font-weight:500}.quiz-card{max-width:950px;margin:0 auto;min-height:460px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:5px 0 18px}.quiz-options button{display:flex;align-items:center;gap:13px;text-align:left;background:#111b1d;border:1px solid var(--line);border-radius:11px;padding:14px;min-height:76px;font-size:12px;line-height:1.45}.option-letter{width:27px;height:27px;flex-shrink:0;display:grid;place-items:center;border:1px solid #ffffff21;border-radius:7px;color:#8fa797;font-size:10px}.quiz-options button.right{border-color:var(--lime);background:#c6ec8915;opacity:1;color:var(--lime)}.quiz-options button.wrong{border-color:var(--red);background:#f5a29412;opacity:1;color:var(--red)}.quiz-options button:disabled:not(.right):not(.wrong){opacity:.38}.pass-screen,.completion{min-height:calc(100svh - 230px);display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:36px;border:1px solid var(--line);border-radius:var(--radius);background:radial-gradient(ellipse at 50% 30%,#2a392c70,transparent 60%),var(--panel)}.pass-orb{width:112px;height:112px;border-radius:50%;border:1px solid #c6ec8966;display:grid;place-items:center;background:radial-gradient(circle at 30% 30%,#c6ec8924,#c6ec8903);color:var(--lime);box-shadow:0 0 0 14px #c6ec8903,0 0 0 15px #c6ec8915;margin-bottom:30px;font-size:52px;font-weight:300}.pass-screen h2,.completion h2{font-size:42px;font-weight:450;letter-spacing:-1.8px;margin:10px 0}.pass-screen p,.completion p{font-size:13px;color:#abc0b0;line-height:1.8;max-width:410px;margin:10px 0 25px}.completion .button-row{justify-content:center}.result-stats{display:flex;gap:38px;margin:20px 0 32px}.result-stats>div b{font-size:43px;font-weight:400;display:block;letter-spacing:-1.5px}.result-stats>div span{font-size:9px;color:#91a99a;letter-spacing:1px}.small-note{font-size:10px;color:#7e9888;line-height:1.8}.small-note a{text-decoration:underline}.toggle-row{display:flex;align-items:center;justify-content:space-between;font-size:11px;line-height:1.6;color:#a6bba9;margin-top:19px;gap:15px}.toggle-row input{accent-color:var(--lime);width:20px;height:20px}.voice-status{font-size:10px;color:var(--amber);line-height:1.6;min-height:18px}.rotated{transform:rotate(180deg)}dialog{color:var(--text);background:#1a2526;border:1px solid #ffffff26;border-radius:22px;padding:38px;max-width:530px;width:calc(100% - 30px);box-shadow:0 30px 100px #0007}dialog::backdrop{background:#071011bb;backdrop-filter:blur(7px)}dialog h2{font-size:37px;font-weight:450;letter-spacing:-1.4px;line-height:1.15;margin:20px 0 28px}.dialog-close{position:absolute;right:16px;top:16px;font-size:25px;color:#9bb09f}.method{display:flex;gap:18px;margin:22px 0}.method>b{font-size:12px;font-weight:500;color:var(--lime);padding-top:3px}.method h3{font-size:14px;font-weight:500;margin:0 0 6px}.method p{font-size:12px;color:#b1c1b4;line-height:1.7;margin:0}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#d8edc2;color:#17261b;font-size:12px;padding:15px 22px;border-radius:12px;box-shadow:0 10px 40px #0005;z-index:100;max-width:90%;line-height:1.5}.fade-in{animation:appear .35s ease both}@keyframes appear{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@keyframes breathe{50%{opacity:.45}}
@media(min-width:1500px){main{padding:36px 5% 18px}.hero{height:49svh}.mission-card{padding:24px;min-height:180px}.mission-card h3{font-size:20px}.mission-card p{font-size:12px}.hero h2{font-size:92px}.hero-copy>p{font-size:15px}.hero-copy{padding-left:50px}}
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@media(min-width:901px) and (max-height:860px){.topbar{height:64px}.app-shell{min-height:calc(100svh - 64px)}main{padding-top:21px}.page-heading{margin-bottom:18px}.page-heading h1{font-size:27px}.hero{min-height:300px;height:40svh}.hero-copy{padding-top:20px;padding-bottom:20px}.hero h2{font-size:60px;margin:15px 0}.hero-copy>p{margin-bottom:18px}.mission-card{min-height:135px;padding:17px}.mission-card h3{margin:13px 0 6px}.section-label{margin-top:18px}.learning-note{margin-top:13px}.activity-layout{min-height:480px;height:calc(100svh - 193px)}.model-stage{min-height:460px}.side-panel{padding:22px}.segmented{margin-bottom:21px}.cue-box{margin:16px 0}.side-panel h2{font-size:34px}.question-layout,.question-card{min-height:480px}.recall-menu{min-height:480px}.lab-footer{margin-top:14px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Keep the skull in view in the chapter introduction. */
.hero-image{top:2%;height:165%}
@media(max-width:1100px){.hero-image{top:3%;height:160%}}
@media(max-width:680px){.hero-image{top:8%;height:125%}}

@media(min-width:681px) and (max-width:900px){.activity-layout{height:min(680px,calc(100svh - 215px));max-height:680px}}