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.option-letter{display:flex;align-items:center;justify-content:center;width:1.75rem;height:1.75rem;background:var(--dark-surface);border-radius:var(--radius-full);font-weight:var(--font-semibold)}.ecosystem-simulation .option-text{flex:1}.ecosystem-simulation .explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg)}.ecosystem-simulation .explanation-box p{margin:0 0 var(--space-4);color:var(--dark-text);font-size:var(--text-sm)}.ecosystem-simulation .quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.ecosystem-simulation .quiz-complete svg{color:var(--accent)}.ecosystem-simulation .info-overlay{position:fixed;inset:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);padding:var(--space-4)}.ecosystem-simulation .info-modal{width:100%;max-width:37.5rem;background:var(--dark-surface);border:.0625rem solid 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li{margin-bottom:var(--space-2)}.human-body-simulation{position:relative;height:100vh}.body-canvas{width:100%;height:100%;display:block;cursor:pointer}.human-body-simulation .back-btn-float{position:absolute;top:var(--space-3);left:var(--space-3);z-index:100;display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;background:var(--dark-surface);border:.0625rem solid var(--dark-border);border-radius:var(--radius-lg);color:var(--dark-text-muted);cursor:pointer;transition:all var(--transition-fast)}.human-body-simulation .back-btn-float:hover{border-color:var(--primary);color:var(--white)}.human-body-simulation .quiz-question{display:flex;flex-direction:column;gap:var(--space-4)}.human-body-simulation .question-text{font-size:var(--text-base);color:var(--white);line-height:1.6}.human-body-simulation .quiz-options{display:flex;flex-direction:column;gap:var(--space-2)}.human-body-simulation .quiz-option{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:var(--dark-surface-2);border:.125rem solid var(--dark-border);border-radius:var(--radius-lg);color:var(--dark-text);font-size:var(--text-sm);cursor:pointer;text-align:left;transition:all var(--transition-fast)}.human-body-simulation .quiz-option:hover:not(:disabled){border-color:var(--primary)}.human-body-simulation .quiz-option.correct{border-color:var(--success);background:#28a74526}.human-body-simulation .quiz-option.incorrect{border-color:var(--danger);background:#dc354526}.human-body-simulation .option-letter{display:flex;align-items:center;justify-content:center;width:1.75rem;height:1.75rem;background:var(--dark-surface);border-radius:var(--radius-full);font-weight:var(--font-semibold)}.human-body-simulation .option-text{flex:1}.human-body-simulation .explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid 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h2{font-size:var(--text-xl);color:var(--white)}.human-body-simulation .info-modal-header button{background:none;border:none;color:var(--dark-text-muted);cursor:pointer}.human-body-simulation .info-modal-content{padding:var(--space-6)}.human-body-simulation .info-modal-content section{margin-bottom:var(--space-6)}.human-body-simulation .info-modal-content h3{color:var(--white);margin-bottom:var(--space-3)}.human-body-simulation .info-modal-content p,.human-body-simulation .info-modal-content li{color:var(--dark-text-muted);font-size:var(--text-sm);line-height:1.6}.human-body-simulation .info-modal-content ul{padding-left:var(--space-4)}.human-body-simulation .info-modal-content li{margin-bottom:var(--space-2)}.evolution-simulation{position:relative;height:100vh}.evolution-canvas{width:100%;height:100%;display:block;cursor:pointer}.evolution-simulation 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.quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.evolution-simulation .quiz-complete svg{color:var(--accent)}.evolution-simulation .info-overlay{position:fixed;inset:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);padding:var(--space-4)}.evolution-simulation .info-modal{width:100%;max-width:37.5rem;background:var(--dark-surface);border:.0625rem solid var(--dark-border);border-radius:var(--radius-2xl);overflow:hidden}.evolution-simulation .info-modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-6);border-bottom:.0625rem solid var(--dark-border)}.evolution-simulation .info-modal-header h2{font-size:var(--text-xl);color:var(--white)}.evolution-simulation .info-modal-header button{background:none;border:none;color:var(--dark-text-muted);cursor:pointer}.evolution-simulation .info-modal-content{padding:var(--space-6)}.evolution-simulation .info-modal-content section{margin-bottom:var(--space-6)}.evolution-simulation .info-modal-content h3{color:var(--white);margin-bottom:var(--space-3)}.evolution-simulation .info-modal-content p,.evolution-simulation .info-modal-content li{color:var(--dark-text-muted);font-size:var(--text-sm);line-height:1.6}.evolution-simulation .info-modal-content ul{padding-left:var(--space-4)}.evolution-simulation .info-modal-content li{margin-bottom:var(--space-2)}.respiration-simulation{position:relative;height:100vh}.respiration-canvas{width:100%;height:100%;display:block}.respiration-simulation .back-btn-float{position:absolute;top:var(--space-3);left:var(--space-3);z-index:100;display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;background:var(--dark-surface);border:.0625rem solid var(--dark-border);border-radius:var(--radius-lg);color:var(--dark-text-muted);cursor:pointer;transition:all var(--transition-fast)}.respiration-simulation .back-btn-float:hover{border-color:var(--primary);color:var(--white)}.respiration-simulation .quiz-question{display:flex;flex-direction:column;gap:var(--space-4)}.respiration-simulation .question-text{font-size:var(--text-base);color:var(--white);line-height:1.6}.respiration-simulation .quiz-options{display:flex;flex-direction:column;gap:var(--space-2)}.respiration-simulation .quiz-option{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:var(--dark-surface-2);border:.125rem solid var(--dark-border);border-radius:var(--radius-lg);color:var(--dark-text);font-size:var(--text-sm);cursor:pointer;text-align:left;transition:all var(--transition-fast)}.respiration-simulation .quiz-option:hover:not(:disabled){border-color:var(--primary)}.respiration-simulation .quiz-option.correct{border-color:var(--success);background:#28a74526}.respiration-simulation .quiz-option.incorrect{border-color:var(--danger);background:#dc354526}.respiration-simulation .option-letter{display:flex;align-items:center;justify-content:center;width:1.75rem;height:1.75rem;background:var(--dark-surface);border-radius:var(--radius-full);font-weight:var(--font-semibold)}.respiration-simulation .option-text{flex:1}.respiration-simulation .explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg)}.respiration-simulation .explanation-box p{margin:0 0 var(--space-4);color:var(--dark-text);font-size:var(--text-sm)}.respiration-simulation .quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.respiration-simulation .quiz-complete svg{color:var(--accent)}.respiration-simulation .info-overlay{position:fixed;inset:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);padding:var(--space-4)}.respiration-simulation .info-modal{width:100%;max-width:37.5rem;background:var(--dark-surface);border:.0625rem solid 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li{margin-bottom:var(--space-2)}