.simulation-engine{height:100vh;display:flex;flex-direction:column;background:var(--dark-bg);overflow:hidden}.sim-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-6);background:var(--dark-surface);border-bottom:.0625rem solid var(--dark-border);height:3.75rem;flex-shrink:0}.sim-header-left{display:flex;align-items:center;gap:var(--space-4)}.sim-title-group{display:flex;flex-direction:column;gap:.125rem}.sim-title{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--white);line-height:1.2}.mode-indicator{display:inline-flex;align-items:center;gap:var(--space-1);font-size:var(--text-xs);color:var(--mode-color);font-weight:var(--font-medium)}.sim-header-center{display:flex;align-items:center;gap:var(--space-4)}.mode-switcher{display:flex;gap:var(--space-1);padding:var(--space-1);background:var(--dark-surface-2);border-radius:var(--radius-lg)}.mode-btn{display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.25rem;background:transparent;border:none;border-radius:var(--radius-md);color:var(--dark-text-muted);cursor:pointer;transition:all var(--transition-fast)}.mode-btn:hover{background:#ffffff0d;color:var(--white)}.mode-btn.active.mode-primary{background:var(--primary);color:var(--white)}.mode-btn.active.mode-accent{background:var(--accent);color:var(--dark-bg)}.mode-btn.active.mode-success{background:var(--success);color:var(--white)}.sim-header-right{display:flex;align-items:center;gap:var(--space-3)}.score-badge,.level-badge{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);background:var(--dark-surface-2);border-radius:var(--radius-lg);font-size:var(--text-sm)}.score-badge{background:#ff9a4426;border:.0625rem solid rgba(255,154,68,.3)}.score-label{color:var(--dark-text-muted)}.score-value{color:var(--accent);font-weight:var(--font-bold)}.level-badge{color:var(--primary-light);font-weight:var(--font-medium)}.header-btn{display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;background:transparent;border:none;color:var(--dark-text-muted);cursor:pointer;border-radius:var(--radius-lg);transition:all var(--transition-fast)}.header-btn:hover{background:var(--glass-bg);color:var(--white)}.sim-content{flex:1;display:flex;overflow:hidden}.sim-canvas-area{flex:1;position:relative;display:flex;flex-direction:column;background:linear-gradient(180deg,var(--dark-bg) 0%,rgba(46,125,153,.05) 100%)}.sim-canvas-wrapper{flex:1;position:relative;overflow:hidden}.sim-playback{position:absolute;bottom:var(--space-6);left:50%;transform:translate(-50%);display:flex;gap:var(--space-2);padding:var(--space-2);background:var(--dark-surface);border:.0625rem solid var(--dark-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl)}.playback-btn{display:flex;align-items:center;justify-content:center;width:3rem;height:3rem;background:var(--dark-surface-2);border:.0625rem solid var(--dark-border);border-radius:var(--radius-lg);color:var(--white);cursor:pointer;transition:all var(--transition-fast)}.playback-btn:hover{background:var(--primary);border-color:var(--primary)}.playback-btn.main{width:3.5rem;height:3.5rem;background:var(--primary);border-color:var(--primary);border-radius:var(--radius-full)}.playback-btn.main.pause{background:var(--accent);border-color:var(--accent)}.sim-control-panel{width:21.25rem;background:var(--dark-surface);border-left:.0625rem solid var(--dark-border);display:flex;flex-direction:column;overflow:hidden}@media(max-width:992px){.sim-control-panel{width:18.75rem}.mode-switcher{display:none}}@media(max-width:768px){.sim-header{flex-wrap:wrap;height:auto;padding:var(--space-3);gap:var(--space-3)}.sim-content{flex-direction:column}.sim-canvas-area{min-height:50vh}.sim-control-panel{width:100%;max-height:40vh}.score-badge,.level-badge{display:none}}.control-panel{display:flex;flex-direction:column;height:100%}.panel-scroll{flex:1;padding:var(--space-4);overflow-y:auto;display:flex;flex-direction:column;gap:var(--space-6)}.panel-section{display:flex;flex-direction:column;gap:var(--space-4)}.section-title{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--dark-text-muted);text-transform:uppercase;letter-spacing:.05em}.section-content{display:flex;flex-direction:column;gap:var(--space-4)}.control-group{display:flex;flex-direction:column;gap:var(--space-2)}.control-label{display:flex;justify-content:space-between;align-items:center;font-size:var(--text-sm);color:var(--dark-text)}.control-value{font-weight:var(--font-semibold);font-family:var(--font-mono, monospace)}.control-slider{-webkit-appearance:none;width:100%;height:.5rem;background:var(--dark-surface-2);border-radius:var(--radius-full);outline:none;cursor:pointer}.control-slider::-webkit-slider-thumb{-webkit-appearance:none;width:1.25rem;height:1.25rem;background:var(--primary);border-radius:var(--radius-full);cursor:pointer;box-shadow:0 0 .625rem #2e7d9980;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.control-slider::-webkit-slider-thumb:hover{transform:scale(1.15);box-shadow:0 0 .9375rem #2e7d99b3}.control-slider.slider-accent::-webkit-slider-thumb{background:var(--accent);box-shadow:0 0 .625rem #ff9a4480}.control-slider.slider-success::-webkit-slider-thumb{background:var(--success);box-shadow:0 0 .625rem #28a74580}.control-range{display:flex;justify-content:space-between;font-size:var(--text-xs);color:var(--gray-500)}.control-toggle{display:flex;justify-content:space-between;align-items:center}.toggle-label{font-size:var(--text-sm);color:var(--dark-text)}.toggle-btn{position:relative;width:3rem;height:1.75rem;background:var(--dark-surface-2);border:.0625rem solid var(--dark-border);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast)}.toggle-btn.active{background:var(--primary);border-color:var(--primary)}.toggle-knob{position:absolute;top:.1875rem;left:.1875rem;width:1.25rem;height:1.25rem;background:var(--white);border-radius:var(--radius-full);transition:transform var(--transition-fast)}.toggle-btn.active .toggle-knob{transform:translate(1.25rem)}.control-select{width:100%;padding:var(--space-3);background:var(--dark-surface-2);border:.0625rem solid var(--dark-border);border-radius:var(--radius-lg);color:var(--white);font-size:var(--text-sm);cursor:pointer;outline:none;transition:border-color var(--transition-fast)}.control-select:hover,.control-select:focus{border-color:var(--primary)}.control-select option{background:var(--dark-surface);color:var(--white)}.data-display{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-3)}.data-item{padding:var(--space-3);background:var(--dark-surface-2);border-radius:var(--radius-lg);display:flex;flex-direction:column;gap:var(--space-1)}.data-label{font-size:var(--text-xs);color:var(--dark-text-muted)}.data-value{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--white);font-family:var(--font-mono, monospace)}.data-unit{font-size:var(--text-sm);color:var(--dark-text-muted);margin-left:var(--space-1)}.tip-box{display:flex;gap:var(--space-3);padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg)}.tip-box svg{flex-shrink:0;color:var(--primary-light)}.tip-box p{font-size:var(--text-sm);color:var(--dark-text-muted);line-height:1.5;margin:0}@media(max-width:768px){.data-display{grid-template-columns:repeat(4,1fr)}}.motion-track-simulation{position:relative;height:100vh}.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)}.back-btn-float:hover{border-color:var(--primary);color:var(--white)}.motion-canvas{width:100%;height:100%;display:block}.quiz-question{display:flex;flex-direction:column;gap:var(--space-4)}.question-text{font-size:var(--text-base);color:var(--white);line-height:1.6;margin:0}.quiz-options{display:flex;flex-direction:column;gap:var(--space-2)}.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;transition:all var(--transition-fast);text-align:left}.quiz-option:hover:not(:disabled){border-color:var(--primary);background:#2e7d991a}.quiz-option:disabled{cursor:not-allowed}.quiz-option.correct{border-color:var(--success);background:#28a74526;color:var(--success-light)}.quiz-option.incorrect{border-color:var(--danger);background:#dc354526;color:var(--danger)}.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);font-size:var(--text-sm)}.quiz-option.correct .option-letter{background:var(--success);color:var(--white)}.quiz-option.incorrect .option-letter{background:var(--danger);color:var(--white)}.option-text{flex:1}.quiz-option svg{margin-left:auto}.explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg);overflow:hidden}.explanation-box p{color:var(--dark-text);font-size:var(--text-sm);line-height:1.6;margin:0 0 var(--space-4)}.explanation-box .btn{width:100%}.quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);padding:var(--space-4);text-align:center}.quiz-complete svg{color:var(--accent)}.quiz-complete p{font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--white);margin:0}.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)}.info-modal{width:100%;max-width:37.5rem;max-height:80vh;background:var(--dark-surface);border:.0625rem solid var(--dark-border);border-radius:var(--radius-2xl);display:flex;flex-direction:column;overflow:hidden}.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)}.info-modal-header h2{font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--white);margin:0}.info-modal-header button{display:flex;align-items:center;justify-content:center;width:2.25rem;height:2.25rem;background:transparent;border:none;color:var(--dark-text-muted);cursor:pointer;border-radius:var(--radius-lg);transition:all var(--transition-fast)}.info-modal-header button:hover{background:var(--glass-bg);color:var(--white)}.info-modal-content{flex:1;padding:var(--space-6);overflow-y:auto}.info-modal-content section{margin-bottom:var(--space-6)}.info-modal-content section:last-child{margin-bottom:0}.info-modal-content h3{font-size:var(--text-base);font-weight:var(--font-semibold);color:var(--white);margin-bottom:var(--space-3)}.info-modal-content p{font-size:var(--text-sm);color:var(--dark-text-muted);line-height:1.6;margin:0}.info-modal-content ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-2)}.info-modal-content li{position:relative;padding-left:var(--space-5);font-size:var(--text-sm);color:var(--dark-text-muted)}.info-modal-content li:before{content:"✓";position:absolute;left:0;color:var(--success)}.formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(9.375rem,1fr));gap:var(--space-3)}.formula-card{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);padding:var(--space-4);background:var(--dark-surface-2);border:.0625rem solid var(--dark-border);border-radius:var(--radius-lg)}.formula-title{font-size:var(--text-xs);color:var(--dark-text-muted);text-transform:uppercase;letter-spacing:.05em}.formula{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--primary-light);font-family:var(--font-mono, monospace)}@media(max-width:768px){.info-modal{max-height:90vh}.formula-grid{grid-template-columns:1fr}}.force-arena-simulation{position:relative;height:100vh}.force-canvas{width:100%;height:100%;display:block}.force-arena-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)}.force-arena-simulation .back-btn-float:hover{border-color:var(--primary);color:var(--white)}.force-arena-simulation .quiz-question{display:flex;flex-direction:column;gap:var(--space-4)}.force-arena-simulation .question-text{font-size:var(--text-base);color:var(--white);line-height:1.6;margin:0}.force-arena-simulation .quiz-options{display:flex;flex-direction:column;gap:var(--space-2)}.force-arena-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;transition:all var(--transition-fast);text-align:left}.force-arena-simulation .quiz-option:hover:not(:disabled){border-color:var(--primary)}.force-arena-simulation .quiz-option.correct{border-color:var(--success);background:#28a74526}.force-arena-simulation .quiz-option.incorrect{border-color:var(--danger);background:#dc354526}.force-arena-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)}.force-arena-simulation .option-text{flex:1}.force-arena-simulation .explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg)}.force-arena-simulation .explanation-box p{margin:0 0 var(--space-4);color:var(--dark-text);font-size:var(--text-sm)}.force-arena-simulation .quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2);text-align:center}.force-arena-simulation .quiz-complete svg{color:var(--accent)}.force-arena-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)}.force-arena-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}.force-arena-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)}.force-arena-simulation .info-modal-header h2{font-size:var(--text-xl);color:var(--white)}.force-arena-simulation .info-modal-header button{background:none;border:none;color:var(--dark-text-muted);cursor:pointer}.force-arena-simulation .info-modal-content{padding:var(--space-6)}.force-arena-simulation .info-modal-content section{margin-bottom:var(--space-6)}.force-arena-simulation .info-modal-content h3{color:var(--white);margin-bottom:var(--space-3)}.force-arena-simulation .info-modal-content p,.force-arena-simulation .info-modal-content li{color:var(--dark-text-muted);font-size:var(--text-sm)}.force-arena-simulation .formula-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-3)}.force-arena-simulation .formula-card{display:flex;flex-direction:column;align-items:center;padding:var(--space-4);background:var(--dark-surface-2);border-radius:var(--radius-lg)}.force-arena-simulation .formula-title{font-size:var(--text-xs);color:var(--dark-text-muted)}.force-arena-simulation .formula{font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--primary-light)}.fluid-world-simulation{position:relative;height:100vh}.fluid-canvas{width:100%;height:100%;display:block}.fluid-world-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)}.fluid-world-simulation .back-btn-float:hover{border-color:var(--primary);color:var(--white)}.fluid-world-simulation .quiz-question{display:flex;flex-direction:column;gap:var(--space-4)}.fluid-world-simulation .question-text{font-size:var(--text-base);color:var(--white);line-height:1.6}.fluid-world-simulation .quiz-options{display:flex;flex-direction:column;gap:var(--space-2)}.fluid-world-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)}.fluid-world-simulation .quiz-option:hover:not(:disabled){border-color:var(--primary)}.fluid-world-simulation .quiz-option.correct{border-color:var(--success);background:#28a74526}.fluid-world-simulation .quiz-option.incorrect{border-color:var(--danger);background:#dc354526}.fluid-world-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)}.fluid-world-simulation .option-text{flex:1}.fluid-world-simulation .explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg)}.fluid-world-simulation .explanation-box p{margin:0 0 var(--space-4);color:var(--dark-text);font-size:var(--text-sm)}.fluid-world-simulation .quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.fluid-world-simulation .quiz-complete svg{color:var(--accent)}.fluid-world-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)}.fluid-world-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}.fluid-world-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)}.fluid-world-simulation .info-modal-header h2{font-size:var(--text-xl);color:var(--white)}.fluid-world-simulation .info-modal-header button{background:none;border:none;color:var(--dark-text-muted);cursor:pointer}.fluid-world-simulation .info-modal-content{padding:var(--space-6)}.fluid-world-simulation .info-modal-content section{margin-bottom:var(--space-6)}.fluid-world-simulation .info-modal-content h3{color:var(--white);margin-bottom:var(--space-3)}.fluid-world-simulation .info-modal-content p,.fluid-world-simulation .info-modal-content li{color:var(--dark-text-muted);font-size:var(--text-sm);line-height:1.6}.fluid-world-simulation .info-modal-content ul{padding-left:var(--space-4)}.fluid-world-simulation .info-modal-content li{margin-bottom:var(--space-2)}.energy-conservation-simulation{position:relative;height:100vh}.energy-canvas{width:100%;height:100%;display:block}.energy-conservation-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)}.energy-conservation-simulation .back-btn-float:hover{border-color:var(--primary);color:var(--white)}.energy-conservation-simulation .quiz-question{display:flex;flex-direction:column;gap:var(--space-4)}.energy-conservation-simulation .question-text{font-size:var(--text-base);color:var(--white);line-height:1.6}.energy-conservation-simulation .quiz-options{display:flex;flex-direction:column;gap:var(--space-2)}.energy-conservation-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)}.energy-conservation-simulation .quiz-option:hover:not(:disabled){border-color:var(--primary)}.energy-conservation-simulation .quiz-option.correct{border-color:var(--success);background:#28a74526}.energy-conservation-simulation .quiz-option.incorrect{border-color:var(--danger);background:#dc354526}.energy-conservation-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)}.energy-conservation-simulation .option-text{flex:1}.energy-conservation-simulation .explanation-box{padding:var(--space-4);background:#2e7d991a;border:.0625rem solid rgba(46,125,153,.2);border-radius:var(--radius-lg)}.energy-conservation-simulation .explanation-box p{margin:0 0 var(--space-4);color:var(--dark-text);font-size:var(--text-sm)}.energy-conservation-simulation .quiz-complete{display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.energy-conservation-simulation .quiz-complete svg{color:var(--accent)}.energy-conservation-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)}.energy-conservation-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}.energy-conservation-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)}.energy-conservation-simulation .info-modal-header h2{font-size:var(--text-xl);color:var(--white)}.energy-conservation-simulation .info-modal-header 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