:root{--primary:#2b579a;--primary-dark:#1e4a8f;--primary-light:#3d6bc5;--secondary:#605e5c;--accent:#107c10;--accent-alt:#0078d4;--success:#0dbc79;--warning:#ff9d00;--error:#dc3545;--app-bg:#f8fafc;--surface:#ffffff26;--surface-alt:#f1f5f926;--surface-elevated:#fff3;--text-primary:#1e293b;--text-secondary:#64748b;--text-tertiary:#94a3b8;--text-on-primary:#fff;--border:#e2e8f066;--border-strong:#cbd5e1b3;--divider:#e2e8f080;--shadow-sm:0 1px 2px #0000000a;--shadow-md:0 2px 4px #00000014;--shadow-lg:0 4px 8px #0000001f;--shadow-xl:0 8px 16px #00000029;--shadow-glass:0 8px 32px #0003, 0 0 0 1px #fff3 inset;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--spacing-xs:6px;--spacing-sm:8px;--spacing-md:12px;--spacing-lg:16px;--spacing-xl:20px;--spacing-2xl:24px;--transition-fast:.12s cubic-bezier(.2, 0, 0, 1);--transition-normal:.2s cubic-bezier(.2, 0, 0, 1);--transition-slow:.3s cubic-bezier(.2, 0, 0, 1);--footer-height:28px;--blur-amount:20px;--wave-color:#a0b4dc4d;--wave-color-alt:#c8a0dc4d;--overlay-color:#00000008}.light{--primary:#2b579a;--primary-dark:#1e4a8f;--primary-light:#3d6bc5;--secondary:#605e5c;--accent:#107c10;--accent-alt:#0078d4;--success:#0dbc79;--warning:#ff9d00;--error:#dc3545;--app-bg:#f8fafc;--surface:#ffffff26;--surface-alt:#f1f5f926;--surface-elevated:#fff3;--text-primary:#1e293b;--text-secondary:#64748b;--text-tertiary:#94a3b8;--text-on-primary:#fff;--border:#e2e8f066;--border-strong:#cbd5e1b3;--divider:#e2e8f080;--shadow-sm:0 1px 2px #0000000a;--shadow-md:0 2px 4px #00000014;--shadow-lg:0 4px 8px #0000001f;--shadow-xl:0 8px 16px #00000029}.dark{--primary:#4f9bff;--primary-dark:#3b78d8;--primary-light:#60a9ff;--secondary:#b3b0ad;--accent:#0dbd6d;--accent-alt:#1c8fff;--success:#1ed690;--warning:#ffb340;--error:#e74c3c;--app-bg:#1a1f2e;--surface:#1e293b26;--surface-alt:#33415526;--surface-elevated:#2d374833;--text-primary:#f1f5f9;--text-secondary:#a0aec0;--border:#47556966;--border-strong:#64748bb3;--divider:#33415580;--shadow-sm:0 1px 2px #0003;--shadow-md:0 2px 8px #00000040;--shadow-lg:0 4px 12px #0000004d;--shadow-xl:0 8px 24px #00000059;--shadow-glass:0 8px 32px #0006, 0 0 0 1px #ffffff26 inset;--wave-color:#6478b466;--wave-color-alt:#9664b466;--overlay-color:#ffffff08}@media (prefers-color-scheme:dark){:root:not(.light){--primary:#4f9bff;--primary-dark:#3b78d8;--primary-light:#60a9ff;--secondary:#b3b0ad;--accent:#0dbd6d;--accent-alt:#1c8fff;--success:#1ed690;--warning:#ffb340;--error:#e74c3c;--app-bg:#1a1f2e;--surface:#1e293b26;--surface-alt:#33415526;--surface-elevated:#2d374833;--text-primary:#f1f5f9;--text-secondary:#a0aec0;--border:#47556966;--border-strong:#64748bb3;--divider:#33415580;--shadow-sm:0 1px 2px #0003;--shadow-md:0 2px 8px #00000040;--shadow-lg:0 4px 12px #0000004d;--shadow-xl:0 8px 24px #00000059;--shadow-glass:0 8px 32px #0006, 0 0 0 1px #ffffff26 inset;--wave-color:#6478b466;--wave-color-alt:#9664b466;--overlay-color:#ffffff08}.dark .difficulty-select,.dark .scope-select{color:#f1f5f9;background-color:#2d3748;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a0aec0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");border-color:#4a5568}.dark .difficulty-select option,.dark .scope-select option{color:#f1f5f9;background-color:#2d3748}.dark .difficulty-select:hover,.dark .scope-select:hover{background-color:#374151;border-color:#6b7280}.dark .difficulty-select:focus-visible{outline:2px solid var(--primary-light);outline-offset:1px}.dark .scope-select:focus-visible{outline:2px solid var(--primary-light);outline-offset:1px}}*{box-sizing:border-box;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;margin:0;padding:0}html{background:var(--app-bg);min-height:100%;font-size:15px}body{color:var(--text-primary);background:0 0;min-height:100dvh;font-family:Noto Sans,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;transition:background-color .3s,color .3s;overflow-x:hidden}@font-face{font-family:Noto Sans;src:url(/NotoSans-VariableFont_wdth_wght.ttf);font-display:swap;font-weight:1 1000}@font-face{font-family:Libertinus Math;src:url(/LibertinusMath-Regular.ttf);font-display:swap}#wave-container{z-index:0;pointer-events:none;contain:layout style paint;width:100%;height:100%;position:fixed;top:0;left:0;overflow:hidden}.liquid-bg{background:radial-gradient(circle at 30% 50%, var(--wave-color) 0%, transparent 70%);filter:blur(15px);opacity:.65;will-change:transform;width:140%;height:150%;animation:60s ease-in-out infinite alternate flowLiquid;position:absolute;top:-20%;left:-20%;transform:translateZ(0)}@keyframes flowLiquid{0%{transform:translate(0)rotate(0)scale(1)}to{transform:translate(-3%,-1%)rotate(.5deg)scale(1.05)}}@media (prefers-reduced-motion:reduce){.liquid-bg{animation:none}}#blur-layer{width:100%;height:100%;-webkit-backdrop-filter:blur(var(--blur-amount));pointer-events:none;z-index:1;-webkit-backface-visibility:hidden;backface-visibility:hidden;background:0 0;position:fixed;top:0;left:0;transform:translateZ(0)}.app-container{z-index:2;background:0 0;flex-direction:column;width:100%;min-height:100dvh;display:flex;position:relative;overflow:hidden}.app-content{max-width:1600px;padding:var(--spacing-lg);gap:var(--spacing-lg);flex-direction:column;flex:1;width:100%;margin:0 auto;display:flex}.control-toolbar,.card,.main-content,.question-display,.answer-input,.stat-with-icon,.difficulty-select,.scope-select,.icon-button,.primary-button,.secondary-button,.topic-pill,.modal-content,.modal-header,.modal-footer,.setting-item select,.setting-item input[type=number],.math-toolbar-btn{background:var(--surface)}.control-toolbar{background:var(--surface);border-radius:var(--radius-md);border:1px solid var(--border);padding:var(--spacing-sm) var(--spacing-md);box-shadow:var(--shadow-glass);gap:var(--spacing-sm);transition:all var(--transition-normal), background-color .3s ease;flex-direction:column;display:flex}.control-toolbar:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass), 0 16px 48px #00000040, 0 0 0 1px #ffffff1a inset;border-color:#ffffff4d;transform:translateY(-1px)}.toolbar-row-top{align-items:center;gap:var(--spacing-md);flex-wrap:wrap;width:100%;display:flex}.toolbar-row-bottom{justify-content:space-between;align-items:center;gap:var(--spacing-sm);flex-wrap:wrap;width:100%;display:flex}.toolbar-section{flex:1}.toolbar-title{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;padding:2px var(--spacing-sm);background:var(--surface-alt);border-radius:var(--radius-sm);transition:color var(--transition-fast), background-color .3s ease;border:1px solid var(--border);margin-bottom:4px;font-size:.7rem;font-weight:600;display:inline-block}.toolbar-title:hover{color:var(--primary);background:var(--surface-elevated);border-color:#ffffff4d}.utility-buttons{gap:var(--spacing-xs);flex-shrink:0;margin-left:auto;display:flex}.topic-pills-container{padding-right:var(--spacing-xs);flex-wrap:wrap;gap:6px;max-height:15dvh;padding-top:.4rem;padding-bottom:.4rem;padding-right:1dvh;display:flex;overflow-y:auto}.topic-pill{padding:2px var(--spacing-sm);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-normal), background-color .3s ease, border-color .3s ease;color:var(--text-primary);white-space:nowrap;box-shadow:var(--shadow-sm);align-items:center;gap:4px;font-size:.7rem;display:flex}.topic-pill:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass), 0 8px 20px #0000001a;border-color:#ffffff4d;transform:translateY(-2px)}.topic-pill.active{background:var(--primary);color:var(--text-on-primary);border-color:var(--primary);box-shadow:0 4px 12px #2b579a4d}.topic-pill-icon{font-size:.65rem;font-weight:600}.topic-pill-name{font-weight:500}.mode-selector{background:var(--surface-alt);border-radius:var(--radius-full);border:1px solid var(--border);box-shadow:var(--shadow-sm);flex-shrink:0;padding:2px;font-size:.7rem;display:flex}.mode-button{padding:4px var(--spacing-md);border-radius:var(--radius-full);cursor:pointer;color:var(--text-secondary);transition:all var(--transition-normal), background-color .3s ease;background:0 0;border:none;font-size:.7rem;font-weight:500}.mode-button:hover{color:var(--primary);background:var(--surface);box-shadow:var(--shadow-glass)}.mode-button.active{background:var(--surface);color:var(--text-primary);box-shadow:var(--shadow-glass)}.mode-button.disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.primary-button,.secondary-button{padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-normal), background-color .3s ease;white-space:nowrap;border:none;justify-content:center;align-items:center;font-family:inherit;font-size:.8rem;font-weight:600;display:flex}.primary-button{background:var(--accent-alt);color:var(--text-on-primary);box-shadow:var(--shadow-glass);border:1px solid #fff3}.primary-button:hover:not(:disabled){background:var(--primary-dark);box-shadow:var(--shadow-glass), 0 12px 28px #00000040, 0 0 0 1px #ffffff4d inset;border-color:#fff6;transform:translateY(-2px)}.primary-button:active:not(:disabled){transform:translateY(0)}.secondary-button{background:var(--surface);color:var(--text-primary);border:1px solid var(--border)}.secondary-button:hover:not(:disabled){background:var(--surface-elevated);box-shadow:var(--shadow-glass), 0 12px 28px #0003, 0 0 0 1px #fff3 inset;border-color:#ffffff4d;transform:translateY(-2px)}.primary-button:disabled,.secondary-button:disabled{opacity:.5;cursor:not-allowed}.icon-button{border-radius:var(--radius-full);background:var(--surface-alt);width:28px;height:28px;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-normal), background-color .3s ease, border-color .3s ease;border:none;border:1px solid var(--border);box-shadow:var(--shadow-sm);justify-content:center;align-items:center;display:flex}.icon-button:hover{background:var(--surface-elevated);color:var(--primary);box-shadow:var(--shadow-glass), 0 8px 20px #00000026;border-color:#fff6;transform:translateY(-2px)scale(1.05)}.icon-button:active{transform:translateY(0)scale(1)}.icon-button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.icon-button svg{width:14px;height:14px}kbd.shortcut-hint{background:var(--surface-alt);border-radius:var(--radius-sm);opacity:.8;border:1px solid var(--border);box-shadow:var(--shadow-sm);margin-left:8px;padding:2px 6px;font-family:monospace;font-size:.65rem}.stat-with-icon{color:var(--text-primary);background:var(--surface-alt);border-radius:var(--radius-full);border:1px solid var(--border);transition:border-color var(--transition-fast), box-shadow var(--transition-fast), background-color .3s ease;box-shadow:var(--shadow-sm);align-items:center;gap:4px;padding:2px 8px;font-size:.8rem;font-weight:600;display:inline-flex}.stat-with-icon:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass);border-color:#ffffff4d}.stat-with-icon svg{width:14px;height:14px}#single-controls{align-items:center;gap:var(--spacing-md);width:100%;display:flex}.single-actions{gap:var(--spacing-sm);flex-shrink:0;display:flex}.auto-controls{align-items:center;gap:var(--spacing-md);padding-left:var(--spacing-md);border-left:1px solid var(--border);transition:border-color var(--transition-fast);margin-left:auto;display:flex}.auto-controls:hover{border-left-color:var(--primary-light)}#mental-controls{gap:var(--spacing-sm);flex-direction:column;width:100%;display:flex}.mental-stats{align-items:center;gap:var(--spacing-md);display:flex}.mental-extra-controls{align-items:center;gap:var(--spacing-md);flex-wrap:wrap;display:flex}.mental-progress{background:var(--border);border-radius:var(--radius-full);width:100%;height:4px;box-shadow:var(--shadow-sm);margin-top:2px;overflow:hidden}.progress-bar{background:var(--primary);height:100%;transition:width .2s,background-color .3s}.difficulty-select,.scope-select{padding:var(--spacing-xs) var(--spacing-xl) var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-full);border:1px solid var(--border);background:var(--surface);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast), background-color .3s ease, border-color .3s ease;-webkit-appearance:none;appearance:none;box-shadow:var(--shadow-sm);background-image:url("data:image/svg+xml;utf8,<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"16\" height=\"16\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"%2364748B\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><polyline points=\"6 9 12 15 18 9\"/></svg>");background-position:right 8px center;background-repeat:no-repeat;background-size:12px;font-size:.75rem}.difficulty-select:hover,.scope-select:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass);border-color:#ffffff4d}.difficulty-select:focus-visible{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light);outline:none}.scope-select:focus-visible{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light);outline:none}.difficulty-select option,.scope-select option{background:var(--surface-elevated);color:var(--text-primary);padding:var(--spacing-xs)}.auto-toggle,.shuffle-toggle{color:var(--text-secondary);cursor:pointer;transition:color var(--transition-fast);align-items:center;gap:6px;padding:2px 0;font-size:.75rem;display:flex}.auto-toggle:hover,.shuffle-toggle:hover{color:var(--primary)}.auto-toggle input[type=checkbox],.shuffle-toggle input[type=checkbox]{-webkit-appearance:none;appearance:none;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface);cursor:pointer;width:16px;height:16px;transition:all var(--transition-fast), background-color .3s ease, border-color .3s ease;box-shadow:var(--shadow-sm);position:relative}.auto-toggle input[type=checkbox]:hover,.shuffle-toggle input[type=checkbox]:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass);border-color:#fff6}input[type=checkbox]:hover{cursor:pointer}.auto-toggle input[type=checkbox]:checked,.shuffle-toggle input[type=checkbox]:checked{background:var(--primary);border-color:var(--primary)}.auto-toggle input[type=checkbox]:checked:after,.shuffle-toggle input[type=checkbox]:checked:after{content:"";border:2px solid #fff;border-width:0 2px 2px 0;width:4px;height:8px;position:absolute;top:1px;left:4px;transform:rotate(45deg)}.auto-toggle input[type=checkbox]:focus-visible{box-shadow:0 0 0 2px var(--primary-light);outline:none}.shuffle-toggle input[type=checkbox]:focus-visible{box-shadow:0 0 0 2px var(--primary-light);outline:none}#timer-display,#score-display{color:var(--text-primary);background:var(--surface-alt);border-radius:var(--radius-full);border:1px solid var(--border);transition:border-color var(--transition-fast), box-shadow var(--transition-fast), background-color .3s ease;box-shadow:var(--shadow-sm);padding:2px 8px;font-size:.8rem;font-weight:600}#timer-display:hover,#score-display:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass);border-color:#ffffff4d}#start-session{padding:var(--spacing-xs) var(--spacing-md);font-size:.75rem}#start-session.stop-session{background:var(--error);color:#fff;border-color:var(--error)}#start-session.stop-session:hover{background:#c0392b}.main-content{gap:var(--spacing-md);background:var(--surface);border-radius:var(--radius-lg);border:1px solid var(--border);padding:var(--spacing-md);box-shadow:var(--shadow-glass);transition:border-color var(--transition-fast), box-shadow var(--transition-fast), background-color .3s ease;flex-direction:column;display:flex;overflow-y:auto}.main-content:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass), 0 16px 48px #00000040;border-color:#ffffff4d}.content-stack{gap:var(--spacing-md);flex-direction:column;display:flex}.answer-section{gap:var(--spacing-md);grid-template-columns:1fr 1fr;display:grid}.card{background:var(--surface-elevated);border-radius:var(--radius-lg);border:1px solid var(--border);transition:all var(--transition-normal), background-color .3s ease;box-shadow:var(--shadow-glass);animation:.3s cardFadeIn;overflow:hidden}.card:hover{box-shadow:var(--shadow-glass), 0 20px 56px #0000004d, 0 0 0 1px #fff3 inset;background:#ffffff40;border-color:#fff6;transform:translateY(-2px)}.dark .card:hover{background:#2d37484d}@keyframes cardFadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.card-header{padding:var(--spacing-sm) var(--spacing-md);border-bottom:1px solid var(--divider);background:var(--surface-alt);transition:opacity var(--transition-fast), background-color .3s ease;justify-content:space-between;align-items:center;display:flex}.card:hover .card-header{opacity:1}.card-title{color:var(--text-primary);align-items:center;gap:var(--spacing-xs);font-size:.875rem;font-weight:600;transition:color .3s;display:flex}.card-title:before{content:"";background:var(--primary);border-radius:50%;width:5px;height:5px;transition:background-color .3s;display:block}.card-subtitle{color:var(--text-secondary);background:var(--surface);border-radius:var(--radius-full);border:1px solid var(--border);transition:color var(--transition-fast), border-color var(--transition-fast), background-color .3s ease;box-shadow:var(--shadow-sm);padding:2px 6px;font-size:.7rem;font-weight:500}.card:hover .card-subtitle{color:var(--primary);background:var(--surface-elevated);border-color:#ffffff4d}.card-content{padding:var(--spacing-md)}.question-display{text-align:center;min-height:80px;color:var(--text-primary);padding:var(--spacing-md);background:var(--app-bg);border-radius:var(--radius-md);border:1px dashed var(--border);transition:border-color var(--transition-fast), background-color .3s ease;box-shadow:var(--shadow-sm);flex-direction:column;justify-content:center;align-items:center;font-size:1rem;line-height:1.5;display:flex;overflow-x:auto}.question-display.has-content{border:1px solid var(--border);background:var(--surface-alt)}.question-display:hover{border-color:var(--primary-light)}.empty-state{align-items:center;gap:var(--spacing-sm);color:var(--text-tertiary);flex-direction:column;display:flex}.empty-state svg{opacity:.5;width:40px;height:40px}.empty-state p{text-align:center;max-width:200px;font-size:.8rem}.loading-state{align-items:center;gap:var(--spacing-sm);color:var(--text-secondary);flex-direction:column;display:flex}.answer-input{width:100%;min-height:70px;padding:var(--spacing-sm) var(--spacing-md);color:var(--text-primary);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);resize:vertical;transition:border-color var(--transition-fast), box-shadow var(--transition-fast), background-color .3s ease;box-shadow:var(--shadow-sm);font-family:inherit;font-size:.875rem;line-height:1.5}.answer-input:focus{border-color:var(--primary);box-shadow:0 0 0 2px #2b579a1a, var(--shadow-glass);outline:none}.answer-input:disabled{opacity:.6;cursor:not-allowed;background:var(--surface-alt)}#topic-search{width:100%;min-height:28px;padding:4px var(--spacing-sm);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-full);color:var(--text-primary);transition:all var(--transition-fast);box-shadow:var(--shadow-sm);margin-bottom:.5rem;font-size:.8rem}#topic-search:focus{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light);outline:none}.answer-input-wrapper{position:relative}#clear-answer{background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius-full);cursor:pointer;width:24px;height:24px;transition:all var(--transition-fast);z-index:5;justify-content:center;align-items:center;display:none;position:absolute;top:50%;right:8px;transform:translateY(-50%)}#clear-answer:hover{background:var(--surface-elevated);border-color:var(--primary);transform:translateY(-50%)scale(1.1)}#clear-answer svg{width:14px;height:14px;color:var(--text-secondary)}#clear-answer:hover svg{color:var(--primary)}.answer-input:not(:placeholder-shown)+#clear-answer{display:flex}.symbols-hint{margin-top:var(--spacing-sm);align-items:center;gap:var(--spacing-xs);color:var(--text-secondary);font-size:.7rem;display:flex}.hint-label{font-weight:500}.symbols-list{color:var(--text-primary);background:var(--surface-alt);border-radius:var(--radius-sm);border:1px solid var(--border);box-shadow:var(--shadow-sm);padding:1px 4px;font-family:monospace;font-size:.7rem}.expected-format{margin-top:var(--spacing-sm);color:var(--text-secondary);padding:var(--spacing-xs) var(--spacing-sm);background:var(--surface-alt);border-radius:var(--radius-sm);border:1px dashed var(--border);font-size:.7rem;font-style:italic}.results-display{text-align:center;min-height:60px;color:var(--text-primary);padding:var(--spacing-sm);background:var(--app-bg);border-radius:var(--radius-md);border:1px dashed var(--border);box-shadow:var(--shadow-sm);flex-direction:column;justify-content:center;align-items:center;font-size:.8rem;line-height:1.5;display:flex}.results-display.has-content{border:1px solid var(--border);background:var(--surface-alt)}.results-display.correct{border:1px solid var(--success);color:var(--success);background:#0dbc791a}.results-display.incorrect{border:1px solid var(--error);color:var(--error);background:#dc35451a}.result-success,.result-error{align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm);width:100%;display:flex}.result-success svg,.result-error svg{flex-shrink:0;width:20px;height:20px}.result-success h3,.result-error h3{margin-bottom:2px;font-size:.9rem}.result-success p,.result-error p{color:var(--text-secondary);font-size:.8rem}.app-footer{height:var(--footer-height);background:var(--surface);border-top:1px solid var(--border);box-shadow:var(--shadow-glass);justify-content:center;align-items:center;display:flex}.footer-content{gap:var(--spacing-lg);color:var(--text-secondary);font-size:.75rem;display:flex}.footer-text{opacity:.7}.mjx-chtml,.MathJax_Display{max-width:100%;display:block;overflow-x:auto;color:var(--text-primary)!important}.mjx-container{max-width:100%;overflow:auto hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--surface-alt);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:var(--radius-full);background-clip:content-box;border:2px solid #0000}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.notification{top:var(--spacing-lg);right:var(--spacing-lg);padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-md);background:var(--surface-elevated);-webkit-backdrop-filter:blur(calc(var(--blur-amount) * 2));border-left:4px solid var(--primary);box-shadow:var(--shadow-lg);color:var(--text-primary);z-index:1000;border:1px solid var(--border);font-size:.8rem;animation:.2s slideIn;position:fixed}.notification-warning{border-left-color:var(--warning)}.notification.fade-out{animation:.2s forwards fadeOut}@keyframes fadeOut{to{opacity:0;transform:translateY(-10px)}}@keyframes slideIn{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@media (max-width:1024px){.answer-section{grid-template-columns:1fr}.toolbar-row-bottom{flex-direction:column;align-items:stretch}#single-controls{flex-wrap:wrap}.auto-controls{border-left:none;justify-content:flex-start;width:100%;margin-left:0;padding-left:0}.mental-stats{flex-wrap:wrap}}@media (max-width:768px){.app-content{padding:var(--spacing-md)}.control-toolbar{padding:var(--spacing-xs)}.toolbar-row-top{flex-direction:column;align-items:stretch}.mode-selector{margin-bottom:var(--spacing-xs);align-self:flex-start}.utility-buttons{justify-content:flex-end;margin-left:0}.card-header{padding:var(--spacing-sm);align-items:flex-start;gap:var(--spacing-xs);flex-direction:column}.card-content{padding:var(--spacing-sm)}.footer-content{gap:var(--spacing-xs);text-align:center;flex-direction:column;font-size:.7rem}.topic-pills-container{padding-bottom:var(--spacing-xs);-webkit-overflow-scrolling:touch;flex-wrap:nowrap;overflow-x:auto}.topic-pills-container:after{content:"";flex:0 0 var(--spacing-sm)}}@media (max-width:480px){html{font-size:14px}.topic-pill{padding:2px 4px;font-size:.65rem}.primary-button,.secondary-button{padding:var(--spacing-xs) var(--spacing-sm);font-size:.7rem}.question-display{min-height:60px;padding:var(--spacing-sm);font-size:.9rem}.answer-input{min-height:50px;font-size:.8rem}.results-display{min-height:50px;font-size:.7rem}}@media (prefers-reduced-motion:reduce){*{transition-duration:.01ms!important;animation-duration:.01ms!important}}.modal{-webkit-backdrop-filter:blur(8px);z-index:1000;background:#00000080;justify-content:center;align-items:center;width:100%;height:100%;display:none;position:fixed;top:0;left:0}.modal.show{display:flex}.modal-content{background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl), var(--shadow-glass);width:90%;max-width:500px;max-height:80dvh;animation:.2s scaleIn;overflow-y:auto}@keyframes scaleIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.modal-header{padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--divider);background:var(--surface-alt);justify-content:space-between;align-items:center;display:flex}.modal-header h2{font-size:1.1rem;font-weight:600}.modal-close{width:28px;height:28px}.modal-body{padding:var(--spacing-lg)}.modal-footer{padding:var(--spacing-md) var(--spacing-lg);border-top:1px solid var(--divider);text-align:right;background:var(--surface-alt)}#settings-tab-basic,#settings-tab-advanced{border-radius:var(--radius-sm) var(--radius-sm) 0 0;color:var(--text-secondary);transition:all var(--transition-fast);background:0 0;border-bottom:2px solid #0000;flex:1}#settings-tab-basic.active,#settings-tab-advanced.active{color:var(--primary);border-bottom-color:var(--primary);background:var(--surface)}.settings-panel{display:block}.settings-section{margin-bottom:var(--spacing-xl)}.settings-section h3{color:var(--primary);margin-bottom:var(--spacing-md);text-transform:uppercase;letter-spacing:.05em;font-size:.9rem;font-weight:600}.setting-item{margin-bottom:var(--spacing-md);justify-content:space-between;align-items:center;display:flex}.setting-item label{color:var(--text-secondary);font-size:.85rem}.setting-item input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary)}.settings-number{-webkit-appearance:textfield;appearance:textfield}.settings-number::-webkit-inner-spin-button{opacity:.5}.settings-number::-webkit-outer-spin-button{opacity:.5}#settings-reset{width:100%}#shortcuts-modal table{border-collapse:collapse;width:100%}#shortcuts-modal td{padding:var(--spacing-xs) var(--spacing-sm);border-bottom:1px solid var(--divider)}#shortcuts-modal td:first-child{color:var(--primary);font-family:monospace}#shortcuts-modal kbd{background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius-sm);padding:2px 6px;font-size:.75rem}#onboarding-overlay .modal-body{text-align:left}#onboarding-overlay .modal-body>div{gap:var(--spacing-md);flex-direction:column;display:flex}#onboarding-overlay .modal-body .step-number{border-radius:var(--radius-full);background:var(--primary);color:#fff;justify-content:center;align-items:center;width:24px;height:24px;font-weight:700;display:inline-flex}.answer-card .math-toolbar{display:none}.answer-card.focused .math-toolbar{display:flex}#pause-session,#skip-question{transition:opacity .2s,transform .2s}#pause-session[style*="display: inline-flex"],#skip-question[style*="display: inline-flex"]{opacity:1;transform:scale(1)}.topic-pill:hover,.primary-button:hover:not(:disabled),.secondary-button:hover:not(:disabled),.icon-button:hover,.math-toolbar-btn:hover,.setting-item select:hover,.setting-item input[type=number]:hover{transition:all var(--transition-normal)}.results-display.correct,.results-display.incorrect{animation-duration:.3s;animation-timing-function:ease-in-out}.math-toolbar{background:var(--surface-alt);border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow-glass);-webkit-overflow-scrolling:touch;flex-wrap:wrap;gap:.75rem;margin-bottom:.5rem;padding:.5rem .75rem;display:flex;position:relative;overflow-x:auto}.math-toolbar-row{flex-wrap:wrap;gap:.75rem;width:100%;display:flex}.math-toolbar-section{border-right:1px solid var(--border-strong);gap:.25rem;margin-right:.5rem;padding-right:.75rem;display:flex}.math-toolbar-section:last-child,.math-toolbar-section.dropdown-trigger{border-right:none;margin-right:0;padding-right:0}.math-toolbar-btn{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);width:28px;height:28px;color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast) cubic-bezier(.2, 0, 0, 1);box-shadow:var(--shadow-sm);justify-content:center;align-items:center;padding:0;font-family:Libertinus Math,Times New Roman,serif;font-size:.8rem;display:inline-flex}.math-toolbar-btn:hover{background:var(--surface-elevated);border-color:var(--primary-light);color:var(--primary);box-shadow:var(--shadow-glass), 0 4px 12px #00000026;transform:translateY(-1px)}.math-toolbar-btn:active{box-shadow:var(--shadow-sm);transform:translateY(0)}.math-toolbar-btn:focus-visible{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light);outline:none}.math-toolbar-btn[data-symbol*=lim],.math-toolbar-btn[data-symbol*=¾gin],.math-toolbar-btn[data-symbol*=mathbb],.math-toolbar-btn[data-symbol*=overrightarrow],.math-toolbar-btn[data-symbol*=\a rcsin],.math-toolbar-btn[data-symbol*=\a rccos],.math-toolbar-btn[data-symbol*=\a rctan],.math-toolbar-btn[data-symbol*=sinh],.math-toolbar-btn[data-symbol*=\c osh],.math-toolbar-btn[data-symbol*=tanh]{width:auto;padding:0 6px;font-size:.7rem}.math-dropdown{background:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl), var(--shadow-glass);z-index:100;max-height:300px;padding:.75rem;display:none;position:absolute;top:calc(100% + 4px);left:0;right:0;overflow-y:auto}.math-dropdown.show{display:block}.math-dropdown-content{flex-direction:column;gap:.75rem;display:flex}.math-dropdown-content .math-toolbar-section{border-right:none;flex-wrap:wrap;margin-right:0;padding-right:0}.math-preview{background:var(--surface-alt);border-radius:var(--radius-sm);border:1px dashed var(--border);min-height:30px;color:var(--text-secondary);transition:border-color var(--transition-fast);margin-top:8px;padding:6px 10px;font-size:.9rem;display:none}.math-preview.has-content{border-style:solid;border-color:var(--primary-light);display:block}.math-preview .katex{font-size:1.1em}.dark .math-toolbar-btn{background:var(--surface);border-color:var(--border)}.dark .math-toolbar-btn:hover{background:var(--surface-elevated);border-color:var(--primary-light);box-shadow:var(--shadow-glass), 0 4px 12px #0000004d}@media (max-width:768px){.math-toolbar{gap:.5rem;padding:.4rem .5rem}.math-toolbar-section{margin-right:.25rem;padding-right:.5rem}.math-toolbar-btn{width:26px;height:26px;font-size:.75rem}.math-toolbar-btn[data-symbol*=lim],.math-toolbar-btn[data-symbol*=¾gin],.math-toolbar-btn[data-symbol*=mathbb],.math-toolbar-btn[data-symbol*=overrightarrow],.math-toolbar-btn[data-symbol*=\a rcsin],.math-toolbar-btn[data-symbol*=\a rccos],.math-toolbar-btn[data-symbol*=\a rctan],.math-toolbar-btn[data-symbol*=sinh],.math-toolbar-btn[data-symbol*=\c osh],.math-toolbar-btn[data-symbol*=tanh]{padding:0 4px;font-size:.65rem}.math-dropdown{max-height:250px}}@media (max-width:480px){.math-toolbar-btn{width:24px;height:24px;font-size:.7rem}.math-toolbar-btn[data-symbol*=lim],.math-toolbar-btn[data-symbol*=¾gin],.math-toolbar-btn[data-symbol*=mathbb],.math-toolbar-btn[data-symbol*=overrightarrow],.math-toolbar-btn[data-symbol*=\a rcsin],.math-toolbar-btn[data-symbol*=\a rccos],.math-toolbar-btn[data-symbol*=\a rctan],.math-toolbar-btn[data-symbol*=sinh],.math-toolbar-btn[data-symbol*=\c osh],.math-toolbar-btn[data-symbol*=tanh]{font-size:.6rem}}.setting-item select{width:160px;padding:var(--spacing-xs) var(--spacing-xl) var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md);border:1px solid var(--border);background:var(--surface);color:var(--text-primary);box-shadow:var(--shadow-sm);-webkit-appearance:none;appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-position:right 8px center;background-repeat:no-repeat;background-size:12px;font-size:.8rem}.setting-item input[type=number]{width:160px;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-md);border:1px solid var(--border);background:var(--surface);color:var(--text-primary);box-shadow:var(--shadow-sm);-webkit-appearance:textfield;appearance:textfield;transition:all var(--transition-fast);font-size:.8rem}.setting-item input[type=number]:hover{background:var(--surface-elevated);box-shadow:var(--shadow-glass);border-color:#ffffff4d}.setting-item input[type=number]:focus{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-light);outline:none}.setting-item input[type=number]::-webkit-inner-spin-button{opacity:.5;margin:0}.setting-item input[type=number]::-webkit-outer-spin-button{opacity:.5;margin:0}.setting-item input[type=number]:hover::-webkit-inner-spin-button{opacity:1}.setting-item input[type=number]:hover::-webkit-outer-spin-button{opacity:1}.statistics-panel{align-items:center;gap:var(--spacing-md);margin-top:var(--spacing-sm);display:flex}.choices-container{gap:var(--spacing-sm);margin-top:var(--spacing-sm);flex-wrap:wrap;justify-content:center;width:100%;display:flex}.choice-button{min-width:80px;padding:var(--spacing-sm) var(--spacing-md);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm);flex:auto;font-size:.9rem}.choice-button:hover{background:var(--surface-elevated);border-color:var(--primary);box-shadow:var(--shadow-glass);transform:translateY(-2px)}.choice-button:active{transform:translateY(0)}.statistics-panel{align-items:center;gap:var(--spacing-md);margin-left:auto;display:flex}.statistics-panel .stat-with-icon{background:var(--surface-alt);border-radius:var(--radius-full);padding:2px 8px;font-size:.75rem}@media (max-width:768px){.choice-button{min-width:60px;padding:var(--spacing-xs) var(--spacing-sm);font-size:.8rem}.statistics-panel{justify-content:space-between;width:100%;margin-left:0}}#link-to-main-site{color:var(--text-secondary)}