:root{--color-primary:#667eea;--color-primary-dark:#5a67d8;--color-primary-light:#e8eaf6;--color-secondary:#764ba2;--color-gradient:linear-gradient(135deg,#667eea,#764ba2);--color-success:#4caf50;--color-success-dark:#2e7d2e;--color-success-bg:#e8f5e8;--color-warning:#ff9800;--color-warning-dark:#856404;--color-warning-bg:#fff3cd;--color-error:#ff5722;--color-error-dark:#721c24;--color-error-bg:#f8d7da;--color-error-border:#f5c6cb;--color-info:#2196f3;--color-info-dark:#1565c0;--color-info-bg:#e3f2fd;--color-info-light:#f0f4ff;--color-white:#fff;--color-bg-light:#f9f9f9;--color-bg-hover:#f5f5f5;--color-bg-blue-light:#f0f7ff;--color-bg-card:#f8f9fa;--color-border:#ddd;--color-border-light:#e0e0e0;--color-border-lightest:#f0f0f0;--color-text-primary:#333;--color-text-secondary:#555;--color-text-tertiary:#767676;--color-text-on-light-bg:#595959;--color-text-muted:#666;--color-text-link:#4c5fd5;--font-size-xs:0.75rem;--font-size-sm:0.85rem;--font-size-base:0.95rem;--font-size-md:1rem;--font-size-lg:1.1rem;--font-size-xl:1.35rem;--font-size-2xl:1.5rem;--font-size-3xl:2rem;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:0.75rem;--spacing-base:1rem;--spacing-lg:1.25rem;--spacing-xl:1.5rem;--spacing-2xl:2rem;--spacing-3xl:2.5rem;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--radius-xl:12px;--radius-2xl:16px;--radius-full:50px;--shadow-sm:0 2px 4px #0000000d;--shadow-md:0 4px 12px #0000001a;--shadow-lg:0 4px 20px #0000001a;--shadow-xl:0 10px 30px #0000001a;--shadow-2xl:0 20px 60px #0000004d;--shadow-primary:0 4px 12px #667eea66;--shadow-header:0 2px 10px #0000001a;--transition-fast:0.2s ease;--transition-base:0.3s ease;--z-back-arrow:10;--z-offline:900;--z-pwa-install:950;--z-pwa-update:1000;--z-beta-banner:1001;--touch-target-min:44px;--touch-target-mobile:48px}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}}body{margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}:focus-visible{outline:2px solid #667eea;outline:2px solid var(--color-primary);outline-offset:2px}*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--color-gradient);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif}.App,body{min-height:100vh}.App{display:flex;flex-direction:column}.App-header{background-color:#fffffff2;box-shadow:var(--shadow-header);padding:var(--spacing-lg) var(--spacing-xl);text-align:center}.App-header h1{color:var(--color-text-primary);font-size:var(--font-size-2xl);margin-bottom:.35rem}.App-header p{color:#444;font-size:.9rem;font-weight:500}.App-header .subtitle{color:var(--color-text-tertiary);display:block;font-size:.8rem;font-weight:400;margin-top:.35rem}.App-main{align-items:center;display:flex;flex:1 1;flex-direction:column}.App-main,.progress-bar{padding:var(--spacing-base)}.progress-bar{background:var(--color-white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);margin-bottom:var(--spacing-lg);max-width:550px;width:100%}.progress-steps{justify-content:space-between;margin-bottom:var(--spacing-base)}.progress-steps,.step{display:flex;position:relative}.step{align-items:center;flex:1 1;flex-direction:column}.step-number{align-items:center;background:var(--color-border-light);border-radius:50%;color:var(--color-text-on-light-bg);display:flex;font-size:.9rem;font-weight:700;height:35px;justify-content:center;margin-bottom:.4rem;transition:all var(--transition-base);width:35px}.step.active .step-number{background:var(--color-primary);color:var(--color-white)}.step-label{color:var(--color-text-secondary);font-size:.9rem}@media (max-width:768px){.step-label{font-size:.9rem}}.progress-fill{background:var(--color-primary);border-radius:2px;height:4px;transition:width var(--transition-base)}.form-container{background:var(--color-white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);max-width:550px;padding:var(--spacing-lg);width:100%}.step-container h2{color:var(--color-text-primary);font-size:var(--font-size-xl);margin-bottom:.9rem}.form-group{margin-bottom:1.15rem}.form-group label{color:var(--color-text-secondary);display:block;font-size:var(--font-size-base);font-weight:500;margin-bottom:.4rem}.slider{-webkit-appearance:none;background:var(--color-border-light);border-radius:3px;height:5px;margin:var(--spacing-md) 0;transition:opacity var(--transition-fast);width:100%}.slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;background:var(--color-primary);border-radius:50%;cursor:pointer;height:28px;width:28px}.slider::-moz-range-thumb{background:var(--color-primary);border-radius:50%;cursor:pointer;height:28px;width:28px}.slider-labels{color:var(--color-text-tertiary)}.bmi-categories,.slider-labels{display:flex;font-size:var(--font-size-sm);justify-content:space-between}.bmi-categories{margin-top:var(--spacing-sm)}.bmi-categories span{background:var(--color-bg-hover);border-radius:var(--radius-sm);color:var(--color-text-tertiary);padding:var(--spacing-xs) var(--spacing-sm);transition:all var(--transition-base)}.bmi-categories span.active{background:var(--color-primary);color:var(--color-white)}.select-input{background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;font-size:var(--font-size-base);min-height:var(--touch-target-min);padding:.6rem;width:100%}.checkbox-group{background:var(--color-bg-light);border-radius:var(--radius-lg);margin-bottom:var(--spacing-base);padding:var(--spacing-base)}.checkbox-label{align-items:center;cursor:pointer;display:flex}.checkbox-label input[type=checkbox]{cursor:pointer;height:20px;margin-right:var(--spacing-md);width:20px}.checkbox-label span{color:var(--color-text-primary);font-weight:500}.help-text{color:var(--color-text-secondary);font-size:var(--font-size-sm);margin-left:2rem;margin-top:var(--spacing-sm)}.activity-descriptions{margin-top:var(--spacing-base)}.activity-descriptions div{background:var(--color-bg-hover);border-radius:var(--radius-sm);margin-bottom:var(--spacing-sm);padding:var(--spacing-sm);transition:all var(--transition-base)}.activity-descriptions div.active{background:var(--color-primary-light);border-left:3px solid var(--color-primary)}.activity-descriptions strong{color:var(--color-text-primary)}.info-box{background:var(--color-info-light);border-left:4px solid var(--color-primary);border-radius:var(--radius-sm);margin-bottom:.9rem;padding:.65rem}.info-box h3{color:var(--color-text-primary);font-size:1.05rem;margin-bottom:.4rem}.info-box p{color:var(--color-text-muted);font-size:.9rem;margin-bottom:.4rem}.button-group{display:flex;gap:var(--spacing-base);justify-content:space-between}.btn{-webkit-tap-highlight-color:transparent;border:none;border-radius:var(--radius-sm);cursor:pointer;font-size:var(--font-size-base);font-weight:500;min-height:var(--touch-target-min);padding:.65rem 1.75rem;touch-action:manipulation;transition:all var(--transition-base)}.btn-primary{background:var(--color-primary);color:var(--color-white)}.btn-primary:hover{background:var(--color-primary-dark);box-shadow:var(--shadow-primary);transform:translateY(-2px)}.btn-secondary{background:var(--color-border-light);color:var(--color-text-primary)}.btn-secondary:hover{background:#d0d0d0}.btn-lifestyle-advice{background:var(--color-info);color:var(--color-white)}.btn-lifestyle-advice:hover{background:#1976d2;box-shadow:0 4px 12px #2196f366;transform:translateY(-2px)}.btn-large{font-size:var(--font-size-md);padding:.85rem 2.5rem}.btn:disabled{cursor:not-allowed;opacity:.5}.btn:disabled,.btn:disabled:hover{box-shadow:none;transform:none}.results-container{background:var(--color-white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);margin:0 auto;max-width:550px;padding:var(--spacing-lg);text-align:center;width:100%}.results-container h2{color:var(--color-text-primary);font-size:1.4rem}.results-container h2,.risk-score-display{margin-bottom:var(--spacing-xl)}.percentage-circle{align-items:center;background:var(--color-white);border:6px solid var(--color-primary);border-radius:50%;box-shadow:var(--shadow-lg);display:flex;flex-direction:column;height:140px;justify-content:center;margin:0 auto .85rem;width:140px}.percentage-number{color:var(--color-text-primary);font-size:var(--font-size-3xl);font-weight:700;line-height:1}.percentage-label{color:var(--color-text-muted);font-size:.8rem}.risk-category{font-size:var(--font-size-2xl);font-weight:700;margin-bottom:.4rem}.risk-description{color:var(--color-text-muted);font-size:var(--font-size-md)}.risk-description,.risk-meter{margin-bottom:var(--spacing-xl)}.meter-bar{background:var(--color-border-light);border-radius:var(--radius-xl);height:24px;margin-bottom:.4rem;overflow:hidden;position:relative;width:100%}.meter-fill{height:100%;transition:width 1s ease}.meter-labels{color:var(--color-text-muted);display:flex;font-size:var(--font-size-sm);justify-content:space-between}.risk-interpretation{background:var(--color-bg-light);border-radius:var(--radius-lg);margin-bottom:var(--spacing-xl);padding:var(--spacing-xl);text-align:left}.risk-interpretation h3{color:var(--color-text-primary);font-size:var(--font-size-lg);margin-bottom:var(--spacing-md)}.risk-interpretation p{color:var(--color-text-secondary);font-size:var(--font-size-base);line-height:1.6}.recommendations-section{background:var(--color-bg-light);border-radius:var(--radius-lg);margin-bottom:var(--spacing-xl);padding:var(--spacing-xl);text-align:left}.recommendations-section h3{color:var(--color-text-primary);margin-bottom:var(--spacing-base)}.recommendations-list{list-style:none}.recommendations-list li{background:var(--color-white);border-left:3px solid var(--color-primary);border-radius:var(--radius-sm);color:var(--color-text-secondary);margin-bottom:var(--spacing-sm);padding:var(--spacing-md)}.guidelines-section{background:var(--color-bg-light);border-radius:var(--radius-lg);margin-bottom:var(--spacing-xl);padding:var(--spacing-xl);text-align:left}.guidelines-disclaimer{background:var(--color-info-bg);border-left:4px solid var(--color-info);border-radius:var(--radius-sm);color:var(--color-info-dark);font-size:.9rem;padding:var(--spacing-base)}.guidelines-disclaimer,.risk-ranges{margin-bottom:var(--spacing-xl)}.risk-range-item{align-items:center;background:var(--color-white);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);display:flex;margin-bottom:var(--spacing-md);padding:var(--spacing-md)}.risk-range-indicator{border-radius:var(--radius-md);flex-shrink:0;height:40px;margin-right:var(--spacing-base);width:40px}.risk-range-content{color:var(--color-text-primary);font-size:var(--font-size-base)}.current-category{background:var(--color-white);border-left:4px solid;border-radius:var(--radius-sm);font-size:var(--font-size-lg);font-weight:500;padding:var(--spacing-base)}.high-risk-notice{background:var(--color-error-bg);border:1px solid var(--color-error-border);border-radius:var(--radius-lg);color:var(--color-error-dark);font-size:var(--font-size-sm);margin-bottom:1.15rem;padding:var(--spacing-lg);text-align:left}.high-risk-notice h4{color:#491217;font-size:var(--font-size-md);margin-bottom:var(--spacing-sm)}.high-risk-notice strong{color:#491217}.high-risk-notice .btn-primary{display:inline-block;font-size:var(--font-size-sm);margin-top:var(--spacing-md);padding:.5rem 1.25rem}.disclaimer{background:var(--color-warning-bg);border:1px solid #ffc107;border-radius:var(--radius-sm);color:var(--color-warning-dark);font-size:var(--font-size-sm);margin-bottom:1.15rem;padding:.85rem;text-align:left}.disclaimer strong{color:#664100}.research-citation{background:var(--color-info-light);border-radius:var(--radius-lg);color:var(--color-text-secondary);font-size:var(--font-size-sm);margin-bottom:var(--spacing-lg);padding:var(--spacing-base);text-align:left}.research-citation cite{color:var(--color-primary);display:block;font-style:italic;margin-top:var(--spacing-sm)}.results-container .btn{display:block;margin:0 auto;max-width:400px;width:100%}.results-action-card{background:var(--color-white);border-radius:var(--radius-lg);box-shadow:0 2px 8px #0000001a;display:flex;flex-direction:column;gap:var(--spacing-base);margin:var(--spacing-base) auto 0 auto;max-width:550px;padding:var(--spacing-lg);text-align:center;width:100%}.results-action-card .btn{margin:0 auto;max-width:400px;width:100%}.age-risk-info{margin-top:var(--spacing-sm)}.risk-indicator{border-radius:var(--radius-xl);display:inline-block;font-size:var(--font-size-sm);font-weight:500;padding:var(--spacing-xs) var(--spacing-md)}.risk-indicator.low{background:var(--color-success-bg);color:var(--color-success-dark)}.risk-indicator.moderate{background:var(--color-warning-bg);color:var(--color-warning-dark)}.risk-indicator.moderate-high{background:var(--color-error-bg);color:var(--color-error-dark)}.risk-indicator.high{background:var(--color-error-border);color:var(--color-error-dark)}.risk-indicator.very-high{background:#f1b0b7;color:var(--color-error-dark)}.clinical-significance{background:var(--color-bg-card);border-left:4px solid var(--color-primary);border-radius:var(--radius-sm);margin-bottom:var(--spacing-xl);padding:var(--spacing-xl);text-align:left}.clinical-significance h3{color:var(--color-text-primary);margin-bottom:var(--spacing-base)}.clinical-significance p{color:var(--color-text-secondary);line-height:1.6}.source-info{background:var(--color-info-light);border-radius:var(--radius-lg);margin-bottom:var(--spacing-xl);padding:var(--spacing-xl);text-align:left}.source-info h3{color:var(--color-text-primary);margin-bottom:var(--spacing-base)}.source-info p{color:var(--color-text-secondary);line-height:1.6;margin-bottom:var(--spacing-sm)}.source-info cite{color:var(--color-primary);display:block;font-style:italic;margin:var(--spacing-base) 0}.ethnicity-help-text{color:var(--color-text-secondary);font-size:var(--font-size-sm);font-style:italic;margin-top:var(--spacing-sm)}.bmi-calculator-link{-webkit-tap-highlight-color:transparent;align-items:center;background:var(--color-gradient);border:none;border-radius:5px;color:var(--color-white);cursor:pointer;display:inline-flex;font-size:var(--font-size-sm);font-weight:500;margin-left:10px;min-height:var(--touch-target-min);padding:8px 16px;touch-action:manipulation}.footer-button-container{display:flex;flex-wrap:wrap;gap:var(--spacing-base);padding:0 var(--spacing-2xl) var(--spacing-2xl) var(--spacing-2xl)}.footer-button-container .btn{flex:1 1;min-width:200px}.confirm-dialog-overlay{align-items:center;background:#00000080;bottom:0;display:flex;justify-content:center;left:0;padding:var(--spacing-base);position:fixed;right:0;top:0;z-index:2000}.confirm-dialog{background:var(--color-white);border-radius:var(--radius-2xl);box-shadow:var(--shadow-2xl);max-width:400px;padding:var(--spacing-2xl);text-align:center;width:100%}.confirm-dialog h3{color:var(--color-text-primary);font-size:var(--font-size-xl);margin-bottom:var(--spacing-md)}.confirm-dialog p{color:var(--color-text-secondary);line-height:1.5;margin-bottom:var(--spacing-xl)}.confirm-dialog .button-group{justify-content:center}.error-boundary-container{align-items:center;background:var(--color-gradient);display:flex;flex-direction:column;justify-content:center;min-height:100vh;padding:var(--spacing-2xl);text-align:center}.error-boundary-card{background:var(--color-white);border-radius:10px;box-shadow:var(--shadow-lg);max-width:500px;padding:var(--spacing-2xl)}.error-boundary-card h1{color:var(--color-error);margin-bottom:var(--spacing-base)}.error-boundary-card p{color:var(--color-text-muted);margin-bottom:var(--spacing-xl)}.error-boundary-card details{margin-bottom:var(--spacing-xl);text-align:left}.error-boundary-card summary{color:var(--color-primary);cursor:pointer}.error-boundary-card pre{background:var(--color-bg-hover);border-radius:var(--radius-sm);font-size:var(--font-size-sm);margin-top:var(--spacing-base);overflow:auto;padding:var(--spacing-base)}button,input,select{-webkit-tap-highlight-color:transparent;touch-action:manipulation}input[type=checkbox],input[type=radio]{min-height:24px;min-width:24px}body{-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain}@media (max-width:768px){.App-header h1{font-size:var(--font-size-2xl)}.form-container{padding:var(--spacing-lg)}.button-group{flex-direction:column;gap:var(--spacing-md)}.results-action-card .btn{max-width:none}.btn{font-size:var(--font-size-md);min-height:var(--touch-target-mobile);padding:.85rem 1.75rem;width:100%}.step-number{font-size:.8rem;height:28px;width:28px}.step-label{font-size:.75rem}.slider::-webkit-slider-thumb{height:36px;width:36px}.slider::-moz-range-thumb{height:36px;width:36px}.form-group{margin-bottom:var(--spacing-xl)}.select-input{font-size:var(--font-size-md);min-height:var(--touch-target-mobile)}.footer-button-container{padding:0 var(--spacing-xl) var(--spacing-xl) var(--spacing-xl)}}.table-scroll-wrapper{-webkit-overflow-scrolling:touch;margin:1.5rem 0;overflow-x:auto}.table-scroll-wrapper .weight-gain-table{margin:0}.splash-container{align-items:center;background:var(--color-gradient);display:flex;justify-content:center;min-height:100vh;padding:20px}.splash-content{background:var(--color-white);border-radius:var(--radius-2xl);box-shadow:var(--shadow-2xl);max-width:550px;padding:30px;text-align:center}.splash-image{border-radius:var(--radius-xl);box-shadow:0 10px 30px #0000001a;height:auto;margin-bottom:22px;max-width:350px;width:100%}.splash-title{color:#000;font-size:2rem;font-weight:700;margin-bottom:8px}.splash-subtitle{color:#000;font-size:1.05rem;font-weight:500;margin-bottom:16px}.splash-description{color:#000;font-size:var(--font-size-base);line-height:1.6;margin-bottom:24px}.splash-start-button{-webkit-tap-highlight-color:transparent;background:var(--color-gradient);border:none;border-radius:50px;color:var(--color-white);cursor:pointer;font-size:var(--font-size-md);font-weight:600;margin-bottom:16px;min-height:var(--touch-target-min);padding:12px 35px;touch-action:manipulation;transition:transform .2s,box-shadow .2s}.splash-start-button:hover{box-shadow:0 10px 30px #667eea66;transform:translateY(-2px)}.splash-note{color:#000;font-size:var(--font-size-sm);margin:0 0 12px}.splash-credits-button{-webkit-tap-highlight-color:transparent;background:#0000;border:2px solid var(--color-text-link);border-radius:50px;color:var(--color-text-link);cursor:pointer;font-size:var(--font-size-base);font-weight:600;min-height:var(--touch-target-min);padding:10px 26px;touch-action:manipulation;transition:background .2s,color .2s}.splash-credits-button:hover{background:var(--color-text-link);color:var(--color-white)}.splash-footer{border-top:1px solid var(--color-border-light);margin-top:24px;padding-top:16px}.splash-footer p{color:#000;font-size:var(--font-size-sm);margin:0}.splash-footer a{color:var(--color-text-link);text-decoration:none;transition:color .2s}.splash-footer a:hover{color:#5a3a7a;text-decoration:underline}.splash-copyright{color:#000;font-size:.75rem;margin-top:8px}@media (max-width:600px){.splash-content{padding:30px 20px}.splash-title{font-size:2rem}.splash-subtitle{font-size:var(--font-size-md)}.splash-description{font-size:.9rem}}.bmi-calculator-container{align-items:center;background:var(--color-gradient);display:flex;justify-content:center;min-height:100vh;padding:20px}.bmi-calculator-card{background:var(--color-white);border-radius:var(--radius-2xl);box-shadow:var(--shadow-2xl);max-width:480px;padding:30px;width:100%}.bmi-calculator-card h2{color:var(--color-text-primary);font-size:1.65rem;margin-bottom:8px;text-align:center}.bmi-description{color:var(--color-text-muted);font-size:var(--font-size-base);margin-bottom:24px;text-align:center}.unit-toggle{display:flex;gap:8px;justify-content:center;margin-bottom:24px}.unit-button{-webkit-tap-highlight-color:transparent;background:var(--color-white);border:2px solid var(--color-border);border-radius:var(--radius-lg);color:var(--color-text-muted);cursor:pointer;flex:1 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