Update settings add min<=max validation to ranges, minor text changes

src/components/settings.tsx

@@ -134,6 +134,10 @@ const Settings = ({
   // Track which tooltip is currently open (for mobile touch interaction)
   const [openTooltipId, setOpenTooltipId] = React.useState<string | null>(null);
 
+  // Validation state for range inputs
+  const [therapeuticRangeError, setTherapeuticRangeError] = React.useState<string>('');
+  const [yAxisRangeError, setYAxisRangeError] = React.useState<string>('');
+
   // Track window width for responsive tooltip positioning
   const [isNarrowScreen, setIsNarrowScreen] = React.useState(
     typeof window !== 'undefined' ? window.innerWidth < 640 : false
@@ -226,6 +230,27 @@ const Settings = ({
   // Create defaults object for translation interpolation
   const defaultsForT = getDefaultsForTranslation(pkParams, therapeuticRange, uiSettings);
 
+  // Validate range inputs
+  React.useEffect(() => {
+    // Therapeutic range validation (blocking error)
+    const minTherapeutic = parseFloat(therapeuticRange.min);
+    const maxTherapeutic = parseFloat(therapeuticRange.max);
+    if (!isNaN(minTherapeutic) && !isNaN(maxTherapeutic) && minTherapeutic >= maxTherapeutic) {
+      setTherapeuticRangeError(t('errorTherapeuticRangeInvalid'));
+    } else {
+      setTherapeuticRangeError('');
+    }
+
+    // Y-axis range validation (non-blocking warning)
+    const minYAxis = parseFloat(yAxisMin);
+    const maxYAxis = parseFloat(yAxisMax);
+    if (!isNaN(minYAxis) && !isNaN(maxYAxis) && minYAxis >= maxYAxis) {
+      setYAxisRangeError(t('errorYAxisRangeInvalid'));
+    } else {
+      setYAxisRangeError('');
+    }
+  }, [therapeuticRange.min, therapeuticRange.max, yAxisMin, yAxisMax, t]);
+
   // Helper to update nested advanced settings
   const updateAdvanced = (category: string, key: string, value: any) => {
     onUpdatePkParams('advanced', {
@@ -380,7 +405,8 @@ const Settings = ({
                       min={0}
                       placeholder={t('min')}
                       required={true}
-                      errorMessage={t('errorTherapeuticRangeMinRequired') || 'Minimum therapeutic range is required'}
+                      error={!!therapeuticRangeError || !therapeuticRange.min}
+                      errorMessage={therapeuticRangeError || t('errorTherapeuticRangeMinRequired') || 'Minimum therapeutic range is required'}
                     />
                     <span className="text-muted-foreground">-</span>
                     <FormNumericInput
@@ -391,7 +417,8 @@ const Settings = ({
                       placeholder={t('max')}
                       unit="ng/ml"
                       required={true}
-                      errorMessage={t('errorTherapeuticRangeMaxRequired') || 'Maximum therapeutic range is required'}
+                      error={!!therapeuticRangeError || !therapeuticRange.max}
+                      errorMessage={therapeuticRangeError || t('errorTherapeuticRangeMaxRequired') || 'Maximum therapeutic range is required'}
                     />
                   </div>
                 </div>
@@ -461,6 +488,8 @@ const Settings = ({
                   placeholder={t('auto')}
                   allowEmpty={true}
                   clearButton={true}
+                  warning={!!yAxisRangeError}
+                  warningMessage={yAxisRangeError}
                 />
                 <span className="text-muted-foreground">-</span>
                 <FormNumericInput
@@ -472,6 +501,8 @@ const Settings = ({
                   unit="ng/ml"
                   allowEmpty={true}
                   clearButton={true}
+                  warning={!!yAxisRangeError}
+                  warningMessage={yAxisRangeError}
                 />
               </div>
             </div>

src/constants/defaults.ts

@@ -159,7 +159,7 @@ export const getDefaultState = (): AppState => ({
     }
   ],
   steadyStateConfig: { daysOnMedication: '7' }, // kept for backwards compatibility, now sourced from pkParams.advanced
-  therapeuticRange: { min: '', max: '' }, // Empty by default - users should personalize based on their response
+  therapeuticRange: { min: '10', max: '120' }, // min for adults and max for children for maximum range (users should personalize based on their response)
   doseIncrement: '2.5',
   uiSettings: {
     showDayTimeOnXAxis: '24h',
@@ -168,7 +168,7 @@ export const getDefaultState = (): AppState => ({
     yAxisMin: '',
     yAxisMax: '',
     simulationDays: '5',
-    displayedDays: '2',
+    displayedDays: '1',
     showTherapeuticRange: false,
     steadyStateDaysEnabled: true,
     stickyChart: false,

src/locales/de.ts

@@ -108,7 +108,7 @@ export const de = {
   yAxisRangeAutoButton: "A",
   yAxisRangeAutoButtonTitle: "Bereich automatisch anhand des Datenbereichs bestimmen",
   auto: "Auto",
-  therapeuticRange: "Therapeutischer Bereich",
+  therapeuticRange: "Therapeutischer Bereich (d-Amphetamin)",
   therapeuticRangeTooltip: "Personalisierte Konzentrationsziele basierend auf DEINER individuellen Reaktion. Setze diese nachdem du beobachtet hast, welche Werte Symptomkontrolle vs. Nebenwirkungen bieten. Referenzbereiche (stark variabel): Erwachsene ~10-80 ng/mL, Kinder ~20-120 ng/mL (aufgrund geringeren Körpergewichts/Vd). Leer lassen wenn unsicher. Konsultiere deinen Arzt.",
   dAmphetamineParameters: "d-Amphetamin Parameter",
   halfLife: "Eliminations-Halbwertszeit",
@@ -269,6 +269,8 @@ export const de = {
   errorConversionHalfLifeRequired: "⛔ Umwandlungs-Halbwertszeit ist erforderlich.",
   errorTherapeuticRangeMinRequired: "⛔ Minimaler therapeutischer Bereich ist erforderlich.",
   errorTherapeuticRangeMaxRequired: "⛔ Maximaler therapeutischer Bereich ist erforderlich.",
+  errorTherapeuticRangeInvalid: "⛔ Maximum muss größer als Minimum sein.",
+  errorYAxisRangeInvalid: "⚠️ Maximum muss größer als Minimum sein.",
   errorEliminationHalfLifeRequired: "⛔ Eliminations-Halbwertszeit ist erforderlich.",
 
   // Field validation - Warnings

src/locales/en.ts

@@ -106,7 +106,7 @@ export const en = {
   yAxisRangeAutoButton: "A",
   yAxisRangeAutoButtonTitle: "Determine range automatically based on data range",
   auto: "Auto",
-  therapeuticRange: "Therapeutic Range",
+  therapeuticRange: "Therapeutic Range (d-Amphetamine)",
   therapeuticRangeTooltip: "Personalized concentration targets based on YOUR individual response. Set these after observing which levels provide symptom control vs. side effects. Reference ranges (highly variable): Adults ~10-80 ng/mL, Children ~20-120 ng/mL (due to lower body weight/Vd). Leave empty if unsure. Consult your physician.",
   dAmphetamineParameters: "d-Amphetamine Parameters",
   halfLife: "Elimination Half-life",
@@ -268,6 +268,8 @@ export const en = {
   errorAbsorptionRateRequired: "⛔ Absorption rate is required.",
   errorTherapeuticRangeMinRequired: "⛔ Minimum therapeutic range is required.",
   errorTherapeuticRangeMaxRequired: "⛔ Maximum therapeutic range is required.",
+  errorTherapeuticRangeInvalid: "⛔ Maximum must be greater than minimum.",
+  errorYAxisRangeInvalid: "⚠️ Maximum must be greater than minimum.",
   errorEliminationHalfLifeRequired: "⛔ Elimination half-life is required.",