small fixes

components/explorers/standard-form-explorer.tsx

@@ -337,10 +337,11 @@ export function StandardFormExplorer() {
             <p className="text-sm text-muted">
               {totalSteps === 0
                 ? "Number is already in standard form position — power = 0"
-                : `Step ${currentStep} of ${totalSteps}`}
+                : `Step ${currentStep + 1} of ${totalSteps}`}
             </p>
 
             {/* Digit row */}
+            <div className="overflow-x-auto max-sm:pb-2">
             <div ref={numberRowRef} className="relative inline-flex items-end gap-2.5 px-4 pb-7 pt-2">
               {display.digits.map((ch, i) => {
                 const isLeadingZero = i < fz && fz !== -1;
@@ -372,6 +373,7 @@ export function StandardFormExplorer() {
                 }}
               />
             </div>
+            </div>
 
             {/* Direction label */}
             {dirText && (
@@ -403,7 +405,7 @@ export function StandardFormExplorer() {
       {/* Controls */}
       <Card className="p-4">
         <StepControls
-          currentStep={currentStep}
+          currentStep={currentStep + 1}
           totalSteps={totalSteps}
           isPlaying={isPlaying}
           onStepForward={stepForward}