---
phase: 01-input-ux
plan: 01
type: execute
wave: 1
depends_on: []
files_modified:
  - frontend/src/components/StepperInput.jsx
  - frontend/src/components/WeightInput.jsx
  - frontend/src/components/RepsInput.jsx
  - frontend/src/App.css
autonomous: true

must_haves:
  truths:
    - "StepperInput renders a numeric input flanked by - and + buttons"
    - "Tapping - or + changes the value by the configured step amount"
    - "Typing a negative number is rejected; the value is clamped to min (0 by default)"
    - "The - button is visually disabled when value equals min"
    - "WeightInput passes step=2.5, suffix=kg to StepperInput"
    - "RepsInput passes step=1, no suffix to StepperInput"
  artifacts:
    - path: "frontend/src/components/StepperInput.jsx"
      provides: "Reusable controlled stepper input component"
      exports: ["default StepperInput"]
    - path: "frontend/src/components/WeightInput.jsx"
      provides: "Weight-specific wrapper (2.5kg steps, kg suffix)"
      exports: ["default WeightInput"]
    - path: "frontend/src/components/RepsInput.jsx"
      provides: "Reps-specific wrapper (1 rep steps)"
      exports: ["default RepsInput"]
    - path: "frontend/src/App.css"
      provides: "Stepper component styles"
      contains: ".stepper-wrapper"
  key_links:
    - from: "frontend/src/components/WeightInput.jsx"
      to: "frontend/src/components/StepperInput.jsx"
      via: "import StepperInput"
      pattern: "import StepperInput"
    - from: "frontend/src/components/RepsInput.jsx"
      to: "frontend/src/components/StepperInput.jsx"
      via: "import StepperInput"
      pattern: "import StepperInput"
---

<objective>
Create three new React components: StepperInput (reusable base), WeightInput (2.5kg steps + kg suffix), and RepsInput (1 rep steps). Add CSS styles to App.css.

Purpose: These components are the foundation that Plan 02 will drop into WorkoutPage to replace the bare inputs. They must be complete and self-contained before integration happens.
Output: Three .jsx files in frontend/src/components/, new CSS block in App.css.
</objective>

<execution_context>
@/home/intense/.claude/get-shit-done/workflows/execute-plan.md
@/home/intense/.claude/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/PROJECT.md
@.planning/ROADMAP.md
@.planning/STATE.md
@.planning/phases/01-input-ux/01-RESEARCH.md
@frontend/src/index.css
@frontend/src/App.css
</context>

<tasks>

<task type="auto">
  <name>Task 1: Create StepperInput.jsx</name>
  <files>frontend/src/components/StepperInput.jsx</files>
  <action>
Create a new controlled React component at frontend/src/components/StepperInput.jsx.

Props:
- value (string, default '')
- onChange (function, receives string)
- step (number, default 1)
- min (number, default 0)
- max (number or null, default null)
- label (string, default 'Value')
- suffix (string, default '')
- disabled (boolean, default false)

Behavior:
- handleInputChange: parse e.target.value as float. If empty string, call onChange(''). If parsed >= min (and <= max if set), call onChange(String(parsed)). If parsed < min, call onChange(String(min)). Reject non-numeric input silently.
- handleDecrement: newVal = Math.max(min, numValue - step). Call onChange(String(newVal)). No-op if disabled.
- handleIncrement: newVal = numValue + step. If max is null or newVal <= max, call onChange(String(newVal)). No-op if disabled.
- canDecrement = numValue > min
- canIncrement = max === null || numValue < max

JSX structure:
```
<div className="stepper-wrapper" role="group" aria-labelledby={`stepper-label-${label}`}>
  <label id={`stepper-label-${label}`} className="stepper-label">{label}</label>
  <div className="stepper-container">
    <button type="button" className="stepper-btn stepper-minus" onClick={handleDecrement}
      disabled={!canDecrement || disabled} aria-label={`Decrease ${label}`}>−</button>
    <div className="stepper-input-wrapper">
      <input type="number" value={value} onChange={handleInputChange}
        min={min} max={max ?? undefined} step={step}
        inputMode={step % 1 === 0 ? 'numeric' : 'decimal'}
        className="stepper-input" aria-label={label} disabled={disabled} />
      {suffix && <span className="input-suffix">{suffix}</span>}
    </div>
    <button type="button" className="stepper-btn stepper-plus" onClick={handleIncrement}
      disabled={!canIncrement || disabled} aria-label={`Increase ${label}`}>+</button>
  </div>
</div>
```

Export default StepperInput.

Note: Do NOT use useState or useEffect inside this component — it is a pure controlled component. All state lives in the parent.
  </action>
  <verify>File exists at frontend/src/components/StepperInput.jsx with exported default function. Check: grep -n "export default" frontend/src/components/StepperInput.jsx</verify>
  <done>StepperInput.jsx exists, exports default, contains handleDecrement, handleIncrement, handleInputChange logic with min clamping.</done>
</task>

<task type="auto">
  <name>Task 2: Create WeightInput.jsx and RepsInput.jsx, add stepper CSS to App.css</name>
  <files>
    frontend/src/components/WeightInput.jsx
    frontend/src/components/RepsInput.jsx
    frontend/src/App.css
  </files>
  <action>
Create frontend/src/components/WeightInput.jsx:
- Imports StepperInput from './StepperInput'
- Renders: &lt;StepperInput value={value} onChange={onChange} step={2.5} min={0} max={null} label="Weight" suffix="kg" disabled={disabled} /&gt;
- Props: value, onChange, disabled (default false)
- Export default WeightInput

Create frontend/src/components/RepsInput.jsx:
- Imports StepperInput from './StepperInput'
- Renders: &lt;StepperInput value={value} onChange={onChange} step={1} min={0} max={null} label="Reps" suffix="" disabled={disabled} /&gt;
- Props: value, onChange, disabled (default false)
- Export default RepsInput

Append to frontend/src/App.css a new section after the last line:

```css
/* ============================================
   STEPPER INPUT COMPONENT
   ============================================ */

.stepper-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  width: 100%;
}

.stepper-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stepper-container {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-card);
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 0.2rem;
  height: 48px;
}

.stepper-btn {
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  background: var(--bg-secondary);
  border: none;
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 1.4rem;
  font-weight: 300;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
  line-height: 1;
}

.stepper-btn:hover:not(:disabled) {
  background: var(--accent);
  color: white;
}

.stepper-btn:active:not(:disabled) {
  transform: scale(0.94);
}

.stepper-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.stepper-input-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  min-width: 0;
}

.stepper-input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 16px; /* >= 16px prevents iOS auto-zoom */
  font-weight: 600;
  text-align: center;
  padding: 0.4rem 0.25rem;
  outline: none;
  font-family: inherit;
}

.stepper-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Remove browser native number spinners */
.stepper-input::-webkit-outer-spin-button,
.stepper-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.stepper-input[type='number'] {
  -moz-appearance: textfield;
}

.input-suffix {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

/* Mobile: slightly larger touch targets */
@media (max-width: 480px) {
  .stepper-container {
    height: 52px;
  }

  .stepper-btn {
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
  }
}
```

Important: Do NOT delete any existing content in App.css. Only append the new block at the end of the file.
  </action>
  <verify>
1. grep -n "export default WeightInput" frontend/src/components/WeightInput.jsx
2. grep -n "export default RepsInput" frontend/src/components/RepsInput.jsx
3. grep -n "stepper-wrapper" frontend/src/App.css
  </verify>
  <done>WeightInput.jsx and RepsInput.jsx exist and export defaults. App.css contains .stepper-wrapper block. No existing CSS was removed.</done>
</task>

</tasks>

<verification>
Run the dev server and confirm no import errors:
cd /workspace/gravl/frontend && npm run build 2>&1 | tail -20

Expected: build succeeds (exit 0) or only pre-existing warnings. No "Cannot find module" errors.
</verification>

<success_criteria>
- StepperInput.jsx: controlled component, rejects negative input, +/- buttons 44px, font-size 16px, aria-labels present
- WeightInput.jsx: wraps StepperInput with step=2.5, suffix="kg"
- RepsInput.jsx: wraps StepperInput with step=1, no suffix
- App.css: stepper styles appended, all buttons min 44x44px, font-size 16px on .stepper-input
- Build passes with no new errors
</success_criteria>

<output>
After completion, create `.planning/phases/01-input-ux/01-01-SUMMARY.md` using the summary template.
</output>