diff --git a/apps/storybook/src/Foundations.stories.tsx b/apps/storybook/src/Foundations.stories.tsx
index 112c54a..7846cbf 100644
--- a/apps/storybook/src/Foundations.stories.tsx
+++ b/apps/storybook/src/Foundations.stories.tsx
@@ -708,13 +708,7 @@ function EaseRow({ name }: { name: string }) {
 // A preset player - clicking Play remounts the sample with the literal `animate-*` class so
 // the ACTUAL Tailwind utility runs. `animationName` is the preset's label, also used as the
 // badge text; the remount (key bump) restarts the "out" presets so they visibly animate away.
-function PresetPlayer({
-  cls,
-  animationName,
-}: {
-  cls: string;
-  animationName: string;
-}) {
+function PresetPlayer({ cls, animationName }: { cls: string; animationName: string }) {
   const [tick, setTick] = useState(0);
   return (
     <div style={{ display: 'flex', alignItems: 'center', gap: '0.75rem' }}>
@@ -876,7 +870,8 @@ function Motion() {
                     style={{
                       fontSize: 'var(--text-sm)',
                       color: 'var(--color-text)',
-                      background: 'color-mix(in srgb, var(--color-warning) 12%, var(--color-surface))',
+                      background:
+                        'color-mix(in srgb, var(--color-warning) 12%, var(--color-surface))',
                       borderLeft: '3px solid var(--color-warning)',
                       borderRadius: 'var(--radius-sm)',
                       padding: '0.5rem 0.75rem',
diff --git a/docs/feedback/0017-form-controls-ios-zoom.md b/docs/feedback/0017-form-controls-ios-zoom.md
new file mode 100644
index 0000000..8edbc07
--- /dev/null
+++ b/docs/feedback/0017-form-controls-ios-zoom.md
@@ -0,0 +1,33 @@
+# 0017 - Form controls auto-zoom on iOS
+
+Source: rogueoak.com subscribe form (rogueoak feedback 0002) - tapping a canopy `Input` on a phone
+zoomed the page. The same latent bug is in every canopy consumer, so it is fixed at the source here.
+
+## Symptom
+
+On iOS Safari, focusing a canopy `Input`, `Textarea`, or `Select` trigger zoomed the whole page in -
+a jarring shift the user then had to undo. Reproduced on rogueoak.com; applies to any consumer with
+these controls on a phone.
+
+## Root cause
+
+iOS Safari auto-zooms to a focused form control whenever its computed `font-size` is below **16px**.
+All three field controls used `text-sm` (14px) in their base class, so every one tripped the zoom.
+A platform rule the component defaults did not account for - not a consumer bug, so a per-app
+override (what rogueoak shipped first) is the wrong layer. The design system owns the default.
+
+## Fix
+
+Set the focusable field controls to `text-base md:text-sm`: **16px on mobile** (no iOS zoom) and
+**14px from the `md` breakpoint up** (preserves the denser desktop typography). Applied to `Input`,
+`Textarea`, and the `Select` trigger. The `SelectItem` / `SelectLabel` dropdown rows stay `text-sm` -
+they are not focusable text fields, so they never zoom. `md` is a width breakpoint, not a touch test,
+but that is the right proxy here: iOS auto-zoom is a small-viewport phone behavior, and phones sit
+below `md`. Each control gains a test asserting `text-base md:text-sm` (and not bare `text-sm`).
+
+## Learning
+
+**Interactive form controls must default to font-size >= 16px on mobile.** A 16px minimum on
+focusable fields is a design-system-level guarantee, not a per-app override - fix it once in the
+component so every consumer inherits it. Use `text-base md:text-sm` when the desktop design wants a
+denser 14px. Verify the computed size, not just the class.
diff --git a/docs/overview/learnings.md b/docs/overview/learnings.md
index efc8881..6fc1ec4 100644
--- a/docs/overview/learnings.md
+++ b/docs/overview/learnings.md
@@ -535,3 +535,16 @@ or a mid-flight glitch. For any spring/overshoot demo, size the stage for the **
 `travel x max-bezier-y`, add clearance) and prove the extreme is in-bounds by frame-sampling the
 live animation or freezing at the computed peak. Never ship a motion affordance you have not
 watched fire (a CSS `:hover` re-declaring an identical `animation-name` restarts nothing).
+
+## Form controls must default to >=16px on mobile (iOS auto-zoom)
+
+iOS Safari auto-zooms the page when a focused `<input>`/`<textarea>`/`<select>` has a computed
+font-size below 16px. `Input`, `Textarea`, and the `Select` trigger all shipped `text-sm` (14px), so
+every consumer hit the zoom on phones - surfaced downstream on rogueoak.com, then fixed at the source
+(feedback 0017), not per-app.
+
+**Apply it:** a focusable form control's mobile font-size must be >=16px. Default the field controls
+to `text-base md:text-sm` (16px on phones, 14px from `md` up) rather than a bare `text-sm`; a
+design-system default is a stronger guarantee than asking each consumer to override. This is a
+platform rule, not an aesthetic choice - verify the computed size, and remember `md` (width) is the
+right proxy since iOS zoom is a small-viewport phone behavior.
diff --git a/packages/canopy/src/seeds/Input.test.tsx b/packages/canopy/src/seeds/Input.test.tsx
index f133499..3e13d0a 100644
--- a/packages/canopy/src/seeds/Input.test.tsx
+++ b/packages/canopy/src/seeds/Input.test.tsx
@@ -20,6 +20,15 @@ describe('Input', () => {
     expect(input).toHaveClass('border', 'border-border', 'bg-surface', 'text-text', 'rounded-md');
   });
 
+  it('renders at 16px on mobile and 14px from md up (iOS anti-zoom, feedback 0017)', () => {
+    render(<Input aria-label="Field" />);
+    const input = screen.getByRole('textbox');
+    // text-base (16px) is the mobile default so iOS Safari does not auto-zoom on focus;
+    // md:text-sm restores the denser 14px on larger, non-zooming viewports.
+    expect(input).toHaveClass('text-base', 'md:text-sm');
+    expect(input).not.toHaveClass('text-sm');
+  });
+
   it('typing updates the value', async () => {
     const user = userEvent.setup();
     render(<Input aria-label="Field" />);
diff --git a/packages/canopy/src/seeds/Input.tsx b/packages/canopy/src/seeds/Input.tsx
index fd4ec06..da421b9 100644
--- a/packages/canopy/src/seeds/Input.tsx
+++ b/packages/canopy/src/seeds/Input.tsx
@@ -19,7 +19,10 @@ export const inputVariants = cva(
   // not text-subtle: subtle is AA-Large-only and placeholder is small text - review 0006); the
   // focus-visible ring (a11y); the disabled token pair (not opacity); and the aria-invalid
   // danger overrides for border + ring.
-  'flex w-full rounded-md border border-border bg-surface px-3 text-sm text-text placeholder:text-text-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-ring-offset disabled:cursor-not-allowed disabled:bg-disabled disabled:text-disabled-foreground aria-invalid:border-danger aria-invalid:ring-danger',
+  // Font size is `text-base md:text-sm`: 16px on mobile, 14px from md up. iOS Safari auto-zooms
+  // the page when a focused field is below 16px, so the base font must be >=16px on phones; the
+  // md breakpoint restores the denser 14px on larger (non-zooming) viewports (feedback 0017).
+  'flex w-full rounded-md border border-border bg-surface px-3 text-base md:text-sm text-text placeholder:text-text-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-ring-offset disabled:cursor-not-allowed disabled:bg-disabled disabled:text-disabled-foreground aria-invalid:border-danger aria-invalid:ring-danger',
   {
     variants: {
       size: {
diff --git a/packages/canopy/src/seeds/Select.test.tsx b/packages/canopy/src/seeds/Select.test.tsx
index b70dd9e..4280b72 100644
--- a/packages/canopy/src/seeds/Select.test.tsx
+++ b/packages/canopy/src/seeds/Select.test.tsx
@@ -55,6 +55,14 @@ describe('Select', () => {
     expect(trigger).toHaveClass('border-border', 'bg-surface', 'text-text', 'rounded-md', 'h-10');
   });
 
+  it('the trigger renders at 16px on mobile and 14px from md up (iOS anti-zoom, feedback 0017)', () => {
+    render(<Basic />);
+    const trigger = screen.getByRole('combobox');
+    // Input-parity: 16px on phones so iOS does not auto-zoom the focused trigger, 14px from md up.
+    expect(trigger).toHaveClass('text-base', 'md:text-sm');
+    expect(trigger).not.toHaveClass('text-sm');
+  });
+
   it('opens the listbox and shows the options on click', async () => {
     const user = userEvent.setup();
     render(<Basic />);
diff --git a/packages/canopy/src/seeds/Select.tsx b/packages/canopy/src/seeds/Select.tsx
index 50c21a0..66dc4cf 100644
--- a/packages/canopy/src/seeds/Select.tsx
+++ b/packages/canopy/src/seeds/Select.tsx
@@ -50,8 +50,11 @@ const SelectTrigger = React.forwardRef<
 >(({ className, children, ...props }, ref) => (
   <SelectPrimitive.Trigger
     ref={ref}
+    // Trigger font is `text-base md:text-sm` (16px mobile, 14px from md up): iOS Safari auto-zooms
+    // a focused control under 16px, so the trigger matches Input/Textarea (feedback 0017). The
+    // dropdown items below stay text-sm - they are not focusable text fields, so they never zoom.
     className={cn(
-      'flex h-10 w-full items-center justify-between rounded-md border border-border bg-surface px-3 text-sm text-text focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-ring-offset disabled:cursor-not-allowed disabled:bg-disabled disabled:text-disabled-foreground aria-invalid:border-danger aria-invalid:ring-danger data-[placeholder]:text-text-muted [&>span]:line-clamp-1',
+      'flex h-10 w-full items-center justify-between rounded-md border border-border bg-surface px-3 text-base md:text-sm text-text focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-ring-offset disabled:cursor-not-allowed disabled:bg-disabled disabled:text-disabled-foreground aria-invalid:border-danger aria-invalid:ring-danger data-[placeholder]:text-text-muted [&>span]:line-clamp-1',
       className,
     )}
     {...props}
diff --git a/packages/canopy/src/seeds/Textarea.test.tsx b/packages/canopy/src/seeds/Textarea.test.tsx
index 00696fd..3ccfccb 100644
--- a/packages/canopy/src/seeds/Textarea.test.tsx
+++ b/packages/canopy/src/seeds/Textarea.test.tsx
@@ -25,6 +25,13 @@ describe('Textarea', () => {
     );
   });
 
+  it('renders at 16px on mobile and 14px from md up (iOS anti-zoom, feedback 0017)', () => {
+    render(<Textarea aria-label="Field" />);
+    const textarea = screen.getByRole('textbox');
+    expect(textarea).toHaveClass('text-base', 'md:text-sm');
+    expect(textarea).not.toHaveClass('text-sm');
+  });
+
   it('typing updates the value', async () => {
     const user = userEvent.setup();
     render(<Textarea aria-label="Field" />);
diff --git a/packages/canopy/src/seeds/Textarea.tsx b/packages/canopy/src/seeds/Textarea.tsx
index 70e166b..8defad0 100644
--- a/packages/canopy/src/seeds/Textarea.tsx
+++ b/packages/canopy/src/seeds/Textarea.tsx
@@ -16,8 +16,11 @@ import { cn } from '../lib/cn';
  * multi-line, and `resize-y` so a reader can drag the field taller (height otherwise follows
  * the native `rows` prop).
  */
+// Font size is `text-base md:text-sm` (16px mobile, 14px from md up): iOS Safari auto-zooms a
+// focused field under 16px, so phones get 16px and larger viewports keep the denser 14px
+// (feedback 0017), matching Input.
 const textareaBase =
-  'flex w-full rounded-md border border-border bg-surface px-3 py-2 text-sm text-text placeholder:text-text-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-ring-offset disabled:cursor-not-allowed disabled:bg-disabled disabled:text-disabled-foreground aria-invalid:border-danger aria-invalid:ring-danger min-h-20 resize-y';
+  'flex w-full rounded-md border border-border bg-surface px-3 py-2 text-base md:text-sm text-text placeholder:text-text-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-ring-offset disabled:cursor-not-allowed disabled:bg-disabled disabled:text-disabled-foreground aria-invalid:border-danger aria-invalid:ring-danger min-h-20 resize-y';
 
 /**
  * TextareaProps - the native `<textarea>` attributes, verbatim. Textarea adds no bespoke props