### `style.css`
```css
/*
Theme Name: AMPLIFY TT5 Child
Template: twentytwentyfive
Text Domain: amplify-tt5-child
*/

/* Make bold actually bold (front end + editor) */
:where(.wp-site-blocks, .editor-styles-wrapper) strong,
:where(.wp-site-blocks, .editor-styles-wrapper) b {
  font-weight: 650 !important;
}

html, body, .wp-site-blocks {
    font-size: 20px; /* or 20px if you want it clearly larger */
    font-weight: 500;
  }

strong {
	    font-weight: 900;
}

:root { font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, sans-serif; }

@supports (font-variation-settings: normal) {
  :root {
    font-family: InterVariable, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    font-optical-sizing: auto;
  }
}

@media (max-width: 600px) {
  html, body, .wp-site-blocks {
    font-size: 22px; /* or 20px if you want it clearly larger */
    font-weight: 500;
  }
}