Level AA (minimum required for accessibility compliance):
• Normal Text: Contrast ratio of at least 4.5:1
• Large Text: Contrast ratio of at least 3:1
• UI Components: Contrast ratio of at least 3:1

Level AAA (enhanced accessibility):
• Normal Text: Contrast ratio of at least 7:1
• Large Text: Contrast ratio of at least 4.5:1

Notes:
• "Large Text" is defined as 18pt or 14pt bold and above
• Logos and decorative elements have no minimum contrast requirement
• Text over images or gradients should be evaluated throughout the image