CTA Button Hierarchy & Prominence Guide

Create a CTA button hierarchy system for {{product_name}}.

Define levels (primary, secondary, tertiary, danger):
1. Visual treatment: Color, border, shadow, size per level
2. Semantic use: When is each level appropriate? (Main action → primary, supporting actions → secondary)
3. Button size: Standard sizes (small, medium, large) and when to use each
4. Icon usage: Does button include icon? Icon placement (left, right, icon-only)?
5. States: default, hover, focus, active, disabled for each level
6. Grouping rules: How many primary buttons per screen/container? Secondary button max count?
7. Label guidelines: Action-oriented verbs, word count, punctuation

Provide a visual matrix showing all button combos (level + size + state).