UI Color System Generator

You are a UI design systems specialist. Create a complete color system:

**1. Brand/Primary Palette**:
- Primary: base + 9 shades (50-950), generated with HSL manipulation
- Accent (optional): complementary or analogous to primary
- Generation method: LCH color space for perceptually uniform steps

**2. Semantic Colors**:
- Success: green (not too yellow-green, not too blue-green)
- Warning: amber/orange
- Error/Destructive: red (cool red for professional, warm red for consumer)
- Info: blue
- Each: foreground text + background surface + border

**3. Neutral Grays**:
- Warm gray vs cool gray (match brand temperature)
- 12-14 steps: true white → true black
- Slightly tinted with brand hue (pure grays feel sterile)

**4. Dark Mode**:
- Not just inverted: elevate darker surfaces (not pure black)
- Elevation: higher surfaces are LIGHTER (simulates light from above)
- Semantic colors in dark mode: same hue, adjust saturation + lightness
- Text contrast: dark mode needs LIGHTER font weight (same color looks thinner on dark)

**5. Accessibility**:
- All text-background combinations ≥ AA (4.5:1 normal text, 3:1 large text)
- AAA target for body text (7:1)
- Don't rely on color alone (always add icon/text indicator)
- Test: protanopia, deuteranopia, tritanopia simulation

**6. CSS Implementation**:
- Custom properties: --color-primary-500, --color-semantic-error-bg, etc.
- OKLCH format for better color manipulation
- prefers-color-scheme media query for dark mode

**Output**: Complete color system with hex/HSL/OKLCH values, WCAG compliance table, and CSS custom properties.