gpui-styling

# GPUI Styling

## Metadata

This skill provides comprehensive guidance on GPUI's styling system, theme management, and visual design patterns for creating beautiful, consistent user interfaces.

## Instructions

### Styling API Fundamentals

#### Basic Styling

```rust
use gpui::*;

div()
    // Colors
    .bg(rgb(0x2563eb))           // Background
    .text_color(white())          // Text color
    .border_color(rgb(0xe5e7eb)) // Border color

    // Spacing
    .p_4()                        // Padding: 1rem
    .px_6()                       // Padding horizontal
    .py_2()                       // Padding vertical
    .m_4()                        // Margin
    .gap_3()                      // Gap between children

    // Sizing
    .w_64()                       // Width: 16rem
    .h_32()                       // Height: 8rem
    .w_full()                     // Width: 100%
    .h_full()                     // Height: 100%

    // Borders
    .border_1()                   // Border: 1px
    .rounded_lg()                 // Border radius: large
```

#### Color Types

```rust
// RGB from hex
let blue = rgb(0x2563eb);

// RGBA with alpha
let transparent_blue = rgba(0x2563eb, 0.5);

// HSLA (hue, saturation, lightness, alpha)
let hsla_color = hsla(0.6, 0.8, 0.5, 1.0);

// Named colors
let white = white();
let black = black();
```

#### Layout with Flexbox

```rust
div()
    .flex()                      // Enable flexbox
    .flex_row()                  // Horizontal layout
    .flex_col()                  // Vertical layout
    .items_center()              // Align items center
    .justify_between()           // Space between
    .gap_4()                     // Gap between items
    .child(/* ... */)
    .child(/* ... */)
```

### Theme System

#### Basic Theme Structure

```rust
use gpui::*;

#[derive(Clone)]
pub struct AppTheme {
    pub colors: ThemeColors,
    pub typography: Typography,
    pub spacing: Spacing,
    pub shadows: Shadows,
}

#[derive(Clone)]
p