update KIT banner with KITT red gradient and simplify description

cmd/root.go

@@ -86,34 +86,7 @@ func (a *agentUIAdapter) GetLoadedServerNames() []string {
 var rootCmd = &cobra.Command{
 	Use:   "kit",
 	Short: "Chat with AI models through a unified interface",
-	Long: `KIT is a CLI tool that allows you to interact with various AI models
-through a unified interface. It supports various tools through MCP servers
-and provides streaming responses.
-
-Available models can be specified using the --model flag:
-- Anthropic Claude (default): anthropic/claude-sonnet-4-5-20250929
-- OpenAI: openai/gpt-4
-- Ollama models: ollama/modelname
-- Google: google/modelname
-
-Examples:
-  # Interactive mode
-  kit -m ollama/qwen2.5:3b
-  kit -m openai/gpt-4
-  kit -m google/gemini-2.0-flash
-  
-  # Non-interactive mode
-  kit -p "What is the weather like today?"
-  kit -p "Calculate 15 * 23" --quiet
-  
-  # Session management
-  kit --save-session ./my-session.json -p "Hello"
-  kit --load-session ./my-session.json -p "Continue our conversation"
-  kit --load-session ./session.json --save-session ./session.json -p "Next message"
-  kit --session ./session.json -p "Next message"
-  
-  # Script mode
-  kit script myscript.sh`,
+	Long:  `KIT (Knowledge Inference Tool) — A lightweight AI agent for coding`,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		return runKit(context.Background())
 	},
@@ -252,18 +225,28 @@ func configToUiTheme(theme config.Theme) ui.Theme {
 }
 
 // kitBanner returns the KIT ASCII art title with KITT scanner lights,
-// rendered in KITT red using lipgloss.
+// rendered with a KITT red gradient.
 func kitBanner() string {
-	style := lipgloss.NewStyle().Foreground(lipgloss.Color("#CC0000"))
-	banner :=
-		"            ██╗  ██╗ ██╗ ████████╗\n" +
-			"            ██║ ██╔╝ ██║ ╚══██╔══╝\n" +
-			"            █████╔╝  ██║    ██║\n" +
-			"            ██╔═██╗  ██║    ██║\n" +
-			"            ██║  ██╗ ██║    ██║\n" +
-			"            ╚═╝  ╚═╝ ╚═╝    ╚═╝\n" +
-			" ░░░░░░▒▒▒▒▒▓▓▓▓███████████████▓▓▓▓▒▒▒▒▒░░░░░░"
-	return style.Render(banner)
+	kittDark := lipgloss.Color("#8B0000")
+	kittBright := lipgloss.Color("#FF2200")
+	lines := []string{
+		"            ██╗  ██╗ ██╗ ████████╗",
+		"            ██║ ██╔╝ ██║ ╚══██╔══╝",
+		"            █████╔╝  ██║    ██║",
+		"            ██╔═██╗  ██║    ██║",
+		"            ██║  ██╗ ██║    ██║",
+		"            ╚═╝  ╚═╝ ╚═╝    ╚═╝",
+		" ░░░░░░▒▒▒▒▒▓▓▓▓███████████████▓▓▓▓▒▒▒▒▒░░░░░░",
+	}
+
+	var result strings.Builder
+	for i, line := range lines {
+		if i > 0 {
+			result.WriteString("\n")
+		}
+		result.WriteString(ui.ApplyGradient(line, kittDark, kittBright))
+	}
+	return result.String()
 }
 
 func init() {

internal/ui/enhanced_styles.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"image/color"
 	"os"
+	"strings"
 
 	"charm.land/lipgloss/v2"
 )
@@ -202,15 +203,52 @@ func CreateBadge(text string, c color.Color) string {
 		Render(text)
 }
 
-// CreateGradientText creates styled text with a gradient-like effect. Currently
-// implements a simplified version using the start color only, as true gradients
-// require more complex terminal capabilities.
+// interpolateColor blends between two colors based on position (0.0 to 1.0)
+// using linear RGB channel interpolation.
+func interpolateColor(a, b color.Color, pos float64) color.Color {
+	r1, g1, b1, _ := a.RGBA()
+	r2, g2, b2, _ := b.RGBA()
+
+	r := uint8(float64(r1>>8)*(1-pos) + float64(r2>>8)*pos)
+	g := uint8(float64(g1>>8)*(1-pos) + float64(g2>>8)*pos)
+	bl := uint8(float64(b1>>8)*(1-pos) + float64(b2>>8)*pos)
+
+	return lipgloss.Color(fmt.Sprintf("#%02x%02x%02x", r, g, bl))
+}
+
+// ApplyGradient applies a color gradient from colorA to colorB across the text.
+// Uses ~8 color stops for performance rather than per-character coloring.
+func ApplyGradient(text string, colorA, colorB color.Color) string {
+	runes := []rune(text)
+	if len(runes) == 0 {
+		return text
+	}
+
+	const maxStops = 8
+	segmentSize := len(runes) / maxStops
+	if segmentSize < 1 {
+		segmentSize = 1
+	}
+
+	var result strings.Builder
+	for i := 0; i < len(runes); i += segmentSize {
+		end := i + segmentSize
+		if end > len(runes) {
+			end = len(runes)
+		}
+
+		pos := float64(i) / float64(len(runes))
+		c := interpolateColor(colorA, colorB, pos)
+		style := lipgloss.NewStyle().Foreground(c)
+		result.WriteString(style.Render(string(runes[i:end])))
+	}
+
+	return result.String()
+}
+
+// CreateGradientText creates styled text with a gradient effect between two colors.
 func CreateGradientText(text string, startColor, endColor color.Color) string {
-	// For now, just use the start color - true gradients would require more complex implementation
-	return lipgloss.NewStyle().
-		Foreground(startColor).
-		Bold(true).
-		Render(text)
+	return ApplyGradient(text, startColor, endColor)
 }
 
 // Compact styling utilities