Monochromatic UI

:root {
  /* Base Hue: Deep Blue (210) */
  --mono-900: hsl(210, 80%, 10%); /* Very dark */
  --mono-700: hsl(210, 70%, 30%); /* Dark */
  --mono-500: hsl(210, 60%, 50%); /* Base */
  --mono-300: hsl(210, 50%, 80%); /* Light */
  --mono-100: hsl(210, 40%, 95%); /* Very light background */
}

body {
  background-color: var(--mono-100);
  color: var(--mono-900);
  font-family: 'Inter', sans-serif;
}

.mono-card {
  background-color: #ffffff; /* Or mono-100 */
  border: 1px solid var(--mono-300);
  border-radius: 8px;
  padding: 32px;
  /* Tinted shadow */
  box-shadow: 0 10px 25px hsla(210, 80%, 10%, 0.05);
}

.mono-btn {
  background-color: var(--mono-500);
  color: #ffffff;
  border: none;
  border-radius: 4px;
  padding: 12px 24px;
  transition: background-color 0.2s;
}

.mono-btn:hover {
  background-color: var(--mono-700);
}

.mono-subtext {
  color: var(--mono-500); /* Use mid-tones for secondary text */
  font-weight: 500;
}

struct MonochromaticView: View {
    // Base Hue: Deep Blue (210 in 360-degree HSB/HSL)
    // In SwiftUI, hue is 0.0 to 1.0 (210/360 = 0.58)
    let mono900 = Color(hue: 0.58, saturation: 0.80, brightness: 0.10)
    let mono700 = Color(hue: 0.58, saturation: 0.70, brightness: 0.30)
    let mono500 = Color(hue: 0.58, saturation: 0.60, brightness: 0.50)
    let mono300 = Color(hue: 0.58, saturation: 0.50, brightness: 0.80)
    let mono100 = Color(hue: 0.58, saturation: 0.40, brightness: 0.95)
    
    var body: some View {
        VStack(spacing: 24) {
            // Card
            VStack(alignment: .leading, spacing: 12) {
                Text("Monochromatic Elegance")
                    .font(.title2).fontWeight(.semibold)
                    .foregroundColor(mono900)
                
                Text("Using only variations in saturation and brightness of a single hue.")
                    .foregroundColor(mono500)
            }
            .padding(32)
            .background(Color.white)
            .border(mono300, width: 1)
            .shadow(color: mono900.opacity(0.1), radius: 15, y: 5) // Tinted shadow
            
            // Button
            Button(action: {}) {
                Text("Primary Action")
                    .fontWeight(.bold)
                    .foregroundColor(.white)
                    .frame(maxWidth: .infinity)
                    .padding()
                    .background(mono500)
                    .cornerRadius(8)
            }
        }
        .padding()
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .background(mono100)
    }
}

class MonochromaticScreen extends StatelessWidget {
  // Base Hue: Deep Blue (210)
  // Flutter HSVColor uses Hue 0-360, Saturation 0.0-1.0, Value 0.0-1.0
  final Color mono900 = const HSVColor.fromAHSV(1.0, 210, 0.80, 0.10).toColor();
  final Color mono500 = const HSVColor.fromAHSV(1.0, 210, 0.60, 0.50).toColor();
  final Color mono300 = const HSVColor.fromAHSV(1.0, 210, 0.50, 0.80).toColor();
  final Color mono100 = const HSVColor.fromAHSV(1.0, 210, 0.40, 0.95).toColor();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: mono100,
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(24.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              // Card
              Container(
                width: double.infinity,
                padding: const EdgeInsets.all(32),
                decoration: BoxDecoration(
                  color: Colors.white,
                  border: Border.all(color: mono300),
                  borderRadius: BorderRadius.circular(8),
                  boxShadow: [
                    BoxShadow(color: mono900.withOpacity(0.1), blurRadius: 15, offset: const Offset(0, 5))
                  ],
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text('Monochromatic', style: TextStyle(fontSize: 24, fontWeight: FontWeight.w600, color: mono900)),
                    const SizedBox(height: 12),
                    Text('Variations of a single hue.', style: TextStyle(fontSize: 16, color: mono500)),
                  ],
                ),
              ),
              const SizedBox(height: 24),
              // Button
              ElevatedButton(
                onPressed: () {},
                style: ElevatedButton.styleFrom(
                  backgroundColor: mono500,
                  foregroundColor: Colors.white,
                  minimumSize: const Size(double.infinity, 56),
                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
                  elevation: 0,
                ),
                child: const Text('Primary Action', style: TextStyle(fontWeight: FontWeight.bold)),
              ),
            ],
          ),
        ),
      ),
    );
  }
}