dark-mode – skill Thiết kế & UI cho agent AI

Dark Mode Design

> "Not just inverted colors. A carefully constructed hierarchy of light on dark."

When to Use

Use this sub-style when the user's request matches the aesthetic described above. This is a child reference of the design-it skill and is not meant to be triggered directly.

Core Principles

1. Choose Surface Colors: Black and dark grey are both valid. OLED artifacts depend on the display; comfort depends on the user and lighting. Offer theme choice and test contrast.

2. Elevation via Lightness: Lighter surfaces and borders can clarify layers when shadows are subtle. Shadows are not universally invisible in dark mode.

3. Test Accents: Choose accent saturation for readable text and clear state indicators; avoid universal claims about discomfort.

Visual DNA

• Colors: Midnight Luxury or Minimalist Slate (inverted). Background #121212. Elevated cards #1E1E1E, #252525. Primary text #E1E1E1 (not #FFFFFF).
• Typography: Standard highly readable sans-serifs, but often dropped down one font weight compared to light mode, as light text on dark backgrounds appears optically thicker.
• Shadows: Pure black shadows, but with much lower opacity, mostly to separate slightly different shades of grey.

Web Implementation

• CSS Example:

:root {
  --bg-base: #121212;
  --bg-elevated-1: #1E1E1E;
  --bg-elevated-2: #242424;
  --text-high-emphasis: rgba(255, 255, 255, 0.87);
  --text-medium-emphasis: rgba(255, 255, 255, 0.60);
  
  /* Accent color: Desaturated purple instead of bright purple */
  --accent-color: #BB86FC; 
}

body {
  background-color: var(--bg-base);
  color: var(--text-high-emphasis);
  font-weight: 400; /* Preserve readable body weight; test with users. */
}

.dark-card {
  background-color: var(--bg-elevated-1);
  border-radius: 8px;
  padding: 24px;
  
  /* Very subtle border can help separate dark surfaces */
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.dark-card:hover {
  /* On hover, the element moves closer to the user, so it gets lighter */
  background-color: var(--bg-elevated-2);
}

.dark-btn {
  background-color: var(--accent-color);
  color: #000; /* Dark text on light accent is highly readable */
  font-weight: 600;
  border: none;
  padding: 12px 24px;
  border-radius: 4px;
}

App Implementation

SwiftUI

struct DarkModeView: View {
    // Force Dark Mode on this specific view (or use system settings)
    @Environment(\.colorScheme) var colorScheme
    
    var body: some View {
        ScrollView {
            VStack(spacing: 20) {
                // Primary elevated card
                VStack(alignment: .leading, spacing: 12) {
                    Text("Elevation via Lightness")
                        .font(.headline)
                        .foregroundColor(.primary) // Auto-adapts
                    Text("In dark mode, elevated surfaces are lighter grey, not shadowed.")
                        .font(.subheadline)
                        .foregroundColor(.secondary) // Auto-adapts
                }
                .padding()
                .frame(maxWidth: .infinity, alignment: .leading)
                // Use native semantic colors. .secondarySystemBackground is lighter than .systemBackground
                .background(Color(UIColor.secondarySystemBackground))
                .cornerRadius(12)
                
                // Desaturated Accent Button
                Button(action: {}) {
                    Text("Desaturated Accent")
                        .fontWeight(.semibold)
                        .foregroundColor(.black) // Dark text on light accent
                        .padding()
                        .frame(maxWidth: .infinity)
                        .background(Color(red: 0.73, green: 0.52, blue: 0.98)) // #BB86FC (Desaturated purple)
                        .cornerRadius(8)
                }
            }
            .padding()
        }
        // Semantic systemBackground follows platform appearance; dark iOS may use black.
        .background(Color(UIColor.systemBackground))
    }
}
// .preferredColorScheme(.dark) to force

• Rely on Semantics: SwiftUI's Color.primary, Color.secondary, Color(UIColor.systemBackground) and Color(UIColor.secondarySystemBackground) adapt to platform appearance; verify custom combinations and increased-contrast settings.
• Avoid forcing explicit hex codes for backgrounds unless you are building a custom-themed app.

Flutter

import 'package:flutter/material.dart';

class DarkModeApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // Configure the Dark Theme
      themeMode: ThemeMode.dark,
      darkTheme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: const Color(0xFF121212), // Standard dark background
        cardColor: const Color(0xFF1E1E1E), // Elevated surface
        colorScheme: const ColorScheme.dark().copyWith(
          primary: const Color(0xFFBB86FC), // Desaturated accent
          onPrimary: Colors.black, // Dark text on light accent
          surface: const Color(0xFF1E1E1E),
        ),
      ),
      home: Scaffold(
        appBar: AppBar(title: const Text('Dark Mode', style: TextStyle(color: Colors.white70))),
        body: ListView(
          padding: const EdgeInsets.all(16),
          children: [
            Card(
              elevation: 0, // Shadows don't show well anyway
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(12),
                side: BorderSide(color: Colors.white.withOpacity(0.05)), // Subtle border
              ),
              child: const Padding(
                padding: EdgeInsets.all(16.0),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text('Elevation via Lightness', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
                    SizedBox(height: 8),
                    Text('Elevated surfaces use lighter greys.', style: TextStyle(color: Colors.white60)),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 20),
            ElevatedButton(
              onPressed: () {},
              child: const Text('Desaturated Accent'),
            ),
          ],
        ),
      ),
    );
  }
}

• When using ThemeData.dark(), actively override scaffoldBackgroundColor to #121212 and cardColor to #1E1E1E.
• Ensure your colorScheme.onPrimary is black so text is readable when placed on top of your desaturated primary accent button.

React Native

import { useColorScheme } from 'react-native';

const DarkModeScreen = () => {
  const isDark = useColorScheme() === 'dark';
  
  // Custom dark theme dictionary
  const theme = {
    bgBase: isDark ? '#121212' : '#FFFFFF',
    bgElevated: isDark ? '#1E1E1E' : '#F5F5F5',
    textHigh: isDark ? 'rgba(255, 255, 255, 0.87)' : 'rgba(0, 0, 0, 0.87)',
    textMedium: isDark ? 'rgba(255, 255, 255, 0.60)' : 'rgba(0, 0, 0, 0.60)',
    accent: isDark ? '#BB86FC' : '#6200EE', // Desaturated for dark, vibrant for light
    onAccent: isDark ? '#000' : '#FFF',
  };

  return (
    <View style={{ flex: 1, backgroundColor: theme.bgBase, padding: 16 }}>
      <View style={{
        backgroundColor: theme.bgElevated,
        padding: 24,
        borderRadius: 12,
        borderWidth: isDark ? 1 : 0,
        borderColor: 'rgba(255,255,255,0.05)',
        marginBottom: 20
      }}>
        <Text style={{ color: theme.textHigh, fontSize: 18, fontWeight: 'bold', marginBottom: 8 }}>
          Elevation via Lightness
        </Text>
        <Text style={{ color: theme.textMedium }}>
          Elevated surfaces use lighter greys.
        </Text>
      </View>

      <TouchableOpacity style={{
        backgroundColor: theme.accent,
        padding: 16,
        borderRadius: 8,
        alignItems: 'center'
      }}>
        <Text style={{ color: theme.onAccent, fontWeight: 'bold' }}>Desaturated Accent</Text>
      </TouchableOpacity>
    </View>
  );
};

• Rely on useColorScheme() hook from React Native.
• Define a strict dictionary of your color tokens. Notice how theme.accent shifts from a vibrant purple (#6200EE) in light mode to a desaturated pastel purple (#BB86FC) in dark mode.

Jetpack Compose

@Composable
fun DarkModeScreen() {
    // Typically this logic lives in your Theme.kt
    val darkColors = darkColorScheme(
        background = Color(0xFF121212),
        surface = Color(0xFF1E1E1E),
        primary = Color(0xFFBB86FC),
        onPrimary = Color.Black,
        onBackground = Color.White.copy(alpha = 0.87f),
        onSurface = Color.White.copy(alpha = 0.87f)
    )

    MaterialTheme(colorScheme = darkColors) {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .background(MaterialTheme.color

… (nội dung đầy đủ có trong gói tải về)