feat(hackathon): add dark mode support with theme toggle

- Add ThemeProvider with system/light/dark mode support and localStorage persistence - Add ThemeToggle component for pages without sidebar (landing, login, signup) - Enable class-based dark mode in Tailwind CSS v4 via @custom-variant - Add dark mode classes to landing page, login, signup, and all dashboard pages - Keep IMPHNEN logo blue in dark mode, invert Kolosal logo 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-26 15:25:23 +07:00
parent c9f5b9e4a5
commit 1839f4cab0
18 changed files with 594 additions and 342 deletions
@@ -0,0 +1,100 @@
+import { createContext, useContext, useEffect, useState, FC, ReactNode } from 'react';
+
+type Theme = 'light' | 'dark' | 'system';
+
+interface ThemeContextType {
+  theme: Theme;
+  setTheme: (theme: Theme) => void;
+  resolvedTheme: 'light' | 'dark';
+}
+
+const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
+
+const STORAGE_KEY = 'hackathon-theme';
+
+function getSystemTheme(): 'light' | 'dark' {
+  if (typeof window !== 'undefined') {
+    return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+  }
+  return 'light';
+}
+
+interface ThemeProviderProps {
+  children: ReactNode;
+  defaultTheme?: Theme;
+}
+
+export const ThemeProvider: FC<ThemeProviderProps> = ({ children, defaultTheme = 'system' }) => {
+  const [theme, setThemeState] = useState<Theme>(() => {
+    if (typeof window !== 'undefined') {
+      const stored = localStorage.getItem(STORAGE_KEY) as Theme | null;
+      return stored || defaultTheme;
+    }
+    return defaultTheme;
+  });
+
+  const [resolvedTheme, setResolvedTheme] = useState<'light' | 'dark'>(() => {
+    if (theme === 'system') {
+      return getSystemTheme();
+    }
+    return theme;
+  });
+
+  const setTheme = (newTheme: Theme) => {
+    setThemeState(newTheme);
+    localStorage.setItem(STORAGE_KEY, newTheme);
+  };
+
+  useEffect(() => {
+    const root = document.documentElement;
+
+    // Calculate the resolved theme
+    const resolved = theme === 'system' ? getSystemTheme() : theme;
+    setResolvedTheme(resolved);
+
+    // Apply dark class to root
+    if (resolved === 'dark') {
+      root.classList.add('dark');
+    } else {
+      root.classList.remove('dark');
+    }
+  }, [theme]);
+
+  // Listen for system theme changes
+  useEffect(() => {
+    if (theme !== 'system') return;
+
+    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
+
+    const handleChange = (e: MediaQueryListEvent) => {
+      const newTheme = e.matches ? 'dark' : 'light';
+      setResolvedTheme(newTheme);
+
+      const root = document.documentElement;
+      if (newTheme === 'dark') {
+        root.classList.add('dark');
+      } else {
+        root.classList.remove('dark');
+      }
+    };
+
+    mediaQuery.addEventListener('change', handleChange);
+    return () => mediaQuery.removeEventListener('change', handleChange);
+  }, [theme]);
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme, resolvedTheme }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+};
+
+export function useTheme() {
+  const context = useContext(ThemeContext);
+  if (context === undefined) {
+    throw new Error('useTheme must be used within a ThemeProvider');
+  }
+  return context;
+}
+
+export default ThemeProvider;