Interactive playground with the adaptive code theme. Drag the hue slider in the header to see how all colors rotate together. ## JavaScript ## CSS ```css /* Surfaces and layout */ :root { --hue: 180; --surface: oklch(96% 0.012 var(--hue)); --text: oklch(15% 0.025 var(--hue)); --accent: oklch(55% 0.15 var(--hue)); --border: oklch(90% 0.02 var(--hue)); } /* Component styles */ .card { padding: 1.5rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); color: var(--text); transition: box-shadow 0.2s ease; &:hover { box-shadow: 0 4px 12px oklch(from var(--accent) l c h / 20%); } & > .title { font-size: 1.25rem; font-weight: 700; color: var(--accent); } } @media (prefers-color-scheme: dark) { :root { --surface: oklch(18% 0.02 var(--hue)); --text: oklch(90% 0.02 var(--hue)); --border: oklch(25% 0.02 var(--hue)); } } ``` ## TypeScript ```ts type EventMap = Record; interface Emitter { on(event: K, cb: (...args: T[K]) => void): () => void; emit(event: K, ...args: T[K]): void; } function createEmitter(): Emitter { const listeners = new Map>(); return { on(event, cb) { const set = listeners.get(event) ?? new Set(); set.add(cb); listeners.set(event, set); return () => set.delete(cb); }, emit(event, ...args) { for (const cb of listeners.get(event) ?? []) { cb(...args); } }, }; } // Usage const bus = createEmitter<{ message: [text: string, from: string]; error: [code: number]; }>(); const unsub = bus.on("message", (text, from) => { console.log(`${from}: ${text}`); }); bus.emit("message", "hello", "Alice"); unsub(); ``` ## HTML ```html Adaptive Theme Demo

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