import { browser } from '$app/environment';

/** Gate unique prefers-reduced-motion (playbook §6). */
export function prefersReducedMotion(): boolean {
	return browser && window.matchMedia('(prefers-reduced-motion: reduce)').matches;
}

/**
 * Stagger syncopé de marque OKI (3+3+2) — charte §3.
 * Délais en ms pour l'index donné (cycle de 8 éléments).
 */
const SYNCOPATED_DELAYS = [0, 120, 300, 360, 600, 660, 900, 960];

export function syncopatedDelay(index: number): number {
	const cycle = Math.floor(index / 8);
	return SYNCOPATED_DELAYS[index % 8] + cycle * 1200;
}