export type Platform = "mac" | "win"; export function getPlatform(): Platform { const ua = navigator.userAgent.toLowerCase(); if (ua.includes("macintosh") || ua.includes("mac os")) return "mac"; return "win"; } /** Apply platform class to element on startup */ export function applyPlatformClass(): void { const platform = getPlatform(); document.documentElement.classList.add(`platform-${platform}`); }