npx farsiui@latest add font-xb-kayhan

app/
└── fonts/
    └── xb-kayhan/
        ├── XBKayhan-Regular.woff2
        ├── XBKayhan-Bold.woff2
        ├── XBKayhan-Italic.woff2
        ├── XBKayhan-BoldItalic.woff2
        ├── font-face.css
        ├── LICENSE
        └── OFL.txt

import localFont from "next/font/local"

const xbKayhan = localFont({
  src: "./fonts/xb-kayhan/XBKayhan-Regular.woff2",
  variable: "--font-xb-kayhan",
  weight: "400",
  display: "swap",
})

export default function RootLayout({
  children,
}: {
  children: React.ReactNode
}) {
  return (
    <html
      lang="fa"
      dir="rtl"
      className={`${xbKayhan.variable} ${xbKayhan.className}`}
    >
      <body className="antialiased">{children}</body>
    </html>
  )
}

@theme inline {
  --font-sans: var(--font-xb-kayhan), ui-sans-serif, system-ui, sans-serif;
}

body {
  font-family: var(--font-xb-kayhan), ui-sans-serif, system-ui, sans-serif;
}