init

src/components/Button.tsx

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+import Link from 'next/link'
+import clsx from 'clsx'
+
+const baseStyles = {
+  solid:
+    'group inline-flex items-center justify-center rounded-full py-2 px-4 text-sm font-semibold focus-visible:outline-2 focus-visible:outline-offset-2',
+  outline:
+    'group inline-flex ring-1 items-center justify-center rounded-full py-2 px-4 text-sm',
+}
+
+const variantStyles = {
+  solid: {
+    slate:
+      'bg-slate-900 text-white hover:bg-slate-700 hover:text-slate-100 active:bg-slate-800 active:text-slate-300 focus-visible:outline-slate-900',
+    blue: 'bg-blue-600 text-white hover:text-slate-100 hover:bg-blue-500 active:bg-blue-800 active:text-blue-100 focus-visible:outline-blue-600',
+    white:
+      'bg-white text-slate-900 hover:bg-blue-50 active:bg-blue-200 active:text-slate-600 focus-visible:outline-white',
+  },
+  outline: {
+    slate:
+      'ring-slate-200 text-slate-700 hover:text-slate-900 hover:ring-slate-300 active:bg-slate-100 active:text-slate-600 focus-visible:outline-blue-600 focus-visible:ring-slate-300',
+    white:
+      'ring-slate-700 text-white hover:ring-slate-500 active:ring-slate-700 active:text-slate-400 focus-visible:outline-white',
+  },
+}
+
+type ButtonProps = (
+  | {
+      variant?: 'solid'
+      color?: keyof typeof variantStyles.solid
+    }
+  | {
+      variant: 'outline'
+      color?: keyof typeof variantStyles.outline
+    }
+) &
+  (
+    | Omit<React.ComponentPropsWithoutRef<typeof Link>, 'color'>
+    | (Omit<React.ComponentPropsWithoutRef<'button'>, 'color'> & {
+        href?: undefined
+      })
+  )
+
+export function Button({ className, ...props }: ButtonProps) {
+  props.variant ??= 'solid'
+  props.color ??= 'slate'
+
+  className = clsx(
+    baseStyles[props.variant],
+    props.variant === 'outline'
+      ? variantStyles.outline[props.color]
+      : props.variant === 'solid'
+        ? variantStyles.solid[props.color]
+        : undefined,
+    className,
+  )
+
+  return typeof props.href === 'undefined' ? (
+    <button className={className} {...props} />
+  ) : (
+    <Link className={className} {...props} />
+  )
+}