export default function AdminLoading() {
  return (
    <div className="space-y-6" aria-busy="true" aria-label="Đang tải trang quản trị">
      {/* Header skeleton */}
      <div className="flex items-center justify-between">
        <div>
          <div className="h-7 w-36 animate-pulse rounded bg-muted" />
          <div className="mt-2 h-4 w-48 animate-pulse rounded bg-muted" />
        </div>
        <div className="h-9 w-24 animate-pulse rounded-md bg-muted" />
      </div>

      {/* Stats grid skeleton */}
      <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
        {Array.from({ length: 4 }).map((_, i) => (
          <div key={i} className="rounded-lg border bg-card p-6 shadow-sm">
            <div className="flex items-center justify-between">
              <div className="h-4 w-24 animate-pulse rounded bg-muted" />
              <div className="h-4 w-4 animate-pulse rounded bg-muted" />
            </div>
            <div className="mt-3 h-7 w-20 animate-pulse rounded bg-muted" />
            <div className="mt-2 h-3 w-28 animate-pulse rounded bg-muted" />
          </div>
        ))}
      </div>

      <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
        {Array.from({ length: 3 }).map((_, i) => (
          <div key={i} className="rounded-lg border bg-card p-6 shadow-sm">
            <div className="flex items-center justify-between">
              <div className="h-4 w-24 animate-pulse rounded bg-muted" />
              <div className="h-4 w-4 animate-pulse rounded bg-muted" />
            </div>
            <div className="mt-3 h-7 w-20 animate-pulse rounded bg-muted" />
          </div>
        ))}
      </div>

      {/* Revenue chart skeleton */}
      <div className="rounded-lg border bg-card shadow-sm">
        <div className="p-6">
          <div className="h-5 w-48 animate-pulse rounded bg-muted" />
        </div>
        <div className="px-6 pb-6">
          <div className="space-y-4">
            {Array.from({ length: 6 }).map((_, i) => (
              <div key={i} className="space-y-2">
                <div className="flex items-center justify-between">
                  <div className="h-3 w-20 animate-pulse rounded bg-muted" />
                  <div className="h-3 w-28 animate-pulse rounded bg-muted" />
                </div>
                <div className="h-2 w-full animate-pulse rounded-full bg-muted" />
              </div>
            ))}
          </div>
        </div>
      </div>
    </div>
  );
}
