@php
$groupedBrands = [];
foreach ($brands as $brand) {
$letter = strtoupper(substr($brand->marca, 0, 1));
if (in_array($letter, $allowedLetters)) {
$groupedBrands[$letter][] = $brand;
}
}
ksort($groupedBrands);
@endphp
@foreach ($groupedBrands as $letter => $brandsByLetter)
@endforeach