As regras `.container>.row` e `.contact-form .row` usavam margem negativa de -15px (herança do Bootstrap 4), mas o container do Bootstrap 5 tem padding de 12px — sobrava 3px de overflow horizontal a 375px (scrollWidth 378 vs 375). Passaram a -0.75rem (o gutter real do BS5), anulando exatamente o padding. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>