/* PetiFlix 4.0 — acceso y registro coherentes con la aplicación móvil. */
@media (max-width: 599px) {
    body { font-size: 17px; }
    .brand-section { padding: 40px 24px 0; }
    .brand-icon { width: 72px; height: 72px; margin-bottom: 20px; border-radius: 20px; }
    .brand-title { font-size: 32px; }
    .brand-subtitle { font-size: 16px; line-height: 1.5; }
    .private-label { min-height: 28px; padding: 6px 12px; font-size: 11px; }
    .form-section { justify-content: center; padding: 28px 20px; }
    .form-card { padding: 24px 20px; border-radius: 20px; background: #111318; border-color: rgba(255,255,255,.10); backdrop-filter: none; }
    .field { margin-bottom: 20px; }
    .field-label { font-size: 14px; color: rgba(255,255,255,.68); }
    .field-input { height: 56px; font-size: 17px; border-color: rgba(255,255,255,.12); background: #181b21; }
    .submit-btn { height: 58px; font-size: 17px; box-shadow: none; }
    .auth-footer p, .auth-footer a { font-size: 15px; }
    .install-btn { min-height: 48px; font-size: 14px; }
    .nav-bar { min-height: 64px; padding: 10px 16px; }
    .nav-back { min-height: 48px; font-size: 17px; }
    .nav-title { font-size: 18px; }
    .form-scroll { padding: 12px 20px 32px; }
    .reg-header { padding: 16px 0 24px; }
    .reg-brand-mark { width: 64px; height: 64px; }
    .reg-header h1 { font-size: 30px; }
    .reg-header p { font-size: 16px; }
}