/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
  .da-auth-box { padding: 24px 18px; }
  .da-content { padding: 16px 14px 60px; }
  .da-topbar { padding: 0 14px; }
  .da-topbar-sub { display: none; }
  .da-account-danger {
    align-items: stretch;
    flex-direction: column;
  }
  .da-courses-grid { grid-template-columns: 1fr; }
  .da-form-row-2 { grid-template-columns: 1fr; }
  .da-course-header-meta { gap: 10px; }
}