@media (max-width: 768px) {
  .hamburger { display: block; }

  aside {
    position: fixed;
    left: -260px;
    top: 56px;
    bottom: 0;
    width: 260px;
    z-index: 100;
    transition: left 0.3s ease;
  }

  aside.open { left: 0; }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    top: 56px;
    background: rgba(0, 0, 0, 0.4);
    z-index: 99;
  }

  aside.open ~ .sidebar-backdrop { display: block; }

  .page-content { padding: 16px; }

  .page-title-row { flex-wrap: wrap; gap: 8px; }

  .dashboard-cards { grid-template-columns: 1fr; }
  .cashbox-grid { grid-template-columns: 1fr; }
  .categories-grid { grid-template-columns: 1fr; }

  .form-row { flex-direction: column; gap: 0; }
  .filters-bar { flex-direction: column; }

  .entries-table, .users-table { font-size: 13px; }
  .entries-table .description { max-width: 120px; }

  .chat-msg { max-width: 92%; }
  .chat-input-area { padding: 8px 12px; }
  .chat-messages { padding: 12px; }

  .modal { max-width: 100%; margin: 8px; }
}

@media (max-width: 480px) {
  header { padding: 0 12px; }
  .header-left h1 { font-size: 15px; }
  .header-user { display: none; }
  .chat-amount-input { width: 100px; }
}