/* ═══════════════════════════════════════════════════════
   PSDM Student Manager — Responsive
═══════════════════════════════════════════════════════ */

/* ─── Tablet & below (900px) ────────────────────────── */
@media (max-width: 900px) {
  :root { --sidebar-w: 0px; }

  .hamburger { display: flex; }

  #app-sidebar {
    transform: translateX(-240px);
    width: 240px;
    z-index: 150;
    box-shadow: var(--shadow-xl);
  }
  #app-sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,.5);
    backdrop-filter: blur(2px);
    z-index: 140;
  }
  .sidebar-overlay.show { display: block; }

  #main-content {
    margin-left: 0;
    padding: 16px;
    max-width: 100vw;
  }

  .form-row-2,
  .form-row-3 { grid-template-columns: 1fr; }

  .grid-2,
  .grid-3    { grid-template-columns: 1fr; }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .page-header { flex-direction: column; align-items: flex-start; }
  .page-actions { width: 100%; }

  .modal {
    max-width: 100%;
    border-radius: var(--radius) var(--radius) 0 0;
    max-height: 95vh;
  }
  .modal-overlay {
    align-items: flex-end;
    padding: 0;
  }
  .modal-overlay.open .modal {
    transform: translateY(0) scale(1);
  }

  #header-inst-name { display: none; }
}

/* ─── Mobile (640px) ────────────────────────────────── */
@media (max-width: 640px) {
  :root { --header-h: 54px; }

  #main-content { padding: 12px; }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .stat-card { padding: 14px; }
  .stat-val  { font-size: 24px; }
  .stat-icon { font-size: 22px; }

  .page-title { font-size: 18px; }

  .card { padding: 14px; }

  .btn { padding: 8px 14px; }
  .btn-lg { padding: 11px 20px; font-size: 14px; }

  #toast-container {
    bottom: 14px;
    right: 14px;
    left: 14px;
    max-width: none;
  }

  .reminder-card { flex-direction: column; }
  .reminder-actions { width: 100%; justify-content: flex-end; }

  .tbl th, .tbl td { padding: 9px 10px; font-size: 13px; }

  .keypad { max-width: 220px; }
  .key { padding: 14px 10px; font-size: 18px; }

  .filter-bar { padding: 10px; }
  .search-input { min-width: 100%; }

  #header-user-role { display: none; }
  #header-user { padding: 5px 10px 5px 5px; }
}

/* ─── Small mobile (400px) ──────────────────────────── */
@media (max-width: 400px) {
  .stats-grid { grid-template-columns: 1fr; }
  .form-row-2 { grid-template-columns: 1fr; }
}

/* ─── Print ─────────────────────────────────────────── */
@media print {
  #app-sidebar,
  #app-header,
  #toast-container,
  .btn,
  .filter-bar,
  .page-actions,
  #offline-banner { display: none !important; }

  #main-content {
    margin: 0;
    padding: 0;
    max-width: 100%;
  }

  .card {
    box-shadow: none;
    border: 1px solid #dee2e6;
    break-inside: avoid;
  }

  .tbl { font-size: 11px; }
  .tbl th { background: #f8fafc; }
}