.mobile-menu-toggle { display: none; }
@media (max-width: 720px) {
  .sidebar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; padding: 16px 20px; }
  .sidebar .brand { font-size: 1.75rem; }
  .mobile-menu-toggle:not([hidden]) { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; padding: 8px 14px; border: 1px solid var(--border); border-radius: 8px; background: var(--paper); color: var(--text); font-size: 1rem; }
  .sidebar nav { flex-basis: 100%; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; overflow: visible; margin-top: 4px; padding-bottom: 0; }
  .navigation-ready .sidebar:not(.menu-open) nav { display: none; }
  .sidebar .nav-link { min-width: 0; min-height: 52px; padding: 12px; font-size: 1rem; gap: 10px; line-height: 1.45; }
  .sidebar .nav-link span { overflow-wrap: anywhere; }
  .sidebar .nav-link svg { width: 20px; height: 20px; }
  .topbar { padding: 10px 20px; min-height: 64px; }
  .breadcrumb { display: none; }
  .top-actions { width: 100%; justify-content: space-between; gap: 10px; }
  .top-save { padding-left: 0; border-left: 0; }
  main { padding: 28px 20px 24px; overflow-wrap: break-word; }
  .page-heading h1 { font-size: 1.75rem; letter-spacing: -.035em; }
  .page-heading p { margin-top: 10px; }
  .panel, .question-panel { padding: 22px 18px; border-radius: 12px; }
  .hero { border-radius: 14px; }
  .hero-copy { padding: 24px 20px; }
  .hero h2 { font-size: 1.875rem; }
  .hero-label { letter-spacing: .06em; }
  .hero-meta { display: block; line-height: 1.7; }
  .hero-meta svg, .hero-meta > span { display: none; }
  .hero .button { width: 100%; }
  .stats-grid { gap: 14px; }
  .stat-card { padding: 20px; }
  .stat-value { font-size: 2rem; }
  .button, .filter-tabs button, input:not([type=radio]):not([type=checkbox]), select { min-height: 48px; }
  .answer-option { padding: 18px 14px; align-items: flex-start; }
  .answer-option > span:last-child { min-width: 0; overflow-wrap: anywhere; }
  .question-actions { gap: 16px; }
  .question-actions .button { width: 100%; }
  .drill-clock { margin: 12px 0 0; flex-wrap: wrap; }
  .auth-panel { padding: 24px 18px; }
  .auth-panel h1 { font-size: 1.75rem; }
  .parent-metrics { gap: 20px; }
  .student-card .section-heading { gap: 16px; }
  .student-card .button, .parent-invite .button { width: 100%; }
  .parent-detail-grid { gap: 18px; }
  .parent-table.mobile-cards { display: block; min-width: 0; }
  .parent-table.mobile-cards thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .parent-table.mobile-cards tbody { display: grid; gap: 16px; }
  .parent-table.mobile-cards tr { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); }
  .parent-table.mobile-cards th, .parent-table.mobile-cards td { display: block; border: 0; padding: 8px 4px; overflow-wrap: anywhere; }
  .parent-table.mobile-cards th { grid-column: 1 / -1; font-size: 1.125rem; font-weight: 700; }
  .parent-table.mobile-cards td::before { content: attr(data-label); display: block; color: var(--muted); font-size: 1rem; font-weight: 550; margin-bottom: 6px; }
  .parent-table.mobile-cards td:last-child { grid-column: 1 / -1; }
  footer { display: block; line-height: 1.8; }
  footer > a { display: block; padding-top: 12px; }
}
@media (min-width: 390px) and (max-width: 720px) {
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-card { padding: 16px; }
  .stat-label { align-items: flex-start; gap: 8px; }
}
@media (max-width: 360px) {
  main { padding-inline: 14px; }
  .sidebar { padding-inline: 14px; }
  .sidebar nav { grid-template-columns: minmax(0, 1fr); }
  .streak-chip { display: none; }
}