* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; overscroll-behavior: none; }
body { background: var(--bg); color: var(--text); font-family: var(--font); font-size: 14px; -webkit-font-smoothing: antialiased; }
.font-brand { font-family: var(--font-brand); }

/* Layout — Fixed topbar + fixed sidebar + scrollable main */
.app { display: grid; grid-template-columns: 230px 1fr; grid-template-rows: 56px 1fr; min-height: 100vh; }
.topbar { grid-column: 1/-1; background: var(--bg2); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 20px; gap: 14px; z-index: 200; position: fixed; top: 0; left: 0; right: 0; height: 56px; }
.sidebar { position: fixed; top: 56px; left: 0; bottom: 0; width: 230px; background: var(--bg2); border-right: 1px solid var(--border); padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; overflow-y: auto; z-index: 30; }
.main { grid-column: 2; margin-top: 56px; overflow-y: auto; height: calc(100vh - 56px); padding: 24px 28px 60px; scroll-behavior: smooth; }

/* Brand */
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; letter-spacing: -0.3px; }
.brand-icon { flex-shrink: 0; filter: drop-shadow(0 0 8px rgba(255,174,0,0.3)); }
.app-footer { position: fixed; bottom: 0; left: 230px; right: 0; display: flex; align-items: center; justify-content: center; gap: 10px; padding: 8px 20px; background: var(--bg1); border-top: 1px solid var(--border); z-index: 5; opacity: 0.7; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.menu-toggle { display: none; background: var(--bg3); border: 1px solid var(--border); border-radius: 7px; width: 34px; height: 34px; align-items: center; justify-content: center; cursor: pointer; color: var(--text2); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* Pages */
.page { display: none; }
.page.active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .4s ease, transform .4s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* Page-specific layouts */
.report-layout, .help-layout { display: grid; }

/* Responsive — Tablet (920px) */
@media (max-width: 920px) {
  .report-layout { grid-template-columns: 1fr !important; }
  .help-layout { grid-template-columns: 1fr !important; }
  .app { grid-template-columns: 1fr; grid-template-rows: 56px 1fr; }
  .sidebar { transform: translateX(-100%); transition: transform .25s; }
  .sidebar.open { transform: translateX(0); box-shadow: 0 0 40px rgba(0,0,0,0.6); }
  .main { grid-column: 1; margin-top: 56px; padding: 16px 16px 60px; }
  .menu-toggle { display: flex; }
  .two-col, .three-col, .form-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
  .section-header { flex-direction: column; align-items: flex-start; gap: 10px; margin: -16px -16px 16px; padding: 16px 16px 12px; }
  .brand span { display: none; }
  .app-footer { left: 0; }
}

/* Responsive — Mobile (520px) */
@media (max-width: 520px) {
  .topbar { padding: 0 12px; gap: 8px; }
  .topbar-search { display: none !important; }
  .role-switch { display: none !important; }
  .main { padding: 12px 12px 60px; }
  .stats-grid { grid-template-columns: 1fr; gap: 10px; }
  .stat-card { padding: 12px; }
  .stat-val { font-size: 22px; }
  .card { padding: 14px; }
  .section-header { margin: -12px -12px 14px; padding: 12px 12px 10px; top: -12px; }
  .section-title { font-size: 16px; }
  .section-sub { font-size: 12px; }
  .btn { padding: 8px 14px; font-size: 12px; }
  .btn-sm { padding: 5px 10px; font-size: 11px; }
  table { font-size: 12px; }
  th, td { padding: 8px 8px; }
  .modal { width: 100%; max-width: 100%; border-radius: 14px 14px 0 0; max-height: 85vh; }
  .modal-overlay { align-items: flex-end; padding: 0; }
  .form-grid { gap: 10px; }
  .alert-banner { padding: 10px 12px; font-size: 12px; }
  .chip { font-size: 11px; padding: 4px 10px; }
  .school-card { padding: 12px; }
}
.sidebar-backdrop { display: none; position: fixed; inset: 56px 0 0 0; background: rgba(0,0,0,0.5); z-index: 25; }
.sidebar-backdrop.show { display: block; }