/* FS AI — responsive layout. Breakpoints: 900px (tablet), 640px (phone). */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-ring { display: none; }
  .tool-layout { grid-template-columns: 1fr; }
  .tool-list { flex-direction: row; flex-wrap: wrap; }
  .tool-chip { flex: 1 1 45%; }
  .two-col { grid-template-columns: 1fr; }
  .section { padding: 40px 0; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .header-inner { flex-wrap: wrap; gap: 10px; padding-top: 8px; padding-bottom: 8px; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none; flex-direction: column; width: 100%; margin-left: 0;
    background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 8px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 14px; }
  .header-actions { margin-left: auto; }
  .hero { padding: 44px 0 40px; }
  .hero h1 { font-size: 32px; }
  .hero p.lead { font-size: 16px; }
  .search-box { flex-direction: column; }
  .search-box .btn { width: 100%; }
  .grid { grid-template-columns: 1fr; }
  .section-head h2 { font-size: 24px; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .tool-chip { flex: 1 1 100%; }
  .newsletter form { flex-direction: column; }
  .newsletter .btn { width: 100%; }
  table { font-size: 14px; }
  th, td { padding: 8px; }
  #divisionChart { height: 280px; }
}
@media (min-width: 641px) {
  .main-nav { display: flex !important; }
}