/* Responsive layout overrides for phones and small tablets. */
@media (max-width: 820px) {
  html, body { overflow-x: hidden; }
  .app-shell { display: block; min-height: 100svh; }
  body:not(.auth-locked) .app-shell { display: block !important; }
  .sidebar { width: 100%; height: auto; padding: 10px 12px 0; border-right: 0; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
  .brand { padding: 0 4px 9px; gap: 8px; }
  .brand>div:last-child { display: block; }
  .brand strong { font-size: 13px; }
  .brand span { font-size: 9px; }
  .brand-mark { margin: 0; width: 30px; height: 30px; font-size: 15px; }
  .workspace-switcher, .sidebar-bottom { display: none; }
  .main-nav { display: flex; gap: 4px; overflow-x: auto; overscroll-behavior-x: contain; padding: 0 0 8px; scrollbar-width: none; }
  .main-nav::-webkit-scrollbar { display: none; }
  .main-nav .nav-item { height: 42px; min-width: 76px; justify-content: center; padding: 0 8px; gap: 5px; white-space: nowrap; font-size: 10px; }
  .main-nav .nav-item span { width: auto; font-size: 15px; }
  .nav-item em { display: none; }
  .topbar { height: auto; min-height: 60px; padding: 10px 16px; gap: 10px; }
  .breadcrumb { display: none; }
  .top-actions { width: 100%; justify-content: flex-end; gap: 10px; }
  .global-search { width: min(48vw, 180px); }
  .page { padding: 22px 16px 34px; }
  .primary-btn, .ghost-btn, .filter-chip, .mini-tab, .tab, .quick-insert, .icon-btn { min-height: 38px; }
  .tab, .mini-tab { display: inline-flex; align-items: center; }
}
@media (max-width: 520px) {
  .auth-gate { padding: 14px; align-items: start; padding-top: max(14px, env(safe-area-inset-top)); }
  .auth-card { padding: 24px 20px; border-radius: 16px; margin-top: 4vh; }
  .auth-brand { margin-bottom: 22px; }
  .auth-brand strong { font-size: 16px; }
  .auth-card h1 { font-size: 21px; }
  .auth-card p { font-size: 12px; }
  .page-heading, .page-heading.compact { display: block; }
  .page-heading .primary-btn, .heading-actions { margin-top: 16px; }
  .heading-actions { display: flex; flex-wrap: wrap; }
  .heading-actions>* { flex: 1; min-width: 120px; }
  .metric-grid, .overview-grid, .lower-grid, .team-summary { grid-template-columns: 1fr; }
  .top-actions { gap: 7px; }
  .global-search { width: calc(100vw - 138px); min-width: 118px; }
  .top-avatar { flex-shrink: 0; }
  .context-strip { margin-left: 14px; margin-right: 14px; gap: 7px; flex-wrap: wrap; }
  .context-strip .text-btn { margin-left: 0; }
  .messages { height: 360px; padding: 16px 14px; }
  .message { max-width: 88%; }
  .chat-header { padding: 0 14px; }
  .reply-box { padding: 12px 14px; }
  .reply-toolbar { overflow-x: auto; white-space: nowrap; padding-bottom: 4px; }
  .reply-footer { align-items: flex-end; gap: 8px; }
  .reply-note { max-width: 52%; }
  .reply-footer .primary-btn { white-space: nowrap; }
}