/* Mobile-first enhancements + PWA safe areas */
:root {
  --mobile-tab-height: 56px;
  --mobile-tab-total: calc(var(--mobile-tab-height) + env(safe-area-inset-bottom, 0px));
  --mobile-header-total: calc(var(--topbar-height) + env(safe-area-inset-top, 0px));
}

@supports (padding: max(0px)) {
  body.has-mobile-ui {
    padding-bottom: max(0px, env(safe-area-inset-bottom));
  }
}

@media (max-width: 900px) {
  body:not(.hide-nav):not(.messenger-has-chat) {
    --app-content-pad-bottom: var(--mobile-tab-total);
  }

  body.has-mobile-ui .app-content {
    padding-bottom: calc(var(--space-md) + var(--mobile-tab-total));
  }

  body.messenger-page.has-mobile-ui .app-content {
    padding-bottom: var(--space-sm);
  }

  body.messenger-has-chat.has-mobile-ui .app-content {
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  .app-mobile-bar {
    padding-top: max(0.35rem, env(safe-area-inset-top));
    min-height: var(--mobile-header-total);
    gap: 0.5rem;
  }

  .app-mobile-bar .app-mobile-title {
    flex: 1;
    font-weight: 600;
    font-size: 0.95rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .page-header {
    flex-direction: column;
    align-items: stretch;
  }

  .page-header-actions {
    width: 100%;
  }

  .page-header-actions .btn {
    flex: 1;
    min-width: calc(50% - 0.25rem);
  }

  .filter-panel .filter-row label {
    min-width: calc(50% - 0.35rem);
    flex: 1 1 calc(50% - 0.35rem);
  }

  .table-wrap {
    -webkit-overflow-scrolling: touch;
    max-height: min(70vh, 640px);
  }

  .table-wrap table {
    font-size: 0.86rem;
  }

  .table-wrap td,
  .table-wrap th {
    padding: 0.65rem 0.45rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .login-shell {
    padding: max(1rem, env(safe-area-inset-top)) 1rem max(1.5rem, env(safe-area-inset-bottom));
  }

  /* Bottom tab navigation */
  .mobile-tab-bar {
    display: flex;
    position: fixed;
    inset-inline: 0;
    bottom: 0;
    z-index: 45;
    min-height: var(--mobile-tab-height);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border-subtle);
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.35);
  }

  .mobile-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    min-height: var(--touch-min);
    padding: 0.35rem 0.25rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.68rem;
    font-weight: 500;
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-tab svg {
    width: 22px;
    height: 22px;
    opacity: 0.85;
  }

  .mobile-tab.is-active {
    color: #dbeafe;
    background: var(--color-primary-muted);
  }

  .mobile-tab:active {
    background: var(--color-surface-hover);
  }

  button.mobile-tab {
    border: 0;
    background: transparent;
    font-family: inherit;
    cursor: pointer;
    width: auto;
  }

  body.messenger-has-chat .mobile-tab-bar,
  body.hide-nav .mobile-tab-bar {
    display: none;
  }

  /* PWA install strip */
  .pwa-install-bar {
    display: none;
    position: fixed;
    inset-inline: 0.75rem;
    bottom: calc(var(--mobile-tab-total) + 0.5rem);
    z-index: 46;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    align-items: center;
    gap: 0.65rem;
    flex-wrap: wrap;
  }

  .pwa-install-bar.is-visible {
    display: flex;
  }

  body.messenger-has-chat .pwa-install-bar {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 0.75rem);
  }

  body.hide-nav .pwa-install-bar {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 0.75rem);
  }

  .pwa-install-text {
    flex: 1;
    min-width: 140px;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin: 0;
  }

  .pwa-install-text strong {
    display: block;
    color: var(--color-text);
    font-size: 0.9rem;
  }

  /* Messenger master–detail */
  body.messenger-page .messenger-escape {
    display: none;
  }

  body.messenger-page .messenger-layout {
    flex: 1;
    min-height: 0;
  }

  body.messenger-page .messenger-sidebar {
    flex: 1 1 auto;
    width: 100%;
    max-width: none;
    min-width: 0;
  }

  body.messenger-has-chat .messenger-sidebar {
    display: none !important;
  }

  body.messenger-has-chat .messenger-main {
    flex: 1;
    min-height: 0;
  }

  .mobile-chat-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0;
    flex-shrink: 0;
    border-bottom: 1px solid var(--color-border-subtle);
    margin-bottom: 0.5rem;
  }

  .mobile-chat-title {
    flex: 1;
    font-weight: 600;
    font-size: 1rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .chat-info-collapsible {
    margin-bottom: 0.5rem;
  }

  body.messenger-has-chat .chat-info-panel .chat-info-head {
    display: none;
  }

  .chat-info-details summary {
    cursor: pointer;
    font-weight: 600;
    padding: 0.35rem 0;
    list-style: none;
    color: var(--color-text-muted);
  }

  .chat-info-details summary::-webkit-details-marker {
    display: none;
  }

  body.messenger-has-chat .chat-viewport {
    flex: 1;
    min-height: 0;
    height: auto;
    border-radius: var(--radius-lg);
  }

  body.messenger-page .conv-list li a {
    min-height: var(--touch-min);
    padding: 0.75rem 0.5rem;
  }

  body.messenger-page .conv-peer-name,
  body.messenger-page .conv-display-name {
    display: none;
  }
}

@media (min-width: 901px) {
  .mobile-tab-bar,
  .pwa-install-bar,
  .mobile-chat-bar {
    display: none !important;
  }

  .chat-info-details summary {
    display: none;
  }

  .chat-info-details .info-grid {
    display: grid;
  }
}