/* Mobile owns a single viewport and flat, thumb-reachable surfaces.
   Keep this breakpoint synchronized with app.js isMobileLayout(). */
@media (max-width: 800px) {
  body.app-page { overscroll-behavior: none; }
  .app-page :is(button, a, [role="button"], input, textarea, select, .list-item) { touch-action: manipulation; }
  .app-page :is(.messages, #sidebarContent, .server-rail, .friends-page, .floating-menu) {
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }
  .app-page :is(.main, .sidebar, .server-rail, .mobile-tabbar, .floating-menu, .modal-bg, .lightbox, .call-bar, .voice-bar) {
    backdrop-filter: none; -webkit-backdrop-filter: none; box-shadow: none;
  }
  .app-page .app { --mob-banner: 0px; --mob-tabs: 0px; }
  .app-page .app.has-banner { --mob-banner: 40px; }
  .app-page .app.tab-screen { --mob-tabs: calc(var(--mobile-tab-h) + env(safe-area-inset-bottom)); }
  .app-page .app .main {
    top: calc(var(--mob-viewport-top, 0px) + var(--mob-banner));
    bottom: auto; overflow: clip;
    height: calc(var(--mob-viewport-height, 100dvh) - var(--mob-banner) - var(--mob-tabs));
    padding-top: env(safe-area-inset-top);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }
  .app.mob-back-dragging .main { transform: translateX(var(--mob-back-x, 0px)); transition: none; }
  .server-rail { padding-top: max(12px, env(safe-area-inset-top)); }
  .sidebar-search { padding-top: max(12px, env(safe-area-inset-top)); }
  .sidebar-search-btn { min-height: 44px; font-size: 13px; }
  .sidebar-home-heading { padding: 14px 8px 4px; }
  .sidebar-home-heading h2 { font-size: 23px; letter-spacing: -.5px; }
  .sidebar-home-heading .sidebar-compose { width: 44px; height: 44px; }
  /* Friends/Inbox already have tabs; discovery already has a rail button. */
  .home-navigation > :is(:nth-child(1), :nth-child(2), :nth-child(4)) { display: none; }
  .sidebar .home-navigation { padding-bottom: 0; }
  .sidebar .home-navigation .list-item { font-size: 13px; }
  .sidebar .list-item[data-chat-id] { min-height: 62px; padding: 8px; gap: 10px; }
  .sidebar .list-item .dm-av { width: 36px; height: 36px; min-width: 36px; font-size: 13px; }
  .sidebar .list-item .list-text { min-width: 0; }
  .sidebar .list-item .list-preview { margin-top: 4px; font-size: 12px; line-height: 1.4; color: var(--muted); }
  .sidebar .list-item .chan-menu-btn { width: 44px; min-width: 44px; height: 44px; min-height: 44px; opacity: 1; }
  .sidebar .list-item:hover, .voice-members .vmem.clickable:hover { transform: none; }
  .sidebar .unread-badge, .mobile-tab-badge { border-radius: 6px; }
  .mobile-tabbar { --mobile-tab-h: 62px; padding-top: 5px; background: var(--bg-2); }
  .app { --mobile-tab-h: 62px; }
  .mobile-tab { gap: 4px; font-size: 11px; border-radius: 8px; }
  .mobile-tab.active { background: var(--bg-4); color: var(--text-bright); font-weight: 650; }
  .mobile-tab.active::after { content: ''; position: absolute; top: 0; width: 22px; height: 2px; background: var(--accent); }
  .mobile-tab-badge { top: 1px; }
  .main > .conversation-header { min-height: 60px; padding: 6px 8px; gap: 4px; }
  .main > .conversation-header .lhs { min-width: 0; gap: 4px; }
  .main > .conversation-header .rhs { gap: 0; flex-shrink: 0; }
  .main > .conversation-header .title { font-size: 16px; }
  .conversation-header #inboxBtn { display: none; }
  .app.chat-open #sidebarToggle,
  .conversation-header .hd-actions .ghost.icon-btn,
  .main > .conversation-header > .rhs > .icon-btn { min-width: 44px; width: 44px; min-height: 44px; height: 44px; }
  #mainContent { min-height: 0; }
  #mainContent .messages { scrollbar-gutter: auto; padding-block: 12px; }
  /* Existing content-visibility is preserved; grouped rows need a better estimate. */
  #mainContent .messages > * { flex-shrink: 0; }
  #mainContent .msg.grouped { contain-intrinsic-size: auto 28px; }
  #mainContent .msg:is(:focus-within, .msg-swiping) { content-visibility: visible; }
  #mainContent .msg:hover { background: transparent; }
  #mainContent .msg .text :is(pre, code) { touch-action: pan-x pan-y; }
  #mainContent .composer, .stage-chat #mainContent .composer {
    flex: none; gap: 2px; padding: 4px; border-radius: 12px;
    margin: 0 8px calc(8px + env(safe-area-inset-bottom));
  }
  #mainContent .composer .ghost.icon-btn,
  #mainContent .composer button[type="submit"], .stage-chat #mainContent .composer button[type="submit"] {
    width: 44px; min-width: 44px; height: 44px; min-height: 44px; border-radius: 8px;
  }
  #mainContent .composer #msgInput { min-width: 0; min-height: 44px; font-size: 16px; }
  body.mob-keyboard #mainContent .composer { margin-bottom: 6px; }
  #mainContent .attach-preview .chip button, #mainContent .jump-bottom { min-height: 44px; }
  #mainContent .attach-preview .chip button { min-width: 44px; }
  #mainContent .attach-preview .reply-chip { flex-wrap: nowrap; }
  #mainContent .reply-chip-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  #mainContent .attach-preview { max-height: min(128px, 22dvh); }
  #mainContent .reaction-chip { min-height: 44px; min-width: 44px; border-radius: 8px; }
  .skeleton-msg { contain: layout paint; }
  .skeleton-msg .skeleton { background: var(--bg-3); animation: none; }
  .mob-chat-error { margin: auto; padding: 24px; max-width: 360px; color: var(--muted); line-height: 1.6; }
  .mob-chat-error button { min-height: 44px; margin-top: 12px; border-radius: 8px; }
  /* A real scrim replaces the huge spread shadow. CSS sizes sheets, so no
     anchor measurement or repositioning is needed during scroll. */
  .mob-sheet-scrim { position: fixed; inset: 0; background: rgb(0 0 0 / .45); z-index: 399; touch-action: none; }
  body.app-page .floating-menu.mob-sheet {
    left: max(8px, env(safe-area-inset-left)) !important;
    right: max(8px, env(safe-area-inset-right)) !important;
    top: auto !important;
    bottom: calc(var(--mob-viewport-bottom, 0px) + max(8px, env(safe-area-inset-bottom))) !important;
    width: auto; min-width: 0; max-width: none;
    max-height: calc(var(--mob-viewport-height, 100dvh) - 32px - env(safe-area-inset-top));
    padding: 0 8px 8px; border-radius: 12px; background: var(--bg-2); border: 1px solid var(--border-strong);
    box-shadow: none; overflow-y: auto; visibility: visible;
  }
  .floating-menu.mob-sheet :is(button, input) { min-height: 44px; }
  .floating-menu.mob-sheet button { box-shadow: none; border-radius: 8px; }
  .floating-menu.mob-sheet > .mob-sheet-handle {
    position: sticky; top: 0; z-index: 2; display: flex; justify-content: center; align-items: center;
    width: 100%; min-height: 44px; padding: 0; margin: 0; flex: none;
    border: 0; background: var(--bg-2); touch-action: none; grid-column: 1 / -1;
  }
  body.stage-open .mob-sheet-scrim { z-index: 6299; }
  .mob-sheet-handle::before { content: ''; width: 32px; height: 4px; border-radius: 4px; background: var(--muted); }
  .floating-menu.mob-sheet.emoji-picker-v2 { height: min(500px, calc(var(--mob-viewport-height, 100dvh) - 32px)); }
  .floating-menu.mob-sheet.emoji-picker.wide { grid-template-columns: repeat(7, minmax(0, 1fr)); }
  .floating-menu.mob-sheet.emoji-picker.wide .emoji { padding: 4px; min-width: 0; }
  .mob-haptic-setting { display: flex; align-items: center; gap: 16px; min-height: 64px; margin: 16px 0; }
  .mob-haptic-setting span { display: grid; gap: 4px; }
  .mob-haptic-setting small { color: var(--muted); line-height: 1.5; }
  .mob-haptic-setting input { width: 24px; height: 24px; flex: none; accent-color: var(--accent); }
  .lightbox .lightbox-img { touch-action: none; box-shadow: none; max-height: calc(var(--mob-viewport-height, 100dvh) - 160px); }
  .lightbox :is(.lightbox-close, .lightbox-prev, .lightbox-next, .lightbox-zoom button) { min-width: 44px; min-height: 44px; border-radius: 8px; }
  .lightbox .lightbox-close { top: max(12px, env(safe-area-inset-top)); right: max(12px, env(safe-area-inset-right)); }
  .lightbox .lightbox-zoom { bottom: calc(52px + env(safe-area-inset-bottom)); }
  .lightbox .lightbox-open { bottom: calc(16px + env(safe-area-inset-bottom)); }
  .lightbox .lightbox-caption { bottom: calc(108px + env(safe-area-inset-bottom)); margin-inline: auto; max-width: calc(100% - 32px); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .voice-bar { padding-bottom: env(safe-area-inset-bottom); }
  .voice-bar button, .mobile-call-controls .mcc-btn { min-height: 44px; min-width: 44px; }
  @media (prefers-reduced-motion: reduce) {
    .app-page :is(.main, .floating-menu, .lightbox-img, .skeleton) { animation: none !important; transition: none !important; }
  }
  body.reduce-motion :is(.main, .floating-menu, .lightbox-img, .skeleton) { animation: none !important; transition: none !important; }
}