/* STRIDE shell + Conversations (AJ approved 2026-09-24; prototype
   conv-proto/proto.html, map in IMPLEMENTATION.md). Loads LAST.

   1. One floating glass sidebar on every destination (#toolRail): mark,
      Home · Meetings · Conversations · Drive, search (⌘K), then the
      conversation list re-parented from #chatTool (Pinned · Channels ·
      Groups · Scout). 280 wide, 8 inset, radius sheet; folds to a 72 rail.
      data-sb on #appShell: open | rail | overlay (641–1023) | phone.
   2. Conversations runs edge to edge: no topbar, a slim glass header over
      the timeline, a centered 760 reading column, the composer floating at
      the bottom, the thread pane a floating glass panel on the right.
   Tokens only. Ember is earned (unread, mention, New, focus). */

/* ======================================================================
   0. Local roles (tokens only)
   ====================================================================== */
#appShell {
  --sb-gutter: 8px;
  --sb-width: 280px;
  --sb-rail: 72px;
  --pane-width: 400px;
  --conv-measure: 760px;
  --st-hover: color-mix(in srgb, var(--text-1) 6%, transparent);
  --st-press: color-mix(in srgb, var(--text-1) 10%, transparent);
  --st-inset: var(--stride-color-surface-inset);
  --st-selected: var(--stride-color-selection);
}
html:not([data-theme="dark"]) #appShell { --st-selected: var(--stride-color-surface-inset); }

/* ======================================================================
   1. The sidebar (≥ 641)
   ====================================================================== */
@media (min-width: 641px) {
  #appShell.is-authed[data-sb] {
    --rail-width: calc(var(--sb-width) + var(--sb-gutter) * 2);
    padding-left: var(--rail-width);
  }
  #appShell.is-authed[data-sb="rail"] { --rail-width: calc(var(--sb-rail) + var(--sb-gutter) * 2); }
  #appShell.is-authed[data-sb="overlay"] { --rail-width: 0px; }
  #appShell.is-authed.is-in-room[data-tool="room"][data-sb="rail"] { --rail-width: calc(var(--sb-rail) + var(--sb-gutter) * 2); }
  #appShell.is-authed.is-in-room[data-tool="room"][data-sb="overlay"] { --rail-width: 0px; }

  html #appShell.is-authed[data-sb] .tool-rail {
    inset: var(--sb-gutter) auto var(--sb-gutter) var(--sb-gutter);
    width: var(--sb-width);
    height: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0;
    border: 0;
    border-radius: var(--stride-radius-sheet);
    background: var(--chrome-glass);
    -webkit-backdrop-filter: var(--chrome-glass-filter);
    backdrop-filter: var(--chrome-glass-filter);
    box-shadow: none;
    overflow: hidden;
    transition: width var(--dur-slow) var(--ease-spring-sheet), transform var(--dur-slow) var(--ease-spring-sheet), visibility 0s;
  }
  html #appShell.is-authed[data-sb] .tool-rail::after { display: none; }
  html #appShell.is-authed[data-sb="rail"] .tool-rail { width: var(--sb-rail); }

  /* top row: the wordmark (org chooser) + the collapse button */
  html #appShell.is-authed[data-sb] .tool-rail > .topbar__organization {
    width: auto;
    height: 64px;
    min-height: 64px;
    margin: 0;
    padding: 0 100px 0 20px;
    border-radius: 0;
    justify-content: flex-start;
  }
  html #appShell.is-authed[data-sb] .tool-rail > .topbar__organization .topbar__wordmark {
    display: inline-block;
    width: 100px;
    height: 26px;
  }
  html #appShell.is-authed[data-sb] .tool-rail > .topbar__organization-menu { left: 12px; top: 60px; }
  .stride-sidebar__collapse,
  .stride-sidebar__open {
    position: relative;
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    flex: none;
    padding: 0;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    color: var(--text-2);
    transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  }
  .stride-sidebar__collapse::before,
  .stride-sidebar__open::before { content: ""; position: absolute; inset: -4px; }
  .stride-sidebar__collapse:active,
  .stride-sidebar__open:active { transform: scale(0.92); background: var(--st-press); }
  .stride-sidebar__collapse:focus-visible,
  .stride-sidebar__open:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }
  #appShell.is-authed[data-sb] .stride-sidebar__collapse { position: absolute; top: 14px; right: 12px; z-index: 2; }
  .stride-sidebar__open { display: none; }

  /* destinations */
  html #appShell.is-authed[data-sb] .pd1-primary-nav {
    align-items: stretch;
    gap: 2px;
    width: auto;
    padding: 4px 8px 8px;
  }
  html #appShell.is-authed[data-sb] .pd1-primary-nav__item {
    width: 100%;
    height: 40px;
    min-height: 40px;
    justify-content: flex-start;
    gap: 12px;
    padding: 0 12px;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    color: var(--text-2);
    font: 500 16px/1 var(--font-sans);
    white-space: nowrap;
  }
  html #appShell.is-authed[data-sb] .pd1-primary-nav__item > svg:not(.pd1-primary-nav__disclosure) { width: 22px; height: 22px; stroke-width: 1.75; }
  html #appShell.is-authed[data-sb] .pd1-primary-nav__item > span {
    display: inline;
    font: inherit;
    letter-spacing: 0;
    color: inherit;
  }
  @media (hover: hover) {
    html #appShell.is-authed[data-sb] .pd1-primary-nav__item:hover { background: var(--st-hover); color: var(--text-1); }
  }
  html #appShell.is-authed[data-sb] .pd1-primary-nav__item:active { transform: scale(0.98); }
  html #appShell.is-authed[data-sb] .pd1-primary-nav__item[aria-current="page"] {
    background: var(--selected-glass);
    color: var(--text-1);
    font-weight: 600;
    box-shadow: none;
  }
  html #appShell.is-authed[data-sb] .pd1-primary-nav__item[aria-current="page"] > svg { stroke-width: 2; }

  /* search: an icon button in the header beside the collapse toggle (⌘K) */
  .stride-sidebar__search {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    flex: none;
    padding: 0;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    color: var(--text-2);
    transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  }
  .stride-sidebar__search::before { content: ""; position: absolute; inset: -4px; }
  @media (hover: hover) { .stride-sidebar__search:hover { background: var(--st-hover); color: var(--text-1); } }
  .stride-sidebar__search:active { transform: scale(0.92); background: var(--st-press); }
  .stride-sidebar__search:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }
  .stride-sidebar__search svg { width: 20px; height: 20px; }
  .stride-sidebar__search-label,
  .stride-sidebar__search-kbd { display: none; }
  #appShell.is-authed[data-sb] .stride-sidebar__search { position: absolute; top: 14px; right: 52px; z-index: 2; }

  /* the list region scrolls; the account row stays pinned */
  .stride-sidebar__list {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
  }
  html #appShell.is-authed[data-sb] .tool-rail > .tool-rail__spacer { display: none; }
  .stride-sidebar__list > .chat-threads {
    flex: 1 1 auto;
    min-height: 0;
    width: auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0 8px 12px;
    border: 0;
    background: transparent;
    overflow-x: hidden;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--st-selected) transparent;
    -webkit-mask-image: linear-gradient(#000 calc(100% - 24px), transparent);
    mask-image: linear-gradient(#000 calc(100% - 24px), transparent);
  }
  .stride-sidebar__list .workspace-conversations-title,
  .stride-sidebar__list .chat-threads__caption,
  .stride-sidebar__list #chatScoutPolicyCaption { display: none; }

  /* section heads: label 12/500 text3, the + appears on hover/focus */
  .stride-sidebar__list .chat-threads__section-head {
    display: flex;
    align-items: center;
    height: 32px;
    min-height: 32px;
    margin: 8px 0 0;
    padding: 12px 4px 0 12px;
    box-sizing: content-box;
  }
  .stride-sidebar__list .chat-threads__label {
    font: 500 12px/1 var(--font-sans);
    letter-spacing: .02em;
    text-transform: none;
    color: var(--text-3);
  }
  .stride-sidebar__list .chat-threads__new {
    margin-left: auto;
    width: 28px;
    min-width: 28px;
    height: 28px;
    min-height: 28px;
    display: inline-grid;
    place-items: center;
    padding: 0;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    color: var(--text-2);
    opacity: 0;
    transition: opacity var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
  }
  .stride-sidebar__list .chat-threads__section-head:hover .chat-threads__new,
  .stride-sidebar__list .chat-threads__new:focus-visible,
  .stride-sidebar__list .chat-threads__new[aria-expanded="true"] { opacity: 1; }
  @media (hover: none) { .stride-sidebar__list .chat-threads__new { opacity: 1; } }
  .stride-sidebar__list .chat-threads__new:hover { background: var(--st-hover); color: var(--text-1); }
  .stride-sidebar__list .chat-channels-empty { margin: 0; padding: 6px 12px; font: 400 14px/1.4 var(--font-sans); color: var(--text-3); }
  .stride-sidebar__list .chat-agent-threads { display: flex; flex-direction: column; gap: 0; }
  .stride-sidebar__list .chat-threads__pinned:empty { display: none; }
  .stride-sidebar__list .chat-threads__pinned { margin-bottom: 0; }

  /* rows: single line, 40 tall, 16/400; lead 24; unread 600 + dot / badge */
  .stride-sidebar__list .chat-thread-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    height: 40px;
    min-height: 40px;
    margin: 0;
    padding: 0 12px 0 8px;
    border: 0;
    border-radius: var(--stride-radius-surface);
    background: transparent;
    box-shadow: none;
    color: var(--text-2);
    font: 400 16px/1 var(--font-sans);
    text-align: left;
    white-space: nowrap;
    cursor: pointer;
    transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  }
  .stride-sidebar__list .chat-thread-item[hidden],
  .stride-sidebar__list .chat-thread-item.chat-thread-item--hidden { display: none; }
  @media (hover: hover) { .stride-sidebar__list .chat-thread-item:hover { background: var(--st-hover); color: var(--text-1); } }
  .stride-sidebar__list .chat-thread-item:active { transform: scale(0.98); }
  .stride-sidebar__list .chat-thread-item:focus-visible { outline: 2px solid var(--ring); outline-offset: -2px; }
  .stride-sidebar__list .chat-thread-item[aria-pressed="true"],
  .stride-sidebar__list .chat-thread-item[aria-current="true"] {
    background: var(--selected-glass);
    color: var(--text-1);
    font-weight: 600;
  }
  .stride-sidebar__list .chat-thread-item.is-unread { color: var(--text-1); font-weight: 600; }
  /* a conversation reads selected only while Conversations shows it */
  #appShell:not([data-tool="chat"]) .stride-sidebar__list .chat-thread-item:is([aria-pressed="true"], [aria-current="true"]):not(.is-unread) {
    background: transparent;
    color: var(--text-2);
    font-weight: 400;
  }
  #appShell:not([data-tool="chat"]) .stride-sidebar__list .chat-thread-item:is([aria-pressed="true"], [aria-current="true"]):not(.is-unread) .chat-thread-item__icon:not(.chat-thread-item__icon--org) { color: var(--text-3); }
  @media (hover: hover) { #appShell:not([data-tool="chat"]) .stride-sidebar__list .chat-thread-item[aria-pressed="true"]:hover { background: var(--st-hover); color: var(--text-1); } }
  .stride-sidebar__list .chat-thread-item__icon {
    position: relative;
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    flex: none;
    margin: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--text-3);
  }
  .stride-sidebar__list .chat-thread-item__icon svg { width: 18px; height: 18px; }
  .stride-sidebar__list .chat-thread-item.is-unread .chat-thread-item__icon,
  .stride-sidebar__list .chat-thread-item[aria-pressed="true"] .chat-thread-item__icon { color: var(--text-1); }
  .stride-sidebar__list .chat-thread-item__icon--org { border-radius: var(--stride-radius-control); background: var(--st-inset); color: var(--text-1); }
  .stride-sidebar__list .chat-thread-item__icon--org svg { width: 14px; height: 14px; }
  /* group: a two-face diagonal pair */
  .stride-sidebar__list .chat-thread-item__cluster { position: relative; display: block; width: 24px; height: 24px; }
  .stride-sidebar__list .chat-thread-item__cluster > * {
    position: absolute;
    display: grid;
    place-items: center;
    width: 18px;
    height: 18px;
    margin: 0;
    border-radius: 50%;
    background: var(--st-selected);
    color: var(--text-2);
    font: 600 9px/1 var(--font-sans);
    overflow: hidden;
    box-shadow: 0 0 0 2px var(--stride-color-surface);
  }
  .stride-sidebar__list .chat-thread-item__cluster > :first-child { top: 0; left: 0; }
  .stride-sidebar__list .chat-thread-item__cluster > :nth-child(2) { right: 0; bottom: 0; }
  .stride-sidebar__list .chat-thread-item__cluster > :only-child { inset: 0; width: 24px; height: 24px; font-size: 11px; }
  .stride-sidebar__list .chat-thread-item__cluster > :nth-child(n+3) { display: none; }
  .stride-sidebar__list .chat-thread-item__cluster img { width: 100%; height: 100%; object-fit: cover; }
  .stride-sidebar__list .chat-thread-item__body { display: flex; align-items: center; flex: 1; min-width: 0; gap: 8px; }
  .stride-sidebar__list .chat-thread-item__row { display: flex; align-items: center; flex: 1; min-width: 0; gap: 8px; }
  .stride-sidebar__list .chat-thread-item__title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font: inherit;
    color: inherit;
    letter-spacing: 0;
  }
  /* previews live in the thread (and the rail tooltip) on the web */
  .stride-sidebar__list .chat-thread-item__preview { display: none; }
  .stride-sidebar__list .chat-thread-item__line2 { display: contents; }
  .stride-sidebar__list .chat-thread-item__time { font: 500 12px/1 var(--font-sans); letter-spacing: .02em; color: var(--text-3); flex: none; }
  /* only Scout rows keep their time */
  .stride-sidebar__list :is(#chatChannelThreads, #chatGroupThreads, #chatPinnedThreads) .chat-thread-item__time { display: none; }
  .stride-sidebar__list .chat-thread-item__unread-dot {
    width: 8px;
    height: 8px;
    min-width: 8px;
    flex: none;
    margin: 0 0 0 auto;
    border-radius: 50%;
    background: var(--signal);
    box-shadow: none;
  }
  .stride-sidebar__list .chat-thread-item__unread-dot.is-count {
    width: auto;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: var(--stride-radius-pill);
    background: var(--unread);
    color: var(--on-unread);
    font: 600 12px/18px var(--font-sans);
    text-align: center;
    font-variant-numeric: tabular-nums;
  }
  .stride-sidebar__list .chat-thread-item__archive {
    position: absolute;
    right: 6px;
    top: 50%;
    width: 28px;
    height: 28px;
    margin: 0;
    transform: translateY(-50%);
    display: inline-grid;
    place-items: center;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: var(--stride-color-surface);
    color: var(--text-2);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-fast) var(--ease);
  }
  .stride-sidebar__list .chat-thread-item:hover .chat-thread-item__archive,
  .stride-sidebar__list .chat-thread-item__archive:focus-visible { opacity: 1; pointer-events: auto; }
  .stride-sidebar__list .chat-thread-item__work-timer { flex: none; margin-left: auto; }
  .stride-sidebar__list .chat-channel-create,
  .stride-sidebar__list .chat-group-create { margin: 4px 4px 8px; }
  .stride-sidebar__list .chat-search-results { margin: 0 0 8px; }

  /* footer: account + bell, one axis */
  html #appShell.is-authed[data-sb] .tool-rail__utilities {
    flex-direction: row;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 12px 12px 12px 12px;
    border-top: 0;
  }
  html #appShell.is-authed[data-sb] .tool-rail__account { flex: 1; min-width: 0; width: auto; height: auto; }
  html #appShell.is-authed[data-sb] .tool-rail__account-button {
    width: 100%;
    min-width: 0;
    height: 48px;
    min-height: 48px;
    justify-content: flex-start;
    gap: 12px;
    padding: 0 8px 0 4px;
    border-radius: var(--stride-radius-pill);
  }
  html #appShell.is-authed[data-sb] .tool-rail__account-button .topbar__avatar { width: 32px; height: 32px; }
  html #appShell.is-authed[data-sb] .tool-rail__account-text { display: grid; gap: 2px; min-width: 0; text-align: left; }
  html #appShell.is-authed[data-sb] .tool-rail__account-text-name { font: 600 14px/1.2 var(--font-sans); color: var(--text-1); }
  html #appShell.is-authed[data-sb] .tool-rail__account-text-org { font: 400 12px/1.2 var(--font-sans); color: var(--text-3); }
  html #appShell.is-authed[data-sb] .tool-rail__utilities > #notificationBell {
    position: relative;
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    flex: none;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    color: var(--text-2);
  }
  html #appShell.is-authed[data-sb] .tool-rail__utilities > #notificationBell:hover { background: var(--st-hover); color: var(--text-1); }
  html #appShell.is-authed[data-sb] .tool-rail__utilities > #notificationBell svg { width: 20px; height: 20px; }
  html #appShell.is-authed[data-sb] .tool-rail__utilities > #notificationBell .notification-bell__unread { position: absolute; top: 2px; right: 0; }

  /* the topbar never repeats the sidebar: no search pill, no bell, no rule */
  html #appShell.is-authed[data-sb] .topbar {
    background: var(--bg-app);
    border-bottom: 0;
    box-shadow: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  html #appShell.is-authed[data-sb] .topbar #globalSearch { display: none; }
  html #appShell.is-authed[data-sb] .topbar { background: transparent; }
  /* Conversations runs edge to edge: no topbar at all */
  #appShell.is-authed[data-sb][data-tool="chat"] { --shell-topbar-height: 0px; }
  html #appShell.is-authed[data-sb][data-tool="chat"] .topbar { display: none; }

  /* ---------- the 72 rail ---------- */
  html #appShell.is-authed[data-sb="rail"] .tool-rail > .topbar__organization {
    height: 64px;
    padding: 0;
    justify-content: center;
  }
  html #appShell.is-authed[data-sb="rail"] .tool-rail > .topbar__organization .topbar__wordmark { display: none; }
  html #appShell.is-authed[data-sb="rail"] .tool-rail > .topbar__organization .topbar__mark::before { margin-right: 0; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__collapse { position: relative; top: auto; right: auto; margin: 0 auto 4px; }
  html #appShell.is-authed[data-sb="rail"] .pd1-primary-nav { padding: 4px 12px 8px; }
  html #appShell.is-authed[data-sb="rail"] .pd1-primary-nav__item { width: 48px; height: 44px; padding: 0; justify-content: center; }
  html #appShell.is-authed[data-sb="rail"] .pd1-primary-nav__item > span,
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__time,
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__archive,
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-channel-create,
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-channels-empty,
  html #appShell.is-authed[data-sb="rail"] .tool-rail__account-text { display: none; }
  html #appShell.is-authed[data-sb="rail"] .tool-rail__utilities { flex-direction: column-reverse; gap: 4px; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__search { position: relative; top: auto; right: auto; margin: 0 auto 8px; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list > .chat-threads { padding: 0 12px 12px; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-threads__section-head { display: block; height: 1px; min-height: 0; margin: 8px; padding: 0; background: color-mix(in srgb, var(--text-1) 8%, transparent); }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-threads__section-head > * { display: none; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item { width: 48px; height: 44px; min-height: 44px; padding: 0; gap: 0; justify-content: center; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__body {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
  }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__icon { width: 28px; height: 28px; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__cluster { width: 28px; height: 28px; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__cluster > * { width: 20px; height: 20px; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__unread-dot {
    position: absolute;
    top: 6px;
    right: 6px;
    margin: 0;
    box-shadow: 0 0 0 2px var(--stride-color-surface);
    clip: auto;
  }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__body:has(.chat-thread-item__unread-dot) { clip: auto; clip-path: none; overflow: visible; position: static; flex: none; width: 0; height: 0; }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__body:has(.chat-thread-item__unread-dot) .chat-thread-item__title { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  html #appShell.is-authed[data-sb="rail"] .stride-sidebar__list .chat-thread-item__unread-dot.is-count { top: 2px; right: 0; }
  html #appShell.is-authed[data-sb="rail"] .tool-rail__utilities { justify-content: center; padding: 12px 0; }
  html #appShell.is-authed[data-sb="rail"] .tool-rail__account { flex: none; }
  html #appShell.is-authed[data-sb="rail"] .tool-rail__account-button { width: 48px; justify-content: center; padding: 0; }

  /* ---------- 641–1023: the sidebar is an overlay ---------- */
  html #appShell.is-authed[data-sb="overlay"] .tool-rail {
    z-index: 120;
    transform: translateX(calc(-100% - 24px));
    visibility: hidden;
    box-shadow: var(--shadow-3);
    transition: transform var(--dur-slow) var(--ease-spring-sheet), visibility 0s linear var(--dur-slow);
  }
  html #appShell.is-authed[data-sb="overlay"][data-sb-open="1"] .tool-rail {
    transform: none;
    visibility: visible;
    transition: transform var(--dur-slow) var(--ease-spring-sheet), visibility 0s;
  }
  #appShell.is-authed[data-sb="overlay"] .stride-sidebar__open { display: inline-grid; }
  .stride-sidebar__scrim {
    position: fixed;
    inset: 0;
    z-index: 119;
    background: var(--scrim);
    opacity: 1;
    animation: stride-shell-fade var(--dur-med) var(--ease) both;
  }
  .stride-sidebar__scrim[hidden] { display: none; }
  #appShell:not([data-sb="overlay"]) .stride-sidebar__scrim { display: none; }
}

@keyframes stride-shell-fade { from { opacity: 0; } }

/* the rail tooltip (T2 float, lives on <body>) */
.stride-rail-tip {
  position: fixed;
  z-index: 400;
  transform: translateY(-50%);
  padding: 6px 10px;
  border-radius: var(--stride-radius-control);
  background: var(--popover-glass-fill);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  backdrop-filter: blur(24px) saturate(1.4);
  box-shadow: var(--popover-shadow);
  color: var(--text-1);
  font: 500 12px/16px var(--font-sans);
  white-space: nowrap;
  pointer-events: none;
  animation: stride-shell-fade var(--dur-fast) var(--ease) both;
}
.stride-rail-tip[hidden] { display: none; }
@keyframes stride-shell-breathe { 0%, 100% { opacity: 0; } 50% { opacity: 1; } }
@keyframes stride-shell-blink { 50% { opacity: 0; } }

/* ======================================================================
   2. Conversations (≥ 641): edge to edge
   ====================================================================== */
@media (min-width: 641px) {
  html #appShell.is-authed[data-sb][data-tool="chat"] .workspace { padding: 0; }
  /* the timeline is the only scroller on Conversations: the document never
     scrolls (a stray pixel of page scroll moved the reader's anchor) */
  html #appShell.is-authed[data-sb][data-tool="chat"] { height: 100dvh; min-height: 0; max-height: 100dvh; overflow: clip; }
  html #appShell.is-authed[data-sb][data-tool="chat"] .workspace { overflow: clip; }
  html #appShell.is-authed[data-sb] #chatTool {
    --desktop-chat-measure: var(--conv-measure);
    position: relative;
    height: 100dvh;
    max-height: 100dvh;
    border: 0;
    border-radius: 0;
    background: var(--bg-app);
    overflow: hidden;
  }
  html #appShell.is-authed[data-sb] #chatTool > .chat-workspace-resizer { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .chat-conversation {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: 64px minmax(0, 1fr) repeat(9, auto);
    flex: 1 1 auto;
    min-width: 0;
    min-height: 0;
    height: 100%;
    background: var(--bg-app);
    container: conv / inline-size;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-conversation > * { grid-column: 1; min-width: 0; }
  html #appShell.is-authed[data-sb] #chatTool .chat-conversation > .scout-private-caption { display: none; }

  /* header: slim, on the canvas, fading into the timeline */
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head {
    grid-row: 1;
    position: relative;
    z-index: 4;
    display: flex;
    align-items: center;
    gap: 12px;
    height: 64px;
    min-height: 64px;
    margin: 0;
    padding: 0 16px 0 24px;
    border: 0;
    background: var(--bg-app);
    box-shadow: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head::after {
    content: "";
    position: absolute;
    inset: 100% 0 auto;
    height: 24px;
    background: linear-gradient(var(--bg-app), transparent);
    pointer-events: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__back { display: none; }
  html #appShell.is-authed[data-sb="overlay"] #chatTool .chat-convo-head { padding-left: 12px; }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__titles {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
    flex: 0 1 auto;
    min-width: 0;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__title {
    font: 600 17px/1.35 var(--font-sans);
    letter-spacing: -0.005em;
    color: var(--text-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__meta {
    display: block;
    margin: 0;
    font: 500 12px/1 var(--font-sans);
    letter-spacing: .02em;
    color: var(--text-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__meta:empty,
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__meta[hidden] { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-context { display: none; }
  /* rename + bell: quiet, beside the title (the right edge keeps three controls) */
  html #appShell.is-authed[data-sb] #chatTool :is(.chat-convo-head__rename, #chatConvoNotifyOpen) {
    width: 28px;
    height: 28px;
    min-width: 28px;
    min-height: 28px;
    padding: 0;
    display: inline-grid;
    place-items: center;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    color: var(--text-3);
    box-shadow: none;
    opacity: 0;
    transition: opacity var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
  }
  html #appShell.is-authed[data-sb] #chatTool #chatConvoNotifyOpen[data-muted="true"],
  html #appShell.is-authed[data-sb] #chatTool #chatConvoNotifyOpen[aria-expanded="true"],
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head:hover :is(.chat-convo-head__rename, #chatConvoNotifyOpen),
  html #appShell.is-authed[data-sb] #chatTool :is(.chat-convo-head__rename, #chatConvoNotifyOpen):focus-visible { opacity: 1; }
  @media (hover: none) { html #appShell.is-authed[data-sb] #chatTool :is(.chat-convo-head__rename, #chatConvoNotifyOpen) { opacity: 1; } }
  html #appShell.is-authed[data-sb] #chatTool :is(.chat-convo-head__rename, #chatConvoNotifyOpen):hover { background: var(--st-hover); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool #chatConvoNotify[hidden] + .chat-convo-head__faces,
  /* face stack: 24, −6 overlap, 2px knock-out in the canvas */
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__faces,
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__tool--faces {
    display: inline-flex;
    align-items: center;
    height: 36px;
    padding: 0 8px 0 10px;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__faces[hidden] { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__tool--faces:hover { background: var(--st-hover); }
  /* Call + Ask Scout: secondary pills (filled, never outlined) */
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 36px;
    min-height: 36px;
    padding: 0 16px 0 12px;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: var(--st-inset);
    color: var(--text-1);
    font: 500 14px/1 var(--font-sans);
    white-space: nowrap;
    box-shadow: none;
    flex: none;
    transition: background-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill[hidden] { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill,
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__faces,
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-popwrap { margin: 0; }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__spacer { flex: 1 1 auto; min-width: 0; }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill svg { width: 18px; height: 18px; flex: none; }
  @media (hover: hover) { html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill:hover { background: color-mix(in srgb, var(--st-inset), var(--text-1) 8%); } }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill:active { transform: scale(0.98); }
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head__pill:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }

  /* ---------- the timeline: centered 760 reading column ---------- */
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThread {
    grid-row: 1 / -1;
    position: relative;
    z-index: auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    min-height: 0;
    height: auto;
    margin: 0;
    padding: 72px max(24px, calc((100% - var(--conv-measure)) / 2)) calc(var(--conv-dock-h, 96px) + 40px);
    overflow-x: hidden;
    overflow-y: auto;
    scroll-padding-top: 80px;
    scrollbar-width: thin;
    scrollbar-color: var(--st-selected) transparent;
    background: transparent;
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThread > * { width: 100%; max-width: var(--conv-measure); margin-inline: auto; box-sizing: border-box; }

  /* the day: a small sticky glass capsule that rides the header centre */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-daybreak {
    position: sticky;
    top: -52px;
    z-index: 5;
    display: flex;
    justify-content: center;
    margin: 24px auto 12px;
    padding: 0;
    border: 0;
    pointer-events: none;
    background: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-daybreak::before,
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-daybreak::after { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-daybreak__label {
    height: 24px;
    padding: 0 12px;
    border-radius: var(--stride-radius-pill);
    font: 500 12px/24px var(--font-sans);
    letter-spacing: .02em;
    text-transform: none;
    color: var(--text-2);
    background: var(--chrome-glass);
    -webkit-backdrop-filter: var(--chrome-glass-filter);
    backdrop-filter: var(--chrome-glass-filter);
    /* stuck day capsules share the header centre; the newest one paints on
       top and these canvas wings hide any wider, older capsule beneath it */
    box-shadow: -48px 0 0 0 var(--bg-app), 48px 0 0 0 var(--bg-app);
  }
  @container conv (max-width: 900px) {
    #chatTool .scout-chat-daybreak { position: relative !important; top: 0 !important; }
  }

  /* messages: 32 avatar gutter, 14/600 name, 16/1.5 body; 2 within a
     group, 20 between groups */
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThread > .scout-chat-msg { margin: 20px 0 0; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThread > .scout-chat-msg.is-followup { margin-top: 2px; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg:is(.scout-chat-msg--peer, .scout-chat-msg--scout, .scout-chat-msg--error) {
    position: relative;
    display: block;
    padding: 2px 8px 2px 52px;
    margin-inline: -8px;
    width: calc(100% + 16px);
    max-width: calc(var(--conv-measure) + 16px);
    border-radius: var(--stride-radius-surface);
    transition: background-color var(--dur-fast) var(--ease);
  }
  @media (hover: hover) {
    html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg:is(.scout-chat-msg--peer, .scout-chat-msg--scout):hover { background: color-mix(in srgb, var(--text-1) 3%, transparent); }
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg:is(.scout-chat-msg--peer, .scout-chat-msg--scout, .scout-chat-msg--error) .scout-chat-msg__stack {
    position: static;
    max-width: 100%;
    width: 100%;
    align-items: flex-start;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg__idrow {
    display: flex;
    align-items: baseline;
    gap: 8px;
    height: 20px;
    margin: 0 0 2px;
    padding: 0;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg.is-followup .scout-chat-msg__idrow { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg__idbadge {
    position: absolute;
    left: 8px;
    top: 4px;
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    margin: 0;
    border-radius: 50%;
    background: var(--st-selected);
    color: var(--text-2);
    font: 600 12px/1 var(--font-sans);
    overflow: hidden;
    border: 0;
    box-shadow: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg__idbadge img { width: 100%; height: 100%; object-fit: cover; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout .scout-chat-msg__idbadge { background: var(--st-inset); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout .scout-chat-msg__idbadge svg { width: 16px; height: 16px; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg__idname { font: 600 14px/20px var(--font-sans); letter-spacing: 0; color: var(--text-1); text-transform: none; }
  html #appShell.is-authed[data-sb] #chatTool :is(.scout-chat-msg__idtime, .scout-chat-msg__idmodel) { font: 500 12px/1 var(--font-sans); letter-spacing: .02em; color: var(--text-3); opacity: 1; }
  /* grouped rows: the time rides the avatar gutter on hover */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg.is-followup:is(.scout-chat-msg--peer, .scout-chat-msg--scout)[data-time]::before {
    content: attr(data-time);
    position: absolute;
    left: 0;
    top: 8px;
    width: 44px;
    text-align: center;
    font: 500 11px/1 var(--font-sans);
    letter-spacing: .02em;
    color: var(--text-3);
    opacity: 0;
    transition: opacity var(--dur-fast) var(--ease);
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg.is-followup:hover::before { opacity: 1; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg:is(.scout-chat-msg--peer, .scout-chat-msg--scout, .scout-chat-msg--error) .scout-chat-text {
    padding: 0;
    margin: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    color: var(--text-1);
    font: 400 16px/1.5 var(--font-sans);
    max-width: 100%;
  }

  /* Scout streaming: a breathing signal glow behind the mark, a "Writing"
     status pill beside the name and a 2×16 caret at the end of the text */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout[data-streaming="true"] .scout-chat-msg__idbadge { overflow: visible; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout[data-streaming="true"] .scout-chat-msg__idbadge::after {
    content: "";
    position: absolute;
    inset: -4px;
    z-index: -1;
    border-radius: 50%;
    background: radial-gradient(closest-side, color-mix(in srgb, var(--signal) 22%, transparent), transparent);
    animation: stride-shell-breathe 2.4s ease-in-out infinite;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout[data-streaming="true"] .scout-chat-msg__idrow::after {
    content: "Writing";
    order: 3;
    height: 20px;
    padding: 0 8px;
    border-radius: var(--stride-radius-pill);
    background: var(--st-inset);
    color: var(--text-2);
    font: 500 12px/20px var(--font-sans);
    letter-spacing: .02em;
    align-self: center;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout[data-streaming="true"] .scout-chat-text::after {
    content: "";
    display: inline-block;
    width: 2px;
    height: 16px;
    margin-left: 2px;
    vertical-align: -2px;
    background: var(--text-1);
    animation: stride-shell-blink 1s steps(1) infinite;
  }
  /* thinking: the Scout mark + a status pill, in the reading column */
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThinking:not([hidden]) {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    margin: 20px 0 0;
    padding: 0 0 0 44px;
    border: 0;
    background: none;
    color: var(--text-2);
    font: 500 12px/1 var(--font-sans);
    letter-spacing: .02em;
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThinking .scout-chat-thinking__flame {
    position: absolute;
    left: 0;
    top: 2px;
    box-sizing: border-box;
    width: 32px;
    height: 32px;
    padding: 8px;
    border-radius: 50%;
    background: var(--st-inset);
    color: var(--text-1);
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThinking #scoutChatThinkingText {
    height: 20px;
    padding: 0 8px;
    border-radius: var(--stride-radius-pill);
    background: var(--st-inset);
    line-height: 20px;
    text-transform: none;
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatThinking #scoutChatThinkingText::first-letter { text-transform: uppercase; }

  /* own: right-aligned neutral bubble, tighter 8 corner where it groups */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    padding: 0;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user .scout-chat-msg__stack {
    align-items: flex-end;
    max-width: min(72ch, 82%);
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user .scout-chat-text {
    padding: 10px 14px;
    border: 0;
    border-radius: var(--stride-radius-sheet);
    background: var(--bubble-own);
    color: var(--on-bubble-own);
    font: 400 16px/1.5 var(--font-sans);
    box-shadow: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user:has(+ .scout-chat-msg--user.is-followup) .scout-chat-text { border-bottom-right-radius: var(--stride-radius-control); }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user.is-followup .scout-chat-text { border-top-right-radius: var(--stride-radius-control); }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user .scout-chat-msg__meta { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user:hover .scout-chat-msg__meta { display: none; }

  /* "New": the one ember rule */
  html #appShell.is-authed[data-sb] #chatTool :is(.desktop-chat-unread, .chat-unread-divider, .scout-chat-unread) {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0 8px;
    padding: 0;
    border: 0;
    background: none;
    font: 600 12px/1 var(--font-sans);
    letter-spacing: .02em;
    text-transform: none;
    color: var(--stride-color-brand-text);
  }

  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-unread::before,
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-unread::after {
    content: "";
    display: block;
    flex: 1;
    height: 1px;
    background: color-mix(in srgb, var(--signal) 40%, transparent);
  }

  /* reactions: 28 inset pills; yours on the Selected fill */
  html #appShell.is-authed[data-sb] #chatTool .reaction-pill {
    height: 28px;
    min-height: 28px;
    padding: 0 8px;
    gap: 6px;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: var(--st-inset);
    color: var(--text-2);
    font: 600 12px/1 var(--font-sans);
    box-shadow: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .reaction-pill[aria-pressed="true"] {
    background: var(--st-selected);
    color: var(--text-1);
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--text-1) 14%, transparent);
  }
  html:not([data-theme="dark"]) #appShell.is-authed[data-sb] #chatTool .reaction-pill[aria-pressed="true"] { background: color-mix(in srgb, var(--st-inset), var(--text-1) 9%); box-shadow: none; }
  html #appShell.is-authed[data-sb] #chatTool .reaction-pill__emoji { font-size: 16px; line-height: 1; }

  /* the thread entry: faces + "3 replies" + age, a ghost pill on hover */
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: auto;
    max-width: 100%;
    height: 32px;
    margin: 6px 0 0 -8px;
    padding: 0 12px 0 8px;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: transparent;
    box-shadow: none;
    color: var(--text-1);
    transition: background-color var(--dur-fast) var(--ease);
  }
  @media (hover: hover) { html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary:hover { background: var(--st-inset); } }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary[aria-expanded="true"] { background: var(--st-selected); }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary__avatars { display: inline-flex; padding-left: 5px; }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary__avatar {
    display: grid;
    place-items: center;
    width: 20px;
    height: 20px;
    margin-left: -5px;
    border: 0;
    border-radius: 50%;
    background: var(--st-selected);
    color: var(--text-2);
    font: 600 9px/1 var(--font-sans);
    overflow: hidden;
    box-shadow: 0 0 0 2px var(--bg-app);
  }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary__count { font: 600 14px/1 var(--font-sans); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary__latest { font: 500 12px/1 var(--font-sans); letter-spacing: .02em; color: var(--text-3); }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary__chevron { color: var(--text-3); opacity: 0; transform: translateX(-4px); transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease); }
  html #appShell.is-authed[data-sb] #chatTool .desktop-chat-thread-summary:hover .desktop-chat-thread-summary__chevron { opacity: 1; transform: none; }

  /* hover actions: one floating T2 strip, top-right −18 (fine pointers;
     coarse-pointer web keeps the in-flow, always-visible 40 controls) */
  @media (hover: hover) and (pointer: fine) {
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions {
    position: absolute;
    top: -18px;
    right: 8px;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 2px;
    height: 36px;
    padding: 2px;
    border: 0;
    border-radius: var(--stride-radius-pill);
    background: var(--popover-glass-fill);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    backdrop-filter: blur(24px) saturate(1.4);
    box-shadow: var(--popover-shadow);
    opacity: 0;
    transform: translateY(4px) scale(.96);
    transform-origin: right bottom;
    transition: opacity var(--dur-fast) var(--ease), transform var(--dur-med) var(--ease);
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg:hover .desktop-chat-actions,
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions:focus-within,
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions:has([aria-expanded="true"]) {
    opacity: 1;
    transform: none;
    pointer-events: auto;
    transition-delay: 50ms;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions button {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    padding: 0;
    display: inline-grid;
    place-items: center;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-2);
    font-size: 18px;
    line-height: 1;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions button:hover { background: var(--st-hover); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-quick-reaction:nth-child(n+5) { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions__divider { width: 1px; height: 16px; margin: 0 2px; background: color-mix(in srgb, var(--text-1) 12%, transparent); }
  /* own messages: the strip sits left of the bubble, vertically centred */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user { position: relative; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user .desktop-chat-actions {
    top: 50%;
    right: calc(100% + 8px);
    transform: translateY(-50%) scale(.96);
    transform-origin: right center;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user .scout-chat-msg__stack { position: relative; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user:hover .desktop-chat-actions { transform: translateY(-50%); }

  }

  /* typing: in flow, just above the composer */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-typing {
    grid-row: 8;
    z-index: 3;
    align-self: end;
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    max-width: calc(var(--conv-measure) + 16px);
    height: 24px;
    margin: 0 auto 8px;
    padding: 0 8px;
    border: 0;
    background: transparent;
    color: var(--text-3);
    font: 500 12px/1 var(--font-sans);
    letter-spacing: .02em;
  }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-typing[hidden] { display: none; }

  /* ---------- the composer dock: floating glass over the timeline ---------- */
  html #appShell.is-authed[data-sb] #chatTool .chat-conversation::after {
    content: "";
    grid-row: 3 / -1;
    grid-column: 1;
    align-self: end;
    z-index: 1;
    height: calc(var(--conv-dock-h, 96px) + 32px);
    margin-top: -32px;
    background: linear-gradient(transparent, var(--bg-app) 45%);
    pointer-events: none;
  }
  html #appShell.is-authed[data-sb] #chatTool :is(#scoutChatDestination, #scoutFollowUpTarget, #scoutChatPendingFiles, #scoutChatContextRefs, #chatWorkIndicator) {
    position: relative;
    z-index: 3;
    width: calc(100% - 48px);
    max-width: calc(var(--conv-measure) + 16px);
    margin-inline: auto;
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatDestination { grid-row: 3; }
  html #appShell.is-authed[data-sb] #chatTool #scoutFollowUpTarget { grid-row: 4; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatPendingFiles { grid-row: 5; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatContextRefs { grid-row: 6; }
  html #appShell.is-authed[data-sb] #chatTool #chatWorkIndicator { grid-row: 7; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatHint { grid-row: 10; position: relative; z-index: 3; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm {
    grid-row: 9;
    position: relative;
    z-index: 3;
    display: flex;
    align-items: flex-end;
    gap: 4px;
    width: calc(100% - 48px);
    max-width: calc(var(--conv-measure) + 16px);
    min-height: 52px;
    margin: 0 auto 20px;
    padding: 8px;
    border: 0;
    border-radius: 26px;
    background: color-mix(in srgb, var(--st-inset) 88%, transparent);
    -webkit-backdrop-filter: var(--chrome-glass-filter);
    backdrop-filter: var(--chrome-glass-filter);
    box-shadow: var(--shadow-1), 0 8px 24px color-mix(in srgb, var(--stride-color-shadow-color) 22%, transparent);
    outline: 0;
    transition: border-radius var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease);
  }
  html:not([data-theme="dark"]) #appShell.is-authed[data-sb] #chatTool #scoutChatForm { background: var(--chrome-glass); }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm.is-multi { border-radius: var(--stride-radius-sheet); }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm:focus-within {
    outline: 0;
    box-shadow: var(--shadow-1), 0 8px 24px color-mix(in srgb, var(--stride-color-shadow-color) 22%, transparent), inset 0 0 0 1px color-mix(in srgb, var(--text-1) 12%, transparent);
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm .scout-chat-input {
    flex: 1;
    min-width: 0;
    height: 36px;
    min-height: 36px;
    max-height: 204px;
    padding: 6px 4px;
    border: 0;
    background: transparent;
    color: var(--text-1);
    font: 400 16px/24px var(--font-sans);
    resize: none;
    outline: 0;
    box-shadow: none;
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm :is(.scout-chat-add, .stride-dictation-mic) {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    padding: 0;
    display: inline-grid;
    place-items: center;
    flex: none;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-2);
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm :is(.scout-chat-add, .stride-dictation-mic):hover { background: var(--st-hover); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm :is(#scoutChatAttach, #scoutChatDeliverables, #scoutChatGif) { display: none; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm .scout-chat-send {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    padding: 0;
    display: inline-grid;
    place-items: center;
    flex: none;
    border: 0;
    border-radius: 50%;
    background: var(--accent);
    color: var(--on-accent);
    transition: background-color var(--dur-fast) var(--ease), transform var(--dur-med) var(--ease-spring-pop);
  }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm .scout-chat-send:hover:not(:disabled) { background: var(--accent-hover); }
  /* send only exists while there is text; it swaps with the mic */
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm:not(.has-text):not(.scout-chat-form--has-files):not([data-dictation-state="recording"]) .scout-chat-send:not(.is-stop):not([data-state="stop"]):not([data-mode="stop"]) { display: none; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm.has-text .stride-dictation-mic { display: none; }
  /* while Scout streams the send seat is Stop: always shown, the mic steps aside */
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm:has(.scout-chat-send[data-mode="stop"]) .stride-dictation-mic { display: none; }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm.has-text .scout-chat-send { animation: stride-shell-pop 260ms var(--ease-spring-pop); }
  html #appShell.is-authed[data-sb] #chatTool #scoutChatHint { display: none; }

  /* ---------- empty conversation ---------- */
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-empty:not(:empty) {
    margin: auto;
    padding: 48px 24px;
    text-align: center;
  }

  /* ---------- the thread pane: a floating glass panel on the right ---------- */
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail {
    position: relative;
    flex: 0 0 var(--pane-width);
    width: var(--pane-width);
    min-width: 0;
    height: auto;
    max-height: calc(100% - var(--sb-gutter) * 2);
    align-self: stretch;
    margin: var(--sb-gutter);
    padding: 0;
    border: 0;
    border-radius: var(--stride-radius-sheet);
    background: var(--chrome-glass);
    -webkit-backdrop-filter: var(--chrome-glass-filter);
    backdrop-filter: var(--chrome-glass-filter);
    box-shadow: none;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: stride-shell-pane-in var(--dur-slow) var(--ease-spring-sheet) both;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail[hidden] { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__head {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 56px;
    min-height: 56px;
    padding: 0 8px 0 20px;
    border: 0;
    background: transparent;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__heading { display: flex; flex-direction: column; gap: 3px; flex: 1; min-width: 0; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__kicker { display: none; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__title { margin: 0; font: 600 17px/1.2 var(--font-sans); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__meta { margin: 0; font: 500 12px/1 var(--font-sans); letter-spacing: .02em; color: var(--text-3); }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__close {
    width: 36px;
    height: 36px;
    display: inline-grid;
    place-items: center;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-2);
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__close:hover { background: var(--st-hover); color: var(--text-1); }
  html #appShell.is-authed[data-sb] #chatTool :is(.chat-context-rail__parent, .chat-context-rail__body) { padding-inline: 20px; background: transparent; border: 0; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__body { flex: 1; min-height: 0; overflow-y: auto; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-reply { margin: 0 12px 12px; padding: 0; border: 0; background: transparent; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-reply__composer {
    display: flex;
    align-items: center;
    gap: 4px;
    min-height: 48px;
    padding: 6px 6px 6px 8px;
    border: 0;
    border-radius: 24px;
    background: var(--st-inset);
    box-shadow: none;
  }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-reply__composer:focus-within { outline: 0; box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--text-1) 12%, transparent); }
  html #appShell.is-authed[data-sb] #chatTool #chatContextReplyInput { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--text-1); font: 400 16px/1.5 var(--font-sans); outline: 0; resize: none; box-shadow: none; }
}

@keyframes stride-shell-pane-in { from { transform: translateX(24px); opacity: 0; } }
@keyframes stride-shell-pop { 0% { transform: scale(0); } 100% { transform: scale(1); } }

/* 641–1023: the thread pane overlays with a scrim */
@media (min-width: 641px) and (max-width: 1023px) {
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 118;
    width: min(var(--pane-width), calc(100vw - 16px));
    box-shadow: var(--shadow-3);
  }
  html #appShell.is-authed[data-sb][data-pane="open"] #chatTool::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 117;
    background: var(--scrim);
    animation: stride-shell-fade var(--dur-med) var(--ease) both;
  }
}

/* ======================================================================
   3. Reduced motion / transparency
   ====================================================================== */
@media (prefers-reduced-motion: reduce) {
  html #appShell.is-authed[data-sb] .tool-rail,
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail,
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions,
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm .scout-chat-send { transition-property: opacity, background-color, color; transition-duration: 120ms; animation: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg .desktop-chat-actions { transform: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--scout[data-streaming="true"] :is(.scout-chat-msg__idbadge, .scout-chat-text)::after { animation: none; }
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--user .desktop-chat-actions { transform: translateY(-50%); }
}
@media (prefers-reduced-transparency: reduce) {
  html #appShell.is-authed[data-sb] .tool-rail,
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail,
  html #appShell.is-authed[data-sb] #chatTool #scoutChatForm,
  html #appShell.is-authed[data-sb] #chatTool .scout-chat-daybreak__label { background: var(--stride-color-surface); -webkit-backdrop-filter: none; backdrop-filter: none; }
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  html #appShell.is-authed[data-sb] .tool-rail,
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail { background: var(--stride-color-surface); }
}

/* ======================================================================
   4. Empty conversation + ⌘K
   ====================================================================== */
#chatTool .scout-chat-empty__glyph {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: var(--stride-radius-sheet);
  background: var(--stride-color-surface-inset);
  color: var(--text-2);
}
#chatTool .scout-chat-empty__glyph svg { width: 28px; height: 28px; }
#chatTool .scout-chat-empty__line { margin: 8px auto 20px; max-width: 36ch; color: var(--text-2); font: 400 16px/1.5 var(--font-sans); }
#chatTool .scout-chat-empty__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
html #appShell.is-authed[data-sb] #chatTool .scout-chat-empty .scout-chat-empty__title { margin: 0; font: 600 22px/1.25 var(--font-sans); letter-spacing: -0.015em; color: var(--text-1); }

@media (min-width: 641px) {
  html #appShell.is-authed[data-sb] #globalSearchRail.global-search {
    top: 15vh;
    right: auto;
    left: 50%;
    width: min(640px, calc(100vw - 32px));
    max-height: min(560px, 70vh);
    margin-left: calc(min(640px, calc(100vw - 32px)) / -2);
    padding: 8px;
    border-radius: var(--stride-radius-sheet);
    box-shadow: var(--shadow-3), 0 0 0 100vmax color-mix(in srgb, var(--scrim) 50%, transparent);
    transform-origin: center top;
  }
  html #appShell.is-authed[data-sb] #globalSearchRail .global-search__field { min-height: 56px; padding: 0 12px; }
  html #appShell.is-authed[data-sb] #globalSearchRail .global-search__input { font: 400 17px/1 var(--font-sans); }
}

/* the header steps down with the thread's own width (pane open at 1024,
   narrow tablets): faces go first, then the pill labels */
@media (min-width: 641px) {
  html #appShell.is-authed[data-sb] #chatTool .chat-convo-head { flex-wrap: nowrap; }
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__head,
  html #appShell.is-authed[data-sb] #chatTool .chat-context-reply,
  html #appShell.is-authed[data-sb] #chatTool .chat-context-rail__parent { border: 0; box-shadow: none; }
  @container conv (max-width: 720px) {
    html #appShell.is-authed[data-sb] #chatTool .chat-convo-head .chat-convo-head__faces { display: none; }
    html #appShell.is-authed[data-sb] #chatTool .chat-convo-head .chat-convo-head__pill { width: 36px; padding: 0; justify-content: center; }
    html #appShell.is-authed[data-sb] #chatTool .chat-convo-head .chat-convo-head__pill-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  }
}


/* face stack (every width) */
.chat-convo-head__facestack { display: inline-flex; align-items: center; }
.chat-convo-head__face {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin-left: -6px;
  border-radius: 50%;
  background: var(--st-selected);
  color: var(--text-2);
  font: 600 10px/1 var(--font-sans);
  overflow: hidden;
  box-shadow: 0 0 0 2px var(--bg-app);
}
.chat-convo-head__face img { width: 100%; height: 100%; object-fit: cover; }
.chat-convo-head__face--more { background: var(--st-inset); font-size: 11px; }

/* the count badge on a conversation row (every width) */
.chat-thread-item__unread-dot.is-count {
  width: auto;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: var(--stride-radius-pill);
  background: var(--unread);
  color: var(--on-unread);
  font: 600 12px/18px var(--font-sans);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ======================================================================
   5. Phones (≤ 640): the list page + pushed thread; the tab bar stays
   ====================================================================== */
@media (max-width: 640px) {
  .stride-sidebar__collapse,
  .stride-sidebar__open,
  .stride-sidebar__search,
  .stride-sidebar__scrim,
  .stride-sidebar__list,
  .chat-convo-head__spacer { display: none !important; }
  /* list rows: single line, 52 tall at 17 */
  #chatTool .chat-threads .chat-thread-item { min-height: 52px; height: 52px; padding-block: 0; align-items: center; border-radius: var(--stride-radius-surface); }
  #chatTool .chat-threads .chat-thread-item__body { display: flex; align-items: center; gap: 8px; min-width: 0; flex: 1; }
  #chatTool .chat-threads .chat-thread-item__row { flex: 1; min-width: 0; }
  #chatTool .chat-threads .chat-thread-item__title { font: 400 17px/1.2 var(--font-sans); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  #chatTool .chat-threads .chat-thread-item.is-unread .chat-thread-item__title,
  #chatTool .chat-threads .chat-thread-item[aria-pressed="true"] .chat-thread-item__title { font-weight: 600; }
  #chatTool .chat-threads .chat-thread-item__preview { display: none; }
  #chatTool .chat-threads .chat-thread-item__line2 { display: contents; }
  #chatTool .chat-threads :is(#chatChannelThreads, #chatGroupThreads, #chatPinnedThreads) .chat-thread-item__time { display: none; }
  #chatTool .chat-threads .chat-thread-item__icon--org { border-radius: var(--stride-radius-control); background: var(--stride-color-surface-inset); color: var(--text-1); }
  #chatTool .chat-threads .chat-threads__pinned .chat-thread-item { height: 56px; }
  /* the thread header: back · title · icon-only Call and Scout */
  #chatTool .chat-convo-head .chat-convo-head__titles { display: flex; flex-direction: column; min-width: 0; flex: 1 1 auto; }
  #chatTool .chat-convo-head .chat-convo-head__meta,
  #chatTool .chat-convo-head .chat-convo-head__faces,
  #chatTool .chat-convo-head .desktop-chat-context { display: none; }
  html #appShell.is-authed #chatTool .chat-convo-head .chat-convo-head__pill {
    box-shadow: none;
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    min-width: 36px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-1);
    flex: none;
  }
  #chatTool .chat-convo-head .chat-convo-head__pill[hidden] { display: none; }
  #chatTool .chat-convo-head .chat-convo-head__pill svg { width: 20px; height: 20px; }
  #chatTool .chat-convo-head .chat-convo-head__pill-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
}

/* a portrait inside the sender mark always fills its disc (every width) */
.scout-chat-msg__idbadge img { display: block; width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.scout-chat-msg__idbadge:has(img) { overflow: hidden; padding: 0; }

@media (max-width: 640px) {
  /* tapping a row pushes the thread full screen: no topbar, no tab bar */
  #appShell.is-authed[data-tool="chat"]:has(#chatTool[data-chat-view="convo"]) .topbar { display: none; }
  #appShell.is-authed[data-tool="chat"]:has(#chatTool[data-chat-view="convo"]) .tool-rail {
    transform: translateY(140%);
    opacity: 0;
    pointer-events: none;
  }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] {
    position: fixed;
    inset: 0;
    z-index: 60;
    height: 100dvh;
    padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
    background: var(--bg-app);
    animation: stride-shell-push var(--dur-slow) var(--ease-spring-sheet) both;
  }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] .chat-conversation {
    margin: 0;
    border: 0;
    border-radius: 0;
    background: var(--bg-app);
    box-shadow: none;
  }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] .chat-convo-head {
    flex-wrap: nowrap;
    min-height: 56px;
    padding: 0 8px 0 12px;
    gap: 4px;
    border: 0;
    background: var(--bg-app);
    box-shadow: none;
  }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] .chat-convo-head__back {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border: 0;
    background: transparent;
    box-shadow: none;
  }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] .chat-convo-head__title { font: 600 17px/1.3 var(--font-sans); }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] :is(.chat-convo-head__rename, #chatConvoNotifyOpen) {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-2);
    box-shadow: none;
  }
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] #chatConvoNotify { order: 10; }
}
@keyframes stride-shell-push { from { transform: translateX(24%); opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  #appShell.is-authed[data-tool="chat"] #chatTool[data-chat-view="convo"] { animation: stride-shell-fade 120ms linear both; }
}

@media (max-width: 640px) {
  /* the composer: one pill — + · field · mic, send swaps in with text */
  html #appShell.is-authed #chatTool #scoutChatForm {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    min-height: 52px;
    margin: 8px 12px 12px;
    padding: 8px;
    border: 0;
    border-radius: 26px;
    background: color-mix(in srgb, var(--stride-color-surface-inset) 88%, transparent);
    -webkit-backdrop-filter: var(--chrome-glass-filter);
    backdrop-filter: var(--chrome-glass-filter);
    box-shadow: var(--shadow-1);
  }
  html:not([data-theme="dark"]) #appShell.is-authed #chatTool #scoutChatForm { background: var(--chrome-glass); }
  html #appShell.is-authed #chatTool #scoutChatForm.is-multi { border-radius: var(--stride-radius-sheet); }
  html #appShell.is-authed #chatTool #scoutChatForm .scout-chat-add { order: -1; }
  html #appShell.is-authed #chatTool #scoutChatForm .scout-chat-input { flex: 1; min-width: 0; min-height: 36px; padding: 6px 4px; font: 400 16px/24px var(--font-sans); background: transparent; border: 0; }
  html #appShell.is-authed #chatTool #scoutChatForm :is(.scout-chat-add, .stride-dictation-mic, .scout-chat-send) {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    padding: 0;
    display: inline-grid;
    place-items: center;
    flex: none;
    border: 0;
    border-radius: 50%;
    box-shadow: none;
    background: transparent;
    color: var(--text-2);
  }
  html #appShell.is-authed #chatTool #scoutChatForm .scout-chat-send { background: var(--accent); color: var(--on-accent); }
  html #appShell.is-authed #chatTool #scoutChatForm :is(#scoutChatAttach, #scoutChatDeliverables, #scoutChatGif) { display: none; }
  html #appShell.is-authed #chatTool #scoutChatForm:not(.has-text):not(.scout-chat-form--has-files):not([data-dictation-state="recording"]) .scout-chat-send:not([data-mode="stop"]) { display: none; }
  html #appShell.is-authed #chatTool #scoutChatForm.has-text .stride-dictation-mic { display: none; }
  html #appShell.is-authed #chatTool #scoutChatForm:has(.scout-chat-send[data-mode="stop"]) .stride-dictation-mic { display: none; }
}

/* a Scout turn that could not answer: one quiet line + Retry (every width) */
#chatTool .scout-chat-msg--failed .scout-chat-text,
html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--failed .scout-chat-text { color: var(--text-2); }
#chatTool .scout-chat-msg__retry {
  display: inline-flex;
  align-items: center;
  height: 28px;
  margin-left: 4px;
  padding: 0 12px;
  border: 0;
  border-radius: var(--stride-radius-pill);
  background: var(--stride-color-surface-inset);
  color: var(--text-1);
  font: 500 14px/1 var(--font-sans);
  vertical-align: 1px;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
#chatTool .scout-chat-msg__retry:hover { background: color-mix(in srgb, var(--stride-color-surface-inset), var(--text-1) 8%); }
#chatTool .scout-chat-msg__retry:active { transform: scale(0.98); }
#chatTool .scout-chat-msg__retry:focus-visible { outline: 2px solid var(--ring); outline-offset: 2px; }
#chatTool .scout-chat-msg__retry:disabled { opacity: .5; cursor: default; }
#chatTool .scout-chat-msg--failed .scout-chat-text,
html #appShell.is-authed[data-sb] #chatTool .scout-chat-msg--failed .scout-chat-text { display: flex; flex-flow: row wrap; align-items: center; gap: 8px; }
#chatTool .scout-chat-msg--failed .scout-chat-msg__retry { flex: none; width: auto; margin: 0; }


/* ======================================================================
   6. Home beside the sidebar
   ====================================================================== */
@media (min-width: 641px) {
  /* the greeting is the header: no "Home" page title (the bar returns only
     to carry the live-call pill) */
  html #appShell.is-authed[data-sb][data-tool="office"] .topbar:not(:has(#topbarLiveGroup:not([hidden]))) { display: none; }
  #appShell.is-authed[data-sb][data-tool="office"]:not(:has(#topbarLiveGroup:not([hidden]))) { --shell-topbar-height: 0px; }
}
/* Bonfire Chat on Home carries its last few lines, like iPad */
#homeChatDoor.has-lines { align-items: flex-start; flex-wrap: wrap; row-gap: 12px; }
#homeChatDoor .home-door__lines[hidden] { display: none; }
#homeChatDoor .home-door__lines {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1 0 100%;
  min-width: 0;
  padding: 12px 0 0;
  border-top: 1px solid color-mix(in srgb, var(--text-1) 8%, transparent);
}
#homeChatDoor .home-door__line {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font: 400 14px/1.45 var(--font-sans);
  color: var(--text-2);
  text-align: left;
}
#homeChatDoor .home-door__line strong { margin-right: 6px; font-weight: 600; color: var(--text-1); }
#homeChatDoor.has-lines .home-door__detail { display: none; }