/* Keep desktop toolbar semantics unchanged while grouping account controls for mobile. */
.account-session-controls {
  display: contents;
}

/*
 * Mobile chat is one viewport-sized app shell.
 * The landing page may scroll, but once chat is active the shell itself stays
 * pinned to Chrome's visible dynamic viewport. Only the messages pane scrolls;
 * the composer and collapsed online-users strip remain in their existing order.
 */
@media (max-width: 768px) {
  body.view-chat #chat-container {
    position: fixed;
    inset: 0;
    width: 100%;
    max-width: 100vw;
    min-height: 100dvh;
    height: 100dvh;
  }

  #chat-main {
    min-height: 0;
    overflow: hidden;
  }

  #chat-content {
    min-height: 0;
    overflow: hidden;
  }

  #messages {
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior-y: contain;
  }

  #user-sidebar:not(.is-expanded) #user-list,
  #user-sidebar:not(.is-expanded) #user-list-empty {
    display: none !important;
  }
}

/* Narrow portrait toolbar containment for phones such as the Huawei P30. */
@media (max-width: 600px) {
  #chat-container > header {
    --toolbar-padding-y: 6px;
    --toolbar-padding-x: 8px;
    --toolbar-logo-size: 30px;
    --toolbar-control-height: 34px;
    --toolbar-button-padding-y: 2px;
    --toolbar-button-padding-x: 6px;
    --toolbar-button-font-size: 0.85em;
    --toolbar-icon-button-size: 32px;
    --toolbar-search-gap: 4px;
    --toolbar-search-padding-y: 2px;
    --toolbar-search-padding-x: 4px;
    --toolbar-search-margin-left: 0px;
    --toolbar-search-font-size: 0.8em;
    --room-name-font-size: 0.95em;
    align-items: stretch;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 5px;
  }

  #chat-container header .header-left {
    width: 100%;
    max-width: 100%;
    gap: 6px;
  }

  #chat-container header .header-left #room-name {
    max-width: none;
  }

  #chat-container header .header-right {
    width: 100%;
    max-width: 100%;
    padding-left: 0;
    margin-left: 0;
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    align-items: center;
    gap: 4px;
    min-width: 0;
  }

  #chat-container .search-bar {
    grid-column: 1 / -1;
    margin-left: 0;
    width: 100%;
    min-width: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
  }

  #chat-container .search-bar input,
  #chat-container .search-bar select {
    width: 100%;
    min-width: 0;
  }

  #chat-container .header-right button {
    width: 100%;
    min-width: 0;
  }

  #chat-container .header-right #watch-party-btn .label,
  #chat-container .header-right #copy-join-link .label,
  #leave-btn .label {
    display: none;
  }

  .account-session-controls {
    grid-column: 1 / -1;
    grid-row: 3;
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
    max-width: 100%;
  }

  .account-session-controls[hidden] {
    display: none !important;
  }

  .account-identity {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #account-logout-btn {
    flex: 0 0 auto;
    width: auto;
    min-height: 44px;
    padding-inline: 12px;
  }

  #leave-btn {
    grid-column: 6;
    grid-row: 2;
  }

  .scroll-to-latest {
    left: auto;
    right: 12px;
    width: 44px;
    height: 44px;
    padding: 0;
    gap: 0;
    border-radius: 50%;
    justify-content: center;
    transform: none;
  }

  .scroll-to-latest::before {
    content: "↓";
    font-size: 22px;
    line-height: 1;
  }

  .scroll-to-latest .scroll-to-latest-label {
    display: none;
  }

  .scroll-to-latest .scroll-to-latest-count {
    position: absolute;
    top: -6px;
    right: -6px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 999px;
    box-sizing: border-box;
    font-size: 0.65rem;
    line-height: 18px;
  }

  .scroll-to-latest:hover {
    transform: translateY(-1px);
  }

  .scroll-to-latest:active {
    transform: none;
  }
}