@layer components {

  /* Conversation list */
  /* Auto margins in the main pane's flex column size the list to its
     content, which an unwrappable preview widens past the viewport; a
     definite inline size holds it to the pane. */
  .chat-list {
    padding: var(--block-space) var(--inline-space);
    inline-size: 100%;
    max-inline-size: var(--editor-max-width);
    margin-inline: auto;
  }

  .chat-list__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-block-end: var(--block-space);
  }

  .chat-list__title {
    font-family: var(--font-prose);
    font-size: var(--text-large);
    font-weight: 500;
  }

  /* Ruled rows, not cards. */
  .chat-list__items {
    border-block-end: var(--border);
    display: flex;
    flex-direction: column;
  }

  .chat-list__item {
    display: flex;
    flex-direction: column;
    padding-block: calc(var(--block-space) * 0.75);
    border-block-start: var(--border);
    text-decoration: none;
    color: var(--color-ink);
    transition: background-color var(--transition-fast);
  }

  .chat-list__item:hover {
    background-color: var(--color-surface);
  }

  .chat-list__item-title {
    font-family: var(--font-prose);
    font-weight: 500;
  }

  .chat-list__item-meta {
    font-size: var(--text-xs);
    font-variant-numeric: tabular-nums;
    color: var(--color-ink-muted);
    margin-block-start: 0.25rem;
  }

  .chat-list__item-preview {
    font-family: var(--font-prose);
    font-size: var(--text-small);
    color: var(--color-ink-secondary);
    margin-block-start: 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .chat-list__trash-link {
    display: inline-flex;
    align-items: center;
    min-block-size: var(--touch-target-min);
    margin-block-start: var(--block-space);
    color: var(--color-ink-secondary);
    font-size: var(--text-small);
    transition: color var(--transition-fast);
  }

  @media (hover: hover) {
    .chat-list__trash-link:hover {
      color: var(--color-ink);
    }
  }

  /* The Trash: each chat with Restore and Delete. Its title sits beside
     the back arrow rather than across the header from it. */
  .chat-list__header:has(> .chat__back) {
    justify-content: flex-start;
    gap: var(--inline-space-half);
  }

  .chat-trash__note {
    margin-block: 0 var(--block-space);
    color: var(--color-ink-secondary);
    font-size: var(--text-small);
  }

  /* A chat in the Trash opens nowhere, so its card does not light up as a link. */
  .chat-trash__item:hover {
    border-color: oklch(var(--lch-ink-lighter));
  }

  .chat-trash__actions {
    display: flex;
    gap: var(--inline-space-half);
    margin-block-start: var(--block-space-half);
  }

  @media (max-width: 799px), (pointer: coarse) {
    .chat-list__trash-link {
      min-block-size: 44px;
    }
  }

  /* New chat's Roleplay choices, shown above the composer once Roleplay is on. */
  .chat-new__roleplay {
    display: flex;
    flex-direction: column;
    gap: var(--block-space-half);
    padding-block-end: var(--block-space-half);
  }

  .chat-new__roleplay[hidden] {
    display: none;
  }

  .chat-new__roleplay-empty {
    margin: 0;
    color: var(--color-ink-secondary);
    font-size: var(--text-small);
  }

  /* ============================================================
     Chat Sidebar -- the Chats list beside the chat, shown once the main
     pane has room for both (chat.css lays them out)
     ============================================================ */

  .chat-sidebar {
    --sidebar-width: 16rem;

    inline-size: var(--sidebar-width);
    flex-shrink: 0;
    border-inline-end: var(--border);
    display: none;
    flex-direction: column;
    max-block-size: calc(100dvh - var(--nav-height));
    overflow: hidden;
  }

  @container main (min-width: 44rem) {
    .chat-sidebar {
      display: flex;
    }
  }

  .chat-sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--block-space-half) var(--inline-space) var(--block-space-half) var(--inline-space-double);
    border-block-end: var(--border);
    flex-shrink: 0;
  }

  .chat-sidebar__title {
    font-family: var(--font-prose);
    font-weight: 500;
    font-size: var(--text-normal);
  }

  /* Send is the chat's one filled button, so New chat beside it is outlined. */
  .chat-sidebar__header .btn--primary {
    --btn-bg: var(--color-canvas);
    --btn-border-color: oklch(var(--lch-ink-light));
    --btn-color: var(--color-ink);
  }

  .chat-sidebar__header .btn--primary:hover {
    --btn-border-color: oklch(var(--lch-ink-medium));
  }

  .chat-sidebar__list {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .chat-sidebar__empty {
    color: var(--color-ink-muted);
    font-size: var(--text-small);
    padding: var(--block-space-half) var(--inline-space) var(--block-space-half) var(--inline-space-double);
  }

  .chat-sidebar__item {
    display: flex;
    flex-direction: column;
    padding: var(--block-space-half) var(--inline-space) var(--block-space-half) calc(var(--inline-space-double) - var(--sidebar-active-border));
    text-decoration: none;
    color: var(--color-ink);
    border-block-end: var(--border);
    --sidebar-active-border: 2px;
    border-inline-start: var(--sidebar-active-border) solid transparent;
    transition: background-color var(--transition-fast);
  }

  .chat-sidebar__item:hover {
    background-color: var(--color-surface);
  }

  .chat-sidebar__item[aria-current="page"] {
    border-inline-start: var(--sidebar-active-border) solid var(--color-accent);
  }

  .chat-sidebar__item-title {
    font-family: var(--font-prose);
    font-weight: 500;
    font-size: var(--text-small);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .chat-sidebar__item-meta {
    font-size: var(--text-xs);
    font-variant-numeric: tabular-nums;
    text-wrap: balance;
    color: var(--color-ink-muted);
    margin-block-start: var(--block-space-eighth);
  }
}