/* Conversation surfaces favour reading rhythm and clear, quiet affordances. */
.chat-room {
  background: var(--shell-surface);
}
.chat-room.chat-panel-resizing,
.chat-room.chat-panel-resizing * {
  cursor: col-resize !important;
  user-select: none;
}
.chat-main {
  position: relative;
  min-width: 0;
  container-type: inline-size;
}
.chat-header {
  display: flex;
  min-height: 76px;
  align-items: center;
  gap: 12px;
  /* 13px（而不是 14px）：标题块 48 + 上下留白 26 + 底部 1px 线恰好 75，由
     min-height 收到 76，与右侧面板头的 76 精确对齐。 */
  padding: 13px 24px;
  border-bottom: 1px solid var(--shell-hairline);
  background: color-mix(in srgb, var(--shell-surface) 94%, var(--shell-field));
}
/* 纯字形：无底色无边框，`#` 用主墨色（浅色主题下渲染为黑色）。38px 的占位
   保持与两行标题的垂直对齐。 */
.chat-channel-icon {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 12px;
  color: var(--shell-ink);
  background: transparent;
}
.chat-heading {
  min-width: 0;
  flex: 1;
}
.chat-topic {
  margin-top: 2px;
  overflow: hidden;
  color: var(--shell-ink-muted);
  font-size: 12px;
  line-height: 1.5;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chat-header-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 4px;
}
.chat-header-actions > button,
.chat-panel-close {
  display: inline-grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 10px;
  color: var(--shell-ink-muted);
  transition:
    color 160ms,
    background 160ms;
}
.chat-header-actions > button:hover,
.chat-panel-close:hover {
  color: var(--shell-ink);
  background: var(--shell-active);
}
.chat-action-label {
  display: none;
}
.chat-message-list {
  padding: 8px 12px 16px;
  scroll-padding-block: 20px;
}
.chat-history-start {
  margin: 20px 8px 8px;
  color: var(--shell-ink-muted);
  font-size: 12px;
  text-align: center;
}
.chat-day-divider {
  margin-top: 10px;
  color: var(--shell-ink-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.chat-message-row {
  margin: 1px 0;
  border-radius: 10px;
}
.chat-message-row:hover {
  background: color-mix(in srgb, var(--shell-field) 72%, transparent);
}
.chat-message-row.chat-message-grouped {
  min-height: 24px;
}
.chat-message-body {
  max-width: 820px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}
.chat-message-toolbar {
  position: absolute;
  z-index: 20; /* above the jump-to-latest pill, so its popover is never buried */
  right: 10px;
  top: -15px;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--shell-hairline);
  border-radius: 10px;
  background: var(--shell-surface);
  box-shadow: var(--shell-shadow);
  opacity: 0;
  pointer-events: none; /* hidden, but it still covered the row above and ate its clicks */
  /*
   * Fade only. A `transform` here would make the toolbar the containing block
   * for the reaction picker and the more-menu, which are `position: fixed`
   * children placed with viewport coordinates — they would fly off-screen and
   * the buttons would look dead.
   */
  transition: opacity 150ms;
}
.chat-message-row:hover .chat-message-toolbar,
.chat-message-toolbar:focus-within,
.chat-message-toolbar:has([aria-pressed="true"]) {
  opacity: 1;
  pointer-events: auto;
}
/* Square icon buttons are the toolbar's own actions, never the popovers it hosts. */
.chat-message-toolbar > button,
.chat-message-toolbar > div > button {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 7px;
  color: var(--shell-ink-muted);
}
.chat-message-toolbar > button:hover,
.chat-message-toolbar > div > button:hover {
  color: var(--shell-ink);
  background: var(--shell-field);
}
.chat-unread-marker {
  margin: 8px 0;
}
.chat-transcript-notice {
  min-height: 280px;
}
.chat-notice-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid var(--shell-hairline);
  border-radius: 16px;
  color: var(--shell-ink-muted);
  background: var(--shell-field);
}
.chat-notice-title {
  font-size: 18px;
  font-weight: 600;
}
.chat-notice-description {
  max-width: 360px;
  color: var(--shell-ink-muted);
  font-size: 14px;
  line-height: 1.7;
}
.chat-composer-band {
  flex: 0 0 auto;
  padding: 12px 20px 18px;
  border-top: 1px solid var(--shell-hairline);
  background: var(--shell-surface);
}
.chat-composer {
  overflow: hidden;
  border: 1px solid var(--shell-hairline);
  border-radius: 14px;
  background: var(--shell-field);
  box-shadow: 0 2px 8px rgb(24 28 31 / 3%);
}
.chat-composer:focus-within {
  border-color: var(--shell-tile);
}
.chat-composer-input {
  display: flex;
  min-height: 46px;
  padding: 5px 12px 0;
}
.chat-composer-toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 42px;
  padding: 4px 8px 8px;
}
.chat-composer-tool {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 9px;
  color: var(--shell-ink-muted);
  transition:
    background 160ms,
    color 160ms;
}
.chat-composer-tool:hover {
  color: var(--shell-ink);
  background: var(--shell-active);
}
.chat-composer-help {
  display: flex;
  gap: 12px;
  margin-left: 6px;
  color: var(--shell-ink-muted);
  font-size: 11px;
}
.chat-composer-help kbd {
  padding: 1px 4px;
  border: 1px solid var(--shell-hairline);
  border-radius: 4px;
  background: var(--shell-surface);
  font-family: inherit;
}
.chat-send-button {
  display: inline-flex;
  min-width: 70px;
  height: 34px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-left: auto;
  padding: 0 11px;
  border-radius: 9px;
  color: white;
  background: var(--shell-action);
  font-size: 12px;
  font-weight: 600;
  transition:
    filter 160ms,
    transform 160ms;
}
.chat-send-button:hover:not(:disabled) {
  filter: brightness(1.08);
}
.chat-send-button:active:not(:disabled) {
  transform: scale(0.97);
}
.chat-send-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}
.chat-side-panel {
  position: relative;
  width: min(var(--chat-panel-width, 380px), calc(100% - 100px));
  max-width: calc(100% - 100px);
  box-shadow: -10px 0 24px rgb(24 28 31 / 3%);
}
.chat-panel-resize-handle {
  position: absolute;
  z-index: 30;
  top: 0;
  bottom: 0;
  left: -6px;
  width: 12px;
  cursor: col-resize;
  touch-action: none;
  outline: none;
}
.chat-panel-resize-handle::after {
  position: absolute;
  top: 50%;
  left: 5px;
  width: 2px;
  height: 44px;
  border-radius: 999px;
  background: var(--shell-focus);
  content: "";
  opacity: 0;
  transform: translateY(-50%);
  transition: opacity 150ms;
}
.chat-panel-resize-handle:hover::after,
.chat-panel-resize-handle:focus-visible::after,
.chat-panel-resizing .chat-panel-resize-handle::after {
  opacity: 1;
}
.chat-panel-focus-scrim {
  position: absolute;
  z-index: 25;
  inset: 0;
  background: color-mix(in srgb, var(--shell-surface) 38%, transparent);
  backdrop-filter: blur(8px) saturate(0.86);
  -webkit-backdrop-filter: blur(8px) saturate(0.86);
}
.chat-panel-header {
  min-height: 76px;
  padding: 0 16px;
}
.chat-panel-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 40px 24px;
  text-align: center;
}
.chat-panel-empty-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 15px;
  color: var(--shell-ink-muted);
  background: var(--shell-field);
}
.chat-popover {
  box-shadow: 0 14px 40px rgb(24 28 31 / 16%);
}
.chat-popover button {
  cursor: pointer;
}

/* The picker ships its own palette; re-point its variables at the shell tokens
 * so search, category tabs and hover states read as part of the same surface. */
.chat-emoji-picker .EmojiPickerReact {
  --epr-bg-color: var(--shell-surface);
  --epr-picker-border-color: var(--shell-hairline);
  --epr-picker-border-radius: 10px;
  --epr-text-color: var(--shell-ink-muted);
  --epr-search-input-bg-color: var(--shell-field);
  --epr-search-input-bg-color-active: var(--shell-field);
  --epr-search-border-color: var(--shell-hairline);
  --epr-search-border-color-active: var(--shell-focus);
  --epr-hover-bg-color: var(--shell-active);
  --epr-focus-bg-color: var(--shell-active);
  --epr-category-label-bg-color: color-mix(in srgb, var(--shell-surface) 90%, transparent);
  --epr-category-icon-active-color: var(--shell-action);
  --epr-category-icon-inactive-color: var(--shell-ink-muted);
}
/* The dark theme re-points every variable at an --epr-dark-* twin, so the
 * tokens have to be overridden there instead. */
.chat-emoji-picker .epr-dark-theme {
  --epr-dark-bg-color: var(--shell-surface);
  --epr-dark-picker-border-color: var(--shell-hairline);
  --epr-dark-text-color: var(--shell-ink-muted);
  --epr-dark-search-input-bg-color: var(--shell-field);
  --epr-dark-search-input-bg-color-active: var(--shell-field);
  --epr-dark-hover-bg-color: var(--shell-active);
  --epr-dark-focus-bg-color: var(--shell-active);
  --epr-dark-category-label-bg-color: color-mix(in srgb, var(--shell-surface) 90%, transparent);
  --epr-dark-category-icon-active-color: var(--shell-ink);
  --epr-dark-category-icon-inactive-color: var(--shell-ink-muted);
}
.chat-emoji-picker .epr-main * {
  font-family: inherit;
}
/* The picker scrolls its own body, so the popover must not clip it. */
.chat-popover:has(.chat-emoji-picker) {
  padding: 4px;
}

/* A reader can intentionally leave the chat column very narrow while widening
 * a detail pane. Keep the header compact and horizontal at every width rather
 * than allowing its title and topic to wrap into an unusable column. */
@container (max-width: 480px) {
  .chat-main > .chat-header {
    min-height: 60px;
    padding: 10px 12px;
    gap: 8px;
  }
  .chat-main .chat-topic {
    display: none;
  }
  .chat-main .chat-header-actions {
    gap: 0;
  }
  .chat-main .chat-header-actions > button {
    width: 32px;
    height: 32px;
  }
  .chat-main .chat-header-actions > button:nth-child(n + 4) {
    display: none;
  }
}
@container (max-width: 300px) {
  .chat-main .chat-heading {
    display: none;
  }
  .chat-main .chat-header-actions > button:nth-child(n + 3) {
    display: none;
  }
}
@container (max-width: 180px) {
  .chat-main .chat-header-actions {
    display: none;
  }
}

.chat-panel-scrim {
  display: none;
}
@media (max-width: 1200px) {
  .chat-panel-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 24;
    background: rgb(18 20 22 / 40%);
  }
  .chat-side-panel {
    position: fixed;
    z-index: 25;
    right: 0;
    top: 0;
    bottom: 0;
    width: min(380px, 88vw);
    max-width: none;
    box-shadow: -18px 0 48px rgb(24 28 31 / 18%);
  }
  .chat-panel-resize-handle,
  .chat-panel-focus-scrim {
    display: none;
  }
}
@media (max-width: 760px) {
  .chat-header {
    min-height: 68px;
    padding: 12px 16px;
  }
  .chat-panel-header {
    min-height: 68px;
  }
  .chat-channel-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
  }
  .chat-header-actions {
    gap: 1px;
  }
  .chat-header-actions > button {
    width: 32px;
    height: 32px;
  }
  .chat-message-list {
    padding: 6px 8px 12px;
  }
  .chat-message-row {
    gap: 10px;
    padding-left: 8px;
    padding-right: 8px;
  }
  .chat-message-toolbar {
    right: 8px;
    opacity: 1;
    pointer-events: auto;
  }
  .chat-message-toolbar > :nth-child(n + 4) {
    display: none;
  }
  .chat-composer-band {
    padding: 10px 12px 12px;
  }
  .chat-composer-help {
    display: none;
  }
  .chat-side-panel {
    width: 100%;
  }
}
@media (max-width: 420px) {
  .chat-header {
    gap: 8px;
    padding: 10px 12px;
  }
  .chat-header-actions > button {
    width: 30px;
    height: 30px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .chat-message-toolbar,
  .chat-send-button {
    transition: none;
  }
}